Electro-thermal conversion direct heating device for tobacco products

Abstract

The invention discloses an electro-thermal conversion direct heating device for tobacco products. The heating device comprises a heating device, a neck part and a positioning seat which are integrally formed, and one end of the tobacco product is inserted from an opening of the neck part, penetrates through a through hole formed by the heating device, extends into the positioning seat and abuts against a step in the positioning seat to form a ventilation bin; 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 neck part and directly heated through the electric heating conversion element. The cut tobacco sections are directly heated in a surrounding mode through the through holes formed in the heating device, and the hollow cavity and the heat preservation cotton can form an air heat insulation bin, so that the electric heating conversion element is small in heat loss, high in temperature rising speed and high in heating efficiency, the cut tobacco sections are accurately heated, the heating area is large and uniform, and the heating effect can be rapidly achieved without too high heating temperature; and the structure is flexible and changeable, so that the device can adapt to different tobacco products, and the problem of mouth scalding is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of harmless smoking, and in particular to an electrothermal 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 electric heat conversion direct heating device for tobacco products 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] The present application provides an electrothermal conversion direct heating device for tobacco products, wherein the electrothermal conversion direct heating device is configured to heat tobacco products to generate aerosol, and the electrothermal conversion direct heating device comprises:

[0007] An integrally formed heating device, the heating device comprising an electrothermal conversion element and an injection molded part, is a combination of the electrothermal conversion element and the injection molded part by in-mold injection, the injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process; the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating the tobacco product; both ends of the electrothermal conversion element are exposed on the outer surface of the injection molded part for connecting external conductive pins; the heating device has more than one hollow cavity for forming an air insulation chamber;

[0008] A neck part, wherein the neck part is a hollow structure, one end of the neck part is connected to one end of the injection molded part, and the other end of the neck part is provided with an opening;

[0009] A positioning seat, one end of which is an open structure and the other end is a closed structure; the open structure at one end of the positioning seat is connected to the other end of the injection molded part; the inner bottom of the closed structure of the positioning seat has at least one step for limiting the position of the tobacco product;

[0010] Among them, one end of the tobacco product is inserted from the opening of the neck part, passes through the through hole and extends into the positioning seat, 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 by the neck part, and is directly heated by the electrothermal conversion element.

[0011] In some embodiments, insulation rings are placed at both ends of the heating device, and the insulation rings are integrated with one end of the neck piece and one end of the positioning seat opening structure to form a accommodating cavity for placing tobacco products, and the tobacco products extend from the opening at the other end of the neck piece.

[0012] 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.

[0013] In some embodiments, the spiral coil is in the shape of a circle or a racetrack circle, so that the through hole is in the shape of a cylindrical hole or a racetrack cylindrical hole.

[0014] In some embodiments, there are at least two grooves between the inner surface of the through hole and the outer surface of the tobacco product, and the opening of the neck piece, the grooves and the ventilation chamber form an air circulation channel.

[0015] In some embodiments, the internal shape of the opening of the neck piece matches the shape of the through hole, and at least two protrusions are provided at the opening toward the center of the opening, and the tobacco product can be deformed by being squeezed by the protrusions to form the groove when passing through the through hole.

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

[0017] In some embodiments, the electric heat conversion direct heating device also includes thermal insulation cotton, which wraps the outer surface of the injection molded part, and the thermal insulation cotton and the hollow cavity form an air insulation chamber.

[0018] In some embodiments, a plurality of the hollow cavities are evenly distributed around the injection-molded part, the thermal insulation cotton wraps the outer surface of the injection-molded part, and the hollow cavities and the thermal insulation cotton form an air insulation chamber.

[0019] Implementing one of the above-mentioned technical solutions of the present application has the following advantages or beneficial effects: an electrothermal conversion direct heating device of the present application includes a heating device, a neck part and a positioning seat, which is combined into a heating device through the electrothermal conversion element and the injection molded part through in-mold injection molding, and the formed through hole surrounds the tobacco segment of the tobacco product, directly and accurately heats the tobacco product, and the heating area of ​​the tobacco product is large and uniform. The multiple hollow cavities on the outer surface of the heating device can form an air insulation chamber, which has less heat loss than indirect heating, so that the heating speed of the tobacco segment is fast, the heating efficiency is high, and the heating effect can be achieved without excessively high temperature, avoiding the surface of the tobacco product from being burned while the internal temperature of the tobacco segment has not reached the smoking condition; and one end of the tobacco product abuts against the closed end of the accommodating cavity to form a ventilation chamber, and an air circulation channel is formed in combination with the opening, 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 neck part, and the tobacco product will not be brought out of the through hole when the user sucks on the suction nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1 is a schematic structural diagram of an electrothermal conversion direct heating device involved in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the structure of the electrothermal conversion direct heating device involved in the embodiment of the present application after being inserted into a tobacco product;

[0023] Figure 3 yes Figure 2 Exploded diagram of

[0024] Figure 4 is a first structural diagram of an injection molded part involved in an embodiment of the present application;

[0025] Figure 5is a second structural diagram of the injection molded part involved in the embodiment of the present application;

[0026] Figure 6 yes Figure 2 A cross-sectional view of

[0027] Figure 7 is a structural schematic diagram of an electrothermal conversion element involved in an embodiment of the present application including a plurality of coils;

[0028] Figure 8 is another structural schematic diagram of an electrothermal conversion element according to an embodiment of the present application including a plurality of coils;

[0029] Fig. 9 is a schematic diagram of the structure of the electrothermal conversion direct heating device involved in the embodiment of the present application from a top view;

[0030] In the figure: 1. direct heating device for electrothermal conversion; 2. tobacco products; 3. conductive pins; 5. temperature sensor; 6. ventilation chamber; 11. heating device; 12. neck piece; 13 positioning seat; 14. heat insulation ring; 15. thermal insulation cotton; 21. first end sponge section; 22 tobacco section; 23 second end sponge section; 51. pin of temperature sensor; 111. electrothermal conversion element; 112. injection molded part; 113. through hole; 114. hollow cavity; 115. structural gap; 116. diameter; 117. spiral coil; 118. spacing; 119. hollow channel; 121. opening; 122. protrusion; 131. step. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] like Figures 1 to 6 As shown, the present application provides an electrothermal conversion direct heating device 1 for tobacco products, which is configured to heat tobacco products 2 to generate aerosol. The electrothermal conversion direct heating device 1 includes a heating device 11, a neck piece 12, and a positioning seat 13.

[0035] Among them, the heating device 11 includes an electrothermal conversion element 111 and an injection molded part 112. The heating device 11 is a combination of the electrothermal conversion element 111 and the injection molded part 112 through in-mold injection. The injection molded part 112 is formed and fixes the electrothermal conversion element 111 during the in-mold injection molding process; the inner surface of the injection molded part 112 is on the same curved surface as the inner surface of the electrothermal conversion element 111, and a through hole 113 is formed for accommodating the tobacco product 2; both ends of the electrothermal conversion element 111 are exposed on the outer surface of the injection molded part 112 for connecting to an external conductive pin 3; the heating device 11 has one or more hollow cavities 114 for forming an air insulation chamber.

[0036] The material of the injection molded part 112 can be a material with high temperature resistance and low thermal conductivity, such as PEEK, PI, etc. The inner surface of the injection molded part 112 and the inner surface of the electrothermal conversion element 111 are on the same curved surface, and the injection molded part 112 tightly fixes the electrothermal conversion element 111. There is no step difference between the inner surface of the injection molded part 112 and the inner surface of the electrothermal conversion element 111, so that the inner surface of the formed through hole 113 is smooth, ensuring that the tobacco product 2 remains smooth when inserted into the through hole 113, and the electrothermal conversion element 111 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 through hole 113 is easy to clean. In addition, a plurality of hollow cavities 114 are formed on the outer surface of the injection molded part 112 during in-mold injection molding to expose part of the electrothermal conversion element 111.

[0037] The neck part 12 is a hollow structure, one end of the neck part 12 is connected to one end of the injection molded part 112 , and the other end of the neck part 12 is provided with an opening 121 .

[0038] Specifically, the shape of the opening 121 at the other end of the neck member 12 matches the shape of the through hole 113, one end of the neck member 12 is connected to one end of the injection molded part 112, and the end faces of the neck member 12 and the heating device 11 do not contact each other. Furthermore, both ends of the heating device 11 are provided with heat insulating rings 14, and the heat insulating ring 14 is integrated with one end of the neck member 12, such as Figure 3 As shown, a structural gap 115 is formed between the joint surface of one end of the neck part 12 and the injection molded part 112, and the connection is achieved by the interference fit formed by the diameter 116 of the outer surface of the heating device 11 and the neck part 12. The use of such a local contact interference fit connection method can effectively reduce the contact area between the heating device 11 and the neck part 12, so as to prevent the heat of the heating device 11 from being transferred to the neck part 12.

[0039] The neck part 12 has three functions. First, the tobacco product 2 is clamped. Specifically, at least two protrusions 122 are provided at the opening 121 toward the center of the opening 121 to clamp the tobacco product 2. At the same time, the tobacco product 2 can be squeezed and deformed by the protrusions 122 when inserted, and a groove is formed when the tobacco product 2 passes through the through hole 113 for air circulation. Second, the inserted part of the tobacco product 2 is squeezed by the opening 121, and the tobacco product 2 is deformed as a whole to match the shape of the hollow channel 119 of the electrothermal conversion element 111 and fit more closely. Third, it has a heat dissipation function. The neck part 12 has a heat dissipation function. The material of 12 can be plastic or metal with good thermal conductivity such as aluminum. Combined with the heat insulation effect of the heat insulation ring 14, when part of the tobacco product 2 requires a high temperature, the second end sponge segment 23 is heated due to the effect of heat conduction and causes a mouth burn, so as to avoid a mouth burn when smoking. The metal material is used to dissipate the heat of the second end sponge segment 23. At the same time, when the opening 121, the grooves on the surface of the tobacco product 2, and the ventilation chamber 6 form air circulation, the heat on the surface of the sponge segment 23 near the opening 121 is brought to the ventilation chamber 6, effectively reducing the surface temperature of the second end sponge segment 23. It is conducive to solving the mouth burn problem and making the user's suction resistance smaller. When the user takes out the tobacco product 2, the user pinches the second end sponge segment 23 of the tobacco product 2 exposed at the opening 121 and pulls it outward, thereby pulling the tobacco product 2 out of the accommodating cavity.

[0040] The positioning seat 13 has an open structure at one end and a closed structure at the other end; the open structure at one end of the positioning seat 13 is connected to the other end of the injection molded part 112; the inner bottom of the closed structure of the positioning seat 13 has at least one step 131 for limiting the position of the tobacco product 2. Figure 4 As shown, similar to the connection between the neck member 12 and the heating device 11, the heat insulating ring 14 is integrated with one end of the opening structure of the positioning seat 13, that is, the heat insulating rings 14 at both ends of the heating device 11 are respectively integrated with one end of the neck member 12 and one end of the opening structure of the positioning seat 13, so that the end faces of the positioning seat 13 and the heating device 11 do not contact each other, and a structural gap 115 is formed on the joint surface structure between the opening structure of the positioning seat 13 and the injection molded part 112, and the connection is formed by the interference fit formed by the diameter 116 of the outer surface of the heating device 11 and the positioning seat 13. Such a local contact interference fit connection method is adopted to reduce the contact area between the heating device 11 and the positioning seat 13, so as to prevent the heat of the heating device 11 from being transferred to the positioning seat 13. The inner bottom of the closed structure of the positioning seat 13 has at least one step 131, which is used to limit the tobacco product 2; when one end of the tobacco product 2 abuts on the step 131, it forms a ventilation chamber 6 with the inner bottom of the positioning seat 13.

[0041] Specifically, the heating device 11, the neck piece 12, and the positioning seat 13, which have been assembled with the conductive pin 3, are connected into one body through a local contact interference fit connection method to form a accommodating cavity for accommodating the tobacco product 2. One end of the tobacco product 2 passes through the through hole 113 from the opening 121 of the neck piece 12 and abuts against the internal step 131 of the positioning seat 13. The tobacco product 2 and the bottom of the positioning seat 13 form a ventilation chamber 6. The tobacco segment of the tobacco product 2 is surrounded by the through hole 113. The other end of the tobacco product 2 is fixed by the neck piece 12 and extends from the opening 121 of the neck piece 12 as a suction nozzle, and is directly heated by the electrothermal conversion element 111.

[0042] 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.

[0043] In order to match the tobacco product 2, the hollow channel (such as Figure 7 or Figure 8 119) is within 6-12mm, and the length of the through hole 113 formed by the electrothermal conversion element 111 and the injection molded part 112 can be 8mm-14mm. The height of the ventilation chamber 6 is less than 2mm, and the internal length of the accommodating cavity for accommodating the tobacco product 2 formed by the heating device 11, the neck part 12 and the positioning seat 13 is 13-25mm. The tobacco product 2 is partially inserted into the accommodating cavity for placing the tobacco product 2 under the action of external force, so that the tobacco shreds 22 of the tobacco product 2 are just surrounded and wrapped by the electrothermal conversion element 111, the first end sponge segment 21 and the middle tobacco shreds 22 are completely contained in the accommodating cavity, and most of the second end sponge segment 23 is not in the accommodating cavity. The more the second end sponge segment 23 protrudes, the more conducive it is to reduce the phenomenon of burning the mouth.

[0044] The tobacco product 2 is heated in the accommodating cavity to generate aerosol, which is sucked out by the extended second end sponge section 23. Further, the air enters the ventilation chamber 6 from the opening 121 of the neck member 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, even if the tobacco shred section 22 generates aerosol when heated to generate tobacco oil, the tobacco oil cannot be absorbed by the first end sponge section 21, but will directly fall into the positioning seat 13 without flowing out, which is easy to clean.

[0045] In some embodiments, the electrothermal conversion element 111 includes one or more turns of a spiral coil 117. The shape of the spiral coil 117 can be circular or track-shaped. The inner surface of the spiral coil 117 is on the same curved surface as the inner surface of the injection molded part 112. The injection molded part 112 is combined with the spiral coil 117 by in-mold injection molding. The spiral coil 117 is fixed during the in-mold injection molding process. A spacing 118 is maintained between two adjacent spiral coils 117 to ensure that the spiral coils 117 do not contact each other. The outer surface of the spiral coil 117 is partially exposed to the hollow cavity 114 formed by the injection molded part 112.

[0046] The shape of the spiral coil 117 can be a circle or a racetrack circle, then the shape of the through hole 113 fixedly formed during the in-mold injection molding process of the spiral coil 117 is a cylindrical hole or a racetrack cylindrical hole; the through hole 113 of the cylindrical hole or the racetrack cylindrical hole is used to surround the tobacco product 2, wherein the position of the electrothermal conversion element 111 formed by the spiral coil 117 is precisely surrounded by the tobacco segment 22, and the inner surface of the through hole 113 is in contact with or mostly in contact with the outer surface of the tobacco product 2.

[0047] The material of the electrothermal conversion element 111 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.

[0048] In some embodiments, laser welding can be used to connect the two ends of the electrothermal conversion element 111 exposed on the outer surface of the injection molded part 112 on the heating device 11 to the conductive pin 3, and the conductive pin 3 is 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 111, thereby obtaining the temperature change of the electrothermal conversion element 111; if the main control module of the smoking device detects the temperature change of the electrothermal conversion element 111 through the temperature sensor 5, then the temperature sensor 5 is placed on the outer surface of the electrothermal conversion element 111 and fixed with high-temperature resistant adhesive tape. The temperature sensor 5 is used to obtain the temperature change of the electrothermal conversion element 111, and the pin 51 of the temperature sensor 5 can be electrically connected to the main control module, and the main control module obtains the temperature change of the electrothermal conversion element 111 through the temperature sensor 5.

[0049] In some embodiments, at least two grooves are provided between the inner surface of the through hole 113 and the outer surface of the tobacco product 2, and the opening 121 of the neck member 12, the grooves and the ventilation chamber 6 form an air circulation channel.

[0050] In some embodiments, the inner shape of the opening 121 of the neck member 12 matches the shape of the through hole 113, and at least two protrusions 122 are provided at the opening 121 toward the center of the opening 121, and the tobacco product 2 can be squeezed and deformed by the protrusions 122, forming a groove when passing through the through hole 113. The protrusions 122 are also used to clamp the tobacco product 2.

[0051] like Figure 7 As shown, two adjacent spiral coils 117 are separated by the injection molded part 112 , and the spacing 118 between adjacent spiral coils 117 and the inner surface of the through hole 113 are located on the same curved surface, so that the tobacco product 2 can easily pass through the through hole 113 .

[0052] like Figure 7 As shown, the spacing 118 between adjacent spiral coils 117 can be 0-0.8mm, the number of spiral coils 117 can be 1 turn or more, the cross-sectional width of the spiral coil 117 is 0.5mm-30mm, and the thickness is 0.05mm-10mm. The spiral coil 117 forms a hollow channel 119 by winding, and the inner surface of the hollow channel 119 is on the same curved surface as the inner surface of the injection molded part 112.

[0053] In some embodiments, the spiral coil 117 is in the shape of a circle or a racetrack circle, so that the through hole 113 is in the shape of a cylindrical hole or a racetrack cylindrical hole.

[0054] like Figure 7 As shown, if the shape of the spiral coil 117 is circular, the obtained hollow channel 119 is a cylindrical hole, and the shape of the through hole 113 formed by the injection molded part 112 and the spiral coil 117 is also a cylindrical hole; correspondingly, Figure 8 As shown, the shape of the spiral coil 117 is a racetrack circle, and the obtained hollow channel 119 is a racetrack cylindrical hole. Then the shape of the through hole 113 formed by the injection molded part 112 and the spiral coil 117 is also a racetrack cylindrical hole.

[0055] In some embodiments, when the through hole 113 is in the shape of a racetrack cylindrical hole, the length of the line connecting the two bends of the racetrack cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product 2, and the length of the line connecting the two straight lines of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product 2. Thus, the outer surface of the tobacco product 2 can be partially or completely in contact with the inner surface of the through hole 113, and the groove formed is actually the portion where the outer surface of the tobacco product 2 does not contact the inner surface of the through hole 113.

[0056] 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 121 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 accommodating cavity formed by the electrothermal conversion direct heating device 11 to accommodate the tobacco product 2. When the tobacco product 2 abuts against the step 131 at the closed end of the accommodating cavity, the tobacco product 2 is placed, and the second end sponge section 23 that has not entered the accommodating cavity serves as the user's suction mouth; at this time, the middle tobacco segment 22 is just surrounded by the through hole 113 where the electrothermal conversion element 111 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 121 and the protrusion 122, the outer surface of the tobacco segment is in close contact with the inner surface of the through hole 113 and most of it, and the multiple grooves formed on the outer surface of the tobacco product 2 are not in contact with the inner surface of the through hole 113.

[0057] 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 111 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 111 in real time.

[0058] 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 111 reaches the preset temperature value, and prompts the user to smoke. The user then inhales from the second sponge segment 23 as a mouthpiece. At this time, since the protrusion 122 at the opening 121 fixes the second sponge segment 23, the tobacco product 2 will not be taken out of the accommodating cavity when inhaling. In addition, due to the closed structure at one end of the accommodating cavity, the first sponge segment 21 abuts against the closed end step 131 of the accommodating cavity to form a ventilation chamber 6. When inhaling, Figure 6 As indicated by the arrow, air flows from the opening 121 along the groove formed by the protrusion 122 squeezing the tobacco product 2 to the ventilation chamber 6. The air in the ventilation chamber 6 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 6 from the opening 121. The air in the ventilation chamber 6 is always preheated, which can ensure that the internal temperature variation of the middle tobacco section 22 is small. At the same time, when the air enters from the opening 121, the heat on the surface of the second end sponge section 23 near the opening 121 is brought to the ventilation chamber 6, effectively reducing the surface temperature of the second sponge section 23. This is conducive to solving the problem of burning the mouth and making the user's suction resistance smaller.

[0059] In some embodiments, such as Fig. 9As shown, at least one step 131 extends from one end of the closed structure of the accommodating cavity, and the cross-section of the step 131 is much smaller than the cross-section of the tobacco product 2, so that after the tobacco product 2 is inserted into the accommodating cavity, the first end sponge section 21 contacts the step 131 when it abuts against the accommodating cavity. At this time, the first end sponge section 21 and the bottom of the accommodating cavity form a ventilation chamber 6 to facilitate air circulation.

[0060] In some of the embodiments, the electrothermal conversion direct heating device 1 further includes thermal insulation cotton 15 , and the thermal insulation cotton 15 wraps the outer surface of the injection molded part 112 .

[0061] The thermal insulation cotton 15 is an insulation layer, which can be made of thermal insulation cotton or thermal insulation cotton material and wrapped around the outer surface of the injection molded part 112. At this time, the hollow cavity 114 on the outer surface of the injection molded part 112 and the thermal insulation cotton 15 form an air insulation chamber, which effectively blocks the heat of the heating device 11 from being lost to its outer surface, insulates the heating device 11, and prevents heat loss as much as possible.

[0062] In some of the embodiments, a plurality of hollow cavities 114 are evenly distributed around the injection molded part 112 , the thermal insulation cotton 15 wraps the outer surface of the injection molded part 112 , and the hollow cavities 114 and the thermal insulation cotton 15 form an air insulation chamber.

[0063] like Figure 5 As shown, a plurality of hollow cavities 114 are evenly distributed at circumferential positions of the injection molded part 112, exposing a portion of the spiral coil 117. After the thermal insulation cotton 15 wraps the outer surface of the injection molded part 112, since a portion of the spiral coil 117 is exposed by the plurality of hollow cavities 114, the heat of the spiral coil 117 can be evenly distributed in the injection molded part 112 through the wrapping of the thermal insulation cotton 15. Not only is the heat not easily dissipated, but the tobacco product 2 can also be heated more evenly in the accommodating cavity.

[0064] The electrothermal conversion direct heating device 1 of the embodiment of the present application includes a heating device 11, a neck part 12 and a positioning seat 13. The heating device 11 is formed by in-mold injection molding of an electrothermal conversion element 111 and an injection molded part 112. The formed through hole 113 surrounds the tobacco segment of the tobacco product 2, directly and accurately heats the tobacco product 2, and the heating area of ​​the tobacco product 2 is large and uniform. The multiple hollow cavities 114 on the outer surface of the heating device 11 and the thermal insulation cotton 15 form an air insulation chamber, which has less heat loss than indirect heating, so that the tobacco segment is heated quickly and the heating efficiency is high. , the heating effect can be achieved without too high a temperature, thus preventing the surface of the tobacco product 2 from being scorched while the temperature inside the tobacco segment has not reached the smoking condition; and, one end of the tobacco product 2 abuts against the closed end of the accommodating cavity to form a ventilation chamber 6, which is combined with the opening 121 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 121 will not burn the mouth as a suction nozzle, and the tobacco product 2 is fixed by the neck piece 12, and will not be taken out of the through hole 113 when the user sucks on the suction nozzle.

[0065] The electric heat conversion direct heating device 1 of the present application has been found through experiments that:

[0066] The electric heat conversion direct heating device 1 heats the tobacco product 22 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 temperature is maintained below 200°C to continuously generate aerosol. 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, large and uniform heating area, and flexible structure to adapt to different tobacco products, effectively solving the problem of burning mouth.

[0067] The above description 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 subject to any

[0068] The specific embodiments disclosed herein are not limited to those described herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of this application.

Claims

1. An electrothermal conversion direct heating device for tobacco products, the electrothermal conversion direct heating device is configured to heat tobacco products to generate aerosol, characterized in that: The electrothermal conversion direct heating device comprises: An integrally formed heating device, the heating device comprising an electrothermal conversion element and an injection molded part, is a combination of the electrothermal conversion element and the injection molded part by in-mold injection, the injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process; the inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating the tobacco product; both ends of the electrothermal conversion element are exposed on the outer surface of the injection molded part for connecting external conductive pins; the heating device has more than one hollow cavity for forming an air insulation chamber; A neck part, wherein the neck part is a hollow structure, one end of the neck part is connected to one end of the injection molded part, and the other end of the neck part is provided with an opening; A positioning seat, one end of which is an open structure and the other end is a closed structure; the open structure at one end of the positioning seat is connected to the other end of the injection molded part; the inner bottom of the closed structure of the positioning seat has at least one step for limiting the position of the tobacco product; Among them, one end of the tobacco product is inserted from the opening of the neck part, passes through the through hole and extends into the positioning seat, 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 by the neck part, and is directly heated by the electrothermal conversion element.

2. The electrothermal conversion direct heating device according to claim 1, characterized in that: Insulation rings are placed at both ends of the heating device, and the insulation rings are integrated with one end of the neck piece and one end of the positioning seat opening structure to form a accommodating cavity for placing tobacco products, and the tobacco products extend from the opening at the other end of the neck piece.

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

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

5. The electrothermal conversion direct heating device according to claim 4, characterized in that: At least two grooves are provided between the inner surface of the through hole and the outer surface of the tobacco product, and the opening of the neck part, the grooves and the ventilation chamber form an air circulation channel.

6. The electrothermal conversion direct heating device according to claim 5, characterized in that: The inner shape of the opening of the neck part matches the shape of the through hole, and at least two protrusions are provided at the opening toward the center of the opening. The tobacco product can be squeezed and deformed by the protrusions to form the groove when passing through the through hole.

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

8. The electrothermal conversion direct heating device according to claim 1, characterized in that: The electric heat conversion direct heating device also includes thermal insulation cotton, which wraps the outer surface of the injection molded part, and the thermal insulation cotton and the hollow cavity form an air insulation chamber.

9. The electrothermal conversion direct heating device according to claim 8, characterized in that: A plurality of the hollow cavities are evenly distributed around the injection molded part, the thermal insulation cotton wraps the outer surface of the injection molded part, and the hollow cavities and the thermal insulation cotton form an air insulation chamber.

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