Heating tube and aerosol generating device

Abstract

The utility model relates to a heating tube and an atomizer, and the heating tube comprises a metal matrix which is of a hollow cylindrical structure with two open ends; the first infrared layer at least partially covers the inner side wall of the metal substrate; the second infrared layer at least partially covers the outer side wall of the metal substrate; the heating film is arranged on the surface of the side, away from the metal matrix, of the second infrared layer, and the heating film is used for being electrified to heat and heating the second infrared layer, the metal matrix and the first infrared layer. According to the heating pipe, on one hand, the infrared layers are arranged on the inner side wall and the outer side wall of the metal base body, the function of protecting the metal base body can be achieved, the short circuit phenomenon of the heating pipe can be prevented, the forming process of the heating pipe can be simplified, and when one side wall of the metal base body is coated with a film, the other side wall does not need to be protected; on the other hand, the two sides of the metal base body are covered with the infrared layers, the metal base body can be effectively prevented from being corroded and rusted in the long-term use process, and therefore the service life of the aerosol generating device with the heating pipe is prolonged.

Description

Technical Field

[0001] The present application relates to the field of atomization technology, and particularly to a heating tube and an aerosol generating device. Background Art

[0002] An aerosol is a colloidal dispersion system formed by solid or liquid small particles dispersed and suspended in a gas medium. Since an aerosol can be absorbed by the human body through the respiratory system, it provides a new alternative absorption method for users. An aerosol generating device refers to a device that forms an aerosol by heating a stored atomizable medium. The atomizable medium includes a liquid, a gel, a paste, or a solid aerosol generating matrix. Heating and atomizing these media can deliver an inhalable aerosol to the user, replacing the conventional product form and absorption method.

[0003] In existing aerosol generating devices, a heating element for heating an aerosol generating matrix is usually provided. The heating element generally includes different shapes such as a sheet heating element, a needle heating element, and a tube heating element. Among them, the tube heating element heats in a circumferential surrounding manner, has a large heating area, a high heating uniformity, and does not require cleaning, and is widely used in aerosol generating devices. However, for the existing tube heating element, the film layer process on the tube substrate is complex; in addition, since the tube substrate is made of metal, there are risks such as corrosion and rusting after long-term use, and short circuit with the circuit on the peripheral wall of the tube substrate, thereby increasing the failure rate of the aerosol generating device and shortening the service life of the aerosol generating device. Summary of the Invention

[0004] Based on this, in view of the problems of complex manufacturing process, easy corrosion and rusting, and short circuit of the tube heating element, it is necessary to provide a heating tube and an aerosol generating device.

[0005] A heating tube, the heating tube comprising:

[0006] A metal substrate, having a hollow cylindrical structure with both ends open;

[0007] A first infrared layer, at least partially covering the inner sidewall of the metal substrate;

[0008] A second infrared layer, at least partially covering the outer sidewall of the metal substrate;

[0009] A heating film, disposed on a surface of the second infrared layer facing away from the metal substrate, the heating film being used for generating heat by being energized and heating the second infrared layer, the metal substrate, and the first infrared layer.

[0010] In one embodiment, the heating tube further comprises:

[0011] The first insulating layer is disposed on the inner sidewall of the metal matrix and is located between the metal matrix and the first infrared layer;

[0012] The second insulating layer is disposed on the outer sidewall of the metal matrix and is located between the metal matrix and the second infrared layer.

[0013] In one embodiment, the first insulating layer and the second insulating layer are formed of the same material.

[0014] In one embodiment, at least one end face of the metal matrix is covered with the first insulating layer and the second insulating layer; and / or at least one end face of the metal matrix is covered with the first infrared layer or the second infrared layer.

[0015] In one embodiment, the heating film includes:

[0016] A base layer disposed on the second infrared layer;

[0017] A heating circuit formed on the base layer and located between the base layer and the second infrared layer.

[0018] In one embodiment, the heating film further includes a conductive circuit, and the conductive circuit is formed on the base layer and electrically connected to the heating circuit.

[0019] In one embodiment, at least a part of the conductive circuit is located between the base layer and the second infrared layer.

[0020] In one embodiment, the base layer is provided with an electrical connection hole, and the conductive circuit passes through the electrical connection hole and forms an electrical connection point on a side of the base layer away from the second infrared layer.

[0021] In one embodiment, the first infrared layer and the second infrared layer are made of the same material, and at least one end face of the metal matrix is covered with the first infrared layer or the second infrared layer.

[0022] An aerosol generating device includes the above heating tube.

[0023] For the above heating tube, on the one hand, infrared layers are provided on both the inner sidewall and the outer sidewall of the metal matrix, which can play a role in protecting the metal matrix, prevent the heating tube from short-circuiting, and can also simplify the forming process of the heating tube. When coating one sidewall of the metal matrix, there is no need to specially protect the other sidewall. On the other hand, the infrared layers covering both sides of the metal matrix can also effectively prevent the metal matrix from corroding and rusting during long-term use, thereby extending the service life of the aerosol generating device provided with the heating tube and improving the safety performance of the aerosol generating device. Description of the Drawings

[0024] Figure 1 Structural schematic diagram of a heating tube according to an embodiment of the present application;

[0025] Figure 2 is Figure 1 Cross-sectional view of the heating tube shown;

[0026] Figure 3 is Figure 2 Partial enlarged view of part A of the heating tube shown;

[0027] Figure 4 is Figure 1 Schematic diagram of the heating circuit of the heating tube shown.

[0028] Explanation of reference numerals:

[0029] 100, heating tube; 110, metal substrate; 120, first insulating layer; 130, first infrared layer; 140, second insulating layer; 150, second infrared layer; 161, base layer; 162, heating circuit; 1631, first conductive circuit; 1632, second conductive circuit; 170, wire. Detailed implementation manners

[0030] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0032] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise clearly stipulated and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In this application, unless otherwise clearly stipulated and defined, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for illustrative purposes and do not represent the only implementation.

[0036] An embodiment of this application provides an aerosol generating device (not shown in the figure), and the aerosol generating device is used to heat an aerosol generating substrate to generate an aerosol for user use. The aerosol generating substrate can be formed by solid materials in the form of powder, granule, strip or sheet, etc., including but not limited to solid materials for medical, health preservation, health, beauty purposes, such as the roots, stems, leaves, flowers, buds, seeds of plants, etc.

[0037] As shown Figure 1 in the figure, the aerosol generating device includes a heating tube 100 and a battery assembly (not shown in the figure) disposed on one side of the heating tube 100. The aerosol generating substrate can be inserted into the heating tube 100. The battery assembly is electrically connected to the heating tube 100. The heating tube 100 can generate heat under the action of the electric energy of the battery assembly. The heat generated by the heating tube 100 can be conducted to the aerosol generating substrate, and the aerosol generating substrate is heated to generate aerosol.

[0038] Specifically, the heating tube 100 is a multi-layer structure, including a metal matrix 110, a first infrared layer 130, a second infrared layer 150, and a heating film that are stacked.

[0039] Among them, the metal matrix 110 has a hollow cylindrical structure with openings at both ends. The first infrared layer 130 at least partially covers the inner side wall of the metal matrix 110, and the second infrared layer 150 at least partially covers the outer side wall of the metal matrix 110. The heating film is disposed on the surface of the second infrared layer 150 facing away from the metal matrix 110. The heating film is used to generate heat when energized and sequentially heats the second infrared layer 150, the metal matrix 110, and the first infrared layer 130, and finally heats the aerosol generating substrate.

[0040] In this way, on the one hand, infrared layers are provided on both the inner side wall and the outer side wall of the metal matrix 110, which can play a role in protecting the metal matrix 110, prevent the heating tube 100 from short-circuiting, and can also simplify the forming process of the heating tube 100. When coating a film on one side wall of the metal matrix 110, especially the dip coating process, there is no need to provide additional protection for the other side wall. On the other hand, covering infrared layers on both sides of the metal matrix 110 can also effectively prevent the metal matrix 110 from corroding and rusting during long-term use, thereby extending the service life of the aerosol generating device provided with the heating tube 100 and improving the safety performance of the aerosol generating device.

[0041] As a preferred embodiment, the materials of the first infrared layer 130 and the second infrared layer 150 are the same, which is convenient for forming by the dip coating process. In addition, at least one end face of the metal matrix 110 can also be covered with the first infrared layer 130 or the second infrared layer 150, thereby further simplifying the forming process of the heating tube 100 and providing more comprehensive protection for the metal matrix 110.

[0042] In some embodiments, the heating tube 100 further includes a first insulating layer 120 and a second insulating layer 140. The first insulating layer 120 is disposed on the inner sidewall of the metal substrate 110 and is located between the metal substrate 110 and the first infrared layer 130. The second insulating layer 120 is disposed on the outer sidewall of the metal substrate 110 and is located between the metal substrate 110 and the second infrared layer 150. Thus, the first insulating layer 120 and the second insulating layer 140 are respectively disposed on the inner and outer sidewalls of the metal substrate 110, thereby playing a role in further protecting the metal substrate 110.

[0043] As a preferred embodiment, the first insulating layer 120 and the second insulating layer 140 are formed of the same material, and at least one end face of the metal substrate 110 is covered with the first insulating layer 120 and the second insulating layer 140. Therefore, a more comprehensive insulation protection effect can be achieved. Insulating layers are provided on both sides, which also further simplifies the forming process.

[0044] Please continue to refer to Figure 1 and Figure 2 , the metal substrate 110 is a circular tubular structure with a circular cross-section, and the metal substrate 110 can be formed of a metal material. It can be understood that the shape of the metal substrate 110 is not limited to this, and it can be set as needed to meet different requirements.

[0045] Specifically, in some embodiments, the metal substrate 110 can be formed of a stainless steel material. The stainless steel material has high corrosion resistance, heat resistance, good mechanical properties and is easy to process. As a preferred embodiment, the metal substrate 110 is formed of 430 stainless steel or 316L stainless steel. It can be understood that the material forming the metal substrate 110 is not limited to this, and the material forming the metal substrate 110 can be only one kind or a mixture of multiple materials, and different materials can be used as needed to meet different requirements.

[0046] The first insulating layer 120 completely covers the inner sidewall of the metal substrate 110. The first insulating layer 120 is formed of a glass material, and the thickness of the first insulating layer 120 is 10μm - 50μm (including the end point values), preferably 20μm - 30μm (including the end point values). Specifically, in one embodiment, the first insulating layer 120 uses a slurry prepared from a Si - Al - Ca - Ba - Zn - B - Zr system with a viscosity of 20pa.s - 120pa.s, and is adhered to the inner sidewall of the metal substrate 110 by dip coating and sintered at a temperature of 800℃ - 860℃. It can be understood that the material forming the first insulating layer 120 and the forming method of the first insulating layer 120 are not limited to this, so as to meet different insulation requirements.

[0047] The first infrared layer 130 completely covers the surface of the first insulating layer 120 facing away from the metal matrix 110 to form the inner wall of the entire heating tube 100. The first infrared layer 130 is formed of an infrared high-radiation material, and the infrared radiation rate in the 2μm - 11μm band is greater than or equal to 50%. The thickness of the first infrared layer 130 is 10um - 200um (including the end values), preferably 15um - 30um (including the end values). Specifically, in one embodiment, the first infrared layer 130 is prepared on the first insulating layer 120 by the method of dip coating and sintering. The infrared high-radiation material includes any one or more of Fe2O3, MnO2, Co2O3, ZrO2, SiO2, SiC, TiO2, Al2O3, CeO2, La2O3, MgO, cordierite, and perovskite. It can be understood that the material forming the first infrared layer 130 and the forming method of the first infrared layer 130 are not limited thereto and can be set as needed.

[0048] The second insulating layer 140 completely covers the outer side wall of the metal matrix 110. The second insulating layer 140 is formed of a glass material. The thickness of the second insulating layer 140 is 10μm - 50μm (including the end values), preferably 20μm - 30μm (including the end values). Specifically, in one embodiment, the second insulating layer 140 uses a slurry with a viscosity of 20pa.s - 120pa.s prepared by the Si-Al-Ca-Ba-Zn-B-Zr system, adheres to the outer side wall of the metal matrix 110 through the dip coating process, and is sintered at a temperature of 800°C - 860°C to form. It can be understood that the material forming the second insulating layer 140 and the forming method of the second insulating layer 140 are not limited thereto, so as to meet different insulation requirements.

[0049] The second infrared layer 150 completely covers the surface of the second insulating layer 140 facing away from the metal matrix 110. The second infrared layer 150 is formed of an infrared high-radiation material. The thickness of the second infrared layer 150 is 10um - 200um (including the end values), preferably 15um - 30um (including the end values). Specifically, in one embodiment, the second infrared layer 150 is prepared on the second insulating layer 140 by the method of dip coating and sintering. The infrared high-radiation material includes any one or more of Fe2O3, MnO2, Co2O3, ZrO2, SiO2, SiC, TiO2, Al2O3, CeO2, La2O3, MgO, cordierite, and perovskite. It can be understood that the material forming the second infrared layer 150 and the forming method of the second infrared layer 150 are not limited thereto and can be set as needed.

[0050] It can be understood that the first insulating layer 120 and the second insulating layer 140 can be simultaneously formed on the inner and outer wall surfaces of the metal matrix 110 by dip coating process respectively, and the first infrared layer 130 and the second infrared layer 150 can be simultaneously formed on the outer surfaces of the first insulating layer 120 and the second insulating layer 140 by dip coating process respectively, which simplifies the forming process and can also form a comprehensive protection for the metal matrix 110.

[0051] The heating film is wound around the outer surface of the second infrared layer 150 away from the second insulating layer 140. The heating film is electrically connected to the battery assembly. The heating film can generate heat under the action of the electric energy of the battery assembly. The heat generated by the heating film is conducted to the aerosol generating matrix in the heating tube 100 through the second infrared layer 150, the second insulating layer 140, the metal matrix 110, the first insulating layer 120 and the second infrared layer 150 in sequence.

[0052] In some embodiments, the heating film includes a base layer 161 and a heating circuit 162. The base layer 161 is disposed on the second infrared layer 150. The heating circuit 162 is formed on the base layer 161 and is located between the base layer 161 and the second infrared layer 150.

[0053] Specifically, the base layer 161 is a cast film formed by a glass material or a ceramic material through a casting process. The thickness of the base layer 161 is preferably 100μm - 120μm (including the end values). Specifically, in one embodiment, the base layer 161 is formed by a Si - Al - Ca - Na - K - B system material through a casting process. It can be understood that the material and thickness of the base layer 161 are not limited to this, and can be set according to needs to meet different requirements.

[0054] The heating circuit 162 is formed on the surface of the base layer 161 close to the second infrared layer 150 by printing or other means. The heating circuit 162 bends and extends on the base layer 161 to form a preset pattern. The material for forming the heating circuit 162 includes one or more of silver, silver - palladium alloy, platinum, nickel and tungsten. Preferably, the heating circuit 162 is formed of a silver - palladium alloy material. It can be understood that the material for forming the heating circuit 162 and the pattern of the heating circuit 162 are not limited, and can be set according to needs to meet different atomization requirements.

[0055] In some embodiments, the heating circuit 162 has a plurality of heating segments, and the plurality of heating segments are arranged in sequence along the axial direction of the heating tube 100, so as to heat different positions of the aerosol generating matrix respectively to achieve a better atomization effect.

[0056] In some embodiments, the heating film further includes a conductive circuit formed on the base layer 161. The conductive circuit is at least partially located between the base layer 161 and the second infrared layer 150 and is used to electrically connect the heating circuit 162 and the battery assembly. Further, the base layer 161 is provided with an electrical connection hole penetrating in its own thickness direction. The conductive circuit passes through the electrical connection hole and forms an electrical connection point on the side of the base layer 161 away from the second infrared layer 150.

[0057] Specifically, the conductive circuit includes a first conductive circuit 1631 and a second conductive circuit 1632. The first conductive circuit 1631 is formed on the surface of the base layer 161 close to the second infrared layer 150 and is electrically connected to the heating circuit 162. The first conductive circuit 1631 is formed of an Ag-based material, and the thickness of the first conductive circuit 1631 is 8μm - 20μm (including the end values), preferably 10μm - 15μm (including the end values). It can be understood that the material for forming the first conductive circuit 1631 and the shape of the first conductive circuit 1631 are not limited and can be set as needed to meet different electrical connection requirements.

[0058] One end of the second conductive circuit 1632 is connected to the first conductive circuit 1631, and the other end of the second conductive circuit 1632 passes through the electrical connection hole to form an electrical connection point on the surface of the base layer 161 away from the second infrared layer 150. The second conductive circuit 1632 is formed of an Ag-based material, and the thickness of the second conductive circuit 1632 is 8μm - 20μm (including the end values), preferably 10μm - 15μm (including the end values). It can be understood that the material for forming the second conductive circuit 1632 and the shape of the second conductive circuit 1632 are not limited and can be set as needed to meet different electrical connection requirements.

[0059] As a preferred embodiment, the length of the first conductive circuit 1631 is longer than that of the second conductive circuit 1632 to facilitate the connection of the heating circuit 162, and the pattern formed by the first conductive circuit 1631 is adapted to the shape of the heating circuit 162. The second conductive circuit 1632 forms a rectangular or circular pattern as the electrical connection point, and the area of the electrical connection point is 1mm 2 - 10mm 2 (including the end values), preferably 2mm 2 - 4mm 2 (including the end values).

[0060] In some embodiments, the preparation process of the heating film is as follows:

[0061] First, a casting film is formed by using a Si-Al-Ca-Na-K-B system material through a casting process. Then, electrical connection holes are opened at corresponding positions on the casting film. Subsequently, a first conductive circuit 1631 and a heating circuit 162 are printed on one surface of the casting film, and a second conductive circuit 1632 and the heating circuit 162 are printed on the other surface of the casting film.

[0062] After that, the casting film printed with the first conductive circuit 1631, the heating circuit 162, and the second conductive circuit 1632 is cut into a rectangle to form a heating film. The length of the cut casting film is the same as the height of the heating tube 100. The width of the casting film is longer than the circumference of the heating tube 100, and the difference between them is 0.2 mm - 2 mm (including the end values), preferably the difference is 0.5 mm - 1 mm (including the end values).

[0063] Finally, the heating film is wound circumferentially around the metal substrate 110 formed with the first infrared layer 130, the second infrared layer 150, the first insulating layer 120, and the second insulating layer 140, and finally sintered and formed at a temperature of 800°C - 860°C.

[0064] In some embodiments, the heating tube 100 further includes a wire 170. One end of the wire 170 is electrically connected to the electrical connection point formed with the second conductive circuit 1632 by soldering, brazing, or sintering with a conductive paste. The other end of the wire 170 is electrically connected to the battery assembly. It can be understood that the connection method between the wire 170 and the second conductive circuit 1632 is not limited to this, and can be set according to needs to meet different connection requirements.

[0065] For the above heating tube 100 and the aerosol generating device provided with it, the first infrared layer 130 and the second infrared layer 150 are respectively provided on the inner and outer side walls of the heating tube 100, which can not only increase the insulation performance between the heating circuit 162 and the metal substrate 110, but also prevent the metal substrate 110 from corroding and rusting during long-term use. Moreover, by providing the first insulating layer 120 between the first infrared layer 130 and the metal substrate 110, and the second insulating layer 140 between the second infrared layer 150 and the metal substrate 110, the insulation performance between the heating circuit 162 and the metal substrate 110 can be further increased, and the metal substrate 110 can be further prevented from corroding and rusting during long-term use, thereby significantly improving the service life of the aerosol generating device and facilitating the further popularization and application of the aerosol generating device.

[0066] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0067] The embodiments described above only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A heating tube, characterized in that, The heating tube includes: A metal substrate, having a hollow cylindrical structure with open ends at both ends; A first infrared layer, at least partially covering the inner sidewall of the metal substrate; A second infrared layer, at least partially covering the outer sidewall of the metal substrate; A heating film, disposed on a surface of the second infrared layer facing away from the metal substrate, and the heating film is used to generate heat when powered on and heat the second infrared layer, the metal substrate, and the first infrared layer.

2. The heating pipe according to claim 1, characterized in that, The heating tube further includes: A first insulating layer, disposed on the inner sidewall of the metal substrate and located between the metal substrate and the first infrared layer; A second insulating layer, disposed on the outer sidewall of the metal substrate and located between the metal substrate and the second infrared layer.

3. The heating tube according to claim 2, wherein The first insulating layer and the second insulating layer are formed of the same material.

4. The heating tube according to claim 2, characterized in that, At least one end face of the metal substrate is covered with the first insulating layer and the second insulating layer; and / or at least one end face of the metal substrate is covered with the first infrared layer or the second infrared layer.

5. The heating tube according to claim 1, characterized in that, The heating film includes: A base layer, disposed on the second infrared layer; A heating circuit, formed on the base layer and located between the base layer and the second infrared layer.

6. The heating tube according to claim 5, characterized in that, The heating film further includes a conductive circuit, and the conductive circuit is formed on the base layer and electrically connected to the heating circuit.

7. The heating tube according to claim 6, characterized in that, At least a part of the conductive circuit is located between the base layer and the second infrared layer.

8. The heating pipe according to claim 7, characterized in that, The base layer is provided with an electrical connection hole, and the conductive circuit passes through the electrical connection hole and forms an electrical connection point on a side of the base layer away from the second infrared layer.

9. The heating tube according to claim 1, wherein The materials of the first infrared layer and the second infrared layer are the same, and at least one end face of the metal substrate is covered with the first infrared layer or the second infrared layer.

10. An aerosol generating device, characterized in that, Including the heating tube according to any one of claims 1 to 9.

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