Heating element and aerosol generating device

Abstract

The utility model provides a heating piece and an aerosol generation device, and relates to the technical field of aerosol generation. The heating piece comprises a heating body and an electrode, the heating body comprises a main body made of a carbon nanofiber material, and a circuit pattern is etched on the surface of the heating body; the electrode extends out of the heating body, and the heating body is electrically connected with a power supply assembly through the electrode. According to the heating element provided by the invention, the heating body made of the carbon nanofibers is used for heating the aerosol generating substrate to form the aerosol, the structure is simple, the carbon nanofibers are resistant to high temperature, high in chemical stability and high in temperature rising speed, the temperature rising speed and the smoke generating effect can be effectively improved, and the reliability and the user experience feeling of the aerosol generating device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aerosol generation, in particular to a heating element and an aerosol generating device. BACKGROUND

[0002] The aerosol generating device contains an aerosol generating substrate, and aerosols are formed by heating treatment. These aerosols mix with air entering the aerosol generating device and flow out for a user to inhale.

[0003] In related technologies, the heating methods of the aerosol generating device mainly include carbon heating and electric heating. Carbon heating mainly uses the oxidation reaction of carbon itself to generate heat to provide energy for the aerosol generating substrate, causing loss of the carbon itself and risk of generating harmful components. The cigarette of the carbon heating non-combustion cigarette is similar to the ordinary cigarette. A high-purity carbon rod is arranged at the cigarette end. The carbon rod is ignited by a tool during smoking. Hot gas generated by the combustion of the carbon rod is used to heat the tobacco material behind to deliver the aroma of the tobacco to the smoker. However, since the hot gas after the combustion of the carbon is used to heat the tobacco, the gas after the combustion of the carbon is easily inhaled into the human body along with the smoke, thereby easily causing the human body to inhale more carbon monoxide, increasing the harm to the human body. Electric heating often uses metal heating films or heating wires, which consume limited noble metal resources and have the risk of metal ion overflow. At the same time, whether it is electric heating or carbon heating, there are problems such as low energy conversion rate, slow heating speed, low smoke amount, low utilization rate of tobacco material, and the smoking experience needs to be improved. CONTENT OF THE UTILITY MODEL

[0004] The technical problem solved by the present application is to provide a heating element to improve the smoking effect and reliability.

[0005] In some embodiments, a heating element is provided, including a heating body and an electrode, wherein the heating body includes a main body of carbon nanofiber material, and a circuit pattern is etched on the surface of the heating body; the electrode extends out of the heating body, and the electrode is used to establish an electrical connection between the heating body and a power supply component.

[0006] In some embodiments, the heating body is in a long strip shape, and the circuit pattern is distributed on the outer surface of the heating body.

[0007] In some embodiments, the long strip shape is in a needle shape or a sheet shape.

[0008] In some embodiments, the circuit pattern extends along the length direction of the heating body.

[0009] In some embodiments, the heating element further includes a protective layer, and the protective layer is arranged outside the heating body.

[0010] In some embodiments, the heat-generating body is a hollow cylindrical structure, and the circuit pattern is distributed on the outer surface and / or the inner surface of the cylindrical structure.

[0011] In some embodiments, the heating element further comprises a cylindrical protective layer, and the heat-generating body is sleeved outside the protective layer.

[0012] In some embodiments, the circuit pattern is in a straight line, a broken line, and / or a wavy shape.

[0013] In some embodiments, the carbon nanofiber has a diameter of 50nm-200nm and a length of 50-100pm.

[0014] In some embodiments, the protective layer is made of quartz or metal.

[0015] In some embodiments, an aerosol-generating device is provided, comprising the heating element described above.

[0016] In some embodiments, the aerosol-generating device comprises a containing cavity and a power supply assembly, the containing cavity is used to contain an aerosol-generating substrate; the heating element is built-in in the containing cavity, and is used to contact and heat the aerosol-generating substrate; the power supply assembly supplies power to the heating element through the electrode.

[0017] The heating element provided in the present application uses a heat-generating body made of carbon nanofiber to heat an aerosol-generating substrate to form an aerosol, compared with the resistance heating technology in the related art, the structure is simple, the carbon nanofiber is resistant to high temperature and has high chemical stability, the heating speed is fast, the heating rate and the smoking effect can be effectively improved, and the reliability and the user experience of the aerosol-generating device are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a structural schematic diagram of a heating element in an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of a heating element in another embodiment of the present application;

[0021] Figure 3 is a structural schematic diagram of a heating element in another embodiment of the present application;

[0022] Figure 4is a cross-sectional view of a heating element in an embodiment of the present application;

[0023] Figure 5 is a cross-sectional view of a heating element in another embodiment of the present application;

[0024] Figure 6 is a cross-sectional view of an aerosol-generating device in an embodiment of the present application;

[0025] Figure 7 is a cross-sectional view of an aerosol-generating device in another embodiment of the present application.

[0026] In the above-described drawings:

[0027] 10 - aerosol-generating device, 101 - smoking section, 1011 - accommodation cavity, 104 - power supply section, 1041 - air inlet cavity;

[0028] 11 - heating element, 111 - heating body, 1111 - first heating unit, 1112 - second heating unit, 1114 - first end, 1115 - second end, 112 - electrode, 113 - circuit pattern, 114 - protective layer, 115 - heat conductor;

[0029] 12 - isolating element, 14 - power supply assembly, 15 - housing. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings and embodiments. It is particularly pointed out that the following embodiments are only for illustrating the present application, but not for limiting the scope of the present application. Similarly, the following embodiments are only part of the embodiments of the present application, but not all the embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0031] The terms "first", "second", "third", etc. in the embodiments of the present application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. The terms "include" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or components inherent to the process, method, product or device.

[0032] Reference herein to "embodiments" means that a particular feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor does it necessarily refer to a separate or alternative embodiment. It is expressly understood that the embodiments described herein can be combined with other embodiments.

[0033] Heat-not-burn cigarettes are one of the important categories of new types of tobacco products, which generally pass the satisfaction and part of the tobacco flavor to consumers by heating the tobacco without burning, and have similar appearance and consumption mode to traditional cigarettes, and to some extent, meet the physiological needs and psychological needs of consumers. In some related technologies, heat-not-burn cigarettes generally use carbon heating and electric heating to perform low-temperature heating. These two heating methods generally have the problems of low energy conversion rate, slow heating speed, low smoke volume and low utilization rate of tobacco material in the actual smoking process, and the smoking experience needs to be improved.

[0034] Please refer to Figure 1 , Figure 1FIG. 1 is a schematic view of a heating element according to an embodiment of the present application. The heating element 11 according to an embodiment of the present application can be used in a heat-not-burn cigarette to improve the heating rate and the smoking effect. The heating element 11 includes a heating body 111 and an electrode 112. The heating body 111 includes a main body of carbon nanofiber material, and a circuit pattern 113 is etched on the surface of the heating body 111. The electrode 112 extends from the heating body 111, and the heating body 111 can be electrically connected to a power supply assembly through the electrode 112. The electrode 112 can be made of graphite or metal, and the metal can be nickel, copper, iron, aluminum, silver, or the like.

[0035] The carbon nanofiber (CNF) has high chemical stability and does not produce harmful substances at an extremely high temperature during heating of a cigarette. The carbon nanofiber is a high-temperature-resistant material and produces fewer harmful components than the carbon heating or resistance heating technology in the related art. In addition, since the carbon nanofiber is not used as a metal heating film or a heating wire, the limited noble metal resource is saved, and there is no metal ion overflow, which is safer. The heating element 11 made of the carbon nanofiber can withstand a high temperature of 800℃ or higher, has the advantages of safety and stability, high energy conversion rate, fast heating rate, high amount of smoke, high utilization rate of tobacco material, fastness, high efficiency, and low price, and has a faster heating rate.

[0036] It should be noted that the heating body 111 made of the carbon nanofiber is formed by stacking graphite sheets of nanometer size at different angles with respect to the axial direction of the carbon nanofiber in space, and has a unique fiber structure. Unlike the conventional heating sheet or heating wire, the carbon nanofiber generates heat by relying on a metal material. The carbon nanofiber is atomized, has a larger heating surface, is stable in operation, and has a long service life, and can effectively avoid the problems of burnt taste and difficulty in cleaning. Further, since the heating efficiency is high, the heating element 11 and the entire aerosol generating device 10 can be miniaturized. The carbon nanofiber has a simple processing technology and high manufacturing efficiency, which is conducive to reducing the cost. The diameter of the carbon nanofiber can be 50nm to 200nm, and the length distribution can be 50μm to 100μm. Alternatively, the diameter of the carbon nanofiber can be about 80nm to 160nm, and the length distribution can be about 60μm to 90μm.

[0037] The heating body 111 made of the carbon nanofiber can have different shapes. Please refer to FIG. 2. Figure 3 In some embodiments, the heating body 111 has a long strip shape, and the circuit pattern 113 is distributed on the outer surface of the heating body 111. For example, the heating body 111 can have a needle shape or a sheet shape. One end of the heating body 111 is a sharp end, and the shape of the sharp end can be a pyramid or a cone. The shape of the heating body 111 at the non-sharp end can be a cylinder or a prism, so that the heating body 111 can be easily inserted into an aerosol generating substrate.

[0038] Optionally, the circuit pattern 113 extends along the length direction of the heat generating body 111. Figure 1 The Z direction shown in the figure is the length direction of the heat generating body 111. The resistance of the heat generating body 111 can be changed by etching a pattern on the carbon nanofiber, so as to match the resistance with the power supply assembly, to generate heat by electrification. The circuit pattern can be in a straight line, a broken line and / or a wavy shape.

[0039] Please refer to Figure 2 , Figure 2 is a structural schematic diagram of a heating element in another embodiment of the present application. In some embodiments, the heating element 11 further comprises a protective layer 114, which is arranged outside the heat generating body 111. In an embodiment, the protective layer 114 is made of quartz or metal. The protective layer 114 slurry can be covered on the outer surface of the heat generating body by screen printing, steel screen printing or coating, and then sintered. The thickness of the protective layer 114 is 10-30 μm. Optionally, the thickness of the protective layer 114 can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, etc. On the one hand, by arranging the protective layer 114 outside the carbon nanofiber heat generating body 111, the heat conduction, heat convection and heat radiation between the heat generating body 111 and the protective layer 114 can be enhanced, and the heating efficiency can be improved. On the other hand, the protective layer 114 arranged outside the heat generating body 111 can protect the heat generating body 111, avoid the heat generating body 111 from being eroded and oxidized by the aerosol generating substrate, and damage the heating efficiency of the heat generating body 111, so that the heat is not uniform. At the same time, the protective layer 114 made of quartz or metal can improve the structural strength of the heating element 11, avoid the heat generating body 111 in the protective layer 114 from being deformed under stress, and thus cause the circuit pattern 113 on the surface of the heat generating body 111 to be unevenly distributed, resulting in uneven heating. By isolating the heat generating body 111 and the aerosol generating substrate through the protective layer 114, the aerosol generating substrate can also be prevented from being polluted by the oxidized heat generating body 111, the material composition of the aerosol generating substrate can be damaged, and the smell and taste of the aerosol generating substrate can be affected.

[0040] Please refer to Figure 3 , Figure 3 is a structural schematic diagram of a heating element in another embodiment of the present application. In some embodiments, the heat generating body 111 can have a hollow cylindrical structure, and the circuit pattern 113 is distributed on the outer surface and / or the inner surface of the heat generating body 111. It can be understood that the heat generating body 111 can only have the circuit pattern 113 etched on the inner surface thereof, or the heat generating body 111 can only have the circuit pattern 113 etched on the outer surface thereof, or the heat generating body 111 can have the circuit pattern 113 etched on both the inner surface and the outer surface thereof.

[0041] Optionally, the circuit pattern 113 can be arranged around the heat generating body 111 in the cylindrical structure. For example, the circuit pattern 113 is arranged along the length direction of the heat generating body 111. Figure 3The curve-shaped pattern is distributed equidistantly in the Z direction) with a curvature radius of 1-2.5 mm. In this way, the phenomenon of local overheating can be avoided, the heat concentration points of the heating body 111 are reduced when the heating body 111 generates heat, and the temperature difference between the aerosols is reduced, thereby reducing the phenomenon of condensate generated when the aerosols are mixed.

[0042] In this embodiment, the heating body 111 forms a cavity for accommodating the aerosol generating substrate, and the heating element 11 further comprises a protective layer 114 in a cylindrical shape, and the heating body 111 is sleeved outside the protective layer 114. That is, the protective layer 114 covers the inner surface of the heating body 111, can isolate the contact surface of the heating body 111 in contact with the aerosol generating substrate, avoid the erosion and oxidation of the heating body 111 by the aerosol generating substrate, and damage the heating efficiency of the heating body 111, so that the heating is uneven. At the same time, avoid the pollution of the heating body 111 to the aerosol generating substrate, damage its material composition, and affect the smell and taste of the aerosol generating substrate.

[0043] Please refer to Figure 4 , Figure 4 is a cross-sectional view of the heating element in an embodiment of the present application. Optionally, the heating body 111 comprises a first heating unit 1111 and a second heating unit 1112 accommodated in the first heating unit 1111, the first heating unit 1111 is a hollow cylindrical structure, and the second heating unit 1112 is a solid strip-shaped structure. The inner surface and / or the outer surface of the first heating unit 1111 is etched with a circuit pattern 113, and the outer surface of the second heating unit 1112 is etched with a circuit pattern 113. It can be understood that the present embodiment combines the foregoing heating body 111 in a solid strip-shaped structure and the heating body 111 in a hollow cylindrical structure, so that the aerosol generating substrate is in contact with the first heating unit 1111 and the second heating unit 1112 at the same time, the contact area between the aerosol generating substrate and the heating body 111 is increased, so that the aerosol generating substrate is heated more uniformly, a large amount of aerosol can be generated quickly under the heating of the heating element 11, and the smoking demand of the user can be met.

[0044] Please refer to Figure 5 , Figure 5is a cross-sectional view of a heating element in another embodiment of the present application. In some embodiments, the heating element 11 further comprises a heat conductor 115 made of porous ceramic. For example, the heat conductor 115 is a long strip structure, the heating element 111 made of carbon nanofiber is coated or attached to the outer surface of the heat conductor 115 to form a coating film, and the outer surface of the heating element 111 is etched with a circuit pattern 113. In order to ensure good thermal conductivity and rigidity of the porous ceramic, the thickness of the porous ceramic can be about 5-25 mm, and more preferably about 10-20 mm. The material of the porous ceramic can use aluminum nitride, silicon nitride or aluminum oxide, etc. Among them, from the aspect of good thermal conductivity, aluminum nitride is preferred, and from the aspect of higher rigidity, silicon nitride and aluminum oxide are preferred. The thickness of the heating element 111 made of carbon nanofiber is 1-2 mm. The heating element 111 made of carbon nanofiber can quickly heat the aerosol generating substrate, and both the heating element 111 made of carbon nanofiber and the heat conductor 115 made of porous ceramic have high porosity, which can produce capillary action to prevent the aerosol generating substrate from producing a paste taste.

[0045] In some embodiments, for the various shape structures of the heating element 111 and the circuit pattern 113 described in the foregoing, it can be understood that the etching depth and the etching width of the circuit pattern 113 on the heating element 111 can be calculated and designed according to the input power of the power supply. The heating element 111 comprises a first end 1114 and a second end 1115 arranged at intervals along the length direction of the heating element 111, and the first end 1114 is the end close to the power supply assembly 14.

[0046] Please refer back to Figure 1 , in combination with the embodiment in which the heating element 111 is a needle-shaped long strip structure and the circuit pattern 113 extends along the length direction of the heating element 111. Alternatively, the etching width of the circuit pattern 113 gradually widens from the first end 1114 to the second end 1115. The width is the distance extending along the circumferential direction of the heating element 111.

[0047] Alternatively, the etching depth of the circuit pattern 113 gradually deepens from the first end 1114 to the second end 1115. The depth is the distance extending along the radial direction of the heating element 111.

[0048] Alternatively, the etching width of the circuit pattern 113 gradually widens from the first end 1114 to the second end 1115 and the etching depth of the circuit pattern 113 gradually deepens from the first end 1114 to the second end 1115.

[0049] It can be understood that, by setting the etching width of the circuit pattern 113 to gradually widen from the first end 1114 to the second end 1115, and / or the etching depth of the circuit pattern 113 to gradually deepen from the first end 1114 to the second end 1115, the heating body 111 can have a greater resistance and generate more heat at the second end 1115, and the heat can be better transferred to the second end 1115 of the heating body 111, so that the generated aerosol is sufficiently heated when passing through the first end 1114 and the second end 1115 in turn. The smaller resistance of the first end 1114 prevents the temperature of the first end 1114 from being too high, thereby avoiding adverse effects on other structures of the aerosol generating device 10, such as the power supply assembly 14. The design of the circuit pattern 113 with different widths and / or depths allows the heat generation to be adapted to the direction of the aerosol outflow, so that the aerosol generating substrate is more completely heated, the circuit is protected, and the heating stability and the service life of the heating element 11 are improved.

[0050] Referring to Figure 6 , Figure 6 is a schematic cross-sectional view of an aerosol generating device according to an embodiment of the present disclosure. The embodiments of the present disclosure also provide an aerosol generating device 10, which includes a receiving cavity 1011, a power supply assembly 14, and any of the heating elements 11 described in the above embodiments. The receiving cavity 1011 is configured to receive an aerosol generating substrate. The heating element 11 is configured to contact and heat the aerosol generating substrate to form an aerosol. The power supply assembly 14 is electrically connected to the heating element 11 via the electrode 112, and is configured to supply the heating element 11 with electrical energy during operation.

[0051] The aerosol generating device 10 further includes a housing 15, which can have a cylindrical, prismatic, or ellipsoidal shape, and can be made of a heat-insulating material. The housing 15 defines the receiving cavity 1011. The aerosol generating substrate in the receiving cavity 1011 can be a solid substrate, which can have a rod, particle, filament, or sheet shape. The aerosol generating substrate can also be a liquid substrate. Due to the unique fiber structure of the carbon nanofiber, the liquid substrate can be uniformly infiltrated into the heating body 111 and vaporized into an aerosol under the action of the heating body 111, by virtue of the surface tension and capillary action.

[0052] The aerosol-generating device 10 comprises a smoking section 101, one end of the smoking section 101 is provided with a power supply section 104, a containing cavity 1011 is arranged in the smoking section 101, the power supply section 104 is provided with an air inlet cavity 1041, the air inlet cavity 1041 is communicated with the containing cavity 1011 of the smoking section 101, and the power supply assembly 14 is arranged in the air inlet cavity 1041. The isolation piece 12 is arranged between the smoking section 101 and the power supply section 104, the electrode hole is arranged on the isolation piece 12, the electrode 112 of the heating piece 11 is inserted into the electrode hole, and the heating body 111 is electrically connected with the power supply assembly 14 through the electrode 112.

[0053] Please refer to Figure 7 , Figure 7 is a cross-sectional view of the aerosol-generating device in another embodiment of the present application. It should be noted that in the embodiment in which the heating body 111 is a hollow cylindrical structure and the outer surface of the heating body 111 is etched with a circuit pattern 113. The gap is formed between the heating body 111 and the side wall of the containing cavity 1011, so as to facilitate the circulation of air, carry away the heat between the heating body 111 and the side wall of the containing cavity 1011, and avoid the surface temperature of the aerosol-generating device 10 being too high to affect the use of the user when working.

[0054] The heating piece 11 provided by the present application uses the heating body 111 made of carbon nanofiber to heat the aerosol-generating substrate to form aerosol. The carbon nanofiber has the advantages of high temperature resistance and high chemical stability. Compared with the resistance heating technology in the related art, the heating is more uniform and the heating speed is faster, which can effectively improve the heating speed and the smoking effect, and is beneficial to improve the reliability and user experience of the aerosol-generating device 10. At the same time, the structure of the aerosol-generating device 10 is simple, the manufacturing process is simplified, which is beneficial to improve the manufacturing efficiency and reduce the production cost.

[0055] The above only describes some embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent device or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A heating element, characterized by The heating element comprises: a heating body comprising a carbon nanofiber material, a circuit pattern being etched on a surface of the heating body; an electrode extending from the heating body, the electrode being configured to electrically connect the heating body with a power supply assembly.

2. The heating element according to claim 1, characterized in that The heating body has an elongated structure, and the circuit pattern is distributed on an outer surface of the heating body.

3. The heating element according to claim 2, characterized in that The elongated structure has a needle shape or a sheet shape. The circuit pattern extends along a length direction of the heating body.

4. The heating element according to claim 2, characterized in that The heating element further comprises a protective layer, the protective layer being arranged outside the heating body.

5. The heating element of claim 1, wherein The heating body has a hollow cylindrical structure, and the circuit pattern is distributed on an outer surface and / or an inner surface of the cylindrical structure.

6. The heating element according to claim 5, characterized in that The heating element further comprises a protective layer having a cylindrical shape, and the heating body is arranged outside the protective layer.

7. The heating element according to claim 2 or 5, characterized in that The circuit pattern has a straight line shape, a zigzag shape, and / or a wave shape. The carbon nanofiber has a diameter of 50-200 nm and a length of 50-100 μm.

8. The heating element according to claim 4 or 6, characterized in that The protective layer is made of quartz or metal.

9. An aerosol-generating device comprising: The heating element according to any one of claims 1-8.

10. The aerosol-generating device of claim 9, wherein, The heating element further comprises a receiving cavity and a power supply assembly, wherein: the receiving cavity is configured to receive an aerosol generating substrate; the heating element is arranged in the receiving cavity and configured to contact and heat the aerosol generating substrate; the power supply assembly is configured to supply power to the heating element through the electrode.

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