Integrated electro-thermal conversion direct heating device for tobacco products and preparation method of integrated electro-thermal conversion direct heating device

Abstract

The invention discloses an integrated electro-thermal conversion direct heating device for a tobacco product and a preparation method of the integrated electro-thermal conversion direct heating device. The heating device is formed by combining an electric heating conversion element and an injection molding part through in-mold injection molding; the inner surface of the injection molding part and the inner surface of the electric heating conversion element are positioned on the same curved surface and form a through hole for accommodating a tobacco product; the two ends of the electric heating conversion element are exposed out of the outer surface of the injection molding part and used for being connected with external conductive pins. The tobacco shred section is surrounded through the through hole, and the tobacco product is directly and accurately heated, so that the temperature rise speed of the tobacco shred section is high, the heating efficiency is high, the heating effect can be achieved without too high temperature, and the situation that the surface of the tobacco product is burnt and the internal temperature of the tobacco shred section does not reach smoking is avoided; and the other end of the tobacco product extends out of the other end of the injection molding part to serve as a suction nozzle without scalding the nozzle. Besides, the heating device is high in plasticity, the two ends of the heating device can be connected with different structural forms, and the heating device can be flexibly changed according to tobacco products of different lengths, so that universality is good.

Description

Technical Field

[0001] The present application relates to the technical field of harmless smoking, and in particular to an integrated electrothermal conversion direct heating device for tobacco products and a preparation method thereof. Background Art

[0002] At present, there are usually two ways to heat tobacco products with smoking utensils. One way is: a metal sheet is set in the tobacco of the tobacco product, and the metal sheet in the tobacco is heated by electromagnetic induction technology to achieve heating of the tobacco product. However, the metal sheet is usually small in area, the heated area of ​​the tobacco is limited, the heating is not sufficient, and the corresponding smoking utensils can only use tobacco products with metal sheets.

[0003] Another way is to place the tobacco product in a heat-conducting shell surrounded by a heating material, transfer heat to the heat-conducting shell through the heating material, and heat the tobacco product in the heat-conducting shell, thereby indirectly heating the tobacco product. This requires a higher temperature when heating, the heat loss of the heating material is high, the heating speed of the tobacco product is slow, the temperature control of the heating material is lagging and inaccurate, and the mouthpiece of the tobacco product is hot. Summary of the invention

[0004] The purpose of this application is to provide an integrated electric heat conversion direct heating device for tobacco products and a preparation method thereof, so as to solve the technical problems existing in the prior art such as insufficient heating of shredded tobacco, slow heating speed, hot mouthpiece, high heat loss, etc. The various technical effects that can be produced by the optional technical solutions among the various technical solutions provided in this application are described in detail below.

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] In a first aspect, the present application provides an integrated electrothermal conversion direct heating device for tobacco products, wherein the integrated electrothermal conversion direct heating device is configured to heat tobacco products to generate aerosol, and the integrated electrothermal conversion direct heating device comprises an electrothermal conversion element and an injection molded part, wherein the integrated electrothermal conversion direct heating device is a combination of the electrothermal conversion element and the injection molded part by in-mold injection, and the injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process; the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating the tobacco product; both ends of the electrothermal conversion element are exposed on the outer surface of the injection molded part, and are used to connect external conductive pins;

[0007] The injection molded part is a hollow structure, one end of the tobacco product is inserted from one end of the injection molded part and passes through the through hole; the other end of the tobacco product extends from the other end of the injection molded part; and the tobacco product is directly heated by the electrothermal conversion element.

[0008] In some embodiments, the injection-molded part has one or more hollow cavities for partially exposing the electrothermal conversion element; the outer surface of the injection-molded part is wrapped with thermal insulation cotton, and the thermal insulation cotton and the hollow cavity form an air insulation chamber.

[0009] In some embodiments, the outer surfaces of both ends of the injection molded part are provided with limit platforms, the hollow cavity is located between the two limit platforms, and the thermal insulation cotton is wrapped between the two limit platforms.

[0010] In some embodiments, the electrothermal conversion element includes one or more turns of a spiral coil, and the inner surface of the spiral coil is on the same curved surface as the inner surface of the injection-molded part; the injection-molded part is combined with the spiral coil by in-mold molding, and the spiral coil is fixed after in-mold injection molding, and a distance is maintained between two adjacent spiral coils, and the outer surface of the spiral coil is partially exposed in the hollow cavity formed by the injection-molded part.

[0011] In some embodiments, the spiral coil is in the shape of a circle or a racetrack circle, so that the through hole is in the shape of a cylindrical hole or a racetrack cylindrical hole.

[0012] In some embodiments, when the through hole is shaped as a racetrack cylindrical hole, the length of a line connecting two bends of the racetrack cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product, and the length of a line connecting two straight lines of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.

[0013] In some embodiments, the depth of the through hole is less than or equal to the length of the tobacco product. In some embodiments, the inner surface of the electrothermal conversion element forms a hollow channel, and the length of the hollow channel matches the length of the tobacco shreds of the tobacco product.

[0014] In a second aspect, the present application provides a method for preparing an integrated electrothermal conversion direct heating device for tobacco products, comprising:

[0015] Select a strip plate or a round tube plate made of alloy material to make an electrothermal conversion element whose inner surface is on the same curved surface;

[0016] A mold is made according to the shape and size of the heating device; the heating device includes an electrothermal conversion element and an injection molded part, the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, forming a through hole for accommodating tobacco products;

[0017] The electrothermal conversion element is fixed in the mold cavity of the mold, and plastic is injected into the mold cavity by an injection molding machine so that the electrothermal conversion element and the plastic are combined in the mold cavity. The injection molded part is formed during the injection molding process and a through hole for accommodating the tobacco product is formed, and the obtained heating device is taken out from the mold cavity;

[0018] Electrode pins are welded to the two ends of the electrothermal conversion element exposed on the outer surface of the heating device to obtain an integrated electrothermal conversion direct heating device.

[0019] In some embodiments, the injection molded part has more than one hollow cavity for partially exposing the electrothermal conversion element; after obtaining the integrated electrothermal conversion direct heating device, the preparation method further includes:

[0020] The outer surface of the injection molded part is wrapped with thermal insulation cotton so that the thermal insulation cotton and the hollow cavity form an air insulation chamber.

[0021] Implementing one of the above technical solutions of the present application has the following advantages or beneficial effects: an integrated electrothermal conversion direct heating device for tobacco products and a preparation method thereof, wherein the heating device includes an electrothermal conversion element and an injection molded part, the electrothermal conversion element and the injection molded part are combined by in-mold injection molding, the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating tobacco products, which can surround the tobacco shreds of the tobacco products, directly and accurately heat the tobacco products, so that the heating speed of the tobacco shreds is fast, the heating efficiency is high, and the heating effect can be achieved without excessively high temperatures, so as to avoid the surface of the tobacco products from being burnt while the internal temperature of the tobacco shreds has not reached the suction condition; and the other end of the tobacco product extends from the other end of the injection molded part as a nozzle and will not burn the mouth. In addition, the heating device has strong plasticity, and the two ends can be connected to different structural forms, and can be flexibly changed according to tobacco products of different lengths, so that it has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. It is obvious that the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a schematic structural diagram of an integrated electrothermal conversion direct heating device for tobacco products involved in an embodiment of the present application;

[0024] Figure 2 is an exploded view of the integrated electrothermal conversion direct heating device for tobacco products involved in the embodiment of the present application after being inserted into the tobacco product;

[0025] Figure 3 is a first structural diagram of an injection molded part involved in an embodiment of the present application;

[0026] Figure 4 is a cross-sectional view of the integrated electrothermal conversion direct heating device for tobacco products involved in the embodiment of the present application after being inserted into the tobacco product;

[0027] Figure 5 It is a schematic structural diagram of the integrated electrothermal conversion direct heating device for tobacco products involved in the embodiment of the present application without being wrapped with thermal insulation cotton;

[0028] Figure 6 is a structural schematic diagram of an electrothermal conversion element involved in an embodiment of the present application including a plurality of coils;

[0029] Figure 7 is another structural schematic diagram of an electrothermal conversion element according to an embodiment of the present application including a plurality of coils;

[0030] Figure 8 It is a schematic flow chart of a method for preparing an integrated electrothermal conversion direct heating device for tobacco products involved in an embodiment of the present application;

[0031] In the figure: 1. integrated electrothermal conversion direct heating device; 2. tobacco products; 3. conductive pins; 4. temperature sensor; 11. injection molded parts; 12. electrothermal conversion elements; 13. thermal insulation cotton; 14. through holes; 21. first end sponge segment; 22. tobacco segment; 23. second end sponge segment; 41. pins of temperature sensor; 111. hollow cavity; 112. limit table; 113. thermal insulation area; 121. spiral coil; 122. spacing; 123. hollow channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein various exemplary embodiments that may be used to implement the present application are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods, and devices that are consistent with some aspects disclosed in the present application as detailed in the attached claims, and other embodiments may also be used, or the embodiments listed herein may be modified in structure and function without departing from the scope and essence of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or positional relationship based on the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0034] In order to illustrate the technical solution described in the present application, a specific embodiment is provided below, and only the parts related to the embodiment of the present application are shown.

[0035] like Figures 1 to 7 As shown, the present application provides an integrated electrothermal conversion direct heating device 1 for tobacco products, which is configured to heat tobacco products 2 to generate aerosol. The electrothermal conversion direct heating device 1 includes an electrothermal conversion element 12 and an injection molded part 11. The electrothermal conversion direct heating device 1 is a combination of the electrothermal conversion element 12 and the injection molded part 11 through in-mold injection. The injection molded part 11 is formed and fixes the electrothermal conversion element 12 during the in-mold injection molding process; the inner surface of the injection molded part 11 and the inner surface of the electrothermal conversion element 12 are on the same curved surface, and a through hole 14 is formed for accommodating the tobacco product 2; both ends of the electrothermal conversion element 12 are exposed on the outer surface of the injection molded part 11 for connecting to external conductive pins 3.

[0036] The material of the injection molded part 11 can be a material with high temperature resistance and low thermal conductivity, such as PEEK, PI, etc. The inner surface of the injection molded part 11 and the inner surface of the electrothermal conversion element 12 are on the same curved surface, the injection molded part 11 tightly fixes the electrothermal conversion element 12, and there is no step difference between the inner surface of the injection molded part 11 and the inner surface of the electrothermal conversion element 12, so that the inner surface of the formed through hole 14 is smooth, ensuring that the tobacco product 2 remains smoothly when inserted into the through hole 14, and the electrothermal conversion element 12 will not be displaced. When the tobacco segment 22 of the tobacco product 2 is heated to generate aerosol, smoke oil may be generated, and the smooth inner surface of the through hole 14 is easy to clean.

[0037] Furthermore, the injection molded part 11 is a hollow structure, and the tobacco product 2 can penetrate the injection molded part 11 .

[0038] Furthermore, a plurality of hollow cavities 111 are formed on the outer surface of the injection molded part 11 during the injection molding process, so as to expose a portion of the electrothermal conversion element 12 .

[0039] When assembling the tobacco product 2, it is only necessary to insert one end of the tobacco product 2 from one end of the injection molded part 11 and pass through the through hole 14. The tobacco segment 22 of the tobacco product 2 is surrounded by the through hole 14, and the other end of the tobacco product 2 extends out from the other end of the injection molded part 11. The tobacco product 2 exposed from the injection molded part 11 can be used as a suction nozzle, and the tobacco product 2 located in the through hole 14 is directly heated by the electrothermal conversion element 12.

[0040] In some embodiments, tobacco product 2 is Figure 2 As shown, the tobacco product 2 is cylindrical and 45 mm long, and includes three parts, namely a first end sponge section 21, a middle tobacco section 22 and a second end sponge section 23. For example, the length of the first end sponge section 21 is 5 mm, the length of the middle tobacco section 22 is 12 mm, and the length of the second end sponge section 23 is 28 mm.

[0041] In order to match the tobacco product 2, the length of the hollow channel 123 formed on the inner surface of the electrothermal conversion element 12 itself is within 6mm-12mm, and the length of the through hole 14 formed by the electrothermal conversion element 12 and the injection molded part 11 can be 8mm-14mm. Under the action of external force, the tobacco product 2 is partially inserted into the through hole 14 where the tobacco product 2 is placed, so that the tobacco shreds 22 of the tobacco product 2 are just surrounded and wrapped by the electrothermal conversion element 12, the middle tobacco shreds 22 are completely surrounded by the through hole 14, and the second end sponge segment 23 and the first end sponge segment 21 can both extend out of the injection molded part 11, and the more the second end sponge segment 23 extends out, the more conducive it is to reduce the mouth burning phenomenon.

[0042] The tobacco product 2 is heated in the through hole 14 to generate aerosol, which is sucked out by the extended second end sponge section 23. Moreover, even if the tobacco shred section 22 generates aerosol when heated to produce smoke oil, the smooth inner surface of the through hole 14 is easy to clean.

[0043] In some embodiments, the electrothermal conversion element 12 includes one or more turns of a spiral coil 121. The shape of the spiral coil 121 can be circular or track-shaped. The inner surface of the spiral coil 121 is on the same curved surface as the inner surface of the injection-molded part 11. The injection-molded part 11 is combined with the spiral coil 121 by in-mold injection molding. The spiral coil 121 is fixed during the in-mold injection molding process. A spacing 122 is maintained between two adjacent spiral coils 121 to ensure that the spiral coils 121 do not contact each other. The outer surface of the spiral coil 121 is partially exposed to the hollow cavity 111 formed by the injection-molded part 11.

[0044] The shape of the spiral coil 121 can be a circle or a racetrack circle, then the shape of the through hole 14 fixedly formed during the in-mold injection molding process of the spiral coil 121 is a cylindrical hole or a racetrack cylindrical hole; the cylindrical hole or the racetrack cylindrical hole through hole 14 is used to surround the tobacco product 2, wherein the position of the electrothermal conversion element 12 formed by the spiral coil 121 is precisely surrounded by the tobacco segment 22, and the inner surface of the through hole 14 is in contact with or mostly in contact with the outer surface of the tobacco product 2.

[0045] The material of the electrothermal conversion element 12 can be an alloy material formed by at least two of nickel, chromium, iron, copper, molybdenum, manganese, silver, silicon, antimony, sulfur, phosphorus, etc., and has a temperature coefficient.

[0046] By laser welding, the two ends of the electrothermal conversion element 12 exposed on the outer surface of the injection molded part 11 are connected to the conductive pins 3, and the conductive pins 3 are electrically connected to the main control module of the smoking device. The main control module of the smoking device can directly obtain the resistance value of the electrothermal conversion element 12, thereby obtaining the temperature change of the electrothermal conversion element 12; if the main control module of the smoking device detects the temperature change of the electrothermal conversion element 12 through the temperature sensor 4, then the temperature sensor 4 is placed on the outer surface of the electrothermal conversion element 12 and fixed with high-temperature resistant adhesive tape. The temperature sensor 4 is used to obtain the temperature change of the electrothermal conversion element 12, and the pin 41 of the temperature sensor 4 can be electrically connected to the main control module, and the main control module obtains the temperature change of the electrothermal conversion element 12 through the temperature sensor 4.

[0047] In some embodiments, the depth of the through hole 14 is less than the length of the tobacco product 2. The tobacco product 2 is longer, and the protruding portion can be used as a mouthpiece. The longer the protruding portion is, the less likely it is to burn your mouth.

[0048] In some of the embodiments, a hollow channel 123 is formed on the inner surface of the electrothermal conversion element 12 , and the length of the hollow channel 123 is less than or equal to the length of the tobacco segment 22 of the tobacco product 2 .

[0049] The length of the hollow channel 123 may be equal to the length of the tobacco segment 22 , or may be less than the length of the tobacco segment 22 , as long as it surrounds the tobacco segment 22 .

[0050] like Figure 5 As shown, two adjacent spiral coils 121 are separated by the injection molded part 11 , and the spacing 122 between adjacent spiral coils 121 and the inner surface of the through hole 14 are located on the same curved surface, so that the tobacco product 2 can easily pass through the through hole 14 .

[0051] like Figure 5-7As shown, the spacing 122 between adjacent spiral coils 121 can be 0-0.8mm, the number of spiral coils 121 can be 1 turn or more, the cross-sectional width of the spiral coil 121 is 0.5mm-30mm, and the thickness is 0.05mm-10mm. The spiral coil 121 forms a hollow channel 123 by winding, and the inner surface of the hollow channel 123 is on the same curved surface as the inner surface of the injection molded part 11.

[0052] In some embodiments, the spiral coil 121 is in the shape of a circle or a racetrack circle, so that the through hole 14 is in the shape of a cylindrical hole or a racetrack cylindrical hole.

[0053] like Figure 6 As shown, if the shape of the spiral coil 121 is circular, the obtained hollow channel 123 is a cylindrical hole, and the shape of the through hole 14 formed by the injection molded part 11 and the spiral coil 121 is also a cylindrical hole; correspondingly, Figure 7 As shown, the shape of the spiral coil 121 is a racetrack circle, and the obtained hollow channel 123 is a racetrack cylindrical hole. Then the shape of the through hole 14 formed by the injection molded part 11 and the spiral coil 121 is also a racetrack cylindrical hole.

[0054] In some embodiments, when the through hole 14 is in the shape of a racetrack cylindrical hole, the length of the line connecting the two bends of the racetrack cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product 2, and the length of the line connecting the two straight lines of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product 2. Thus, the outer surface of the tobacco product 2 can be partially or completely in contact with the inner surface of the through hole 14.

[0055] The working principle of the electrothermal conversion direct heating device 1 of the present application is: when the user uses the electrothermal conversion direct heating device 1 to smoke, the user first inserts the first end sponge segment 21 of the tobacco product 2 into one end of the injection molded part 11, and the user holds the second end sponge segment 23 and pushes the tobacco product 2 so that the tobacco product 2 enters the through hole 14 formed by the injection molded part 11 and the electrothermal conversion element 12 and is exposed, with the longer end exposed as a suction nozzle; at this time, the middle tobacco segment 22 just surrounds the through hole 14 where the electrothermal conversion element 12 of the electrothermal conversion direct heating device 1 is located, and the outer surface of the tobacco segment 22 is completely or mostly in close contact with the inner surface of the through hole 14.

[0056] Then, the user presses the switch of the electrothermal conversion direct heating device 1 to start the electrical connection between the electrothermal conversion direct heating device 1 and the main control module of the external smoking device. The electrothermal conversion element 12 begins to heat up and directly heats the middle tobacco segment 22. At the same time, the main control module of the smoking device detects the temperature changes of the electrothermal conversion element 12 in real time.

[0057] After the middle tobacco segment 22 is heated to a preset time, the main control module of the smoking device detects that the temperature of the electrothermal conversion element 12 reaches the preset temperature value, and prompts the user to smoke. The user then inhales from the second end sponge segment 23 serving as a nozzle.

[0058] In some embodiments, the injection molded part 11 has one or more hollow cavities 111 for partially exposing the electrothermal conversion element 12 ; the outer surface of the injection molded part 11 is wrapped with thermal insulation cotton 13 , and the thermal insulation cotton 13 and the hollow cavity 111 form an air insulation chamber.

[0059] The thermal insulation cotton 13 is an insulation layer, which can be made of thermal insulation cotton and thermal insulation cotton 13 and wrapped on the outer surface of the injection molded part 11. At this time, the hollow cavity 111 on the outer surface of the injection molded part 11 and the thermal insulation cotton 13 form an air insulation chamber, which effectively blocks the heat of the direct heating device 1 from being lost to its outer surface, insulates the direct heating device 1, and prevents heat loss as much as possible.

[0060] In some of the embodiments, the outer surfaces of both ends of the injection molded part 11 are provided with limit platforms 112 , the hollow cavity 111 is located between the two limit platforms 112 , and the thermal insulation cotton 13 is wrapped between the two limit platforms 112 .

[0061] A heat preservation area 113 is located between the two limiting platforms 112 , and the heat preservation cotton 13 wraps the heat preservation area 113 to form an air insulation chamber.

[0062] In some of the embodiments, a plurality of hollow cavities 111 are evenly distributed in the circumferential position of the insulation area 113 , the insulation cotton 13 wraps the outer surface of the insulation area 113 , and the hollow cavities 111 and the insulation cotton 13 form an air insulation chamber.

[0063] like Figure 5 As shown, a plurality of hollow cavities 111 are evenly distributed at the circumferential position of the injection molded part 11, exposing a portion of the spiral coil 121. After the thermal insulation cotton 13 wraps the outer surface of the injection molded part 11, a plurality of air insulation chambers are formed. Since a portion of the spiral coil 121 is exposed in the plurality of hollow cavities 111, the heat of the spiral coil 121 can be retained in the air insulation chamber through the wrapping of the thermal insulation cotton 13, and the heat is not easily dissipated, so that the tobacco product 2 is heated more evenly in the through hole 14.

[0064] In some of the embodiments, the two ends of the electrothermal conversion direct heating device 1 of the present application can often be used in conjunction with other structural parts. For example, one end of the injection molded part 11 can be connected to a neck part by an interference fit. The neck part is a hollow structure. The opening of the neck part can be provided with a protrusion for clamping the tobacco product 2, which can squeeze the inserted tobacco product 2 to form a groove between the tobacco product 2 and the through hole 14; the other end of the injection molded part 11 can be connected to a positioning seat by an interference fit. One end of the positioning seat is an open structure, and the other end is a closed structure. The bottom of the closed structure of the positioning seat has at least one step, so that after the tobacco product 2 is inserted into the through hole 14, it abuts against the step to form a ventilation chamber, which is combined with the groove to form an air circulation channel.

[0065] Of course, the electrothermal conversion direct heating device 1 of the present application is not limited to being used in conjunction with the above-mentioned neck member and positioning seat, and can also be used in conjunction with components of other structures to achieve the heating of the tobacco product 2 by the smoking device to generate aerosol.

[0066] The integrated electrothermal conversion direct heating device 1 for tobacco products of the embodiment of the present application includes an electrothermal conversion element 12 and an injection molded part 11. The electrothermal conversion element 12 and the injection molded part 11 are combined by in-mold injection molding. The inner surface of the injection molded part 11 and the inner surface of the electrothermal conversion element 12 are on the same curved surface, and a through hole 14 is formed for accommodating the tobacco product 2, which can surround the tobacco shreds 22 of the tobacco product 2, directly and accurately heat the tobacco product 2, so that the heating speed of the tobacco shreds 22 is fast, the heating efficiency is high, and the heating effect can be achieved without excessively high temperatures, so as to avoid the surface of the tobacco product 2 being charred while the internal temperature of the tobacco shreds 22 has not reached the suction condition; and the other end of the tobacco product 2 extends from the other end of the injection molded part 11 as a suction nozzle and will not burn the mouth. In addition, the heating device 1 has strong plasticity, and the two ends can be connected to different structural forms, and can be flexibly changed according to tobacco products 2 of different lengths, so that it has good versatility.

[0067] like Figure 8 As shown, the present application also provides a method for preparing an integrated electrothermal conversion direct heating device for tobacco products, comprising steps S10 to S40.

[0068] S10. Select a strip plate or a round tube plate made of alloy material to make an electrothermal conversion element whose inner surface is on the same curved surface.

[0069] In some embodiments, making an electrothermal conversion element may include:

[0070] Select the strip plate made of alloy material;

[0071] The strip plate is wound according to a preset shape, a preset number of turns and a spacing to form a spiral coil with one or more turns and a spacing, and the inner surface of the spiral coil is on the same curved surface.

[0072] Specifically, the alloy material may include at least two of nickel, chromium, iron, copper, molybdenum, manganese, silver, silicon, antimony, sulfur, and phosphorus, and have a temperature coefficient. The cross-sectional width of the strip plate may be 0.5 mm-3 mm, the thickness may be 0.05 mm-10 mm, the number of turns may be 1-8 turns or more, and the spacing between each turn may be 0-0.8 mm.

[0073] The strip sheet material can be wound into a circular or racetrack spiral coil with 1 to 8 turns according to the preset number of turns and spacing.

[0074] In some embodiments, the manufacturing of the electrothermal conversion element may include:

[0075] A round tube sheet is selected, wherein the inner diameter of the round tube sheet is 7.4 mm, the outer diameter is 7.8 mm, and the length is 8 mm;

[0076] The circular tube sheet is laser cut according to a preset number of turns to form a spiral coil with a spacing of 0-0.8 mm. The number of turns can be 1-8 turns, and the inner surfaces of the spiral coils are on the same curved surface.

[0077] The shape of the spiral coil is a circle or a racetrack circle, and the shape of the inner surface of the spiral coil is a cylindrical hole or a racetrack cylindrical hole. The spiral coil can be specifically referred to Figure 6 and Figure 7 .

[0078] S20, making a mold according to the shape and size of the heating device; the heating device includes an electrothermal conversion element and an injection molded part, the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, forming a through hole for accommodating tobacco products;

[0079] S30, fixing the electrothermal conversion element in the mold cavity, injecting plastic into the mold cavity by an injection molding machine, so that the electrothermal conversion element and the plastic are combined in the mold cavity, the injection molded part is formed during the injection molding process, and a through hole for accommodating the tobacco product is formed, and the obtained heating device is taken out from the mold cavity;

[0080] S40, welding electrode pins at both ends of the electrothermal conversion element exposed on the outer surface of the heating device to obtain an integrated electrothermal conversion direct heating device.

[0081] Specifically, the specific structure of the integrated electrothermal conversion direct heating device can refer to the integrated electrothermal conversion direct heating device used for tobacco products mentioned above, and will not be repeated here.

[0082] When welding the electrode pins, laser welding can be used. When the integrated electrothermal conversion device needs to be installed on a smoking device, the electrode pins are welded to the pads corresponding to the main control module of the smoking device.

[0083] In some embodiments, if the main control module of the smoking device detects the temperature change of the electrothermal conversion element through a temperature sensor, then after step S40, the preparation method further includes:

[0084] The temperature sensor is closely attached to the outer surface of the electrothermal conversion element, and the pin of the temperature sensor is extended from the outer surface of the injection molded part.

[0085] Specifically, a temperature sensor can be placed on the outer surface of the electrothermal conversion element and fixed with high-temperature resistant adhesive tape. The temperature sensor is used to obtain the temperature change of the electrothermal conversion element. The pins of the temperature sensor extend from the outer surface of the injection molded part, thereby electrically connecting the pins of the temperature sensor to the main control module. The main control module obtains the temperature change of the electrothermal conversion element through the temperature sensor.

[0086] In some embodiments, the injection molded part has one or more hollow cavities for partially exposing the electrothermal conversion element; after the pins of the temperature sensor are extended from the outer surface of the injection molded part, the preparation method may further include:

[0087] The outer surface of the injection molded part is wrapped with thermal insulation cotton so that the thermal insulation cotton and the hollow cavity form an air insulation chamber.

[0088] Specifically, the thermal insulation cotton can also refer to the thermal insulation cotton of the integrated electric heat conversion direct heating device for tobacco products mentioned above, which will not be described in detail here.

[0089] The preparation method of the integrated electrothermal conversion direct heating device for tobacco products in the embodiment of the present application has a simple preparation process, good consistency, simple structure, and easy assembly. It can be independently customized according to different tobacco products. The through holes formed in the integrated electrothermal conversion direct heating device surround the tobacco segments for direct heating, so that the heat loss of the electrothermal conversion element is small, the heating efficiency is high, the tobacco segments are heated accurately, the heating area is large and uniform, and the heating effect can be quickly achieved without the need for excessively high heating temperatures, so that the surface of the tobacco product will not be scorched and the mouth will not be burned when smoking.

[0090] The above are only preferred embodiments of the present application. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present application.

Claims

1. An integrated electrothermal conversion direct heating device for tobacco products, the integrated electrothermal conversion direct heating device is configured to heat tobacco products to generate aerosol, characterized in that: The integrated electrothermal conversion direct heating device comprises an electrothermal conversion element and an injection molded part. The integrated electrothermal conversion direct heating device is a combination of the electrothermal conversion element and the injection molded part through in-mold injection molding. The injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process. The inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating the tobacco product. Both ends of the electrothermal conversion element are exposed on the outer surface of the injection molded part for connecting external conductive pins. The injection molded part is a hollow structure, one end of the tobacco product is inserted from one end of the injection molded part and passes through the through hole; the other end of the tobacco product extends from the other end of the injection molded part; and the tobacco product is directly heated by the electrothermal conversion element.

2. The integrated electrothermal conversion direct heating device according to claim 1, characterized in that: The injection molded part has more than one hollow cavity for partially exposing the electrothermal conversion element; the outer surface of the injection molded part is wrapped with thermal insulation cotton, and the thermal insulation cotton and the hollow cavity form an air insulation chamber.

3. The integrated electrothermal conversion direct heating device according to claim 2 is characterized in that: The outer surfaces of both ends of the injection molded part are provided with limit platforms, the hollow cavity is located between the two limit platforms, and the thermal insulation cotton is wrapped between the two limit platforms.

4. The integrated electrothermal conversion direct heating device according to claim 1, characterized in that: The electrothermal conversion element includes one or more turns of a spiral coil, the inner surface of the spiral coil and the inner surface of the injection molded part are on the same curved surface; the injection molded part is combined with the spiral coil by in-mold injection molding, and the spiral coil is fixed after in-mold injection molding, and a distance is maintained between two adjacent spiral coils, and the outer surface of the spiral coil is partially exposed in the hollow cavity formed by the injection molded part.

5. The integrated electrothermal conversion direct heating device according to claim 4, characterized in that: The shape of the spiral coil is a circle or a racetrack circle, so that the shape of the through hole is a cylindrical hole or a racetrack cylindrical hole.

6. The integrated electrothermal conversion direct heating device according to claim 5, characterized in that: When the through hole is in the shape of a racetrack cylindrical hole, the length of a line connecting two bends of the racetrack cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product, and the length of a line connecting two straight lines of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.

7. The integrated electrothermal conversion direct heating device according to claim 1, characterized in that: The depth of the through hole is less than or equal to the length of the tobacco product.

8. The integrated electrothermal conversion direct heating device according to claim 1, characterized in that: The inner surface of the electrothermal conversion element forms a hollow channel, and the length of the hollow channel is less than or equal to the length of the tobacco shred segment of the tobacco product.

9. A method for preparing an integrated electrothermal conversion direct heating device for tobacco products, characterized in that: include: Select a strip plate or a round tube plate made of alloy material to make an electrothermal conversion element whose inner surface is on the same curved surface; A mold is made according to the shape and size of the heating device; the heating device includes an electrothermal conversion element and an injection molded part, the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, forming a through hole for accommodating tobacco products; The electrothermal conversion element is fixed in the mold cavity of the mold, and plastic is injected into the mold cavity by an injection molding machine so that the electrothermal conversion element and the plastic are combined in the mold cavity. The injection molded part is formed during the injection molding process and a through hole for accommodating the tobacco product is formed, and the obtained heating device is taken out from the mold cavity of the mold; Electrode pins are welded to the two ends of the electrothermal conversion element exposed on the outer surface of the heating device to obtain an integrated electrothermal conversion direct heating device.

10. The method for preparing the integrated electrothermal conversion direct heating device for tobacco products according to claim 9, characterized in that: The injection molded part has more than one hollow cavity for partially exposing the electrothermal conversion element; after obtaining the integrated electrothermal conversion direct heating device, the preparation method further includes: The outer surface of the injection molded part is wrapped with thermal insulation cotton so that the thermal insulation cotton and the hollow cavity form an air insulation chamber.

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