Induction heating element and heat-not-burn article

Abstract

The induction heating element comprises a base material layer, a first layer, a second layer, a third layer and a fourth layer, the first layer and the second layer are arranged on the two sides of the base material layer respectively and are tightly connected with the base material layer, the third layer is tightly connected to the side, opposite to the base material layer, of the first layer, and the fourth layer is tightly connected to the side, opposite to the base material layer, of the second layer. The fourth layer is tightly connected to one side, opposite to the base material layer, of the second layer; the substrate layer is used for inductively heating an aerosol forming substrate; the first layer and the second layer both have Curie temperature, and the first layer and the second layer are used as temperature feedback materials; the third layer and the fourth layer are made of anti-sticking materials with an anti-oxidation function; the induction heating element is of a stress symmetry structure. The induction heating element is of a stress symmetrical structure, so that the induction heating element can achieve dimensional stability without a stress compensation material.

Description

Technical Field

[0001] The utility model relates to the field of induction heating, in particular to an induction heating element and a heat-not-burn product. Background Art

[0002] In recent years, a new aerosol generation method of a heating-not-burning aerosol generating device based on induction heating has been developed. Its basic structure and principle are to place a solenoid outside the cavity of the aerosol generating device and embed a metal magnetic induction body in the aerosol generating matrix. During operation, an alternating current excites the solenoid, generating a high-speed alternating magnetic field in the solenoid, and the metal magnetic induction body embedded in the aerosol generating matrix generates a corresponding magnetic field in the magnetic field. The magnetic domains in the metal magnetic induction body rotate at a high speed, generating corresponding eddy current loss and hysteresis loss. The heat energy generated by the eddy current loss and hysteresis loss is used to heat the adjacent aerosol generating matrix to generate aerosol.

[0003] Embedding a metal magnetic induction body in the induction heating aerosol generating matrix is a heating method that heats the aerosol generating matrix from the inside. It heats from the center of the aerosol generating matrix without oxidative combustion, leaving no combustion residue, requiring no cleaning, and without problems such as heater damage.

[0004] To control the temperature of a substrate, existing patents propose a dual-layer induction heating material comprising a first layer and a second layer made of two materials, respectively. The first layer of induction heating material is optimized for heating efficiency and typically has a higher Curie temperature. In contrast, the second layer of induction heating material is used as a temperature feedback element. To this end, the second layer of induction heating material has a Curie temperature lower than that of the first layer of induction heating material. At its Curie temperature, the magnetic permeability of the second layer of induction heating material drops by an order of magnitude, causing its magnetism to change from ferromagnetism or ferrimagnetism to paramagnetism, accompanied by a sudden change in its resistance. Therefore, by monitoring the corresponding change in the current output by the induction power supply, it is possible to detect whether the second layer of induction heating material has reached its Curie temperature, and feedback control can be used to ensure that the second layer of induction heating material operates at the predefined heating temperature of the second layer of induction heating material.

[0005] Although this double-layer induction heating material provides good controllability of the heating temperature, during or after use, due to the different linear expansion coefficients of the two layers of material, one layer exerts internal stress on the other layer, and the double-layer induction heating material will be deformed due to this unbalanced internal stress. Utility Model Content

[0006] In response to the above problems, the present utility model proposes an induction heating element for heating an aerosol-forming matrix and a moxibustion product.

[0007] The technical solutions adopted by this utility model are as follows:

[0008] An induction heating element for heating an aerosol-forming substrate, comprising a substrate layer, a first layer, and a second layer, wherein the first layer and the second layer are respectively disposed on both sides of the substrate layer and are tightly connected to the substrate layer;

[0009] The substrate layer is used for inductively heating the aerosol-forming matrix; the first layer and the second layer both have Curie temperatures, and the first layer and the second layer are used as temperature feedback materials;

[0010] The induction heating element has a stress-symmetrical structure.

[0011] "Intense bonding" refers to a mechanical connection or, more specifically, a metallurgical bond between two layers within a multilayer assembly, enabling reliable stress transfer between the two layers, particularly in a direction parallel to the layer structure. The connection can be two-dimensional or three-dimensional; specifically, the two layers intimately bonded together can be in direct contact with each other. Alternatively, the connection can be indirect via another medium; specifically, the two layers can be indirectly connected via at least one intermediate layer. Preferably, both the first and second layers are directly bonded to the substrate layer.

[0012] The "stress-symmetrical structure" of the present application means that with the substrate layer as the center of symmetry, the first and second layers generate internal stresses of the same direction and magnitude during temperature changes. The induction heating element is a stress-symmetrical structure, which compensates for the thermal expansion differences between different materials in the induction heating element, so that at least within the operating temperature range, the induction heating element only generates symmetrical internal stress changes and the overall thermal deformation is almost zero. In the induction heating element of the present application, the substrate layer is used to induction heat the aerosol to form a matrix, and the first and second layers are used as temperature feedback materials. Therefore, the Curie temperatures of the first and second layers correspond to the predefined heating temperature of the induction heating element. In actual use, the operating temperature range can be set as needed, for example, it can be set to at least 50K lower than the Curie temperature of the first layer and extend to the Curie temperature of the first layer. Although the Curie temperature and temperature feedback function are the main properties of the materials of the first and second layers, the conductivity of the first and second layers can also contribute to heating.

[0013] In actual use, the specific applications of induction heating elements include but are not limited to products such as heat-not-burn wormwood, heat-not-burn aromatherapy, heat-not-burn electric mosquito coils and heat-not-burn tobacco products.

[0014] In one embodiment of the present invention, the substrate layer includes at least one of a ferromagnetic metal, a paramagnetic metal, and a ferrimagnetic metal, and the substrate layer has a first Curie temperature;

[0015] The first layer has a second Curie temperature, and the second layer has a third Curie temperature;

[0016] The first Curie temperature is greater than the second Curie temperature and greater than the third Curie temperature.

[0017] When the temperature exceeds the Curie temperature of the corresponding layer, the magnetic permeability of the corresponding layer drops by an order of magnitude, causing its magnetism to change from ferromagnetism or ferrimagnetism to paramagnetism, accompanied by a sudden change in its resistance. This can be monitored by monitoring the corresponding change in the current output by the induction power supply, thereby detecting whether the induction heating element has reached the corresponding Curie temperature. Through feedback control, the induction heating element can be operated at any preset operating temperature. The induction heating element has multiple Curie temperatures, so it can provide at least two preset operating temperatures during operation.

[0018] The substrate layer comprises at least one of a ferromagnetic metal, a paramagnetic metal, and a ferrimagnetic metal, so that heat can be generated not only through eddy currents but also through hysteresis losses. In practical applications, the substrate layer can comprise iron or an iron alloy, such as steel or an iron-nickel alloy. Specifically, the substrate layer can comprise stainless steel, such as ferritic stainless steel or martensitic stainless steel. In particular, the substrate layer can comprise 400 series stainless steel, such as 410 stainless steel, 420 stainless steel, or 430 stainless steel.

[0019] In one embodiment of the present invention, the first layer and the second layer are made of the same material and have the same thickness, and the second Curie temperature is equal to the third Curie temperature.

[0020] At this time, the induction heating element can provide two preset operating temperatures through two different Curie temperatures (a first Curie temperature and a second Curie temperature).

[0021] In one embodiment of the present invention, the first layer and the second layer are made of different materials and have different thicknesses, and the second Curie temperature is different from the third Curie temperature;

[0022] The ratio of the first layer to the substrate layer is a constant K1, the thickness of the first layer is δ1, the ratio of the second layer to the substrate layer is a constant K2, the thickness of the first layer is δ2, δ1 / δ2=K1 / K2.

[0023] When the material of the second layer is different from that of the first layer, the thickness of the first layer and the second layer should be adjusted to a thickness ratio that produces the same stress within the working temperature range through the actual linear expansion coefficient. Specifically, the bending ratio of the second layer material to the substrate layer is a constant K2. The deformation of the first layer material with a thickness of δ1 and the substrate layer under a temperature difference ΔT is L1 = (K1·L^2 / δ1)·ΔT. The deformation of the second layer material with a thickness of δ2 and the substrate layer under a temperature difference ΔT is L2 = (K2·L^2 / δ2)·ΔT. The deformation ΔL = L1-L2. When L1 = L2, ΔL is always 0. That is, the "stress symmetrical structure" can be achieved by adjusting the thickness ratio of the second layer material to the first layer material (so that it satisfies δ1 / δ2 = K1 / K2).

[0024] At this time, the induction heating element can provide three preset operating temperatures through three different Curie temperatures (first Curie temperature, second Curie temperature and third Curie temperature), and more heating gear options are available.

[0025] In one embodiment of the present invention, the substrate layer does not have a Curie temperature;

[0026] The first layer has a second Curie temperature, the second layer has a third Curie temperature, the first layer and the second layer are made of different materials and have different thicknesses, and the second Curie temperature is different from the third Curie temperature;

[0027] The ratio of the first layer to the substrate layer is a constant K1, the thickness of the first layer is δ1, the ratio of the second layer to the substrate layer is a constant K2, the thickness of the first layer is δ2, δ1 / δ2=K1 / K2.

[0028] At this time, the induction heating element can provide two preset operating temperatures through two different Curie temperatures (the second Curie temperature and the third Curie temperature).

[0029] In one embodiment of the present invention, the substrate layer comprises stainless steel, the first Curie temperature exceeds 600°C; the second Curie temperature is between 150°C and 550°C; and the third Curie temperature is between 150°C and 550°C.

[0030] The substrate layer is primarily used to heat the aerosol-forming substrate. To this end, the substrate layer is enhanced with respect to eddy current and / or hysteresis losses and is thus optimized with respect to heating efficiency.

[0031] In one embodiment of the present invention, the first layer includes ferromagnetic metal, and the second Curie temperature is between 260°C and 450°C; the second layer includes ferromagnetic metal, and the third Curie temperature is between 260°C and 450°C.

[0032] The first and second layers comprise ferromagnetic metals, such as nickel and its alloys. Depending on the properties of the alloying elements, the Curie temperatures of nickel alloys range from approximately 260°C to 450°C, respectively. Curie temperatures within this range are ideal because they are approximately the same temperature to which the aerosol-forming substrate should be heated to generate aerosols, yet still sufficiently low to avoid local overheating or burning of the aerosol-forming substrate. During heating, when the substrate layer reaches the Curie temperature of the nickel alloy, the magnetic properties of the materials of the first and second layers change from ferromagnetic to paramagnetic, accompanied by a sudden change in their electrical resistance. Therefore, by monitoring the corresponding change in the current output by the induction power supply, it is possible to detect whether the first and second layers have reached their Curie temperatures, and feedback control can be used to operate the induction heating element at operating temperatures corresponding to different Curie temperatures.

[0033] In one embodiment of the present invention, a third layer and a fourth layer are further included, wherein the third layer is tightly connected to the side of the first layer facing away from the substrate layer, and the fourth layer is tightly connected to the side of the second layer facing away from the substrate layer. The third layer and the fourth layer are anti-sticking materials with anti-oxidation function.

[0034] The induction heating element of the present application having the third layer and the fourth layer is also a "stress symmetrical structure", that is, the substrate layer is the center of symmetry, and the first layer and the second layer, including the third layer and the fourth layer located above the first layer and the second layer, generate internal stresses of the same direction and magnitude during temperature changes.

[0035] The purpose of providing the third and fourth layers is to improve the anti-sticking and anti-oxidation properties of the induction heating element, and to prevent the composite material from adhering to the aerosol-forming matrix during use. In actual use, the materials of the third and fourth layers are the same and the thickness is the same, and the materials of the third and fourth layers can be metal or non-metal. When it is a non-metal, it can be: silicon dioxide, silicate, borosilicate, polysiloxane, polysilazane, polyborosilazane, polysilicon carbide, boron nitride, silicon nitride, silicon carbide magnesium oxide and aluminum oxide. When it is a metal, it can be: ferromagnetic metal (preferably iron or iron alloy, such as steel or iron-nickel alloy), titanium, etc. The thickness of the third and fourth layers may not be 5μm.

[0036] In one embodiment of the present invention, the substrate layer is a 410 stainless steel strip with a thickness of 45 μm, the first layer is a 1J50 nickel-iron alloy strip with a thickness of 10 μm, the second layer is a 1J77 nickel-iron alloy strip with a thickness of 12 μm, and the third and fourth layers are thermal decomposition products of polysilazane at 800°C. The thickness of the third and fourth layers is 5 μm, and the total thickness of the induction heating element is 77 μm.

[0037] The third and fourth layers are thermal decomposition products of polysilazane at 800°C, which are a mixture of amorphous silicon nitride and silicon carbide. This material is resistant to high temperatures and has anti-stick and antioxidant properties.

[0038] In actual use, each layer of the induction heating element is in the shape of a long strip, and each layer of the induction heating element has a length L of 11 mm and a width W of 4 mm.

[0039] The present application also discloses a heat-not-burn product comprising the above-mentioned induction heating element.

[0040] In one embodiment of the present invention, the device further comprises a substrate container, an aerosol cooling element, and an aerosol gathering element arranged in sequence;

[0041] An aerosol generating substrate is installed in the substrate container, and the induction heating element is located in the substrate container and in contact with the aerosol generating substrate;

[0042] The heat-not-burn product is used to cooperate with an induction heating device, which includes an induction coil or an inductor for generating an alternating electromagnetic field. The induction heating device is used to heat the induction heating element of the heat-not-burn product, so that the induction heating element heats the aerosol-generating matrix to produce an aerosol, and the aerosol is cooled by the aerosol cooling element and then flows into the aerosol gathering element.

[0043] In one embodiment of the present invention, the aerosol generating substrate is heat-not-burn wormwood, heat-not-burn aromatherapy, heat-not-burn electric mosquito coil or heat-not-burn tobacco.

[0044] The beneficial effect of the present invention is that the induction heating element has a stress-symmetrical structure. During temperature changes, the first and second layers generate internal stresses of the same direction and magnitude. As a result, at least within the operating temperature range, the induction heating element only experiences symmetrical internal stress changes, while overall thermal deformation is virtually zero. This stress-symmetrical structure allows the induction heating element to achieve dimensional stability without the need for stress-compensating materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic diagram of an induction heating element;

[0046] Figure 2 It is a schematic diagram of a heat-not-burn product.

[0047] The reference numerals in the figures are:

[0048] 1. Induction heating element; 11. Substrate layer; 12. First layer; 13. Second layer; 14. Third layer; 15. Fourth layer; 2. Matrix container; 21. Aerosol generating matrix; 3. Aerosol cooling element; 4. Aerosol gathering element. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0050] In the description of this application, it should be noted that the terms "inner" and "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended solely to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" and the like are used solely for distinction and should not be construed as indicating or implying relative importance.

[0051] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0052] The present invention will be described in detail below with reference to the accompanying drawings.

[0053] like Figure 1 As shown, an induction heating element 1 for heating an aerosol-forming substrate comprises a substrate layer 11, a first layer 12, and a second layer 13, wherein the first layer 12 and the second layer 13 are respectively arranged on both sides of the substrate layer 11 and are tightly connected to the substrate layer 11;

[0054] The substrate layer 11 is used for induction heating of the aerosol-forming matrix; the first layer 12 and the second layer 13 both have Curie temperatures, and the first layer 12 and the second layer 13 are used as temperature feedback materials;

[0055] The induction heating element 1 has a stress-symmetrical structure.

[0056] "Intense bonding" refers to a mechanical connection or, more specifically, a metallurgical bond between two layers within a multilayer assembly, enabling reliable stress transfer between the two layers, particularly in a direction parallel to the layer structure. This bonding can be two-dimensional or three-dimensional; specifically, the two layers in intimate bonding can be in direct contact with each other. Alternatively, the bonding can be indirect via another medium; specifically, the two layers can be indirectly connected via at least one intermediate layer. Preferably, both the first layer 12 and the second layer 13 are directly bonded to the substrate layer 11.

[0057] The term "stress-symmetric structure" used in this application means that, with the substrate layer 11 as the center of symmetry, the first and second layers 12, 13 generate internal stresses of the same direction and magnitude during temperature changes. The induction heating element 1 has a stress-symmetric structure, compensating for differences in thermal expansion among the different materials within the induction heating element 1. This ensures that, at least within the operating temperature range, the induction heating element 1 generates only symmetrical internal stress changes, while overall thermal deformation is virtually zero. In the induction heating element 1 of this application, the substrate layer 11 serves as the inductively heated aerosol-forming matrix, while the first and second layers 12, 13 serve as temperature feedback materials. Therefore, the Curie temperatures of the first and second layers 12, 13 correspond to the predefined heating temperature of the induction heating element 1. In practical applications, the operating temperature range can be customized, for example, extending from at least 50K below the Curie temperature of the first layer 12 to the Curie temperature of the first layer 12. While the Curie temperature and temperature feedback function are primary properties of the materials of the first and second layers 12, 13, their electrical conductivity can also contribute to heating.

[0058] In actual use, the specific applications of the induction heating element 1 include but are not limited to products such as heat-not-burn wormwood, heat-not-burn aromatherapy, heat-not-burn electric mosquito coils and heat-not-burn tobacco products.

[0059] In this embodiment, the substrate layer 11 includes at least one of ferromagnetic metal, paramagnetic metal, and ferrimagnetic metal, and the substrate layer 11 has a first Curie temperature;

[0060] The first layer 12 has a second Curie temperature, and the second layer 13 has a third Curie temperature;

[0061] The first Curie temperature is greater than the second Curie temperature and greater than the third Curie temperature.

[0062] When the temperature exceeds the Curie temperature of the corresponding layer, the magnetic permeability of the corresponding layer drops by an order of magnitude, causing its magnetism to change from ferromagnetism or ferrimagnetism to paramagnetism, accompanied by a sudden change in its resistance. This can be monitored by monitoring the corresponding change in the current output by the induction power supply, thereby detecting whether the induction heating element 1 has reached the corresponding Curie temperature. Through feedback control, the induction heating element 1 can be operated at any preset operating temperature. The induction heating element 1 has multiple Curie temperatures, so it can provide at least two preset operating temperatures during operation.

[0063] The substrate layer 11 comprises at least one of a ferromagnetic metal, a paramagnetic metal, and a ferrimagnetic metal. This allows heat to be generated not only through eddy currents but also through hysteresis losses. In practical applications, the substrate layer 11 can comprise iron or an iron alloy, such as steel or an iron-nickel alloy. Specifically, the substrate layer 11 can comprise stainless steel, such as ferritic stainless steel or martensitic stainless steel. In particular, the substrate layer 11 can comprise 400 series stainless steel, such as 410 stainless steel, 420 stainless steel, or 430 stainless steel.

[0064] In this embodiment, the first layer 12 and the second layer 13 are made of different materials and have different thicknesses, and the second Curie temperature is different from the third Curie temperature;

[0065] The ratio of the first layer 12 to the base layer 11 is a constant K1, and the thickness of the first layer 12 is δ1. The ratio of the second layer 13 to the base layer 11 is a constant K2, and the thickness of the first layer 12 is δ2. δ1 / δ2=K1 / K2.

[0066] When the material of the second layer 13 is different from that of the first layer 12, the thickness of the first layer 12 and the second layer 13 should be adjusted to a thickness ratio that produces the same stress within the working temperature range through the actual linear expansion coefficient. Specifically, the bending ratio of the second layer 13 material to the substrate layer 11 is a constant K2. The deformation of the first layer 12 material with a thickness of δ1 and the substrate layer 11 under the temperature difference ΔT is L1 = (K1·L^2 / δ1)·ΔT, and the deformation of the second layer 13 material with a thickness of δ2 and the substrate layer 11 under the temperature difference ΔT is L2 = (K2·L^2 / δ2)·ΔT. The deformation ΔL = L1-L2. When L1 = L2, ΔL is always 0, that is, the "stress symmetrical structure" can be achieved by adjusting the thickness ratio of the second layer 13 material to the first layer 12 material (so that it satisfies δ1 / δ2 = K1 / K2).

[0067] At this time, the induction heating element 1 can provide three preset operating temperatures through three different Curie temperatures (the first Curie temperature, the second Curie temperature and the third Curie temperature), and more heating gear options are available.

[0068] In other embodiments, the first layer 12 and the second layer 13 may be made of the same material and have the same thickness, and the second Curie temperature is equal to the third Curie temperature. In this case, the induction heating element 1 can provide two preset operating temperatures by using two different Curie temperatures (the first Curie temperature and the second Curie temperature).

[0069] In other embodiments, the substrate layer 11 does not have a Curie temperature, and the first layer 12 and the second layer 13 are the same as in this embodiment. In this case, the induction heating element 1 can provide two preset operating temperatures through two different Curie temperatures (the second Curie temperature and the third Curie temperature).

[0070] In this embodiment, substrate layer 11 comprises stainless steel having a first Curie temperature exceeding 600°C, a second Curie temperature between 150°C and 550°C, and a third Curie temperature between 150°C and 550°C. Substrate layer 11 is primarily used to heat the aerosol-forming substrate. To this end, substrate layer 11 is enhanced with respect to eddy current and / or hysteresis losses, thereby optimizing heating efficiency.

[0071] In this embodiment, preferably, the first layer 12 includes a ferromagnetic metal, and the second Curie temperature is between 260°C and 450°C; the second layer 13 includes a ferromagnetic metal, and the third Curie temperature is between 260°C and 450°C.

[0072] The material of the first layer 12 and the second layer 13 comprises a ferromagnetic metal, such as nickel and its alloys. Depending on the properties of the alloying elements, the Curie temperatures of nickel alloys range from approximately 260°C to 450°C, respectively. Curie temperatures within this range are ideal because they are approximately the same temperature to which aerosols should be generated from the aerosol-forming substrate, yet still sufficiently low to avoid local overheating or combustion of the aerosol-forming substrate. During heating, when the substrate layer 11 reaches the Curie temperature of the nickel alloy, the magnetic properties of the material of the first layer 12 and the second layer 13 change from ferromagnetic to paramagnetic, accompanied by a sudden change in their electrical resistance. Therefore, by monitoring the corresponding change in the current output by the inductive power supply, it is possible to detect whether the first layer 12 and the second layer 13 have reached their Curie temperatures, and feedback control can be used to operate the induction heating element 1 at operating temperatures corresponding to different Curie temperatures.

[0073] like Figure 1 As shown, in this embodiment, a third layer 14 and a fourth layer 15 are further included. The third layer 14 is tightly connected to the side of the first layer 12 facing away from the substrate layer 11, and the fourth layer 15 is tightly connected to the side of the second layer 13 facing away from the substrate layer 11. The third layer 14 and the fourth layer 15 are anti-sticking materials with anti-oxidation function.

[0074] The induction heating element 1 of the present application having the third layer 14 and the fourth layer 15 is also a "stress-symmetrical structure", that is, the substrate layer 11 is the center of symmetry, and the first layer 12 and the second layer 13, including the third layer 14 and the fourth layer 15 located above the first layer 12 and the second layer 13, generate internal stresses of the same direction and magnitude during temperature changes.

[0075] The purpose of providing the third layer 14 and the fourth layer 15 is to improve the anti-sticking property and the anti-oxidation property of the induction heating element 1, and to prevent the composite material from adhering to the aerosol-forming matrix during use. In actual use, the material of the third layer 14 and the fourth layer 15 is the same and the thickness is the same. The material of the third layer 14 and the fourth layer 15 can be metal or non-metal. When it is non-metal, it can be: silicon dioxide, silicate, borosilicate, polysiloxane, polysilazane, polyborosilazane, polysilicon carbide, boron nitride, silicon nitride, silicon carbide magnesium oxide and aluminum oxide. When it is metal, it can be: ferromagnetic metal (preferably iron or iron alloy, such as steel or iron-nickel alloy), titanium, etc.

[0076] In other embodiments, the first layer 12 and the second layer 13 are made of the same material and have the same thickness. In this case, a third layer 14 and a fourth layer 15 are respectively disposed on the outer sides of the first layer 12 and the second layer 13 .

[0077] like Figure 1 As shown, in this embodiment, the substrate layer 11 is a 410 stainless steel strip with a thickness of 45 μm, the first layer 12 is a 1J50 nickel-iron alloy strip with a thickness of 10 μm, the second layer 13 is a 1J77 nickel-iron alloy strip with a thickness of 12 μm, the third layer 14 and the fourth layer 15 are thermal decomposition products of polysilazane at 800°C, the thickness of the third layer 14 and the fourth layer 15 are both 5 μm, and the total thickness of the induction heating element 1 is 77 μm.

[0078] The third layer 14 and the fourth layer 15 are thermal decomposition products of polysilazane at 800° C., and are a mixture of amorphous silicon nitride and silicon carbide. This material is resistant to high temperatures and has anti-sticking and anti-oxidation properties.

[0079] like Figure 1 As shown, in this embodiment, each layer of the induction heating element 1 is in the shape of a long strip, and each layer of the induction heating element 1 has a length L of 11 mm and a width W of 4 mm.

[0080] like Figure 2 As shown, this embodiment also discloses a heat-not-burn product, comprising a substrate container 2, an aerosol cooling element 3 and an aerosol gathering element 4 arranged in sequence, and also comprising the induction heating element 1 of this embodiment for heating the aerosol-forming substrate;

[0081] An aerosol-generating substrate 21 is installed in the substrate container 2, and the induction heating element 1 is located in the substrate container 2 and in contact with the aerosol-generating substrate;

[0082] The heated non-combustible product is used in conjunction with an induction heating device, which includes an induction coil or an inductor for generating an alternating electromagnetic field. The induction heating device is used to heat the induction heating element 1 of the heated non-combustible product, so that the induction heating element 1 heats the aerosol generating matrix 21 to generate aerosol, and the aerosol is cooled by the aerosol cooling element 3 and then flows into the aerosol gathering element 4.

[0083] like Figure 2 As shown, in actual use, the substrate container 2 and the aerosol-cooling element 3 are roughly cylindrical, each having substantially the same diameter, the induction heating element 1 and the aerosol-generating substrate have substantially the same length, and the centerline of the induction heating element 1 substantially coincides with the centerline of the aerosol-generating substrate.

[0084] In actual use, different products can be formed according to the different aerosol generating matrices. The aerosol generating matrices can be heat-not-burn wormwood, heat-not-burn aromatherapy, heat-not-burn electric mosquito coils or heat-not-burn tobacco.

[0085] When the aerosol generating matrix is heated but not burned mugwort, the aerosol generating matrix is a homogenized moxa material surrounded by packaging material. The homogenized moxa material is in a clustered flocculent state, and the aerosol gathering element 4 is an umbrella-shaped structure, which facilitates the aerosol to flow into the aerosol gathering element 4 after being cooled by the aerosol cooling element 3 and finally act on human skin.

[0086] The above description is only a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structural transformation made by using the contents of the description and drawings of the present invention, directly or indirectly applied in other related technical fields, is also included in the scope of protection of the present invention.

Claims

1. An induction heating element for heating an aerosol-forming substrate, characterized in that The invention comprises a substrate layer, a first layer, a second layer, a third layer and a fourth layer, wherein the first layer and the second layer are respectively arranged on both sides of the substrate layer and are tightly connected to the substrate layer, the third layer is tightly connected to the side of the first layer facing away from the substrate layer, and the fourth layer is tightly connected to the side of the second layer facing away from the substrate layer; The substrate layer is used for induction heating of the aerosol-forming matrix; the first layer and the second layer both have Curie temperatures, and the first layer and the second layer are used as temperature feedback materials; the third layer and the fourth layer are anti-sticking materials with anti-oxidation function; The induction heating element has a stress-symmetrical structure.

2. The induction heating element according to claim 1, wherein The first layer and the second layer are made of the same material and have the same thickness, and the Curie temperature of the first layer is equal to the second Curie temperature.

3. The induction heating element according to claim 1, wherein The materials of the first layer and the second layer are different and the thicknesses are also different. The Curie temperature of the first layer is different from the Curie temperature of the second layer. The ratio of the first layer to the substrate layer is a constant K1, and the thickness of the first layer is δ1. The ratio of the second layer to the substrate layer is a constant K2, and the thickness of the first layer is δ2. δ1 / δ2=K1 / K2.

4. The induction heating element according to claim 3, wherein The substrate layer is a 410 stainless steel strip with a thickness of 45 μm, the first layer is a 1J50 nickel-iron alloy strip with a thickness of 10 μm, and the second layer is a 1J77 nickel-iron alloy strip with a thickness of 12 μm.

5. The induction heating element according to claim 3, wherein The substrate layer is made of stainless steel and has a Curie temperature of 600°C. The Curie temperature of the first layer is between 150°C and 550°C. The Curie temperature of the second layer is between 150°C and 550°C.

6. The induction heating element according to claim 2 or 3, characterized in that The materials of the third layer and the fourth layer are silicon dioxide, silicate, borosilicate, polysiloxane, polysilazane, polyborosilazane, polysilicon carbane, boron nitride, silicon nitride, silicon carbide, magnesium oxide or aluminum oxide.

7. The induction heating element according to claim 2 or 3, characterized in that The third layer and the fourth layer are made of iron, iron alloy or titanium.

8. A heat-not-burn product, characterized in that: The induction heating element comprises the induction heating element according to any one of claims 1 to 7.

9. The heat-not-burn product according to claim 8, wherein: It also includes a substrate container, an aerosol cooling element and an aerosol gathering element which are arranged in sequence; An aerosol generating substrate is installed in the substrate container, and the induction heating element is located in the substrate container and in contact with the aerosol generating substrate; The heat-not-burn product is used to cooperate with an induction heating device, which includes an induction coil or an inductor for generating an alternating electromagnetic field. The induction heating device is used to heat the induction heating element of the heat-not-burn product, so that the induction heating element heats the aerosol-generating matrix to produce an aerosol, and the aerosol is cooled by the aerosol cooling element and then flows into the aerosol gathering element.

10. The heat-not-burn product according to claim 9, wherein: The aerosol generating substrate is heat-not-burn wormwood, heat-not-burn aromatherapy, heat-not-burn electric mosquito coil or heat-not-burn tobacco product.

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