Heating element, heating assembly and aerosol generating device
By setting a heating layer and a compensation layer on one side of the substrate, the problems of reduced yield and increased cost caused by deformation during the sintering process of plate heating elements are solved, achieving a balance between cost and benefit.
Patent Information
- Application Number
- CN202421954301.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-08-12
AI Technical Summary
The problem of decreased yield and increased production costs caused by deformation of the heating layer during the sintering process of plate heating elements.
A heating layer is set on one side of the substrate, and a compensation layer made of different materials is used to balance the stress during the high-temperature sintering process. A second material with a lower price is selected as the compensation layer to reduce costs.
It effectively prevents substrate deformation, improves the yield of heating elements, and reduces production costs.
Smart Images
Figure CN223810379U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of heat-not-burn, in particular to a heating element, a heating assembly and an aerosol-generating device. BACKGROUND
[0002] An aerosol-generating device refers to a device that forms an aerosol by heating a stored aerosol-generating substrate. The aerosol-generating substrate is usually solid and is heated at a low temperature, usually around 300°C. Compared with traditional cigarettes, the release of tar and harmful substances in smoke is greatly reduced.
[0003] A sheet-type heating element is a kind of heating element widely used in aerosol-generating devices. By inserting the sheet-type heating element into the aerosol-generating substrate, the heat emitted by the electrically resistive material in the heating element after being electrified can heat the aerosol-generating substrate to generate an aerosol.
[0004] One of the process routes for manufacturing a sheet-type heating element is to use high-temperature ceramic co-firing technology. By stacking multiple thin sheet-like materials together and bonding them together through sintering at high temperature, a complete circuit is formed. In order to reduce the number of sintering, the heating circuit is usually printed on the cast sheet and sintered together, but the presence of the heating circuit will cause the cast sheet to deform during the sintering process, thereby affecting the yield of the sheet-type heating element and increasing the manufacturing cost. UTILITY MODEL CONTENT
[0005] Therefore, it is necessary to provide a heating element, a heating assembly and an aerosol-generating device to solve the problem of deformation of the sheet-type heating element during sintering.
[0006] A heating element, comprising:
[0007] a substrate having a first surface and a second surface arranged opposite to each other;
[0008] a heating layer formed on the first surface, the heating layer being formed of a first material; and
[0009] a compensation layer formed on the second surface, the compensation layer being formed of a second material different from the first material.
[0010] In one embodiment, the difference between the coefficient of thermal expansion of the first material and the coefficient of thermal expansion of the second material is ±3x10 -6 / ℃.
[0011] In one embodiment, the shape of the orthographic projection of the compensation layer on the substrate is the same as the shape of the orthographic projection of the heating layer on the substrate.
[0012] In one embodiment, the second material includes a glass material; or
[0013] The second material comprises at least one base metal material.
[0014] In one of the embodiments, the first material is a tungsten-based slurry; or
[0015] The first material comprises at least one noble metal material.
[0016] In one of the embodiments, the heating body further comprises a first protective layer, which covers a side surface of the heating layer away from the first surface.
[0017] In one of the embodiments, the heating body further comprises a second protective layer, which covers a side surface of the compensating layer away from the second surface.
[0018] In one of the embodiments, the heating body further comprises a wire, which is electrically connected to one end of the heating layer.
[0019] A heating assembly, comprising the above heating body and a fixing base, one end of the heating body being inserted into the fixing base.
[0020] An aerosol generating device, comprising the above heating assembly, the aerosol generating device further comprising a battery assembly, which is connected to one end of the heating assembly and electrically connected to the heating assembly.
[0021] Compared with the scheme of forming the heating layer on both sides of the substrate by using the same material, the heating body of the present application only sets the heating layer formed by the first material on one side of the substrate, and sets the compensating layer formed by the second material on the other side. During the high-temperature sintering process, the heating layer and the compensating layer simultaneously deform to a certain extent, and at the same time, a certain stress is applied to both sides of the substrate, thereby reducing the deformation of the substrate caused by uneven stress on both sides. Since the compensating layer is formed by the second material different from the first material, the selection of the second material does not need to consider the heating performance of the heating body, so a cheaper material can be selected, thereby reducing the production cost of the heating body without affecting the yield of the heating body. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 FIG. 1 is a structural schematic diagram of an aerosol generating device according to an embodiment of the present application.
[0023] Figure 2 FIG. 2 is a structural schematic diagram of a heating assembly according to an embodiment of the present application.
[0024] Figure 3 FIG. 3 is a structural schematic diagram of a heating body according to an embodiment of the present application.
[0025] Figure 4 FIG. 4 is a structural schematic diagram of a heating body according to another embodiment of the present application.Figure 1 A decomposition schematic view of the heating element.
[0026] Explanation of reference numerals:
[0027] 1. An aerosol-generating device;
[0028] 10. A heating assembly; 20. A battery assembly; 30. A housing assembly;
[0029] 100. A heating element; 110. A base; 120. A heating layer; 130. A compensating layer; 140. A first protective layer; 150. A second protective layer; 160. A lead wire; 200. A fixing seat. DETAILED DESCRIPTION
[0030] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.
[0031] In the description of the present application, it should be understood that, if there are terms such as "length", "thickness", "upper", "inner", "outer" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0032] In addition, if there are terms such as "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features referred to. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0033] In the present application, unless otherwise specifically defined and limited, if the terms "connected", etc. appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be a communication or interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0034] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium.
[0035] It should be noted that if an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "upper", "lower" and the like used in the present application are only for the purpose of illustration and do not mean the only embodiment.
[0036] As shown in Figure 1 , the embodiment of the present application provides an aerosol generating device 1 for heating an aerosol generating substrate to generate an aerosol for a user, the aerosol generating substrate can be in the form of a solid in a pulverized, granulated, powdered, particulate, strip or sheet form, and the aerosol generating substrate includes but is not limited to a material for medical, health, health, beauty purposes, which can be made of plant roots, stems, leaves, flowers, buds, seeds and other materials.
[0037] Please continue to refer to Figure 1 , the aerosol generating device 1 includes a heating assembly 10, a battery assembly 20 and a housing assembly 30. The housing assembly 30 has a receiving cavity 30a with one end open, and the aerosol generating substrate is at least partially received in the receiving cavity 30a. One end of the heating assembly 10 extends into the receiving cavity 30a and is inserted into the aerosol generating substrate, and the battery assembly 20 is connected to the other end of the heating assembly 10 and is electrically connected to the heating assembly 10. The heating assembly 10 can heat the aerosol generating substrate under the action of the electric energy of the battery assembly 20, and the aerosol generating substrate generates an aerosol after being heated for the user to use.
[0038] Referring to Figure 2 and Figure 3 , Figure 2 , a structural schematic view of the heating assembly of an embodiment of the present application is shown, Figure 3 , a structural schematic view of the heating body in an embodiment of the present application is shown.
[0039] The heating assembly 10 includes a heating body 100 and a fixing seat 200, one end of the heating body 100 is inserted into the fixing seat 200, and the other end of the heating body 100 can be inserted into the aerosol generating substrate to heat the aerosol generating substrate.
[0040] Further, in combination with Figure 4 shown, Figure 4A decomposition diagram of the heating element 100 in an embodiment of the present application is shown. The heating element 100 is a multi-layer structure, including a base 110 and a heating layer 120 arranged on one side of the base 110. The base 110 is used to support the heating layer 120. One end of the heating layer 120 is electrically connected to the wire 160 to be electrically connected to the battery assembly 20 through the wire 160. The heating layer 120 is specifically an electric resistance circuit and can heat the aerosol generating substrate under the action of the electric energy of the battery assembly 20. In addition, the heating layer 120 can also obtain the surface temperature of the heating layer 120 by detecting the change of the resistance value of the heating layer 120 to control the heating effect.
[0041] As described in the background, the heating element is usually sintered by high-temperature ceramic co-firing technology. In order to reduce the sintering times, the heating layer is usually formed on one side of the base by screen printing before sintering. However, the heating layer expands and deforms during high-temperature sintering, which generates stress on one side of the base, causing the base to deform due to uneven stress on both sides, thereby affecting the yield of the heating element and increasing the manufacturing cost of the heating element.
[0042] In order to solve the problem of deformation of the heating element during high-temperature sintering, the current production process is to form the same heating layer on both sides of the base. During high-temperature sintering, the heating layers on both sides deform at the same time, thereby effectively balancing the stress on both sides of the base to prevent the base from deforming. However, the above-mentioned method significantly increases the area of the heating layer, thereby increasing the production cost of the heating element.
[0043] In view of the above technical problems, the heating element 100 of the present application further includes a compensation layer 130. Specifically, the base 110 includes a first surface and a second surface arranged opposite to each other. The heating layer 120 is formed on the first surface, and the compensation layer 130 is formed on the second surface. The heating layer 120 is formed of a first material, and the compensation layer 130 is formed of a second material different from the first material.
[0044] In this way, compared with the scheme of forming the heating layer 120 on both sides of the base 110 by the same material, the present application only sets the heating layer 120 formed of the first material on one side of the base 110, and sets the compensation layer 130 formed of the second material on the other side. During high-temperature sintering, the heating layer 120 and the compensation layer 130 deform to a certain extent at the same time, and simultaneously exert a certain stress on both sides of the base 110, thereby reducing the deformation of the base 110 caused by uneven stress on both sides. Since the compensation layer 130 is formed of the second material different from the first material, the selection of the second material does not need to consider the heating performance of the heating element 100. Therefore, a cheaper material can be selected, thereby reducing the production cost of the heating element 100 without affecting the yield of the heating element 100.
[0045] In some embodiments, the difference between the thermal expansion coefficient of the first material and the thermal expansion coefficient of the second material is ±3x10 -6 / ℃, i.e., the value of α1-α2 is between -3x10 -6 / ℃ and 3x10 -6 / ℃.
[0046] Thus, since the thermal expansion coefficient of the first material and the thermal expansion coefficient of the second material are similar or even the same, the deformation amount generated by the heat generation layer 120 and the compensation layer 130 during high-temperature sintering is similar or even the same, thereby balancing the stress on both sides of the substrate 110, and effectively preventing the substrate 110 from deforming during high-temperature sintering. It can be understood that the specific values of the thermal expansion coefficient of the first material and the thermal expansion coefficient of the second material are set according to actual needs, and preferably, the difference between the two is as small as possible, thereby more effectively reducing the deformation amount of the heat generation body 100.
[0047] The thermal expansion coefficient is a physical quantity that measures the change in length, area or volume of an object due to temperature change, and represents the change in length value caused by unit temperature change, which is a manifestation of the physical properties of the object under constant pressure.
[0048] In some embodiments, the heat generation body 100 has a polygonal sheet structure, and the heat generation body 100 extends longitudinally along a straight line direction and includes a piercing end and a connecting end arranged opposite in the length direction. The piercing end has a triangular pointed structure, thereby facilitating the heat generation body 100 to pierce into the aerosol generating substrate. The connecting end is connected to the battery assembly 20 through the lead wire 160, and the battery assembly 20 supplies power to the heat generation body 100 through the lead wire 160. It can be understood that the shape of the heat generation body 100 is not limited thereto, and can be set as needed to meet different requirements.
[0049] The substrate 110 has a sheet structure formed of a high-temperature resistant material such as ceramic, and serves as a support structure to provide support for other film layer structures. The substrate 110 has a first surface and a second surface parallel to each other on opposite sides in the thickness direction thereof. It can be understood that the material forming the substrate 110 is not limited thereto, and can be set as needed to meet different requirements.
[0050] In some embodiments, the first material is tungsten-based slurry, and the thermal expansion coefficient of tungsten is about 4.5x10 -6 / ℃ in the temperature range of 25°C to 1000°C. In other embodiments, the first material is at least one of a noble metal material, and specifically in an embodiment, the first material is platinum, and the thermal expansion coefficient of platinum is about 8.8x10 -6 / ℃. It can be understood that the first material is not limited thereto, and the first material can be formed of a single material or a mixture of multiple materials.
[0051] In some embodiments, the second material is a glass material, and the thermal expansion coefficients of different compositions of the glass material vary in the range of (0.5-15) x 10 -6 / ℃. The glass material with a thermal expansion coefficient similar to that of the first material can be selected as the second material according to the thermal expansion coefficient of the first material. Since the price of the glass material is lower than that of the tungsten slurry and the noble metal material, the manufacturing cost of the heating element 100 can be effectively reduced while the deformation of the heating element 100 is reduced.
[0052] In other embodiments, the second material is at least one base metal material, wherein the base metal material includes all metal materials other than the noble metal material, such as iron, copper, nickel, aluminum, lead, zinc, tin, and tungsten. Specifically, the corresponding base metal material can be selected as the second material according to the thermal expansion coefficient of the first material. Since the price of the base metal material is lower than that of the noble metal material, the manufacturing cost of the heating element 100 can be effectively reduced while the deformation of the heating element 100 is reduced.
[0053] It can be understood that, based on the different first materials, the second material with a corresponding thermal expansion coefficient can be selected according to the thermal expansion coefficient of the first material, and the second material can be formed of a single material or a mixture of different materials.
[0054] In a specific embodiment, the first material is a tungsten slurry, and the second material is a glass material. In another specific embodiment, the first material is at least one noble metal material, and the second material is at least one base metal material.
[0055] In some embodiments, in order to further reduce the deformation of the heating element 100 during the sintering process, the heating layer 120 and the compensation layer 130 are symmetrically arranged with the substrate 110 as the symmetry plane, i.e., the shape of the orthographic projection of the heating layer 120 on the substrate 110 is the same as the shape of the orthographic projection of the first and second surfaces of the compensation layer 130 on the substrate 110, respectively. In this way, the deformation degrees of the heating layer 120 and the compensation layer 130 are more consistent, the difference in the stress applied to the opposite sides of the substrate 110 is smaller, and the forming process of the compensation layer 130 is simplified, further reducing the production cost of the heating element 100.
[0056] In some embodiments, the heating element 100 further includes a first protective layer 140 and a second protective layer 150, the first protective layer 140 covers a side surface of the heating layer 120 away from the first surface, and the second protective layer 150 covers a side surface of the compensation layer 130 away from the second surface, and the first protective layer 140 and the second protective layer 150 are respectively used to protect the heating layer 120 and the compensation layer 130 from being damaged by the external environment.
[0057] Specifically in some embodiments, the first protective layer 140 and the second protective layer 150 can be glass glaze layers, ceramic glaze layers or made of other dense high-temperature-resistant materials, and can be formed by at least one of a physical vapor deposition (PVD) process and a chemical vapor deposition (CVD) process. In this way, the first protective layer 140 and the second protective layer 150 have high smoothness and small surface energy, thereby effectively preventing the condensed material generated in the atomization process of the aerosol generating substrate from adhering to the first protective layer 140 and the second protective layer 150 and being easy to clean, and further having high safety, which can effectively avoid damage to the user's body.
[0058] The heating element 100, the heating assembly 10, and the aerosol generating device 1 described above can effectively balance the stress on both sides of the base body 110 during the sintering process by simultaneously arranging the heating layer 120 and the compensation layer 130 on both sides of the base body 110, thereby preventing the base body 110 from deforming due to uneven stress on both sides and improving the yield of the heating element 100. Moreover, since the compensation layer 130 and the heating layer 120 are formed of different materials, the production cost of the heating element 100 can be effectively reduced, thereby reducing the purchase cost of the aerosol generating device 1 and facilitating the further promotion of the aerosol generating device 1.
[0059] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.
[0060] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.
Claims
1. A heat generating body, characterized by comprising: The heating body comprises: a base formed of a ceramic material, the base having a first surface and a second surface disposed opposite to each other; a heating layer formed on the first surface, the heating layer being formed of a first material, the heating layer being configured to generate heat under the action of electric energy; a compensation layer formed on the second surface, the compensation layer being formed of a second material different from the first material, the compensation layer being configured to balance stress on both sides of the base during a sintering process. A shape of a normal projection of the compensation layer on the base is identical to a shape of a normal projection of the heating layer on the base.
2. The heat generating body according to claim 1, characterized by a difference between the coefficient of thermal expansion of the first material and the coefficient of thermal expansion of the second material is ±3x10 -6 / °C.
3. The heat generating body according to claim 1, characterized by The second material comprises a glass material; or 4. The heat generating body according to any one of claims 1 to 3, characterized by The second material comprises at least one base metal material. The first material is a tungsten-based slurry; or 5. The heat generating body according to any one of claims 1 to 3, characterized by The first material comprises at least one noble metal material. The heating body further comprises a first protective layer covering a side surface of the heating layer opposite to the first surface.
6. The heat generating body according to claim 1, wherein The heating body further comprises a second protective layer covering a side surface of the compensation layer opposite to the second surface.
7. The heat generating body according to claim 1 or 6, characterized by The heating body further comprises a lead wire electrically connected to one end of the heating layer.
8. The heat generating body according to claim 1, wherein The heating assembly comprises the heating body and a fixing seat, one end of the heating body being inserted into the fixing seat.
9. A heating assembly, characterized by The aerosol generating device comprises the heating assembly and a battery assembly, the battery assembly being connected to one end of the heating assembly and electrically connected to the heating assembly.
10. An aerosol-generating device comprising: