Integrated electro-thermal conversion direct heating device for tobacco products

Abstract

The utility model discloses an integrated electro-thermal conversion direct heating device for tobacco products. 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 smoking harm reduction, and in particular to an integrated electric heat conversion direct heating device for tobacco products. BACKGROUND

[0002] Currently, there are two ways to heat tobacco products by smoking devices. One way is to set a metal sheet in the tobacco of a tobacco product, and heat the metal sheet in the tobacco by electromagnetic induction technology to heat the tobacco product. However, the metal sheet usually has a small area, and the heating area of the tobacco is limited, so the heating is insufficient, and the corresponding smoking device can only use tobacco products with metal sheets.

[0003] Another way is to place a tobacco product in a heat-conducting shell, and surround the heat-conducting shell with a heating material. The heating material transmits heat to the heat-conducting shell, and the heat-conducting shell heats the tobacco product, thereby indirectly heating the tobacco product. This way of heating requires a high temperature, and 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 not accurate, and the mouthpiece of the tobacco product is hot. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to provide an integrated electric heat conversion direct heating device for tobacco products to solve the technical problems of insufficient heating of tobacco, slow heating speed, hot mouthpiece, and high heat loss in the prior art. The technical effects produced by the optional technical solutions in the many technical solutions provided by the present application are described in detail below.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] In a first aspect, the present application provides an integrated electric heat conversion direct heating device for tobacco products, which is configured to heat a tobacco product to generate an aerosol. The integrated electric heat conversion direct heating device includes an electric heat conversion element and an injection molding piece. The integrated electric heat conversion direct heating device is a combination of the electric heat conversion element and the injection molding piece, which are molded in the injection molding process. The injection molding piece forms a through hole for accommodating the tobacco product, and the inner surface of the injection molding piece and the inner surface of the electric heat conversion element are on the same curved surface. The two ends of the electric heat conversion element are exposed to the outer surface of the injection molding piece for connecting external conductive pins.

[0007] The injection molding piece is a hollow structure, one end of the tobacco product is inserted into and penetrates through the through hole from one end of the injection molding piece, and the other end of the tobacco product extends from the other end of the injection molding piece. The tobacco product is directly heated by the electric heat conversion element.

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

[0009] In some embodiments, the outer surface of the two ends of the injection molding part is provided with limiting platforms, the hollow cavities are located between the two limiting platforms, and the thermal insulation cotton is wrapped between the two limiting platforms.

[0010] In some embodiments, the electro-thermal conversion element comprises one or more spiral coils, the inner surface of the spiral coil is on the same curved surface as the inner surface of the injection molding part; the injection molding part is combined with the spiral coil by in-mold injection molding, the spiral coil is fixed after in-mold injection, a spacing 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 molding part.

[0011] In some embodiments, the spiral coil has a circular or track circle shape, so that the through hole has a cylindrical hole or track cylindrical hole shape.

[0012] In some embodiments, when the through hole has a track cylindrical hole shape, the length of the connecting line of the two bends of the track cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product, and the length of the connecting line of the two straight sections of the track 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 electro-thermal conversion element forms a hollow channel, and the length of the hollow channel matches the length of the tobacco shred segment of the tobacco product.

[0014] In a second aspect, the embodiments of the present application provide a preparation method of an integrated electro-thermal conversion direct heating device for a tobacco product, comprising:

[0015] Selecting an alloy material strip-shaped plate or a circular tube-shaped plate to make an electro-thermal conversion element with an inner surface on the same curved surface;

[0016] Making a mold according to the shape and size of the heating device; the heating device comprises an electro-thermal conversion element and an injection molding part, the inner surface of the injection molding part and the inner surface of the electro-thermal conversion element are on the same curved surface, and a through hole for accommodating a tobacco product is formed;

[0017] The electric heat conversion element is fixed in the cavity of the mold, and plastic is injected into the cavity of the mold by an injection molding machine to combine the electric heat conversion element and the plastic in the mold cavity, so that the injection molding part is formed in the injection molding process and forms a through hole for accommodating the tobacco product, and after the plastic is cooled, the obtained heating device is taken out of the mold cavity;

[0018] The two end electrode pins of the electric heat conversion element are exposed on the outer surface of the heating device to obtain an integrated electric heat conversion direct heating device.

[0019] In some embodiments, the injection molding part has one or more hollow cavities for partially exposing the electric heat conversion element, and after the integrated electric heat conversion direct heating device is obtained, the preparation method further comprises:

[0020] The thermal insulation cotton is wrapped on the outer surface of the injection molding part to form an air insulation chamber between the thermal insulation cotton and the hollow cavity.

[0021] The implementation of one of the technical solutions in the above technical solutions has the following advantages or beneficial effects: the integrated electric heat conversion direct heating device for tobacco products and the preparation method thereof, wherein the heating device comprises an electric heat conversion element and an injection molding part, the electric heat conversion element and the injection molding part are combined by in-mold injection, the inner surface of the injection molding part and the inner surface of the electric heat conversion element are on the same curved surface, and a through hole for accommodating the tobacco product is formed, the tobacco product can be wrapped around the tobacco segment, the tobacco product is directly and accurately heated, the heating efficiency is high, a high temperature is not needed to achieve the heating effect, the surface of the tobacco product is prevented from being burned and the internal temperature of the tobacco segment is prevented from reaching the smoking condition, and the other end of the tobacco product extends from the other end of the injection molding part as a mouthpiece without burning the mouth. Moreover, the heating device has relatively strong plasticity, the two ends can be connected to different structures, the length of the tobacco product can be flexibly changed, and the universality is good. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. In the drawings:

[0023] Figure 1 is a structural schematic diagram of the integrated electric heat conversion direct heating device for tobacco products according to the embodiments of the present application;

[0024] Figure 2is an exploded view of the integrated electro-thermal conversion direct heating device for tobacco products after being inserted into a tobacco product according to an embodiment of the present application;

[0025] Figure 3 is a first structure view of the injection molding part according to an embodiment of the present application;

[0026] Figure 4 is a cross-sectional view of the integrated electro-thermal conversion direct heating device for tobacco products after being inserted into a tobacco product according to an embodiment of the present application;

[0027] Figure 5 is a structure view of the integrated electro-thermal conversion direct heating device for tobacco products without wrapping insulation cotton according to an embodiment of the present application;

[0028] Figure 6 is a structure view of the electro-thermal conversion element including multiple coils according to an embodiment of the present application;

[0029] Figure 7 is another structure view of the electro-thermal conversion element including multiple coils according to an embodiment of the present application;

[0030] Figure 8 is a flow chart of the preparation method of the integrated electro-thermal conversion direct heating device for tobacco products according to an embodiment of the present application;

[0031] In the figure: 1, integrated electro-thermal conversion direct heating device; 2, tobacco product; 3, conductive pin; 4, temperature sensor; 11, injection molding part; 12, electro-thermal conversion element; 13, insulation cotton; 14, through hole; 21, first end sponge section; 22, tobacco section; 23, second end sponge section; 41, pin of temperature sensor; 111, hollow cavity; 112, limiting platform; 113, insulation area; 121, spiral coil; 122, interval; 123, hollow channel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present application more clear, the various exemplary embodiments to be described below will be described with reference to the corresponding drawings, which form a part of the exemplary embodiments, and various exemplary embodiments that can 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 described in the following exemplary embodiments does not represent all the implementations consistent with the present disclosure. It should be understood that they are only examples of processes, methods and devices, etc. consistent with some aspects of the present disclosure as detailed in the appended claims, and other embodiments can be used, or structural and functional modifications can be made to the embodiments listed herein, without departing from the scope and spirit of the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse" and the like indicate the orientation or positional relationship based on the drawings shown, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "a plurality of" means two or more. The terms "connected", "connected" should be broadly understood, for example, it can be fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, communication connection, direct connection, indirect connection through intermediate medium, internal communication of two elements or interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In order to illustrate the technical solutions described in the present application, the following will be described by specific examples, only showing the parts related to the embodiments of the present application.

[0035] As shown in Figures 1 to 7 The present application provides an integrated electro-thermal conversion direct heating device 1 for tobacco products, which is configured to heat tobacco products 2 to generate aerosol. The electro-thermal conversion direct heating device 1 comprises an electro-thermal conversion element 12 and an injection molding part 11. The electro-thermal conversion direct heating device 1 is a combination of the electro-thermal conversion element 12 and the injection molding part 11, which are in-mold injection molded. The injection molding part 11 is shaped and fixed to the electro-thermal conversion element 12 during the in-mold injection molding process. The inner surface of the injection molding part 11 and the inner surface of the electro-thermal conversion element 12 are on the same curved surface, and form a through hole 14 for accommodating the tobacco products 2. The two ends of the electro-thermal conversion element 12 are exposed to the outer surface of the injection molding part 11, and are used to connect external conductive pins 3.

[0036] The material of the injection molding 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 molding part 11 and the inner surface of the electro-thermal conversion element 12 are on the same curved surface, the injection molding part 11 tightly fixes the electro-thermal conversion element 12, and there is no any gap between the inner surface of the injection molding part 11 and the inner surface of the electro-thermal conversion element 12, so that the inner surface of the through hole 14 formed is smooth, ensuring that the tobacco products 2 inserted into the through hole 14 are smooth, and the electro-thermal conversion element 12 will not displace. When the tobacco products 2 are heated to generate aerosol, oil may be generated. The smooth inner surface of the through hole 14 facilitates cleaning.

[0037] And the injection molding part 11 is a hollow structure, and the tobacco products 2 can penetrate through the injection molding part 11.

[0038] And, the outer surface of the injection molding part 11 is formed with a plurality of hollow cavities 111 when the injection molding part 11 is formed by in-mold injection molding, for exposing part of the electro-thermal conversion element 12.

[0039] When the tobacco product 2 is assembled, only one end of the tobacco product 2 is inserted into and passes through the through hole 14 from one end of the injection molding part 11, the tobacco product 2 is surrounded by the through hole 14, and the other end of the tobacco product 2 extends from the other end of the injection molding part 11, exposing the tobacco product 2 of the injection molding part 11, which can be used as a mouthpiece, and the tobacco product 2 located in the through hole 14 is directly heated by the electro-thermal conversion element 12.

[0040] In some embodiments, the tobacco product 2 is cylindrical, as shown in FIG. 1, with a length of 45 mm, and includes three parts, namely a first end sponge segment 21, a middle tobacco segment 22, and a second end sponge segment 23. For example, the length of the first end sponge segment 21 is 5 mm, the length of the middle tobacco segment 22 is 12 mm, and the length of the second end sponge segment 23 is 28 mm. Figure 2

[0041] In order to match the tobacco product 2, the length of the hollow channel 123 formed by the inner surface of the electro-thermal conversion element 12 is within 6 mm-12 mm, and the length of the through hole 14 formed by the in-mold injection molding of the electro-thermal conversion element 12 and the injection molding part 11 can be 8 mm-14 mm. The tobacco product 2 is partially inserted into the through hole 14 for placing the tobacco product 2 under the action of an external force, at which time the tobacco segment 22 of the tobacco product 2 is exactly wrapped by the electro-thermal conversion element 12, the middle tobacco segment 22 is 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 molding part 11, and the more the second end sponge segment 23 extends out, the more it helps to reduce the burning of the mouth.

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

[0043] In some embodiments, the electro-thermal conversion element 12 includes one or more spiral coils 121, the shape of the spiral coil 121 can be circular or track round, the inner surface of the spiral coil 121 is on the same curved surface as the inner surface of the injection molding part 11; the injection molding 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 adjacent two spiral coils 121 to ensure that the spiral coils 121 do not contact each other, and part of the outer surface of the spiral coil 121 is exposed to the hollow cavities 111 formed by the injection molding part 11.

[0044] ​The shape of the spiral coil 121 can be circular or track circular, and the shape of the through hole 14 formed by the spiral coil 121 fixed in the in-mold injection process is a cylindrical hole or a track cylindrical hole; the cylindrical hole or the track cylindrical hole through hole 14 is used to surround the tobacco product 2, and the position where the spiral coil 121 forms the electrothermal conversion element 12 is accurately surrounded by the tobacco segment 22, and the inner surface of the through hole 14 is in contact or most 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] The two ends of the electrothermal conversion element 12 exposed on the outer surface of the injection molding part 11 are connected with the conductive pin 3 by laser welding, and the conductive pin 3 is electrically connected with the main control module of the smoking set. The main control module of the smoking set can directly obtain the resistance value of the electrothermal conversion element 12, so as to obtain the temperature change of the electrothermal conversion element 12; if the main control module of the smoking set detects the temperature change of the electrothermal conversion element 12 through the temperature sensor 4, the temperature sensor 4 is placed on the outer surface of the electrothermal conversion element 12 and fixed by using high-temperature-resistant adhesive paper. 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 with 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 length of the tobacco product 2 is longer, and the protruding part can be used as a mouthpiece. The longer the protruding part, the less likely it is to burn the mouth.

[0048] In some embodiments, the inner surface of the electrothermal conversion element 12 forms a hollow channel 123, 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 can be equal to the length of the tobacco segment 22, or less than the length of the tobacco segment 22, as long as the surrounding mode of the tobacco segment 22 is available.

[0050] As shown in Figure 5 The adjacent two spiral coils 121 are separated by the injection molding part 11, and the distance 122 between the adjacent spiral coils 121 is on the same curved surface with the inner surface of the through hole 14, so that the tobacco product 2 is easily penetrated through the through hole 14.

[0051] As shown in Figures 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 circular or raceway-shaped, so that the through hole 14 is cylindrical or raceway-shaped.

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

[0054] In some embodiments, when the through hole 14 is shaped like 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 sections of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product 2. This allows the outer surface of the tobacco product 2 to partially or completely contact the inner surface of the through hole 14.

[0055] The working principle of the electrothermal conversion direct heating device 1 of this application is as follows: When the user smokes using the electrothermal conversion direct heating device 1, the first end of the tobacco product 2, the sponge segment 21, is inserted into one end of the injection molded part 11. The user holds the second end of the 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 the mouthpiece. At this time, the middle tobacco segment 22 is exactly around 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 in complete or most of 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 starts to heat up and directly heats the middle tobacco section 22. At the same time, the main control module of the smoking device detects the temperature change of the electrothermal conversion element 12 in real time.

[0057] After the intermediate tobacco rod segment 22 is heated for a preset time, the main control module of the smoking set detects that the temperature of the electric heating conversion element 12 reaches a preset temperature value, prompting the user that the user can smoke, and the user sucks the second end sponge segment 23 as a mouthpiece at this time.

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

[0059] The thermal insulation cotton 13 is a heat insulation layer, which can be made of heat insulation cotton or thermal insulation cotton 13 material, wrapped on the outer surface of the injection molding part 11. At this time, the hollow cavities 111 on the outer surface of the injection molding part 11 and the thermal insulation cotton 13 form an air insulation chamber, effectively blocking the heat loss of the direct heating device 1 to its outer surface, insulating and keeping warm the direct heating device 1, and preventing heat loss as much as possible.

[0060] In some embodiments, the outer surface of the two ends of the injection molding part 11 is provided with a limiting table 112, and the hollow cavities 111 are located between the two limiting tables 112, and the thermal insulation cotton 13 is wrapped between the two limiting tables 112.

[0061] The space between the two limiting tables 112 is a thermal insulation area 113, and the thermal insulation cotton 13 wraps the thermal insulation area 113 to form an air insulation chamber.

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

[0063] As shown in Figure 5 A plurality of hollow cavities 111 are uniformly distributed at the circumferential position of the injection molding part 11 to expose part of the spiral coil 121. After the outer surface of the injection molding part 11 is wrapped with the thermal insulation cotton 13, a plurality of air insulation chambers are formed. Since the plurality of hollow cavities 111 expose part of the spiral coil 121, 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. This makes the tobacco product 2 heated more evenly in the through hole 14.

[0064] In some embodiments, the two ends of the electric-thermal conversion direct heating device 1 can be used in combination with other structural components. For example, one end of the injection molding component 11 can be connected to a neck component through interference fit. The neck component has a hollow structure, and a protrusion for clamping the tobacco product 2 can be arranged at the opening of the neck component. The inserted tobacco product 2 can be squeezed to form a groove between the tobacco product 2 and the through hole 14. The other end of the injection molding component 11 can be connected to a positioning seat through interference fit. One end of the positioning seat is an open structure, and the other end is a closed structure. The inner bottom of the closed structure of the positioning seat has at least one step. After the tobacco product 2 is inserted into the through hole 14, the tobacco product 2 abuts against the step to form an air exchange chamber. In combination with the groove, an air flow passage is formed.

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

[0066] The integrated electric-thermal conversion direct heating device 1 for a tobacco product according to the embodiments of the present application includes an electric-thermal conversion element 12 and an injection molding component 11. The electric-thermal conversion element 12 and the injection molding component 11 are combined by in-mold injection. The inner surface of the injection molding component 11 and the inner surface of the electric-thermal conversion element 12 are on the same curved surface and form a through hole 14 for accommodating a tobacco product 2. The tobacco product 2 can be wrapped around the tobacco shred section 22. The tobacco product 2 is directly and accurately heated, the heating speed of the tobacco shred section 22 is fast, the heating efficiency is high, a high temperature is not required to achieve the heating effect, and the surface of the tobacco product 2 is prevented from being burned while the internal temperature of the tobacco shred section 22 has not reached the smoking condition. In addition, the other end of the tobacco product 2 extends from the other end of the injection molding component 11 as a mouthpiece and does not burn the mouth. In addition, the heating device 1 has strong plasticity, the two ends can be connected to different structural forms, and the generality is good according to the flexible change of the tobacco product 2 with different lengths.

[0067] As shown in Figure 8 The present application also provides a preparation method of an integrated electric-thermal conversion direct heating device for a tobacco product, which includes steps S10 to S40.

[0068] S10, selecting a strip-shaped plate or a circular tube plate made of an alloy material to manufacture an electric-thermal conversion element with inner surfaces on the same curved surface.

[0069] In some embodiments, the manufacturing of the electric-thermal conversion element can include:

[0070] selecting a strip-shaped plate made of an alloy material;

[0071] According to the preset shape, the preset number of turns and the interval, the strip-shaped plate is wound to form a spiral coil with an interval and one or more turns, and the inner surface of the spiral coil is on the same curved surface.

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

[0073] The strip-shaped plate can be wound into a circular or racetrack circular spiral coil with 1-8 turns according to the preset number of turns and the interval.

[0074] In some embodiments, the method of manufacturing the electro-thermal conversion element can include:

[0075] A circular tube plate is selected, which has an inner diameter of 7.4mm, an outer diameter of 7.8mm, and a length of 8mm.

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

[0077] The shape of the spiral coil is circular or racetrack circular, 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 in Figure 6 and Figure 7 .

[0078] S20, a mold is manufactured according to the shape and size of the heating device; the heating device includes an electro-thermal conversion element and an injection molding part, the inner surface of the injection molding part and the inner surface of the electro-thermal conversion element are on the same curved surface, forming a through hole for accommodating a tobacco product;

[0079] S30, the electro-thermal conversion element is fixed in the mold cavity, and plastic is injected into the mold cavity by an injection molding machine to combine the electro-thermal conversion element and the plastic in the mold cavity. The injection molding part is formed during the injection molding process and forms a through hole for accommodating a tobacco product. After the plastic cools down, the obtained heating device is taken out of the mold cavity;

[0080] S40, the two end electrode pins of the electro-thermal conversion element are exposed on the outer surface of the heating device, and an integrated electro-thermal conversion direct heating device is obtained.

[0081] Specifically, the specific structure of the integrated electro-thermal conversion direct heating device can refer to the foregoing integrated electro-thermal conversion direct heating device for tobacco products, which will not be described here.

[0082] In the process of welding the electrode pin, laser welding can be used. When the integrated electro-thermal conversion device needs to be installed in the smoking set, the electrode pin is welded to the corresponding pad of the master control module of the smoking set.

[0083] In some embodiments, if the master control module of the smoking set detects the temperature change of the electro-thermal conversion element through the temperature sensor, the preparation method further comprises the following steps after step S40:

[0084] The temperature sensor is attached to the outer surface of the electro-thermal conversion element, and the pin of the temperature sensor extends from the outer surface of the injection molding part.

[0085] Specifically, the temperature sensor can be placed on the outer surface of the electro-thermal conversion element and fixed with high-temperature-resistant adhesive paper. The temperature sensor is used to obtain the temperature change of the electro-thermal conversion element, and the pin of the temperature sensor extends from the outer surface of the injection molding part, so as to electrically connect the pin of the temperature sensor with the master control module. The master control module obtains the temperature change of the electro-thermal conversion element through the temperature sensor.

[0086] In some embodiments, the injection molding part has more than one hollow cavity for partially exposing the electro-thermal conversion element. After the pin of the temperature sensor extends from the outer surface of the injection molding part, the preparation method can further comprise the following steps:

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

[0088] Specifically, the thermal insulation cotton can also refer to the thermal insulation cotton of the integrated electro-thermal conversion direct heating device for tobacco products as described above, which will not be described here.

[0089] The preparation method of the integrated electro-thermal conversion direct heating device for tobacco products according to the embodiments of the present application has the advantages of simple preparation process, good consistency, simple structure, convenient assembly, and independent customization according to different tobacco products. The through hole formed by the integrated electro-thermal conversion direct heating device surrounds the tobacco segment for direct heating, which reduces the heat loss of the electro-thermal conversion element, improves the heating efficiency, precisely heats the tobacco segment, and uniformly heats a large area without the need for high heating temperature to quickly achieve the heating effect, so that the surface of the tobacco product will not be scorched and the mouth will not be burned when smoking.

[0090] The above merely provides preferred embodiments of the present application, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the teaching of the present application 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 are within the protection scope of the present application.

Claims

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

2. The integrated electro-thermal conversion direct heating device according to claim 1, wherein, The injection molding part has one or more hollow cavities for partially exposing the electrothermal conversion element; the outer surface of the injection molding part is wrapped with thermal insulation cotton, and the thermal insulation cotton forms an air insulation warehouse with the hollow cavity.

3. The integrated electro-thermal conversion direct heating device according to claim 2, wherein, The outer surface of the two ends of the injection molding part is provided with a limiting table, the hollow cavity is located between the two limiting tables, and the thermal insulation cotton is wrapped between the two limiting tables.

4. The integrated electro-thermal conversion direct heating device according to claim 1, wherein, The electrothermal conversion element comprises one or more spiral coils, the inner surface of the spiral coil is on the same curved surface as the inner surface of the injection molding part; the injection molding part is combined with the spiral coil by in-mold injection molding, the spiral coil is fixed after in-mold injection, the adjacent two spiral coils maintain a spacing, and the outer surface of the spiral coil is partially exposed to the hollow cavity formed by the injection molding part.

5. The integrated electro-thermal conversion direct heating device according to claim 4, wherein, The shape of the spiral coil is circular or track circle, so that the shape of the through hole is cylindrical hole or track cylindrical hole.

6. The integrated electro-thermal conversion direct heating device according to claim 5, wherein, When the shape of the through hole is track cylindrical hole, the length of the connecting line of the two bends of the track cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product, and the length of the connecting line of the two straight lines of the track cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.

7. The integrated electro-thermal conversion direct heating device according to claim 1, wherein, The depth of the through hole is less than or equal to the length of the tobacco product.

8. The integrated electro-thermal conversion direct heating device of claim 1, wherein, 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 cut segment.

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