Induction heating element for heating aerosol-forming substrate and moxibustion article

Abstract

The invention discloses an induction heating element for heating an aerosol forming substrate and a moxibustion product, the induction heating element comprises a substrate layer, a first layer and a second layer, the first layer and the second layer are respectively arranged on two sides of the substrate layer and are tightly connected with the substrate 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 induction heating element is of a stress symmetry structure. The induction heating element is of a stress symmetric structure, and the first layer and the second layer generate internal stress with the same direction and size during temperature change, so that the induction heating element only generates symmetric internal stress change and the overall thermal deformation is almost zero at least in a working temperature range. The stress symmetric structure enables the induction heating element to achieve dimensional stability without a stress compensation material.

Description

Technical Field

[0001] The invention relates to the field of induction heating, and in particular to an induction heating element for heating an aerosol-forming matrix and a moxibustion product. Background Art

[0002] In recent years, a new type of aerosol generation method of a heat-not-burn 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 changing 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] In order to control the temperature of the substrate, the existing patent literature proposes a double-layer induction heating material including a first layer and a second layer made of two materials respectively. The first layer of induction heating material is optimized in terms of heating efficiency and usually 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 can be detected whether the second layer of induction heating material has reached its Curie temperature, and feedback control is used to make it operate 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. Summary of the invention

[0006] In view of the above problems, the present invention proposes an induction heating element for heating an aerosol-forming matrix and a moxibustion product.

[0007] The technical solution adopted by the present invention is 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 arranged on both sides of the substrate layer and are closely connected to the substrate layer;

[0009] The substrate layer is used for inductively heating the aerosol-forming substrate; 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] "Close connection" refers to a mechanical connection or further metallurgical connection between two layers in a multilayer component, so that stress can be reliably transferred between the two layers, especially in a direction parallel to the layer structure. The connection can be a two-dimensional or three-dimensional connection, in particular, the two layers that are tightly connected to each other can be in direct contact with each other. Alternatively, the connection can be an indirect connection through other media, in particular, the two layers can be indirectly connected through at least one intermediate layer. Preferably, both the first layer and the second layer are directly connected to the substrate layer.

[0012] The "stress symmetric structure" of the present application means that with the substrate layer as the symmetry center, the first layer and the second layer generate internal stresses of the same direction and magnitude during temperature changes. The induction heating element is a stress symmetric structure, which compensates for the thermal expansion differences of 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 for induction heating aerosol formation matrix, and the first layer and the second layer are used as temperature feedback materials, so the Curie temperatures of the first layer and the second layer 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 first layer and the second layer materials, the conductivity of the first layer and the second layer 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 is higher than 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, which can be monitored by monitoring the corresponding change in the current output by the induction power supply, so that it can be detected whether the induction heating element has reached the corresponding Curie temperature, and the induction heating element can be operated at any preset working temperature through feedback control. The induction heating element has multiple Curie temperatures, so that at least two preset working temperatures can be provided during operation.

[0018] The substrate layer includes at least one of a ferromagnetic metal, a paramagnetic metal, and a ferrimagnetic metal, so that heat can be generated not only by eddy currents but also by hysteresis losses. In practical applications, the substrate layer may include iron or an iron alloy, such as steel or an iron-nickel alloy. Specifically, the substrate layer may include stainless steel, such as ferritic stainless steel or martensitic stainless steel. In particular, the substrate layer includes 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 working temperatures through two different Curie temperatures (the first Curie temperature and the 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, 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.

[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 the 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, and 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 working 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, 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.

[0028] At this time, the induction heating element can provide two preset working 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 mainly used to heat the aerosol-forming substrate. For this purpose, the substrate layer is enhanced in terms of eddy current and / or hysteresis losses and is thus optimized in terms of heating efficiency.

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

[0032] The first layer and the second layer of material include ferromagnetic metals, such as nickel and its alloys. Depending on the properties of the alloying elements, the Curie temperatures of nickel alloys are in the range of about 260°C to 450°C, respectively. The Curie temperature in this range is ideal because it is approximately the same as the temperature to which the aerosol should be heated in order to generate an aerosol from the aerosol-forming substrate, but is still low enough to avoid local overheating or burning of the aerosol-forming substrate. During heating, the substrate layer reaches the Curie temperature of the nickel alloy, and the magnetic properties of the materials of the first layer and the second layer change from ferromagnetism to paramagnetism, accompanied by a sudden change in their resistance. Therefore, by monitoring the corresponding change in the current output by the induction power supply, it can be detected whether the first layer and the second layer have reached their Curie temperatures, and the induction heating element is operated at the operating temperature corresponding to different Curie temperatures through feedback control.

[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, and 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 third and fourth layers are provided for the purpose of improving the anti-sticking and anti-oxidation properties of the induction heating element, and preventing the composite material from adhering to the aerosol-forming matrix during use. In actual use, the third and fourth layers have the same material and thickness, and the third and fourth layers 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.

[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, the third layer and the fourth layer are thermal decomposition products of polysilazane at 800°C, the thickness of the third layer and the fourth layer are both 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-sticking 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 moxibustion product, comprising a substrate container, an aerosol cooling element and an aerosol gathering element arranged in sequence, and also comprising the above-mentioned induction heating element for heating the aerosol-forming substrate;

[0040] An aerosol generating substrate is installed in the substrate container, the aerosol generating substrate comprises a homogenized moxa material surrounded by a packaging material, and the homogenized moxa material is in an aggregated flocculent state; the induction heating element is located in the substrate container and in contact with the aerosol generating substrate, and the aerosol aggregating element is an umbrella-shaped structure;

[0041] The moxibustion 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 moxibustion product, so that the induction heating element heats the aerosol generating matrix to produce an aerosol. The aerosol is cooled by an aerosol cooling element and then flows into an aerosol gathering element, and finally acts on human skin.

[0042] In actual use, the substrate container and the aerosol cooling element are roughly cylindrical, each having substantially the same diameter, the induction heating element and the aerosol generating substrate have substantially the same length, and the centerline of the induction heating element substantially coincides with the centerline of the aerosol generating substrate.

[0043] The beneficial effect of the present invention is that the induction heating element has a stress-symmetrical structure, and the first layer and the second layer generate internal stresses of the same direction and magnitude during temperature changes, 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. That is, the stress-symmetrical structure enables the induction heating element to achieve dimensional stability without the need for stress compensation materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic diagram of an induction heating element for heating an aerosol-forming substrate;

[0045] Figure 2 It is a schematic diagram of moxibustion products.

[0046] The reference numerals in the figures are:

[0047] 1. Induction heating element; 11. Base material 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

[0048] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0050] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] The present invention is described in detail below in conjunction with the accompanying drawings.

[0052] 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 closely connected to the substrate layer 11;

[0053] The substrate layer 11 is used for induction heating of the aerosol-forming substrate; 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;

[0054] The induction heating element 1 is a stress-symmetrical structure.

[0055] "Close connection" refers to a mechanical connection or further metallurgical connection between two layers in a multilayer assembly, so that stress can be reliably transferred between the two layers, especially in a direction parallel to the layer structure. The connection can be a two-dimensional or three-dimensional connection. Specifically, the two layers that are closely connected to each other can be in direct contact with each other. Alternatively, the connection can be an indirect connection through other media. Specifically, the two layers can be indirectly connected through at least one intermediate layer. Preferably, the first layer 12 and the second layer 13 are both directly connected to the substrate layer 11.

[0056] The "stress symmetric structure" of the present application means that with the substrate layer 11 as the symmetry center, the first layer 12 and the second layer 13 generate internal stresses of the same direction and magnitude during temperature changes. The induction heating element 1 is a stress symmetric structure, which compensates for the thermal expansion differences of different materials in the induction heating element 1, so that at least within the operating temperature range, the induction heating element 1 only generates symmetrical internal stress changes and the overall thermal deformation is almost zero. In the induction heating element 1 of the present application, the substrate layer 11 is used for induction heating aerosol formation matrix, and the first layer 12 and the second layer 13 are used as temperature feedback materials, so the Curie temperature of the first layer 12 and the second layer 13 corresponds to the predefined heating temperature of the induction heating element 1. 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 12 and extend to the Curie temperature of the first layer 12. Although the Curie temperature and temperature feedback function are the main properties of the materials of the first layer 12 and the second layer 13, the conductivity of the first layer 12 and the second layer 13 can also contribute to heating.

[0057] 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.

[0058] In this embodiment, the substrate layer 11 includes at least one of a ferromagnetic metal, a paramagnetic metal, and a ferrimagnetic metal, and the substrate layer 11 has a first Curie temperature;

[0059] The first layer 12 has a second Curie temperature, and the second layer 13 has a third Curie temperature;

[0060] The first Curie temperature is greater than the second Curie temperature and greater than the third Curie temperature.

[0061] When the temperature is higher than 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, which can be monitored by monitoring the corresponding change in the current output by the induction power supply, so that it can be detected whether the induction heating element 1 has reached the corresponding Curie temperature, and the induction heating element 1 can be operated at any preset working temperature through feedback control. The induction heating element 1 has multiple Curie temperatures, so that at least two preset working temperatures can be provided during operation.

[0062] The substrate layer 11 includes at least one of a ferromagnetic metal, a paramagnetic metal, and a ferrimagnetic metal, so that heat can be generated not only by eddy currents but also by hysteresis losses. In actual use, the substrate layer 11 may include iron or an iron alloy, such as steel or an iron-nickel alloy. Specifically, the substrate layer 11 may include stainless steel, such as ferritic stainless steel or martensitic stainless steel. In particular, the substrate layer 11 includes 400 series stainless steel, such as 410 stainless steel, 420 stainless steel, or 430 stainless steel.

[0063] 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;

[0064] The ratio of the first layer 12 to the substrate 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 substrate layer 11 is a constant K2, and the thickness of the first layer 12 is δ2. δ1 / δ2=K1 / K2.

[0065] 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, and the deformation of the first layer 12 material with a thickness of δ1 and the substrate layer 11 under a temperature difference ΔT is L1 = (K1·L^2 / δ1)·ΔT. The deformation of the second layer 13 material with a thickness of δ2 and the substrate layer 11 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 13 material to the first layer 12 material (so that it satisfies δ1 / δ2 = K1 / K2).

[0066] At this time, the induction heating element 1 can provide three preset working temperatures through three different Curie temperatures (the first Curie temperature, the second Curie temperature and the third Curie temperature), and more heating gears can be selected.

[0067] In other embodiments, it can also be configured as follows: the first layer 12 and the second layer 13 are 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 working temperatures through two different Curie temperatures (the first Curie temperature and the second Curie temperature).

[0068] 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 working temperatures through two different Curie temperatures (the second Curie temperature and the third Curie temperature).

[0069] In this embodiment, the substrate layer 11 comprises stainless steel, the first Curie temperature is more than 600°C; the second Curie temperature is between 150°C and 550°C; the third Curie temperature is between 150°C and 550°C. The substrate layer 11 is mainly used to heat the aerosol-forming substrate. For this reason, the substrate layer 11 is enhanced in terms of eddy current and / or hysteresis loss and thus optimized in terms of heating efficiency.

[0070] 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.

[0071] The first layer 12 and the second layer 13 material include ferromagnetic metals, such as nickel and its alloys. Depending on the properties of the alloying elements, the Curie temperature of nickel alloys is in the range of about 260°C to 450°C, respectively. The Curie temperature in this range is ideal because it is approximately the same as the temperature to which the aerosol should be heated in order to generate an aerosol from the aerosol-forming substrate, but is still low enough to avoid local overheating or burning of the aerosol-forming substrate. During heating, the substrate layer 11 reaches the Curie temperature of the nickel alloy, and the magnetic properties of the materials of the first layer 12 and the second layer 13 will change from ferromagnetism to paramagnetism, accompanied by a sudden change in their resistance. Therefore, by monitoring the corresponding change in the current output by the induction power supply, it can be detected whether the first layer 12 and the second layer 13 have reached their Curie temperatures, and the induction heating element 1 is operated at the working temperature corresponding to different Curie temperatures through feedback control.

[0072] like Figure 1 As shown, in this embodiment, a third layer 14 and a fourth layer 15 are also 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.

[0073] 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.

[0074] The third layer 14 and the fourth layer 15 are provided for the purpose of improving the anti-sticking property and the anti-oxidation property of the induction heating element 1, and preventing the composite material from sticking to the aerosol-forming matrix during use. In actual use, the third layer 14 and the fourth layer 15 have the same material and the same thickness, and 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.

[0075] 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, the third layer 14 and the fourth layer 15 are respectively disposed on the outer sides of the first layer 12 and the second layer 13 .

[0076] 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.

[0077] 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.

[0078] 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.

[0079] like Figure 2 As shown, this embodiment also discloses a moxibustion product, comprising a matrix container 2, an aerosol cooling element 3 and an aerosol gathering element 4 arranged in sequence, and also comprising an induction heating element 1 of this embodiment for heating the aerosol-forming matrix;

[0080] An aerosol generating substrate 21 is installed in the substrate container 2. The aerosol generating substrate 21 includes a homogenized moxa material surrounded by a packaging material. The homogenized moxa material is in a gathered flocculent state. The induction heating element 1 is located in the substrate container 2 and in contact with the aerosol generating substrate. The aerosol gathering element 4 is an umbrella-shaped structure.

[0081] The moxibustion product is used in conjunction with an induction heating device, which includes an induction coil or sensor for generating an alternating electromagnetic field. The induction heating device is used to heat the induction heating element 1 of the moxibustion product, so that the induction heating element 1 heats the aerosol generating matrix 21 to generate an aerosol. The aerosol is cooled by the aerosol cooling element 3 and then flows into the aerosol gathering element 4, and finally acts on the human skin.

[0082] 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 length of the aerosol-forming substrate are roughly the same length, and the center line of the induction heating element 1 and the center line of the aerosol-forming substrate basically coincide.

[0083] In actual application, non-burning aromatherapy products, non-burning electric mosquito coil products and heated non-burning tobacco products can also be prepared, and at this time, only the material of the aerosol-forming matrix needs to be changed.

[0084] The above description is only a preferred embodiment of the present invention, and does not limit the patent protection scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention and the drawings, directly or indirectly used in other related technical fields, is also included in the protection scope of the present invention.

Claims

1. An induction heating element for heating an aerosol-forming substrate, characterized in that It comprises a substrate layer, a first layer and a second layer, wherein the first layer and the second layer are respectively arranged on both sides of the substrate layer and are closely connected to the substrate layer; The substrate layer is used for inductively heating the aerosol-forming substrate; 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 induction heating element has a stress-symmetrical structure.

2. An induction heating element for heating an aerosol-forming substrate according to claim 1, characterised in that The substrate layer comprises at least one of a ferromagnetic metal, a paramagnetic metal and a ferrimagnetic metal, and the substrate layer has a first Curie temperature; The first layer has a second Curie temperature, and the second layer has a third Curie temperature; The first Curie temperature is greater than the second Curie temperature and greater than the third Curie temperature.

3. An induction heating element for heating an aerosol-forming substrate according to claim 2, characterised in that 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.

4. An induction heating element for heating an aerosol-forming substrate according to claim 2, characterised in that The materials of the first layer and the second layer are different and the thicknesses are also different, and the second Curie temperature is different from the third Curie temperature; 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.

5. An induction heating element for heating an aerosol-forming substrate according to claim 1, characterised in that The substrate layer does not have a Curie temperature; 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; 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.

6. An induction heating element for heating an aerosol-forming substrate according to claim 2, characterised in that 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.

7. An induction heating element for heating an aerosol-forming substrate as claimed in claim 6, characterised in that The first layer includes a ferromagnetic metal, and the second Curie temperature is between 260°C and 450°C; the second layer includes a ferromagnetic metal, and the third Curie temperature is between 260°C and 450°C.

8. An induction heating element for heating an aerosol-forming substrate as claimed in claim 2 or 5, characterised in that It also includes a third layer and a fourth layer, 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, and the third layer and the fourth layer are anti-sticking materials with anti-oxidation function.

9. An induction heating element for heating an aerosol-forming substrate as claimed in claim 8, characterised in that 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, the third layer and the fourth layer are thermal decomposition products of polysilazane at 800°C, the thickness of the third layer and the fourth layer are both 5 μm, and the total thickness of the induction heating element is 77 μm.

10. A moxibustion product, characterized in that: comprising a substrate container, an aerosol cooling element and an aerosol gathering element arranged in sequence, and further comprising an induction heating element for heating an aerosol-forming substrate as claimed in any one of claims 1 to 9; An aerosol generating substrate is installed in the substrate container, the aerosol generating substrate comprises a homogenized moxa material surrounded by a packaging material, and the homogenized moxa material is in an aggregated flocculent state; the induction heating element is located in the substrate container and in contact with the aerosol generating substrate, and the aerosol aggregating element is an umbrella-shaped structure; The moxibustion 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 moxibustion product, so that the induction heating element heats the aerosol generating matrix to produce an aerosol. The aerosol is cooled by an aerosol cooling element and then flows into an aerosol gathering element, and finally acts on human skin.

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