WO2020037852A1

WO2020037852A1 - Heating body and manufacturing method therefor, and aerosol generation apparatus

Info

Publication number: WO2020037852A1
Application number: PCT/CN2018/116519
Authority: WO
Inventors: 刘德文
Original assignee: 威滔电子科技（深圳）有限公司
Priority date: 2018-08-21
Filing date: 2018-11-20
Publication date: 2020-02-27
Also published as: CN108903062A

Abstract

Provided are a heating body and a manufacturing method therefor, and an aerosol generation apparatus. The heating body comprises a metal inner pipe (10) with an outer surface thereof being subjected to an insulating treatment, and a heating element body (20) sleeved on the outer surface of the metal inner pipe (10), wherein the heating element body (20) is in a tubular shape, and the heating element body (20) is in interference fit with the metal inner pipe (10). The heating element body (20) is fixed to the outer wall of the metal inner pipe (10) in such a way that it is in an interference fit with the metal inner pipe (10), so that the heating element body (20) can be in close contact with the metal inner pipe (10), so as to ensure sufficient heat conduction efficiency. When in use, the heating element body (20) and the metal inner pipe (10) are heated and expand at the same time, and are kept in close contact all the time; moreover, the tubular heating element body (20) is used, so that the resistance value of the heating element body can be accurately controlled during production, and the precision and consistency of the heating body are improved.

Description

Heating element, manufacturing method thereof and aerosol generating device

Technical field

The invention relates to the technical field of electronic cigarettes, and more particularly, to a heating element, a manufacturing method thereof, and an aerosol generating device.

Background technique

The heating body used in the existing electric heating aerosol generating device generally adopts a ceramic substrate, and then covers the ceramic substrate with a layer of resistance heating element, wherein the resistance heating element is printed on the surface of the ceramic substrate, and then After the high temperature process, the resistance heating element is solidified on the surface of the ceramic substrate.

Alternatively, the existing heating body is wound with a heating wire around the outer surface of an insulated metal pipe, or a PI film printed with a heating element is sleeved on the metal pipe or ceramic pipe, or the outer surface of a ceramic cup, so that the heating wire or PI The membrane is fixed with a metal tube or a ceramic tube, and a ceramic cup is fixed.

technical problem

The technical problem to be solved by the present invention is to provide a heating element, a manufacturing method thereof, and an aerosol generating device in response to the foregoing defects of the prior art.

Technical solutions

The technical solution adopted by the present invention to solve its technical problems is to construct a heating element, including a metal inner tube whose outer surface is insulated, and a heating element body sleeved on the outer surface of the metal inner tube;

The heating element body has a tubular shape, and the heating element body and the metal inner tube are interference fit.

Preferably, the metal inner tube has a hollow structure.

Preferably, the inner diameter of the heating element body is smaller than the outer diameter of the metal inner tube.

Preferably, the heating element body has a hollow structure.

Preferably, the heating element body includes at least one section of the heating element body.

Preferably, the first-stage heating element body and the second-stage heating element body, the first-stage heating element body and the second-stage heating element body are sleeved on the outer surface of the metal inner tube separately.

Preferably, one end of each segment of the heating element body is provided with a lead wire for connecting the heating element body to an external power supply circuit.

Preferably, the heating element body is a stainless steel heating element body.

Preferably, it further comprises an insulating layer covering the outer surface of the body of the heating element.

The invention also provides a method for manufacturing a heating element, which includes the following steps:

S1. Etching a stainless steel tube according to a preset pattern to obtain a tubular heating element body; an inner diameter of the stainless steel tube is smaller than an outer diameter of a metal inner tube;

S2. Preheating the tubular heating element body to increase the inner diameter of the tubular heating element body;

S3. Sleeve the preheated tubular heating element body into an outer wall of a metal inner tube in a low temperature state;

S4. Cooling at room temperature, so that the tubular heating element body is sleeved on the periphery of the metal inner tube;

S5. An insulating layer is coated on the outer surface of the tubular heating element body and cured.

The invention also provides an aerosol generating device, which includes the heating element described above and a power supply module electrically connected to the heating element.

Beneficial effect

The heating element embodying the present invention has the following beneficial effects: the heating element main body of the present invention and the metal inner tube are fixed to the outer wall of the metal inner tube in an interference fit manner, so that the heating element main body and the metal inner tube are in close contact, ensuring that With sufficient heat conduction efficiency, the heating element body and the metal inner tube heat up at the same time and expand while keeping the two in close contact. In addition, the tubular heating element body is used to accurately control the resistance value of the heating element body during production, thereby improving the accuracy and consistency of the heating element.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described below with reference to the accompanying drawings and embodiments. In the drawings:

1 is a schematic structural diagram of a first embodiment of a heating element provided by the present invention;

2 is a schematic structural diagram of a second embodiment of a heating element provided by the present invention;

FIG. 3 is a schematic flowchart of a method for manufacturing a heating element provided by the present invention.

Best Mode of the Invention

In order to have a clearer understanding of the technical features, objects, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, it is a schematic structural diagram of a first embodiment of a heating element provided by the present invention.

In this embodiment, a metal inner tube 10 with an insulation treatment on the outer surface of the heat generating body, and a heat generating element body 20 sleeved on the outer surface of the metal inner tube 10.

By adopting a metal inner tube 10 whose outer surface is subjected to insulation treatment, the metal inner tube 10 can be insulated from the heating element body 20 sleeved on the outer surface thereof. Wherein, the metal inner pipe 10 may be any metal pipe, and the material of the metal inner pipe 10 is not limited in the present invention. The metal inner tube 10 is mainly used for supporting. The use of the metal inner tube 10 as a support for a heating element can enhance the strength and hardness of the heating element.

Further, the metal inner tube 10 has a hollow structure. By using the metal inner tube 10 with a hollow structure as a support of the heating element, the heat dissipation rate of the heating element can also be improved.

The inner diameter of the metal inner tube 10 is based on the size of the smoking article to be inserted therein, that is, the inner diameter of the metal inner tube 10 is based on the smoking product can be accommodated therein. Among them, the smoking article may be a cigarette or the like. Therefore, the inner diameter of the metal inner tube 10 is adapted to the outer diameter of the cigarette so that the cigarette product can be just inserted into it.

The heating element body 20 has a tubular shape, and the heating element body 20 and the metal inner tube 10 are interference fit. Specifically, the heating element body 20 is a tubular heating element body 20, which is an integrally molded structure.

Optionally, the heating element body 20 is a stainless steel heating element body. Among them, 316L series stainless steel pipes are preferred. Of course, in other embodiments, the heating element body 20 is not limited to a stainless steel material, and other heating materials may also be used.

Further, the inner diameter of the heating element body 20 is smaller than the outer diameter of the metal inner tube 10. The inner diameter of the tubular heating element body 20 is slightly smaller than the outer diameter of the metal inner tube 10, so that the heating element body 20 can achieve an interference fit with the metal inner tube 10. Preferably, the interference fit tolerance of the heating element body 20 and the metal inner tube 10 is P7 / h6. Of course, it can be understood that, in other embodiments, the interference fit tolerance of the heating element body 20 and the metal inner tube 10 may also be adopted, which is not limited to the interference fit tolerance of P7 / h6.

Further, the heating element body 20 has a hollow structure.

The stainless steel heating element body 20 is described. The molding process of the heating element body 20 is: according to the design requirements, first take an appropriate amount of stainless steel tube, and then use laser cutting, corrosion or precision stamping to perform the stainless steel tube according to a preset pattern. Etching to obtain a corresponding hollow stainless steel tube, which is the tubular heating element body 20 of the present invention.

By using an integrally formed stainless steel tube as the heating element, the physical properties of the heating element body 20 can be made more stable, the resistivity and temperature variation coefficient are more stable, and the uniformity is better. The heating element body 20 can be controlled more accurately during production The resistance value and temperature effectively improve the accuracy and consistency of the heating element.

Further, as shown in FIG. 1, the heating element body 20 is provided with a plurality of sets of notches 201 along the axial direction, and each set of notches 201 includes two notches 201 disposed symmetrically. That is, each set of notches 201 is provided with two notches 201, and the two notches 201 have the same shape and size, and are arranged symmetrically along the circumferential direction of the heating element body 20.

Optionally, two adjacent sets of notches 201 in the plurality of sets of notches 201 are staggered in the circumferential direction. As shown in FIG. 1, in the plurality of sets of notches 201, two adjacent sets of notches 201 are staggered in the circumferential direction to form a plurality of smaller width regions. These smaller width regions are the heating regions of the heating element body 20. The number of stages of the notch 201 can be determined according to the calorific value. The size of the notch 201 can also be determined based on the calorific value. That is, the shape and size of the hollow pattern can be determined according to the calorific value. The invention does not specifically limit this .

Further, as shown in FIG. 1, a lead 202 is provided at each end of the heating element body 20, and each pin can be fixed to both ends of the heating element body 20 by bump welding. The length of the two leads 202 can be determined according to the needs of assembly, and the present invention is not specifically limited. By providing one lead 202 at each end of the heating element body 20, the heating element body 20 can be connected to an external power supply circuit through the two pins. The external power supply circuit may include a rechargeable battery or a disposable battery. Rechargeable batteries include, but are not limited to, lithium batteries and the like.

As shown in FIG. 1, the heating element body 20 includes a section of the heating element body 20, and the section of the heating element body 20 is sleeved along the axial direction of the metal inner tube 10 in the middle of the metal inner tube 10. Of course, in other embodiments, the section of the heating element body 20 may be sleeved at any other position of the metal inner tube 10 in the axial direction, and the present invention does not limit the position of the heating element body 20.

Further, the heating element body 20 further includes an insulating layer covering an outer surface of the heating element body 20. The insulating layer can be coated on the outer surface of the heating element body 20 by printing or coating. The insulating layer can fill the hollowed-out area of the heating element body 20. By covering the outer surface of the heating element body 20 with an insulating layer, unsafe problems such as a short circuit between the heating element body 20 and the outside during heating can be avoided, and the insulating layer completely covers the heating element body 20, It can play a good role in insulation, and effectively prevent the heating element body 20 from damaging the human body during the heating process.

Optionally, the insulating layer is a high temperature resistant insulating layer, preferably a ceramic glaze insulating layer or a plastic insulating layer. Of course, it can be understood that, in other embodiments, the insulating layer may also use other high-temperature-resistant materials, and is not limited to a ceramic glaze insulating layer or a plastic insulating layer.

As shown in FIG. 1, when the heating element is used, a smoking article can be inserted into the metal inner tube 10, and the heating element can be supplied with electricity through an external power supply circuit, so that the heating element body 20 in the heating element generates heat, The generated heat heats the smoking article, so that the smoking article generates a corresponding aerosol for the user to smoke.

Referring to FIG. 2, it is a schematic structural diagram of a second embodiment of a heating element provided by the present invention.

As shown in FIG. 2, in this embodiment, the inner surface of the heat-generating outer surface of the metal inner tube 10, the first heat-generating element body 20A and the second heat-generating element body 20B, the first heat-generating element body 20A, and the second heat-generating body. The element body 20B is sleeved on the outer surface of the metal inner tube 10 separately.

By using a metal inner tube 10 whose outer surface is subjected to insulation treatment, the metal inner tube 10 can be insulated from the first heating element body 20A and the second heating element body 20B sleeved on the outer surface thereof. Wherein, the metal inner pipe 10 may be any metal pipe, and the material of the metal inner pipe 10 is not limited in the present invention. The metal inner tube 10 is mainly used for supporting. The use of the metal inner tube 10 as a support for a heating element can enhance the strength and hardness of the heating element.

Further, the metal inner tube 10 has a hollow structure. By using the metal inner tube 10 with a hollow structure to act as a support of the heating element, the heat dissipation rate of the heating element can also be improved.

The first heating element body 20A and the second heating element body 20B are tubular, and the first heating element body 20A and the second heating element body 20B are interference fit with the metal inner tube 10. Specifically, the first heat-generating element body 20A and the second heat-generating element body 20B are tubular and have an integrated structure.

Optionally, the first heating element body 20A and the second heating element body 20B are both stainless steel heating element bodies. Among them, 316L series stainless steel pipes are preferred. Of course, in some other embodiments, the material is not limited to stainless steel, and other heat-generating materials may also be used.

Further, the inner diameters of the first heating element body 20A and the second heating element body 20B are smaller than the outer diameter of the metal inner tube 10. The inner diameter of the first heating element body 20A and the second heating element body 20B is slightly smaller than the outer diameter of the metal inner tube 10, so that the first heating element body 20A and the second heating element body 20B can reach the metal inner tube 10. The effect of interference fit. Preferably, the interference fit tolerance between the first heating element body 20A and the second heating element body 20B and the metal inner tube 10 is P7 / h6. Of course, it can be understood that in other embodiments, the first heating element body 20A and the second heating element body 20B and the metal inner tube 10 may also adopt other interference fit tolerances, and are not limited to the P7 / h6 Interference fit tolerance

Further, the first heating element body 20A and the second heating element body 20B have a hollow structure.

The molding process of the first heating element body 20A is the same as that of the second heating element body 20B.

The first heating element body 20A of stainless steel is described. The forming process of the first heating element body 20A is: according to the design requirements, first take a suitable amount of stainless steel tube, and then use laser cutting, corrosion or precision stamping according to the preset The stainless steel tube is etched in a pattern to obtain a corresponding hollow stainless steel tube. The hollow stainless steel tube is the tubular first heating element body 20A of the present invention. Similarly, the second heating element body 20B can also adopt the same manufacturing process.

By adopting an integrally formed stainless steel tube as the heating element, the physical properties of the first heating element body 20A and the second heating element body 20B can be more stable, the resistance value and temperature variation coefficient are more stable, and the uniformity is better. The resistance value and temperature of the first heating element body 20A and the second heating element body 20B are controlled more accurately, which effectively improves the accuracy and consistency of the heating element.

Further, as shown in FIG. 2, the first heating element body 20A and the second heating element body 20B are each provided with a plurality of sets of notches (201A, 201B) along the axial direction, and each set of notches includes two notches arranged symmetrically. That is, there are two notches in each group of notches, and the two notches are of the same shape and size, and are symmetrically arranged along the circumferential direction of the heating element body.

Optionally, adjacent two sets of notches in the multiple sets of notches (201A, 201B) are staggered in the circumferential direction. As shown in FIG. 2, in the multiple sets of notches (201A, 201B), the adjacent two sets of notches are staggered in the circumferential direction to form a plurality of smaller width regions. These smaller width regions are the heat generated by the heating element body. Area, where the number of gaps can be determined according to the amount of heat generated, and the size of the gap can also be determined according to the amount of heat generated .

As shown in FIG. 2, the distance between the first heating element body 20A and the second heating element body 20B needs to be determined according to the material of the metal inner tube 10. For example, when the metal inner tube 10 is an aluminum metal inner tube 10, since the aluminum metal inner tube 10 has a high heating efficiency, the distance between the first heating element body 20A and the second heating element body 20B needs to be more Longer. Of course, in some other embodiments, the heating element of the present invention may further be provided with three, four or more heating element bodies. When a plurality of heating element bodies are included, two adjacent heating element bodies are not in contact. In order to prevent interference between the heating element bodies of each section, and avoid short circuit between the heating element bodies.

Further, as shown in FIG. 2, a lead 202A is provided at each end of the first heating element body 20A, and a lead 202B is provided at each end of the second heating element body 20B. It is fixed at both ends of the heating element body. The lengths of the two leads of each of the first heating element body 20A and the second heating element body 20B can be determined according to the needs of assembly, and the present invention is not specifically limited. By providing one lead wire at each end of the first heating element body 20A and one lead wire at each end of the second heating element body 20B, the first heating element body 20A and the second heating element body 20B can be realized. Independent connection to external power circuits. The external power supply circuit may include a rechargeable battery or a disposable battery. Rechargeable batteries include, but are not limited to, lithium batteries and the like. Of course, it can be understood that when multiple sections of the heating element body are provided, one end is provided at each end of each section of the heating element body, so that each section of the heating element body can be independently conductively connected to the external power supply circuit, thereby realizing The temperature of the heating element body is controlled in stages, so that the smoking products built in the heating body can generate aerosol in stages.

Further, the first heating element body 20A and the second heating element body 20B further include an insulating layer covering the outer surfaces of the first heating element body 20A and the second heating element body 20B. The insulating layer may cover the outer surfaces of the first heating element body 20A and the second heating element body 20B by printing or coating. The insulating layer may fill the first heating element body 20A and the second heating element body. 20B cutout area. By covering the outer surfaces of the first heating element body 20A and the second heating element body 20B with an insulating layer, it is possible to avoid the occurrence of short circuits between the first heating element body 20A and the second heating element body 20B and the outside during the heating process. A safety problem arises, and at the same time, the insulating layer completely covers the first heating element body 20A and the second heating element body 20B, which can play a good insulating role and effectively avoid the first heating element body 20A and the second heating element body 20B is harmful to the human body during fever.

The invention adopts an interference fit between the heating element body and the metal inner tube to fix the outer wall of the metal inner tube in an interference fit, so that the heating element body can be in close contact with the metal inner tube, ensuring sufficient heat conduction efficiency, and the heating element body is used during use At the same time as the metal inner tube is heated up and expanded at the same time, the two are always kept in close contact. In addition, the tubular heating element body is used to accurately control the resistance value of the heating element body during production, thereby improving the accuracy and consistency of the heating element.

Further, the present invention also provides an aerosol generating device. The aerosol generating device includes the aforementioned heating element and a power supply module electrically connected to the heating element. The power supply module is electrically connected to the heating element through the aforementioned leads provided at both ends of the heating element body. The power supply module may be a rechargeable battery or a disposable battery. Rechargeable batteries include, but are not limited to, lithium batteries and the like.

Referring to FIG. 3, a method for manufacturing a heating element according to the present invention is provided. The manufacturing method of the heating element is used to manufacture the heating element of the foregoing embodiment.

As shown in FIG. 3, the manufacturing method of the heating element includes the following steps:

Step S1: Etching the stainless steel tube according to a preset pattern to obtain a tubular heating element body; the inner diameter of the stainless steel tube is smaller than the outer diameter of the metal inner tube.

Among them, the stainless steel pipe can be etched using, but not limited to, laser cutting, etching, or precision stamping. By using laser cutting, etching, or precision stamping to etch the stainless steel pipe according to a preset pattern, the required The hollow stainless steel tube is the tubular heating element body of the present invention.

Step S2: Pre-heat the tubular heating element body to increase the inner diameter of the tubular heating element body.

Step S3: The pre-heated tubular heating element body is sleeved on the outer wall of the metal inner tube in a low temperature state.

Step S4, cooling at room temperature, so that the tubular heating element body is sleeved on the periphery of the metal inner tube.

In step S5, an outer surface of the tubular heating element body is coated with an insulating layer and cured.

In step S5, the insulating layer may be cured on the outer surface of the tubular heating element body by a high temperature. Optionally, the insulating layer is a high temperature resistant insulating layer, preferably a ceramic glaze insulating layer or a plastic insulating layer. Of course, it can be understood that, in other embodiments, the insulating layer may also use other high-temperature-resistant materials, and is not limited to a ceramic glaze insulating layer or a plastic insulating layer.

In the present invention, a tubular heating element body having an inner diameter smaller than the outer diameter of a metal inner tube is first pre-heated during assembly, so that the hole in the tubular heating element body is enlarged, and then the metal is placed in a metal at a low temperature. The outer wall of the inner tube; when the tubular heating element body is cooled, it can be tightly wrapped around the outer wall of the metal inner tube, so as to achieve the effect of closely contacting the heating element body with the metal inner tube, ensuring sufficient heat conduction efficiency and consistency. During use, the heating element body and the metal inner tube simultaneously heat up and expand at the same time, always keeping the two in close contact. Further, the integrated heating element body can accurately control the resistance value of the heating element body during production, thereby improving the accuracy and consistency of the heating element.

The above embodiments are only for explaining the technical concept and characteristics of the present invention, and the purpose thereof is to enable persons familiar with the technology to understand the content of the present invention and implement it accordingly, and should not limit the protection scope of the present invention. Any equivalent changes and modifications made to the scope of the claims of the present invention shall all fall within the scope of the claims of the present invention.

It should be understood that those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes should fall within the protection scope of the appended claims of the present invention.

Claims

A heating element, comprising a metal inner tube whose outer surface is subjected to insulation treatment, and a heating element body sleeved on the outer surface of the metal inner tube;

The heating element body has a tubular shape, and the heating element body and the metal inner tube are interference fit.
The heating element according to claim 1, wherein the metal inner tube has a hollow structure.
The heating element according to claim 1, wherein an inner diameter of the heating element body is smaller than an outer diameter of the metal inner tube.
The heating element according to claim 1, wherein the heating element body has a hollow structure.
The heating element according to claim 1, wherein the heating element body comprises at least one section of a heating element body.
The heating element according to claim 5, wherein the heating element body comprises a first-stage heating element body and a second-stage heating element body, and the first-stage heating element body and the second-stage heating element body are separated Nested on the outer surface of the metal inner tube.
The heating element according to claim 5, wherein each end of each section of the heating element body is provided with a lead wire for connecting the heating element body to an external power supply circuit.
The heating element according to claim 1, wherein the heating element body is a stainless steel heating element body.
The heat generating body according to claim 1, further comprising an insulating layer covering an outer surface of the body of the heat generating element.
A method for manufacturing a heating element, comprising the following steps:

S1. Etching a stainless steel tube according to a preset pattern to obtain a tubular heating element body; an inner diameter of the stainless steel tube is smaller than an outer diameter of a metal inner tube;

S2. Preheating the tubular heating element body to increase the inner diameter of the tubular heating element body;

S3. Sleeve the preheated tubular heating element body into an outer wall of a metal inner tube in a low temperature state;

S4. Cooling at room temperature, so that the tubular heating element body is sleeved on the periphery of the metal inner tube;

S5. An insulating layer is coated on the outer surface of the tubular heating element body and cured.
An aerosol generating device, comprising a heating element according to any one of claims 1 to 9 and a power supply module electrically connected to the heating element.