Needle-shaped heating element and aerosol generator

Abstract

In the needle-shaped heating element (1) and aerosol generator, the heating element (1) includes an electrically conductive outer tube (11), a heating circuit (15) and a temperature measurement circuit installed inside the outer tube (11), and one pole of the heating circuit (15) and one pole of the temperature measurement circuit are both electrically conductively connected to the outer tube (11). By sharing one pole between the heating circuit (15) and the temperature measurement circuit, the number of electrode lead wires required for the heating element (1) can be reduced.

Description

[Technical Field]

[0001] The present invention relates to the field of atomization, and more particularly to a needle-shaped heating element and an aerosol generating device. [Background technology]

[0002] Non-combustion, heated electronic cigarettes, also known as low-temperature heated smoking devices, are aerosol-generating devices that use a low-temperature, non-combustion, heating method to heat an aerosol-generating substrate, such as tobacco leaves, to produce an inhalable vapor. Non-combustion, heated electronic cigarettes primarily heat the tobacco leaves by precisely controlling the temperature after the heating element is energized, allowing for the rapid release of tobacco leaf extract from the tobacco leaves under low-temperature conditions.

[0003] A conventional needle-shaped heating element typically includes a heating circuit for heating the aerosol-generating substrate after current generation and a temperature measurement circuit for measuring the temperature. Generally, the heating element has multiple electrode leads, and the number of electrode leads is large or the distance between the electrode leads is small. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention aims to solve is to provide a needle-shaped heating element that requires a small number of electrode lead wires, and an aerosol generating device that has such a needle-shaped heating element, in response to the above-mentioned drawbacks of the prior art. [Means for solving the problem]

[0005] The technical solutions adopted by the present invention to solve the technical problems are as follows:

[0006] The needle-shaped heating element includes an electrically conductive outer tube, a heating circuit and a temperature measuring circuit installed inside the outer tube, and one pole of each of the heating circuit and the temperature measuring circuit is electrically conductively connected to the outer tube.

[0007] In some embodiments, the heating circuit is fabricated using a metal PTC material.

[0008] In some embodiments, the temperature coefficient of resistance of the heating circuit is between 1500 and 3500 ppm.

[0009] In some embodiments, the temperature measurement circuit is fabricated using a metal PTC material, or the temperature measurement circuit employs a thermocouple structure.

[0010] In some embodiments, the heating element further comprises a first electrode lead conductively connected to the outer tube.

[0011] In some embodiments, the first electrode lead is welded to the outside of the bottom of the outer tube.

[0012] In some embodiments, the heating element further includes a needle fitted into the tip of the outer tube.

[0013] In some embodiments, one pole of each of the heating circuit and the temperature measuring circuit is crimped between the needle and the outer tube, thereby conducting with the outer tube.

[0014] In some embodiments, the needle includes a cylindrical fitting portion that fits within the outer tube, and a conical introduction portion that is connected to the top of the fitting portion.

[0015] In some embodiments, the heating element further includes an insulating rod disposed within the outer tube, the heating circuit and the temperature measurement circuit being wound around the outside of the insulating rod.

[0016] In some embodiments, the heating circuit is disposed on an outer layer of the temperature measuring circuit.

[0017] In some embodiments, an insulating layer is formed between the heating circuit and the temperature measuring circuit by dipping or spray coating.

[0018] In some embodiments, the heating element further includes a second electrode lead wire conductively connected to the other pole of the heating circuit, and a third electrode lead wire conductively connected to the other pole of the temperature measurement circuit.

[0019] In some embodiments, the material of the outer tube is a heat-resistant alloy or metal material.

[0020] In some embodiments, the interior of the outer tube is filled with a high temperature resistant insulating material, and the exterior is coated with a ceramic coating layer.

[0021] In some embodiments, the heating element further includes a base, and the lower end of the outer tube is inserted into the base.

[0022] In some embodiments, the base is made of a ceramic material.

[0023] In some embodiments, the lower end of the outer tube is welded to the base through a ceramic paint.

[0024] The present invention further provides an aerosol generating device including any of the heating elements described above. [Effects of the Invention]

[0025] The present invention has at least the following beneficial effects: One pole of each of the heating circuit and the temperature measurement circuit is electrically connected to the external tube. By sharing one pole between the heating circuit and the temperature measurement circuit, the number of electrode leads required for the heating element can be reduced.

[0026] The present invention will be further described below in combination with the drawings and examples. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic diagram of a three-dimensional structure of a heating element in some embodiments of the present invention. [Figure 2] FIG. 2 is a schematic diagram of the cross-sectional structure of the heating element shown in FIG. [Figure 3] FIG. 2 is a schematic diagram of an exploded structure of the heating element shown in FIG. [Figure 4] 1 is a schematic diagram of the three-dimensional structure of an aerosol generating device in some embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] In order to make the technical features, objects and effects of the present invention more clearly understood, specific embodiments of the present invention will be described in detail with reference to the drawings.

[0029] 1 to 3, a needle-shaped heating element 1 in some embodiments of the present invention may include an electrically conductive outer tube 11, a needle 12 fitted into the tip of the outer tube 11, an insulating rod 14 installed vertically within the outer tube 11, a heating circuit 15 and a temperature measurement circuit installed within the outer tube 11, each having one pole electrically conductively connected to the outer tube 11, a first electrode lead wire 17 electrically conductively connected to the outer tube 11, a second electrode lead wire 18 electrically conductively connected to the other pole of the heating circuit 15, a third electrode lead wire 19 electrically conductively connected to the other pole of the temperature measurement circuit, and a base 13 installed at the bottom of the outer tube 11. One pole of the heating circuit 15 and one pole of the temperature measurement circuit are electrically connected to the first electrode lead wire 17 by being electrically connected to the outer tube 11. By sharing one pole between the heating circuit 15 and the temperature measurement circuit, the number of electrode leads of the heating element can be reduced. Furthermore, since the first electrode lead wires 17 are drawn out from the outer tube 11, the distance between the electrode lead wires can be increased.

[0030] The insulating rod 14 can be manufactured using a high-temperature resistant insulating material, such as a high-temperature resistant insulating ceramic material. The insulating rod 14 may have a generally long cylindrical shape and may include a first section 141, a second section 142, and a third section 143 connected in this order from top to bottom. The diameter of the second section 142 is larger than the diameters of the first section 141 and the third section 143 and smaller than the inner diameter of the outer tube 11. The first section 141 can be fixed by being firmly fitted into the needle 12. Furthermore, a step surface formed between the first section 141 and the second section 142 can abut against the bottom surface of the needle 12. Furthermore, the third section 143 can be fixed by being firmly fitted into the base 13.

[0031] The heating circuit 15 and the temperature measurement circuit can be wound spirally around the outside of the second section 142 along the axial direction. The role of the heating circuit 15 is to heat the aerosol-generating substrate after being energized, and it can be manufactured using a metal PTC (Positive Temperature Coefficient) material. This material tends to have an increasing electrical resistance as the temperature rises. Depending on the user's requirements, the resistance temperature coefficient of the heating circuit 15 can be selected between 1500 and 3500 ppm. The temperature measurement circuit may be manufactured using a metal PTC material, or may have a thermocouple structure.

[0032] An interlayer structure can be used for the heating circuit 15 and the temperature measurement circuit. Specifically, the temperature measurement circuit is located on the inner layer, and the heating circuit 15 is located on the outer layer. During manufacturing, the temperature measurement circuit is first wrapped around and fixed to the insulating rod 14, and an insulating layer is formed by dipping or spray coating. After hardening by sintering, the heating circuit 15 is wrapped around it, and finally, the needle 12 at the tip and the base 13 at the bottom are fixed. The second electrode lead wire 18, which is welded to the bottom end of the heating circuit 15 for electrical conduction, and the third electrode lead wire 19, which is welded to the bottom end of the temperature measurement circuit for electrical conduction, are drawn out along the insulating rod 14.

[0033] The needle 12 can be manufactured using a heat-resistant alloy or a metal material (e.g., stainless steel, etc.). In some embodiments, the needle 12 can include an introduction portion 121 located at an upper portion and an insertion portion 122 located at a lower portion. The introduction portion 121 is conical in shape to facilitate insertion into the aerosol-generating substrate. The diameter of the large-diameter end of the introduction portion 121 matches the outer diameter of the external tube 11 and is larger than the outer diameter of the insertion portion 122. The insertion portion 122 is cylindrical in shape and is firmly inserted into the external tube 11. The stepped surface formed between the introduction portion 121 and the insertion portion 122 firmly abuts against the upper end surface of the external tube 11. The upper ends of the heating circuit 15 and the temperature measurement circuit are crimped by the introduction portion 121 of the needle 12 and the external tube 11, thereby establishing electrical conduction with the external tube 11 and further with the first electrode lead wire 17. The first electrode lead wire 17 is welded to the outer surface of the bottom of the outer tube 11 , thereby establishing electrical continuity with the outer tube 11 .

[0034] The outer tube 11 has a cylindrical shape and can be made of a heat-resistant alloy or metal material (e.g., stainless steel). The interior of the outer tube 11 is filled with a high-temperature resistant insulating material, and the exterior is coated with a ceramic coating layer. The base 13 can be a ceramic structural member and can be welded to the outer tube 11 using ceramic paint. A mounting slot 130 is formed in the ceiling surface of the base 13 so as to be recessed downward, and the outer tube 11 is fitted into the mounting slot 130. The bottom surface of the outer tube 11 can abut against the bottom surface of the mounting slot 130. In addition, an electrode hole 131 communicating with the mounting slot 130 is formed in the bottom surface of the base 13 so as to be recessed upward. There are at least three electrode holes 131, and a first electrode lead wire 17, a second electrode lead wire 18, and a third electrode lead wire 19 are inserted through the electrode holes 131, respectively.

[0035] As shown in Figure 4, an aerosol-generating device in some embodiments of the present invention may be substantially rectangular prism-shaped and includes a housing 2, a heating element 1 installed in the housing 2, and a battery installed in the housing 2 and electrically connected to the heating element 1. An aerosol-generating substrate 3 is insertable into the housing 2 from its tip. The upper end of the heating element 1 is inserted into the aerosol-generating substrate 3, and after heating by applying electricity, the aerosol-generating substrate 3 is baked to form a vapor that can be inhaled by a user. As can be understood, the aerosol-generating device is not limited to a rectangular prism-shaped device, and may be in any other shape, such as a cylindrical shape.

[0036] The first electrode lead wire 17 of the heating element 1 may be electrically connected to the positive electrode of the battery, and the second electrode lead wire 18 and the third electrode lead wire 19 of the heating element 1 may be electrically connected to the negative electrode of the battery, or the first electrode lead wire 17 of the heating element 1 may be electrically connected to the negative electrode of the battery, and the second electrode lead wire 18 and the third electrode lead wire 19 of the heating element 1 may be electrically connected to the positive electrode of the battery.

[0037] As can be understood, the above technical features can be used in any combination without limitation.

[0038] The above examples merely illustrate preferred embodiments of the present invention, and are described in relatively specific detail, but should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features and make slight modifications and improvements without departing from the concept of the present invention, and all of these fall within the scope of protection of the present invention. Therefore, all equivalent modifications and additions made within the scope of the claims of the present invention shall also fall within the scope of coverage of the claims of the present invention.

Claims

1. The device includes an electrically conductive outer tube (11), a heating circuit (15) and a temperature measuring circuit installed in the outer tube (11), and a first electrode lead wire (17) electrically conductively connected to the outer tube (11), wherein one pole of the heating circuit (15) and one pole of the temperature measuring circuit are both electrically conductively connected to the outer tube (11); The device further includes a base (13), a second electrode lead wire (18) conductively connected to the other pole of the heating circuit (15), and a third electrode lead wire (19) conductively connected to the other pole of the temperature measuring circuit, The lower end of the outer pipe (11) is inserted into the base (13), The base (13) has three electrode holes (131), A needle-shaped heating element characterized in that the first electrode lead wire (17), the second lead wire (18), and the third lead wire (19) are separately inserted into the three electrode holes (131).

2. 2. The heating element of claim 1, wherein the heating circuit (15) comprises a metal PTC material.

3. 3. The heating element according to claim 2, wherein the temperature coefficient of resistance of the heating circuit (15) is between 1500 and 3500 ppm.

4. The heating element of claim 1 , wherein the temperature measurement circuit includes a metal PTC material, or the temperature measurement circuit includes a thermocouple structure.

5. 2. The heating element according to claim 1, wherein the first electrode lead wire (17) is welded to the outside of the bottom of the outer tube (11).

6. 2. The heating element according to claim 1, further comprising a needle (12) fitted into the tip of the outer tube (11).

7. The heating element according to claim 6, characterized in that one pole of the heating circuit (15) and one pole of the temperature measurement circuit are both crimped between the needle (12) and the external tube (11) to be electrically connected to the external tube (11).

8. The heating element according to claim 6, characterized in that the needle (12) includes a columnar insertion portion (122) that is inserted into the outer tube (11) and a conical introduction portion (121) that is connected above the insertion portion (122).

9. The heating element according to claim 1, further comprising an insulating rod (14) installed within the outer tube (11), and the heating circuit (15) and the temperature measuring circuit are wound around the outside of the insulating rod (14).

10. 10. The heating element according to claim 9, wherein the heating circuit (15) is arranged on the outer layer of the temperature measuring circuit.

11. 11. The heating element according to claim 10, wherein an insulating layer is formed between the heating circuit (15) and the temperature measuring circuit by immersion or spray coating.

12. 12. The heating element according to claim 1, wherein the outer tube (11) is made of a heat-resistant alloy or a metal material.

13. The heating element according to any one of claims 1 to 11, characterized in that the inside of the outer tube (11) is filled with a high-temperature resistant insulating material and the outside is coated with a ceramic coating layer.

14. 12. The heating element according to claim 1, wherein the base (13) is made of a ceramic material.

15. The heating element according to any one of claims 1 to 11, characterized in that the lower end of the outer tube (11) is welded to the base (13) through ceramic paint.

16. An aerosol generating device comprising the heating element according to any one of claims 1 to 15.

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