CN211861814U

CN211861814U - Electrical heating element and aerosol-generating device

Info

Publication number: CN211861814U
Application number: CN202020140098.1U
Authority: CN
Inventors: 陈斌; 彭亮; 李鹏飞
Original assignee: Shenzhen Royal Tobacco Industrial Ltd
Current assignee: Shenzhen Royal Tobacco Industrial Ltd; Shenzhen Yuyan Industrial Ltd
Priority date: 2020-01-21
Filing date: 2020-01-21
Publication date: 2020-11-06
Anticipated expiration: 2030-01-21

Abstract

The utility model relates to an electric heating element and aerosol generate device, this electric heating element include the main part, be provided with in the main part and produce thermal at least a conducting path by mains operated, a serial communication port, the resistance layer that contains resistive material is covered on the surface of main part. The utility model discloses an electric heating element is through at the main part peripheral hardware resistance layer, utilizes the resistance layer can generate goods full coverage contact and the fast nature of thermal conductance with the aerosol, realizes that electric heating element evenly heats the aerosol fast comprehensively and generates goods, improves the taste effect.

Description

Electrical heating element and aerosol-generating device

Technical Field

The utility model relates to an electric heating element and aerosol generate device.

Background

The traditional cigarette needs to be ignited and combusted by open fire to generate tobacco smoke, and thousands of mixed substances harmful to human bodies can be released by tobacco in the high-temperature and cracking processes. And the low-temperature heating smoking set can effectively reduce the generation of harmful substances and is healthier. When the low-temperature cigarette is used, a cigarette body is inserted into a heating pipe of a smoking set or a heating sheet is inserted into the cigarette body, then a power supply is electrified to enable the heating pipe/the heating sheet to generate heat, and the cigarette body is heated to generate smoke.

The low temperature among the prior art heats and does not burn the electrically conductive orbit of design on the electric heating element that the smoking set used so that the resistance is bigger, can make the electric current little in the ohmic heating process to the power saving, but this kind of electrically conductive orbit appears local overheat easily, especially during initial heating, leads to the cigarette body to heat inhomogeneous, the taste is not good enough.

SUMMERY OF THE UTILITY MODEL

In view of this, there is a need for an electrical heating element and an aerosol-generating device.

An electrical heating element for heating an aerosol-generating article, the heating element comprising a body having at least one electrically conductive pathway arranged thereon for generating heat from a power supply, the body having a surface coated with a resistive layer comprising a resistive material.

In a preferred embodiment, the resistive layer covers at least the region of the body in contact with the aerosol-generating article.

In a preferred embodiment, the resistive layer is a layer structure extending continuously along the outer circumference of the body.

In a preferred embodiment, the resistive layer has a temperature coefficient of resistance characteristic such that the resistive layer functions as a temperature sensor for the electric heating element.

In a preferred embodiment, the resistive layer senses the temperature of the electric heating element based on the temperature coefficient of resistance characteristic, and the power supply supplies power to at least one of the conductive paths depending on the sensed temperature of the resistive layer and a desired temperature.

In a preferred embodiment, the resistive material comprises one or more of a ceramic-doped semiconductor, a conductive ceramic, carbon, graphite, graphene, a metal alloy, a composite of a doped ceramic and a metal.

In a preferred embodiment, at least one of the electrically conductive paths is formed on the surface of the main body, at least the surface of the electrically conductive path is covered with an insulating and heat conducting layer made of insulating and heat conducting material, and the resistive layer is further covered on the surface of the insulating and heat conducting layer.

In a preferred embodiment, at least one of the electrically conductive vias is formed in the body, and the body is made of an insulating and thermally conductive material.

In a preferred embodiment, each of the conductive paths is at least one of a line, a wire, a trace and a print formed on the main body by a conductive material.

In a preferred embodiment, the conductive material comprises one or more of silver, platinum, copper, nickel and palladium.

In a preferred example, the insulating and heat conducting material comprises one or more of glass, ceramic, anodized metal and polyimide.

In a preferred embodiment, the surface of the resistive layer is further covered with a passivation layer.

In a preferred embodiment, the passivation layer is made of one or more of gold, nickel and glass.

The utility model also provides an aerosol generating device, include:

at least one electrical heating element as described above for heating an aerosol-generating article to produce an aerosol;

a power source for supplying power to the at least one power-on circuit on the at least one electric heating element.

The utility model also provides a preparation method of foretell electric heating element, include: forming a main body, forming at least one conductive path on the main body, wherein the conductive path is powered by a power supply to generate heat, and forming a resistance layer containing a resistance material on the surface of the main body.

The utility model discloses electric heating element is through at the main part peripheral hardware resistance layer, utilizes the resistance layer can generate goods full coverage contact and the fast nature of thermal conductance with the aerosol, realizes that electric heating element evenly heats the aerosol fast and comprehensively and generates goods, improves the taste effect.

Drawings

Fig. 1 is a schematic external view of an electric heating element according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an electric heating element according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

In the present invention, when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present, unless specifically defined as being "directly on. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, unless expressly stated otherwise. In contrast, when an element is referred to as being "directly connected" or "directly secured," there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only. The various objects of the drawings are drawn to scale for ease of illustration and not to scale for actual components.

An "aerosol-generating device" as described in embodiments of the present invention refers to a device, such as a smoking article, for providing thermal or electrical energy to an aerosol-generating article. The aerosol-generating device may provide thermal energy directly to heat the aerosol-generating article or, preferably, to provide electrical energy to an aerosol-generating article which converts the electrical energy to thermal energy to heat the smoking material.

An "aerosol-generating article" as defined in embodiments of the present invention refers to a product, such as an aerosol-generating article, cartridge or cigarette, preferably a disposable article, containing a smoking material and capable of generating an aerosol, such as smoke or a mist, by heating. The aerosol-generating article is not capable of providing electrical energy by itself.

The embodiment of the utility model provides a "tobacco material" refers to the fuming substance, can produce the material of smell and/or nicotine and/or flue gas through heating or burning, can be by the material of atomizing, aerosol generating material promptly. The tobacco material can be solid, semi-solid and liquid. Solid tobacco materials are often processed into sheet-like products due to considerations such as breathability, assembly, and manufacture, and are also commonly referred to as sheet, and filamentary sheet is also referred to as sheet filament. The tobacco material discussed in the embodiments of the present invention may be natural or synthetic tobacco liquid, tobacco oil, tobacco glue, tobacco paste, tobacco shred, tobacco leaf, etc., for example, the synthetic tobacco material contains glycerin, propylene glycol, nicotine, etc. The tobacco liquid is liquid, the tobacco tar is oily, the tobacco gel is gelatinous, the tobacco paste is pasty, the tobacco shreds comprise natural or artificial or extracted tobacco shreds, and the tobacco leaves comprise natural or artificial or extracted tobacco leaves. The smoking material may be heated in the form of an enclosure with other materials, such as in a heat-degradable package, for example a microcapsule, from which the desired volatile material is derived after heating.

The embodiment of the utility model provides a tobacco material can contain nicotine, also can not contain nicotine. The tobacco material containing nicotine may include at least one of natural tobacco leaf product, tobacco liquid, tobacco oil, tobacco glue, tobacco paste, tobacco shred, tobacco leaf, etc. prepared from nicotine. The tobacco liquid is in water state, the tobacco tar is in oil state, the tobacco gum is in gel state, the tobacco paste is in paste state, the tobacco shred comprises natural or artificial or extracted tobacco shred, and the tobacco leaf comprises natural or artificial or extracted tobacco leaf. The nicotine-free tobacco material mainly contains fragrant substances, such as spices, and can be atomized to simulate smoking process and quit smoking. In one embodiment, the flavoring comprises peppermint oil. The smoking material may also include other additives such as glycerin and/or propylene glycol.

Referring to fig. 1-2, an aerosol-generating device is provided, comprising at least one electrical heating element for heating an aerosol-generating article to generate an aerosol, the electrical heating element comprising a main body 1, at least one conductive path 2 for generating heat from a power supply provided on the main body 1, and a resistive layer 4 comprising a resistive material coated on a surface of the main body 1. The aerosol-generating device further comprises a power supply for supplying power to the at least one electrically conductive pathway 2 on the at least one electric heating element.

The body 1 is rigid, and the body 1 may be a sheet-like or rod-like body 1 inserted into the aerosol-generating article, in which case the resistive layer 4 is provided on the outer wall surface of the body 1. In other embodiments, the body 1 may also be a tubular body 1 that covers the outer circumference of the aerosol-generating article, in which case the resistive layer 4 covers the inner wall surface of the body 1.

In some embodiments, the at least one electrically conductive pathway 2 is formed on a surface of the body 1, where the surface of the body 1 refers to a surface for heating the aerosol-generating article, which may be an internal or external surface. When the conductive path 2 is formed on the surface of the main body 1, at least the surface of the conductive path 2 is covered with an insulating and heat conducting layer 3 made of insulating and heat conducting material, and the resistance layer 4 is also covered on the surface of the insulating and heat conducting layer 3. The purpose of the insulating and heat conducting layer 3 is to avoid short circuit between the resistance layer 4 and the conductive path 2, and the insulating and heat conducting material includes one or more of paper, glass, ceramic, anodized metal and polyimide. The insulating and heat conducting layer 3 may be only covered on the area of the conductive path 2, or may be completely covered on the surface of the main body 1, the conductive path 2 is located between the surface of the main body 1 and the insulating and heat conducting layer 3, and the resistance layer 4 is covered on the insulating and heat conducting layer 3. Wherein the body 1 is rigid, and the body 1 is made of one or more of glass, ceramic, anodized metal, coated metal, and polyimide. The ceramic may include mica, alumina (Al2O3), zirconia (ZrO2), or the like.

In other embodiments, at least one conductive path 2 is formed in the main body 1, that is, the conductive path 2 is embedded in the structure of the main body 1, and the main body 1 is made of insulating and heat conductive material, wherein the insulating and heat conductive material includes one or more of glass, ceramic, anodized metal, coated metal and polyimide. The ceramic may include mica, alumina (Al2O3), zirconia (ZrO2), or the like.

Each of the conductive paths 2 is a pattern formed on the main body 1 by a conductive material, and may be a line of any pattern, which is not limited herein. The conductive path 2 may be a line, a wire, a print, a trace, etc. made of a conductive material. Conductive materials include, but are not limited to: semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, metal alloys, and composites made of ceramic and metallic materials. The composite material may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, alloys containing nickel, cobalt, chromium, aluminum, titanium, zirconium, hafnium, niobium, molybdenum, tantalum, tungsten, tin, gallium, manganese, and iron, and superalloys based on nickel, iron, cobalt, stainless steel, and iron-manganese-aluminum based alloys. The conductive material preferably comprises one or more of silver, platinum, copper, nickel and palladium.

Wherein the resistive layer 4 covers at least the area of the body 1 in contact with the aerosol-generating article. That is, the main body 1 is inserted into a portion of the aerosol-generating product, and the entire outer periphery of the portion is covered with the resistance layer 4, or the main body 1 is covered with a portion of the aerosol-generating product, and the entire inner wall of the portion is covered with the resistance layer 4.

The resistive layer 4 preferably has a continuous layer structure, i.e., the resistive layer 4 is a layer structure extending continuously along the outer circumference of the body 1, i.e., a continuous surface is formed, i.e., the resistive layer 4 is a layer structure extending continuously along the starting position of the body 1 and winding around to the starting position. In other embodiments, the resistive layer 4 may also include a plurality of cells arranged, in which case each cell may individually act as a temperature sensor.

Wherein the resistive material includes, but is not limited to: semiconductors such as doped ceramics, "conductive" ceramics (e.g., molybdenum disilicide), carbon, graphite, metals, metal alloys, and composites made of ceramic and metallic materials. The composite material may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbide. Examples of suitable metals include titanium, zirconium, tantalum, and platinum group metals. Examples of suitable metal alloys include stainless steel, alloys containing nickel, cobalt, chromium, aluminum, titanium, zirconium, hafnium, niobium, molybdenum, tantalum, tungsten, tin, gallium, manganese, and iron, and superalloys based on nickel, iron, cobalt, stainless steel, and iron-manganese-aluminum based alloys. The resistive material preferably comprises one or more of a ceramic doped semiconductor, a conductive ceramic, carbon, graphite, graphene, a metal alloy, a composite of a doped ceramic and a metal. More preferably, the resistive material comprises one or more of silver, platinum, copper, nickel and palladium.

The surface of the resistance layer 4 is also covered with a passivation layer 5 to prevent the resistance layer 4 from being oxidized, corroded and the like. The passivation layer 5 is made of one or more materials of gold, nickel and glass.

Wherein the resistive layer 4 has a temperature coefficient of resistance characteristic such that the resistive layer 4 functions as a temperature sensor of the electric heating element. The resistive layer 4 senses the temperature of the electrical heating element based on the temperature coefficient of resistance characteristic, and the power supply supplies power to the at least one conductive path 2 in dependence on the sensed temperature of the resistive layer 4 and a desired temperature. The aerosol-generating device further comprises a control circuit arranged for this purpose for regulating the power supplied by the control power source to the at least one conductive path 2 in dependence on a comparison between the sensed temperature and a desired temperature of the resistive layer 4. In addition, when the resistive layer 4 includes a plurality of cells arranged, each cell may be individually used as a temperature sensor.

The preparation method of the electric heating element comprises the following steps: the body 1 is formed by forming at least one conductive path 2 on the surface of the body 1 by means of pasting, plating, printing, coating, printing, vapor deposition, or the like, or by embedding the conductive path 2 in the body 1, the resistive layer 4 is formed on the surface of the body 1 by means of plating, printing, coating, printing, vapor deposition, or the like, together with the conductive path 2.

The method of controlling heating of an aerosol-generating article by an aerosol-generating device as described above comprises: measuring the resistivity of the resistive layer 4; deriving an actual temperature of the electrical heating element from the measured resistivity; comparing the actual temperature with a preset temperature; adjusting the power supplied by the power source to the at least one conductive path 2 such that the actual temperature is below the predetermined temperature.

Wherein the aerosol-generating article comprises a plurality of volatile compounds, and the predetermined temperature satisfies at least one of the following two conditions: the predetermined temperature is less than or equal to the minimum release temperature of at least one of the volatile compounds in the aerosol-generating article, and the predetermined temperature is less than or equal to the temperature at which heating of the aerosol-generating article generates aerosol but does not cause a combustion event. The preset temperature may be stored in the controller in advance. The preset temperature may also be an acceptable range, such as a range within 5% of the preset temperature.

It is noted that it has been reported in the prior art that the resistivity p increases with increasing temperature. Resistance R is V/I; where V is the voltage across resistive layer 4 and I is the current through resistive layer 4. The resistance R depends on the configuration of the resistive layer 4 and on the temperature and is represented by the following relationship: where ρ (T) is the temperature dependent resistivity, L is the length of the resistive layer 4, and S is the cross-sectional area of the resistive layer 4. For a given configuration of the resistive layer 4, L and S are fixed and can be measured. Thus, for a given design of resistive layer 4, R is proportional to ρ (T). The resistivity ρ (T) of the resistive layer 4 can be expressed in the form of a polynomial equation as follows: ρ (T) ═ Po × (1+ α 1T + α 2T2), where ρ o is the resistivity at the reference temperature To, and α 1 and α 2 are the coefficients of the polynomial. Thus, knowing the length and cross section of the resistive layer 4, the resistance R, and hence the resistivity ρ at a given temperature, can be determined by measuring the voltage V and current I of the resistive layer 4. The temperature can be obtained simply from a look-up table of the characteristic resistivity versus temperature of the resistive layer 4 used or by evaluating a polynomial of the above formula. Preferably, the processing may be simplified by representing the curve of resistivity p versus temperature in one or more (preferably two) linear approximations within the temperature range applicable to tobacco. This simplifies the desired evaluation of the temperature in a controller of a control circuit with limited computational resources. A look-up table of the characteristic resistivity versus temperature of the resistive layer 4 may be stored in a controller of the control circuit.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electrical heating element for heating an aerosol-generating article, the heating element comprising a body having at least one electrically conductive pathway arranged thereon for generating heat from electrical power, wherein the body is coated on a surface thereof with a resistive layer comprising a resistive material.

2. An electrical heating element as claimed in claim 1 wherein the resistive layer overlies at least the region of the body that is in contact with the aerosol-generating article.

3. An electric heating element as claimed in claim 1, characterized in that the resistive layer is a layer structure extending continuously along the periphery of the body.

4. An electric heating element as claimed in claim 1, characterized in that the resistive layer has a temperature coefficient of resistance characteristic such that the resistive layer functions as a temperature sensor of the electric heating element.

5. The electrical heating element of claim 4, wherein said resistive layer senses a temperature of said electrical heating element based on said temperature coefficient of resistance characteristic, and said power source supplies power to at least one of said conductive paths depending on the sensed temperature of said resistive layer and a desired temperature.

6. An electrical heating element as claimed in claim 1 wherein the resistive material comprises one or more of a ceramic doped semiconductor, a conductive ceramic, carbon, graphite, graphene, a metal alloy, a composite of a doped ceramic and a metal.

7. An electrical heating element as claimed in claim 1 wherein at least one said electrically conductive path is formed on a surface of said body, at least the surface of the electrically conductive path being coated with an insulating and thermally conductive layer of an insulating and thermally conductive material, said electrically resistive layer also being coated on the surface of said insulating and thermally conductive layer.

8. An electrical heating element as claimed in claim 1 wherein at least one said electrically conductive path is formed in said body, said body being formed of an insulating and thermally conductive material.

9. The electrical heating element of claim 1, wherein each of said electrically conductive pathways is at least one of a patterned line, wire, trace, or imprint formed on said body from an electrically conductive material.

10. An electric heating element as claimed in claim 9, wherein the electrically conductive material comprises one or more of silver, platinum, copper, nickel and palladium.

11. An electrical heating element as claimed in claim 7 or 8 wherein the insulating and thermally conductive material comprises one or more of glass, ceramic, anodised metal and polyimide.

12. An electric heating element as claimed in claim 1, characterized in that the surface of the resistive layer is further coated with a passivation layer.

13. An electric heating element as claimed in claim 12, characterized in that the passivation layer is made of one or more of gold, nickel and glass.

14. An aerosol-generating device, comprising:

at least one electrical heating element as claimed in any of claims 1 to 13 for heating an aerosol-generating article to produce an aerosol;