Heating module, preparation method of heating module and aerosol generating device

Abstract

One embodiment of the present application provides a heating module comprising: a heating body configured to generate resistive Joule heat by a current, or to be induced in a varying magnetic field to form eddy current heating; and the first heat diffusion body covers and is integrally connected to at least part of the surface of the heating body through sintering. The first heat diffusion body covers and is integrally connected to at least part of the surface of the heating body through sintering, so that the heating body is in full contact with the first heat diffusion body, the heat conduction efficiency is high, and the structural reliability is high.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of heating modules, and more particularly to a heating module and a method for preparing the heating module. Background Art

[0002] Traditional cigarette products produce a large amount of tobacco mist by burning tobacco during use, which volatilizes nicotine and other effective ingredients for users to inhale. At the same time, they also produce harmful substances such as tar and carbon monoxide due to incomplete combustion, which will cause great health damage to users. Therefore, the heating method of low-temperature heating without combustion has attracted the attention of tobacco consumers because it can reduce health hazards. Common methods of low-temperature heating without combustion mainly include resistance heating, electromagnetic heating and infrared heating, which mainly achieve the heating of aerosol-generating products by heat conduction and heat radiation. In recent years, the airflow heating method has gradually attracted the attention of the industry. Airflow heating mainly uses convection to achieve the heating of aerosol-generating products.

[0003] One of the current airflow heating methods uses ceramic and other heat-conducting materials to mechanically process a large number of airflow channels and a receiving cavity for placing a heating element. The heating element is arranged inside the receiving cavity and conducts heat to the heat-conducting material. The heat-conducting material then heats a large number of airflow channels passing through its internal airflow channels, so that the heated hot air enters the interior of the aerosol generating product to generate aerosol for the user to inhale. This solution is usually difficult to ensure the efficiency of heat conduction between the heat-conducting material and the heating element. Summary of the invention

[0004] One embodiment of the present application provides a heating module including a heating element, which is configured to generate resistive Joule heat by passing electric current, or be induced in a changing magnetic field to form eddy current heating; and a first heat diffuser, which covers and is integrally connected to at least a portion of the surface of the heating element by sintering.

[0005] In some embodiments, an insulating layer is disposed on the surface of the heating element, and the insulating layer is disposed between the first heat diffuser and the heating element, so that there is thermal conduction but no electrical connection between the first heat diffuser and the heating element.

[0006] In some embodiments, the insulating layer includes an insulating material attached to the surface of the heating element, wherein the insulating material includes glaze, glass or silicon dioxide.

[0007] In some embodiments, the first heat diffuser completely covers the heat generating element.

[0008] In some embodiments, the first heat diffuser is provided with a plurality of through-going airflow channels in a region originally far away from the heating element, and the airflow channels are capable of allowing air to pass through.

[0009] In some embodiments, the heating element includes a heating wire in the shape of a spiral coil, and the heating wire generates resistive Joule heat when an electric current passes through the heating wire.

[0010] In some embodiments, the spiral heating wire is nested with the first heat diffuser and sintered to connect them, so that both the inner and outer surfaces of the spiral heating wire are connected to the first heat diffuser.

[0011] In some embodiments, the first heat diffuser is sintered from a first heat diffuser material, wherein the first heat diffuser material is graphite or graphene.

[0012] In some embodiments, the first heat diffuser partially covers the heat generating element.

[0013] In some embodiments, a second heat diffuser is further included, and the second heat diffuser is provided with a plurality of through-going airflow channels, through which air can pass; wherein the second heat diffuser and the first heat diffuser completely cover the heating element and are connected as one body by sintering.

[0014] In some embodiments, the second heat spreader includes graphite or ceramic.

[0015] An embodiment of the present application further provides a method for preparing a heating module, comprising:

[0016] Providing a heating element, and performing insulation treatment on the surface of the heating element;

[0017] Providing a first heat diffuser material, and covering at least a portion of the surface of the insulated heating element with the first heat diffuser material;

[0018] The insulated heating element and the first heat diffuser material are sintered together to integrally connect the first heat diffuser and the heating element.

[0019] In some embodiments, the heating element includes a heating wire in a spiral coil shape, and the spiral heating wire has a cylindrical cavity; the method further includes: providing a first heat diffuser material, and filling the first heat diffuser material in the cavity.

[0020] In some embodiments, it also includes:

[0021] The first heat diffuser is machined to form a plurality of air flow channels.

[0022] In some embodiments, a first heat diffuser material is provided, the first heat diffuser material is covered on at least a portion of the surface of the insulated heating element, and the insulated heating element and the first heat diffuser material are sintered together to integrally connect the first heat diffuser and the heating element, including:

[0023] providing a second heat spreader;

[0024] The first heat diffuser material is disposed between the second heat diffuser and the heating element, and covers at least a portion of the surface of the insulated heating element;

[0025] The insulated heating element, the first heat diffuser material and the second heat diffuser are sintered together to integrally connect the first heat diffuser, the second heat diffuser and the heating element.

[0026] In some embodiments, a second heat spreader material is provided and sintered to form a second heat spreader.

[0027] In some embodiments, the second heat spreader is machined to form a plurality of air flow channels and a hollow cavity.

[0028] In some embodiments, the cavity is a through hole, or the cavity is a groove.

[0029] In some embodiments, the sintering temperature is 900-1100°C.

[0030] In some embodiments, the first heat diffuser material includes graphite or graphene, and the second heat diffuser material includes graphite or ceramic.

[0031] One embodiment of the present application also provides an aerosol generating device, including an aerosol generating product and a heating module, wherein the heating module can heat the aerosol generating product to generate an aerosol.

[0032] The heating module, corresponding preparation method and aerosol generating device provided by the present application, the first heat diffuser covers at least a portion of the surface of the heating element, and the two are sintered into one, so that there is heat conduction between the first heat diffuser and the heating element, thereby ensuring sufficient contact between the heating element and the first heat diffuser, high thermal conductivity efficiency, and high structural reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0034] Figure 1 is a schematic diagram of a heating module provided by an embodiment;

[0035] Figure 2 is a schematic diagram of a heating module provided by an embodiment;

[0036] Figure 3 is a schematic diagram of a heating module provided by an embodiment;

[0037] Figure 4 is a schematic diagram of a method for preparing a heating module provided by an embodiment;

[0038] In the figure: 10, heating module; 1, heating element; 21, first heat diffuser; 22, second heat diffuser; 3, insulating layer; 41, first conductive pin; 42, first conductive pin; 5, air flow channel. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] like Figure 1-3 As shown, an embodiment of the present application provides a heating module 10 including a heating element 1, which is configured to generate resistive Joule heat by passing an electric current, or to be induced in a changing magnetic field to form eddy current heating; a first heat diffuser 21, which covers and is integrally connected to at least a portion of the surface of the heating element 1 by sintering.

[0042] In the heating module 10 provided in the present application, the first heat diffuser 21 covers and is integrally connected to at least a portion of the surface of the heating element 1 by sintering, so that the insulated heating element 1 and the first heat diffuser 21 are in full contact, have good thermal conductivity, and have high structural reliability.

[0043] In one embodiment of the present application, an insulating layer 3 is provided on the surface of the heating element 1, and the insulating layer 3 is provided between the first heat diffuser 21 and the heating element 1, so that there is thermal conduction but no electrical connection between the first heat diffuser 21 and the heating element 1.

[0044] In one embodiment of the present application, the heating element 1 adopts resistance heating, and the material of the heating element 1 adopts a metal material, metal alloy, graphite, conductive ceramic or other ceramic material and metal material composite material with appropriate impedance. Among them, the appropriate metal or alloy material includes at least one of nickel, chromium, zirconium, titanium, nickel alloy, cobalt alloy, titanium alloy, nickel-chromium alloy, nickel-iron alloy, iron-chromium alloy, iron-chromium-aluminum alloy, titanium alloy, iron-manganese-aluminum-based alloy or stainless steel.

[0045] In one embodiment of the present application, the heating element 1 is a sensor, which is induced in a changing magnetic field to generate eddy current heat. The sensor can receive electromagnetic energy generated by the induction coil and convert the electromagnetic energy into heat. The sensor can also be a self-inductance coil, which converts electromagnetic energy into heat energy in the magnetic field generated by itself.

[0046] In one embodiment of the present application, in order to ensure the electrical safety of the heating element 1, the heating element 1 needs to be insulated. For example, an insulating layer 3 is provided and attached to the surface of the heating element, wherein the insulating layer 3 includes an insulating material such as glaze, glass or silica. For example, the insulating layer 3 also needs to have high-temperature stable performance, so that the insulated heating element 1 and the first heat diffuser 21 are sintered at high temperature, so that the heating element 1 and the first heat diffuser 21 are adhered together through the insulating layer 3.

[0047] In one embodiment of the present application, the material of the heating element 1 is a metal material with appropriate impedance, and the insulating layer 3 includes an oxide layer formed by a series of chemical treatments on the surface of the metal material. The heating element 1 and the first heat diffuser 21 are bonded together through the insulating oxide layer.

[0048] In one embodiment of the present application, the first heat diffuser 21 is sintered by a first heat diffuser material, and the first heat diffuser material is in contact with the heating element without leaving an air gap, so the first heat diffuser 21 sintered by the first heat diffuser material is in full contact with the heating element.

[0049] In one embodiment of the present application, the first heat diffuser 21 covers and is integrally connected to at least part of the surface of the heating element 1 by sintering, including the first heat diffuser 21 completely covering the surface of the heating element 1 and the first heat diffuser 21 partially covering the surface of the heating element 1. Complete coverage means that the surface of the heating element 1 is completely wrapped by the first heat diffuser 21, and partial coverage means that the surface of the heating element 1 is still exposed from the first heat diffuser 21 and is not completely covered by the first heat diffuser 21.

[0050] In some embodiments, the first heat diffuser 21 completely covers the heating element 1. That is, the first heat diffuser 21 completely covers the surface of the insulating layer 3, so that the heat generated by the heating element 1 can be transferred to the first heat diffuser 21 from any direction, and the heat transfer efficiency between the first heat diffuser 21 and the heating element 1 is high.

[0051] In one embodiment of the present application, the first heat diffuser 21 partially covers the heating element 1. That is, the first heat diffuser 21 partially covers the surface of the insulating layer 3, so that the heat generated by the heating element 1 can be conducted to the first heat diffuser 21 along a partial direction.

[0052] In some embodiments, the first heat diffuser 21 is provided with a plurality of through airflow channels 5 in an area away from the heating element 1, and the airflow channels 5 can allow air to pass through. The airflow channels 5 are provided in an area away from the heating element 1 of the first heat diffuser 21, so that the airflow channels 5 are not restricted by the position of the heating element 1 during the machining process, and the shape and size of the airflow channels 5 have more optional space.

[0053] In some embodiments, the number of the airflow channels 5 is multiple, and the multiple airflow channels 5 are evenly distributed along the circumferential direction or radial direction of the heating element. Figure 2 As shown, the air flow channels 5 are evenly distributed along the radial direction.

[0054] In one embodiment of the present application, the first heat diffuser 21 is sintered by a first heat diffuser material, wherein the first heat diffuser material is graphite or graphene. Both graphite and graphene have good thermal conductivity, and the first graphite body and the first graphene body formed by sintering graphite and graphene are in firm contact with the insulated heating element 1, have high structural reliability, and good thermal conductivity.

[0055] In one embodiment of the present application, the first heat diffuser 21 is a first graphite body, and the first graphite body completely covers the heating element 1 .

[0056] In one embodiment of the present application, the first heat diffuser 21 is a first graphite body, and the first graphite body partially covers the heating element.

[0057] In one embodiment of the present application, the first heat diffuser 21 is a first graphene body, and the first graphene body completely covers the heat generating body.

[0058] In one embodiment of the present application, the first heat diffuser 21 is a first graphene body, and the first graphene body partially covers the heat generating body.

[0059] In one embodiment of the present application, the first heat diffuser 21 has a through air flow channel 5 , and the air flow channel 5 can allow air to pass through.

[0060] In one embodiment of the present application, the first heat diffuser 21 may also be in a column shape, which may include a prism and a cylinder.

[0061] In one embodiment of the present application, the first heat diffuser 21 is cylindrical, the air flow channel 5 is also cylindrical, the air flow channel 5 extends along the axial direction of the first heat diffuser 21, and multiple air flow channels 5 are equidistantly distributed along the radial direction of the first heat diffuser 21.

[0062] In one embodiment of the present application, the first heat diffuser 21 partially covers the heating element 1, and the heating module 10 further includes a second heat diffuser 22. The second heat diffuser 22 and at least part of the surface of the heating element 1 are covered with the first heat diffuser material. The three are sintered and connected as one. After sintering, in the radial direction, the second heat diffuser 22, the first heat diffuser 21 and the heating element 1 are nested in sequence from the outside to the inside. The second heat diffuser 22 can be pre-set with a plurality of through airflow channels 5, and the airflow channels 5 can be passed through by air. The heat generated by the heating element 1 is conducted to the airflow channels 5 through the first heat diffuser 21 and the second heat diffuser 22, and the air in the airflow channels 5 is heated. Of course, the second heat diffuser 22 can also be machined into a plurality of through airflow channels 5 after sintering.

[0063] In some embodiments, the second heat spreader 22 includes a second graphite body or a second ceramic body.

[0064] In one embodiment of the present application, the second graphite body may be formed by sintering graphite powder, or may be formed by winding and sintering a graphite sheet.

[0065] In one embodiment of the present application, the second ceramic body includes ceramics with good thermal conductivity, so as to conduct the heat of the heating element 1 to the air in the air flow channel.

[0066] In one embodiment of the present application, the first heat diffuser 21 and the second heat diffuser 22 completely cover the insulating layer 3, the second heat diffuser 22 has a through airflow channel 5, the second heat diffuser 22 is a second graphite body or a second ceramic body, and the first heat diffuser 21 is a first graphite body or a first graphene body. The first heat diffuser 21 and the second heat diffuser 22 completely cover the insulating layer 3, which means that after the first heat diffuser 21 and the second heat diffuser 22 cover the heating element 1, there will be no air gap between the heating element 1 and the second heat diffuser 22, and there will be no air gap that affects the heating element 1 to conduct heat to the airflow channel 5 of the second heat diffuser 22.

[0067] In one embodiment of the present application, the heating module 10 further includes a first conductive pin 41 and a second conductive pin 42, which are respectively connected to the heating element 1. The first conductive pin 41 and the second conductive pin 42 are made of a material with a low resistance temperature coefficient.

[0068] In one embodiment of the present application, the first conductive pin 41 and the second conductive pin 42 are respectively made of two different materials of a thermocouple material such as nickel, nickel-chromium alloy, nickel-silicon alloy, nickel-chromium-copper, constanton bronze, iron-chromium alloy, etc. A thermocouple that can be used to detect the temperature of the heating element 1 is formed between the first conductive pin 41 and the second conductive pin 42, thereby obtaining the temperature of the heating element 1.

[0069] In one embodiment of the present application, the heating element 1 includes a heating wire in the shape of a spiral coil. The surface of the spiral heating wire is covered with an insulating material 3, and the first heat diffuser 21 completely covers the insulated heating element 1. The surface of the insulated spiral coil heating wire is covered with the first heat diffuser 21. The insulated spiral coil heating wire and the first heat diffuser 21 are in full contact, and the structural reliability is high. The first heat diffuser 21 has good thermal conductivity and can conduct the heat generated by the spiral coil heating wire to heat the air in the air flow channel 5.

[0070] In one embodiment of the present application, a cylindrical cavity is provided in the middle of the spiral coil-shaped heating wire, and the cylindrical cavity is filled with a first heat diffuser material.

[0071] In one embodiment of the present application, a cylindrical cavity is provided in the middle of the spiral coil-shaped heating wire, and a first heat diffuser material is distributed both inside and outside the cylindrical cavity.

[0072] In one embodiment of the present application, the first heat diffuser 21 and the second heat diffuser 22 completely cover the surface of the heating wire, the surface of the insulated spiral coil-shaped heating wire is covered with the first heat diffuser 21 and the second heat diffuser 22, the heating wire and the first heat diffuser 21 and the second heat diffuser 22 are in full contact with each other, the structural reliability is high, the first heat diffuser 21 and the second heat diffuser 22 have good thermal conductivity, and can conduct the heat generated by the spiral coil-shaped heating wire to the air in the airflow channel 5.

[0073] An embodiment of the present application also provides a method for preparing a heating module, such as Figure 4 As shown, including:

[0074] Providing a heating element 1;

[0075] Providing a first heat diffuser material, and covering the first heat diffuser material on at least a portion of the surface of the heating element 1;

[0076] The heat generating body 1 and the first heat diffusion material are sintered together, so that the first heat diffusion body 21 is integrally connected to the heat generating body 1 .

[0077] In order to make the insulated heating element 1 and the first heat diffuser 21 in close contact and have a good thermal conductivity, the present application directly sintered the insulated heating element 1 and the first heat diffuser material together, so that the insulated heating element 1 and the first heat diffuser 21 are in full contact, with high thermal conductivity and high structural reliability. In some embodiments, it also includes machining on the first heat diffuser 21 to form a plurality of airflow channels 5. The first heat diffuser 21 conducts the heat generated by the heating element 1 to the air in the airflow channel 5, so as to heat the air in the airflow channel 5 and then heat the aerosol generating product.

[0078] In some embodiments, it also includes:

[0079] Providing a second heat diffuser 22;

[0080] The first heat diffuser material is disposed between the second heat diffuser 22 and the heating element 1, and covers at least a portion of the surface of the insulated heating element 1;

[0081] The insulated heat generating body 1 , the first heat diffusion material and the second heat diffusion body 22 are sintered together, so that the first heat diffusion body 21 , the second heat diffusion body 22 and the heat generating body 1 are integrally connected.

[0082] In some embodiments, the insulated heating element 1, the first heat diffuser material and the second heat diffuser 22 are sintered together, and the first heat diffuser material can fill the gap between the second heat diffuser 22 and the heating element 1, and then high-temperature sintering is performed, so that the second heat diffuser 22 and the heating element 1 are in close contact through the first heat diffuser material, and there is no air gap, so that the second heat diffuser 22 and the heating element 1 have high structural reliability, good thermal conductivity, and high thermal conductivity efficiency.

[0083] In some embodiments, the second heat diffuser material is sintered to form the second heat diffuser 22. The second heat diffuser material can be a powder material or a sheet material wound together. After high temperature sintering, the second heat diffuser material forms a second heat diffuser 22 with a stable structure and good thermal conductivity.

[0084] In some embodiments, before sintering, the second heat diffuser 22 is pre-machined to form a plurality of airflow channels 5 and a hollow cavity. The heat of the heating element 1 is transferred to the air in the airflow channel 5 through the first heat diffuser 21 and the second heat diffuser 22 .

[0085] In some embodiments, the second thermal diffusion material is sintered at high temperature to form the second thermal diffusion body 22, the second thermal diffusion body 22 is machined to form the air flow channel 5 and the cavity, the heating element 1 is placed in the cavity, the first thermal diffusion material is provided, the first thermal diffusion material is covered on the heating element 1 in the cavity after the insulation is removed, and then high temperature sintering is performed, and the first thermal diffusion body 21, the second thermal diffusion body 22 are connected integrally with the heating element 1.

[0086] In some embodiments, a molded second heat diffuser 22 is provided, which is machined to form an air flow channel 5 and a cavity, the heating element 1 is placed in the cavity, a first heat diffuser material is provided, the first heat diffuser material is covered on the heating element 1 in the cavity after the insulation is removed, and then high-temperature sintering is performed, and the first heat diffuser 21, the second heat diffuser 22 and the heating element 1 are integrally connected.

[0087] In some embodiments, the sintering temperature is 900-1100°C.

[0088] In some embodiments, the sintering temperature is 1000°C.

[0089] In some embodiments, insulation treatment is also performed on the surface of the heating element 1 .

[0090] In some embodiments, the insulating treatment performed on the surface of the heating element 1 includes forming insulating materials such as glaze, glass or silicon dioxide. The insulating process can be performed by spraying, coating or the like.

[0091] The ingredients of glaze include silicon oxide, aluminum oxide, alkali metal oxides, etc. Among them, silicon dioxide is the most important ingredient, accounting for more than 50% of the weight of the entire glaze. In addition, trace amounts of metal oxides and other additives are added. The composition of glass is similar to that of glaze, mainly composed of silicon dioxide (SiO2) and alkali oxides (such as Na2O, K2O). Among them, silicon dioxide is the most important component in glass, accounting for more than 70%. In the process of making glass, additives such as pumice and dolomite are usually required to adjust its properties. Both glaze and glass need to be fired at high temperatures, and some additives also need to be added to adjust their characteristics. At medium and low temperatures, neither glaze nor glass can be formed, and this material can only be obtained at high temperatures. Glaze, glass and silicon dioxide all have good insulating properties.

[0092] In some embodiments, the insulation treatment on the surface of the heating element 1 includes forming an oxide layer. The insulation process can be an oxidation treatment of the metal surface. The oxidation treatment of the metal surface is the metal surface reacting with oxygen or an oxidant to form a protective oxide film to prevent metal corrosion. The metal surface oxidation treatment methods include thermal oxidation, alkaline oxidation, acid oxidation (ferrous metals), chemical oxidation, anodization (non-ferrous metals), etc.

[0093] The thermal oxidation method heats the metal product to 600℃~650℃, and then treats it with hot steam and reducing agent. Another method is to immerse the metal product in a molten alkali metal salt at about 300℃ for treatment. When the alkaline oxidation method is used, the parts are immersed in a prepared solution and heated to 135℃~155℃. The length of the treatment time depends on the carbon content in the parts. After the metal parts are oxidized, they are rinsed with 15g / L~20g / L soapy water at 60℃~80℃ for 2min~5min, and then rinsed with cold water and hot water respectively and blown or dried for 5min~10min (temperature is 80℃~90℃). The acid oxidation method is to place the parts in an acidic solution for treatment. The protective film generated on the metal surface after treatment has corrosion resistance and mechanical strength that exceed the performance of the film generated after alkaline oxidation treatment, so it is widely used. The chemical oxidation method is mainly suitable for the oxidation treatment of non-ferrous metals (such as aluminum, copper, magnesium and their alloys). The treatment method is to place the parts in a prepared solution, at a certain temperature, after a certain period of oxidation reaction, a protective film is formed, and then it can be washed and dried. Anodizing is another method of non-ferrous metal oxidation. It is a process of using metal parts as anodes and forming an oxide film on their surface by electrolysis. This oxide film can act as a passivation film between the metal and the coating, and can also increase the bonding strength between the coating and the metal, reduce the penetration of water, and thus extend the service life of the coating. It is widely used in the bottom layer of paint.

[0094] In some embodiments, the heating element 1 includes a heating wire in a spiral coil shape, the spiral heating wire has a cavity, a first heat diffuser material is provided, and the first heat diffuser material is filled in the cavity. The first heat diffuser material is sintered to form a first heat diffuser 21, and the first heat diffuser material and the heating wire are in close contact without leaving an air gap, so that there is no air gap between the first heat diffuser 21 formed by sintering and the heating element 1, so that the thermal conductivity between the first heat diffuser 21 and the heating element 1 is good.

[0095] In some embodiments, the second heat diffuser 22 is machined to form a plurality of air flow channels 5 and a hollow cavity, and the cavity is a through hole or a groove.

[0096] In one embodiment of the present application, the cavity of the second heat diffuser 22 may be a through hole, and the heating element 1 may be placed into the second heat diffuser 22 through the through hole. If the cavity is a through hole, the heating element 1 may be placed into the through hole from either end of the through hole.

[0097] In one embodiment of the present application, during the process of mechanically processing the second heat diffuser 22 to form a hollow cavity, the cavity of the second heat diffuser 22 may be a groove, and the heating element 1 may be placed in the second heat diffuser 22 through the groove.

[0098] In one embodiment of the present application, the heating element 1 includes a needle-shaped or sheet-shaped heating element, and the cavity of the second heat diffuser 22 is adapted to the shape of the needle-shaped or sheet-shaped heating element.

[0099] In some embodiments, the first heat diffuser material includes graphite or graphene, which is sintered to form a first graphite body or a first graphene body, and the second heat diffuser material includes graphite or ceramic, which is sintered to form a second graphite body or a second ceramic body.

[0100] In some embodiments, the first thermal diffuser material and the second thermal diffuser material are the same. For example, the first thermal diffuser material and the second thermal diffuser material are both graphite. The second thermal diffuser 22, i.e., the second graphite body, is sintered or machined to form a second thermal diffuser 22. The air flow channel 5 and the cavity are machined on the second graphite body. The heating element 1 is placed in the cavity, and then the first thermal diffuser material, i.e., the first graphite powder, is placed therein to form a first graphite body. The first graphite body, the second graphite body and the heating element 1 are integrally connected.

[0101] In some embodiments, the first thermal diffuser material and the second thermal diffuser material are different. For example, the first thermal diffuser material is graphene, and the second thermal diffuser material is graphite. The second thermal diffuser 22, i.e., the second graphite body, is sintered or machined to form a second thermal diffuser 22. The air flow channel 5 and the cavity are machined on the second graphite body. The heating element 1 is placed in the cavity, and then the first thermal diffuser material, i.e., graphene, is placed in the cavity to form a first graphene body. The first graphene body, the second graphite body and the heating element 1 are connected as one.

[0102] In some embodiments, the first thermal diffuser material and the second thermal diffuser material are different. For example, the second thermal diffuser 22 is a second ceramic body, and the first thermal diffuser material is graphite. The air flow channel 5 and the cavity are mechanically formed on the second ceramic body, and the heating element 1 is placed in the cavity, and then the first thermal diffuser material, i.e., graphite, is placed in the cavity to form a first graphite body. The first graphite body, the second ceramic body and the heating element 1 are connected as a whole.

[0103] In some embodiments, the first thermal diffuser material and the second thermal diffuser material are different. For example, the second thermal diffuser 22 is a second ceramic body, and the first thermal diffuser material is graphene. The air flow channel 5 and the cavity are mechanically formed on the second ceramic body, and the heating element 1 is placed in the cavity, and then the first thermal diffuser material, i.e., graphene, is placed therein to form a first graphene body. The first graphene body, the second ceramic body, and the heating element 1 are connected as a whole.

[0104] In one embodiment of the present application, in order to allow the heating element 1 to be placed in the second heat diffuser 22 , the inner diameter of the cavity is greater than the diameter of the heating element 1 .

[0105] Machining refers to the process of changing the size or performance of a workpiece through a mechanical device. According to the difference in processing methods, it can be divided into cutting processing and pressure processing.

[0106] In one embodiment of the present application, the heating element 1 is a spiral coil heating wire, which is a nickel-chromium alloy. The surface of the heating wire is coated with insulating glaze and sintered together with the first heat diffuser material. The heating wire, which is insulated after high-temperature sintering, is in close contact with the first heat diffuser 21, and has high structural reliability and high heat conduction efficiency.

[0107] One embodiment of the present application further provides an aerosol generating device, including an aerosol generating product and a heating module 10. The heating module 10 can heat the aerosol generating product to generate an aerosol.

[0108] In one embodiment of the present application, the heating element 1 transfers heat to the first heat diffuser 21 after being powered on and heated. The first heat diffuser 21 heats the air in the air flow channel 5. The heated air flows through the aerosol generating product, thereby causing the aerosol generating product to generate aerosol.

[0109] In one embodiment of the present application, after the heating element 1 is powered on and generates heat, the heat is transferred through the first heat diffuser 21 to the second heat diffuser 22. The second heat diffuser 22 heats the air in the air flow channel 5. The heated air flows through the aerosol generating product, thereby causing the aerosol generating product to generate aerosol.

[0110] In one embodiment of the present application, the aerosol-generating article is a liquid aerosol-generating substrate.

[0111] In one embodiment of the present application, the aerosol generating product includes an aerosol generating substrate, tobacco shreds and flavoring agents, etc. The aerosol generating substrate includes one or more of propylene glycol, glycerol, and diacetin. The tobacco shreds include one or more of traditional tobacco shreds, thick pulp tobacco sheets, roller-pressed tobacco sheets, and paper-making tobacco sheets. Flavoring agents include licorice, sucrose, fructose syrup, high fructose glucose syrup, cocoa powder, lavender, cinnamon, cardamom, celery, fenugreek, bitter fragrant skin, sandalwood, bergamot, geranium, honey essence, rose oil, vanilla, lemon oil, orange oil, mint oil, cinnamon, coriander, cognac, jasmine, chamomile, menthol, ylang-ylang, sage, spearmint, ginger, coriander or coffee, etc. The selection of tobacco shreds and flavoring agents can be determined according to the taste of the user.

[0112] In one embodiment of the present application, the aerosol-generating product is a heat-not-burn cigarette.

[0113] In one embodiment of the present application, the first heat diffuser 21 is surrounded by a metal shell, which conducts the heat of the first heat diffuser 21 to the aerosol generating product to supplement the heating of the aerosol generating product, so that the user can get a better user experience in the first few puffs.

[0114] In one embodiment of the present application, a metal shell surrounds the periphery of a mixture of the first heat diffuser 21 and the second heat diffuser 22. The metal shell conducts the heat of the mixture of the first heat diffuser 21 and the second heat diffuser 22 to the aerosol generating product, thereby supplementing the heating of the aerosol generating product. The user can obtain a better user experience in the first few puffs.

[0115] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but are not limited to the embodiments described in the specification. Furthermore, it is possible for a person of ordinary skill in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present application.

Claims

1. A heating module, characterized in that: include: A heating element configured to generate resistive Joule heating by passing an electric current, or to be induced in a changing magnetic field to generate eddy current heating; The first heat diffuser covers at least a portion of the surface of the heating element and is integrally connected to the heating element by sintering.

2. The heating module according to claim 1, characterized in that: An insulating layer is disposed on the surface of the heating element, and the insulating layer is disposed between the first heat diffuser and the heating element, so that there is thermal conduction but no electrical connection between the first heat diffuser and the heating element.

3. The heating module according to claim 1, characterized in that: The insulating layer includes an insulating material attached to the surface of the heating element, wherein the insulating material includes glaze, glass or silicon dioxide.

4. The heating module according to claim 1, characterized in that: The first heat diffuser completely covers the heat generating element.

5. The heating module according to claim 4, characterized in that: The first heat diffuser is provided with a plurality of through-going airflow channels in a region originally far away from the heating element, and the airflow channels are capable of allowing air to pass through.

6. The heating module according to claim 1, characterized in that: The heating element includes a heating wire in a spiral coil shape, and the heating wire generates resistance Joule heat when current passes through it.

7. The heating module according to claim 6, characterized in that: The spiral heating wire is nested with the first heat diffuser and sintered to connect them, so that both the inner and outer surfaces of the spiral heating wire are connected to the first heat diffuser.

8. The heating module according to claim 1, characterized in that: The first heat diffuser is formed by sintering a first heat diffuser material, wherein the first heat diffuser includes a first graphite body or a first graphene body.

9. The heating module according to claim 1, characterized in that: The first heat diffuser partially covers the heat generating element.

10. The heating module according to claim 9, characterized in that: Also included is a second heat diffuser, wherein the second heat diffuser is provided with a plurality of through-flow passages, wherein the air can pass through the air passages; The second heat diffuser and the first heat diffuser completely cover the heating element and are integrally connected by sintering.

11. The heating module according to claim 10, characterized in that: The second heat diffuser includes a second graphite body or a second ceramic body.

12. A method for preparing a heating module, characterized in that: include: Providing a heating element; Providing a first heat diffuser material, and covering at least a portion of the surface of the heating element with the first heat diffuser material; The heating element and the first heat diffuser material are sintered together to integrally connect the first heat diffuser with the heating element.

13. The method for preparing a heating module according to claim 12, characterized in that: include: The surface of the heating element is subjected to insulation treatment.

14. The method for preparing a heating module according to claim 12, wherein: The heating element includes a heating wire in a spiral coil shape, and the spiral heating wire has a cylindrical cavity; the method further includes: The first heat diffuser material is provided and filled in the cavity.

15. The method for preparing a heating module according to claim 12, characterized in that: Also includes: The first heat diffuser is machined to form a plurality of air flow channels.

16. The method for preparing a heating module according to claim 12, wherein: The method of providing a first heat diffuser material, covering at least a portion of the surface of the insulated heating element with the first heat diffuser material, and sintering the insulated heating element and the first heat diffuser material together to integrally connect the first heat diffuser and the heating element comprises: providing a second heat spreader; The first heat diffuser material is disposed between the second heat diffuser and the heating element, and covers at least a portion of the surface of the heating element after insulation; The insulated heating element, the first heat diffuser material and the second heat diffuser are sintered together to integrally connect the first heat diffuser, the second heat diffuser and the heating element.

17. The method for preparing a heating module according to claim 16, wherein: A second heat diffuser material is provided and sintered to form a second heat diffuser.

18. The method for preparing a heating module according to claim 17, characterized in that: The second heat diffuser is machined to form a plurality of air flow channels and a hollow cavity.

19. The method for preparing a heating module according to claim 18, characterized in that: The cavity is a through hole, or the cavity is a groove.

20. The method for preparing a heating module according to claim 12, characterized in that: The sintering temperature is 900-1100°C.

21. The method for preparing a heating module according to claim 12, wherein: The first heat diffuser material includes graphite or graphene, and the second heat diffuser material includes graphite or ceramic.

22. An aerosol generating device, comprising an aerosol generating article and a heating module according to claims 1-11, wherein the heating module can heat the aerosol generating article to generate an aerosol.

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