An electrically heat converted direct heating device for tobacco articles
By integrating the heating element and neck component design, the problems of insufficient heating and burning the mouth of tobacco products are solved, achieving rapid, uniform heating and low heat loss heating efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHENZHEN SHENGDING NEW MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2024-12-20
- Publication Date
- 2026-06-26
AI Technical Summary
Existing tobacco heating devices suffer from problems such as insufficient heating of tobacco, slow heating speed, hot mouthpieces, and high heat loss.
The heating element and neck part are designed as a single piece. The electrothermal conversion element and the injection molded part are combined to form a through hole and an air insulation chamber, which directly heats the tobacco product. Combined with the positioning seat and neck part, an air exchange chamber is formed to ensure uniform heating and reduce heat loss.
It enables rapid and uniform heating of tobacco products, reduces heat loss, avoids burning the mouthpiece, and improves heating efficiency and reduces suction resistance.
Smart Images
Figure CN119791345B_ABST
Abstract
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] An integrally molded heating device includes an electrothermal conversion element and an injection molded part, which are combined by in-mold injection molding. The injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process. The inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating the tobacco product. Both ends of the electrothermal conversion element are exposed on the outer surface of the injection molded part for connecting external conductive pins. The heating device has one or more hollow cavities for forming an air insulation chamber.
[0008] The neck component is a hollow structure, with one end of the neck component connected to one end of the injection molded part, and the other end of the neck component having 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 tobacco product.
[0010] One end of the tobacco product is inserted through the opening of the neck piece, passes through the through hole into the positioning seat, and abuts against the step to form an air exchange chamber; the other end of the tobacco product extends out from the opening as a mouthpiece, the tobacco product is secured by the neck piece, and is directly heated by the electrothermal conversion element.
[0011] In some embodiments, heat insulation rings are placed at both ends of the heating device. 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 out from the opening at the other end of the neck member.
[0012] In some embodiments, the electrothermal conversion element includes one or more spiral coils, 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, the spiral coil is fixed after in-mold injection molding, a distance is maintained between two adjacent spiral coils, and the outer surface portion of the spiral coil is exposed in the hollow cavity formed by the injection molded part.
[0013] In some embodiments, the spiral coil is circular or raceway-shaped, so that the through hole is cylindrical or raceway-shaped.
[0014] In some embodiments, at least two grooves are provided between the inner surface of the through hole and the outer surface of the tobacco article, 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 member matches the shape of the through hole, and the opening has at least two protrusions facing the center of the opening, so that the tobacco product can be deformed by the protrusions and form the groove when passing through the through hole.
[0016] In some embodiments, when the through hole is shaped like a racetrack cylinder hole, the length of the line connecting the two bends of the racetrack cylinder 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 racetrack cylinder is less than or equal to the cross-sectional diameter of the tobacco product.
[0017] 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.
[0018] 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.
[0019] 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 heating element, a neck component, and a positioning seat. The heating element is formed by in-mold injection molding of an electrothermal conversion element and an injection molded part. The formed through-hole 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 element can form an air insulation chamber, resulting in less heat loss than indirect heating. This allows the tobacco shreds to heat up quickly and efficiently, 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 an air exchange chamber, which, combined with the opening, forms an air circulation channel. This reduces the resistance when smoking the tobacco product, and the other end of the tobacco product located at the opening serves as the mouthpiece, preventing burns. The tobacco product is secured by the neck component, preventing it from being pulled out of the through-hole when the user inhales through the mouthpiece. Attached Figure Description
[0020] 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:
[0021] Figure 1 This is a schematic diagram of the structure of the electrothermal conversion direct heating device involved in the embodiments of this application;
[0022] 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;
[0023] Figure 3 yes Figure 2 Exploded view;
[0024] Figure 4 This is a first structural diagram of the injection molded part involved in the embodiments of this application;
[0025] Figure 5This is a second structural diagram of the injection molded part involved in the embodiments of this application;
[0026] Figure 6 yes Figure 2 A sectional view;
[0027] Figure 7 This is a schematic diagram of the structure of the electrothermal conversion element involving multiple coils in the embodiments of this application;
[0028] Figure 8 This is another schematic diagram of the electrothermal conversion element involving multiple coils in the embodiments of this application;
[0029] Figure 9 This is a top-view structural schematic diagram of the electrothermal conversion direct heating device involved in the embodiments of this application;
[0030] In the diagram: 1. Electrothermal conversion direct heating device; 2. Tobacco product; 3. Conductive pin; 5. Temperature sensor; 6. Ventilation chamber; 11. Heating device; 12. Neck part; 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; 113. Through hole; 114. Hollow cavity; 115. Structural gap; 116. Diameter; 117. Helical coil; 118. Spacing; 119. Hollow channel; 121. Opening; 122. Protrusion; 131. Step. Detailed Implementation
[0031] 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.
[0032] 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.
[0033] 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.
[0034] like Figures 1 to 6 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 element 11, a neck member 12, and a positioning seat 13.
[0035] 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 molding. 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 forms a through hole 113 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 external conductive pins 3. The heating device 11 has one or more hollow cavities 114 for forming an air insulation chamber.
[0036] The injection molded part 112 can be made of a high-temperature resistant material with low thermal conductivity, such as PEEK or PI. 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. The injection molded part 112 tightly fixes the electrothermal conversion element 111, and there is no discontinuity between the inner surfaces of the injection molded part 112 and the electrothermal conversion element 111. This ensures that the inner surface of the formed through hole 113 is smooth, guaranteeing smooth insertion of the tobacco product 2 into the through hole 113 and preventing displacement of the electrothermal 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 through hole 113 facilitates cleaning. Furthermore, multiple hollow cavities 114 are formed on the outer surface of the injection molded part 112 during in-mold injection molding to expose portions 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, heat insulation rings 14 are placed at both ends of the heating device 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 part 12 and the injection molded part 112. The neck part 12 is connected by an interference fit formed by the diameter 116 of the outer surface of the heating device 11 and the neck part 12. This local contact interference fit connection method effectively reduces the contact area between the heating device 11 and the neck part 12, and the purpose is to prevent the heat of the heating device 11 from being conducted to the neck part 12.
[0039] 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.
[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 tobacco product 2. Figure 4 As shown, similar to the connection between the neck piece 12 and the heating device 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 device 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 and the heating device 11 do not contact each other. A structural gap 115 is formed on the joint surface between the opening structure of the positioning seat 13 and the injection molded part 112. The connection is made by the interference fit formed between the diameter 116 of the outer surface of the heating device 11 and the positioning seat 13. This partial contact interference fit connection method reduces the contact area between the heating device 11 and the positioning seat 13. The purpose is to prevent the heat of the heating device 11 from being conducted to the positioning seat 13. 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.
[0041] Specifically, the heating device 11, neck piece 12, and positioning seat 13, which are equipped with conductive pins 3, are connected together 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 through hole 113 from the opening 121 of the neck piece 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 shreds of the tobacco product 2 are surrounded by the through hole 113. The other end of the tobacco product 2 is fixed by the neck piece 12 and extends out from the opening 121 of the neck piece 12 as a mouthpiece, and is directly heated by the electrothermal conversion element 111.
[0042] 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.
[0043] To match the tobacco product 2, the electrothermal conversion element 111 itself forms a hollow channel (such as...). Figure 7 or Figure 8 The length of 119) is within 6-12mm, and the length of the through hole 113 formed by the in-mold injection of 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. The internal length of the receiving 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. 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, and 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.
[0044] 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 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.
[0045] In some embodiments, the electrothermal conversion element 111 includes one or more spiral coils 117. The spiral coil 117 can be circular or raceway-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 distance 118 is maintained between two adjacent spiral coils 117 to ensure that the spiral coils 117 do not contact each other. The outer surface portion of the spiral coil 117 is exposed in the hollow cavity 114 formed by the injection molded part 112.
[0046] The spiral coil 117 can be circular or raceway-shaped. The through hole 113 formed by the spiral coil 117 during the in-mold injection molding process is cylindrical or raceway-shaped. The through hole 113 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 through hole 113 is in contact with or in most contact with the outer surface of the tobacco product 2.
[0047] 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.
[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. 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. The pin 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.
[0049] In some embodiments, the inner surface of the through hole 113 has at least two grooves between the inner surface of the tobacco product 2 and the outer surface of the through hole 113, and the opening 121 of the neck piece 12, the grooves and the ventilation chamber 6 form an air circulation channel.
[0050] In some embodiments, the internal 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 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.
[0051] like Figure 7 As shown, two adjacent spiral coils 117 are separated by an injection molded part 112. The spacing 118 between adjacent spiral coils 117 and the inner surface of the through hole 113 are on the same curved surface, making it easy for the tobacco product 2 to be penetrated 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 circular or raceway-shaped, so that the through hole 113 is cylindrical or raceway-shaped.
[0054] like Figure 7 As shown, if the spiral coil 117 is circular, the resulting hollow channel 119 is a cylindrical hole, and the through hole 113 formed by the injection molded part 112 and the spiral coil 117 is also cylindrical; 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. Therefore, the through hole 113 formed by the injection molded part 112 and the spiral coil 117 is also shaped like a racetrack cylindrical hole.
[0055] In some embodiments, when the through hole 113 is shaped like a racetrack cylindrical hole, the length of the line connecting the two bends of the racetrack cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product 2, and the length of the line connecting the two straight sections of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product 2. This allows the outer surface of the tobacco product 2 to partially or completely contact the inner surface of the through hole 113, 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 through hole 113.
[0056] 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 so that it enters the receiving cavity formed by the electrothermal conversion direct heating device 11 to receive the tobacco product 2. When the tobacco product 2 abuts against 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 shred segment 22 is just around the through hole 113 where the electrothermal conversion element 111 of the electrothermal conversion direct heating device 1 is located. At this time, the tobacco product 2 is deformed after being squeezed by the opening 121 and the protrusion 122, so that the outer surface of the tobacco shred segment is in close contact with most of the inner surface of the through hole 113, 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 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.
[0058] 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 6 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.
[0059] In some of these implementations, such as Figure 9As 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.
[0060] 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.
[0061] The insulation cotton 15 is a heat insulation layer, which can be made of heat insulation cotton or heat insulation cotton. It 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 heat insulation chamber, which effectively prevents the heat of the heating device 11 from escaping to its outer surface, and provides heat insulation for the heating device 11 to minimize heat loss.
[0062] 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.
[0063] like Figure 5 As 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.
[0064] The electrothermal conversion direct heating device 1 of this application embodiment includes a heating element 11, a neck part 12, and a positioning seat 13. The heating element 11 is formed by in-mold injection molding of the electrothermal conversion element 111 and the injection molded part 112. The formed through hole 113 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 element 11 and the heat insulation cotton 15 form an air insulation chamber, which has less heat loss than indirect heating, resulting in a faster heating rate of the tobacco shreds and higher heating efficiency. The heating effect can be achieved without excessively high temperatures, avoiding the surface of the tobacco product 2 from burning while the internal temperature of the tobacco shreds is not yet at the smoking temperature; 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, making the resistance to smoking the tobacco product 2 low, and the other end of the tobacco product 2 located at the opening 121 serves as a mouthpiece that will not burn the mouth, and the tobacco product 2 is fixed by the neck piece 12, so that the tobacco product 2 will not be pulled out of the through hole 113 when the user smokes the mouthpiece.
[0065] The electrothermal conversion direct heating device 1 of this application, through experiments, has been found to have the following properties:
[0066] 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.
[0067] 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, modifications can be made to these features and embodiments to adapt to specific situations and materials without departing from the spirit and scope of this application. Therefore, this application is not subject to...
[0068] The specific embodiments disclosed herein are limited, and all embodiments falling within the scope of the claims of this application are protected by this application.
Claims
1. An electrothermal conversion direct heating device for tobacco products, the electrothermal conversion direct heating device being configured to heat the tobacco products to generate aerosol, characterized in that, The electrothermal conversion direct heating device includes: An integrally molded heating device includes an electrothermal conversion element and an injection molded part, which are combined by in-mold injection molding. The injection molded part is formed and fixes the electrothermal conversion element during the in-mold injection molding process. The inner surface of the injection molded part and the inner surface of the electrothermal conversion element are on the same curved surface, and a through hole is formed for accommodating the tobacco product. Both ends of the electrothermal conversion element are exposed on the outer surface of the injection molded part for connecting external conductive pins. The heating device has one or more hollow cavities for forming an air insulation chamber. The electrothermal conversion element includes a spiral coil, the inner surface of which 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 injection molding, the spiral coil is fixed after in-mold injection molding, a distance is maintained between two adjacent spiral coils, and the outer surface of the spiral coil is exposed in the hollow cavity formed by the injection molded part; the spiral coil is circular or raceway-shaped, so that the through hole is cylindrical or raceway-shaped. The neck component is a hollow structure, with one end of the neck component connected to one end of the injection molded part, and the other end of the neck component having 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 tobacco product. One end of the tobacco product is inserted through the opening of the neck piece, passes through the through hole into the positioning seat, and abuts against the step to form a ventilation chamber; the other end of the tobacco product extends out from the opening as a mouthpiece, the tobacco product is secured by the neck piece, and is directly heated by the electrothermal conversion element. The inner surface of the through hole and the outer surface of the tobacco product have at least two grooves. The opening of the neck piece, the grooves and the ventilation chamber form an air circulation channel. The internal shape of the opening of the neck piece matches the shape of the through hole, and the opening has at least two protrusions facing the center of the opening. The tobacco product can be deformed by the protrusions and form the groove when passing through the through hole.
2. The electrothermal conversion direct heating device according to claim 1, characterized in that, Both ends of the heating device are equipped with heat insulation rings. The heat insulation rings are integrated with one end of the neck piece and one end of the positioning seat opening structure to form a receiving cavity for placing tobacco products. 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, When the through hole is shaped like a racetrack cylindrical hole, the length of the line connecting the two bends of the racetrack cylindrical hole is greater than or equal to the cross-sectional diameter of the tobacco product, and the length of the line connecting the two straight sections of the racetrack cylindrical hole is less than or equal to the cross-sectional diameter of the tobacco product.
4. The electrothermal conversion direct heating device according to claim 1, characterized in that, The electrothermal 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.
5. The electrothermal conversion direct heating device according to claim 4, characterized in that, Several hollow cavities are evenly distributed around the circumference of the injection molded part, and the thermal insulation cotton wraps the outer surface of the injection molded part. The hollow cavities and the thermal insulation cotton form an air insulation chamber.