Aerosol generating device and coil assembly thereof

Abstract

The invention provides an aerosol generating device and a coil assembly thereof, the aerosol generating device comprises a control assembly, the control assembly transmits an electric signal to the coil assembly through an electric connection part, the coil assembly comprises a ceramic substrate, a conductive heating body and a temperature feedback element, the ceramic substrate defines a heating cavity, and the conductive heating body is arranged in the heating cavity. The heating cavity is used for accommodating an aerosol forming substrate; the conductive heating body is arranged on the ceramic base body, and the conductive heating body heats the aerosol to form a substrate so as to generate aerosol; the temperature feedback element is arranged on the inner side or the outer side of the heating cavity and used for obtaining temperature related information of the conductive heating body and feeding back the temperature related information to the control assembly. The ceramic base body integrates the conductive heating body and the temperature feedback printed circuit, precision of temperature feedback control is achieved, real-time feedback adjustment can be conducted on the coil circuit according to the preset temperature, and stability and precision of the heating process are guaranteed.

Description

Technical Field

[0001] This application belongs to the field of novel tobacco products, specifically relating to an aerosol generating device and its coil assembly. Background Technology

[0002] Electromagnetic induction heating technology, due to its high heating efficiency, has begun to be applied in the field of low-temperature cigarette heating technology. An electromagnetic induction heating system generally includes an inductor coil, a resonant control circuit, and a magnetic induction heating element. An alternating current is generated by the resonant control circuit system and flows through the coil. Due to hysteresis losses and eddy current effects, the magnetic induction heating element generates heat. The magnetic induction heating element can be placed inside or outside the tobacco section of the cigarette. The heat generated by the magnetic induction heating element bakes and heats the tobacco material, producing an aerosol that can be inhaled.

[0003] Currently, inductors are typically formed by spirally winding a conductor material around the outside of the heating cavity. The conductor material is usually a multi-strand coil, but multi-strand coils have the following problems.

[0004] (1) The large size is not conducive to the miniaturization design of the appliance;

[0005] (2) Dimensional deviations are prone to occur during the winding and installation of multi-strand coils, making it difficult to guarantee the consistency and uniformity of coil performance;

[0006] (3) Since the heating chamber is a high-temperature environment, and the maximum temperature resistance of multi-strand coils is generally 150℃, long-term high-temperature environment can easily affect the stability of the coil.

[0007] (4) In the electromagnetic induction heating system, the coil generates a certain amount of heat due to its own resistance. The multi-strand coil is generally wound around the outside of the heating cavity. The heating cavity material generally has low thermal conductivity, and the coil and the cigarette are separated by the heating cavity and are far apart. Therefore, the heat generated by the coil itself cannot be effectively absorbed and utilized by the cigarette, resulting in low heat utilization rate.

[0008] To reduce energy loss in the coil, the coil material is generally made with low resistance and a low temperature coefficient of resistance. A lower temperature coefficient means less change in resistance with temperature, which is more conducive to system stability and reduces resistance loss. However, a low temperature coefficient means less resistance change with temperature, making it inaccurate to use changes in the coil material's resistance to indicate the coil's temperature; precise temperature control is impossible. Summary of the Invention

[0009] In view of this, the purpose of this application is to provide an aerosol generating device and its coil assembly to solve the above problems.

[0010] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0011] In a first aspect, this application provides a coil assembly for an aerosol generating device. The aerosol generating device includes a control assembly, which transmits electrical signals to the coil assembly via an electrical connection. The coil assembly includes a ceramic substrate, a conductive heating element, and a temperature feedback element. The ceramic substrate encloses a heating cavity for containing an aerosol forming matrix. The conductive heating element is disposed on the ceramic substrate and heats the aerosol forming matrix to generate aerosol. The temperature feedback element is disposed inside or outside the heating cavity for acquiring temperature correlation information of the conductive heating element and feeding it back to the control assembly.

[0012] Furthermore, the temperature coefficient of resistance of the temperature feedback element is greater than 2000 ppm / ℃, and the resistance of the temperature feedback element is 0.3-2.5Ω or 2.5-5Ω.

[0013] Furthermore, the temperature feedback element and conductive heating element are constructed by spirally printing a metal heating paste onto a ceramic substrate using a screen printing process.

[0014] Furthermore, the number of turns of the conductive heating element in the spiral printing is 3-10 or 10-18.

[0015] Furthermore, the coating thickness of the conductive heating element is 0.01-0.5 mm, and the width is 0.1-5 mm.

[0016] Furthermore, the conductive heating element and temperature feedback element are located at any position on the inner surface, outer surface, or intermediate region of the ceramic substrate.

[0017] Furthermore, the temperature feedback element is electrically connected to the control components via soldered leads.

[0018] Furthermore, the conductive heating element and the heating cavity are integrally formed.

[0019] Furthermore, the resistance of the conductive heating element is less than 1.5Ω, and the temperature coefficient of resistance of the conductive heating element is less than 2000 ppm / ℃.

[0020] Secondly, this application provides an aerosol generating apparatus, which includes the coil assembly as described above.

[0021] Among them, aerosol-generating products are smoking products, including aerosol-forming matrix, which generates aerosols through heating that can be directly inhaled into the lungs of the user through the user's mouth.

[0022] Preferably, the aerosol forming matrix is ​​a solid aerosol forming matrix. The aerosol forming matrix may include both solid and liquid components.

[0023] Preferably, the aerosol-forming matrix includes nicotine. In some preferred embodiments, the aerosol-forming matrix includes tobacco.

[0024] Preferably, each receptor is located inside a plug that is in direct contact with the aerosol-forming material.

[0025] A sensor is a material that can convert electromagnetic energy into heat. When placed in a undulating electromagnetic field, the eddy currents induced in the sensor cause it to heat up. When an elongated sensor is positioned in thermal contact with an aerosol-forming matrix, the aerosol-forming matrix is ​​heated by the sensor.

[0026] The aerosol generating article is designed to engage with an electrically operated aerosol generating device, including an induction heating source. The induction heating source or sensor generates a fluctuating electromagnetic field to heat a sensor located within the fluctuating electromagnetic field. In use, the aerosol generating article engages with the aerosol generating device such that the sensor is located within the fluctuating electromagnetic field generated by the sensor.

[0027] The length of the receptor is significantly greater than its width or thickness, for example, more than twice its width or thickness. Therefore, the receptor can be described as an elongated receptor. The receptor can be arranged generally longitudinally within the aerosol-generating matrix.

[0028] This means that the length of the elongated receptors is arranged approximately parallel to the longitudinal direction of the aerosol-generating matrix, for example, within plus or minus 10 degrees of the longitudinal direction of the aerosol-generating matrix.

[0029] In a preferred embodiment, the elongation receptor may be located at the radial center within the aerosol generating matrix and extend along the longitudinal axis of the aerosol generating matrix.

[0030] The receptor can be made of any material that can be heated inductively to a temperature sufficient to generate an aerosol matrix. Preferred receptors include metals or carbon.

[0031] Preferred sensors may comprise ferromagnetic materials, such as ferrite, ferromagnetic steel, or stainless steel. Suitable sensors may be aluminum or may include aluminum. Preferred sensors may be made of 400 series stainless steel, such as grade 410, 420, or 430 stainless steel.

[0032] Different materials will consume different amounts of energy when placed in an electromagnetic field with similar frequency and field strength. Therefore, the parameters of the sensor, such as material type, length, width, and thickness, can be varied within a known electromagnetic field to provide the required energy consumption.

[0033] The preferred sensor may be heated to a temperature exceeding 250 degrees Celsius. A suitable sensor may include a non-metallic core having a metallic layer disposed on the non-metallic core, such as metallic traces formed on the surface of a ceramic core.

[0034] The sensor may have an outer protective layer, such as a ceramic or glass protective layer encapsulating the elongated sensor, thereby forming a complete heating element. The sensor may include a protective coating formed of glass, ceramic, or inert metal on the core of the sensor material.

[0035] The receptors are arranged to be in thermal contact with the aerosol-forming matrix. Therefore, when the receptors are heated, the aerosol-forming matrix is ​​heated and aerosols are formed.

[0036] In one embodiment, a heating element including a sensor is inserted into an aerosol forming matrix, and the aerosol generating apparatus may include one or more elongated heating elements.

[0037] In another embodiment, the aerosol generating matrix may contain receptors.

[0038] Alternatively, the aerosol generating matrix may include multiple receptors, and the receptors may be elongated, granular, network-shaped, radial, tubular, hourglass-shaped, spiral, etc.

[0039] The aerosol generating device can generate a fluctuating electromagnetic field between approximately 1 MHz and 30 MHz, for example, between 2 MHz and 10 MHz, or for example, between 5 MHz and 7 MHz, through the induction coil of the induction emitter.

[0040] Preferably, the aerosol generating device is capable of generating a wave electromagnetic field with a field strength (H field) between 1 kA / m and 5 kA / m, for example between 2 kA / m and 3 kA / m, for example about 2.5 kA / m.

[0041] An aerosol generator is a portable or handheld device that can be comfortably held between the fingers of one hand. The shape of the aerosol generator is generally cylindrical. The aerosol generator can have a length between approximately 70 mm and approximately 120 mm.

[0042] An aerosol generating apparatus is used to describe an apparatus that interacts with an aerosol forming matrix of an aerosol generating article to generate an aerosol.

[0043] Preferably, the aerosol generating device is a heated smoking device that interacts with the aerosol generating matrix of the aerosol generating product to generate an aerosol that can be directly inhaled into the user's lungs through the user's mouth.

[0044] The power source can be any suitable power source, such as a DC voltage source, like a battery. In one embodiment, the power source is a lithium-ion battery. Alternatively, the power source can be a nickel-metal hydride battery, a nickel-cadmium battery, or a lithium-based battery, such as a lithium cobalt, lithium iron phosphate, lithium titanate, or lithium polymer battery.

[0045] The control element can be a simple switch. Alternatively, the control element can be a circuit and may include one or more microprocessors or microcontrollers.

[0046] An aerosol generation system may include an aerosol generation device and one or more aerosol generation articles, wherein the aerosol generation device is configured with a corresponding number of coil assemblies to house the aerosol generation articles.

[0047] As can be seen from the above technical solution, the advantages and positive effects of the aerosol generating device and its coil assembly proposed in this application are as follows:

[0048] 1. The coil assembly of this application achieves an ingenious integrated design of the conductive heating element and the heating cavity. This design significantly reduces the distance between the conductive heating element and the cigarette. At the same time, the heating cavity substrate is made of ceramic material, whose excellent thermal conductivity allows the heat generated by the coil itself to be transferred to the tobacco segment more efficiently, greatly improving the heat utilization efficiency.

[0049] 2. The integrated design of the conductive heating element and the heating cavity not only optimizes the structural layout but also helps to reduce the overall volume, providing strong support for the miniaturization design of heating appliances.

[0050] 3. The heating chamber substrate is made of ceramic material, which exhibits better stability in high-temperature environments, ensuring the reliability and durability of the heating process.

[0051] 4. The coil adopts an innovative process of directly printing heating paste onto the ceramic substrate, which effectively avoids the dimensional deviation problem that may occur during the winding and installation of traditional conductive heating elements, and significantly improves the consistency and uniformity of coil performance.

[0052] 5. The unique design of the integrated co-fired ceramic substrate is ingenious. Compared with multi-strand coils, it is thinner, but has a larger equivalent cross-sectional area and lower resistance, thereby significantly reducing resistance loss and improving energy utilization.

[0053] 6. The co-fired ceramic substrate integrates a conductive heating element and a temperature feedback printed circuit, achieving precise temperature feedback control. It can adjust the coil circuit in real time according to the preset temperature, ensuring the stability and accuracy of the heating process. Attached Figure Description

[0054] The above description of this application and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solutions.

[0055] Figure 1 This is the aerosol generating apparatus provided in this application;

[0056] Figure 2 This is the coil assembly provided in this application.

[0057] The reference numerals in the attached figures are explained as follows:

[0058] Aerosol generating device: 10;

[0059] Coil assembly: 11;

[0060] Conductive heating element: 11a;

[0061] Ceramic matrix: 11b;

[0062] Temperature feedback element: 11c;

[0063] Power supply: 12;

[0064] Control components: 13;

[0065] Heating chamber: 14;

[0066] Aerosol forming matrix: 20;

[0067] Receptor: 20a. Detailed Implementation

[0068] The detailed features and advantages of this application are described below in the specific embodiments. The content of this description is sufficient to enable any person skilled in the art to understand the technical content of this application and implement it accordingly. Based on the specification, claims and drawings disclosed in this specification, a person skilled in the art can easily understand the related objectives and advantages of this application.

[0069] The invention will now be described with reference to the accompanying drawings, in which similar reference numerals denote similar elements. While specific structures and arrangements are discussed, it should be understood that this is done merely for illustrative purposes. Those skilled in the art will recognize that other structures and arrangements can be used without departing from the spirit and scope of the invention. It will be apparent to those skilled in the art that the invention can also be used in a variety of other applications.

[0070] In this specification and claims, several terms will be used, and unless otherwise indicated, these terms will be defined to have the following meanings:

[0071] The singular forms “a” and “the” include their corresponding plural forms. “At least one” means one or more, and “more” means two or more. “At least one of the following” or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can be expressed as: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0072] All figures used to represent component amounts, properties (e.g., molecular weight), reaction conditions, etc., should be considered to be modified in all cases by the terms "within the unavoidable margin of error" or "about". Therefore, the numerical values ​​set forth herein are approximate and may vary depending on the desired properties sought to be obtained by the present invention. The principles of equivalents, which are applied to a minimum and not intended to limit the scope of the claims, should be applied, for example, each value should be interpreted at least according to the reported significant digits and by applying conventional rounding techniques.

[0073] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0074] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0075] Unless otherwise indicated, the following abbreviations have the following meanings, and any other abbreviations used herein but not defined have their generally accepted standard meanings:

[0076] All other terms used herein for special definition are intended to have the general meaning understood by one of ordinary skill in the art, and in particular, meaning that one of ordinary skill in the art, upon reading the claims, specification and drawings of this patent, can directly and without doubt determine how the technical solution of this patent can be implemented.

[0077] Even if there are incomplete descriptions, omissions, or ambiguities in the grammar, words, punctuation, graphics, symbols, etc. of the claims, specification, and drawings of this patent, a person skilled in the art can still arrive at the only correct understanding by reading the claims, specification, and drawings as a whole without extensive reasoning or experimentation, and effectively exclude various incorrect interpretations that are not aimed at achieving the purpose of this patent.

[0078] Those skilled in the art would first choose to read the claims, specification, and drawings of this patent to reasonably interpret the terms; secondly, they would choose to refer to the relevant definitions in other documents published by the applicant before the filing date to reasonably interpret the terms; thirdly, they would choose the references cited in this patent to reasonably interpret the terms; and finally, they would choose to combine the technical dictionaries, technical manuals, reference books, textbooks, national or industry technical standards, etc., commonly used by those skilled in the art to reasonably interpret the terms.

[0079] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0080] Please refer to Figure 1 This application provides an aerosol generating device 10, which may include a coil assembly 11, a power supply 12, and a control assembly 13. The control assembly 13 transmits electrical signals to the coil assembly 11 through an electrical connection.

[0081] Among them, such as Figure 2 As shown, the coil assembly 11 includes a ceramic substrate 11b, a conductive heating element 11a, and a temperature feedback element 11c. The ceramic substrate 11b encloses a heating cavity 14, which is used to contain an aerosol forming matrix 20. The conductive heating element 11a is disposed on the ceramic substrate 11b and heats the aerosol forming matrix 20 to generate an aerosol.

[0082] The coil assembly 11 is responsible for generating a magnetic field from electrical energy, which, together with the sensor 20a, heats the aerosol forming matrix 20. The sensor 20a can be rapidly heated while the temperature is precisely controlled by the control assembly 13 to avoid overheating and damage to the matrix, thereby preserving the flavor and texture of the matrix.

[0083] Specifically, the controller is electrically connected to the coil to generate a high-frequency alternating current to provide energy to the heating cavity 14 through the coil (conductive heating element 11a). The magnetic field generated by the coil heats the aerosol matrix in the heating cavity 14 through hysteresis loss and eddy current effect. The sensor 20a can be arranged inside or outside the tobacco segment of the cigarette.

[0084] Meanwhile, a magnetic shielding component is provided between the coil and the outer shell of the aerosol generating device 10. This component can be made of high magnetic permeability materials such as thin sheets or coatings, in order to reduce magnetic leakage, ensure magnetic field strength, and improve energy utilization.

[0085] The heating method of the aerosol generating device 10 can also be internal heating, which means that the sensor 20a is at least partially located inside the aerosol forming matrix 20 and directly heats the aerosol forming matrix 20.

[0086] Additionally, auxiliary structures such as a heat spreader layer and a dielectric layer can be added as needed to improve heating uniformity and efficiency. Because the sensor 20a is in closer contact with the matrix, the required heating temperature can be reached more quickly. The internal heating method allows for more direct heating of the aerosol-generating matrix, improving heating efficiency.

[0087] The coil assembly 11 of this application, in conjunction with a sensor 20a disposed outside the aerosol forming matrix 20, forms an external heating method. External heating heats the matrix through heat conduction or radiation. External heating typically involves designing a specific heating cavity 14 or tubular body to contain the aerosol forming matrix 20. The coil assembly 11 is disposed outside the heating cavity 14 or tubular body.

[0088] It is understandable that external heating methods can also be combined with structures such as heat insulation pipes and support frames to improve the uniformity and stability of heating. External heating methods can avoid direct contact between the sensor 20a and the aerosol forming matrix 20, reducing the contamination and damage of the matrix to the sensor 20a. By rationally designing the heating cavity 14 and the heat insulation structure, uniform heating of the matrix can be achieved, improving the quality of aerosol generation.

[0089] It is understood that the aerosol generating device 10 of this application may also combine internal heating and external heating to heat the aerosol generating matrix together, thereby improving heating uniformity and heating efficiency.

[0090] The temperature feedback element 11c can be located inside or outside the heating cavity 14, or in the middle area between the inside and outside of the heating cavity 14, to obtain the temperature correlation information of the conductive heating element 11a and feed it back to the control component 13.

[0091] The temperature feedback element 11c and the conductive heating element 11a are constructed by spirally printing a metal heating paste onto a ceramic substrate 11b using a screen printing process.

[0092] For example, the metal heating paste can be one or more of tungsten, manganese, molybdenum, gold, silver, copper, rhenium, palladium, niobium, tantalum, aluminum, chromium, iron, silicon, titanium, zinc, carbon, nickel, cobalt, and boron.

[0093] The number of turns of the conductive heating element 11a in the spiral printing is 3-10 or 10-18, the coating thickness of the conductive heating element 11a is 0.01-0.5mm, and the width is 0.1-5mm.

[0094] The resistance of the heating paste in the conductive heating element 11a can be less than 1.5Ω.

[0095] Preferably, the resistance of the heating paste in the conductive heating element 11a is less than 0.1Ω. It can be understood that the lower the resistance of the heating paste in the conductive heating element 11a, the less heat is lost by the coil itself, thus improving the efficient utilization of energy.

[0096] The temperature coefficient of resistance (TCR) of the heating paste of the conductive heating element 11a is less than 2000 ppm / ℃. The smaller the temperature coefficient of resistance, the smaller the change in resistance of the metal heating paste with temperature, which is more conducive to the stability of the electromagnetic heating system and reduces resistance loss.

[0097] The conductive heating element 11a and the temperature feedback element 11c are located at any position on the inner surface, outer surface or middle region of the ceramic substrate 11b.

[0098] The heating cavity 14, formed by the ceramic substrate 11b, can be cylindrical. The inner diameter of the heating cavity 14 generally does not exceed 9 mm, and the outer diameter does not exceed 16 mm. The cavity wall thickness is 0.1-5 mm, and the height is 5-30 mm.

[0099] The ceramic matrix 11b can be an oxide-based ceramic matrix 11b, a silicon nitride-based ceramic matrix 11b, or a carbide-based ceramic matrix 11b. The specific type of ceramic matrix 11b can be selected according to the application scenario, and this application does not limit it.

[0100] The two ends of the temperature feedback element 11c are electrically connected to the control component 13 through solder leads. The temperature coefficient of resistance (TCR) of the temperature feedback element 11c is greater than 2000 ppm / ℃, and the resistance of the temperature feedback element 11c is 0.3-2.5Ω or 2.5-5Ω.

[0101] Preferably, the temperature coefficient of resistance of the temperature feedback element 11c is greater than 3000 ppm / ℃. It can be understood that the larger the temperature coefficient of resistance of the temperature feedback element 11c, the greater the change in resistance of the metal heating paste with temperature, which is beneficial for improving the accuracy of temperature feedback.

[0102] It is understood that the coil assembly 11 of this application constitutes an electromagnetic heating system. Due to the skin effect of high-frequency current in the electromagnetic heating system, the current will concentrate on the surface of the coil conductor, while almost no current passes through the center part of the conductor. This is equivalent to the cross-section of the wire being reduced and the resistance being increased, thereby generating a certain resistance loss and causing a reduction in energy conversion efficiency.

[0103] Therefore, the present invention uses conductive metal heating paste to print coils, which results in a coil thickness that is smaller than that of multi-strand coils, a larger equivalent cross-sectional area, and lower resistance, thus reducing resistance loss.

[0104] The control logic of the aerosol generating device 10 in this application during operation is as follows:

[0105] The control component 13 provides a certain voltage to the conductive heating element 11a and generates a high-frequency alternating current. The magnetic field generated by the conductive heating element 11a heats the sensor 20a inside / outside the aerosol forming matrix 20 in the heating cavity 14 through hysteresis loss and eddy current effect. At the same time, the self-heating of the conductive heating element 11a also heats the aerosol generating matrix. Under the combined action of the two, the aerosol forming matrix 20 is heated to form an aerosol.

[0106] The control component 13 provides a certain current through the power supply 12 to flow through the temperature feedback printed circuit (temperature feedback element 11c). Since the temperature feedback printed circuit is printed on the ceramic substrate 11b, the temperature of the ceramic substrate 11b can affect the resistance value of the temperature feedback circuit. The temperature T of the ceramic coil substrate can be found in a table or calculated by using the resistance value and the temperature coefficient of resistance.

[0107] The control component 13 acquires the temperature T of the temperature feedback printed circuit and adjusts the voltage supplied to the coil printed circuit according to the required temperature of the ceramic substrate 11b based on the temperature T, so that the temperature of the ceramic substrate 11b is always in a feedback regulation state, thereby heating according to the set temperature.

[0108] Based on the same inventive concept, this application also provides a method for preparing the coil assembly 11, the method comprising:

[0109] Step S1: Obtain ceramic substrate 11b, metal paste and ceramic glaze slurry.

[0110] The ceramic matrix 11b is made of alumina, aluminum nitride, or silicon oxide. The metal paste used for screen printing includes metal powders (silver, copper, etc.) and MoSi2 powder, organic solvents (ethanol, dimethyl thionamide, cyclohexane, etc.), binders (polyamide resin, polyurethane resin, polyester resin, etc.), leveling agents (siloxanes, polyether leveling agents, etc.), activators (hexadecyltrimethylammonium chloride, alkylbenzene sulfonates, etc.), and additives (talc, calcium chloride, sodium borate, etc.).

[0111] Calculated on a mass percentage basis, the composition typically includes 40-60 parts metal powder, 10-20 parts MoSi2 powder, 10-20 parts organic solvent, 5-10 parts binder, 1-5 parts leveling agent, 1-3 parts activator, and 0.5-3 parts additives.

[0112] The ceramic glaze used can be made from powders such as kaolin, feldspar, quartz, and dolomite, with a mass fraction between 20 and 50 parts. Sodium-calcium or potassium-sodium glass is selected as the molten phase, with a content between 10 and 30 parts.

[0113] At the same time, add 5-10 parts of metal oxides (calcium oxide, aluminum oxide, iron oxide, etc.), 2-5 parts of flow agent (silicate, talc, etc.), 20-30 parts of solvent and other additives (water, ethanol, etc.).

[0114] Weigh the metal slurry raw materials and ceramic glaze raw materials according to the following ratio and place them separately into a ball mill jar. The weight ratio of raw materials to agate balls is 1:2. Mix the raw materials evenly to obtain metal slurry and ceramic glaze slurry.

[0115] Step S2: Print the metal paste onto the surface of the ceramic substrate 11b to form a coil printed circuit.

[0116] The surface of the hollow ceramic tube is cleaned, and a circuit is printed on the surface of the hollow ceramic tube using a metal paste through screen printing. The circuit is in the shape of a coil, forming a conductive heating element 11a. A layer of ceramic glaze is then evenly coated onto the printed circuit using a spraying method, and subsequently dried.

[0117] Step S3: Spray ceramic glaze slurry onto the coil printed circuit and fire it to obtain coil assembly 11.

[0118] Specifically, step S3 includes:

[0119] Step S31: Spray ceramic glaze slurry onto the surface of ceramic substrate 11b to obtain coil ceramic substrate 11b.

[0120] Step S32: Place the coil ceramic substrate 11b into a muffle furnace for firing to obtain the coil assembly 11.

[0121] Specifically, the hollow ceramic tube with printed circuitry and coated with ceramic glaze is placed in a muffle furnace for firing. During the firing process, a vacuum environment is maintained, the heating rate is 3 ℃ / min, the firing temperature is 700~950 ℃, the holding time is 2 hours, and the cooling rate is 5 ℃ / min.

[0122] Metal electrodes are connected to printed circuit boards via welding, bonding, or other methods to ensure electrical performance.

[0123] It is understood that the coil assembly 11 based on electromagnetic induction heating in this invention has the advantages of fast heating rate and high thermal efficiency. Compared with ceramic heating elements based on resistance heating, the heating element based on electromagnetic induction heating provides more uniform heating and has a longer service life.

[0124] During the preparation process, MoSi2 powder was incorporated into the metal slurry. This not only increased the firing temperature of the metal coil and prevented it from falling off, but also prevented the temperature coefficient of resistance from increasing due to oxidation of the metal coil during high-temperature firing.

[0125] Example 1:

[0126] Weigh out 50 parts copper powder, 15 parts MoSi2 powder, 15 parts ethanol, 10 parts polyurethane resin, 5 parts polyether leveling agent, 2 parts alkylbenzene sulfonate, and 3 parts talc to prepare a metal slurry. Weigh out 40 parts kaolin, 20 parts sodium potassium glass powder, 30 parts water, 5 parts calcium oxide, and 5 parts talc to prepare a ceramic glaze slurry.

[0127] Weigh the metal slurry raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the metal slurry. Simultaneously, weigh the ceramic glaze raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the ceramic glaze slurry.

[0128] The surface of the alumina tube is cleaned, and a circuit is printed on the surface of the alumina tube using metal paste as printing ink through screen printing. The circuit is in the shape of a coil with 30 turns. A layer of ceramic glaze is then evenly coated onto the alumina tube with the fired circuit using a spraying method, and then allowed to dry.

[0129] The alumina tube with printed circuit and coated with ceramic glaze is placed in a muffle furnace for firing. During the firing process, a vacuum environment is maintained, the heating rate is 3 ℃ / min, the firing temperature is 800 ℃, the holding time is 2 hours, and the cooling rate is 5 ℃ / min.

[0130] Metal electrodes are connected to the printed circuit board via welding, bonding, or other methods to ensure electrical performance. After connecting power supply 12 and applying a current of 2A, a metal sheet (magnetic induction heating element) is placed inside the hollow ceramic tube. The time required for the metal sheet to heat up to 200 ℃ is 3.4 seconds, and the time required for the metal sheet to heat up to 300 ℃ is 4.8 seconds.

[0131] Example 2:

[0132] Weigh out 45 parts copper powder, 20 parts MoSi2 powder, 15 parts ethanol, 10 parts polyurethane resin, 5 parts polyether leveling agent, 2 parts alkylbenzene sulfonate, and 3 parts talc to prepare a metal slurry. Weigh out 40 parts kaolin, 20 parts sodium potassium glass powder, 30 parts water, 5 parts calcium oxide, and 5 parts talc to prepare a ceramic glaze slurry.

[0133] Weigh the metal slurry raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the metal slurry. Simultaneously, weigh the ceramic glaze raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the ceramic glaze slurry.

[0134] The surface of the alumina tube is cleaned, and a circuit is printed on the surface of the alumina tube using metal paste as printing ink through screen printing. The circuit is in the shape of a coil with 30 turns. A layer of ceramic glaze is then evenly coated onto the alumina tube with the fired circuit using a spraying method, and then allowed to dry.

[0135] The alumina tube with printed circuit and coated with ceramic glaze is placed in a muffle furnace for firing. During the firing process, a vacuum environment is maintained, the heating rate is 3 ℃ / min, the firing temperature is 850 ℃, the holding time is 2 hours, and the cooling rate is 5 ℃ / min.

[0136] Metal electrodes are connected to the printed circuit board via welding, bonding, or other methods to ensure electrical performance. After connecting power supply 12, a current of 2A is applied. A metal sheet is placed in the hollow ceramic tube. The time required for the metal sheet to heat up to 200 ℃ is 3.2 seconds, and the time required for the metal sheet to heat up to 300 ℃ is 4.7 seconds.

[0137] Example 3:

[0138] Weigh out 45 parts copper powder, 20 parts MoSi2 powder, 10 parts polyurethane resin, 5 parts polyether leveling agent, 2 parts alkylbenzene sulfonate, and 3 parts talc to prepare a metal slurry. Weigh out 40 parts kaolin, 20 parts sodium potassium glass powder, 30 parts water, 5 parts calcium oxide, and 5 parts talc to prepare a ceramic glaze slurry.

[0139] Weigh the metal slurry raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the metal slurry. Simultaneously, weigh the ceramic glaze raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the ceramic glaze slurry.

[0140] The surface of the alumina tube is cleaned, and a circuit is printed on the surface of the alumina tube using metal paste as printing ink through screen printing. The circuit is in the shape of a coil with 40 turns. A layer of ceramic glaze is then evenly coated onto the alumina tube with the fired circuit using a spraying method, and then allowed to dry.

[0141] The alumina tube with printed circuit and coated with ceramic glaze is placed in a muffle furnace for firing. During the firing process, a vacuum environment is maintained, the heating rate is 3 ℃ / min, the firing temperature is 850 ℃, the holding time is 2 hours, and the cooling rate is 5 ℃ / min.

[0142] Metal electrodes are connected to the printed circuit board via welding, bonding, or other methods to ensure electrical performance. After connecting power supply 12, a current of 2A is applied. A metal sheet is placed in the hollow ceramic tube. The time required for the metal sheet to heat up to 200 ℃ is 3.1 seconds, and the time required for the metal sheet to heat up to 300 ℃ is 4.4 seconds.

[0143] Example 4:

[0144] Weigh out 45 parts silver powder, 20 parts MoSi2 powder, 10 parts polyurethane resin, 5 parts polyether leveling agent, 2 parts alkylbenzene sulfonate, and 3 parts talc to prepare a metal slurry. Weigh out 40 parts kaolin, 20 parts sodium potassium glass powder, 30 parts water, 5 parts calcium oxide, and 5 parts talc to prepare a ceramic glaze slurry.

[0145] Weigh the metal slurry raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the metal slurry. Simultaneously, weigh the ceramic glaze raw materials according to the specified ratio and place them in a ball mill jar, with a raw material to agate balls weight ratio of 1:2. Mix in a ball mill at 300 rpm for 6 hours to ensure uniform mixing and obtain the ceramic glaze slurry.

[0146] The surface of the alumina tube is cleaned, and a circuit is printed on the surface of the alumina tube using metal paste as printing ink through screen printing. The circuit is in the shape of a coil with 40 turns. A layer of ceramic glaze is then evenly coated onto the alumina tube with the fired circuit using a spraying method, and then allowed to dry.

[0147] The alumina tube with printed circuit and coated with ceramic glaze is placed in a muffle furnace for firing. During the firing process, a vacuum environment is maintained, the heating rate is 3 ℃ / min, the firing temperature is 850 ℃, the holding time is 2 hours, and the cooling rate is 5 ℃ / min.

[0148] Metal electrodes are connected to the printed circuit board via welding, bonding, or other methods to ensure electrical performance. After connecting power supply 12, a current of 2A is applied. A metal sheet is placed in the hollow ceramic tube. The time required for the metal sheet to heat up to 200 ℃ is 2.9 seconds, and the time required for the metal sheet to heat up to 300 ℃ is 4.1 seconds.

[0149] In this specification, references to "an embodiment" or "a specific implementation" mean that a particular feature, structure, or characteristic described in connection with that embodiment / specific implementation is included in at least one embodiment / specific implementation of the invention. Therefore, the phrase "in one embodiment / specific implementation" appearing in various places in this specification does not necessarily refer to the same embodiment / setting, but rather to potentially different embodiments. Furthermore, specific features, structures, or characteristics may be combined in one or more embodiments / settings in any suitable manner, as will be apparent to those skilled in the art from this disclosure.

[0150] Similarly, it should be understood that in the above description of exemplary embodiments / specific implementations of the invention, various features of the invention are sometimes combined in a single embodiment / specific implementation or its figures and description, with the aim of simplifying the disclosure and aiding in the understanding of one or more of the various aspects of the invention. However, the method of description in this patent should not be construed as reflecting an intention that the claimed features of the invention are more than those expressly stated in each claim, except where explicitly stated otherwise or in obvious technical contradiction or exclusion. Rather, the inventive aspect reflected in the claims lies in not all the features of a single foregoing disclosed embodiment / specific implementation. Therefore, the claims following the detailed description are expressly incorporated herein by reference, each claim existing independently as a separate embodiment / specific implementation of the invention.

[0151] Furthermore, while some embodiments / specific implementations described herein include, but are not limited to, other features included in other embodiments / specific implementations, combinations of features from different embodiments / specific implementations are intended to be within the scope of the invention and form different embodiments / specific implementations, as will be understood by those skilled in the art. For example, in the following claims, embodiments / specific implementations of any claim can be used in any combination.

[0152] The terms and expressions used in this specification are for illustrative purposes and not for limitation. In using these terms and expressions, it is not intended to exclude any equivalents of the features or portions thereof shown and described, but rather to recognize that various modifications may be possible within the scope of the invention.

[0153] Therefore, it should be understood that although the invention has been specifically disclosed through preferred embodiments, exemplary embodiments and optional features, those skilled in the art may take variations or modifications of the concepts disclosed herein, and such variations and modifications are therefore considered to be within the scope of the invention as defined by the appended claims.

[0154] The specific embodiments given in this specification are examples of useful implementations of the present invention. It will be apparent to those skilled in the art that the present invention can be implemented using many variations of the devices, device components, and method steps disclosed in this specification.

[0155] The foregoing description of specific embodiments fully discloses the general features of the present invention, enabling others to easily modify and / or adapt such specific embodiments for various applications by applying knowledge within the scope of the art, without conducting excessive experimentation and without departing from the general concept of the present invention.

[0156] Therefore, based on the teachings and guidance provided herein, it is intended that such modifications and alterations be included within the meaning and scope of equivalents of the disclosed embodiments. It should be understood that the wording or terminology used herein is for descriptive purposes and is not intended to be limiting; thus, the wording or terminology in this specification will be interpreted by those skilled in the art based on the foregoing teachings and guidance.

[0157] Furthermore, the scope of the invention should not be limited to any of the exemplary embodiments described above, but is defined solely by the appended claims and their equivalents.

Claims

1. A coil assembly for an aerosol generating device, the aerosol generating device including a control component, the control component transmitting an electrical signal to the coil assembly via an electrical connection portion, characterized in that, The coil assembly includes: a ceramic substrate, a conductive heating element, and a temperature feedback element. The ceramic matrix encloses a heating cavity, which is used to contain aerosols to form a matrix. The conductive heating element is disposed on the ceramic substrate, and the conductive heating element heats the aerosol to form a matrix, thereby generating aerosol; The temperature feedback element is disposed on the inner side or the outer side of the heating cavity, and is used to obtain the temperature correlation information of the conductive heating element and feed it back to the control component.

2. The coil assembly of the aerosol generating device according to claim 1, characterized in that, The temperature coefficient of resistance of the temperature feedback element is greater than 2000ppm / ℃, and the resistance of the temperature feedback element is 0.3-2.5Ω or 2.5-5Ω.

3. The coil assembly of the aerosol generating device according to claim 1, characterized in that, The temperature feedback element and the conductive heating element are constructed by spirally printing a metal heating paste onto the ceramic substrate using a screen printing process.

4. The coil assembly of the aerosol generating device according to claim 3, characterized in that, The number of turns of the conductive heating element in the spiral printing is 3-10 or 10-18.

5. The coil assembly of the aerosol generating device according to claim 3, characterized in that, The coating thickness of the conductive heating element is 0.01-0.5 mm, and the width is 0.1-5 mm.

6. The coil assembly of the aerosol generating device according to claim 1, characterized in that, The conductive heating element and the temperature feedback element are located at any position on the inner surface, outer surface, or intermediate region of the ceramic substrate.

7. The coil assembly of the aerosol generating device according to claim 1, characterized in that, The temperature feedback element is electrically connected to the control component via solder leads.

8. The coil assembly of the aerosol generating device according to claim 1, characterized in that, The conductive heating element is integrally formed with the heating cavity.

9. The coil assembly of the aerosol generating device according to claim 1, characterized in that, The resistance of the conductive heating element is less than 1.5Ω, and the temperature coefficient of resistance of the conductive heating element is less than 2000ppm / ℃.

10. An aerosol generating device, characterized in that, The aerosol generating device includes a coil assembly as described in any one of claims 1-9.

Images