Electro-thermal conversion direct heating device for tobacco products

Abstract

The utility model discloses an electro-thermal conversion direct heating device for tobacco products. The heating device comprises a heater assembly, a neck part and a positioning seat, 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 assembly, 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 section is directly heated in a surrounding mode through the hollow channel of the electric heating conversion element, 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 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 surfaces of the tobacco products cannot be burnt, the structure is flexibly changed and can adapt to different tobacco products, and the problem of mouth burning is effectively solved.

Description

Technical Field

[0001] This application relates to the field of smoke-free technology, and more particularly to an electrothermal conversion direct heating device for tobacco products. Background Technology

[0002] Currently, there are generally two methods for heating tobacco products in smoking devices. One method involves embedding a metal plate inside the tobacco shreds, which is then heated using electromagnetic induction technology. However, the metal plate is usually small, limiting the heating area of ​​the tobacco shreds and resulting in insufficient heating. Furthermore, this method only works with tobacco products containing the metal plate.

[0003] Another method involves placing the tobacco product inside a heat-conducting shell, with a heating material surrounding the shell. Heat is transferred to the shell via this material, which then heats the tobacco product indirectly. However, this method requires higher temperatures, results in greater heat loss from the heating material, slow heating of the tobacco product, inaccurate temperature control of the heating material, and a hot mouthpiece. Summary of the Invention

[0004] The purpose of this application is to provide an electrothermal conversion direct heating device for tobacco products, to solve the technical problems existing in the prior art, such as insufficient heating of tobacco, slow heating speed, hot mouthpiece, and high heat loss. The various technical effects of the optional technical solutions provided in this application are detailed below.

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

[0006] This application provides an electrothermal conversion direct heating device for tobacco products, the electrothermal conversion direct heating device being configured to heat tobacco products to generate aerosol, the electrothermal conversion direct heating device comprising:

[0007] The neck component is a hollow structure, with one end of the neck component connected to one end of the heating assembly, and the other end of the neck component having an opening.

[0008] The positioning seat 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 is connected to the other end of the heating assembly; the inner bottom of the closed structure of the positioning seat has at least one step for limiting the tobacco product.

[0009] The heating assembly has one or more hollow cavities for forming an air insulation chamber; the heating assembly includes an electrothermal conversion element and an injection molded part assembled together; a portion of the outer surface of the electrothermal conversion element is exposed on the outer surface of the injection molded part, and external conductive pins are welded to the outer surface of the electrothermal conversion element;

[0010] The injection molded part includes an upper cover and a lower cover. The upper cover and the lower cover are assembled to fix the electrothermal conversion element. The inner surface of the electrothermal conversion element has a hollow channel for accommodating tobacco products. The two ends of the electrothermal conversion element are fixed by the mating surface of the upper cover and the lower cover.

[0011] In some embodiments, the mating surface of the upper cover and the lower cover is provided with a positioning post, and the mating surface of the lower cover and the upper cover is provided with a positioning hole adapted to the positioning post. Through the interference fit between the positioning post and the positioning hole, the electrothermal conversion element is fixed in the through hole of the injection molded part after the upper cover and the lower cover are assembled.

[0012] In some embodiments, there are two positioning posts and two positioning holes. The two positioning posts are distributed on the diagonal of the mating surface of the upper cover, and the two positioning holes are distributed on the diagonal of the mating surface of the lower cover.

[0013] In some embodiments, one end of the neck member and one end of the positioning seat are provided with a diameter, the diameter is interference-fitted with the outer surfaces of both ends of the injection molded part, both ends of the injection molded part are fixedly connected to one end of the neck member and one end of the positioning seat respectively, the outer surfaces of both ends of the injection molded part are in partial contact with the inner surfaces of one end of the neck member and one end of the positioning seat respectively, and structural gaps are formed between the mating surfaces of both ends of the injection molded part and the mating surfaces of one end of the neck member and one end of the positioning seat respectively.

[0014] In some embodiments, heat insulation rings are placed at both ends of the heating assembly. The heat insulation rings are integrated with one end of the neck member and one end of the positioning seat opening structure to form a receiving cavity for placing the tobacco product, and the tobacco product extends from the opening at the other end of the neck member.

[0015] In some embodiments, the electrothermal conversion element includes one or more spiral coils, the inner surfaces of which are on the same curved surface; a distance is maintained between two adjacent spiral coils, and the outer surface portion of the spiral coil is exposed in the hollow cavity.

[0016] In some embodiments, the internal shape of the opening of the neck member matches the shape of the through hole of the injection molded part, and at least two protrusions are provided at the opening toward the center position of the opening, so that the tobacco product can be deformed by the protrusions and form a groove when passing through the through hole.

[0017] In some embodiments, the hollow channel is shaped like a cylindrical hole or a runway cylindrical hole. When the hollow channel is shaped like 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 sections of the runway cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.

[0018] In some embodiments, the electrothermal conversion direct heating device further 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.

[0019] In some embodiments, a plurality of the hollow cavities are evenly distributed around the circumference of 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.

[0020] Implementing one of the above-mentioned technical solutions of this application has the following advantages or beneficial effects: An electrothermal conversion direct heating device of this application includes a neck piece, a positioning seat, and a heating assembly. The electrothermal conversion element is fixed during assembly via an upper and lower cover. The hollow channel of the electrothermal conversion element surrounds the tobacco shreds of the tobacco product, directly and precisely heating the tobacco product. The heated area of ​​the tobacco product is large and uniform. Multiple hollow cavities on the outer surface of the heating assembly can form an air insulation chamber, resulting in less heat loss compared to indirect heating. This allows for faster heating of the tobacco shreds and higher heating efficiency, achieving the heating effect without requiring excessively high temperatures, thus preventing the surface of the tobacco product from burning before the internal temperature of the tobacco shreds reaches the smoking point. Furthermore, one end of the tobacco product abuts against the closed end of the receiving cavity to form a ventilation chamber, which, combined with the opening, forms an air circulation channel. This reduces resistance when smoking the tobacco product, and the other end of the tobacco product at the opening serves as the mouthpiece, preventing burns. The tobacco product is secured by the neck piece, preventing it from being pulled out of the through-hole when the user inhales through the mouthpiece. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1This is a schematic diagram of the structure of the electrothermal conversion direct heating device involved in the embodiments of this application;

[0023] Figure 2 This is a schematic diagram of the structure of the electrothermal conversion direct heating device involved in the embodiments of this application after it is inserted into a tobacco product;

[0024] Figure 3 yes Figure 2 Exploded view;

[0025] Figure 4 This is a structural diagram of the positioning seat involved in the embodiments of this application;

[0026] Figure 5 This is a structural diagram of the injection molded part involved in the embodiments of this application;

[0027] Figure 6 This is a schematic diagram of the electrothermal conversion direct heating device involved in the embodiments of this application without the installation of insulation cotton and external conductive pins;

[0028] Figure 7 yes Figure 2 A sectional view;

[0029] Figure 8 This is a schematic diagram of the structure of the electrothermal conversion element involving multiple coils in the embodiments of this application;

[0030] Figure 9 This is another schematic diagram of the electrothermal conversion element involving multiple coils in the embodiments of this application;

[0031] In the diagram: 1. Electrothermal conversion direct heating device; 2. Tobacco product; 3. Conductive pin; 5. Temperature sensor; 6. Ventilation chamber; 11. Heating assembly; 12. Neck piece; 13. Positioning seat; 14. Heat insulation ring; 15. Insulation cotton; 21. First end sponge segment; 22. Tobacco shred segment; 23. Second end sponge segment; 51. Temperature sensor pin; 111. Electrothermal conversion element; 112. Injection molded part; 1121. Top cover; 1122. Bottom cover; 113. Through hole; 114. Hollow cavity; 115. Structural gap; 117. Spiral coil; 118. Spacing; 119. Hollow channel; 121. Opening; 122. Protrusion; 123. Neck piece diameter; 131. Step; 132. Positioning seat diameter. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, various exemplary embodiments described below will be referenced to the accompanying drawings, which form part of the exemplary embodiments and depict various exemplary embodiments that may be adopted to implement this application. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. It should be understood that they are merely examples of processes, methods, and apparatuses consistent with some aspects of this application disclosed as detailed in the appended claims, and other embodiments may be used, or structural and functional modifications may be made to the embodiments listed herein without departing from the scope and spirit of this application.

[0033] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," etc., indicate the orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the referred element must have a specific orientation, or be constructed and operated in a specific orientation. The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. The term "multiple" means two or more. The terms "connected" and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, communication connections, direct connections, indirect connections 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 of the related listed items. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] To illustrate the technical solutions described in this application, specific embodiments are provided below, showing only the parts related to the embodiments of this application.

[0035] like Figures 1 to 9 As shown, this application provides an electrothermal conversion direct heating device 1 for tobacco products, configured to heat tobacco products 2 to generate aerosol. The electrothermal conversion direct heating device 1 includes a heating assembly 11, a neck member 12, and a positioning seat 13.

[0036] The neck component 12 is a hollow structure. One end of the neck component 12 is connected to one end of the heating assembly 11, and the other end of the neck component 12 is provided with an opening 121.

[0037] Specifically, the shape of the opening 121 at the other end of the neck member 12 matches the shape of the through hole 113 of the injection molded part 112 of the heating assembly 11. One end of the neck member 12 is connected to one end of the heating assembly 11, and the end faces of the neck member 12 and the heating assembly 11 do not contact each other. Furthermore, heat insulation rings 14 are placed at both ends of the heating assembly 11, and the heat insulation rings 14 are integrated with one end of the neck member 12. Figure 3 As shown, a structural gap 115 is formed between one end of the neck component 12 and the mating surface of the heating assembly 11. The gap is connected by an interference fit between the outer surfaces of both ends of the injection molded part 112 of the heating assembly 11 and the inner surface of one end of the neck component 12 and the inner surface of one end of the positioning seat 13. This partial contact interference fit connection method effectively reduces the contact area between the heating assembly 11, the neck component 12 and the positioning seat 13, so as to prevent the heat of the heating assembly 11 from being conducted to the neck component 12 and the positioning seat 13.

[0038] The neck component 12 has three functions: first, it secures the tobacco product 2; specifically, at least two protrusions 122 are provided at the center of the opening 121 to secure the tobacco product 2. Simultaneously, when the tobacco product 2 is inserted, it is deformed by the protrusions 122, forming a groove in the through hole 113 for air circulation; second, the inserted portion of the tobacco product 2 is compressed by the opening 121, and after the overall deformation of the tobacco product 2, it matches the shape of the hollow channel 119 of the electrothermal conversion element 111, allowing for a tighter fit; third, it has a heat dissipation function. The material of component 12 can be plastic or a metal with good thermal conductivity, such as aluminum. Combined with the heat insulation effect of the heat insulation ring 14, when a portion of the tobacco product 2 requires a high temperature, the second end sponge segment 23 is heated due to heat conduction, causing it to scald the mouth. To prevent scalding during inhalation, a metal material is used to dissipate heat from the second end sponge segment 23. Simultaneously, when air circulates through the opening 121, the groove on the surface of the tobacco product 2, and the ventilation chamber 6, the heat from the surface of the sponge segment 23 near the opening 121 is carried into the ventilation chamber 6, effectively reducing the surface temperature of the second end sponge segment 23. This helps solve the problem of scalding the mouth and also reduces the user's inhalation resistance. When the user removes the tobacco product 2, the user pinches the second end sponge segment 23 exposed at the opening 121 and pulls it outward, thereby removing the tobacco product 2 from the receiving cavity.

[0039] 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 heating assembly 11; the inner bottom of the closed structure of the positioning seat 13 has at least one step 131 for limiting the tobacco product 2. Figure 4As shown, similar to the connection between the neck piece 12 and the heating assembly 11, the heat insulation ring 14 is integrated with one end of the opening structure of the positioning seat 13. That is, the heat insulation rings 14 at both ends of the heating assembly 11 are integrated with one end of the neck piece 12 and one end of the opening structure of the positioning seat 13, respectively, so that the end faces of the positioning seat 13, the neck piece 12 and the heating assembly 11 do not contact each other. A structural gap 115 is formed on the mating surface structure between the opening structure of the positioning seat 13 and the neck piece 12 and the injection molded part 112. The gap 115 is located on the outer surface of one end of the heating assembly 11. The heating assembly 11 and the positioning seat 13 are connected by an interference fit formed by the diameter 132 of the inner surface of one end of the positioning seat 13. This partial contact interference fit connection reduces the contact area between the heating assembly 11 and the positioning seat 13 and the neck part 12. The purpose is to prevent the heat of the heating assembly 11 from being conducted to the positioning seat 13 and the neck part 12. The inner bottom of the closed structure of the positioning seat 13 has at least one step 131 for limiting the tobacco product 2. When one end of the tobacco product 2 abuts against the step 131, it forms a ventilation chamber 6 with the inner bottom of the positioning seat 13.

[0040] The heating assembly 11 has one or more hollow cavities 114 for forming an air insulation chamber; the heating assembly 11 includes an electrothermal conversion element 111 and an injection molded part 112 that are assembled together; a portion of the outer surface of the electrothermal conversion element 111 is exposed on the outer surface of the injection molded part 112, and external conductive pins 3 are welded to the outer surface of the electrothermal conversion element 111.

[0041] The injection molded part 112 includes an upper cover 1121 and a lower cover 1122. The upper cover 1121 and the lower cover 1122 can be made of a material with low thermal conductivity and high temperature resistance, such as PEEK or PI. The upper cover 1121 and the lower cover 1122 fix the electrothermal conversion element 111 by assembly. The inner surface of the electrothermal conversion element 111 has a hollow channel 119 for accommodating the tobacco product 2. The two ends of the electrothermal conversion element 111 are fixed by the mating surface of the upper cover 1121 and the lower cover 1122.

[0042] During assembly, the upper cover 1121 and lower cover 1122 fix the heating conversion element 111, ensuring that the injection molded part 112 formed by the upper cover 1121 and lower cover 1122 tightly secures the heating conversion element 111. This fixes the heating conversion element 111 within the through hole 113 of the injection molded part 112. Because the heating conversion element 111 is fixed by the upper cover 1121 and lower cover 1122, its inner surface is smooth without any breaks, ensuring smooth insertion of the tobacco product 2 into the hollow channel 119 and preventing displacement of the heating conversion element 111. When the tobacco shreds 22 of the tobacco product 2 are heated to generate aerosol, potentially producing tar, the smooth inner surface of the hollow channel 119 facilitates cleaning. Furthermore, multiple hollow cavities 114 are formed on the outer surface of the injection molded part 112 to expose portions of the heating conversion element 111.

[0043] After the upper cover 1121 and the lower cover 1122 are assembled to fix the electrothermal conversion element 111, external conductive pins 3 are welded to both ends of the electrothermal conversion element 111 that are exposed on the outer surface of the injection molded part 112. Then, the heating assembly 11, the neck part 12, and the positioning seat 13, which have been assembled with conductive pins 3, are connected into one body by a partial contact interference fit to form a receiving cavity for accommodating the tobacco product 2. One end of the tobacco product 2 passes through the hollow channel 119 from the opening 121 of the neck part 12 and abuts against the inner step 131 of the positioning seat 13. The tobacco product 2 and the bottom of the positioning seat 13 form an air exchange chamber 6. The tobacco section of the tobacco product 2 is surrounded by the hollow channel 119. The other end of the tobacco product 2 is fixed by the neck part 12 and extends out from the opening 121 of the neck part 12 as a mouthpiece, and is directly heated by the electrothermal conversion element 111.

[0044] In some embodiments, tobacco product 2, such as Figure 3 As shown, the tobacco product 2 is cylindrical with a length of 45mm and consists of three parts: a first end sponge segment 21, a middle tobacco shred segment 22, and a second end sponge segment 23. For example, the length of the first end sponge segment 21 is 5mm, the length of the middle tobacco shred segment 22 is 12mm, and the length of the second end sponge segment 23 is 28mm.

[0045] To match the tobacco product 2, the length of the hollow channel 119 formed by the electrothermal conversion element 111 is within 6-12mm, and the length of the through hole 113 of 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 receiving cavity for accommodating the tobacco product 2 formed by the heating assembly 11, the neck part 12, and the positioning seat 13 is 13-25mm. Under the action of external force, the tobacco product 2 is partially inserted into the receiving cavity, so that the tobacco section 22 of the tobacco product 2 is just surrounded and wrapped by the electrothermal conversion element 111. The first end sponge section 21 and the middle tobacco section 22 are completely contained in the receiving cavity, while most of the second end sponge section 23 is not contained in the receiving cavity. The more the second end sponge section 23 protrudes, the more beneficial it is to reduce the burning sensation of the mouth.

[0046] After the tobacco product 2 is heated within the receiving cavity, it generates an aerosol, which is drawn out by the extended second-end sponge segment 23. Further, air enters the ventilation chamber 6 through the opening 121 of the neck piece 12, then enters through the first-end sponge segment 21, passes through the intermediate tobacco section 22, and is drawn out through the second-end sponge segment 23. Even if the intermediate tobacco section 22 generates e-liquid during heating, the e-liquid cannot be absorbed by the first-end sponge segment 21 and will fall directly into the positioning seat 13 without overflowing, making it easy to clean.

[0047] In some embodiments, the mating surface of the upper cover 1121 and the lower cover 1122 is provided with a positioning post 1123. The positioning post 1123 can be a cylindrical protrusion. The mating surface of the lower cover 1122 and the upper cover 1121 has a positioning hole 1124 that matches the positioning post 1123. The positioning hole 1124 can be a cylindrical hole corresponding to the cylindrical protrusion. The diameter of the cylindrical protrusion can be slightly larger than the diameter of the cylindrical hole. The cylindrical protrusion is inserted into the cylindrical hole by pressure to achieve an interference fit. Through the interference fit between the positioning post 1123 and the positioning hole 1124, the electrothermal conversion element 111 is fixed in the through hole 113 of the injection molded part 112 after the upper cover 1121 and the lower cover 1122 are assembled.

[0048] In some embodiments, there are two positioning posts 1123 and two positioning holes 1124. The two positioning posts 1123 are located at the diagonal position of the mating surface of the upper cover 1121, and the two positioning holes 1124 are located at the diagonal position of the mating surface of the lower cover 1122.

[0049] Specifically, the upper cover 1121 and the lower cover 1122 are both arc-shaped and have matching curvatures. When combined, they form a complete cylindrical injection molded part 112. Positioning posts 1123 are designed along the diagonal direction of the edge of the arc-shaped upper cover 1121, and corresponding positioning holes 1124 are designed along the diagonal direction of the edge of the arc-shaped lower cover 1122, so that the upper cover 1121 and the lower cover 1122 can be tightly joined together.

[0050] In some embodiments, the electrothermal conversion element 111 includes one or more spiral coils 117, which can be circular or racetrack-shaped, with the inner surfaces of the spiral coils 117 on the same curved surface. The upper cover 1121 and the lower cover 1122 fix the spiral coils 117 by assembly, so that a distance 118 is maintained between two adjacent spiral coils 117 to ensure that the spiral coils 117 do not contact each other, and the outer surface of the spiral coils 117 is exposed in the hollow cavity 114 of the injection molded part 112.

[0051] The spiral coil 117 can be circular or raceway-shaped. The hollow channel 119, which is fixed during the assembly of the upper cover 1121 and the lower cover 1122, is cylindrical or raceway-shaped. The hollow channel 119 with cylindrical or raceway-shaped hole is used to surround the tobacco product 2. The position of the electrothermal conversion element 111 formed by the spiral coil 117 is precisely surrounded by the tobacco section 22. The inner surface of the hollow channel 119 is in contact with or in most contact with the outer surface of the tobacco product 2.

[0052] The electrothermal conversion element 111 can be made of an alloy of at least two of the following: nickel, chromium, iron, copper, molybdenum, manganese, silver, silicon, antimony, sulfur, and phosphorus, and has a temperature coefficient.

[0053] 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 assembly 11 to the conductive pins 3. 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 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. The pins 51 of the temperature sensor 5 can be electrically connected to the main control module. The main control module obtains the temperature change of the electrothermal conversion element 111 through the temperature sensor 5.

[0054] In some embodiments, the inner surface of the hollow channel 119 has at least two grooves between the inner surface of the tobacco product 2 and the outer surface of the hollow channel 119, and the opening 121 of the neck piece 12, the grooves and the ventilation chamber 6 form an air circulation channel.

[0055] In some embodiments, the internal shape of the opening 121 of the neck member 12 matches the shape of the through hole 113 of the injection molded part 112, and at least two protrusions 122 are provided at the center of the opening 121. The tobacco product 2 can be deformed by being squeezed 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.

[0056] like Figure 8 As shown, the interval between two adjacent spiral coils 117 is fixed by the injection molding part 112, and the spacing between adjacent spiral coils 117 is maintained at 118, so that the tobacco product 2 can be easily penetrated through the hollow channel 119.

[0057] like Figure 9 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, the thickness is 0.05mm-10mm, and the spiral coil 117 forms a hollow channel 119 by winding.

[0058] In some embodiments, the spiral coil 117 is circular or raceway-shaped, so that the hollow channel 119 is cylindrical or raceway-shaped.

[0059] like Figure 8As shown, if the spiral coil 117 is circular, the resulting hollow channel 119 is a cylindrical hole, and the spiral coil 117 fixed by the injection molded part 112 is also a cylindrical hole; correspondingly, as Figure 8 As shown, the spiral coil 117 is shaped like a racetrack circle, and the resulting hollow channel 119 is a racetrack cylindrical hole. The spiral coil 117 is fixed by the injection molded part 112 in the same shape as a racetrack cylindrical hole.

[0060] In some embodiments, when the hollow channel 119 is shaped like 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 2, and the length of the line connecting the two straight sections of the runway cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product 2. This allows the outer surface of the tobacco product 2 to partially or completely contact the inner surface of the hollow channel 119, so the formed groove is actually the portion where the outer surface of the tobacco product 2 does not contact the inner surface of the hollow channel 119.

[0061] The working principle of the electrothermal conversion direct heating device 1 of this application is as follows: When the user smokes using the electrothermal conversion direct heating device 1, the first end sponge segment 21 of the tobacco product 2 is first inserted into the opening 121 of the electrothermal conversion direct heating device 1. The user holds the second end sponge segment 23 and pushes the tobacco product 2 into the receiving cavity formed by the electrothermal conversion direct heating device 11 to receive the tobacco product 2. When the tobacco product 2 comes into contact with the step 131 at the closed end of the receiving cavity, the tobacco product 2 is placed. The second end sponge segment 23 that has not entered the receiving cavity serves as the user's mouthpiece. At this time, the middle tobacco segment 22 is just around the hollow channel 119 of the electrothermal conversion element 111 of the electrothermal conversion direct heating device 1. At this time, due to the deformation caused by the opening 121 and the protrusion 122, the outer surface of the tobacco segment is in close contact with most of the inner surface of the hollow channel 119. The multiple grooves formed on the outer surface of the tobacco product 2 are not in contact with the inner surface of the hollow channel 119.

[0062] 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 section 22. At the same time, the main control module of the smoking device detects the temperature change of the electrothermal conversion element 111 in real time.

[0063] After heating the middle tobacco section 22 to a preset time, the main control module of the smoking device detects that the temperature of the electrothermal conversion element 111 has reached the preset temperature value and prompts the user to smoke. The user then inhales through the second end sponge section 23, which serves as the mouthpiece. At this time, because the protrusion 122 at the opening 121 fixes the second end sponge section 23, the tobacco product 2 will not be carried out of the receiving cavity during inhalation. Furthermore, due to the closed structure at one end of the receiving cavity, the first end sponge section 21 abuts against the closed end step 131 of the receiving cavity, forming a ventilation chamber 6. During inhalation, if... Figure 7 As indicated by the arrow, air flows from the opening 121 along the groove formed by the protrusion 122 on the tobacco product 2 into the ventilation chamber 6. The air in the ventilation chamber 6 passes through the first end sponge section 21, then the middle tobacco section 22, and is drawn out from the second end sponge section 23 under suction. The air is heated as it enters the ventilation chamber 6 from the opening 121, ensuring that the air in the ventilation chamber 6 is always preheated. This minimizes the temperature fluctuation inside the middle tobacco section 22. Simultaneously, when air enters from the opening 121, the heat from the surface of the second end sponge section 23 near the opening 121 is carried into the ventilation chamber 6, effectively reducing the surface temperature of the second sponge section 23. This helps solve the problem of burning the mouth and also reduces the user's inhalation resistance.

[0064] In some of these implementations, such as Figure 4 As shown, at least one step 131 extends from one end of the closed structure of the receiving cavity. The cross-section of the step 131 is much smaller than the cross-section of the tobacco product 2, so that when the tobacco product 2 is inserted into the receiving cavity, the first end sponge segment 21 comes into contact with the step 131 when it comes into contact with the receiving cavity. At this time, the first end sponge segment 21 and the bottom of the receiving cavity form an air exchange chamber 6 to facilitate air circulation.

[0065] In some embodiments, the electrothermal conversion direct heating device 1 also includes insulation cotton 15, which wraps the outer surface of the injection molded part 112.

[0066] The insulation cotton 15 is a heat insulation layer, which can be made of heat insulation cotton or heat insulation cotton material, and is 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 insulation cotton 15 form an air insulation chamber, which effectively prevents the heat of the heating assembly 11 from escaping to its outer surface, and provides heat insulation for the heating assembly 11 to minimize heat loss.

[0067] In some embodiments, a plurality of hollow cavities 114 are evenly distributed around the injection molded part 112, and the insulation cotton 15 wraps the outer surface of the injection molded part 112, forming an air insulation chamber with the hollow cavities 114 and the insulation cotton 15.

[0068] like Figure 6As shown, multiple hollow cavities 114 are evenly distributed around the injection molded part 112, exposing part of the spiral coil 117. After the outer surface of the injection molded part 112 is wrapped with heat insulation cotton 15, the heat of the spiral coil 117 can be evenly distributed in the injection molded part 112 through the wrapping of heat insulation cotton 15 because the multiple hollow cavities 114 expose part of the spiral coil 117. The heat is not easily dissipated, and the tobacco product 2 is heated more evenly in the cavity.

[0069] The electrothermal conversion direct heating device 1 of this application embodiment includes a heating assembly 11, a neck piece 12, and a positioning seat 13. The electrothermal conversion element 111 is fixed during assembly via an upper cover 1121 and a lower cover 1122. The hollow channel 119 of the electrothermal conversion element 111 surrounds the tobacco shreds of the tobacco product 2, directly and precisely heating the tobacco product 2. The heated area of ​​the tobacco product 2 is large and uniform. Multiple hollow cavities 114 on the outer surface of the heating assembly 11, together with the insulation cotton 15, form an air insulation chamber, resulting in less heat loss compared to indirect heating, thus improving the heating speed of the tobacco shreds. It is fast and has high heating efficiency, achieving the heating effect without excessively high temperatures, thus avoiding the surface of the tobacco product 2 burning before the internal temperature of the tobacco shreds reaches the smoking point. Furthermore, one end of the tobacco product 2 abuts against the closed end of the receiving cavity to form an air exchange chamber 6, which, together with the opening 121, forms an air circulation channel, resulting in low resistance when smoking the tobacco product 2. The other end of the tobacco product 2, located at the opening 121, serves as the mouthpiece and will not burn the mouth. Moreover, the tobacco product 2 is fixed by the neck piece 12, preventing it from being pulled out of the through hole 113 when the user inhales through the mouthpiece.

[0070] The electrothermal conversion direct heating device 1 of this application, through experiments, has been found to have the following properties:

[0071] The electrothermal conversion direct heating device 1 can heat the tobacco product 22 to the preset temperature in 20 seconds, and the tobacco shreds 22 will reach the state of generating aerosol. The preset temperature is below 260°C, and after 20 seconds, the temperature can be maintained below 200°C to continuously generate aerosol. Current heating devices usually need 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, less heat loss, high heating efficiency, large and uniform heating area, and flexible structure that can be adapted to different tobacco products, effectively solving the problem of burning the mouth.

[0072] The above description is merely a preferred embodiment of this application. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this application. Furthermore, under the teachings of this application, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this application. Therefore, this application is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this application.

Claims

1. An electro-thermal conversion direct heating device for a tobacco product, the electro-thermal conversion direct heating device being configured to heat a tobacco product to generate an aerosol, characterized in that, The direct electric heating conversion heating device comprises: a neck part, which is a hollow structure, one end of the neck part is connected to one end of a heating assembly, and the other end of the neck part is provided with an opening; a positioning seat, one end of the positioning seat is an open structure, and the other end is a closed structure; the open structure of one end of the positioning seat is connected to the other end of the heating assembly; the inner bottom of the closed structure of the positioning seat has at least one step for limiting the tobacco product; the heating assembly has one or more hollow cavities for forming an air insulation bin; the heating assembly comprises an electric heating conversion element and an injection molding part combined by assembly; part of the outer surface of the electric heating conversion element is exposed to the outer surface of the injection molding part, and an external conductive pin is welded to the outer surface of the electric heating conversion element; wherein the injection molding part comprises an upper cover and a lower cover, the upper cover and the lower cover fix the electric heating conversion element by assembly, and the inner surface of the electric heating conversion element has a hollow channel for accommodating the tobacco product, and the two ends of the electric heating conversion element are fixed by the combined surface of the upper cover and the lower cover after assembly.

2. The electro-thermal conversion direct heating device according to claim 1, characterized in that The combined surface of the upper cover and the lower cover is provided with a positioning column, the combined surface of the lower cover and the upper cover has a positioning hole matched with the positioning column, and the electric heating conversion element is fixed in the through hole of the injection molding part after assembly of the upper cover and the lower cover through interference fit of the positioning column and the positioning hole.

3. The electro-thermal conversion direct heating device according to claim 2, characterized in that The number of the positioning column and the positioning hole is two, the two positioning columns are distributed at the diagonal positions of the combined surface of the upper cover, and the two positioning holes are distributed at the diagonal positions of the combined surface of the lower cover.

4. The electro-thermal conversion direct heating device according to claim 1, characterized in that One end of the neck part and the inner surface of one end of the positioning seat are each provided with a radial position, the radial position is interference-fitted with the outer surface of the two ends of the injection molding part, the two ends of the injection molding part are respectively fixedly connected with one end of the neck part and one end of the positioning seat, the outer surface of the two ends of the injection molding part is respectively locally in contact with the inner surface of one end of the neck part and the inner surface of one end of the positioning seat, and the combined surface between the two ends of the injection molding part and one end of the neck part and one end of the positioning seat forms a structural gap.

5. The electro-thermal conversion direct heating device according to claim 1, characterized in that, Heat insulation rings are placed at the two ends of the heating assembly, the heat insulation rings are integrated with one end of the neck part and one end of the open structure of the positioning seat, and form a containing cavity for placing the tobacco product, and the tobacco product extends out of the opening at the other end of the neck part.

6. The electro-thermal conversion direct heating device according to claim 1, characterized in that The electric heating conversion element comprises one or more spiral coils, the inner surfaces of the spiral coils are on the same curved surface, a spacing is maintained between adjacent two spiral coils, and part of the outer surface of the spiral coil is exposed to the hollow cavity.

7. The electro-thermal conversion direct heating device according to claim 1, characterized in that The inner shape of the opening of the neck part matches the shape of the through hole of the injection molding part, and at least two protrusions are provided at the center position of the opening, the tobacco product can be deformed by being extruded by the protrusions, and a groove is formed when penetrating through the through hole.

8. The electro-thermal conversion direct heating device of claim 1, wherein, The shape of the hollow channel is a cylindrical hole or a race track cylindrical hole, when the shape of the hollow channel is the race track cylindrical hole, the length of the line connecting the two bends of the race track 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 sections of the race track cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.

9. The electro-thermal conversion direct heating device of claim 1, wherein, The direct electric heating conversion heating device further comprises heat preservation cotton, the heat preservation cotton wraps the outer surface of the injection molding part, and the heat preservation cotton and the hollow cavity form an air heat insulation bin.

10. The electro-thermal conversion direct heating device according to claim 9, characterized in that The plurality of hollow cavities are uniformly distributed at the circumferential positions of the injection molding part, the heat preservation cotton wraps the outer surface of the injection molding part, and the hollow cavities and the heat preservation cotton form an air heat insulation bin.

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