Aerosol generating device and aerosol generating article, heat generating assembly and susceptor

Abstract

The present invention relates to an aerosol generating device and its aerosol-generating article, heat-generating assembly, and susceptor. The susceptor includes a heat-generating layer, a thermally conductive layer, and a temperature-sensitive layer. The heat-generating layer is adapted to generate heat under a changing magnetic field. The thermally conductive layer is disposed between the heat-generating layer and the temperature-sensitive layer and is adapted to conduct heat generated by the heat-generating layer to the temperature-sensitive layer. The temperature-sensitive layer is adapted to change its magnetic permeability based on the temperature of the susceptor. The heat-generating assembly includes a susceptor and a coil surrounding the outside of the susceptor. The aerosol-generating article includes an aerosol-generating matrix and a susceptor. The aerosol generating device includes a power assembly and the heat-generating assembly or aerosol-generating article. In the present invention, the temperature-sensitive layer changes its magnetic permeability based on the temperature of the susceptor, and a thermally conductive layer is added between the temperature-sensitive layer and the heat-generating layer. A multilayer susceptor obtained by combining different materials has a simple structure, simplifies temperature measurement using the susceptor, is highly corrosion-resistant, enables accurate temperature control using the susceptor, and contributes to improving heat generation efficiency.

Description

[Technical Field]

[0001] The present invention relates to the technical field of atomization, and in particular to an aerosol generating device and its aerosol generating article, heat generating assembly and susceptor. [Background technology]

[0002] Currently, the heating methods of non-combustion heating devices on the market are mainly resistance heating and electromagnetic heating. Of these, electromagnetic heaters have a greater degree of freedom in the placement of the heating element than resistance heaters, and whether they are pin-type, chip-type, or coil-type, they require temperature measurement wires for temperature feedback in order to accurately control the temperature change range of the heating element, which reduces the flexibility of the application of the heating element.

[0003] For electromagnetic heating, pin-type, chip-type, or circular heating elements are used. Heating element The temperature of the heating element is fed back by printing a temperature measurement film on the outer surface and connecting it to the board with lead wires. This method basically uses the properties of other materials to indirectly reflect the temperature parameters of the heating element, which are mixed with various uncertainties. For example, heat conduction between the temperature measurement film and the heating element slows down the heat exchange, but the temperature measurement film itself has heat capacity, and at the same time Heat transfer Some energy is consumed during the process. process The shape of the heating element is limited by the installation and protection methods, and the fixing of the heating element becomes more complicated, which increases the construction and fixed costs. In addition, the construction absorbs more energy from the heating element, which reduces the efficiency of the heating element. Summary of the Invention [Problem to be solved by the invention]

[0004] In view of the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an aerosol generating device and its aerosol generating article, heat generating assembly and susceptor that are simple in structure and have high heat generation efficiency.

[0005] The technical solution adopted by the present invention to solve the technical problem is: A susceptor for an aerosol generating device, comprising: The susceptor includes a heat generating layer, a heat conducting layer, and a temperature sensitive layer, wherein the heat generating layer is adapted to generate heat under the action of a changing magnetic field, the heat conducting layer is disposed between the heat generating layer and the temperature sensitive layer, the heat conducting layer is adapted to conduct the heat generated by the heat generating layer to the temperature sensitive layer, and the temperature sensitive layer is adapted to change the temperature of the susceptor based on the temperature of the susceptor. The temperature-sensitive layer (4) A susceptor is constructed that is used to change the magnetic permeability.

[0006] Preferably, within a preset temperature range, the magnetic permeability of the temperature-sensitive layer changes in response to changes in temperature.

[0007] Preferably, the preset temperature range is equal to or greater than a first temperature value and equal to or less than a second temperature value, the second temperature value being lower than the Curie point temperature of the material of the temperature-sensitive layer.

[0008] Preferably, within the preset temperature range, the magnetic permeability of the temperature-sensitive layer gradually increases as the temperature gradually increases.

[0009] Preferably, within the preset temperature range, the magnetic permeability of the temperature-sensitive layer gradually decreases as the temperature gradually increases.

[0010] Preferably, the material of the temperature-sensitive layer includes a soft magnetic material.

[0011] Preferably, the material of the temperature sensitive layer includes 1j85 material.

[0012] Preferably, the material of the temperature-sensitive layer has a Curie point temperature of less than 800°C.

[0013] Preferably, the material of the heat generating layer includes a ferromagnetic material, and the Curie point temperature of the material of the heat generating layer is higher than the Curie point temperature of the material of the temperature sensitive layer.

[0014] Preferably, the material of the heat generating layer includes a non-magnetic material.

[0015] Preferably, the material of the heat conductive layer includes a diamagnetic material.

[0016] Preferably, the material of the heat conduction layer includes any one or more of gold, silver, copper, and graphene.

[0017] Preferably, the susceptor has a sheet-like shape, and includes a sheet-like first main body portion and a first pointed portion connected to the tip of the first main body portion.

[0018] Preferably, the heat generating layer, the heat conducting layer, and the temperature sensitive layer are parallel to one another, and the three are stacked on top of one another.

[0019] Preferably, the ratio of the thicknesses of the heat generating layer, the heat conducting layer and the temperature sensitive layer is 5:1:4.

[0020] Preferably, the susceptor is tubular in shape.

[0021] Preferably, the susceptor has a cylindrical shape, and includes a cylindrical second main body portion and a second pointed portion connected to the tip of the second main body portion.

[0022] Preferably, the thermally conductive layer and the temperature sensitive layer are at least partially embedded in the heat generating layer, the thermally conductive layer separating the temperature sensitive layer and the heat generating layer.

[0023] Preferably, the ratio of the thicknesses of the heat generating layer, the heat conducting layer and the temperature sensitive layer is 6:1:3.

[0024] Preferably, the heat conductive layer is provided in two or more layers.

[0025] Preferably, the temperature-sensitive layer is provided in two or more layers.

[0026] The present invention also provides a heat generating assembly including the susceptor described above and a coil surrounding the susceptor for generating a magnetic field.

[0027] The present invention also provides an aerosol-generating article comprising an aerosol-generating matrix and a susceptor as described above for heating the aerosol-generating matrix.

[0028] The present invention also provides an aerosol generating device comprising a power supply assembly and the heat generating assembly or the aerosol generating article described above, wherein the power supply assembly is used to drive the susceptor to generate heat. [Effects of the Invention]

[0029] The present invention provides the following beneficial effects: In the present invention, the temperature-sensitive layer (4) changes its permeability based on the susceptor temperature, and a thermally conductive layer with high thermal conductivity is added between the temperature-sensitive layer and the heat-generating layer. The multi-layer susceptor obtained by combining different materials has a simple structure, simplifies temperature measurement using the susceptor, is highly corrosion-resistant, and enables accurate temperature control using the susceptor, contributing to improved heat generation efficiency. [Brief explanation of the drawings]

[0030] The present invention will now be further described with reference to the drawings and examples. [Figure 1] 1 is a cross-sectional view of an embodiment of a susceptor of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of another embodiment of a susceptor of the present invention. [Figure 3] FIG. 4 is a cross-sectional view of another embodiment of the susceptor of the present invention. [Figure 4] FIG. 2 is a schematic diagram showing the magnetic permeability and temperature change of the susceptor material of the present invention. [Figure 5] 1 is a structural schematic diagram of a first embodiment of a susceptor of the present invention. [Figure 6] FIG. 6 is an exploded view of the structure of the susceptor of FIG. 5. [Figure 7] FIG. 4 is a structural schematic diagram of a second embodiment of the susceptor of the present invention. [Figure 8] FIG. 8 is a structural schematic diagram of another embodiment of FIG. 7. [Figure 9] FIG. 4 is a structural schematic diagram of a third embodiment of the susceptor of the present invention. [Figure 10] FIG. 10 is a structural schematic diagram of another embodiment of FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0031] In order to more clearly understand the technical features, objectives and effects of the present invention, specific embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the orientations or positional relationships indicated by "front", "rear", "up", "down", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are configured and operated in a specific orientation based on the orientations or positional relationships shown in the drawings, and are intended to facilitate the description of the present technical solution, but do not indicate that the indicated devices or elements must have a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] Furthermore, unless otherwise expressly specified and limited, terms such as "attach," "couple," "connect," "fix," and "provide" should be understood in a broad sense, for example, to mean a fixed connection, a detachable connection, or integration, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two elements, or an interactive relationship between two elements. When an element is said to be "above" or "below" another element, the element may be "directly" or "indirectly" located on the other element, or there may be one or more intervening elements. Terms such as "first," "second," and "third" are used to facilitate the description of the technical solution and should not be understood to indicate or imply relative importance or the number of technical features shown. Therefore, a feature qualified as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features. The specific meaning of the above terms in the present invention can be understood by those skilled in the art depending on the context.

[0033] In the following description, for purposes of explanation and not limitation, specific details are set forth, such as specific system configurations and techniques, to provide a thorough understanding of embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments that do not include these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0034] The core of the problem that exists in electromagnetic heating, which is the subject of the present invention, is mainly the susceptor itself.

[0035] The basic principle of electromagnetic heating is that a changing current passes through an electromagnetic coil to create a changing magnetic field, which acts on the susceptor, generating eddy currents in the susceptor body and converting them into heat. An actual electromagnetic coil body has certain attribute parameters, such as inductance, AC resistance, linear resistance, and quality factor. When a susceptor is placed within the electromagnetic coil's influence range, these parameters, except for linear resistance, vary depending on the susceptor's position, size and material, volume within the influence range, and temperature within the influence range.

[0036] The magnetic properties of the material of the electromagnetic heating susceptor directly affect the heating rate and efficiency of the susceptor. For metals with better magnetic properties, the material of the susceptor of this invention is a soft magnetic material. The key characteristic parameter for describing soft magnetic materials is magnetic permeability. Research has shown that changes in the characteristic parameters of the electromagnetic coil are directly related to the susceptor's magnetic permeability.

[0037] For typical susceptors, the key limiting factor in their flexible use and configuration is the need for external temperature measurement. However, some soft magnetic materials have a permeability that changes with the temperature of the body. This allows temperature changes to be converted into permeability changes, which are then converted into electrical parameter changes in the coil itself, and then temperature changes to be converted into electrical parameter changes in the coil itself. Simply measuring the change in the coil's electrical parameter allows the temperature value of the heat generated to be calculated from the measurement, forming a complete temperature feedback link for controlling the susceptor temperature.

[0038] For soft magnetic materials within the temperature control range, grade 430 etc. Model number Stainless steel not only has high heat generation efficiency, but also has strong corrosion resistance and is easy to protect the surface, so it is possible to achieve different purposes. Taking these advantages into consideration, it is possible to form a susceptor for measuring temperature by combining these two materials. Because the two materials are combined, the thermal conductivity is lower than that of precious metals such as copper and silver, and the temperature is sensitive. layerThe soft magnetic material used as the susceptor does not heat up as quickly as grade 430 / 410 stainless steel. To characterize the temperature of the entire composite susceptor, the temperature-sensitive material must absorb the heat from the heat-generating material and distribute it uniformly throughout, allowing for better feedback of temperature changes. Based on this, the present invention simplifies temperature measurement by adding a layer of highly thermally conductive material between the temperature-sensitive and heat-generating materials.

[0039] FIG. 1 shows a susceptor 1 for an aerosol generating device of the present invention, which includes three layers: a heat generating layer 2, a heat conducting layer 3, and a temperature sensitive layer 4. The heat generating layer 2 is used to generate heat under the action of a changing magnetic field. The heat conducting layer 3 is disposed between the heat generating layer 2 and the temperature sensitive layer 4. The heat generating layer 2 is in contact with the heat conducting layer 3. The heat conducting layer 3 is used to conduct the heat generated by the heat generating layer 2 to the temperature sensitive layer 4. The temperature sensitive layer 4 changes the temperature of the susceptor 1 based on the temperature of the susceptor 1. The temperature-sensitive layer 4 It is used to change magnetic permeability.

[0040] As shown in FIG. 1 , in some embodiments, the susceptor 1 has a three-layer laminated structure. Specifically, the heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 are parallel to each other and are laminated together. The heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 may have approximately the same size to facilitate lamination. As shown in FIG. 2 , in other embodiments, the susceptor 1 has a three-layer nested structure. The heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 are nested together. The heat generating layer 2 functions as a substrate, the thermally conductive layer 3 is embedded in a portion of the heat generating layer 2, and the temperature sensitive layer 4 is embedded in the thermally conductive layer 3. The thermally conductive layer 3 completely separates the temperature sensitive layer 4 from the heat generating layer 2. That is, a first slot is opened in the heat generating layer 2, and the thermally conductive layer 3 is embedded in the first slot of the heat generating layer 2. Also, Thermal Conduction Layer 3 A second slot is drilled in the heat conducting layer 3, and the temperature sensitive layer 4 is embedded in the second slot in the heat conducting layer 3, the diameter of the first slot being larger than the diameter of the second slot, and thus the heat conducting layer 3 separates the temperature sensitive layer 4 from the heat generating layer 2.

[0041] In some embodiments, the heat generating layer 2, the heat conducting layer 3, and the temperature sensitive layer 4 may have other forms of composite structures. The temperature sensitive layer 4 may be located in the center, the heat conducting layer 3 may be located outside the temperature sensitive layer 4, and the temperature sensitive layer 4 may be completely covered by the heat conducting layer 3. Alternatively, the heat generating layer 2 may be located outside the heat conducting layer 3, and the heat conducting layer 3 may be completely covered by the heat generating layer 2. In other embodiments, the size of the heat conducting layer 3 may be different from the size of the temperature sensitive layer 4. That is, the heat conducting layer 3 may only partially cover the surface that comes into contact with the temperature sensitive layer 4.

[0042] In some embodiments, the susceptor may have two or more temperature-sensitive layers 4, and the susceptor may also have two or more thermally conductive layers 3, but these are not limited thereto. As shown in Fig. 3, the susceptor includes two temperature-sensitive layers 4, two thermally conductive layers 3, and one heat-generating layer 2. One of the temperature-sensitive layers 4 is covered by one of the thermally conductive layers 3 and is provided on one side of the heat-generating layer 2, and the other of the temperature-sensitive layers 4 is covered by the other thermally conductive layer 3 and is provided on the other side of the heat-generating layer 2. There may be a certain gap between two adjacent temperature-sensitive layers 4.

[0043] Within a set temperature range, the magnetic permeability of the temperature-sensitive layer 4 changes in response to changes in temperature. For A relationship between the temperature change characteristics of the same material and the change in magnetic permeability is established, and both relationships may be linear or nonlinear. The preset temperature range may be above a first temperature value and below a second temperature value, which is lower than the Curie point temperature of the material of the temperature-sensitive layer 4. Within this preset temperature range, the magnetic permeability of the temperature-sensitive layer 4 changes with temperature, so each magnetic permeability can have a corresponding temperature value, allowing the temperature change to be obtained from the change in magnetic permeability.

[0044] In some embodiments, within a preset temperature range, the magnetic permeability of the temperature-sensitive layer 4 may gradually decrease as the temperature gradually increases, while in other embodiments, within a preset temperature range, the magnetic permeability of the temperature-sensitive layer 4 may gradually increase as the temperature gradually increases.

[0045] In some embodiments, the material of the temperature-sensitive layer 4 may be a functional soft magnetic material, and the soft magnetic material has a Curie temperature point. The usable range of the aerosol-generating matrix is within 500°C. Research on various soft magnetic materials has shown that some materials do not show a significant change in magnetic permeability with temperature at temperatures below their Curie temperature points. The temperature Only at temperatures close to the Curie point Permeability The change with temperature becomes clear. However, there are also materials whose magnetic permeability gradually decreases with increasing temperature at temperatures lower than their Curie temperature. This change in parameter characteristics is precisely what is required for the practical application of the present invention. Generally, the Curie point 100 of the material of the temperature-sensitive layer 4 is less than 800°C, and the Curie point 100 of the material used for the temperature-sensitive layer 4 is preferably approximately 400°C. As shown in FIG. 4, specifically, the magnetic permeability of the material of the temperature-sensitive layer 4 has a first temperature change point 101 and a second temperature change point 102. Both the first temperature change point 101 and the second temperature change point 102 are lower than the Curie point 100 of the material of the temperature-sensitive layer 4. The temperature corresponding to the first temperature change point 101 may be referred to as the first temperature value, and the temperature corresponding to the second temperature change point 102 may be referred to as the second temperature value. The magnetic permeability of the soft magnetic material of the temperature-sensitive layer 4 hardly changes until the temperature of the soft magnetic material of the temperature-sensitive layer 4 reaches the first temperature change point 101. When the temperature of the soft magnetic material of the temperature-sensitive layer 4 reaches the first temperature change point 101 and continues to rise, the magnetic permeability of the soft magnetic material of the temperature-sensitive layer 4 begins to gradually and regularly decrease as the temperature rises, and when the temperature rises to the second temperature change point 102, the rate of change of the magnetic permeability of the soft magnetic material of the temperature-sensitive layer 4 begins to decrease, and when the temperature reaches the Curie point 100 of the soft magnetic material of the temperature-sensitive layer 4, the magnetic permeability decreases to zero, at which point the material of the temperature-sensitive layer 4 completely loses its magnetism.

[0046] In some embodiments, the material of the heating layer 2 includes a ferromagnetic material such as iron or an iron alloy, and the iron alloy may be grade 410 stainless steel, grade 420 stainless steel, or grade 430 stainless steel. Among these, grade 430 stainless steel is a ferromagnetic material with a Curie temperature above 400°C. If the material of the heating layer 2 is a ferromagnetic material, the Curie point temperature of the material of the heating layer 2 must be higher than the Curie point temperature of the material of the temperature-sensitive layer 4. Specifically, the material of the heating layer 2 may be a non-magnetic material such as aluminum.

[0047] In some embodiments, the thermally conductive layer 3 may be made of a metallic material with high thermal conductivity, such as common metals like gold, silver, or copper, or a non-metallic material with higher thermal conductivity, such as graphene. Therefore, the material of the thermally conductive layer 3 may include any one or more of gold, silver, copper, and graphene. In some embodiments, the material of the thermally conductive layer 3 may include a diamagnetic material, so that the thermally conductive layer 3 generates less heat in a changing magnetic field, and most of the heat received by the temperature-sensitive layer 4 comes from the heat generated by the heat-generating layer 2 conducted from the thermally conductive layer 3.

[0048] In some embodiments, the material of the temperature sensitive layer 4 may include 1j85 material. 1j85 material, also known as 1j85 permalloy, is a nickel-iron magnetic alloy with the properties of high magnetic permeability and low coercivity.

[0049] The shape of the susceptor 1 may be a sheet, a tube, a cylinder, or the like, but is not limited thereto.

[0050] The present invention also provides a heat generation assembly including the susceptor 1 described above and a coil for generating a magnetic field surrounding the susceptor 1. In some embodiments, the heat generation assembly may further include a fixing base 5 provided below the susceptor 1 for fixing the susceptor 1. The present invention also provides an aerosol-generating article including an aerosol-generating matrix and the susceptor 1 described above for heating the aerosol-generating matrix.

[0051] The present invention also provides Power Assembly and An aerosol-generating device may be constructed that includes the heat generating assembly or the aerosol-generating article described above, and the power supply assembly may be used to drive the susceptor to generate heat and may include a battery. The aerosol-generating device may include a casing, a heat generating assembly provided within the casing, and a battery provided within the casing and electrically connected to two electrode leads of the heat generating assembly. The aerosol-generating matrix may be inserted into the casing from the top. The top end of the heat generating assembly is inserted into the aerosol-generating matrix, and after being powered on and heated, the aerosol-generating matrix is heated and baked, forming an aerosol that can be inhaled by the user.

[0052] FIG. 5 shows a susceptor 1 according to a first embodiment of the present invention. In this embodiment, the susceptor 1 is sheet-shaped and includes a sheet-shaped first main body 11 and a first pointed portion 12 connected to the tip of the first main body 11. The first main body 11 has a rectangular sheet structure, and the first pointed portion 12 has a triangular sheet structure. The length of the base of the first pointed portion 12 may be the same as the length of the short side of the first main body 11, and the first main body 11 and the first pointed portion 12 may be integrally formed. As shown in FIG. 6, in this embodiment, the susceptor 1 has a three-layer laminate structure, in which the heat-generating layer 2, the heat-conducting layer 3, and the temperature-sensitive layer 4 are parallel to each other and are laminated on top of each other.

[0053] In this embodiment, the thickness ratio of the heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 may be 5:1:4. In one embodiment, the total thickness of the susceptor 1 is 0.5 mm, with the heat generating layer 2 accounting for 50%, the temperature sensitive layer 4 for 40%, and the thermally conductive layer 3 for 10%. After molding, the three layers are parallel to each other. Specifically, the heat generating layer 2 is made of grade 430 stainless steel, the temperature sensitive layer 4 is made of 1J85 material, and the thermally conductive layer 3 is made of copper.

[0054] To meet the electromagnetic environment requirements for the skin effect of the susceptor 1, the susceptor 1 may be formed into a 12mm x 4mm sheet-like part using a three-layer parallel composite material pressed according to the above dimensions. One end of the susceptor 1 is fixed to the fixing base 5 of the aerosol generator, and the other end is chamfered to facilitate the insertion of the aerosol-generating matrix. The Curie point of the material of the temperature-sensitive layer 4 is approximately 400°C. The susceptor 1 is placed at the induction center of the electromagnetic coil. After the aerosol-generating matrix is inserted, a high-frequency current is connected to the coil. When the temperature of the susceptor 1 reaches 150°C, the temperature of the first temperature change point 101, the magnetic permeability of the temperature-sensitive layer 4 begins to gradually and regularly decrease, and the electrical parameters of the coil change accordingly. The current temperature of the susceptor 1 can be estimated by acquiring the electrical parameters through a circuit and performing data processing and matching. The AC current has certain characteristics that can be used to detect the temperature of the susceptor 1 in real time. Typically, the aerosol occurrence When heating the matrix, the target temperature of the susceptor 1 is approximately 300°C. This target temperature is lower than the temperature of the second temperature change point 102 of the material. For example, the temperature of the second temperature change point 102 is 380°C. Therefore, during the process of heating the susceptor 1 from the first temperature change point 101 to the target temperature of 300°C, the relationship between the temperature and permeability of the susceptor 1 changes regularly, ensuring a one-to-one correspondence between temperature and permeability. Therefore, the permeability of the material of the temperature-sensitive layer 4 changes regularly with temperature, and therefore, temperature values corresponding to each permeability within this temperature range can be obtained, and temperature control accuracy within 1°C can be achieved.

[0055] FIG. 7 shows a susceptor 1 according to a second embodiment of the present invention. The shape of the susceptor 1 may be a hollow tube. In this embodiment, the susceptor 1 has a three-layer nested structure in which a heat generating layer 2, a thermally conductive layer 3, and a temperature sensitive layer 4 are nested, and the thermally conductive layer 3 and the temperature sensitive layer 4 are at least partially embedded in the heat generating layer 2, and the thermally conductive layer 3 separates the temperature sensitive layer 4 from the heat generating layer 2. In some embodiments, the susceptor 1 Temperature-sensitive layer 4 The heat conductive layer of the susceptor may be provided in two or more layers. 3As shown in FIG. 8, the susceptor may be provided in two or more layers, but this is not limited thereto. 1 is a three-layer nested composite material including two temperature-sensitive layers 4, two heat-conducting layers 3, and one heat-generating layer 2 shown in FIG.

[0056] In this embodiment, the thickness ratio of the heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 may be 6:1:3. In one embodiment, the total thickness of the susceptor 1 is 0.5 mm, with the heat generating layer 2 accounting for 60%, the temperature sensitive layer 4 accounting for 30%, and the thermally conductive layer 3 accounting for 10%. Specifically, the heat generating layer 2 is made of grade 430 stainless steel, the temperature sensitive layer 4 is made of 1J85 material, and the thermally conductive layer 3 is made of copper.

[0057] In accordance with the electromagnetic environment requirements for the skin effect of the susceptor 1, the susceptor 1 may be formed into a tubular part with a diameter of 7 mm and a length of 12 mm using three layers of nested composite material pressed using the above method, with one end fixed to a guide member to facilitate the insertion of the aerosol-generating matrix. The Curie point of the material of the temperature-sensitive layer 4 is approximately 400°C. The susceptor 1 is placed at the induction center of an electromagnetic coil. After the aerosol-generating matrix is inserted, a high-frequency current is connected to the coil. When the temperature of the susceptor 1 reaches 150°C, the temperature of the first temperature change point 101, the magnetic permeability of the temperature-sensitive layer 4 begins to gradually and regularly decrease, and the electrical parameters of the coil change accordingly. The electrical parameters can be acquired through a circuit, and the current temperature of the susceptor 1 can be estimated by performing data processing and matching. The AC current has certain characteristics that can be used to detect the temperature of the susceptor 1 in real time. Typically, the aerosol occurrenceWhen heating the matrix, the target temperature of the susceptor 1 is approximately 300°C. This target temperature is lower than the temperature of the second temperature change point 102 of the material. For example, the temperature of the second temperature change point 102 is 380°C. Therefore, in the process of heating the susceptor 1 from the first temperature change point 101 to the target temperature of 300°C, the relationship between the temperature and permeability of the susceptor 1 changes regularly, ensuring a one-to-one correspondence between temperature and permeability. Therefore, the permeability of the material of the temperature-sensitive layer 4 changes regularly with temperature, and temperature control accuracy within 1°C can be achieved.

[0058] 9 shows a susceptor 1 according to a third embodiment of the present invention. The shape of the susceptor 1 may be a hollow cylinder, and this susceptor 1 is a roughly needle-shaped susceptor, including a cylindrical second main body portion 13 and a second pointed portion 14 connected to the tip of the second main body portion 13. The second main body portion 13 has a cylindrical structure, and the second pointed portion 14 has a conical structure, and the bottom area of the second pointed portion 14 is the same as the top area of the second main body portion 13. The second main body portion 13 and the second pointed portion 14 may be integrally formed. The shape of the susceptor 1 is not limited here, but it is understood that it may be other shapes such as a rectangle or a rod. Specifically, in this embodiment, the susceptor 1 may be configured with a three-layer nested structure in which the heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 are nested within each other, with the thermally conductive layer 3 and the temperature sensitive layer 4 being at least partially embedded in the heat generating layer 2, and the thermally conductive layer 3 separating the temperature sensitive layer 4 from the heat generating layer 2. In some embodiments, the susceptor 1 Temperature-sensitive layer 4 The heat conductive layer of the susceptor may be provided in two or more layers. 3 As shown in FIG. 10, the susceptor may have two or more layers. 1 is a three-layer nested composite material including two temperature-sensitive layers 4, two heat-conducting layers 3, and one heat-generating layer 2 shown in FIG.

[0059] In this embodiment, the thickness ratio of the heat generating layer 2, the thermally conductive layer 3, and the temperature sensitive layer 4 may be 6:1:3. In one embodiment, the total thickness of the susceptor 1 is 0.5 mm, with the heat generating layer 2 accounting for 60%, the temperature sensitive layer 4 accounting for 30%, and the thermally conductive layer 3 accounting for 10%. Specifically, the heat generating layer 2 is made of grade 430 stainless steel, the temperature sensitive layer 4 is made of 1J85 material, and the thermally conductive layer 3 is made of copper.

[0060] According to the design requirements of the needle-shaped susceptor, the susceptor 1 may be a needle-shaped member with a diameter of 2 mm and a length of 12 mm, made of three layers of nested composite material pressed using the above method. One end of the susceptor is fixed to the fixing base 5 of the aerosol generator, and the other end is chamfered to facilitate the insertion of the aerosol-generating matrix. The Curie point of this material is approximately 400°C. The susceptor 1 is placed at the induction center of an electromagnetic coil. After the aerosol-generating matrix is inserted, a high-frequency current is connected to the coil. When the temperature of the susceptor 1 reaches 150°C, the temperature of the first temperature change point 101, the magnetic permeability of the temperature-sensitive layer 4 begins to gradually and regularly decrease, and the electrical parameters of the coil change accordingly. The current temperature of the susceptor 1 can be estimated by acquiring the electrical parameters through a circuit and performing data processing and matching. The AC current has certain characteristics that can be used to detect the temperature of the susceptor 1 in real time. Typically, the aerosol occurrence When heating the matrix, the target temperature of the susceptor 1 is approximately 300°C. This target temperature is lower than the temperature of the second temperature change point 102 of the material. For example, the temperature of the second temperature change point 102 is 380°C. Therefore, in the process of heating the susceptor 1 from the first temperature change point 101 to the target temperature of 300°C, the relationship between the temperature and permeability of the susceptor 1 changes regularly, ensuring a one-to-one correspondence between temperature and permeability. Therefore, the permeability of the material of the temperature-sensitive layer 4 changes regularly with temperature, and temperature control accuracy within 1°C can be achieved.

[0061] The susceptor of the present invention adds a thermally conductive layer with high thermal conductivity between the temperature-sensitive layer and the heat-generating layer, and also combines different materials to create a multi-layer susceptor. Because the susceptor combines a soft magnetic material and a ferromagnetic material, it has a simple structure, simplifies temperature measurement using the susceptor, and reduces manufacturing costs compared to susceptors using a single soft magnetic functional material. Compared to soft magnetic materials within the temperature control range, stainless steels such as 430 not only have high heating efficiency, but also have high corrosion resistance and are easy to protect their surfaces, allowing for accurate temperature control using the susceptor and contributing to improved heating efficiency.

[0062] It should be understood that the above examples merely illustrate preferred embodiments of the present invention, and although the descriptions are relatively specific and detailed, they should not be understood as limiting the scope of the present invention. Those skilled in the art can freely combine the above technical features and make some modifications and improvements without departing from the concept of the present invention, all of which fall within the scope of the present invention. Therefore, all equivalent variations and modifications made in accordance with the claims of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A susceptor for an aerosol generating device, comprising: A susceptor comprising a heat generating layer (2), a heat conducting layer (3), and a temperature sensitive layer (4), wherein the heat generating layer (2) is used to generate heat under the action of a changing magnetic field, the heat conducting layer (3) is provided between the heat generating layer (2) and the temperature sensitive layer (4), the heat conducting layer (3) is used to conduct the heat generated by the heat generating layer (2) to the temperature sensitive layer (4), and the temperature sensitive layer (4) is used to change magnetic permeability based on the temperature of the susceptor.

2. 2. The susceptor according to claim 1, wherein the magnetic permeability of the temperature-sensitive layer (4) changes with temperature within a predetermined temperature range.

3. 3. The susceptor according to claim 2, wherein the predetermined temperature range is greater than or equal to a first temperature value and less than or equal to a second temperature value, the second temperature value being lower than the Curie point temperature of the material of the temperature-sensitive layer (4).

4. 4. A susceptor according to claim 3, characterized in that within the preset temperature range, the magnetic permeability of the temperature-sensitive layer (4) gradually increases with a gradually increasing temperature.

5. 4. A susceptor according to claim 3, characterized in that within the preset temperature range, the magnetic permeability of the temperature-sensitive layer (4) gradually decreases with a gradually increasing temperature.

6. 3. The susceptor according to claim 2, wherein the material of the temperature-sensitive layer (4) comprises a soft magnetic material.

7. The susceptor according to claim 6, characterized in that the material of the temperature sensitive layer (4) comprises 1j85 material.

8. 2. The susceptor according to claim 1, wherein the material of the temperature-sensitive layer (4) has a Curie point temperature of less than 800°C.

9. 2. The susceptor according to claim 1, wherein the material of the heat generating layer (2) includes a ferromagnetic material, and the Curie point temperature of the material of the heat generating layer (2) is higher than the Curie point temperature of the material of the temperature sensitive layer (4).

10. 2. The susceptor according to claim 1, wherein the material of the heat generating layer (2) includes a non-magnetic material.

11. 2. The susceptor according to claim 1, wherein the material of the thermally conductive layer (3) comprises a diamagnetic material.

12. The susceptor according to claim 11, characterized in that the material of the thermally conductive layer (3) comprises any one or more of gold, silver, copper, and graphene.

13. The susceptor (1) is sheet-shaped, and includes a sheet-shaped first main body portion (11) and a first tip portion (12) connected to the tip of the first main body portion (11).

14. 14. The susceptor according to claim 13, wherein the heat generating layer (2), the heat conducting layer (3), and the temperature sensitive layer (4) are parallel to each other and the three are stacked on top of each other.

15. 15. The susceptor according to claim 14, wherein the ratio of thicknesses of the heat generating layer (2), the heat conducting layer (3) and the temperature sensitive layer (4) is 5:1:

4.

16. 2. The susceptor of claim 1, wherein the shape of the susceptor (1) is tubular.

17. The susceptor (1) is cylindrical in shape and includes a cylindrical second body portion (13) and a second tip portion (14) connected to the tip of the second body portion (13).

18. 18. The susceptor according to claim 16 or 17, wherein the thermally conductive layer (3) and the temperature-sensitive layer (4) are at least partially embedded in the heat-generating layer (2), and the thermally conductive layer (3) separates the temperature-sensitive layer (4) from the heat-generating layer (2).

19. 19. The susceptor according to claim 18, wherein the ratio of thicknesses of the heat generating layer (2), the heat conducting layer (3) and the temperature sensitive layer (4) is 6:1:

3.

20. 19. The susceptor according to claim 18, wherein the heat conductive layer (3) is provided in two or more layers.

21. 19. The susceptor according to claim 18, wherein the temperature-sensitive layer (4) is provided in two or more layers.

22. 1. A heat generating assembly comprising: A heat generating assembly comprising a susceptor (1) according to any one of claims 1 to 21 and a coil surrounding the susceptor (1) for generating a magnetic field.

23. An aerosol-generating article, comprising:

22. An aerosol-generating article comprising an aerosol-generating matrix and a susceptor (1) according to any one of claims 1 to 21 for heating the aerosol-generating matrix.

24. An aerosol generating device, comprising: An aerosol generating device comprising a power supply assembly and a heat generating assembly as described in claim 22 or an aerosol generating article as described in claim 23, wherein the power supply assembly is used to drive the susceptor (1) to generate heat.

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