CN218790577U

CN218790577U - Heating element and aerosol generating device

Info

Publication number: CN218790577U
Application number: CN202222614519.1U
Authority: CN
Inventors: 丁晗晖; 孙耀明; 吴伟
Original assignee: Shenzhen ALD Technology Co Ltd
Current assignee: Shenzhen ALD Technology Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-04-07
Anticipated expiration: 2032-09-30

Abstract

The application discloses heat-generating body, aerosol generating device, the heat-generating body sets up in aerosol generating device for heating aerosol forms the matrix, and volatilizes any one composition formation in the aerosol formation matrix and supply the aerosol that the user inhaled, the heat-generating body includes: the composite heating body comprises a first heating layer and a second heating layer which are arranged in a stacked mode, the resistivity of the first heating layer is smaller than that of the second heating layer, and the first heating layer and the second heating layer are made of metal. The composite heating body is of an integral structure, two heating layers with different resistivities are arranged in a stacked mode to form gradient heat distribution, the heating performance of the heating body can be enhanced, and the performance that the resistivity and the resistance temperature coefficient are both good is obtained, so that the utilization efficiency of heat and the taste of aerosol are improved; can also realize the temperature control dry burning prevention function.

Description

Heating element and aerosol generating device

Technical Field

The application relates to the technical field of smoking set, in particular to a heating body and an aerosol generating device.

Background

With the rapid development of the electronic smoke sol generating device, the heating body of the electronic smoke sol generating device becomes a core component, and the overall design and the performance quality level of the aerosol generating device are determined. Existing aerosol generating devices generate an aerosol by heating a different form of aerosol generating substrate (e.g. tobacco) and deliver the aerosol to a user for consumption. The heating elements commonly used at present are of two types, one is a porous ceramic heating element, and the other is a cotton core heating element and a heating wire;

on one hand, the existing plane cotton core heating body achieves the effect of cigarette discharging by heating the tobacco tar absorbed by the oil guide body through the heating wire, the taste and the smoke amount are both good, however, as one surface of the heating body is the oil guide body and the other surface is the atomization cavity, the oil guide body is continuously supplied with atomized liquid, and the heat consumption of the heating body close to the oil guide body is large; the atomizing cavity is internally provided with aerosol and air, the heat consumption is relatively small, the difference of the heat consumption of the two surfaces of the heating body is large, the heating body generates heat unevenly, the heating efficiency of the heating body is reduced, and the surface close to the atomizing cavity is easy to burn.

On the other hand, metals are good conductors, the electronic aerosol generating device generally adopts metals as heating elements, and the commonly used heating materials are alloy materials such as iron-chromium-aluminum alloy and nickel-chromium alloy, however, the existing heating materials made of alloy materials have the following defects, which limit the application of the heating materials in the aerosol generating device:

(1) The iron-chromium-aluminum alloy has higher resistivity, but the surface of the iron-chromium-aluminum alloy is easy to oxidize, and particularly, iron ions are easy to separate out after the iron-chromium-aluminum alloy is contacted with tobacco tar for a long time so that atomized liquid is discolored; in addition, the iron-chromium-aluminum alloy has a small resistance temperature coefficient, cannot realize the temperature control function of a heating material, and cannot play a role in preventing dry burning.

(2) The nickel-chromium-iron alloy has high resistivity, small resistance temperature coefficient, good heating performance and temperature control function, but can separate out nickel ions after contacting with atomized liquid for a long time, and does not meet the safety requirement.

(3) 316 stainless steel has the characteristic of high safety, but its resistivity is relatively low (about half of iron-chromium-aluminum alloy), so when it is used as a heating element, if it needs to satisfy good heating efficiency, it needs to design a larger size, it cannot satisfy the requirement of the electronic aerosol generating device for micro-quantity, and it brings inconvenience to the size design.

Therefore, in order to solve one or more problems of heating efficiency, temperature control dry burning prevention, safety, prevention of color change of atomized liquid, inconvenience in design size and the like of the heating element, a new heating element is researched, which is a problem to be solved urgently in the field of electronic cigarettes.

SUMMERY OF THE UTILITY MODEL

The application provides a heat-generating body, aerosol generating device, and the heat-generating body of this application has the advantage that the efficiency of generating heat is high, the dry combustion method is prevented in control by temperature change, the size suits and the security is high, can improve the comprehensive properties of heat-generating body.

In a first aspect, the present application provides a heat-generating body for heating an aerosol-forming substrate and volatilising any component of the aerosol-forming substrate to form an aerosol for inhalation by a user, the heat-generating body comprising:

the composite heating body comprises a first heating layer and a second heating layer which are arranged in a stacked mode, the resistivity of the first heating layer is smaller than that of the second heating layer, and the first heating layer and the second heating layer are made of metal.

In some embodiments, the material of the first heat-generating layer includes any one of first stainless steel and TA-type titanium alloy.

In some embodiments, the first stainless steel comprises any one of stainless steel 304, stainless steel 316L, and stainless steel 317L.

In some embodiments, the TA-type titanium alloy includes any one of titanium alloy TA1, titanium alloy TA2, and titanium alloy TA 3.

In some embodiments, the ratio of the thickness of the first heat-generating layer to the composite heat-generating body is (0.1 to 0.9): 1.

in some embodiments, the second heat generating layer includes any one of second stainless steel, ferrochromium alloy, nichrome and TC type titanium alloy.

In some embodiments, the second stainless steel comprises any one of stainless steel 904, stainless steel 254smo, and stainless steel N08926.

In some embodiments, the iron-chromium-aluminum alloy includes any one of 0Cr25Al5 and 0Cr27Al7Mo 2;

in some embodiments, the nichrome comprises any one of Cr20Ni80, cr15Ni60, and Cr20Ni 35.

In some embodiments, the TC type titanium alloy includes any one of titanium alloy TC4, titanium alloy TC7, and titanium alloy TC 10.

In some embodiments, the material of the second heat generating layer includes any one of an iron-chromium-aluminum alloy and a nickel-chromium-iron alloy, the composite heat generating body further includes a third heat generating layer stacked on the surface of the second heat generating layer, and the resistivity of the third heat generating layer is smaller than or greater than that of the second heat generating layer.

In some embodiments, a ratio of a total thickness of the first heat-generating layer and the third heat-generating layer to a thickness of the composite heat-generating body is (0.1 to 0.9): 1.

in some embodiments, the third heat generating layer includes any one of first stainless steel and TA type titanium alloy.

In some embodiments, a single mass ratio of a metal impurity element including any one of nickel, chromium, and lead on a surface of the heat-generating body is less than 30%.

In some embodiments, the material of the second heat generating layer includes any one of second stainless steel and TC-type titanium alloy, the composite heat generating body further includes a third heat generating layer stacked on the surface of the first heat generating layer, and the resistivity of the third heat generating layer is smaller or larger than that of the first heat generating layer.

The ratio of the total thickness of the second heating layer and the third heating layer to the thickness of the composite heating body is (0.1-0.9): 1.

in some embodiments, the material of the third heat generating layer includes any one of first stainless steel and TA-type titanium alloy.

In some embodiments, the material of the third heat generating layer includes any one of first stainless steel and TA-type titanium alloy, and the first stainless steel includes any one of stainless steel 304, stainless steel 316L and stainless steel 317L.

In some embodiments, the material of the third heat generating layer includes any one of first stainless steel and TA type titanium alloy, and the TA type titanium alloy includes any one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3.

In some embodiments, the thickness of the composite heat-generating body is 0.06mm to 0.2mm.

In some embodiments, the heating element has a resistivity of 0.79 μ Ω · m to 1.49 μ Ω · m.

In some embodiments, the heat generating body has a temperature coefficient of resistance of 77 ppm/deg.C to 100 ppm/deg.C.

In some embodiments, the difference in thermal expansion coefficients of the first and second heat-generating layers is less than 4 × 10 ^-6 。

In some embodiments, any one of the first heat-generating layer and the second heat-generating layer has an elongation at break of more than 10%.

In some embodiments, the heat-generating body has a set pattern.

In some embodiments, a projected area of the first heat generation layer on the second heat generation layer is equal to or smaller than an area of a surface of the second heat generation layer in contact with the first heat generation layer; or the projection area of the second heat generation layer on the first heat generation layer is smaller than or equal to the area of the surface of the first heat generation layer, which is in contact with the second heat generation layer.

In a second aspect, the present application provides an aerosol-generating device comprising:

a housing having a receiving cavity for receiving an aerosol generating substrate;

the heating element is arranged in the accommodating cavity and used for heating the aerosol generating substrate, wherein the heating element is the heating element of the first aspect.

The technical scheme provided by the application has the following beneficial effects at least:

the composite heating body is of an integral structure and comprises a first heating layer and a second heating layer which are arranged in a laminated mode, the heating layers with two different resistivities are arranged in a laminated mode to form gradient heat distribution, the heating performance of the heating body can be enhanced, the heating body has proper resistivity and resistance temperature coefficient when in use, atomized liquid can be fully and quickly formed into aerosol by the heating body, the heat utilization efficiency is improved, the taste burst is improved, the taste of the aerosol is effectively improved, and the user experience is enhanced; the heating body of this application can also realize the control by temperature change and prevent dry combustion method function, and the size adaptation for the heating body has the characteristics of lightweight, small volume. Compared with a single-material heating body, the heating body has the advantages that gradient heat distribution is carried out in the thickness direction of the heating body according to different media of the first heating layer and the second heating layer in the heating body, and the comprehensive performance of the heating body can be improved.

The application provides a compound heat-generating body of 316L stainless steel and 904L stainless steel, its heat-generating body has heat gradient distribution in the thickness direction, has higher resistance temperature coefficient and suitable resistivity, realizes accurate accuse temperature when can guaranteeing heat-generating body heating efficiency, prevents the dry combustion method effect.

The application provides a TA1 titanium alloy and TC4 titanium alloy complex heat-generating body, and its heat-generating body has heat gradient distribution in the thickness direction, has the resistivity that can obtain higher and higher resistance temperature coefficient, has the control by temperature change function when can realizing improving heating efficiency, and its comprehensive properties is excellent.

The application also provides a heating element compounded by the 316L stainless steel, the 0Cr25Al5 alloy and the 316L stainless steel, the heating element can obtain excellent resistivity and reasonable heat gradient distribution, the surface of the heating element can resist corrosion and oxidation, the heating element can be repeatedly and circularly heated at 0-400 ℃ in the using process, and the problems of layering and cracking can not occur; and no large amount of nickel ions are separated out, so that the use safety of the heating body is improved.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a side view of a two-layer composite heat-generating body provided in the present application;

fig. 2 is a side view of a heat generating body in which a first heat generating layer, a second heat generating layer, and a third heat generating layer are laminated in this order as provided in the present application;

fig. 3 is a side view of a heat generating body in which a third heat generating layer, a first heat generating layer, and a second heat generating layer are laminated in this order as provided in the present application;

FIG. 4 is a schematic view showing the structure of a two-layer composite patterned heat-generating body provided in the present application;

fig. 5 is a schematic structural view of a patterned heat generating body in which a first heat generating layer, a second heat generating layer, and a third heat generating layer are sequentially stacked according to the present application;

fig. 6 is a schematic structural view of a two-layer composite patterned heat generating body with a local area of only a first heat generating layer provided herein;

fig. 7 is a schematic structural diagram of a three-layer composite patterned heat-generating body with a local area only being a first heat-generating layer according to the present application;

fig. 8 is a schematic structural view of a patterned heat generating body provided in the present application, of which a partial region is only a third heat generating layer.

The attached drawings are as follows:

10-composite heating element body;

1-a first heat-generating layer;

2-a second heat-generating layer;

3-the third heating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In the description of the present specification, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected", "fixed", and the like are to be construed broadly and may, for example, be fixed or removable, integral or electrically connected; may be directly connected or indirectly connected through an intermediate.

The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In the description of the present application, it should be understood that the directional terms "upper", "lower", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

The application provides a heat-generating body, this heat-generating body setting just soak in the aerosol generating device, and the heat-generating body is connected with the power for heating aerosol formation substrate, when the smoking set is in operating condition, the aerosol formation substrate can be placed in the heating to the heater, makes arbitrary composition in the aerosol formation substrate volatilize into the aerosol, in order to supply the user to inhale.

Specifically, as shown in fig. 1, the heat generating body includes:

the composite heating element comprises a composite heating element body 10, wherein the composite heating element body 10 comprises a first heating layer 1 and a second heating layer 2 which are arranged in a stacked mode, the resistivity of the first heating layer 1 is smaller than that of the second heating layer 2, and the first heating layer 1 and the second heating layer 2 are made of metal.

In the above scheme, the composite heating body 10 of the present application is an integral structure, the composite heating body 10 includes the first heating layer 1 and the second heating layer 2 which are stacked, and the heating layers with two different resistivities are stacked to form gradient heat distribution, so that the heating performance of the heating body can be enhanced, and the heating body has appropriate resistivity and resistance temperature coefficient when in use, so that the heating body can not only fully and quickly enable the atomized liquid to form aerosol, thereby improving the utilization efficiency of heat, improving the taste burst, effectively improving the taste of aerosol, and enhancing the user experience; the heating body of this application can also realize the control by temperature change and prevent dry combustion method function, and the size adaptation for the heating body has the characteristics of lightweight, small volume. Compared with a single-material heating body, the heating body has the advantages that gradient heat distribution is performed in the thickness direction of the heating body according to different media of the first heating layer 1 and the second heating layer 2 in the heating body, and the comprehensive performance of the heating body can be improved.

The Temperature Coefficient of Resistance (TCR) represents the relative change in resistance of a resistor when the temperature changes by 1 degree Celsius, and is given in ppm/DEG C. The heating element resistance temperature coefficient of this application is suitable, can carry out good temperature control to the heating element, avoids causing harm and reduction taste to the human body because too high temperature can lead to the composition of tobacco tar, leads oily material to change, also can avoid the too high problem of pasting the core that produces of heating element temperature simultaneously.

In some embodiments, the ratio of the thickness of the first heat-generating layer 1 to the composite heat-generating body 10 is (0.1 to 0.9): specifically, the ratio of the thickness of the first heat-generating layer 1 to the thickness of the composite heat-generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, etc., of course, other values within the above range can also be used, and it is not limited herein, and it can be understood that the thickness of the heating element is the thickness of the composite heating element body 10, and the application can control the ratio of the thicknesses of the first heating layer 1 and the composite heating element body 10, that is, the ratio of the thicknesses of the first heating layer 1 and the second heating layer 2, so as to adjust the resistivity and the resistance temperature coefficient of the heating element, and also can adjust the heating temperature of the heating element, so as to realize temperature control, and thus can meet the diversified requirements of users. If the ratio of the thickness of the first heat-generating layer 1 to the thickness of the composite heat-generating body 10 is less than 0.1:1 or greater than 0.9:1, the process requirements of material preparation cannot be met, and the comprehensive performance of the heating element is reduced.

In some embodiments, the material of the first heat-generating layer 1 includes any one of first stainless steel and TA-type titanium alloy. Illustratively, the first stainless steel includes any one of stainless steel 304, stainless steel 316L, and stainless steel 317L. The TA type titanium alloy includes any one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3. The electric resistivity of the heating layer made of the material is small, the material has the advantages of high temperature resistance and stable performance, the content of metal impurity ions is low or the metal impurity ions are not easy to separate out, and the problem of color change of atomized liquid in the using process can be reduced.

In some embodiments, the material of the second heat generation layer 2 includes any one of second stainless steel, ferrochromium alloy, inconel, and TC type titanium alloy. Illustratively, the second stainless steel includes stainless steel 904, stainless steel 254smo, stainless steel N08926, and the like. The iron-chromium-aluminum alloy comprises 0Cr25Al5, 0Cr27Al7Mo2 and the like, the nickel-chromium-iron alloy comprises Cr20Ni80, cr15Ni60, cr20Ni35 and the like, and the TC type titanium alloy comprises titanium alloy TC4, titanium alloy TC7, titanium alloy TC10 and the like. The second heating layer 2 made of the material has higher resistivity, can generate more heat in the heating process, and improves the heating efficiency.

In some embodiments, when the material of the second heat generating layer 2 includes any one of iron-chromium-aluminum alloy and nickel-chromium-iron alloy, the composite heat generating body 10 further includes a third heat generating layer 3 stacked on the surface of the second heat generating layer 2, that is, the heat generating body of the present application is a "sandwich" stacked structure, as shown in fig. 2, the composite heat generating body 10 includes a first heat generating layer 1, a second heat generating layer 2 and a third heat generating layer 3 stacked on top of each other, the resistivity of the first heat generating layer 1 is smaller than that of the second heat generating layer 2, and the resistivity of the third heat generating layer 3 is smaller than or larger than that of the second heat generating layer 2. In some embodiments, the first heat generating layer 1 and the third heat generating layer 3 are located on the surface of the second heat generating layer 2 to form a protective layer, so that the second heat generating layer 2 is not in direct contact with the aerosol generating substrate, and volatile impurity ions and metal impurity ions are prevented from being separated out of the aerosol generating substrate due to the fact that the second heat generating layer 2 made of ferrochromium alloy or nickel-chromium-iron alloy generates heat, and the safety of the heat generating body is improved. When the resistivity of the third heating layer 3 is greater than that of the second heating layer 2, the first heating layer 1, the second heating layer 2 and the third heating layer 3 form a gradient temperature along the thickness direction, so that the heating efficiency of the heating element is enhanced and the temperature control function is realized.

In some embodiments, the thicknesses of the first heat-generating layer 1 and the third heat-generating layer 3 may be the same or different, and it is only necessary that the ratio of the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 to the thickness of the heat-generating body 10 satisfies (0.1 to 0.9): 1, specifically, the ratio of the total thickness of the first heat generating layer 1 and the third heat generating layer 3 to the thickness of the composite heat generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4:

1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, and certainly, other values within the above range can be also provided, and the present application is not limited herein, and the ratio of the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 to the thickness of the composite heat-generating body 10 can be controlled, so as to adjust the resistivity and the resistance temperature coefficient of the heat-generating body, and thus, the diversified requirements of users can be met.

In some embodiments, when the material of the second heat generating layer 2 includes any one of second stainless steel and TC type titanium alloy, the composite heat generating body 10 further includes a third heat generating layer 3 disposed on the surface of the first heat generating layer 1, as shown in fig. 3, the heat generating body of the present application is a "sandwich" structure in which the third heat generating layer 3, the first heat generating layer 1 and the second heat generating layer 2 are stacked, and the resistivity of the third heat generating layer 3 is smaller than or greater than that of the first heat generating layer 1. In some embodiments, the resistivity of the third heat generating layer 3 is smaller than that of the first heat generating layer 1, so that the third heat generating layer 3, the first heat generating layer 1 and the second heat generating layer 2 form a gradient temperature along the thickness direction, thereby enhancing the heating efficiency of the heat generating body and realizing the temperature control function.

In some embodiments, the ratio of the total thickness of the second heat generating layer 2 and the third heat generating layer 3 to the thickness of the composite heat generating body 10 satisfies (0.1 to 0.9): 1, specifically, the ratio of the total thickness of the second heat generating layer 2 and the third heat generating layer 3 to the thickness of the composite heat generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, and the like, and certainly can be other values within the above range, and the present application is not limited herein, and the ratio of the total thickness of the second heat generating layer 2 and the third heat generating layer 3 to the thickness of the composite heat generating body 10 can be controlled, so as to adjust the resistivity and the temperature coefficient of resistance of the heat generating body, and thus, the diversified requirements of users can be met.

In some embodiments, the material of the third heat generation layer 3 includes any one of the first stainless steel and a TA-type titanium alloy. It is to be understood that the materials of the first heat generation layer 1 and the third heat generation layer 3 may be the same or different. This application does not do the restriction here, can understand, can be according to user's demand optional performance close or the complementary first layer 1 and the third layer 3 that generates heat of performance, when the second generates heat the material on layer 2 and includes any one in iron chromium aluminum alloy and the nickel chromium iron alloy, first layer 1 and the third layer 3 that generates heat all can play the guard action to layer 2 that generates heat of second, make the heat-generating body can reduce the separation out of harmful substance or metallic impurity ion with the tobacco tar after contacting, improve the security performance of heat-generating body.

In some embodiments, when the heat-generating body has a laminated structure of a "sandwich" type, a single term mass ratio of a metal impurity element of a surface of the heat-generating body is less than 30%, wherein the metal impurity element includes any one of nickel, chromium, and lead. The heating element has the advantages that different metal impurity elements contained in different alloys are different, the metal impurity elements can be separated out in the using process of the heating element, atomized liquid can be caused to change color, the single-term mass ratio of the metal impurity elements on the surface of the heating element is less than 30%, the separation of the metal impurity elements can be reduced, and accordingly the use safety of the heating element is improved.

In some embodiments, the thickness of the composite heat-generating body 10 is 0.06mm to 0.2mm. Specifically, the thickness of the composite heating element body 10 may be 0.06mm, 0.1mm, 0.2mm, 0.15mm, 0.18mm, 0.2mm, and the like, and it can be understood that the thickness of the heating element is the thickness of the composite heating element body 10, and the thickness of the composite heating element body 10 is greater than 0.2mm, which results in too slow temperature rise speed and high energy consumption of the heating element; the thickness of the composite heating element body 10 is less than 0.06mm, which results in insufficient strength of the heating element.

In some embodiments, the resistivity of the heating element is 0.79 μ Ω · m to 1.49 μ Ω · m, specifically, the resistivity of the heating element may be 0.79 μ Ω · m, 0.85 μ Ω · m, 0.90 μ Ω · m, 1.00 μ Ω · m, 1.15 μ Ω · m, 1.22 μ Ω · m, 1.35 μ Ω · m, 1.49 μ Ω · m, and the like, and may be other values within the above range, which is not limited herein. Within the above range, it is shown that the heating element of the present application has excellent resistivity, can reduce the volume of the heating element, and can generate high heat, thereby improving the heating efficiency of the heating element.

In some embodiments, the temperature coefficient of resistance of the heat generating element is 77 ppm/deg.C to 100 ppm/deg.C, and specifically, the temperature coefficient of resistance of the heat generating element may be 77 ppm/deg.C, 85 ppm/deg.C, 92 ppm/deg.C, 100 ppm/deg.C, 300 ppm/deg.C, 550 ppm/deg.C, 750 ppm/deg.C, 900 ppm/deg.C, 1050 ppm/deg.C, 100 ppm/deg.C, and the like, and may be other values within the above range, although not limited thereto. The resistance temperature coefficient of the heating element is in the range, and the stability of the heating power of the heating element can be ensured.

In some embodiments, the difference in thermal expansion coefficient between the first heat-generating layer 1 and the second heat-generating layer 2 is less than 4 × 10 ^-6 Specifically, the difference in thermal expansion coefficient between the first heat-generating layer 1 and the second heat-generating layer 2 may be 5 × 10 ^-7 、8×10 ^-7 、1×10 ^-6 、4×10 ^-6 And 3X 10 ^-6 In the above range, it is shown that the expansion deformation of the first heat-generating layer 1 and the second heat-generating layer 2 is similar in the process of generating heat after the power supply of the heating element of the present application is turned on, and the compatibility between the first heat-generating layer 1 and the second heat-generating layer 2 can be improved, so that the mechanical strength of the heating element can be improved, the heating element can be heated repeatedly, and the problems of delamination and cracking do not occur. The heating body of this application need not to add extra auxiliary layer, can reduce the cost of manufacture.

For the same reason, the difference in thermal expansion coefficient between the second heat generating layer 2 and the third heat generating layer 3 is less than 4 × 10 ^-6 (ii) a The difference of thermal expansion coefficients of the first heat-generating layer 1 and the third heat-generating layer 3 is less than 4 x 10 ^-6 。

In some embodiments, the elongation at break of any one of the first heat generating layer 1 and the second heat generating layer 2 is greater than 10%, specifically, the elongation at break of any one of the first heat generating layer 1 and the second heat generating layer 2 may be 12%, 15%, 18%, 20%, 25%, 30%, 40%, and the like, and may be other values within the above range, which is not limited herein. In the above range, it is shown that the heating element material of the present application has a certain plastic deformation capability, and can avoid the breakage or the generation of cracks in the heating process of the heating element. The first heat generation layer 1 and the second heat generation layer 2 each preferably have an elongation at break of more than 10%.

In some embodiments, when the heat generating body is a three-layer structure in which the first heat generating layer 1, the second heat generating layer 2, and the third heat generating layer 3 are sequentially laminated, the elongation at break of the first heat generating layer 1 and/or the third heat generating layer 3 is greater than 10%. In other embodiments, when the heat generating body is a three-layer structure in which the third heat generating layer 3, the first heat generating layer 1, and the second heat generating layer 2 are sequentially stacked, the second heat generating layer 2 and/or the third heat generating layer 3 have a breaking elongation of more than 10%.

In some embodiments, the heating element has a set pattern, a patterned heating element, on one hand, the contact area of the heating element and the aerosol generating substrate can be increased, and uniform heat dissipation of the whole heating element is realized; on the other hand, the overall resistance of the heating element can be increased. The heat-generating body is exemplified as a mesh heat-generating body, but of course, the heat-generating body may be prepared in other shapes. That is, when the heating element includes the first heat-generating layer 1 and the second heat-generating layer 2, the heating element may be a double-layer structure in which a local region is hollowed out and the other region is formed by stacking the first heat-generating layer 1 and the second heat-generating layer 2. As shown in fig. 4, the schematic structure diagram of the patterned heating element with two layers combined is shown, as shown in fig. 5, the schematic structure diagram of the patterned heating element with three layers combined is shown.

In some embodiments, a projected area of the first heat generation layer 1 on the second heat generation layer 2 is equal to or less than an area of a surface of the second heat generation layer 2 in contact with the first heat generation layer 1 or a projected area of the second heat generation layer 2 on the first heat generation layer 1 is equal to or less than an area of a surface of the first heat generation layer 1 in contact with the second heat generation layer 2. As shown in fig. 6, the non-hollowed-out region of the heating element of the present application may be a double-layer structure in which a local region is only the first heat-generating layer 1, and the other region is formed by stacking the first heat-generating layer 1 and the second heat-generating layer 2; or the heating element can also be a double-layer structure with a local area being only the second heating layer 2 and other areas being the first heating layer 1 and the second heating layer 2 which are arranged in a stacked manner. Above-mentioned setting, when the heating-body atomizing area can be guaranteed to the one side, the quality and the cost of reduction heating-body are applicable to the demand of user's pluralism. It should be understood that the local area is only the area of the first heat generation layer 1 should be less than 50% of the area of the surface of the second heat generation layer 2 in contact with the first heat generation layer 1, or the local area is only the area of the second heat generation layer 2 should be less than 50% of the area of the surface of the first heat generation layer 1 in contact with the second heat generation layer 2.

For the same reason, when the heating element is a composite layer formed by three layers, the first heating layer 1 and the third heating layer 3 may be patterned in a suitable shape according to the user's requirement, that is, the heating element may be in a hollow-out arrangement in a local region, and the other regions are in a three-layer structure formed by combining the first heating layer 1, the second heating layer 2 and the third heating layer 3, or the arrangement of the first heating layer 1 and/or the third heating layer 3 is adaptively reduced in the other regions, the heating element structure of the first heating layer 1 is reduced as shown in fig. 7, and the heating element structures of the first heating layer 1 and the third heating element 3 are reduced as shown in fig. 8, so as to improve the heating efficiency.

The application provides a preparation method of the heating element, which comprises the following steps:

and (3) stacking the first heating layer 1 and the second heating layer 2, and then rolling and compounding to obtain a composite heating body 10, namely the heating body. The resistivity of the first heat-generating layer 1 is smaller than that of the second heat-generating layer 2, and the first heat-generating layer 1 and the second heat-generating layer 2 are both made of metal.

In the above scheme, the composite heating body 10 of the present application is an integral structure, the composite heating body 10 includes the first heating layer 1 and the second heating layer 2 which are stacked, and the heating layers with two different resistivities are stacked to form gradient heat distribution, so that the heating performance of the heating body can be enhanced, and the heating body has appropriate resistivity and resistance temperature coefficient in use, so that the heating body can not only fully and quickly form aerosol from atomized liquid, improve the utilization efficiency of heat, improve the burst taste, effectively improve the taste of aerosol, and enhance the user experience; the heating body of this application can also realize the control by temperature change and prevent dry combustion method function, and the size adaptation for the heating body has the characteristics of lightweight, small volume. The preparation method is simple in process, and the heating body is used for heating the aerosol to generate the substrate, so that the comprehensive performance of the heating body can be improved, the taste of the aerosol is effectively improved, and the user experience is enhanced.

In some embodiments, the method of producing a heat-generating body further comprises: the first heat generation layer 1 and the second heat generation layer 2 that have been compounded are subjected to patterning treatment.

In some embodiments, the patterning process includes any one of etching and stamping, wherein the stamping may be laser etching or chemical etching, and the patterning process is performed by a method conventionally used in the art, and the application is not limited herein. After the patterning treatment, a mesh-like heating element is obtained, but the heating element may be prepared in other shapes.

In some embodiments, during the patterning process, only the first heat-generating layer 1 or the second heat-generating layer 2 may be etched or punched in some areas so that only the first heat-generating layer 1 or only the second heat-generating layer 2 exists in some areas of the heat-generating body; certainly, the first heat-generating layer 1 and the second heat-generating layer 2 in some areas may be etched or punched at the same time, so that the areas are in a hollow state.

In some embodiments, the ratio of the thickness of the first heat-generating layer 1 to the composite heat-generating body 10 is (0.1 to 0.9): specifically, the ratio of the thickness of the first heat-generating layer 1 to the thickness of the composite heat-generating body 10 may be 0.1: 1. 0.2: 1. 0.3: 1. 0.4: 1. 0.5: 1. 0.6: 1. 0.7: 1. 0.8:1 and 0.9:1, and certainly, other values within the above range can be also provided, and the present application is not limited herein, and the specific value of the thicknesses of the first heat-generating layer 1 and the composite heat-generating body 10, that is, the ratio of the thicknesses of the first heat-generating layer 1 and the second heat-generating layer 2, can be controlled, so as to adjust the resistivity and the resistance temperature coefficient of the heat-generating body, and thus, the diversified requirements of users can be met.

In some embodiments, the material of the first heat-generating layer 1 includes any one of stainless steel and TA-type titanium alloy. Illustratively, the first stainless steel includes any one of stainless steel 304, stainless steel 316L, and stainless steel 317L. The TA type titanium alloy includes any one of titanium alloy TA1, titanium alloy TA2, and titanium alloy TA 3.

In some embodiments, the material of the second heat generation layer 2 includes any one of stainless steel, ferrochromium alloy, nichrome alloy, and TC type titanium alloy. Illustratively, the second stainless steel includes stainless steel 904, stainless steel 254smo, stainless steel N08926, and the like. The iron-chromium-aluminum alloy comprises 0Cr25Al5, 0Cr27Al7Mo2 and the like, the nickel-chromium-iron alloy comprises Cr20Ni80, cr15Ni60, cr20Ni35 and the like, and the TC type titanium alloy comprises TC4, TC7, TC10 and the like.

In some embodiments, when the material of the second heat generating layer 2 includes any one of an iron-chromium-aluminum alloy and a nickel-chromium-iron alloy, the composite heat generating body 10 further includes a third heat generating layer 3 stacked on the surface of the second heat generating layer 2, that is, the first heat generating layer 1, the second heat generating layer 2 and the third heat generating layer 3 are stacked, rolled, and then patterned, so as to obtain a "sandwich" type stacked heat generating body structure.

In some embodiments, when the material of the second heat generating layer 2 includes any one of the second stainless steel and the TC-type titanium alloy, the composite heat generating body 10 further includes a third heat generating layer 3 disposed on the surface of the first heat generating layer 1, that is, the third heat generating layer 3, the first heat generating layer 1, and the second heat generating layer 2 are stacked, rolled, and patterned to obtain a "sandwich" type stacked heat generating body structure.

In some embodiments, when the heating element of the present application is a "sandwich" type laminated structure, the patterned area may be formed by etching or punching the first heat-generating layer 1, the second heat-generating layer 2, and the third heat-generating layer 3 at the same time, or by etching or punching a partial area of the first heat-generating layer 1 or the third heat-generating layer 3 after etching or punching the first heat-generating layer 1, the second heat-generating layer 2, and the third heat-generating layer 3, so that the thickness of the partial area of the heating element is smaller than the total thickness of the first heat-generating layer 1, the second heat-generating layer 2, and the third heat-generating layer 3.

In some embodiments, the material of the third heat generation layer 3 includes any one of the second stainless steel and a TA-type titanium alloy. It is to be understood that the materials of the first heat generation layer 1 and the third heat generation layer 3 may be the same or different. The present application is not limited herein, and it can be understood that the first heat generating layer 1 and the third heat generating layer 3 having similar or complementary performances can be selected according to the user's needs.

The utility model provides a still provide aerosol generation device who contains above-mentioned heat-generating body, which comprises a housin, the casing has holds the chamber, it is used for acceping aerosol and produces substrate and heat-generating body to hold the chamber, the heat-generating body soaks in aerosol produces the substrate, be connected with the power through electric welding on the heat-generating body, thereby this application is coiled for the cylinder-shape self is electrically conducted to generate heat also can direct electrically conducted generate heat under the plane state and produce the heat, thereby realize heating aerosol formation substrate, guarantee the homogeneity of heating temperature distribution and the high efficiency of production aerosol.

The technical solution of the present application is explained in detail according to specific embodiments below.

Example 1

(1) Providing a first heat-generating layer 1 and a second heat-generating layer 2, wherein the first heat-generating layer 1 is 316L stainless steel (with the resistivity of 0.74 mu omega m), and the second heat-generating layer 2 is 904L stainless steel (with the resistivity of 1.00 mu omega m), and laminating the first heat-generating layer 1 and the second heat-generating layer 2, and then rolling and compounding to obtain a precursor.

(2) And carrying out chemical etching treatment on the precursor to obtain the grid-shaped heating element.

In this example, the thickness of the heat-generating body was 0.07mm, and the ratio of the thickness of the first heat-generating layer 1 in the thickness of the heat-generating body was 20%.

Example 2

(1) Providing a first heat-generating layer 1 and a second heat-generating layer 2, wherein the first heat-generating layer 1 is a TA1 titanium alloy (with the resistivity of 0.46 mu omega-m), and the second heat-generating layer 2 is a TC4 titanium alloy (with the resistivity of 1.60 mu omega-m), and laminating the first heat-generating layer 1 and the second heat-generating layer 2, and then rolling and compounding to obtain a precursor.

(2) And stamping the precursor to obtain the grid-shaped heating element.

In this example, the thickness of the heat-generating body was 0.05mm, and the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 50%.

Example 3

Unlike example 1, the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 10%.

Example 4

Unlike example 1, the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 50%.

Example 5

Unlike example 1, the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 90%.

Example 6

(1) Providing a first heat-generating layer 1, a second heat-generating layer 2 and a third heat-generating layer 3, wherein the first heat-generating layer 1 and the third heat-generating layer 3 are both 316L stainless steel (with the resistivity of 0.74 mu omega m), the second heat-generating layer 2 is iron-chromium-aluminum alloy 0Cr25Al5 (with the resistivity of 1.1 mu omega m), and the first heat-generating layer 1, the second heat-generating layer 2 and the third heat-generating layer 3 are sequentially stacked and then rolled and compounded to obtain a precursor.

In this example, the thickness of the heat-generating body was 0.08mm, and the ratio of the total thickness of the first heat-generating layer 1 and the third heat-generating layer 3 in the thickness of the heat-generating body was 50%.

Example 7

Unlike example 1, the ratio of the thickness of the first heat-generating layer 1 to the thickness of the heat-generating body was 8%.

Example 8

Unlike example 1, the ratio of the thickness of the first heat-generating layer 1 in the thickness of the heat-generating body was 93%.

Example 9

Unlike example 6, the second heat generating layer 2 was an iron-chromium-nickel alloy Ni80Cr20 (resistivity 1.09 μ Ω · m), and the total thickness of the first heat generating layer 1 and the third heat generating layer 3 accounted for 50% of the thickness of the heat generating body.

Comparative example 1

The heating element is of a single-layer structure and is made of 316L stainless steel.

Comparative example 2

The heating element is of a single-layer structure, and the material of the heating element is iron-chromium-aluminum alloy 0Cr25Al5.

Performance testing

(1) The thickness of the heat generating body and the thickness of the protective layer (i.e., the first heat generating layer 1 and the third heat generating layer 3) were measured with a microscope.

(2) And testing the nickel element content on the surface of the heating element by adopting an EDS (electron-beam EDS) energy spectrum method of a scanning electron microscope.

(3) And testing the resistivity of the heating body by using a resistivity tester.

(4) Resistance temperature system calculated by measuring resistance of heating element at constant temperature differenceNumber, wherein the temperature coefficient of resistance TCR = (R) ₂ -R ₁ )/R1(T ₂ -T ₁ ) Wherein R is ₁ Corresponding to a temperature of T ₁ Measuring the resistance value R of the heating element ₂ Corresponding to a temperature of T ₂ The resistance value of the heating element is measured.

The test data are shown in table 1:

TABLE 1 Performance parameters of the heat-generating bodies prepared in the respective examples and comparative examples

The heating elements prepared in embodiments 1 to 6 and 9 of the present application can enhance heating performance by stacking two or three heating layers, so that the heating element has excellent resistivity and a high temperature coefficient of resistance, and the heating element has a suitable structural size, and the excellent resistivity can increase the amount of heat generated by the heating element in the heating process, thereby improving heating efficiency; the higher resistance temperature coefficient enables the temperature of the heating element to be controllable, and can prevent the heating element from being dried in the using process. In addition, the heat-generating body of this application is used for heating aerosol to produce the matrix, and it can improve the outbreak, effectively promotes the taste of aerosol, reinforcing user experience.

In embodiment 1, 316L stainless steel is used as a material of the first heat generating layer, 316L stainless steel has a low resistivity of 0.74 μ Ω · m and a high TCR (temperature coefficient of resistance) of 900 ppm/degree c, 904L stainless steel is selected as a material of the second heat generating layer 2, 904L stainless steel has a high resistivity of 1.00 μ Ω · m and a low TCR (temperature coefficient of resistance) of 450 ppm/degree c, and a heat generating body obtained by rolling the first heat generating layer 1 and the second heat generating layer 2 can obtain a high TCR (temperature coefficient of resistance) and a suitable resistivity, so that accurate temperature control and dry burning prevention can be achieved while the heating efficiency of the heat generating body is ensured.

In example 2, the first heat-generating layer 1 was made of TA1 titanium alloy, the TA1 titanium alloy had a low resistivity of 0.46 μ Ω · m and a high TCR (temperature coefficient of resistance) of 3700ppm/° c, the second heat-generating layer 2 was made of TC4 titanium alloy, the TC4 titanium alloy had a high resistivity of 1.60 μ Ω · m and a low TCR (temperature coefficient of resistance) of 350ppm/° c, and the heat-generating body obtained by rolling the first heat-generating layer 1 and the second heat-generating layer 2 could have a high resistivity and a high TCR, could achieve a temperature control function while improving the heat-generating efficiency, and had an excellent overall performance.

In embodiment 6, the first heat-generating layer 1 and the third heat-generating layer of the heating element are both made of 316L stainless steel, and the 316L stainless steel is used as a food-grade metal material, so that the heating element has high safety performance in the aspect of iron, nickel, chromium and the like precipitation; the material of the second heating layer 2 is 0Cr25Al5 alloy with high resistivity, and the heating body obtained by rolling the protective layer and the heating layer can ensure that the heating body obtains excellent resistivity, the surface of the heating body is corrosion-resistant and oxidation-resistant, no large amount of nickel ions are precipitated, and the use safety of the heating body can be improved. And the utility model people experiment finds: the heating element is soaked in any fruity tobacco tar for one week and then observed, and compared with a blank tobacco tar contrast group without the heating element, the color of the tobacco tar of the heating element has no color difference, which shows that the structural design of the heating element of the embodiment can effectively prevent iron ions from being separated out from the tobacco tar.

In example 7, the thickness of the first heat-generating layer 1 is smaller than the range defined in the present application, which results in a rolling failure, and is difficult to form and to manage.

In embodiment 8, if the thickness of the first heat-generating layer 1 is greater than the range defined in the present application, the rolling failure is difficult to form, and the process is difficult to manage.

To sum up, this application can design and customize according to user's demand through selecting the material on layer that generates heat, can obtain the heat-generating body that a series of performances are excellent.

In comparative example 1, a conventional single-layer stainless steel heating element is adopted, 316L stainless steel is used as a food-grade metal material, and the heating element has high safety performance in the aspect of iron, nickel, chromium and the like precipitation, but the resistivity is low, so that the heating efficiency of the heating element is low.

In the comparative example 2, the conventional single-layer iron-chromium-aluminum alloy heating element is adopted, the iron element content on the surface is high, nickel ions are easily separated out in the use process, and the use safety of the heating element is reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heating element for heating an aerosol-forming substrate and volatilising any one component of the aerosol-forming substrate to form an aerosol for inhalation by a user, the heating element comprising:

2. A heat-generating body as described in claim 1, characterized in that the heat-generating body comprises at least one of the following features a to i:

a. the first heat-generating layer is made of any one of first stainless steel and TA type titanium alloy;

b. the first heat-generating layer is made of any one of first stainless steel and TA type titanium alloy, and the first stainless steel comprises any one of stainless steel 304, stainless steel 316L and stainless steel 317L;

c. the first heat-generating layer is made of any one of first stainless steel and TA type titanium alloy, and the TA type titanium alloy comprises any one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3;

d. the ratio of the thickness of the first heat-generating layer to the thickness of the composite heat-generating body is (0.1-0.9): 1;

e. the second heating layer is made of any one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC type titanium alloy;

f. the second heating layer is made of any one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC type titanium alloy, and the second stainless steel comprises any one of stainless steel 904, stainless steel 254smo and stainless steel N08926;

g. the second heating layer is made of any one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC type titanium alloy, wherein the iron-chromium-aluminum alloy comprises any one of 0Cr25Al5 and 0Cr27Al7Mo 2;

h. the second heating layer is made of any one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC type titanium alloy, wherein the nickel-chromium-iron alloy comprises any one of Cr20Ni80, cr15Ni60 and Cr20Ni 35;

i. the second heating layer is made of any one of second stainless steel, iron-chromium-aluminum alloy, nickel-chromium-iron alloy and TC type titanium alloy, and the TC type titanium alloy comprises any one of titanium alloy TC4, titanium alloy TC7 and titanium alloy TC 10.

3. A heating body as claimed in claim 1, characterized in that the material of the second heat generating layer includes any one of iron-chromium-aluminum alloy and nickel-chromium-iron alloy, the composite heating body further includes a third heat generating layer laminated on the surface of the second heat generating layer, and the resistivity of the third heat generating layer is smaller or larger than that of the second heat generating layer.

4. A heat-generating body as described in claim 3, characterized in that the heat-generating body comprises at least one of the following features a to e:

a. the ratio of the total thickness of the first heating layer and the third heating layer to the thickness of the composite heating body is (0.1-0.9): 1;

b. the third heating layer is made of any one of first stainless steel and TA type titanium alloy;

c. the third heating layer is made of any one of first stainless steel and TA type titanium alloy, and the first stainless steel comprises any one of stainless steel 304, stainless steel 316L and stainless steel 317L;

d. the third heating layer is made of any one of first stainless steel and TA type titanium alloy, and the TA type titanium alloy comprises any one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3;

e. the heating element is characterized in that the single mass ratio of metal impurity elements on the surface of the heating element is less than 30%, and the metal impurity elements comprise any one of nickel, chromium and lead.

5. A heat-generating body as described in claim 1, wherein the second heat-generating layer is made of any one of second stainless steel and TC type titanium alloy, and the composite heat-generating body further includes a third heat-generating layer laminated on the surface of the first heat-generating layer, and the electrical resistivity of the third heat-generating layer is smaller or larger than that of the first heat-generating layer.

6. A heat-generating body as described in claim 5, characterized in that the heat-generating body comprises at least one of the following features a to d:

a. the ratio of the total thickness of the second heating layer and the third heating layer to the thickness of the composite heating body is (0.1-0.9): 1;

d. the third heating layer is made of any one of first stainless steel and TA type titanium alloy, and the TA type titanium alloy comprises any one of titanium alloy TA1, titanium alloy TA2 and titanium alloy TA 3.

7. A heat-generating body as described in claim 1, characterized in that the heat-generating body includes any one of the following features a to e:

a. the thickness of the composite heating body is 0.06 mm-0.2 mm;

b. the resistivity of the heating element is 0.79 mu omega.m to 1.49 mu omega.m;

c. the resistance temperature coefficient of the heating element is 77 ppm/DEG C-100 ppm/DEG C;

d. the difference of thermal expansion coefficients of the first heat-generating layer and the second heat-generating layer is less than 4 x 10 ^-6 ；

e. The elongation at break of any one of the first heat-generating layer and the second heat-generating layer is greater than 10%.

8. A heat-generating body as described in any one of claims 1 to 7, characterized in that the heat-generating body has a set pattern.

9. A heat-generating body as described in claim 8, characterized in that a projected area of the first heat-generating layer on the second heat-generating layer is equal to or smaller than an area of a surface of the second heat-generating layer which is in contact with the first heat-generating layer; or the projection area of the second heat generation layer on the first heat generation layer is smaller than or equal to the area of the surface of the first heat generation layer, which is in contact with the second heat generation layer.

10. An aerosol generating device, comprising:

a heat-generating body provided in the housing chamber and configured to heat the aerosol-generating substrate, wherein the heat-generating body is the heat-generating body according to any one of claims 1 to 9.