Sensor, aerosol-generating device, and aerosol-forming article

Abstract

The present application relates to a sensor, an aerosol-generating device, and an aerosol-forming article. The sensor comprises: a first sensing part used for generating heat when penetrated by a varying magnetic field, so as to heat an aerosol-generating article, wherein the first sensing part has a first Curie temperature; a second sensing part connected to the first sensing part to sense the temperature of the first sensing part, wherein the second sensing part is configured such that there is a monotonic function relationship between the magnetic permeability thereof and the temperature thereof within the temperature range between a first temperature and a second temperature; and a third sensing part connected to the first sensing part to sense the temperature of the first sensing part, wherein the third sensing part has a third Curie temperature. The first Curie temperature is greater than the second temperature, and the third Curie temperature is greater than or equal to the first temperature and less than the second temperature.

Description

Receptor, aerosol generating device and aerosol forming article

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202410146477.4, filed with the Patent Office of China on February 1, 2024, entitled “Receptor, Aerosol Generating Device and Aerosol Forming Article,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present application relate to the field of aerosol generation technology, and in particular to a receptor, an aerosol generating device, and an aerosol-forming product. Background Art

[0004] Existing aerosol generating devices are used to generate aerosols from aerosol generating products such as cigarettes and cigars. An aerosol generating device or aerosol generating product includes an electromagnetic heating element, which includes a heating part and a temperature-sensing part. The heating part can generate heat in a changing magnetic field, thereby heating the aerosol generating product, and the Curie temperature of the heating part is greater than the Curie temperature of the temperature-sensing part. When the temperature-sensing part reaches its Curie temperature, the magnetic permeability of the temperature-sensing part will suddenly change. When the Curie temperature of the temperature-sensing part is reached, the power supply component in the aerosol generating device stops power output, thereby maintaining the temperature of the aerosol generating product heated by the electromagnetic heating element near the Curie temperature of the temperature-sensing part.

[0005] However, the heating of some aerosol-generating products includes a preheating stage and a puffing stage. The maximum temperature to be reached by the electromagnetic heating element in the preheating stage is different from the target temperature to be maintained by the electromagnetic heating element in the puffing stage. Therefore, the temperature of the electromagnetic heating element cannot be obtained when the temperature is lower than the Curie temperature of the temperature-sensing part and after the temperature is higher than the Curie temperature of the temperature-sensing part. As a result, the maximum temperature to be reached in the preheating stage and the target temperature to be maintained in the puffing stage cannot be monitored simultaneously, so that the electromagnetic heating element cannot meet the more complex heating requirements of aerosol-generating products.

[0006] Application Contents

[0007] The embodiments of the present application provide a susceptor, an aerosol generating device, and an aerosol-forming product, which can monitor the temperature of the susceptor after reaching the Curie temperature of the third sensing portion, and can meet the more complex heating requirements of the aerosol-forming product.

[0008] A sensor provided in an embodiment of the present application includes:

[0009] a first sensing portion for generating heat when penetrated by a varying magnetic field to heat the aerosol-generating article, the first sensing portion having a first Curie temperature;

[0010] a second sensing portion connected to the first sensing portion to sense the temperature of the first sensing portion, wherein the second sensing portion is configured to have a temperature range between the first temperature and the second temperature, and a monotonic functional relationship exists between the magnetic permeability and the temperature of the second sensing portion; and

[0011] a third sensing portion connected to the first sensing portion to sense the temperature of the first sensing portion, the third sensing portion having a third Curie temperature;

[0012] The first Curie temperature is greater than the second temperature, and the third Curie temperature is greater than or equal to the first temperature and less than the second temperature.

[0013] As an example, at least two of the first sensing portion, the second sensing portion and the third sensing portion are stacked in a thickness direction of the susceptor.

[0014] As an example, the second sensing portion is provided between the first sensing portion and the third sensing portion; or

[0015] The first sensing portion is disposed between the second sensing portion and the third sensing portion.

[0016] As an example, the susceptor further includes a heat-conducting connection portion, at least a portion of which is disposed between the second sensing portion and the first sensing portion, and connects the second sensing portion and the first sensing portion.

[0017] As an example, the first sensing portion comprises stainless steel or pure iron, the second sensing portion comprises permalloy, and the third sensing portion comprises a metal having a nickel content greater than or equal to 90% by mass.

[0018] As an example, the thickness of the first sensing portion is greater than or equal to the thickness of the second sensing portion, and the thickness of the second sensing portion is greater than or equal to the thickness of the third sensing portion; or

[0019] A ratio of a thickness of the first sensing portion to a thickness of the second sensing portion is approximately 3; or

[0020] The thickness of the first sensing portion is greater than the sum of the thicknesses of the second sensing portion and the third sensing portion; or

[0021] The volume of the first sensing portion is greater than or equal to the volume of the second sensing portion, and the volume of the second sensing portion is greater than or equal to the volume of the third sensing portion; or

[0022] The mass of the first sensing portion is greater than or equal to the mass of the second sensing portion, and the mass of the second sensing portion is greater than or equal to the mass of the third sensing portion.

[0023] As an example, the second sensing portion is further configured such that, at least in a temperature range between a first temperature and a second temperature, a rate of change of the magnetic permeability of the second sensing portion with temperature change is greater than a rate of change of the magnetic permeability of the first sensing portion with temperature change.

[0024] As an example, the second sensing portion has a second Curie temperature, which is greater than the second temperature and less than the first Curie temperature.

[0025] An embodiment of the present application provides an aerosol generating device for heating an aerosol generating product, characterized in that the aerosol generating device or the aerosol generating product includes the aforementioned receptor; the aerosol generating device includes:

[0026] power supply;

[0027] a magnetic field generator for generating a varying magnetic field; and

[0028] a controller configured to control the power supply to provide a first power to the magnetic field generator before the temperature of the susceptor reaches the third Curie temperature, obtain electrical parameters of the magnetic field generator after the temperature of the susceptor reaches the third Curie temperature, and control the power supply to provide a second power to the magnetic field generator based on the electrical parameters;

[0029] The first power is greater than the second power.

[0030] As an example, the duty cycle of the first power is greater than the duty cycle of the second power; or

[0031] The voltage of the first power is greater than the voltage of the second power; or

[0032] The current of the first power is greater than the current of the second power; or

[0033] The first power includes full-wave power output by the power supply to the magnetic field generator, and the second power includes chopped power output by the power supply to the magnetic field generator.

[0034] As an example, the heating of the aerosol-generating article by the aerosol-generating device includes a preheating stage, and the third Curie temperature is less than or equal to the highest temperature of the preheating stage.

[0035] As an example, the heating of the aerosol-generating article by the aerosol-generating device includes a puffing phase, during which the maximum operating temperature of the susceptor is less than or equal to the second temperature.

[0036] As an example, the second sensing portion has a second Curie temperature, and the second Curie temperature is greater than or equal to the second temperature;

[0037] The heating of the aerosol-generating article by the aerosol-generating device includes a puffing phase, during which the maximum temperature of the susceptor is greater than or equal to the second Curie temperature.

[0038] As an example, during the inhalation phase, the controller is configured to control the power supply to continue providing the second power to the magnetic field generator for a preset duration, or to control the power supply to terminate or reduce the second power provided to the magnetic field generator when the temperature of the susceptor reaches the second Curie temperature.

[0039] An aerosol-forming article provided in an embodiment of the present application includes the aforementioned susceptor and an aerosol-forming matrix, wherein at least a portion of the susceptor is disposed in the aerosol-forming matrix.

[0040] The embodiments of the present application provide a susceptor, an aerosol generating device, and an aerosol-forming article. The susceptor includes a first sensing portion for heating the aerosol-generating article, and a second sensing portion and a third sensing portion, both of which can sense the temperature of the first sensing portion. When the second sensing portion is in a temperature range between the first temperature and the second temperature, a monotonic function relationship exists between the magnetic permeability of the second sensing portion and its temperature. The first Curie temperature of the first sensing portion is greater than the second temperature, and the third Curie temperature of the third sensing portion is between the first temperature and the second temperature. Therefore, before reaching the third Curie temperature, even if the temperature of the receptor is not monitored, the temperature of the receptor can be prevented from overshooting due to the sudden change in the magnetic permeability of the third receptor when reaching the third Curie temperature, which can prevent the aerosol generating product from being burnt and the aerosol released by the aerosol generating product from burning the mouth. Moreover, after the temperature of the first receptor is higher than the third Curie temperature, the temperature of the receptor can be monitored within the temperature range between the first temperature and the second temperature according to the monotonic function relationship between the magnetic permeability of the second receptor and its temperature, so that the temperature of the receptor can be controllably continued to increase or controllably maintained stable, thereby meeting the more complex heating requirements of the aerosol generating product. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0042] FIG1 is a schematic diagram of an aerosol generating device and an aerosol generating article coupled together according to an embodiment of the present application;

[0043] FIG2 is a perspective schematic diagram of a sheet-like susceptor provided in one embodiment of the present application;

[0044] FIG3 is a cross-sectional view of a sheet-like susceptor provided in one embodiment of the present application;

[0045] FIG4 is a cross-sectional view of a sheet-like susceptor provided in one embodiment of the present application;

[0046] FIG5 is a perspective schematic diagram of a sheet-like susceptor provided in one embodiment of the present application;

[0047] FIG6 is an exploded schematic diagram of a sheet-like susceptor provided in one embodiment of the present application;

[0048] FIG7 is a cross-sectional view of a tubular receptor provided by another embodiment of the present application;

[0049] FIG8 is a cross-sectional view of a tubular receptor provided by another embodiment of the present application;

[0050] FIG9 is a diagram showing the relationship between the temperatures of the first sensing portion, the second sensing portion, and the third sensing portion and the quality factor of the magnetic field generator provided in one embodiment of the present application;

[0051] FIG10 is a diagram showing the relationship between the temperatures of the first sensing portion, the second sensing portion, and the third sensing portion and the impedance of the magnetic field generator provided in one embodiment of the present application;

[0052] FIG11 is a diagram showing the relationship between the temperatures of the first sensing portion, the second sensing portion, and the third sensing portion and the AC resistance of the magnetic field generator provided in one embodiment of the present application;

[0053] FIG12 is a diagram showing the relationship between the temperatures of the first sensing portion, the second sensing portion, and the third sensing portion and the inductance of the magnetic field generator provided in one embodiment of the present application;

[0054] In the picture:

[0055] 1. aerosol-generating article; 11. aerosol-forming substrate; 12. nozzle; 13. cooling element;

[0056] 2. Magnetic field generator;

[0057] 3. Power supply assembly; 31. Power supply; 32. Circuit board;

[0058] 4. Sensor; 41. First sensing portion; 42. Second sensing portion; 43. Third sensing portion; 44. Thermally conductive connection portion; 45. Protective coating;

[0059] 5. Controller;

[0060] 6. Accommodation cavity. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0062] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or suggesting relative importance or implicitly indicating the quantity or order of the indicated technical features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative position relationship or movement situation between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or equipment that includes a series of steps or units is not limited to the steps or units listed, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0063] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be one or more intermediate elements in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0065] Referring to FIG. 1 , an embodiment of the present application provides a receptor 4 , which may be a component of an aerosol generating device or an aerosol generating article 1 , wherein the aerosol generating device is used to enable the aerosol generating article 1 to generate aerosol.

[0066] As used herein, the term "aerosol-generating article" refers to an article comprising an aerosol-forming substrate that, when heated, releases volatile compounds that can form an aerosol. An "aerosol-generating article" refers to an article comprising an aerosol-forming substrate that is intended to be heated, rather than combusted, to release volatile compounds that can form an aerosol. Aerosols formed by heating an aerosol-forming substrate may contain fewer components known to be hazardous than aerosols produced by combustion or pyrolytic degradation of the aerosol-forming substrate. In one embodiment, the aerosol-generating article is removably connectable to an aerosol-generating device. The article may be disposable or reusable.

[0067] In one example, the aerosol-forming substrate 11 may comprise a tobacco-containing material containing tobacco flavor compounds, plant flavor compounds, fruity tobacco flavor compounds, or nicotine, wherein the compounds or nicotine are released when the tobacco material is heated to a suitable temperature. The tobacco material may include shredded tobacco, tobacco particles, etc. In another example, the aerosol-forming substrate 11 may comprise a non-tobacco material.

[0068] The outer diameter of the aerosol-generating article 1 may be between about 5 mm and about 12 mm, for example between about 5.5 mm and about 8 mm. In one embodiment, the outer diameter of the aerosol-generating article 1 is 6 mm + / - 10%.

[0069] The total length of the aerosol-generating article 1 may be between about 25 mm and about 100 mm. The total length of the aerosol-generating article 1 may be between about 30 mm and about 100 mm. In one embodiment, the total length of the aerosol-forming substrate accounts for about ½ of the total length of the aerosol-generating article 1. In another embodiment, the total length of the aerosol-generating article 1 is about 45 mm. In yet another specific embodiment, the total length of the aerosol-forming substrate is about 33 mm.

[0070] Referring to Figure 1 , an aerosol-generating article 1 includes a mouthpiece 12, which is held in the mouth of a user and includes a filter formed from a cellulose acetate tow. The aerosol-generating article 1 may further include a cooling element 13, which provides a passageway for airflow between the aerosol-forming substrate 11 and the filter 121. The high-temperature aerosol generated by the aerosol-forming substrate 11 cools down after passing through the cooling element 13 before entering the filter. The cooling element 13 may include, but is not limited to, polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil.

[0071] The sensor 4 includes a heating element, which mainly plays a heating role. At least part of the heat released by the first sensing portion 41 can heat the aerosol-forming product 1, so that the aerosol-forming matrix 11 produces an aerosol. In one embodiment of the present application, the heating element includes a first sensing portion 41, which can generate an induced current and / or hysteresis in a changing magnetic field, thereby releasing heat. It should be noted that the heating element may include a resistive heating element or an infrared heating element. The resistive heating element or the infrared heating element can be used to replace the first sensing portion for heating. The resistive heating element or the infrared heating element can coexist with the first sensing portion. For embodiments including resistive heating elements or infrared heating elements, this application does not elaborate in detail.

[0072] The first sensing portion 41 includes, but is not limited to, aluminum, iron, nickel, copper, bronze, cobalt, ordinary carbon steel, stainless steel, ferritic stainless steel, martensitic stainless steel, or austenitic stainless steel. In one embodiment, the first sensing portion 41 may be made of a ferromagnetic material, such as ferrite, ferromagnetic steel, or stainless steel, or may be made of a nickel-iron alloy, or may be made of a 4-series stainless steel, including, but not limited to, 409-grade stainless steel, 410-grade stainless steel, 420-grade stainless steel, 430-grade stainless steel, 436-grade stainless steel, 439-grade stainless steel, 441-grade stainless steel, or 444-grade stainless steel. Preferably, the first sensing portion 41 comprises 430-grade stainless steel or pure iron. In one embodiment, the iron content of the first sensing portion 41 is greater than or equal to 40% by weight. Preferably, the iron content of the first sensing portion 41 is greater than or equal to 75% by weight, for example, between 75% and 90%.

[0073] The first sensing portion 41 has a first Curie temperature. When the temperature of the first sensing portion 41 reaches the first Curie temperature, the magnetic phase of the first sensing portion 41 will reversibly change from a diamagnetic phase to a paramagnetic phase, its magnetic permeability or magnetization degree approaches zero, and the magnetic induced current therein almost disappears.

[0074] The Curie temperature of the first sensing portion 41 may be higher than the maximum desired heating temperature of the aerosol-forming article 1, which may be defined as a temperature at which at least a portion of the aerosol-forming article 1 overheats or burns. The Curie temperature of the first sensing portion 41 may be no less than 500° C. The Curie temperature of the first sensing portion 41 may be greater than 600° C.

[0075] Referring to Figures 2-8 , the susceptor 4 also includes a second sensing portion 42. In a changing magnetic field, the second sensing portion 42 can be magnetized and generate induced current and heat. The first sensing portion 41 and the second sensing portion 42 are connected, either by at least a portion of the first sensing portion 42 being in contact with the second sensing portion 41, thereby achieving a direct connection between the two, or by a spacer between the first and second sensing portions 42, which simultaneously connects the first and second sensing portions 42, thereby achieving an indirect connection between the first and second sensing portions 42.

[0076] The second sensing portion 42 is connected to the first sensing portion 41. Through heat conduction and heat generation of the first sensing portion 41 and / or the second sensing portion 42, the first sensing portion 42 and the second sensing portion 42 have approximately the same temperature. Therefore, the second sensing portion 42 can be used to sense the temperature of the first sensing portion 41, and the temperature of the second sensing portion 42 can be used to represent the temperature of the first sensing portion 41 or the temperature of the sensor 4.

[0077] In an embodiment of the present application, the second sensing portion 42 and / or its structure enables the second sensing portion 42 to have the following properties: when the second sensing portion 42 is in a temperature range between the first temperature and the second temperature, there is a monotonic functional relationship between the magnetic permeability of the second sensing portion 42 and the temperature of the second sensing portion 42. The so-called "functional relationship" is a relationship between deterministic phenomena. In other words, in the temperature range between the first temperature and the second temperature, the magnetic permeability of the second sensing portion 42 changes with the change of its temperature, and after the temperature of the second sensing portion 42 is determined, the magnetic permeability of the second sensing portion 42 is also completely determined, and vice versa. The "monotonic function relationship" includes a monotonically increasing function relationship or a monotonically decreasing function relationship, that is, in the temperature range between the first temperature and the second temperature, the magnetic permeability of the second sensing part 42 increases monotonically with the increase of its temperature, or the magnetic permeability of the second sensing part 42 decreases monotonically with the increase of its temperature, so that in the temperature range between the first temperature and the second temperature, the magnetic permeability of the second sensing part 42 has only one temperature corresponding to it, so that when obtaining the magnetic permeability or the electrical parameters associated with the magnetic permeability, the unique temperature at this time can be determined according to the monotonic function relationship.

[0078] Furthermore, in the temperature range between the first temperature and the second temperature, the relationship between the magnetic permeability of the second sensing portion 42 and its temperature may be linear or nonlinear.

[0079] The properties of the second sensing portion 42 may also include: before the first temperature, the magnetic permeability of the second sensing portion 42 is approximately constant, or the rate of change of the magnetic permeability of the second sensing portion 42 with temperature is very small, for example, for each 1°C temperature change, the corresponding change in magnetic permeability approaches zero, or the rate of change of the magnetic permeability of the second sensing portion 42 with temperature before the first temperature is less than the rate of change of the magnetic permeability with temperature in the temperature range between the first and second temperatures. The first temperature is greater than room temperature, and the first temperature may be greater than 50°C, 100°C, 150°C, 200°C, 250°C, 300°C, or 350°C. The first temperature may be between 50°C and 350°C. The first temperature may be less than or equal to the highest temperature in the preheating stage.

[0080] The second sensing portion 42 meeting the aforementioned property requirements includes, but is not limited to, permalloy. Specifically, the second sensing portion 42 comprises permalloy 1J85. In one embodiment, the second sensing portion 42 comprises a nickel-iron alloy having a nickel content of approximately 78%-82% by weight and an iron content of approximately 18%-20% by weight.

[0081] The first Curie temperature is greater than or equal to the second temperature. Therefore, when the temperature is less than or equal to the second temperature, the first sensing portion 41 can maintain a higher magnetic permeability and a higher heating efficiency. The second temperature is greater than the first temperature, the second temperature may be less than 500°C, the second temperature may be less than 450°C, the second temperature may be greater than or equal to the maximum temperature in the preheating stage, or the second temperature may be less than or equal to the maximum temperature in the preheating stage. The second temperature may be approximately 400°C, 410°C or 420°C. In one embodiment, the temperature range between the first temperature and the second temperature is a temperature range between 300°C and 410°C.

[0082] The temperatures of the first and second sensing parts 41 and 42 between the first and second temperatures may be characterized or reflected by the temperature-dependent magnetic permeability of the second sensing part 42 between the first and second temperatures, or an electrical parameter associated with the magnetic permeability.

[0083] In one embodiment, in the temperature range between the first temperature and the second temperature, the magnetic permeability of the second sensing portion 42 decreases as the temperature increases. As a result, when the temperature of the susceptor 4 is greater than the first temperature and continues to rise, the heating efficiency of the second sensing portion 42 gradually decreases. During this process, the heating efficiency of the first sensing portion 41 remains almost unchanged, while the overall heating efficiency of the susceptor 4 gradually decreases.

[0084] The second sensing portion 42 has a second Curie temperature. When the temperature of the second sensing portion 42 reaches the second Curie temperature, the magnetic phase of the second sensing portion 42 reversibly changes from a diamagnetic phase to a paramagnetic phase, its magnetic permeability or magnetization approaches zero, and the magnetic induced current therein almost disappears. In one example, the second Curie temperature is greater than or equal to the second temperature. Thus, when the temperature is less than or equal to the second Curie temperature, the second sensing portion 42 can generate heat together with the first sensing portion 41.

[0085] The second Curie temperature is less than the ignition point of the aerosol-forming article 1. The second Curie temperature may be less than 500°C. Further, the second Curie temperature may be less than 450°C. The second Curie temperature may be less than or equal to the maximum temperature during the preheating phase or the puffing phase. The second Curie temperature may be greater than the maximum temperature during the preheating phase or the puffing phase. The second Curie temperature may be related to the suitable heating temperature of the aerosol-forming article 1 and may be within the range of the heating temperature to which the susceptor 4 should be heated.

[0086] The first Curie temperature may be greater than or equal to the second Curie temperature, the first Curie temperature may be at least 50° C. greater than the second Curie temperature, or the first Curie temperature may be 100° C. greater than the second Curie temperature, to ensure that the first sensing portion 41 can still maintain a high magnetic permeability and a high heating efficiency when the second temperature or the second Curie temperature is reached.

[0087] The sensor 4 also includes a third sensing portion 43, which can be magnetized in a changing magnetic field and generate induced current and heat. The first sensing portion 41 is connected to the third sensing portion 43, either by at least partially contacting the first sensing portion 42 with the third sensing portion 43, thereby achieving a direct connection between the two, or by providing a spacer between the first and third sensing portions 42, 43, which simultaneously connects the first and third sensing portions 42, 43, thereby achieving an indirect connection between the two. In one example, referring to FIG. 3 , the spacer between the first and third sensing portions 42, 43 includes the second sensing portion 42.

[0088] The third sensing portion 43 is connected to the first sensing portion 41. Through heat conduction and heat generation of the first sensing portion 42 and / or the third sensing portion 43, the first sensing portion 42 and the third sensing portion 43 are made to have approximately the same temperature, or the first sensing portion 42, the second sensing portion 42 and the third sensing portion 43 are made to have approximately the same temperature. Therefore, the third sensing portion 43 can be used to sense the temperature of the receptor 4 and the first sensing portion 41. When the third sensing portion 43 reaches the third Curie temperature and a sudden change in magnetic permeability occurs, it can be indicated that the temperature of the receptor 4, the first sensing portion 41 and / or the second sensing portion 42 has also basically reached the third Curie temperature.

[0089] Specifically, the third sensing portion 43 has a third Curie temperature. When the temperature of the third sensing portion 43 reaches the third Curie temperature, the magnetic phase of the third sensing portion 43 will reversibly change from a reverse magnetic phase to a paramagnetic phase, its magnetic permeability or magnetization degree approaches zero, and the magnetic induction current therein almost disappears.

[0090] In one embodiment of the present application, the third sensing portion 43 and / or its structure enables the third sensing portion 43 to have the following properties: before reaching the third Curie temperature, the magnetic permeability of the third sensing portion 43 is approximately constant, or the rate of change of the magnetic permeability of the third sensing portion 43 with temperature is very small and approaches zero.

[0091] The third Curie temperature may be within a temperature range between the first temperature and the second temperature, i.e., the third Curie temperature may be greater than or equal to the first temperature and less than the second temperature. Thus, the third Curie temperature may be used as a starting point for the second sensing portion 42 to sense the temperature of the first sensing portion 41.

[0092] The third Curie temperature is lower than the second Curie temperature. When the temperature is less than or equal to the third Curie temperature, the third sensing portion 43 can generate heat together with the first sensing portion 41 and the second sensing portion 42, thereby improving the heating efficiency and temperature rise rate of the susceptor 4. When the temperature is greater than the third Curie temperature but less than the second temperature, the first sensing portion 41 and the second sensing portion 42 can generate heat together. When the temperature is greater than the second Curie temperature, the first sensing portion 41 can still continue to generate heat.

[0093] The third Curie temperature may be less than or equal to the maximum heating temperature of the susceptor 4, the third Curie temperature may be less than or equal to the highest temperature during the preheating stage and / or the inhalation stage, and may be approximately 354°C.

[0094] The third sensing portion 43 may include, but is not limited to, a metal having a nickel content greater than or equal to 90% by mass, and the third sensing portion 43 may be pure nickel.

[0095] In one embodiment, referring to Figures 2-4 , the susceptor 4 further includes a thermally conductive connection portion 44. The thermally conductive connection portion 44 is at least partially disposed between the second susceptor portion 42 and the first susceptor portion 41, connecting the second susceptor portion 42 and the first susceptor portion 41. The thermally conductive connection portion 44 forms part of a spacer between the second susceptor portion 42 and the first susceptor portion 41.

[0096] In one example, the thermally conductive connection portion 44 includes a nickel layer, and the second sensing portion 42 includes nickel. First, the nickel layer is formed on the surface of the first sensing portion 41 by electroplating or other methods. The nickel layer is then bonded to the nickel element in the second sensing portion 42 to form a metallic bond, thereby ensuring that the first sensing portion 41 and the second sensing portion 42 are bonded to each other and are not easily separated.

[0097] In one example, the thermally conductive connection portion 44 includes a copper layer, and a composite method of heating and rolling can be used to fuse the opposite sides of the copper layer with the first sensing portion 41 and the second sensing portion 42, respectively, so that the first sensing portion 41 and the second sensing portion 42 are tightly combined and not easily separated.

[0098] In one example, the thickness of the thermally conductive connection portion 44 is less than 0.2 mm, and the thickness of the thermally conductive connection portion 44 may be between 1 μm and 10 μm. To reduce energy consumption and improve the efficiency of heat conduction between the first sensing portion 41 and the second sensing portion 42, and to ensure that the temperatures of the first sensing portion 41 and the second sensing portion 42 are consistent, the thickness of the thermally conductive connection portion 44 is preferably between 1 μm and 3 μm.

[0099] In one embodiment, referring to Figures 2 to 4, the receptor 4 further includes a protective coating 45, which is formed on the surface of the receptor 4. The protective coating 45 is used to protect the first receptor 41, the second receptor 42, and / or the third receptor 43 from being corroded by the aerosol-forming matrix 11 or the aerosol. The protective coating 45 can also prevent the first receptor 41, the second receptor 42, and / or the third receptor 43 from being oxidized, and can also prevent the release of metal elements such as Ni, Cr, and Fe in the receptor 4.

[0100] The protective coating 45 can be made of a non-magnetic material, making it non-magnetic. The protective coating 45 has a low resistivity and a small thickness, which can be less than 5 μm. This helps increase the magnitude of the induced eddy currents on the surface of the susceptor 4 and improve the conversion efficiency of the induced eddy currents, given the same induced electromotive force. The protective coating 45 can have a high thermal conductivity to ensure a uniform temperature distribution on the surface of the susceptor 4, resulting in good heating uniformity. The protective coating 45 can include, but is not limited to, gold, silver, or copper. The protective coating 45 can be formed on the surface of the susceptor 4 by electroplating or other methods.

[0101] In one embodiment, referring to FIG. 2 to FIG. 8 , at least two of the first sensing portion 41 , the second sensing portion 42 and the third sensing portion 43 are stacked in the thickness direction of the susceptor 4 .

[0102] Based on this, as an example, referring to Figure 2, the projections of the first sensing portion 41, the second sensing portion 42 and the third sensing portion 43 along the thickness direction of the sensor 4 overlap with each other and have equal areas, so that the first sensing portion 41, the second sensing portion 42 and the third sensing portion 43 have a larger contact area with each other, which is conducive to good temperature consistency among the first sensing portion 41, the second sensing portion 42 and the third sensing portion 43.

[0103] Alternatively, referring to Figures 5 and 6 , the area of ​​the second sensing portion 42 and / or the third sensing portion 43 is smaller than that of the first sensing portion 41, so that the projection areas of the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 along the thickness direction of the susceptor 4 are smaller than the projection area of ​​the first sensing portion 41. Therefore, under the premise that the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 are stacked in the thickness direction, the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 are in surface contact with each other, which is beneficial for ensuring good temperature consistency among the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43.

[0104] As an example, referring to Figures 2 and 5 , at least a portion of the susceptor 4 is formed into a sheet shape, and therefore at least a portion of the first sensing portion 41 can also be configured into a sheet shape. The sheet-shaped portion of the first sensing portion 41 is then stacked with the second sensing portion 42 and the third sensing portion 43 in the thickness direction. The second sensing portion 42 and the third sensing portion 43 can be configured into at least one of a sheet shape, a block shape, or a strip shape.

[0105] Alternatively, referring to Figures 7 and 8 , at least a portion of the susceptor 4 may be formed into a tubular shape, and at least a portion of the first sensing portion 41, at least a portion of the second sensing portion 42, and at least a portion of the third sensing portion 43 may also be configured into a tubular shape, with the tubular portions of the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 stacked one on top of the other in the thickness direction. When at least a portion of the susceptor 4 is formed into a tubular shape, any of the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 may be disposed on the outside or the inside. This arrangement allows the first sensing portion 41 to be closer to the aerosol-generating article 1, or the third sensing portion 43 to be closer to the aerosol-generating article 1.

[0106] In one embodiment, the first sensing portion, the second sensing portion, and the third sensing portion are stacked in a longitudinal direction of the sensor, so that the contact between the first sensing portion, the second sensing portion, and the third sensing portion is similar to line contact.

[0107] 3 , the second sensing portion 42 may be disposed between the first sensing portion 41 and the third sensing portion 43. In other embodiments, the third sensing portion 43 and the second sensing portion 42 may be disposed on opposite sides of the first sensing portion 41, as shown in FIG.

[0108] The sensor 4 mainly generates heat through the first sensing part 41, the second sensing part 42 plays a secondary role in heating, and the third sensing part 43 can also generate heat. During the heating process of the sensor 4, heat conduction can occur between the first sensing part 41 and the second sensing part 42 and the third sensing part 43, and heat can be mainly conducted from the first sensing part 41 to the second sensing part 42 and the third sensing part 43. That is, during the heating process of the sensor 4, among the first sensing part 41, the second sensing part 42 and the third sensing part 43, the first sensing part 41 can generate the most total heat, or the first sensing part 41 can have the highest heating efficiency among the three. In some examples, the total heat generated by the second sensing part 42 is greater than the total heat generated by the third sensing part 43, and the heating efficiency of the second sensing part 42 is higher than the heating efficiency of the third sensing part 43. Here, the heating efficiency refers to the heat generated by the sensing part per unit volume per unit time.

[0109] In one example, referring to Figures 3, 4, and 6, the thickness of the first sensing portion 41 is greater than or equal to the thickness of the second sensing portion 42, and the thickness of the second sensing portion 42 is greater than or equal to the thickness of the third sensing portion 43. Alternatively, the ratio of the thickness of the first sensing portion 41 to the thickness of the second sensing portion 42 is approximately 3, or the thickness of the first sensing portion 41 is greater than the sum of the thicknesses of the second and third sensing portions 42, 43. Based on the heat formula: Q = CMΔT, where Q is heat, C is specific heat capacity, M is mass, and ΔT is temperature change, the second and third sensing portions 42, 43 are made relatively thin, thereby reducing their mass and the amount of heat they absorb from the first sensing portion 41 when they maintain a roughly consistent temperature with the first sensing portion 41. This, in turn, reduces power consumption and minimizes the impact on the heating rate of the susceptor 4.

[0110] The thickness of the third sensing portion 43 may be between 2 μm and 10 μm, that is, the thickness of the third sensing portion 43 may be any value between 2 μm and 10 μm, including 2 μm and 10 μm. The thickness of the second sensing portion 42 may be between 10 μm and 30 μm.

[0111] The thickness of the first sensing portion 41 is greater than its skin depth. Excessive thickness would dissipate a significant amount of the energy released by the first sensing portion 41. However, the first sensing portion 41 also serves as a support for the second sensing portion 42 and the third sensing portion 43. Therefore, the thickness of the first sensing portion 41 must meet the predetermined hardness requirement. Therefore, the thickness of the first sensing portion 41 can be between 30 μm and 90 μm.

[0112] In one example, the volume of the first sensing portion 41 is greater than or equal to the volume of the second sensing portion 42, and the volume of the second sensing portion 52 is greater than or equal to the volume of the third sensing portion 43. When the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 have approximately the same thickness, the first sensing portion 41 has the largest area, the second sensing portion 42 has the second largest area, and the third sensing portion 43 has the smallest area. When the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 have approximately the same area, the thicknesses of the first sensing portion 41, the second sensing portion 42, and the third sensing portion 43 decrease in that order.

[0113] This helps to reduce the power consumption of the susceptor 4 and improve the heating efficiency and heating speed of the susceptor 4.

[0114] In one example, the mass of the first sensing portion 41 is greater than or equal to the mass of the second sensing portion 42, and the mass of the second sensing portion 42 is greater than or equal to the mass of the third sensing portion 43. Thus, by making the second sensing portion 42 and the third sensing portion 43 have relatively small masses, the heat absorbed by the second sensing portion 42 and the third sensing portion 43 from the first sensing portion 41 when the temperature is substantially the same as that of the first sensing portion 41 is reduced, thereby reducing power consumption.

[0115] The interior of the aerosol-generating device comprises a receiving cavity 6 for at least partially receiving the aerosol-forming article 1 .

[0116] In one embodiment, the susceptor 4 is a component of the aerosol-forming article 1. The susceptor 4 may be disposed within the aerosol-forming article 1, and at least a portion of the susceptor 4 may be disposed within the aerosol-forming substrate 11, such that at least a portion of the susceptor 4 may be in contact with the aerosol-forming substrate 11. For example, the susceptor 4 may be inserted into the aerosol-forming substrate 11. Thus, when the aerosol-forming article 1 is contained within the containing cavity 6, the susceptor 4 within the aerosol-forming article 1 is within the magnetic field coverage of the magnetic field generator 2. It should be noted that in other examples, the susceptor is a component of the aerosol-forming article, but the susceptor is disposed at the periphery of the aerosol-forming substrate. The susceptor may surround and contact the aerosol-forming substrate. Alternatively, the susceptor may be fixed to or be a component of the outer shell of the aerosol-forming article and surround the outer shell of the aerosol-forming substrate.

[0117] In one embodiment, the susceptor 4 is a component of the aerosol-generating device. At least a portion of the receiving cavity 6 is configured to be within the magnetic field coverage of the magnetic field generator 2. At least a portion of the susceptor 4 is disposed at the periphery of the aerosol-forming article 1 to circumferentially heat the aerosol-forming article 1, or at least a portion of the susceptor 4 is arranged in the receiving cavity 6 so as to be inserted into the interior of the aerosol-forming article 1 when the aerosol-forming article 1 is engaged with the receiving cavity 6.

[0118] The aerosol generating device includes a power supply assembly 3 and a magnetic field generator 2 .

[0119] The magnetic field generator 2 is capable of generating a varying magnetic field to heat a susceptor 4 located within the varying magnetic field. During use, the susceptor 4 is located within the varying magnetic field generated by the magnetic field generator 2. The magnetic field generator 2 is electrically connected to a power supply assembly 3, which provides the magnetic field generator 2 with current to generate the varying magnetic field. The magnetic field generator 2 may include one or more induction coils that generate the varying magnetic field, and the one or more induction coils may surround the susceptor 4. In one embodiment, the aerosol generating device is capable of generating a varying magnetic field between 1 and 30 MHz, such as between 2 and 10 MHz, or between 5 and 7 MHz. In one embodiment, the aerosol generating device is capable of generating a varying magnetic field having a field strength (H field) between 1 and 5 kA / m, such as between 2 and 3 kA / m, or about 2.5 kA / m.

[0120] In one embodiment, the first sensing portion 41 , the second sensing portion 42 , and the third sensing portion 43 may be surrounded by the same induction coil, or may be in a changing magnetic field generated by the same induction coil.

[0121] The power supply assembly 3 can include any suitable power source 31, such as a DC source, such as a battery. In one embodiment, the power source 31 is a lithium-ion battery. Alternatively, the power source 31 can be a nickel metal hydride battery, a nickel cadmium battery, or a lithium-based battery, such as a lithium cobalt, lithium iron phosphate, lithium titanate, or lithium polymer battery.

[0122] The power supply assembly 3 may include one or more circuit boards 32, each of which includes a control circuit. The control circuit can control the output of the power supply 31, for example, causing the power supply 31 to output alternating current or direct current, or to output current or voltage in pulsed form. The control circuit may include one or more controllers 5, which can be used to protect the power supply 31 or control its power output. The controller 5 can control the overall operation of the aerosol generating device. Specifically, the controller 5 controls not only the operation of the power supply 31 and the magnetic field generator 2, but also the operation of other components in the aerosol generating device. Furthermore, the controller 5 can determine whether the aerosol generating device is operational by checking the status of its components. The controller 5 may include at least one microprocessor or microcontroller. The microprocessor or microcontroller may include a logic gate array, or may include a combination of a general-purpose microprocessor and a memory for storing executable programs within the microprocessor.

[0123] In one embodiment, the controller 5 is configured to control the power supply 31 to provide the first power to the magnetic field generator 2 before the temperature of the susceptor 4 reaches the third Curie temperature, and after the temperature of the susceptor 4 reaches the third Curie temperature, obtain electrical parameters of the magnetic field generator 2, and control the power supply 31 to provide the second power to the magnetic field generator 2 based on the electrical parameters.

[0124] The underlying principle is this: a changing current passing through magnetic field generator 2 generates a changing magnetic field. This changing magnetic field acts on susceptor 4, generating eddy currents that are converted into heat. Magnetic field generator 2 possesses certain property parameters, namely electrical parameters, such as inductance, AC resistance, DC resistance, and quality factor. When susceptor 4 is placed within the influence of magnetic field generator 2, these parameters, with the exception of DC resistance, vary with the location of susceptor 4, its magnetic permeability, size, material, volume within the influence zone, and temperature within the influence zone.

[0125] The magnetic permeability of the susceptor 4 material directly affects its heating rate and efficiency. Research has found that changes in the property parameters / electrical parameters of the magnetic field generator 2 are directly related to the magnetic permeability of the susceptor 4. Between the first and second temperatures, the magnetic permeability of the second susceptor 42 varies with temperature, with a one-to-one correspondence. When the temperature reaches the third Curie temperature, the magnetic permeability of the third susceptor 43 drops sharply. Therefore, the electrical parameters of the magnetic field generator 2 can be used to indicate whether the susceptor 4 has reached the third Curie temperature and the specific temperature value of the susceptor 4 between the first and second temperatures.

[0126] Figure 9 shows the relationship between the temperatures of the first, second, and third sensing parts 41, 42, and 43, respectively, and the quality factor (Q value) of the magnetic field generator 2 under the same magnetic field. Below 450°C, the temperature change of the first sensing part 41 has little effect on the quality factor. The temperature change of the second sensing part 42 between the first and second temperatures has a greater impact on the quality factor. In the temperature range between the first and second temperatures, the quality factor of the magnetic field generator 2 decreases monotonically with increasing temperature, resulting in a one-to-one correspondence between temperature and quality factor. When the third sensing part 43 reaches its Curie temperature, the quality factor of the magnetic field generator 2 undergoes a sudden change.

[0127] FIG10 shows the relationship between the temperature of the first sensing part 41 , the second sensing part 42 , and the third sensing part 43 and the impedance Zs of the magnetic field generator 2 in the same magnetic field.

[0128] FIG11 shows the relationship between the temperatures of the first sensing portion 41 , the second sensing portion 42 , and the third sensing portion 43 and the AC resistance Z of the magnetic field generator 2 in the same magnetic field.

[0129] FIG12 shows the relationship between the temperatures of the first sensing portion 41 , the second sensing portion 42 , and the third sensing portion 43 and the inductance Ls of the magnetic field generator 2 in the same magnetic field.

[0130] In this embodiment, the second power is different from the first power, and preferably is less than the first power. More specifically, in one example, the duty cycle of the first power is greater than the duty cycle of the second power; in one example, the first power includes the full-wave power output by the power supply 31 to the magnetic field generator 2, and the second power includes the chopped power output by the power supply 31 to the magnetic field generator 2; in one example, the voltage of the first power is greater than the voltage of the second power; in one example, the AC current frequency of the first power is greater than the AC current frequency of the second power; and in one example, the current of the first power is greater than the current of the second power.

[0131] The magnitude of the second power may be non-constant. The magnitude of the first power may be non-constant. The second power being smaller than the first power may be understood as the average power of the second power being smaller than the average power of the first power.

[0132] The magnitude of the first power may be constant. The magnitude of the second power may be constant.

[0133] When the temperature of susceptor 4 is below the third Curie temperature, controller 5 can directly control power supply 31 to provide the first power to magnetic field generator 2, so that the magnitude of the first power is independent of the electrical parameters of magnetic field generator 2 and the temperature of susceptor 4. When the temperature is below the third Curie temperature, the electrical parameters of magnetic field generator 2 and the temperature of susceptor 4 do not affect the magnitude of the first power. This reduces the number of electrical parameter acquisitions, analysis, and processing, helping to simplify the control program, shorten the response time of controller 5, improve the control and processing efficiency of controller 5, and shorten the heating time of susceptor 4.

[0134] In one example, when the temperature of the susceptor 4 reaches the third Curie temperature, the controller 5 immediately controls the power supply 31 to switch the power provided to the magnetic field generator 2 from the first power to the second power.

[0135] Since the third Curie temperature is between the first temperature and the second temperature, the controller 5 can, after obtaining information that the temperature of the susceptor 4 has reached the third Curie temperature, start obtaining the electrical parameters of the magnetic field generator 2 with the third Curie temperature as the starting point, monitor and regulate the temperature of the susceptor 4 between the third Curie temperature and the second temperature, so that the heating temperature of the susceptor 4 meets the preset heating curve.

[0136] Specifically, after the temperature of the susceptor 4 reaches the third Curie temperature, the controller 5 controls the power supply 31 to provide the magnetic field generator 2 with a second power whose magnitude is affected by the electrical parameters of the magnetic field generator 2. The controller 5 can use these electrical parameters as a basis for controlling the magnitude of the second power. Based on this, the temperature range within which the susceptor 4 heats the aerosol-forming article 1 can be primarily between the first and second temperatures, or can be primarily between the third and second Curie temperatures.

[0137] More specifically, heating of the aerosol-forming article 1 by the susceptor 4 may include two stages: a preheating stage and a puffing stage. During the preheating stage, the susceptor 4 is heated from room temperature or an initial temperature to a maximum temperature during the preheating stage, enabling the aerosol-forming article 1 to quickly generate smoke / aerosol that meets the user's first puff. The maximum temperature during the preheating stage may be maintained for a period of time as needed. The maximum temperature during the preheating stage may not be maintained. Aerosol generation by the aerosol-forming article 1 primarily occurs during the puffing stage. The temperature during the puffing stage may fluctuate as cool air enters the aerosol-forming article 1 due to puffing. The maximum temperature during the puffing stage is lower than the maximum temperature during the preheating stage.

[0138] In one embodiment, the third Curie temperature is less than or equal to the maximum temperature during the preheating phase. Therefore, before reaching the third Curie temperature, the controller 5 controls the power source 31 to provide the first power to the magnetic field generator 2. Furthermore, before reaching the third Curie temperature, the temperature of the susceptor 4 does not exceed the maximum temperature during the preheating phase. Consequently, the first, second, and third sensing portions 41, 42, 43 all generate heat at the first power. Furthermore, the first power is the highest power applied to the susceptor 4 during the heating of the aerosol-forming article 1. Consequently, the controller 5 has a very short response time, and the susceptor 4 has a very fast heating rate and high heating efficiency, which helps shorten the time it takes for the susceptor 4 to reach the maximum temperature during the preheating phase, thereby improving the user experience.

[0139] As a specific example, the third Curie temperature is lower than the maximum temperature of the preheating stage. Therefore, after the temperature of the susceptor 4 reaches the third Curie temperature, the first and second sensing portions 41, 42 continue to generate heat under the second power, and the temperature of the susceptor 4 continues to rise until it reaches the maximum temperature of the preheating stage. Furthermore, during the process of increasing the temperature from the third Curie temperature to the maximum temperature of the preheating stage, the controller 5 obtains the electrical parameters of the magnetic field generator 2 one or more times and adjusts the magnitude of the second power based on these electrical parameters representative of the temperature of the susceptor 4, so that the susceptor 4 reaches the maximum temperature of the preheating stage according to a preset temperature curve, and subsequently ensures that the temperature during the preheating stage substantially matches the preset preheating stage temperature curve, and that the temperature during the inhalation stage substantially matches the preset inhalation stage temperature curve.

[0140] Because the first power is greater than the second power, the magnetic field intensity generated by magnetic field generator 2 under the first power is greater than the magnetic field intensity generated by magnetic field generator 2 under the second power. Therefore, the temperature rise rate of susceptor 4 under the first power is greater than the temperature rise rate of susceptor 4 under the second power. When the first power is switched to the second power, the magnitude of the magnetic field provided by magnetic field generator 2 does not change suddenly, but gradually. Therefore, after the first power is switched to the second power, the high magnetic field intensity can still be maintained for a short period of time. Therefore, setting the third Curie temperature below the maximum temperature of the preheating stage can prevent the temperature of susceptor 4 from continuing to rise rapidly to exceed the preset maximum temperature of the preheating stage within a short period of time after reaching the third Curie temperature. This could cause a temperature overshoot, resulting in the temperature of the first aerosol being too high and burning the mouth, or causing the aerosol-generating product to be burnt, affecting the taste of the first aerosol.

[0141] After the first power is switched to the second power, the temperature increase speed of the susceptor 4 can be slowed down, ensuring that the temperature of the susceptor 4 can be increased to the preset maximum temperature in the preheating stage and even maintain the maximum temperature for a preset time.

[0142] In one embodiment, during the puffing stage, the temperature of the susceptor 4 is greater than or equal to the third Curie temperature, so that during the puffing stage, the third sensing portion 43 can always be in a low permeability or no permeability state, and can generate no heat or only a small amount of heat.

[0143] In one embodiment, during the puffing phase, if a user takes a large puff, causing a large amount of cold air to enter the aerosol-forming article 1, causing the temperature of the susceptor 4 to drop below the third Curie temperature, or if the temperature drops below the third Curie temperature during the puffing phase due to other reasons, the controller 5 again controls the power supply 31 to provide the first power to the magnetic field generator 2, thereby rapidly increasing the temperature of the susceptor 4 and enabling the aerosol-forming article 1 to quickly generate a sufficient amount of aerosol to meet the user's next puff. After the temperature of the susceptor 4 returns to above the third Curie temperature, the controller 5 again controls the power supply 31 to provide the second power to the magnetic field generator 2 to prevent temperature overshoot and prevent the aerosol-forming article 1 from overheating and burning or burning the mouth, thereby ensuring the taste of the aerosol generated by the aerosol-forming article 1 and reducing harmful substances.

[0144] In one embodiment, during the puffing phase, the maximum temperature of the susceptor 4 is less than or equal to the second temperature. Between the first and second temperatures, the magnetic permeability of the second sensing portion 42 varies with temperature, with a one-to-one correspondence. Therefore, during the puffing phase, the primary cause of changes in the electrical parameters of the magnetic field generator 2 is changes in the magnetic permeability of the second sensing portion 42 due to temperature changes. During the puffing phase, the controller 4 can control the magnitude of the second power in real time based on the real-time changes in the electrical parameters to prevent the temperature of the susceptor 4 during the puffing phase from exceeding the maximum temperature of the susceptor 4 during the puffing phase.

[0145] In one embodiment, during the puff phase, the maximum temperature of the susceptor 4 is greater than or equal to the second Curie temperature. Because the first Curie temperature is greater than the second Curie temperature, after the temperature exceeds the second Curie temperature, within the heating temperature range of the aerosol-generating article 1, the electrical parameters of the magnetic field generator 2 substantially no longer change with temperature changes. Consequently, the controller 5 is unable to continue to control the magnitude and duration of the second power provided to the magnetic field generator 2 by the power supply 31 based on the electrical parameters of the magnetic field generator 2.

[0146] Based on this, in one example, during the puffing phase, the controller 5 is configured to control the power supply to terminate or reduce the second power provided to the magnetic field generator 2 when the temperature of the susceptor 4 reaches or is about to reach the second Curie temperature, so that after the temperature of the susceptor 4 reaches or exceeds the second Curie temperature, it begins to cool naturally, thereby reducing the temperature.

[0147] Alternatively, in one example, during the puffing phase, the controller 5 is configured to control the power supply 31 to continue to provide the second power to the magnetic field generator 2 for a preset time period when the temperature of the susceptor 4 reaches the second Curie temperature, so that the temperature of the susceptor 4 can continue to rise for a preset time period or maintain the second Curie temperature for a preset time period after reaching the second Curie temperature.

[0148] In one embodiment, the aerosol generating device further includes a detection circuit, which may be disposed on the circuit board 32 and electrically connected to the controller 5. The detection circuit is configured to detect changes in electrical parameters of the magnetic field generator 2 and then transmit the electrical parameters to the controller for receipt by the controller.

[0149] The susceptor, aerosol generating device, and aerosol-forming article provided in the embodiments of the present application can cause the susceptor 4 to generate heat at maximum power before reaching the third Curie temperature, causing the susceptor 4 and the aerosol-generating article 1 to heat rapidly from room temperature or the initial temperature to the third Curie temperature. The third Curie temperature is greater than or equal to the first temperature and less than the second temperature. Therefore, after reaching the third Curie temperature, the temperature of the susceptor 4 can be monitored based on the monotonic functional relationship between the magnetic permeability of the second susceptor 42 and its temperature within the temperature range between the first and second temperatures. This can prevent temperature overshoot while meeting complex heating requirements.

[0150] In the temperature range between the first temperature and the second temperature, as the temperature increases, the magnetic permeability and heating efficiency of the second susceptor 42 decrease.

[0151] The susceptor 4 primarily heats the aerosol-generating article 1 through the first susceptor 41. The first Curie temperature of the first susceptor 41 is greater than the second temperature. This allows the first susceptor 41 to maintain high magnetic permeability and high heating efficiency within the temperature range between the first and second temperatures, particularly when the first susceptor 41 is made of stainless steel or pure iron. Consequently, during the preheating phase, after reaching the third Curie temperature, the susceptor 4 can reach the maximum preheating temperature very quickly without overshooting. Specifically, the coordinated action of the first susceptor 41, the second susceptor 42, and the third susceptor 43 prevents temperature overshoot during the preheating phase and shortens the preheating time.

[0152] During the inhalation phase, when cold air enters the aerosol generating article 1 due to inhalation, causing the temperature of the sensor 4 to drop, the high magnetic permeability and high heating efficiency of the first sensor 41 can quickly restore the temperature of the sensor 4 to a preset temperature corresponding to the corresponding time of the inhalation phase, so that the heating temperature of the sensor 4 can quickly restore to a heating curve that meets the inhalation phase.

[0153] If the temperature during the puffing phase drops below the third Curie temperature due to puffing or other reasons, the susceptor 4 can be heated again at maximum power to quickly raise the temperature of the susceptor 4 to the third Curie temperature, and then continue to heat at a relatively low power to quickly restore the temperature of the susceptor 4 to the preset temperature corresponding to the current time of the puffing phase without overshooting.

[0154] Therefore, the first sensor 41 , the second sensor 42 and the third sensor 43 cooperate with each other to prevent temperature overshoot during the puffing stage and shorten the temperature recovery time during the puffing stage.

[0155] Therefore, if the susceptor 4 includes the second susceptor 42 and the third susceptor 43 but does not include the first susceptor 41, the speed at which the susceptor 4 heats from the third Curie temperature to the maximum temperature of the preheating stage without overshooting the temperature during the preheating stage will be seriously affected, and the speed at which the susceptor 4 heats up after the temperature drops in the temperature range between the first and second temperatures during the inhalation stage will be seriously affected.

[0156] In the susceptor, aerosol generating device, and aerosol-forming article provided by the embodiments of the present application, the third Curie temperature of the third susceptor 43 is greater than or equal to the first temperature.

[0157] On the one hand, after reaching the third Curie temperature, the temperature can be made to be within the range where there is a monotonic function relationship between the magnetic permeability of the second susceptor 42 and its temperature, so that the second susceptor 42 can seamlessly monitor the temperature of the sensor 4 after the third Curie temperature.

[0158] On the other hand, when the temperature of the second susceptor 42 approaches but has not yet reached the first temperature, its magnetic permeability begins to change with increasing temperature. When the temperature of the second susceptor 42 is slightly greater than the first temperature, the increase in its magnetic permeability with temperature may not be significant enough. Therefore, a very high-precision detection circuit is required to clearly identify the change in the electrical parameters of the magnetic field generator 2 based on the magnetic permeability of the second susceptor 42 at the first temperature, which can easily lead to inaccurate identification or increased costs. When the third susceptor 43 reaches the third Curie temperature, its magnetic permeability undergoes a drastic mutation, and the resulting change in the electrical parameters of the magnetic field generator 2 is easily detected and identified. Then, starting from the third Curie temperature, the detection circuit begins to detect the change in the electrical parameters of the magnetic field generator 2 at a preset frequency or in real time. The controller controls the power based on the change in the electrical parameters of the magnetic field generator 2, and thus controls the temperature of the susceptor 4.

[0159] Therefore, the first susceptor 41, the second susceptor 42, and the third susceptor 43 cooperate with each other to increase the heating rate of the susceptor 4 and clearly utilize the monotonic functional relationship between the magnetic permeability of the second susceptor 42 and its temperature in the temperature range between the first temperature and the second temperature to monitor the temperature of the susceptor 4, so that the temperature of the susceptor 4 conforms to its heating curve and the susceptor 4 meets more complex heating requirements.

[0160] Therefore, if the sensor 4 includes the first sensor 41 and the third sensor 43 but does not include the third sensor 43, it will not only affect the temperature rise rate of the sensor 4 in the preset stage, but also the inability to clearly identify the first temperature will lead to premature or delayed regulation of the power output by the magnetic field generator 2, affecting the heating effect of the aerosol generating article 1 or increasing the control cost of the aerosol generating device.

[0161] The susceptor, aerosol generating device, and aerosol-forming product provided in the embodiments of the present application can prevent the temperature of the susceptor 4 from overshooting before reaching the third Curie temperature, even if the temperature of the susceptor 4 is not monitored, because the magnetic permeability of the third sensing portion 43 suddenly changes when the third Curie temperature is reached. This can prevent the aerosol-generating product 1 from being burnt and the aerosol released by the aerosol-generating product from burning the mouth. Moreover, after the temperature of the first sensing portion 41 exceeds the third Curie temperature, the temperature of the susceptor 4 can be monitored within the temperature range between the first temperature and the second temperature based on the monotonic function relationship between the magnetic permeability of the second sensing portion 42 and its temperature, so that the temperature of the susceptor 4 can be controllably continued to increase or controlled to be maintained stable, thereby meeting the more complex heating requirements of the aerosol-generating product 1.

[0162] It should be noted that the specification and drawings of this application provide preferred embodiments of the present application, but are not limited to the embodiments described in this specification. Furthermore, it is possible for a person skilled in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A sensor, characterized in that: include: a first sensing portion for generating heat when penetrated by a varying magnetic field to heat the aerosol-generating article, the first sensing portion having a first Curie temperature; a second sensing portion connected to the first sensing portion to sense a temperature of the first sensing portion, wherein the second sensing portion is configured to have a temperature range between the first temperature and the second temperature, and a monotonic function relationship exists between the magnetic permeability of the second sensing portion and its temperature; and a third sensing portion connected to the first sensing portion to sense the temperature of the first sensing portion, the third sensing portion having a third Curie temperature; The first Curie temperature is greater than the second temperature, and the third Curie temperature is greater than or equal to the first temperature and less than the second temperature.

2. The sensor according to claim 1, wherein At least two of the first sensing portion, the second sensing portion and the third sensing portion are stacked in a thickness direction of the susceptor.

3. The susceptor according to claim 1, wherein The second sensing portion is disposed between the first sensing portion and the third sensing portion; or The first sensing portion is disposed between the second sensing portion and the third sensing portion.

4. The susceptor according to claim 1, wherein The susceptor further includes a heat-conducting connecting portion, at least a portion of which is disposed between the second sensing portion and the first sensing portion, and connects the second sensing portion and the first sensing portion.

5. The susceptor according to claim 1, wherein The first sensing portion comprises stainless steel or pure iron, the second sensing portion comprises permalloy, and the third sensing portion comprises a metal having a nickel content greater than or equal to 90% by mass.

6. The susceptor according to claim 1, wherein The thickness of the first sensing portion is greater than or equal to the thickness of the second sensing portion, and the thickness of the second sensing portion is greater than or equal to the thickness of the third sensing portion; or A ratio of a thickness of the first sensing portion to a thickness of the second sensing portion is approximately 3; or The thickness of the first sensing portion is greater than the sum of the thicknesses of the second sensing portion and the third sensing portion; or The volume of the first sensing portion is greater than or equal to the volume of the second sensing portion, and the volume of the second sensing portion is greater than or equal to the volume of the third sensing portion; or The mass of the first sensing portion is greater than or equal to the mass of the second sensing portion, and the mass of the second sensing portion is greater than or equal to the mass of the third sensing portion.

7. The susceptor according to claim 1, wherein The second sensing portion is further configured such that, at least in a temperature range between a first temperature and a second temperature, a rate of change of the magnetic permeability of the second sensing portion with temperature change is greater than a rate of change of the magnetic permeability of the first sensing portion with temperature change.

8. The susceptor according to claim 1, wherein The second sensing portion has a second Curie temperature, which is greater than the second temperature and less than the first Curie temperature.

9. An aerosol generating device for heating an aerosol generating product, characterized in that The aerosol generating device or the aerosol generating article comprises the susceptor according to any one of claims 1 to 8; The aerosol generating device comprises: power supply; a magnetic field generator for generating a varying magnetic field; and a controller configured to control the power supply to provide a first power to the magnetic field generator before the temperature of the susceptor reaches the third Curie temperature, obtain electrical parameters of the magnetic field generator after the temperature of the susceptor reaches the third Curie temperature, and control the power supply to provide a second power to the magnetic field generator based on the electrical parameters; The first power is greater than the second power.

10. The aerosol generating device according to claim 9, wherein The duty cycle of the first power is greater than the duty cycle of the second power; or The voltage of the first power is greater than the voltage of the second power; or The current of the first power is greater than the current of the second power; or The first power includes full-wave power output by the power supply to the magnetic field generator, and the second power includes chopped power output by the power supply to the magnetic field generator.

11. The aerosol generating device according to claim 9, wherein The heating of the aerosol-generating article by the aerosol-generating device includes a preheating stage, and the third Curie temperature is less than or equal to the highest temperature of the preheating stage.

12. The aerosol generating device according to claim 9, wherein The heating of the aerosol-generating article by the aerosol-generating device includes a puffing phase, during which the maximum operating temperature of the susceptor is less than or equal to the second temperature.

13. The aerosol generating device according to claim 9, wherein The second sensing portion has a second Curie temperature, and the second Curie temperature is greater than or equal to the second temperature; The heating of the aerosol-generating article by the aerosol-generating device includes a puffing phase, during which the maximum temperature of the susceptor is greater than or equal to the second Curie temperature.

14. The aerosol generating device according to claim 13, wherein During the inhalation phase, the controller is configured to control the power supply to continue providing the second power to the magnetic field generator for a preset period of time, or to control the power supply to terminate or reduce the second power provided to the magnetic field generator when the temperature of the susceptor reaches the second Curie temperature.

15. An aerosol-forming article, characterized in that A susceptor according to any one of claims 1 to 8, further comprising an aerosol-forming substrate, wherein the susceptor is at least partially disposed in the aerosol-forming substrate.

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