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 tobacco products and a preparation method of the integrated electro-thermal conversion direct heating device. The direct heating device comprises an electric heating conversion element and an injection molding part, the injection molding part is formed in the in-mold injection molding process and fixes the electric heating conversion element, one end of the tobacco product extends into the heating cavity from the opening of the injection molding part and abuts against the step, and a ventilation bin is formed; the other end of the tobacco product extends out of the opening to serve as a suction nozzle, and the tobacco product is clamped through the opening and directly heated through the electric heating conversion element. The cut tobacco section is directly heated in a surrounding mode through the heating cavity formed by the inner surface of the injection molding part and the electric heating conversion element, the hollow cavity and the heat preservation cotton can form an air heat insulation bin, and therefore the electric heating conversion element is small in heat loss, high in heating efficiency and high in temperature rising speed, the cut tobacco section is accurately heated, and the heating area is large and uniform; the heating effect can be quickly achieved without too high heating temperature, so that the surface of the tobacco product cannot be burnt, and the mouth cannot be scalded during smoking.

Description

Technical Field

[0001] The present application relates to the technical field of harmless smoking, and in particular to an integrated electric heat conversion direct heating device for tobacco products. 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 electrothermal conversion direct heating device is configured to heat tobacco products to generate aerosol; the integrated electrothermal conversion direct heating device comprises an electrothermal conversion element and an injection molded part, which is a combination of the electrothermal conversion element and the injection molded part by in-mold injection, wherein the injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process;

[0007] The inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and form a heating cavity 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; the injection molded part has more than one hollow cavity, which is used to expose part of the outer surface of the electrothermal conversion element;

[0008] One end of the injection molded part is provided with an opening, and the other end is a closed structure; the inner bottom of the closed structure has at least one step for limiting the position of the tobacco product;

[0009] Among them, one end of the tobacco product extends into the heating cavity from the opening and abuts against the step to form a ventilation chamber; the other end of the tobacco product extends from the opening as a suction nozzle, the tobacco product is clamped through the opening, and is directly heated by the electrothermal conversion element.

[0010] In some embodiments, the outer surfaces of both ends of the injection molded part are provided with limit platforms, and the hollow cavity is located between the two limit platforms; thermal insulation cotton is wrapped between the two limit platforms, and the thermal insulation cotton and the hollow cavity form an air insulation chamber.

[0011] 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.

[0012] In some embodiments, the spiral coil is in the shape of a circle or a racetrack circle, so that the inner surface of the spiral coil is in the shape of a cylindrical hole or a racetrack cylindrical hole.

[0013] In some embodiments, the area between the two limit platforms is a heat preservation area, the inner surface of the heat preservation area forms a cylinder, the height of the cylinder is greater than or equal to the height of the cylindrical hole or the height of the runway cylindrical hole, and the depth of the heating cavity is greater than the height of the cylinder.

[0014] At least two grooves are provided between the inner surface of the column and the outer surface of the tobacco product, and the opening, the grooves and the ventilation chamber form an air convection channel.

[0015] In some embodiments, at least two protrusions are provided at the opening toward the center of the opening, and the tobacco product can be squeezed and deformed by the protrusions to form the groove when extending into the heating cavity.

[0016] In some embodiments, when the shape of the cylinder is a runway cylindrical hole, the length of the line connecting the two bends of the runway cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product, and the length of the line connecting the two straight lines of the runway cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.

[0017] In some embodiments, the total cross-section of all the steps is smaller than the cross-section of the tobacco product, so that after the tobacco product is inserted into the heating chamber, the tobacco product abuts against the steps to form the ventilation chamber.

[0018] In a second aspect, the present application provides a method for preparing an integrated electrothermal conversion direct heating device for tobacco products, comprising:

[0019] 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;

[0020] A mold is made according to the shape and size of the heating device; wherein the heating device includes an electrothermal conversion element and an injection molded part, the inner side wall of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, forming a heating cavity for accommodating tobacco products, and one end of the heating cavity is provided with an opening, and the other end is a closed structure, and the inner bottom of the closed structure has at least one step;

[0021] The electrothermal conversion element is fixed in the mold cavity, 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 has a plurality of hollow cavities for exposing a portion of the outer surface of the electrothermal conversion element; and the obtained heating device is taken out from the mold cavity;

[0022] 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.

[0023] Implementing one of the above-mentioned technical solutions of the present application has the following advantages or beneficial effects: an integrated electric heat conversion direct heating device for tobacco products of the present application and a preparation method thereof, through the combination of the electric heat conversion element and the injection molding in the mold, a heating cavity is formed to surround the tobacco segments of the tobacco product, directly and accurately heat the tobacco product, and multiple hollow cavities on the outer surface of the injection molding can form an air insulation chamber, which has less heat loss than indirect heating, so that the heating speed of the tobacco segments is fast, the heating efficiency is high, and the heating effect can be achieved without excessively high temperatures, avoiding the surface of the tobacco product from being burned while the internal temperature of the tobacco segments has not reached the smoking condition; and one end of the tobacco product is abutted against the closed end of the heating cavity to form a ventilation chamber, and combined with the opening to form an air circulation channel, so that the resistance to smoking the tobacco product is small, and the other end of the tobacco product located at the opening will not burn the mouth as a suction nozzle, and the tobacco product is clamped by the opening of the injection molding, and will not be taken out of the heating cavity when the user sucks on the suction nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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:

[0025] Figure 1 It is a structural schematic diagram of the integrated electric heat conversion direct heating device involved in the embodiment of the present application without installing thermal insulation cotton;

[0026] Figure 2 It is a schematic diagram of the structure of the integrated electric heat conversion direct heating device involved in the embodiment of the present application after being inserted into a tobacco product;

[0027] Figure 3 is an exploded view of the integrated electric heat conversion direct heating device involved in the embodiment of the present application;

[0028] Figure 4 is a cross-sectional view of an integrated electric heat conversion direct heating device involved in an embodiment of the present application;

[0029] Figure 5 is a schematic structural diagram of an injection molded part involved in an embodiment of the present application;

[0030] Figure 6 is a structural schematic diagram of an electrothermal conversion element involved in an embodiment of the present application including a plurality of spiral coils;

[0031] Figure 7 is another structural schematic diagram of an electrothermal conversion element according to an embodiment of the present application including a plurality of spiral coils;

[0032] Figure 8 is a top view of the integrated electric heat conversion direct heating device involved in the embodiment of the present application;

[0033] Fig. 9 It is a schematic flow chart of a method for preparing an integrated electric heat conversion direct heating device for tobacco products involved in an embodiment of the present application;

[0034] In the figure: 1. integrated electrothermal conversion direct heating device; 2. tobacco products; 3. conductive pins; 4. ventilation chamber; 5. temperature sensor; 11. electrothermal conversion element; 12. injection molded parts; 13. thermal insulation cotton; 21. first end sponge section; 22. tobacco section; 23. second end sponge section; 51. pin of temperature sensor; 111. spiral coil; 112. spacing; 113. hollow channel; 121. hollow cavity; 122. opening; 123. step; 124. limit platform; 125. protrusion; 126. thermal insulation area. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] like Figures 1 to 8 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 integrated electrothermal conversion direct heating device 1 includes an electrothermal conversion element 11 and an injection molded part 12. The electrothermal conversion direct heating device 1 is a combination of the electrothermal conversion element 11 and the injection molded part 12 by in-mold injection molding. The injection molded part 12 is formed and fixes the electrothermal conversion element 11 during the in-mold injection molding process.

[0039] The inner side wall of the injection molded part 12 and the inner surface of the electrothermal conversion element 11 are on the same curved surface, and form a heating cavity for accommodating the tobacco product 2; both ends of the electrothermal conversion element 11 are exposed on the outer surface of the injection molded part 12, and are used to connect the external conductive pins 3; the injection molded part 12 has more than one hollow cavity 121, which is used to expose part of the outer surface of the electrothermal conversion element 11;

[0040] One end of the injection molded part 12 is provided with an opening 122, and the other end is a closed structure; the inner bottom of the closed structure has at least one step 123 for limiting the position of the tobacco product 2;

[0041] Among them, one end of the tobacco product 2 extends into the heating cavity from the opening 122 and abuts against the step 123 to form a ventilation chamber 4; the other end of the tobacco product 2 extends from the opening 122 as a suction nozzle, the tobacco product 2 is clamped by the opening 122, and is directly heated by the electrothermal conversion element 11.

[0042] Among them, the material of the injection molded part 12 can be a material with high temperature resistance and low thermal conductivity, such as PEEK, PI, etc. The injection molded part 12 is tightly fixed to the electrothermal conversion element 11 by in-mold injection molding. There is no step difference between the inner side wall of the injection molded part 12 and the inner surface of the electrothermal conversion element 11, so that the inner surface of the formed heating cavity is smooth, ensuring that the tobacco product 2 remains smooth when inserted into the heating cavity, and the electrothermal conversion element 11 will not be displaced. When the tobacco shreds 22 of the tobacco product 2 are heated to generate aerosol, smoke oil may be generated, and the smooth inner surface of the heating cavity is convenient for cleaning. In addition, a plurality of hollow cavities 121 are formed on the outer surface of the injection molded part 12 during in-mold injection molding to expose part of the electrothermal conversion element 11.

[0043] The opening 122 of the injection molded part 12 has two functions. One is to clamp the tobacco product 2. Specifically, at least two protrusions 125 are provided at the center of the opening 122 to clamp the tobacco product 2. At the same time, the tobacco product 2 can be squeezed and deformed by the protrusions 125 when inserted, and a groove is formed when inserted into the heating cavity for air circulation; the second is that the inserted part of the tobacco product 2 is squeezed by the opening 122, and the tobacco product 2 is deformed as a whole to match the shape of the hollow channel 113 of the electrothermal conversion element 11 and can fit more closely; at the same time, when the opening 122, the groove on the surface of the tobacco product 2, and the ventilation chamber 4 form air circulation, the heat on the surface of the second end sponge section 23 near the opening 122 is brought to the ventilation chamber 4, effectively reducing the surface temperature of the second end sponge section 23. It is conducive to solving the problem of burning the mouth and making the user's suction resistance smaller. When the user wants to remove the tobacco product 2, the user holds the tobacco product 2 tightly and pulls the tobacco product 2 outward with force, so as to remove the tobacco product 2 from the heating cavity.

[0044] The inner bottom of the closed structure at the other end of the injection molded part 12 has at least one step 123 for limiting the position of the tobacco product 2 ; when one end of the tobacco product 2 abuts against the step 123 , it forms a ventilation chamber 4 with the inner bottom of the injection molded part 12 .

[0045] In some embodiments, tobacco product 2 is Figure 3 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.

[0046] In order to match the tobacco product 2, the hollow channel 113 (such as Figure 6 or Figure 7 The length of 113) is within 6mm-12mm, the depth of the heating cavity formed by the electrothermal conversion element 11 and the injection molded part 12 can be 13mm-25mm, and the tobacco product 2 is partially inserted into the heating cavity where the tobacco product 2 is placed under the action of external force. At this time, the tobacco segment 22 of the tobacco product 2 is just surrounded and wrapped by the electrothermal conversion element 11, the first end sponge segment 21 and the middle tobacco segment 22 are completely contained in the heating cavity, and most of the second end sponge segment 23 is not in the heating cavity. The more the second end sponge segment 23 extends, the more conducive it is to reducing the burning mouth phenomenon.

[0047] The tobacco product 2 is heated in the heating chamber to generate aerosol, which is sucked out by the extended second end sponge section 23. Further, the air enters the ventilation chamber 4 from the opening 122 of the injection molded part 12, enters from the first end sponge section 21, passes through the middle tobacco shred section 22, and is sucked out from the second end sponge section 23. Moreover, the tobacco shred section 22 generates aerosol when heated to produce tobacco oil. Even if the tobacco oil cannot be absorbed by the first end sponge section 21, it will directly fall into the inner bottom of the closed structure of the injection molded part 12 and will not flow out, which is easy to clean.

[0048] In some embodiments, the electrothermal conversion element 11, such as Figure 6 or Figure 7 As shown, the electrothermal conversion element 11 includes one or more turns of a spiral coil 111. The shape of the spiral coil 111 can be circular or track-shaped. The inner surface of the spiral coil 111 is on the same curved surface as the inner surface of the injection molded part 12. The injection molded part 12 is combined with the spiral coil 111 by in-mold injection molding. The spiral coil 111 is fixed during the in-mold injection molding process. A spacing 112 is maintained between two adjacent spiral coils 111 to ensure that the spiral coils 111 do not contact each other. The outer surface of the spiral coil 111 is partially exposed to the hollow cavity 121 formed by the injection molded part 12.

[0049] The shape of the spiral coil 111 can be a circle or a racetrack circle, then the shape of the through hole fixedly formed during the in-mold injection molding process of the spiral coil 111 is a cylindrical hole or a racetrack cylindrical hole; the cylindrical hole or the racetrack cylindrical hole is used to surround the tobacco product 2, wherein the position of the electrothermal conversion element 11 formed by the spiral coil 111 is precisely surrounded by the tobacco segment 22, and the inner surface of the through hole is in contact with or mostly in contact with the outer surface of the tobacco product 2.

[0050] The material of the electrothermal conversion element 11 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.

[0051] In some embodiments, laser welding can be used to connect the two ends of the electrothermal conversion element 11 exposed on the outer surface of the injection molded part 12 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 11, thereby obtaining the temperature change of the electrothermal conversion element 11; if the main control module of the smoking device detects the temperature change of the electrothermal conversion element 11 through the temperature sensor 5, then the temperature sensor 5 is placed on the outer surface of the electrothermal conversion element 11 and fixed with high-temperature resistant adhesive tape. The temperature sensor 5 is used to obtain the temperature change of the electrothermal conversion element 11, and the pin 51 of the temperature sensor can be electrically connected to the main control module. The main control module obtains the temperature change of the electrothermal conversion element 11 through the temperature sensor 5.

[0052] In some embodiments, the outer surfaces of both ends of the injection molded part 12 are provided with limit platforms 124, and the hollow cavity 121 is located between the two limit platforms 124; the two limit platforms 124 are wrapped with insulation cotton 13, and the insulation cotton 13 and the hollow cavity 121 form an air insulation chamber.

[0053] The thermal insulation cotton 13 is an insulation layer, which can be made of thermal insulation cotton and thermal insulation cotton 13, and is wrapped between the two limit platforms 124 on the outer surface of the injection molded part 12. At this time, the hollow cavity 121 on the outer surface of the injection molded part 12 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.

[0054] In some embodiments, the area between the two limit platforms 124 is the insulation area 126, the inner surface of the insulation area 126 forms a cylinder, the height h2 of the cylinder is greater than or equal to the height h1 of the cylindrical hole or the height h1 of the runway cylindrical hole, and the depth h3 of the heating cavity is greater than the height h2 of the cylinder.

[0055] In some of the embodiments, a plurality of hollow cavities 121 are evenly distributed in the circumferential position of the insulation area 126 of the injection molded part 12 , the insulation cotton 13 wraps the outer surface of the insulation area 126 , and the hollow cavities 121 and the insulation cotton 13 form an air insulation chamber.

[0056] Multiple hollow cavities 121 are evenly distributed in the circumferential position of the insulation area 126 of the injection molded part 12, exposing part of the spiral coil 111. After the insulation cotton 13 wraps the insulation area 126 on the outer surface of the injection molded part 12, since multiple hollow cavities 121 expose part of the spiral coil 111, the heat of the spiral coil 111 can be retained in the air insulation chamber through the wrapping of the insulation cotton 13, and the heat is not easily dissipated, so that the tobacco product 2 is heated more evenly in the heating cavity.

[0057] In some embodiments, at least two grooves are provided between the inner surface of the column and the outer surface of the tobacco product 2, and the opening 122 of the injection molded part 12, the grooves and the ventilation chamber 4 form an air circulation channel.

[0058] In some embodiments, the opening 122 of the injection molded part 12 is provided with at least two protrusions 125 toward the center of the opening 122, and the tobacco product 2 can be squeezed and deformed by the protrusions 125 to form a groove when inserted into the heating cavity. The protrusions 125 are also used to clamp the tobacco product 2.

[0059] like Figure 6 As shown, two adjacent spiral coils 111 are separated by the injection molded part 12, and the spacing 112 between adjacent spiral coils 111 is located on the same curved surface as the inner surface of the cylinder, so that the tobacco product 2 can be easily inserted into the heating cavity.

[0060] like Figure 6 As shown, the spacing 112 between adjacent spiral coils 111 can be 0-0.8mm, the number of spiral coils 111 can be 1 turn or more, the cross-sectional width of the spiral coil 111 is 0.5mm-30mm, and the thickness is 0.05mm-10mm. The spiral coil 111 is wound to form a cylindrical hole or a runway cylindrical hole, so that the inner surface of the spiral coil 111 is in the shape of a cylindrical hole or a runway cylindrical hole, and the inner surface of the cylindrical hole or the runway cylindrical hole is on the same curved surface as the inner surface of the cylinder of the injection molded part 12.

[0061] like Figure 6 As shown, if the shape of the spiral coil 111 is circular, a cylindrical hole is obtained, and the shape of the column of the heating cavity formed by the injection molded part 12 and the spiral coil 111 is also a cylindrical hole; correspondingly, Figure 7 As shown, the shape of the spiral coil 111 is a racetrack circle, and a racetrack cylindrical hole is obtained. Then the shape of the column of the heating cavity formed by the injection molded part 12 and the spiral coil 111 is also a racetrack cylindrical hole.

[0062] In some embodiments, when the shape of the inner surface of the spiral coil 111 is 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 cylinder, and the groove formed is actually the part where the outer surface of the tobacco product 2 does not contact the inner surface of the cylinder.

[0063] The working principle of the electrothermal conversion direct heating device 1 of the present application is as follows: when the user uses the electrothermal conversion direct heating device 1 to smoke, the user first inserts the first end sponge section 21 of the tobacco product 2 into the opening 122 of the electrothermal conversion direct heating device 1, and the user holds the second end sponge section 23 and pushes the tobacco product 2 so that the tobacco product 2 enters the heating cavity formed by the electrothermal conversion direct heating device 1 to accommodate the tobacco product 2. When the tobacco product 2 abuts against the step 123 at the closed end of the heating cavity, the tobacco product 2 is placed, and the second end sponge section 23 that has not entered the heating cavity serves as the user's mouthpiece; at this time, the middle tobacco segment 22 is just surrounded by the cylindrical hole or the runway cylindrical hole where the electrothermal conversion element 11 of the electrothermal conversion direct heating device 1 is located. At this time, since the tobacco product 2 is deformed after being squeezed by the opening 122 and the protrusion 125, the outer surface of the tobacco segment 22 is in close contact with most of the inner surface of the cylindrical hole or the runway cylindrical hole, and the multiple grooves formed on the outer surface of the tobacco product 2 are not in contact with the inner surface of the cylindrical hole or the runway cylindrical hole.

[0064] 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 11 starts 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 11 in real time.

[0065] After the middle tobacco shreds 22 are heated to a preset time, the main control module of the smoking device detects that the temperature of the electrothermal conversion element 11 reaches the preset temperature value, and prompts the user to smoke. The user then inhales from the second end sponge segment 23 as a mouthpiece. At this time, since the protrusion 125 at the opening 122 clamps the second end sponge segment 23, the tobacco product 2 will not be taken out of the heating cavity when inhaling. In addition, due to the closed structure at one end of the heating cavity, the first end sponge segment 21 abuts against the closed end step 123 of the heating cavity to form a ventilation chamber 4. When inhaling, Figure 4The arrows of air flow indicate that the air flows from the opening 122 along the groove formed by the protrusion 125 of the tobacco product 2 to the ventilation chamber 4. The air in the ventilation chamber 4 passes through the first end sponge section 21 and the middle tobacco section 22 and is drawn out from the second end sponge section 23 under the action of suction. The air will be heated in the process of entering the ventilation chamber 4 from the opening 122. The air in the ventilation chamber 4 is always preheated, which can ensure that the internal temperature of the middle tobacco section 22 changes less. At the same time, when the air enters from the opening 122, the heat on the surface of the second end sponge section 23 near the opening 122 is brought to the ventilation chamber 4, effectively reducing the surface temperature of the second sponge section. This is conducive to solving the problem of burning the mouth and making the user's suction resistance smaller.

[0066] In some embodiments, such as Figure 8 As shown, at least one step 123 extends from one end of the closed structure of the heating cavity, such as Figure 8 There are two steps 123 in the middle, and the total cross-section of the two steps 123 is much smaller than the cross-section of the tobacco product 2, so that after the tobacco product 2 is inserted into the heating cavity, the first end sponge section 21 contacts the step 123 when it abuts against the accommodating cavity. At this time, the first end sponge section 21 and the bottom of the heating cavity form a ventilation chamber 4 to facilitate air circulation.

[0067] The electrothermal conversion direct heating device 1 of the embodiment of the present application is combined by the electrothermal conversion element 11 and the injection molded part 12 in the mold, and the heating cavity formed surrounds the tobacco segment 22 of the tobacco product 2, directly and accurately heats the tobacco product 2, and the multiple hollow cavities 121 on the outer surface of the injection molded part 12 can form an air insulation chamber, which has less heat loss than indirect heating, so that the heating speed of the tobacco segment 22 is fast, the heating efficiency is high, and the heating effect can be achieved without excessively high temperature, thereby avoiding the surface of the tobacco product 2 from being charred while the internal temperature of the tobacco segment 22 has not reached the smoking condition; and one end of the tobacco product 2 is abutted against the closed end of the heating cavity to form a ventilation chamber 4, and combined with the opening 122 to form an air circulation channel, so that the resistance to smoking the tobacco product 2 is small, and the other end of the tobacco product 2 located at the opening 122 will not burn the mouth as a suction nozzle, and the tobacco product 2 is clamped by the opening 122 of the injection molded part 12, and the tobacco product 2 will not be taken out of the heating cavity when the user sucks on the suction nozzle.

[0068] like Fig. 9 As shown, the embodiment of the present application also provides a method for preparing an integrated electrothermal conversion direct heating device for tobacco products, comprising steps S10 to S40.

[0069] 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.

[0070] In some embodiments, the manufacturing of the electrothermal conversion element may include:

[0071] Select the strip plate made of alloy material;

[0072] 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.

[0073] 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 to 3 mm, the thickness may be 0.05 mm to 1 mm, the number of turns may be 1 to 8, and the spacing between each turn may be 0 to 0.8 mm.

[0074] 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.

[0075] In some embodiments, the manufacturing of the electrothermal conversion element may include:

[0076] A tubular plate is selected, wherein the inner diameter of the tubular plate is 7.4 mm, the outer diameter is 7.8 mm, and the length is 8 mm;

[0077] The tubular plate 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.

[0078] 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 .

[0079] S20, making a mold according to the shape and size of the heating device; wherein 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 heating cavity for accommodating tobacco products, and one end of the heating cavity is provided with an opening, and the other end is a closed structure, and the inner bottom of the closed structure has at least one step;

[0080] 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 plurality of hollow cavities are formed to expose part of the outer surface of the electrothermal conversion element; taking the obtained heating device out of the mold cavity.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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:

[0085] The temperature sensor is placed close to the electrothermal conversion element, and the pins of the temperature sensor are extended from the outer surface of the injection molded part.

[0086] 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.

[0087] In some embodiments, after extending the pin of the temperature sensor from the outer surface of the injection molded part, the preparation method may further include:

[0088] The outer surface of the injection molded part is wrapped with thermal insulation cotton, thereby wrapping the conductive pins and the temperature sensor.

[0089] 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.

[0090] 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 heating cavity formed by the integrated electrothermal conversion direct heating device surrounds the tobacco segment for direct heating, and the hollow cavity can form an air insulation chamber with the thermal insulation cotton, so that the heat loss of the electrothermal conversion element is small, the heating efficiency is high, the tobacco segment is heated accurately, the heating area is large and uniform, and the heating effect can be quickly achieved without excessively high heating temperature, so that the surface of the tobacco product will not be scorched and the mouth will not be burned when smoking.

[0091] The integrated electric heat conversion direct heating device 1 for tobacco products prepared by the preparation method of the present application has been found through experiments:

[0092] The integrated electric heat conversion direct heating device 1 heats the tobacco product 2 for 20 seconds to reach the preset temperature, and the tobacco segment 22 reaches the state of generating aerosol. The preset temperature is lower than 260°C. After 20 seconds, the aerosol state can be continuously generated by maintaining a temperature lower than 200°C. The current heating device usually needs to be heated to above 300°C for 25 seconds to reach the state of generating aerosol. In comparison, the present application has a fast heating speed, small heat loss, high heating efficiency, and a large and uniform heating area of ​​the tobacco product.

[0093] The above is only the preferred embodiment 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 electric heat conversion direct heating device for tobacco products, the integrated electric heat 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, which is a combination of the electrothermal conversion element and the injection molded part through in-mold injection, wherein the injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection process; The inner side wall of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and form a heating cavity 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; the injection molded part has more than one hollow cavity, which is used to expose part of the outer surface of the electrothermal conversion element; One end of the injection molded part is provided with an opening, and the other end is a closed structure; the inner bottom of the closed structure has at least one step for limiting the position of the tobacco product; Among them, one end of the tobacco product extends into the heating cavity from the opening and abuts against the step to form a ventilation chamber; the other end of the tobacco product extends from the opening as a suction nozzle, the tobacco product is clamped through the opening, and is directly heated by the electrothermal conversion element.

2. The integrated electric heat conversion direct heating device according to claim 1 is characterized in that: The outer surfaces of both ends of the injection molded part are provided with limit platforms, and the hollow cavity is located between the two limit platforms; thermal insulation cotton is wrapped between the two limit platforms, and the thermal insulation cotton and the hollow cavity form an air insulation chamber.

3. The integrated electric heat conversion direct heating device according to claim 2 is 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 wall 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.

4. The integrated electric heat conversion direct heating device according to claim 3 is characterized in that: The shape of the spiral coil is a circle or a racetrack circle, so that the shape of the inner surface of the spiral coil is a cylindrical hole or a racetrack cylindrical hole.

5. The integrated electric heat conversion direct heating device according to claim 4 is characterized in that: The area between the two limit platforms is a heat preservation area, the inner surface of the heat preservation area forms a cylinder, the height of the cylinder is greater than or equal to the height of the cylindrical hole or the height of the runway cylindrical hole, and the depth of the heating cavity is greater than the height of the cylinder.

6. The integrated electric heat conversion direct heating device according to claim 5, characterized in that: At least two grooves are provided between the inner surface of the column and the outer surface of the tobacco product, and the opening, the grooves and the ventilation chamber form an air convection channel.

7. The integrated electric heat conversion direct heating device according to claim 6, characterized in that: At least two protrusions are arranged at the opening toward the center of the opening, and the tobacco product can be squeezed and deformed by the protrusions to form the groove when extending into the heating cavity.

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

9. The integrated electric heat conversion direct heating device according to claim 1, characterized in that: The total cross-section of all the steps is smaller than the cross-section of the tobacco product, so that after the tobacco product is inserted into the heating cavity, the tobacco product abuts against the steps to form the ventilation chamber.

10. 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; wherein the heating device includes an electrothermal conversion element and an injection molded part, the inner side wall of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, forming a heating cavity for accommodating tobacco products, and one end of the heating cavity is provided with an opening, and the other end is a closed structure, and the inner bottom of the closed structure has at least one step; The electrothermal conversion element is fixed in the mold cavity, 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 has a plurality of hollow cavities for exposing a portion of the outer surface of the electrothermal conversion element; and the obtained heating device is taken out from the mold cavity; 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.

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