A bare cartridge suitable for electromagnetic heating

Abstract

This invention relates to a bare tobacco cartridge suitable for electromagnetic heating. The bare tobacco cartridge is formed by extrusion molding of a porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles. The metal composite magnetic conductor particles are uniformly distributed in the bare tobacco cartridge. The metal composite magnetic conductor particles are used to generate alternating eddy currents inside the metal composite magnetic conductor particles in an alternating magnetic field because the surface of the metal composite magnetic conductor particles cuts the alternating magnetic field lines of the alternating magnetic field. The eddy currents generate heat in the metal composite magnetic conductor particles, thereby causing the bare tobacco cartridge to release smoke. The alternating magnetic field is provided by an electromagnetic induction coil surrounding the outside of the bare tobacco cartridge. The metal composite magnetic conductor particles are formed by sintering a mixture of manganese zinc ferrite doped with cerium trioxide, ytterbium trioxide, and vanadium pentoxide and molybdenum disilicide powder doped with aluminum.

Description

Technical Field

[0001] This invention relates to the field of electronic cigarette technology, and more specifically to a bare cigarette cartridge suitable for electromagnetic heating. Background Technology

[0002] Currently, the global e-cigarette market is growing rapidly. According to reports, the global e-cigarette market grew by approximately 34.2% in 2021, with global retail sales reaching US$15.688 billion, and it continues to grow, indicating a vast market potential.

[0003] Compared to traditional cigarettes, e-cigarettes do not involve combustion. Instead, they heat the e-liquid or herbal particles in the cartridge at a relatively low temperature (generally below 500°C) to atomize or produce an aerosol. Because there is no combustion, the content of harmful substances such as carbon monoxide and tar is reduced, significantly minimizing the harm of secondhand smoke. Furthermore, since the e-liquid or herbal particles in the cartridge are pre-treated, many harmful substances have been removed, resulting in a substantial reduction in harmful substances. The smoke produced does not contain toxic substances such as tar, carbon monoxide, or nitrite, and it also does not produce secondhand smoke, which has a significant impact on those around the user.

[0004] In existing technologies, electronic cigarettes typically use heating wires to heat the atomizer. However, heating wires have low heating efficiency, high heat loss, poor heating effect, short lifespan, and poor heating uniformity. While some existing electronic cigarettes use electromagnetic heating, these still suffer from problems such as high coercivity and magnetic loss, and low magnetic permeability.

[0005] In addition, the e-cigarette cartridges used in existing technologies are usually simply replacements of tobacco from traditional cigarettes. The manufacturing process requires the installation of external filters, baffles, and wrapping paper. This traditional cartridge manufacturing process is complex, uses a lot of materials, and is not environmentally friendly.

[0006] Furthermore, existing heating control methods in e-cigarettes are not sufficiently efficient, either consistently using the same power or employing PID control. Consistently using the same power results in a preheating time of approximately 20 to 40 seconds to reach the target preheating temperature of the e-liquid cartridge. Moreover, as the e-liquid is consumed, continuing to use the same power negatively impacts the user experience. PID control, on the other hand, requires a temperature detection device, leading to complex equipment, complex control circuitry, and high manufacturing costs. Developing a heating control method compatible with novel electromagnetically heated e-liquid cartridges is a pressing technical problem that needs to be solved in this field. Summary of the Invention

[0007] The present invention aims to provide a novel bare e-cigarette cartridge suitable for electromagnetic heating, in order to solve the problems of complex processing, excessive material usage, environmental unfriendliness, low heating efficiency, high coercivity and magnetic loss, and unreasonable heating control methods in the existing e-cigarette cartridges.

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a novel bare tobacco cartridge suitable for electromagnetic heating. The bare tobacco cartridge is formed by extrusion molding of a porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles. The metal composite magnetic conductor particles are uniformly distributed throughout the bare tobacco cartridge. These particles generate alternating eddy currents within the metal composite magnetic conductor particles in an alternating magnetic field because their surfaces cut the alternating magnetic lines of force. These eddy currents generate heat in the metal composite magnetic conductor particles, causing the bare tobacco cartridge to release smoke. The alternating magnetic field is provided by an electromagnetic induction coil surrounding the outside of the bare tobacco cartridge. The metal composite magnetic conductor particles are formed by sintering a mixture of manganese-zinc ferrite doped with cerium trioxide, ytterbium trioxide, and vanadium pentoxide with molybdenum disilicide powder doped with aluminum.

[0009] Preferably, the electromagnetic induction coil is electrically connected to a control circuit board; the control circuit board is used to control the electromagnetic induction coil to generate an alternating magnetic field according to a predetermined heating power formula.

[0010] Preferably, the mass percentages of the porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles are as follows: porous carrier material 10-30%, mixed powder 20-50%, tobacco extract mixture 25-40%, particle aggregation inhibitor 5-8%, binder 15-30%, and metal composite magnetic conductor particles 5-25%.

[0011] Preferably, the average particle size of the metal composite magnetic conductor particles is between 30 micrometers and 65 micrometers.

[0012] More preferably, the manganese-zinc ferrite is prepared by using ferric oxide, manganese dioxide, and zinc oxide in a molar ratio of 52.5:32:12.5 as the main raw material. The main raw materials are mixed evenly and then placed in a ball mill for a single ball milling process. The mass ratio of balls, material, and water during the first ball milling is 5:1:1.5. The ball milling process lasts for 2 hours at a speed of 300 r / min, with alternating forward and reverse rotation every 0.5 hours. After grinding, the ball-milled slurry is sent to a vacuum drying oven for heating and drying. After heating and drying, the resulting powder is sent to a pre-firing furnace for pre-firing at 950℃ for 3 hours. After pre-firing, the powder is cooled with the furnace. Then, 0.06%-0.08% cerium trioxide, 0.06%-0.07% ytterbium trioxide, and 0.07%-0.09% vanadium pentoxide are added to the cooled powder, along with other components according to their mass percentages. Molybdenum disilicide powder doped with aluminum at a ratio of 0.2%-0.6% was mixed and then fed into a ball mill for secondary ball milling. This process refined the powder into a pre-calcined material, exposing unreacted raw materials so that they could react completely during sintering. The mass ratio of balls, material, and water during the secondary ball milling was 5:1:1.5, and the milling lasted for 3 hours. The powder was then dried in a vacuum drying oven. A 15% PVA solution was added to the dried powder as a binder, with a powder-to-PVA solution mass ratio of 12:1. The dried powder and PVA solution were mixed evenly and then spray-granulated. The resulting particles were sieved, and particles with an average particle size between 30 and 65 micrometers were selected. These particles were then fed into a vacuum tube furnace and sintered at 1460°C for 4.5 hours with a nitrogen-oxygen mixture at a partial pressure of 6% oxygen. After the sintering period, nitrogen was introduced into the vacuum tube furnace to cool the particles to room temperature, thus obtaining the metal composite magnetic conductor particles.

[0013] Preferably, the matrix of the aluminum-doped molybdenum disilicide powder is Mo(Si). 0.7 Al 0.3 )2.

[0014] More preferably, the outer peripheral wall of the bare e-cigarette cartridge suitable for electromagnetic heating is further inlaid with external metal composite magnetic conductor particles, which are spirally inlaid around the outer peripheral wall of the bare e-cigarette cartridge; the spiral shape specifically refers to a shape in which the pitch gradually decreases along the axial direction of the bare e-cigarette cartridge from the top to the bottom.

[0015] Preferably, the predetermined heating power formula is as follows:

[0016]

[0017] Wherein, P is the predetermined heating power output by the electromagnetic induction coil;

[0018] P max The maximum heating power that the electromagnetic induction coil can output;

[0019] t is the time elapsed from the start of the timer when the electromagnetically heated bare smoke cartridge is activated, in seconds;

[0020] When the heating power calculated according to the predetermined heating power formula is greater than the maximum heating power that the electromagnetic induction coil can output, the electromagnetic induction coil generates an alternating magnetic field with the maximum heating power it can output.

[0021] More preferably, the control circuit board also has a built-in circuit protection device, which is used to detect the time for the electromagnetic induction coil to generate an alternating magnetic field at its maximum output heating power. When the time for the electromagnetic induction coil to generate an alternating magnetic field at its maximum output heating power is longer than a predetermined time, the circuit protection device cuts off the power supply to the electromagnetic induction coil and stops heating.

[0022] More preferably, the predetermined time is 4 to 6 seconds; the first time is 5 to 7 seconds.

[0023] Beneficial effects

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] The bare tobacco cartridge suitable for electromagnetic heating described in this invention, used in conjunction with a matching electromagnetic induction coil and a suitable heating control method, achieves high heating efficiency, low heat loss, and excellent heating effect. The heating control method is reasonable, eliminating the need for preheating time and quickly reaching the target preheating temperature of the tobacco cartridge. Furthermore, the heating power is dynamically adjusted as the tobacco is consumed, improving the user experience. The absence of a temperature detection device simplifies the equipment structure and reduces manufacturing costs.

[0026] The bare cigarette cartridge of this invention is formed by extrusion molding of a porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles. The metal composite magnetic conductor particles are uniformly distributed throughout the bare cigarette cartridge. These metal composite magnetic conductor particles are formed by sintering a mixture of manganese-zinc ferrite doped with cerium trioxide (Ce₂O₃), ytterbium trioxide (Yb₂O₃), and vanadium pentoxide (V₂O₅) with aluminum-doped molybdenum disilicide powder. Compared with manganese-zinc ferrite samples without cerium trioxide (Ce₂O₃), ytterbium trioxide (Yb₂O₃), vanadium pentoxide (V₂O₅), and aluminum-doped molybdenum disilicide powder, the grain size uniformity is improved by 35.7%, the average magnetic loss is reduced by 18.6%, the average amplitude permeability is increased by 20.6%, and the coercivity is reduced by 8.52% (at 100 kHz) and 7.83% (at 20 kHz).

[0027] In addition, the present invention also embeds external metal composite magnetic conductor particles on the outer peripheral wall of the bare e-cigarette cartridge. The external metal composite magnetic conductor particles are embedded in the outer peripheral wall of the bare e-cigarette cartridge in a spiral shape. The spiral shape adopts a form in which the pitch gradually decreases along the axial direction of the bare e-cigarette cartridge from the top to the bottom, which further improves the user's smoking experience. Attached Figure Description

[0028] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the specific embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0029] Figure 1 It is the fitting curve of the predetermined heating power formula. Detailed Implementation

[0030] The invention is described in more detail below to aid in understanding it.

[0031] The naked cigarette cartridge suitable for electromagnetic heating described in this invention is formed by extrusion molding of a porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles. The metal composite magnetic conductor particles are uniformly distributed in the naked cigarette cartridge. The metal composite magnetic conductor particles are used to generate alternating current eddies inside the metal composite magnetic conductor particles in an alternating magnetic field because the surface of the metal composite magnetic conductor particles cuts the alternating magnetic field lines of the alternating magnetic field. The current eddies generate heat in the metal composite magnetic conductor particles, thereby causing the naked cigarette cartridge to release smoke. The alternating magnetic field is provided by an electromagnetic induction coil surrounding the outside of the naked cigarette cartridge. The metal composite magnetic conductor particles are formed by sintering a mixture of manganese zinc ferrite doped with cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), and vanadium pentoxide (V2O5) and molybdenum disilicide powder doped with aluminum.

[0032] Preferably, the electromagnetic induction coil is electrically connected to a control circuit board; the control circuit board is used to control the electromagnetic induction coil to generate an alternating magnetic field according to a predetermined heating power formula.

[0033] Preferably, the mass percentages of the porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles are as follows: porous carrier material 10-30%, mixed powder 20-50%, tobacco extract mixture 25-40%, particle aggregation inhibitor 5-8%, binder 15-30%, and metal composite magnetic conductor particles 5-25%.

[0034] Preferably, the average particle size of the metal composite magnetic conductor particles is between 30 micrometers and 65 micrometers.

[0035] More preferably, the manganese-zinc ferrite is prepared by using ferric oxide, manganese dioxide, and zinc oxide in a molar ratio of 52.5:32:12.5 as the main raw material. The main raw materials are mixed evenly and then placed in a ball mill for a single ball milling process. The mass ratio of balls, material, and water during the first ball milling is 5:1:1.5. The ball milling process lasts for 2 hours at a speed of 300 r / min, with alternating forward and reverse rotation every 0.5 hours. After the first ball milling, the milled slurry is sent to a vacuum drying oven for heating and drying. After heating and drying, the desired product is obtained... The powder was fed into a pre-firing furnace for pre-firing at 950℃ for 3 hours. After pre-firing, the powder cooled with the furnace. (Pre-firing can increase the activity of the powder, enabling it to produce a portion of the manganese-zinc ferrite phase. The applicant's research found that the activity of the powder decreases with increasing pre-firing temperature, and the activity of the pre-firing powder has a significant impact on the microstructure of the final sintered product. Excessive activity in the powder leads to faster grain growth under the same sintering conditions, which can easily result in abnormal grains.) After cooling, 0.06%-0.08% of a certain amount of [unspecified ingredient] was added to the powder. Cerium trioxide (Ce₂O₃), 0.06%-0.07% ytterbium trioxide (Yb₂O₃), and 0.07%-0.09% vanadium pentoxide (V₂O₅), mixed with molybdenum disilicide powder doped with aluminum at a mass ratio of 0.2%-0.6%, are fed into a ball mill for secondary ball milling. This process refines the powder into a pre-calcined material, exposing unreacted raw materials for complete reaction during sintering. The mass ratio of balls, material, and water during the secondary ball milling is 5:1:1.5, and the milling time is 3 hours. The mixture is then placed in a vacuum drying oven for drying. The powder was dried; 15% PVA solution was added as a binder to the dried powder, with a powder-to-PVA solution mass ratio of 12:1. The dried powder and PVA solution were mixed evenly and then spray-granulated. The resulting particles were sieved, and particles with an average particle size between 30 and 65 micrometers were separated. The particles were then fed into a vacuum tube furnace and sintered at 1460°C for 4.5 hours with a nitrogen-oxygen mixture at 6% oxygen partial pressure. After the sintering was completed, nitrogen was introduced into the vacuum tube furnace to cool the particles to room temperature, thus obtaining the metal composite magnetic conductor particles.

[0036] Preferably, the matrix of the aluminum-doped molybdenum disilicide powder is Mo(Si). 0.7 Al 0.3 )2.

[0037] In the crystal structure of molybdenum disilicide, silicon atoms form covalent bonds, while molybdenum atoms are metallic bonds. The molybdenum-silicon atom relationship lies between covalent bonds and metallic bonds, giving molybdenum disilicide the characteristic of coexistence of metallic and covalent bonds. By doping molybdenum disilicide powder with aluminum, the fracture toughness and compressive strength of molybdenum disilicide are improved, while the microstructure and magnetic properties of the metal composite magnetic conductor particles are also improved.

[0038] The surface morphology of the metal composite magnetic conductor particles was observed by scanning electron microscopy, and elemental quantitative analysis of the micro-area on the sample surface was performed. It was found that the average grain size inside the metal composite magnetic conductor particles was between 5 and 15 micrometers. Compared with the manganese zinc ferrite samples without cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), and vanadium pentoxide (V2O5) and aluminum-doped molybdenum disilicide powder, the grain size uniformity was improved by 35.7%.

[0039] Under test conditions of room temperature, 100mT, and 100kHz, the soft magnetic AC performance of the metal composite magnetic conductor particles was tested using a soft magnetic AC measurement device. It was found that the average magnetic loss of the metal composite magnetic conductor particles was approximately 58.67, which was 18.6% lower than that of undoped cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), and vanadium pentoxide (V2O5), as well as manganese zinc ferrite samples doped with aluminum disilicide powder.

[0040] At 100 kHz, the average amplitude permeability of the metal composite magnetic conductor particles was 4256, which was 20.6% higher than that of manganese zinc ferrite samples without cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), and vanadium pentoxide (V2O5) and aluminum-doped molybdenum disilicide powder under the same conditions.

[0041] At 100 kHz, the coercivity of the metal composite magnetic conductor particles was 9.67, which was 8.52% lower than that of manganese zinc ferrite samples without cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), and vanadium pentoxide (V2O5) and aluminum-doped molybdenum disilicide powder under the same conditions.

[0042] The coercivity of the metal composite magnetic conductor particles at 20 kHz was 7.86, which was 7.83% lower than that of manganese zinc ferrite samples without cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), and vanadium pentoxide (V2O5) and aluminum-doped molybdenum disilicide powder under the same conditions.

[0043] Preferably, the outer peripheral wall of the bare e-cigarette cartridge suitable for electromagnetic heating is further inlaid with external metal composite magnetic conductor particles, which are spirally inlaid around the outer peripheral wall of the bare e-cigarette cartridge; the spiral shape specifically refers to a shape in which the pitch gradually decreases from the top to the bottom of the bare e-cigarette cartridge along the axial direction of the bare e-cigarette cartridge.

[0044] During the research on used tobacco cartridges, the applicant discovered that when a tobacco cartridge without embedded external metal composite magnetic conductor particles on its outer perimeter was cut into three parts along the axial direction, the top third of the tobacco cartridge contained almost no tobacco extract mixture or mixed powder, the middle third contained a small amount of tobacco extract mixture and mixed powder, and the bottom third contained more than 35% tobacco extract mixture and mixed powder residue. This indicates that the bottom third of the tobacco cartridge has a relatively low utilization rate, and discarding it directly would be a significant waste.

[0045] In the applicant's long-term experience in the industry, there have been no reports of research on used, unused e-cigarette cartridges; the industry standard is to discard the cartridges directly after use. Consequently, existing technologies do not address the technical issues of how to fully utilize the active ingredients in the cartridges.

[0046] To address the technical problem of fully utilizing the active ingredients in tobacco cartridges, the applicant of this application creatively proposed a technical solution of embedding external metal composite magnetic conductor particles on the outer peripheral wall of a bare tobacco cartridge. The initial solution was to completely cover the outer peripheral wall of the bare tobacco cartridge with these particles, increasing the number of particles closer to the bottom. This also effectively solved the problem of fully utilizing the active ingredients in the cartridge. An accidental discovery inspired the applicant to improve upon this method by completely covering the outer peripheral wall of the bare tobacco cartridge with external metal composite magnetic conductor particles. At the time, the machine was running low on these particles, resulting in some bare tobacco cartridges having only a partial covering. To avoid waste, the applicant compared these partially covered cartridges with those fully covered with external metal composite magnetic conductor particles and found that the difference in the utilization rate of the active ingredients was not significant.

[0047] This unexpected discovery inspired the applicant to improve the bare tobacco cartridge completely covered with external metal composite magnetic conductor particles. Several improvement schemes were proposed, such as covering only the bottom third of the outer wall of the cartridge, using a strip-like method from top to bottom to cover the external metal composite magnetic conductor particles, and using a ring-like method. Ultimately, the external metal composite magnetic conductor particles were determined to be spirally embedded around the outer wall of the cartridge. Since the bottom third of the cartridge mainly contains a large amount of tobacco extract mixture and powder residue, it was crucial to cover the bottom third of the cartridge with as many external metal composite magnetic conductor particles as possible. This allows for more thorough heating of the bottom third of the cartridge. Therefore, the pitch of the spiral gradually decreases from the top to the bottom of the cartridge along its axial direction. This approach balances saving on the amount of external metal composite magnetic conductor particles used (i.e., reducing costs) with ensuring more thorough heating of the bottom third of the cartridge.

[0048] The aforementioned external metal composite magnetic conductor particles are formed by sintering a mixture of manganese-zinc ferrite doped with cerium trioxide (Ce2O3), ytterbium trioxide (Yb2O3), samarium trioxide (Sm2O3) and vanadium pentoxide (V2O5) with aluminum-doped molybdenum disilicide powder.

[0049] The preparation method of the external metal composite magnetic conductor particles is similar to that of the metal composite magnetic conductor particles. It also involves using ferric oxide, manganese dioxide, and zinc oxide in a molar ratio of 52.5:32:12.5 as the main ingredients to proportion the manganese-zinc ferrite. The main ingredients are mixed evenly and then placed in a ball mill for a single ball milling process. The mass ratio of balls, material, and water in the first ball milling is 5:2:1.5. The first ball milling lasts for 2 hours at a speed of 350 r / min, with intervals of 0.5... The ball mill rotates alternately in both directions for hours; after one ball milling cycle, the milled slurry is sent to a vacuum drying oven for heating and drying; after heating and drying, the resulting powder is sent to a pre-firing furnace for pre-firing at a temperature of 970℃ for 3.5 hours, and then cooled with the furnace; 0.06%-0.08% cerium trioxide (Ce₂O₃), 0.06%-0.07% ytterbium trioxide (Yb₂O₃), and 0.05%-0.06% samarium trioxide (SmO₃) are added to the cooled powder by mass fraction. The mixture of Sm2O3 and 0.07%-0.09% vanadium pentoxide (V2O5), along with 0.3%-0.5% molybdenum disilicide powder doped with aluminum, is fed into a ball mill for secondary ball milling. This process refines the powder into a pre-calcined material, exposing unreacted raw materials for complete reaction during sintering. The mass ratio of balls, material, and water during the secondary ball milling is 5:1.5:1.5, and the milling lasts for 4 hours. The mixture is then dried in a vacuum drying oven. Finally, a mass fraction of [unspecified ingredient] is added to the dried powder. A 20% PVA solution was used as a binder, and the mass ratio of powder to PVA solution was 13:1. The dried powder and PVA solution were mixed evenly and then spray-granulated. The resulting particles were sieved, and particles with an average particle size between 20 and 45 micrometers were separated. The particles were then fed into a vacuum tube furnace and sintered at 1440°C for 5.5 hours with a nitrogen-oxygen mixture of 6% oxygen partial pressure. After the sintering was completed, nitrogen was introduced into the vacuum tube furnace to cool the particles to room temperature, thus obtaining the external metal composite magnetic conductor particles.

[0050] The external metal composite magnetic conductor particles exhibit superior physical properties compared to the metal composite magnetic conductor particles.

[0051] The surface morphology of the external metal composite magnetic conductor particles was observed by scanning electron microscopy, and elemental quantitative analysis of the micro-area on the sample surface was performed. It was found that the average grain size inside the external metal composite magnetic conductor particles was between 4 and 12 micrometers, and the grain size uniformity was improved by 3.9% compared with the metal composite magnetic conductor particles.

[0052] Under test conditions of room temperature, 100mT, and 100kHz, the soft magnetic AC performance of the external metal composite magnetic conductor particles was tested using a soft magnetic AC measurement device. It was found that the average magnetic loss of the external metal composite magnetic conductor particles was approximately 52.36, which was 10.76% lower than that of the metal composite magnetic conductor particles.

[0053] At 100 kHz, the average amplitude permeability of the metal composite magnetic conductor particles is 4274, which is 0.42% higher than that of the metal composite magnetic conductor particles under the same conditions.

[0054] The coercivity of the metal composite magnetic conductor particles at 100 kHz is 9.34, which is 3.41% lower than that of the metal composite magnetic conductor particles under the same conditions.

[0055] The coercivity of the metal composite magnetic conductor particles at 20 kHz is 7.47, which is 4.96% lower than that of the metal composite magnetic conductor particles under the same conditions.

[0056] Preferably, the amount of the external metal composite magnetic conductor particles accounts for 10% to 40% of the total amount of the metal composite magnetic conductor particles.

[0057] Preferably, the predetermined heating power formula is as follows:

[0058]

[0059] Wherein, P is the predetermined heating power output by the electromagnetic induction coil, in watts;

[0060] P max The maximum heating power that the electromagnetic induction coil can output is expressed in watts.

[0061] t is the time elapsed from the start of the timer when the electromagnetically heated bare smoke cartridge is activated, in seconds;

[0062] When the heating power calculated according to the predetermined heating power formula is greater than the maximum heating power that the electromagnetic induction coil can output, the electromagnetic induction coil generates an alternating magnetic field with the maximum heating power it can output.

[0063] It should be noted that in the formula for the predetermined heating power, the physical quantities (predetermined heating power P, maximum heating power P) are... maxThe unit (watts, seconds) for the start time (t) is only used to represent the magnitude of the value and does not participate in the calculations in the formula. This is because the predetermined heating power formula is a fitting formula derived through data fitting, rather than a physical or mathematical formula derived through rigorous mathematical derivation. For example, if t is 60 seconds, and the unit is changed to minutes, then t becomes 1 minute. The unit "second" is only used to represent the magnitude of the value "60" and does not participate in the calculations in the formula. If the unit "second" is not restricted to the formula, those skilled in the art may use the value "1 minute" to substitute into the formula for calculations, resulting in incorrect calculation results. The unit "watt" is the same; it does not participate in the calculations in the formula.

[0064] More preferably, the control circuit board also has a built-in circuit protection device. This circuit protection device is used to detect the time it takes for the electromagnetic induction coil to generate an alternating magnetic field at its maximum output heating power. When the time it takes for the electromagnetic induction coil to generate an alternating magnetic field at its maximum output heating power is longer than a predetermined time, the circuit protection device cuts off the power supply to the electromagnetic induction coil, stops heating, and after the first time of stop, reconnects the power supply to the electromagnetic induction coil, resets t to zero, and restarts the timing.

[0065] The predetermined heating power formula was derived through fitting a large amount of experimental data. To address the technical problem in existing technologies where consistently using the same heating power results in a preheating time of approximately 20 to 40 seconds before the target preheating temperature of the e-cigarette cartridge is reached, this application first applies the maximum heating power P within 2 seconds of the user activating the electromagnetically heated bare e-cigarette cartridge. max Heating allows the e-cigarette cartridge to reach its target preheating temperature in the shortest possible time, fundamentally solving the problem of a preheating time of about 20 to 40 seconds that affects the user experience.

[0066] The value of 2 seconds was determined by the applicant through experiments, taking into account the maximum heating power P. max By determining the target preheating temperature of the e-cigarette cartridge, the required time can be easily calculated. Two seconds is an optimal value, satisfying the need to quickly reach the target preheating temperature of the cartridge without causing excessive use of maximum heating power P for an extended period. max This affects the lifespan of the electromagnetic induction coil.

[0067] After more than 2 seconds, in order to determine the appropriate heating power, the applicant designed a series of experiments. First, the applicant wanted to avoid placing a temperature detection device in the electronic cigarette, thus ruling out the possibility of using PID control. Second, the applicant wanted to obtain a single-valued function of real-time heating power relative to heating time, which would make control simpler.

[0068] Based on the above objectives, the applicant aims to go from 0 to P. max As a sample space for heating power, a time sample space of 0 to 3 minutes (i.e., 180 seconds, the average time to smoke a cigarette is about 3 minutes) was used. The time sample space was used as the horizontal axis, and the heating power sample space was used as the vertical axis. The heating power was gradually increased in an arithmetic sequence. 200 volunteers were selected as the sample space of testers. The 200 volunteers scored the e-cigarettes made with different heating power control methods. The data with the highest score was selected as the fitting data. Based on these fitting data, the curve and the corresponding function equation were fitted, and then the final heating power formula was determined.

[0069] Assume P max The power is 36 watts, and the power increases sequentially in an arithmetic progression over 180 seconds. Specifically, at t = 1 second and 2 seconds, the heating power output by the electromagnetic induction coil is P. max That is, 36 watts; at t=3 seconds, the heating power output of the electromagnetic induction coil is 0.6 watts, at t=4 seconds, the heating power is 0.8 watts, at t=5 seconds, the heating power is 1 watt, and so on, until t=180 seconds, when the heating power is 36 watts. Two hundred volunteers rated their experience using the electronic cigarette manufactured using this control method, and the scores were recorded. Scoring was done every 5 seconds.

[0070] Change the common difference of the arithmetic sequence to 0.1 watts, 0.3 watts, 0.4 watts, ..., and re-score each time it is changed, and record the score.

[0071] Using the same tolerance as the previous experiment, the power was decreased sequentially over 180 seconds in a geometric progression. The results were scored and recorded.

[0072] Over 180 seconds, the power is increased or decreased sequentially in a geometric progression, with scores recorded. The common ratios of the geometric progression are 0.1, 0.2, 0.3, ..., 2.

[0073] Sort all scores by size, select the top-ranked data to form a score data space, and plot the corresponding time values ​​and heating power from the selected data in a Cartesian coordinate system. Then, use SCILAB software to fit and generate a score data space. Figure 1 The curve shown corresponds to the equation, which is the predetermined heating power formula.

[0074] More preferably, the predetermined time is 4 to 6 seconds, and the first time is 5 to 7 seconds.

[0075] The predetermined time of 4 to 6 seconds and the first time of 5 to 7 seconds are also the preferred results obtained from the experiment. The specific experimental process is similar to the experimental process of obtaining the fitting formula (the predetermined heating power formula). In the same way, 200 volunteers scored the different predetermined time and first time, and selected the data with the highest scores as the preferred data for the corresponding predetermined time and first time.

[0076] After deriving the fitting formula (the predetermined heating power formula), it was found that during the experiment, when the electronic cigarette was controlled using this heating power formula, the maximum heating power P was typically reached at 22 to 23 seconds. max Once the maximum heating power is reached and no further power can be increased, if the maximum heating power is maintained for a time longer than the predetermined time (4 to 6 seconds), heating will stop. After the first stop time (5 to 7 seconds), the power will be reconnected, and timer t will be reset to zero before restarting. After restarting, the heating power will still be controlled according to the predetermined heating power formula and will not affect the scoring value.

[0077] More preferably, the porous carrier material is an inorganic porous carrier material or an organic porous carrier material. The inorganic porous carrier material is at least one of molecular sieves, zeolite powder, macroporous resin, porous ceramic powder, alumina powder, coral powder, porous silica gel, oak powder, foamed nickel, foamed aluminum, porous stainless steel, porous silicon carbide, and foamed glass. The organic porous carrier material is at least one of expanded tobacco stem powder, flower stem powder, kudzu root powder, coffee powder, and peppermint leaf powder.

[0078] The mixed powder comprises tobacco leaves, tobacco stems, and aromatic plants, wherein the tobacco leaves, tobacco stems, and aromatic plants are present in the following mass percentages: tobacco leaves 15-25%, tobacco stems 20-30%, and aromatic plants 30-50%. The tobacco leaves include at least one of the following: upper tobacco leaf powder, middle tobacco leaf powder, and lower tobacco leaf powder. The aromatic plants include at least one of the following: artemisia argyi, bitter orange blossom, Panax notoginseng flower stem, tea leaves, honeysuckle, dandelion, mint leaves, lotus leaves, coconut shell, frangipani, mesona chinensis, gynostemma pentaphyllum, Clerodendrum trichotomum, maca, Antrodia camphorata, tea stems, and fruits of Solanaceae plants.

[0079] The tobacco extract mixture comprises: tobacco extract and food-grade alcohol solution, wherein the tobacco extract and food-grade alcohol solution are present in the following mass ratios: tobacco extract 20-40%, food-grade alcohol solvent 60-80%. The food-grade alcohol solvent comprises: edible ethanol, glycerol, and propylene glycol, wherein the edible ethanol, glycerol, and propylene glycol are present in the following mass ratios: edible ethanol 5-15%, glycerol 15-50%, and propylene glycol 5-50%. Preferably, the concentration of the edible ethanol is 75 wt%.

[0080] The particle aggregation inhibitors include one or a combination of glyceryl triacrylate, glyceryl trimethacrylate, and pentaerythritol tetraacrylate.

[0081] The adhesive is at least one of the following: polyvinylpyrrolidone, vinylpyrrolidone-vinyl acetate copolymer, dextrin, starch, methylcellulose, ethylcellulose, CMC, CMCNa, guar gum, xanthan gum, and HPMC.

[0082] It should be noted that the environmentally friendly heated tobacco cartridges used in this embodiment differ from those on the market that replace the tobacco in traditional cigarettes. Instead, they are naked tobacco cartridges directly pressed according to the latest cartridge formula, without external filters, baffles, or wrapping paper. This new type of naked tobacco cartridge uses less material and is more environmentally friendly.

[0083] The preferred embodiments of the present invention have been described above, but are not intended to limit the invention. Those skilled in the art can make modifications and variations to the embodiments disclosed herein without departing from the scope and spirit of the invention.

Claims

1. A bare smoke cartridge suitable for electromagnetic heating, characterized in that, The aforementioned bare cigarette cartridge suitable for electromagnetic heating is formed by extrusion molding of porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder, and metal composite magnetic conductor particles. The metal composite magnetic conductor particles are uniformly distributed in the bare cigarette cartridge. The metal composite magnetic conductor particles are used to generate alternating eddy currents inside the metal composite magnetic conductor particles in an alternating magnetic field because the surface of the metal composite magnetic conductor particles cuts the alternating magnetic field lines of the alternating magnetic field. The eddy currents generate heat in the metal composite magnetic conductor particles, thereby causing the bare cigarette cartridge to release smoke. The alternating magnetic field is provided by an electromagnetic induction coil surrounding the outside of the bare cigarette cartridge. The metal composite magnetic conductor particles are formed by sintering a mixture of manganese zinc ferrite doped with cerium trioxide, ytterbium trioxide, and vanadium pentoxide and molybdenum disilicide powder doped with aluminum. The matrix of the aluminum-doped molybdenum disilicide powder is Mo(Si). 0.7 Al 0.3 )2; The outer peripheral wall of the bare e-cigarette cartridge suitable for electromagnetic heating is also inlaid with external metal composite magnetic conductor particles. The external metal composite magnetic conductor particles are inlaid in a spiral shape around the outer peripheral wall of the bare e-cigarette cartridge. The spiral shape specifically refers to the form in which the pitch gradually decreases along the axial direction of the bare e-cigarette cartridge from the top to the bottom.

2. The bare smoke cartridge suitable for electromagnetic heating according to claim 1, characterized in that, The electromagnetic induction coil is electrically connected to the control circuit board; the control circuit board is used to control the electromagnetic induction coil to generate an alternating magnetic field according to a predetermined heating power formula.

3. The bare smoke cartridge suitable for electromagnetic heating according to claim 1, characterized in that, The mass composition ratio of the porous carrier material, mixed powder, tobacco extract mixture, particle aggregation inhibitor, binder and metal composite magnetic conductor particles is as follows: porous carrier material 10-30%, mixed powder 20-50%, tobacco extract mixture 25-40%, particle aggregation inhibitor 5-8%, binder 15-30%, and metal composite magnetic conductor particles 5-25%.

4. The bare smoke cartridge suitable for electromagnetic heating according to claim 1, characterized in that, The average particle size of the metal composite magnetic conductor particles is between 30 micrometers and 65 micrometers.

5. The bare smoke cartridge suitable for electromagnetic heating according to claim 3, characterized in that, The manganese-zinc ferrite is prepared by using ferric oxide, manganese dioxide, and zinc oxide in a molar ratio of 52.5:32:12.5 as the main raw materials. The main raw materials are mixed evenly and then subjected to a single ball milling process. The mass ratio of balls, material, and water in the single ball milling is 5:1:1.

5. The single ball milling lasts for 2 hours at a speed of 300 r / min, with alternating forward and reverse rotation every 0.5 hours. After the single ball milling, the slurry is sent to a vacuum drying oven for heating and drying. After heating and drying, the resulting powder is sent to a pre-firing furnace for pre-firing at 950℃ for 3 hours. After pre-firing, the powder is cooled with the furnace. Then, 0.06%-0.08% cerium oxide, 0.06%-0.07% ytterbium oxide, and 0.07%-0.09% vanadium pentoxide are added to the cooled powder, along with a mixture of 0. Molybdenum disilicide powder doped with aluminum (0.2%-0.6%) is mixed and then fed into a ball mill for secondary ball milling. This process refines the powder into a pre-calcined material, exposing unreacted raw materials for complete reaction during sintering. The mass ratio of balls, material, and water during the secondary ball milling is 5:1:1.5, and the milling lasts for 3 hours. The powder is then dried in a vacuum drying oven. A 15% PVA solution is added to the dried powder as a binder, with a powder-to-PVA solution mass ratio of 12:

1. The dried powder and PVA solution are mixed evenly and then spray-granulated. The resulting particles are sieved, and particles with an average particle size between 30 and 65 micrometers are selected. These particles are then fed into a vacuum tube furnace and sintered at 1460°C for 4.5 hours using a nitrogen-oxygen mixture with a 6% oxygen partial pressure. After sintering, nitrogen is introduced into the vacuum tube furnace to cool the particles to room temperature, yielding the metal composite magnetic conductor particles.

6. The bare smoke cartridge suitable for electromagnetic heating according to claim 2, characterized in that, The formula for the predetermined heating power is as follows: Wherein, P is the predetermined heating power output by the electromagnetic induction coil; P max The maximum heating power that the electromagnetic induction coil can output; t is the time elapsed from the start of the timer when the electromagnetically heated bare smoke cartridge is activated, in seconds; When the heating power calculated according to the predetermined heating power formula is greater than the maximum heating power that the electromagnetic induction coil can output, the electromagnetic induction coil generates an alternating magnetic field with the maximum heating power it can output.

7. The bare smoke cartridge suitable for electromagnetic heating according to claim 6, characterized in that, The control circuit board also has a built-in circuit protection device, which is used to detect the time for the electromagnetic induction coil to generate an alternating magnetic field at its maximum output heating power. When the time for the electromagnetic induction coil to generate an alternating magnetic field at its maximum output heating power is longer than a predetermined time, the circuit protection device cuts off the power supply to the electromagnetic induction coil and stops heating.

8. The bare smoke cartridge suitable for electromagnetic heating according to claim 7, characterized in that, The predetermined time is 4 to 6 seconds.

Images