SMOKE GENERATING DEVICE FOR INDUCTION HEATING IN FOLDING AIR CHANNEL

Abstract

 The present disclosure relates to the field of novel cigarette smoking utensil, and in particular, to a smoke generating device with induction heating in a folded airway. The smoke generating device includes: a cigarette introduction pipe (1), an induction coil (3), a heating cup (5), a heating element (6) and a magnetic sealing element (7); wherein the cigarette introduction pipe (1) is disposed at the upper end of the smoke generating device with a hollow tubular structure, and its internal cavity is an air-mixing cavity (1D), the diameter of the air-mixing cavity (1D) is greater than that of the inner cavity of the heating cup (5), a gap is provided between the inner wall of the cigarette introduction pipe (1) and the upper end of the heating cup (5) as an air inlet channel (1A). The present disclosure folds the original "heating body + cigarettes" with a reduced space axial length, so as to reduce the axial length of the heating part of the smoke generating device. The heating element (6) of the present disclosure is disposed in the airway in a folded reciprocating form, which not only increases the length of the airflow channel, but also reduces the axial length of the smoke generating device.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of novel cigarette smoking utensil, and in particular, to a smoke generating device with induction heating in a folded airway.

BACKGROUND

[0002] With the improvement of health awareness of the public, heat-not-burn cigarettes are gaining increasing popularity among smokers since they are less harmful than traditional burning cigarettes. At present, heating methods of heat-not-burn cigarettes include: contact electric heating, non-contact electric heating, charcoal heating, etc.

[0003] Contact electric heating refers to obtaining flue gas through direct contact heating of cigarettes, which uses electric heating pipes, needles or plates and other forms of heating devices to directly contact the cigarettes or tobacco shreds, with direct contact and baking of cigarettes or tobacco at a temperature lower than the ignition point of the cigarette, so that the aroma and smoking components of the tobacco are volatilized, to meet smokers' requirements.

[0004] The problems with the above-mentioned methods of heating cigarettes or tobacco shreds are as follows:

1. The tobacco shreds in direct contact with the cigarette or tobacco can be fully baked, while those at a distance from the heating element cannot be fully baked, thereby the baking effect has a certain degree of unevenness on the cross section of the circumference of the cigarette;

2. As the heating device itself has a small volume and its heat capacity is not high, smokers need to wait for a certain amount of heating time before smoking. As the heating element is in direct contact with tobacco shreds, in order to ensure the heating effect of the tobacco shreds away from the heating element, the surface of the heating element is usually increased by 10-20 degrees than the optimal heating temperature to ensure heating adequacy. Meanwhile, the problem is that after the tobacco shreds in contact with the heating element are heated for several times, the baked tobacco substances may stick to the heating element, bringing peculiar smell or heating difficulties to the subsequent cigarette smoking.

[0005] Existing charcoal-heated cigarettes are ignited by a carbon rod attached to the front end of the tobacco, and the air flowing through the carbon rod is rapidly heated. When the hot air continues to flow through tobacco shreds at the end of the cigarette under negative pressure during the smoker's suction, tobacco shreds are baked and heated to achieve non-combustion heating of tobacco shreds. Thus, such heating method can obtain tobacco aroma and avoid harmful substances such as tar and nicotine produced in large quantities due to ignition. However, although such charcoal-heated cigarette has the characteristics of less harm than the existing ordinary cigarettes, as the front end of the cigarette is attached with a carbon rod, which increases the difficulty of cigarette manufacturing, thereby affecting production efficiency; there are also weaknesses such as it takes a long time for consumers to ignite the carbon rod, the carbon rod may have a certain peculiar smell in case of burning, or that carbon monoxide and other unsafe factors exist due to poor ventilation of the smoking environment. Besides, the carbon rod is difficult to control after igniting, tobacco shreds are still burning when not smoking, and the end of the carbon rod is in direct contact with or relatively close to the tobacco; thus, the following problem exists: at the end of the burning carbon rod, there may be direct baking or critical baking of a small amount of residual tobacco shreds.

[0006] The existing non-contact electric heating method uses a smoking utensil that electrically heats the input air, a ring-shaped metal heater, a flat-layer metal heater, or a combined flat-layer metal heater is directly energized and heated, so that the air flowing through the surface is heated, which is introduced into the cigarette for omnidirectional heating.

[0007] However, non-contact electric heating method mentioned above has the following problems:

1. Due to energization of adjacent surfaces of the heating element, sufficient space is required for mutual insulation to prevent short circuits; thus, there is a problem that only the air flowing through the surface layer of the heating element can be sufficiently heated;

2. The problem of inconvenience in temperature measurement and control of the heating element: as the temperature sensor cannot be directly installed on the heating element that requires intervals; besides, inconvenience of installation and wiring on the airflow channel exists, there are large temperature differences in the flowing and static status of the airflow when sucking or not, and that the airflow is not easy to control.

[0008] Existing heating cigarettes consist of two parts: a tobacco section and a filter rod. Most of filter rods are composed of a supporting section close to the tobacco section, a cooling section in the middle, and the end in contact with the consumer's lips. When the heating cigarette is inserted into the existing smoke generating device to heat the cigarette, as the tobacco section of the cigarette is relatively short, most of which is only 10~15mm, with the maximum of 20mm. Most cigarettes need to be inserted into the heating cavity of the smoke generating device together with the tobacco section and/or the supporting section of the filter rod. Besides, in case consumers use general-purpose smoking utensils that are not produced for a certain variety (or brand) of cigarettes, the end of the heating element may be less than 2mm away from the supporting section of the cigarette filter rod, even penetrating into the head of the supporting section of the filter rod. Under the above circumstances, once the cigarette is normally heated and sucked, there is a high probability that the supporting-section material cannot withstand the high temperature of the heating body with the occurrence of heat shrinkage or collapse. This not only affects smoking of the second half of the cigarette (the cigarette deforms or softens due to heat shrinkage or collapse of the supporting section), but also directly affects the smoking taste of the cigarette.

[0009] In order to solve the above-mentioned problems, the present disclosure is proposed.

Summary

[0010] The present disclosure provides a smoke generating device with induction heating in a folded airway. The smoke generating device includes: a cigarette introduction pipe 1, an induction coil 3, a heating cup 5, a heating element 6 and a magnetic sealing element 7;

[0011] Wherein, the cigarette introduction pipe 1 is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixing cavity 1D, the center of the upper end of the cigarette introduction pipe 1 is the first introduction hole 1B, and the center of the lower end is the second introduction hole IE, the outer ring of the first introduction hole 1B is provided with a plurality of air-guiding grooves 1C, and the diameter of the air-mixing cavity 1D is larger than that of the first introduction hole 1B, the second introduction hole 1E and the first introduction hole 1B have the same diameter and are co-axial, the lower end of the cigarette introduction pipe 1 has at least one air inlet channel 1A;

[0012] The first introduction hole 1B and the second introduction hole 1E are co-axial with the same diameter, which are slightly smaller than the nominal diameter of the cigarette, so as to snap-fit the inserted cigarette and prevent the cigarette from being accidentally taken out by the lips during smoking. The first introduction hole 1B and the second introduction hole 1E are preferably provided with chamfers to facilitate insertion of the cigarette in the direction in which the cigarette is inserted.

[0013] The second introduction hole 1E is a cigarette guiding hole that assists in guiding and fixing the cigarette filter.

[0014] The heating cup 5 is disposed below the cigarette introduction pipe 1, with a hollow cup-shaped structure as a whole, it has a cigarette accommodating cavity 8 inside, with at least one air inlet hole 9 at the bottom of the cup;

[0015] The magnetic sealing element 7 surrounds the periphery of the heating cup 5, with a hollow cup-shaped structure as a whole, the bottom of the cup is relatively sealed (only two wiring pins of the temperature measuring element 12 need to pass under the magnetic sealing element 7), and there is an airflow channel between the inner wall of the magnetic sealing element 7 and the outer wall of the heating cup 5;

[0016] The heating element 6 is disposed in the airflow channel, and the heating element 6 is made of a ferromagnetic metal with a structure that the air can pass through;

[0017] For example, the heating element 6 is clustered ferromagnetic metal wires, a clustered ferromagnetic metal mesh, or a ferromagnetic porous metal, and its interior and/or surface has/forms numerous dense airflow passages;

[0018] The induction coil 3 is disposed on the periphery of the magnetic sealing element 7 and is connected to a power source;

[0019] Airflow is in communication between the air-guiding groove 1C, the air-mixing cavity 1D, the air inlet channel 1A, the airflow channel, the air inlet hole 9 and the cigarette accommodating cavity 8.

[0020] Airflow is in communication between numerous dense airflow passages that are on/ formed inside and/or on the surface of the heating element and the aforementioned airflow channels.

[0021] The magnetic sealing element 7 is composed of high-temperature resistant materials such as glass-ceramics or ceramics that the magnetic field can penetrate through.

[0022] The working principle of the air-mixing cavity 1D is that, when the cigarette to be smoked is inserted, the tobacco section of the cigarette is inserted into the cigarette accommodating cavity 8, and the cigarette filter rod is inserted into the cigarette introduction pipe 1. Outside air enters the air-mixing cavity 1D from the air-guiding groove 1C. In this cavity, the air at room temperature surrounding the cigarette filter rod heated through conduction and radiation separate the relatively high-temperature cigarette introduction pipe 1 from the cigarette filter rod, so that the existing cigarette introduction pipe 1 with a large area in contact with the cigarette filter rod becomes only in contact with the partial bore wall of the first introduction hole 1B and the short cylindrical inner bole wall of the second introduction hole 1E. As the axial lengths of the wall of the two holes are relatively short, the contact area between the two holes and the cigarette filter rod is small.

[0023] Preferably, the upper end of the second introduction hole 1E also has an orifice chamfer, which not only facilitates the introduction of cigarettes, but also further reduces the contact area with the cigarette filter rod. The axial length of the contact part of the second introduction hole 1E bore wall and the cigarette filter rod is preferably 0.3-0.8mm, basically in a linear contact. In this case, even if affected by the heating part, the temperature of the cigarette introduction pipe 1 is high, it is not easy to cause heat shrinkage of the material in the supporting section of the cigarette filter rod or generating peculiar smell; meanwhile, the relatively high temperature of the cooling section on the inner wall of the air-mixing cavity 1D of the cigarette introduction pipe 1 and the cigarette nozzle inserted into the center can properly pre-heat the inhaled air at room temperature, so as to achieve the purpose of reducing power consumption of the smoking utensil and improving heating efficiency.

[0024] The induction coil 3 applies high-power, medium- and high-frequency currents when the smoking utensil is working, which can perform electromagnetic induction heating on the heating element 6 made of a ferromagnetic material.

[0025] Preferably, the induction coil 3 is disposed on the periphery of the magnetic sealing element 7.

[0026] Preferably, the heating element 6 includes a ferromagnetic metal fiber tow, a ferromagnetic metal fiber composite mesh, or ferromagnetic porous and foamed metal blocks.

[0027] Preferably, the smoke generating device further includes: an electromagnetic isolation ring 2 with a hollow tubular structure, which is disposed on the periphery of the induction coil 3. The induction coil 3 has a high-temperature insulation layer.

[0028] Preferably, the smoke generating device further includes:

An insulation and heat isolation layer 7A is wrapped around the periphery of the magnetic sealing element 7;

An insulating and high-temperature resistant wrapping layer 7B is wrapped around the periphery of the induction coil 3, and there is a gap between the insulating and high-temperature resistant wrapping layer 7B and the inner wall of the electromagnetic isolation ring 2 to further insulate heat.

[0029] In the present disclosure, the high-temperature resistance means that the material does not significantly deform at 300 degrees Celsius.

[0030] The insulation and heat isolation layer 7A is a made of a high-temperature resistant material, so as to protect the insulation layer on the surface of the induction coil 3 wound on it from ablation due to the high temperature of the magnetic sealing element 7. In this way, when the induction coil 3 passes medium- to high-frequency current, the high-frequency varying magnetic field acting on the heating element 6 can generate numerous small-range induced eddy currents in the heating element 6 made of a ferromagnetic material, which makes the heating element 6 quickly heat up.

[0031] The insulating and high-temperature resistant wrapping layer 7B is a high-temperature resistant, insulating protective-film wrapping layer that is added to the outer layer of the induction coil 3 to protect against high temperature and assist in fixing the induction coil 3, it is used to protect the induction coil 3 and fix it on the outside of the magnetic sealing element 7.

[0032] The electromagnetic isolation ring 2 is made of a non-ferromagnetic material including copper or aluminum alloy, the inner wall of the electromagnetic isolation ring 2 is 0.1-1mm or more from the insulating and high-temperature resistant wrapping layer 7B wrapped outside the induction coil 3; in this case, it minimizes the radially outward heat transfer of the entire smoke generating device on one hand, on the other hand, it prevents electromagnetic signals from radiating to the radially external radiation of the smoke generating device, thereby ensuring that there is a relatively good external electromagnetic environment around the smoke generating device, while reducing the transmission of electromagnetic power from useless directions.

[0033] Preferably, the smoke generating device further includes: a first temperature measuring element 4 and a second temperature measuring element 12; wherein, the first temperature measuring element 4 is implanted in the heating element 6, and the second temperature measuring element 12 is disposed in the heat-equalizing cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 inside and facing the air inlet hole 9.

[0034] The working processes of the first temperature measuring element 4 and the second temperature measuring element 12 are as follows: in the control circuit attached to the smoke generating device, the temperature of the heating element 6 is measured by the first temperature measuring element 4 and sent to the control circuit to control the electrical parameters loaded on the induction coil 3 in a timely manner.

[0035] When the gas sucked in from the air-mixing cavity 1D passes through the gap of the heating element 6, the heating element 6 exchanges the heat thereon with the inlet gas, they are sucked into the heat-equalizing cavity 11 and mixed evenly, and sucked into the cigarette from the air inlet hole 9 at the bottom of the heating cup 5 of the second temperature measuring element 12 in the center to heat the tobacco shreds of the cigarette. At this time, the second temperature measuring element 12 measures the air temperature in the heat-equalizing cavity 11 again and sends the information to the control circuit to get feedback and control of the heating power, rate and other parameters of the heating element 6.

[0036] Preferably, the smoke generating device further includes: a heat-insulating pipe 10, a heat-insulating seat 13, and a base 14; wherein, the heat-insulating pipe 10 is disposed on the periphery of the electromagnetic isolation ring 2 and is snap-fitted between the cigarette introduction pipe 1 and the base 14;

[0037] The electromagnetic isolation ring 2 is snap-fitted between the cigarette introduction pipe 1 and the heat-insulating seat 13;

[0038] The heat-insulating seat 13 is disposed under the magnetic sealing element 7, the base 14 is disposed under the heat-insulating seat 13.

[0039] The heat-insulating pipe 10 is a vacuum double-layer insulating pipe. The heat-insulating seat 13 is made of heat-resistant silica gel. The base 14 is made of high-temperature resistant PEEK plastic, etc.

[0040] The induction coil 3 is connected to a power source through a connecting wire 15, and the connecting wire 15 passes through the heat-insulating seat 13 and the base 14.

[0041] Preferably, an electromagnetic isolation layer is disposed in the smoke generating device, and the electromagnetic isolation layer includes: an electromagnetic isolation layer affixed to the inside of the air-mixing cavity 1D, and an electromagnetic isolation layer affixed to the upper or lower part of the heat-insulating seat 13.

[0042] More specifically, when electromagnetic isolation requires maximum sealing at both axial ends of the smoke generating device, the upper part of the axial direction can be pasted with an aluminum foil layer of 0.01~0.1mm on the surrounding inner walls and upper and lower inner walls of the air-mixing cavity 1D; the lower end of the cigarette introduction pipe 1 has an inner boss protruding radially inward (the inner boss is formed inside the second introduction hole IE), and the lower end surface of the inner boss must be pasted with 0.01-0.1mm aluminum foil. Similarly, at the axial lower part of the smoke generating device, an aluminum washer of 0.01-0.1mm can also be attached to the upper or lower part of the heat-insulating seat 13, which can also prevent electromagnetic interference from being generated in the axial lower part. Certainly, there should be holes of appropriate size where the aluminum washer, the heat-insulating seat 13 and the place where the two connecting wires 15 lead out to prevent short circuits. The surface of this layer of aluminum washer facing the direction of the cigarette accommodating cavity 8 is preferably silver-plated or polished to be high-gloss, so as to reflect back the heat radiated from the heat-equalizing cavity 11 for heat preservation inside the smoke generating device.

[0043] Preferably, the air inlet holes 9 are distributed annularly at the bottom of the heating cup 5.

[0044] Preferably, the diameter of the first introduction hole 1B and the second introduction hole 1E is slightly smaller than the nominal diameter of the cigarette to be smoked, which is equal to or smaller than the diameter of the cigarette accommodating cavity 8.

[0045] Preferably, the lower end of the cigarette introduction pipe 1 has an inner boss extending radially inward and has a lower boss extending axially downward, at least one air inlet channel 1A is annularly distributed on and penetrates the lower boss

[0046] The upper end of the heating cup 5 abuts against the lower surface of the inner boss and is disposed inside the lower boss; the upper end of the magnetic sealing element 7 is disposed outside the lower boss.

[0047] The above technical solutions can be freely combined under the premise of no contradiction.

[0048] The present disclosure has the following beneficial effects:

1. The present disclosure designs for the first time an electric heating smoke generating device with induction heating in a folded airway, the heating principle is induction heating, a plurality of airflow channels that are on/formed inside/on the surface of the heating element can quickly and fully heat the air flowing through the surface and inside of the heating element, with the use of the heated air to heat the cigarettes, the problems of uneven heating of electric-heated cigarettes, flammable, uncontrollable charcoal-heated cigarettes with insufficient aroma components and poor smoking sensation can be effectively solved. Compared with the existing contact electric heating, non-contact electric heating, and charcoal heating methods, the smoke generating device of the present disclosure can bake the tobacco more evenly and fully, while avoiding problems such as adhesion of tobacco substances after baking and retention of tobacco section in the smoking utensil of contact electric heating.

2. The simple tandem "heating body + cigarettes" in the existing solutions may lengthen the axial length of the cigarette heating part, as well as that of the smoking device. To overcome such shortcomings and take advantage of induction heating, the present disclosure folds the original "heating body + cigarettes" with a reduced space axial length, so as to reduce the axial length of the heating part of the smoke generating device. The heating element 6 of the present disclosure is disposed in the airway in a folded reciprocating form, which not only increases the length of the airflow channel, but also reduces the axial length of the smoke generating device.

3. What's the most important is that the design of the air-mixing cavity 1D inside the cigarette introduction pipe 1 and the air-guiding groove 1C above it has the following effects: to reduce the contact area with the cigarette filter rod, so as to avoid heat shrinkage of the material in the supporting section of the cigarette filter rod; to pre-heat the inhaled air.

4. A heat-equalizing cavity 11 is formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 of the smoke generating device. The heat-equalizing cavity 11 has the following functions: pressure differences generate in the heat-equalizing cavity 11 during users' sucking, under the action of pressure difference, the heat-equalizing cavity 11 inside produces multi-regional, micro-flow and homogenized heat and pressure difference to the air inlet hole 9, after receiving the negative pressure generated by suction, the relatively homogenized gas with a certain temperature drop is sucked into the cigarette inserted in the cigarette accommodating cavity 8, the homogenized high-temperature gas is used to bake and heat tobacco shreds in the cigarette.

5. In the preferred technical solutions, the air inlet holes 9 are distributed annularly at the bottom of the heating cup 5. When the air in the heat-equalizing cavity 11 enters the cigarette accommodating cavity 8, its degree of dispersion is higher, thus the heating effect of the cigarette is even.

BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 

FIG.1 is a schematic longitudinal cross-sectional view of a smoke generating device with induction heating in a folded airway of Embodiment 1.

FIG.2 is a schematic longitudinal cross-sectional view of the smoke generating device after inserting into a cigarette of Embodiment 1.

FIG.3 is a schematic longitudinal cross-sectional view of a smoke generating device with induction heating in a folded airway of Embodiment 2.

[0050] List of signs in the drawings:
1. Cigarette introduction pipe, 1A. Air inlet channel, 1B. First introduction hole, 1C. Air-guiding groove, 1D. Air-mixing cavity, 1E. Second introduction hole, 2. Electromagnetic isolation ring, 3. Induction coil, 4. First temperature measuring element, 5. Heating cup, 6. Heating element, 7. Magnetic sealing element, 7A. Insulation and heat-solation layer, 7B. Insulating and high-temperature resistant wrapping layer, 8. Cigarette accommodating cavity, 9. Air inlet hole, 10. Heat-insulating cavity, 11. Heat-equalizing cavity, 12. Second temperature measuring element, 13. Heat-insulating seat, 14. Base, 15. Connecting wire.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The present disclosure will be further explained below through specific embodiments.

Embodiment 1

[0052] As shown in FIG. 1, a smoke generating device with induction heating in a folded airway includes: a cigarette introduction pipe 1, an isolation ring 2, an induction coil 3, a first temperature measuring element 4, a heating cup 5, a heating element 6, a magnetic sealing element 7, an insulation and heat isolation layer 7A, an insulating and high-temperature resistant wrapping layer 7B, a cigarette accommodating cavity 8, an air inlet hole 9, a heat-insulating cavity 10, a heat-equalizing cavity 11, a second temperature measuring element 12, a heat-insulating seat 13, a base 14, and connecting wire 15.

[0053] Wherein, the cigarette introduction pipe 1 is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixing cavity 1D, the center of the upper end of the cigarette introduction pipe 1 is the first introduction hole 1B, and the center of the lower end is the second introduction hole IE, the outer ring of the first introduction hole 1B is provided with a plurality of air-guiding grooves 1C, and the diameter of the air-mixing cavity 1D is larger than that of the first introduction hole 1B, the second introduction hole 1E and the first introduction hole 1B have the same diameter and are co-axial, the lower end of the cigarette introduction pipe 1 has at least one air inlet channel 1A;

[0054] The diameter of the first introduction hole 1B is equal to that of the second introduction hole IE, which is slightly smaller than that of the cigarette accommodating cavity 8, and also equal to or slightly smaller than the outer diameter of the inserted cigarette;

[0055] Wherein, the outside of the cigarette introduction pipe 1 is designed with a plurality of stepped structures to fix the electromagnetic isolation ring 2, the heating cup 5, the magnetic sealing element 7, and the heat-insulating cavity 10 below through snap-fitting. The specific design is as follows:

The lower part of the first introduction hole 1B of the cigarette introduction pipe 1 has a three-stage stepped truncated cone that extends downward along the axial direction of the first introduction hole 1B and contracts in the radial direction; the first-stage cone has the largest outer diameter, containing the air-mixing cavity 1D inside, its outside is connected to the heat-insulating cavity 10; the second-stage cone shrinks inward, which may be connected to the electromagnetic isolation ring 2, while ensuring that there is at least a space of 0.3mm with the inner wall of the heat-insulating cavity 10, its lower end face abuts against or parallels with the upper edge of the induction coil 3; the diameter of the third-stage cone is further reduced, its outer circle is directly inscribed with the inner wall of the magnetic sealed cavity 7, its lower end surface is distributed with a plurality of inlets 1A orifices connected with the air-mixing cavity1D, and it abuts against the upper edge of the heating element 6, its inner circle is inscribed with the outer wall of the heating cup 5.

The heating cup 5 is disposed below the cigarette introduction pipe 1, with a hollow cup-shaped structure as a whole, it has a cigarette accommodating cavity 8 inside, the diameter of the cigarette accommodating cavity 8 is equal to or slightly greater than that of the first introduction hole 1B, both are equal to or slightly greater than the outer diameter of the cigarette inserted into it, and the center of the cup bottom has one or a plurality of air inlet hole(s) 9;

The magnetic sealing element 7 surrounds the periphery of the heating cup 5, with a hollow cup-shaped structure as a whole, the bottom of the cup is sealed, and there is an airflow channel between the inner wall of the magnetic sealing element 7 and the outer wall of the heating cup 5;

The heating element 6 is disposed in the airflow channel between the magnetic sealing element 7 and the heating cup 5. The heating element 6 is a ferromagnetic metal fiber bundle disposed in a ring shape radially distributed along the center line, and a plurality of airflow passages are formed inside.

[0056] The induction coil 3 is disposed on the periphery of the magnetic sealing element 7 and is connected to a power source, the induction coil 3 can inductively heat the heating element 6 made of a ferromagnetic material.

[0057] In the order of sequence, the inhaled airflow passes through: the air-guiding groove 1C, the air-mixing cavity 1D, the air inlet channel 1A, the airflow channel, the air inlet hole 9, and the cigarette accommodating cavity 8.

[0058] The material of the cigarette introduction pipe 1 is made of a high-temperature resistant PEEK synthetic material with relatively poor heat conductivity. The heating cup 5 is made of glass-ceramics or ceramics. The magnetic sealing element 7 is made of glass-ceramic.

[0059] The electromagnetic isolation ring 2 has a hollow tubular structure and is disposed on the periphery of the induction coil 3. The electromagnetic isolation ring 2 is made of a non-ferromagnetic material including copper or aluminum alloy.

[0060] The insulating and high-temperature resistant wrapping layer 7B is a high-temperature resistant, insulating protective film coating layer that is added to the outer layer of the induction coil 3 to protect and assist in fixing the induction coil 3, which is used to protect the induction coil 3 and fix it on the outer side of the heating cup 5. There is at least a gap of 0.1-1mm between the inner wall of the electromagnetic isolation ring 2 and the insulating and high-temperature resistant wrapping layer 7B wrapped outside the induction coil 3; in this case, it minimizes radially outward heat transfer of the entire smoke generating device on one hand, on the other hand, it prevents electromagnetic signals from radiating to the radially external radiation of the smoke generating device, thereby ensuring that there is a relatively good external electromagnetic environment around the smoke utensil, while reducing the transmission of electromagnetic power from useless directions.

[0061] The insulation and heat isolation layer 7A is a made of a high-temperature resistant material that is wrapped on the periphery of the magnetic sealing element 7, so as to protect the insulation layer on the surface of the induction coil 3 wound on it from ablation due to the high temperature of the magnetic sealing element 7. In this way, when the induction coil 3 passes medium- to high-frequency current, the high-frequency varying magnetic field acting on the heating element 6 can generate numerous small-range induced eddy currents in the heating element 6 made of a ferromagnetic material, which makes the heating element 6 quickly heat up.

[0062] The first temperature measuring element 4 is disposed inside the heating element 6, and the second temperature measuring element 12 is disposed in the heat-equalizing cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 and is opposite to the air inlet hole 9 in the center. The smoke generating device is attached with a control circuit (not shown in the figures of the present disclosure).

[0063] The working process of the control circuit is as follows:
The temperature of the heating element 6 is measured by the first temperature measuring element 4 and sent to the control circuit to control the electrical parameters loaded on the induction coil 3 in a timely manner. When the gas sucked in from the air-mixing cavity 1D passes through the pores of the heating element 6, the heating element 6 exchanges the heat thereon with the inlet gas, the gas is sucked into the heat-equalizing cavity 11 formed below the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 to be uniformly mixed, the temperature becomes consistent, and the gas is inhaled from the center, with the heating cup 5 of the second temperature measuring element 12 at the bottom of the air inlet hole 9, into the cigarette, to heat and bake the tobacco shreds of the cigarette. At this time, the second temperature measuring element 12 measures the air temperature in the heat-equalizing cavity 11 again, and sends the information to the control circuit to get feedback and control of the heating power, rate and other parameters of the heating element 6.

[0064] The heat-insulating pipe 10 is disposed on the periphery of the electromagnetic isolation ring 2 and is snap-fitted between the cigarette introduction pipe 1 and the base 14; the electromagnetic isolation ring 2 is snap-fitted between the cigarette introduction pipe 1 and the heat-insulating seat 13; the heat-insulating seat 13 made of heat-resistant silica gel is disposed below the magnetic sealing element 7, and the base 14 made of a high-temperature resistant material PEEK plastic is disposed under the heat-insulating seat 13.

[0065] The heat-insulating pipe 10 is a vacuum double-layered and heat-insulation pipe. The heat-insulating seat 13 and the base 14 cooperate with the above-mentioned components to complete the axial positioning of the entire smoke generating device. The connecting wire 15 of the induction coil 3 also passes through the heat-insulating seat 13 and the base 14.

[0066] When electromagnetic isolation requires maximum sealing at both axial ends of the smoke generating device, the upper part of the axial direction can be pasted with an aluminum foil layer of 0.01~0.1mm on the surrounding inner walls and upper and lower inner walls of the air-mixing cavity 1D (not shown in FIG.1); similarly, at the axial lower part of the smoke generating device, an aluminum washer of 0.01-0.1mm can also be attached to the upper or lower part of the heat-insulating seat 13 (not shown in FIG.1), which can also prevent electromagnetic interference from being generated in the axial lower part. Certainly, there should be holes of appropriate size where the aluminum washer, the heat-insulating seat 13 and the place where the two connecting wires 15 lead out to prevent short circuits.

[0067] The schematic view after the cigarette is inserted into the smoke generating device of Embodiment 1 is shown in FIG. 2. FIG.2 shows the positions of each part of the cigarette, sucking of airflow, and the direction of the airflow.

[0068] Wherein, I is the tobacco section of the cigarette, the length of which is greater than the height at which the heating cup 5 can be inserted. II is the filter rod of the cigarette, which is composed of the filter rod supporting section III inserted into the air-mixing cavity 1D, the flue gas cooling section IV exposed in the air, and the lip-end filter section V.

[0069] The air entering from the outside enters the air-mixing cavity 1D from the air-guiding groove 1C. In this cavity, the air at room temperature surrounding the cigarette filter rod separates the high-temperature cigarette introduction pipe 1, the cigarette filter rod II only touches the partial wall of the first introduction hole 1B and that of the second introduction hole 1E. In this way, the bore wall of the second introduction hole 1E that is indirectly heated is only in line contact with the tobacco section of the cigarette, which can effectively prevent heat shrinkage and deformation of the cigarette filter rod as it does not directly contact the cigarette filter rod. Even if affected by the heating part, the temperature of the cigarette introduction pipe 1 is relatively high after being sucked, thus it is not easy to cause heat shrinkage of the material in the supporting section III on the cigarette filter rod. Meanwhile, the high temperature of the inner wall of the air-mixing cavity 1D of the cigarette introduction pipe 1 can also appropriately increase the temperature of the inhaled air, so as to improve heat efficiency.

[0070] The airflow path in the smoke generating device is as follows: outside air enters the air-mixing cavity 1D from the first introduction hole 1B and the air-guiding groove 1C for mixing, the inner wall of the air-mixing cavity 1D pre-heats the air inside, the air enters the airflow channel through the air inlet channel 1A, and is heated by the heating element 6 inside, it enters the heat-equalizing cavity 11 after the heat and pressure are homogenized, then enters the cigarette in the cigarette accommodating cavity 8 through the air inlet hole 9 to heat the tobacco section of the cigarette to generate aerosol, and it is mixed with the aerosol to form smoke and sucked out of the cigarette by users.

Embodiment 2

[0071] The difference between the two embodiments is that the bottom of the heating cup 5 has a plurality of air inlet holes 9 distributed annularly, and the schematic longitudinal sectional view of the smoke generating device is shown in FIG.3. The second temperature measuring element 12 is disposed in the heat-equalizing cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic sealing element 7 and is opposite to or biases toward any air inlet hole 9 (demonstrated by the air inlet hole 9 on the far right in the figures). At this time, in the airway, the heated air enters the cigarette accommodating cavity 8 from the heat-equalizing cavity 11 through a plurality of annularly distributed air inlet holes 9, the degree of dispersion of the air is higher, and the heating effect of the cigarette is even.

[0072] The above are only specific embodiments of the present disclosure, the protection scope of the present disclosure is not limited thereto, any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present disclosure, and they shall be covered by the protection scope of the present disclosure. Thus, the protection scope of the present disclosure shall be subject to the protection scope of the claims.

Claims

1. A smoke generating device with induction heating in a folded airway, wherein the smoke generating device comprises: a cigarette introduction pipe (1), an induction coil (3), a heating cup (5), a heating element (6) and a magnetic sealing element (7);

Wherein, the cigarette introduction pipe (1) is disposed at the upper end of the smoke generating device, with a hollow tubular structure, its internal cavity is an air-mixing cavity (1D), the center of the upper end of the cigarette introduction pipe (1) is the first introduction hole (1B), and the center of the lower end is the second introduction hole (1E), the outer ring of the first introduction hole (1B) is provided with a plurality of air-guiding grooves (1C), and the diameter of the air-mixing cavity (1D) is larger than that of the first introduction hole (1B), the second introduction hole (IE) and the first introduction hole (1B) have the same diameter and are co-axial, the lower end of the cigarette introduction pipe (1) has at least one air inlet channel (1A);

The heating cup (5) is disposed under the cigarette introduction pipe (1), it has a hollow cup-shaped structure as a whole, with a cigarette accommodating cavity (8) inside, with at least one air inlet hole (9) at the bottom of the cup;

The magnetic sealing element (7) surrounds the periphery of the heating cup (5), it has a hollow cup-shaped structure as a whole, the bottom of the cup is relatively sealed, there are airflow channels on the inner walls of the magnetic sealing element (7) and the outer walls of the heating cup (5);

The heating element (6) is disposed in the airflow channel, and the heating element (6) is made of a ferromagnetic metal with a structure that the air can pass through;

The induction coil (3) is disposed on the periphery of the magnetic sealing element (7) and is connected to a power source;

Airflow is in communication between the air-guiding groove (1C), the air-mixing cavity (1D), the air inlet channel (1A), the airflow channel, the air inlet hole (9), and the cigarette accommodating cavity (8).

2. The smoke generating device of claim 1, wherein the heating element (6) comprises ferromagnetic metal fibers, a ferromagnetic metal fiber composite mesh, or ferromagnetic porous and foamed metal blocks.

3. The smoke generating device of claim 1, wherein the smoke generating device further comprises: an electromagnetic isolation ring (2) with a hollow tubular structure, which is disposed on the periphery of the induction coil (3).

4. The smoke generating device of claim 3, wherein the smoke generating device further comprises: an insulation and heat isolation layer (7A) wrapped around the periphery of the magnetic sealing element (7);
An insulating and high-temperature resistant wrapping layer (7B) is wrapped around the periphery of the induction coil (3), and there is a gap between the insulating and high-temperature resistant wrapping layer (7B) and the inner wall of the electromagnetic isolation ring (2).

5. The smoke generating device of claim 1, wherein the smoke generating device further comprises: a first temperature measuring element (4) and a second temperature measuring element (12); wherein the first temperature measuring element (4) is implanted inside the heating element (6), the second temperature measuring element (12) is disposed in a heat-equalizing cavity (11) formed between the bottom of the heating cup (5) and the bottom of the magnetic sealing element (7), and is facing the air inlet hole (9).

6. The smoke generating device of claim 3, wherein the smoke generating device further comprises: a heat-insulating pipe (10), a heat-insulating seat (13), and a base (14); wherein the heat-insulating pipe (10) is disposed on the periphery of the electromagnetic isolation ring (2) and is snap-fitted between the cigarette introduction pipe (1) and the base (14);

The electromagnetic isolation ring (2) is snap-fitted between the cigarette introduction pipe (1) and the heat-insulating seat (13);

The heat-insulating seat (13) is disposed below the magnetic sealing element (7), the base (14) is disposed below the heat-insulating seat (13).

7. The smoke generating device of claim 1, wherein the air inlet holes (9) are distributed annularly at the bottom of the heating cup (5).

8. The smoke generating device of claim 1, wherein the diameter of the first introduction hole (1B) and the second introduction hole (1E) is slightly smaller than the nominal diameter of the cigarette, which is equal to or smaller than the diameter of the cigarette accommodating cavity (8).

9. The smoke generating device of claim 1, wherein the lower end of the cigarette introduction pipe (1) has an inner boss extending radially inward and has a lower boss extending axially downward, at least one air inlet channel (1A) is annularly distributed on and penetrates the lower boss;
The upper end of the heating cup (5) abuts against the lower surface of the inner boss and is disposed inside the lower boss; the upper end of the magnetic sealing element (7) is disposed outside the lower boss.

10. The smoke generating device of claim 6, wherein an electromagnetic isolation layer is disposed inside, and the electromagnetic isolation layer comprises: an electromagnetic isolation layer attached to the inside of the air-mixing cavity (1D), and an electromagnetic isolation layer attached to the upper or lower part of the heat-insulating seat (13).

Drawing