WO2022061911A1

WO2022061911A1 - Smoke generating device for induction heating in folding air channel

Info

Publication number: WO2022061911A1
Application number: PCT/CN2020/118484
Authority: WO
Inventors: 吴俊�; 李廷华; 李寿波; 朱东来; 张霞; 巩效伟; 韩熠; 赵伟; 洪鎏; 尤俊衡; 廖晓祥
Original assignee: 云南中烟工业有限责任公司
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2022-03-31
Also published as: JP7285333B2; JP2022553472A; EP4000433B1; EP4000433A4; KR20220044159A; KR102573417B1; EP4000433A1

Abstract

A smoke generating device for induction heating in a folding air channel, belonging to the field of heating cigarette smoking sets. The smoke generating device comprises a cigarette lead-in pipe (1), an induction coil (3), a heating cup (5), a heating element (6) and a magnetic conduction sealing body (7), wherein the cigarette lead-in pipe (1) is arranged at an upper end of the smoke generating device and has a hollow pipe structure, an inner cavity is a gas mixing cavity (1D), the diameter of the gas mixing cavity (1D) is larger than that of an inner cavity of the heating cup (5), and a gap is provided between the inner wall of the cigarette lead-in pipe (1) and an upper end of the heating cup (5) and serves as an air intake channel (1A). In the smoke generating device, spatial folding for shortening a spatial axial length is carried out on an original "heating body + cigarette" structure, so as to reduce the axial length of a heating portion of a smoking set. The heating element (6) in the smoke generating device is arranged in an air channel, and the air channel is folded back and forth, such that the length of an airflow channel is increased, and the axial length of the smoke generating device is reduced.

Description

A smoking device for induction heating in a folded airway

technical field

The invention belongs to the field of novel cigarette smoking sets, in particular to a smoking device for induction heating in a folded airway.

Background technique

With the improvement of people's health awareness, heat-not-burn cigarettes are more and more favored by smokers because they are less harmful than traditional smoking cigarettes. At present, heating methods for HNB cigarettes include: contact electric heating, non-contact electric heating, charcoal heating, and the like.

Contact electric heating refers to the direct contact heating of cigarettes to obtain flue gas. It uses various forms of heating equipment such as tubes, needles or plates that are electrically heated to directly contact cigarettes or shredded tobacco, and the temperature is lower than the ignition point of the cigarettes. It directly touches and bakes cigarettes or tobacco, so that the aroma components and smoke-emitting components of tobacco are volatilized, so as to meet the smoking requirements of smokers.

The above-mentioned method for heating cigarettes or cut tobacco has the following problems:

1. The shredded tobacco that is in direct contact with the cigarette or the shredded tobacco can be fully baked, while the shredded tobacco that is slightly farther from the heating element cannot be fully baked, and the baking effect has a certain difference in the cross section of the cigarette circumference uniformity;

Second, the heating appliance itself is small in size, and its own heat capacity is not high. Smokers need to have a certain heating waiting time before smoking. Because the heating element is in direct contact with the shredded tobacco, in order to ensure the heating effect of the tobacco part far away from the heating body, the surface temperature of the heating element is usually increased by 10-20 degrees higher than the optimal heating temperature to ensure the adequacy of heating. But at the same time, the problem is: after the tobacco in contact with the heating element is heated for several times, the cured tobacco substance will stick to the heating element, which will bring peculiar smell or heating difficulty to the subsequent smoking of cigarettes. .

Existing charcoal heated cigarettes are ignited by using a charcoal rod attached to the front end of the tobacco to rapidly heat the air flowing through the charcoal rod. When the hot air continues to flow through the shredded tobacco at the end of the cigarette under the action of the negative pressure of the smoker, the shredded tobacco is roasted and heated to achieve non-combustion heating of the shredded tobacco. Therefore, this heating method can obtain tobacco aroma, and avoid harmful substances such as tar and nicotine produced in large quantities due to ignition. Although this charcoal-heated cigarette has the characteristics of lower harm than existing ordinary cigarettes, the front end of the cigarette is attached with a charcoal rod, which not only increases the difficulty of cigarette manufacturing and affects the production efficiency, but also causes consumers to ignite the charcoal rod. It takes a long time, and it is not easy to ignite. After the charcoal rod is ignited, it may have a certain odor or poor ventilation with the smoking environment, resulting in carbon monoxide and even unsafe risks. Similarly, it is difficult to control the charcoal rod after it is ignited, and there is also a roasting of the shredded tobacco when it is not smoking. Moreover, the end of the charcoal rod is also in direct contact with or relatively close to the cut tobacco. Therefore, there are the following problems: there is also a phenomenon that a small amount of residual cut tobacco is directly roasted or even marginally roasted at the end of the burning charcoal rod.

The existing non-contact electric heating method utilizes a smoking device that electrically heats the input air, and adopts a ring-shaped metal heating element, a flat-layered metal heating element, or a combined flat-layered metal heating element to be directly heated by electricity, and the convection flows over its surface. The air is heated and then introduced into the cigarettes for "baking" all-round three-dimensional heating.

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

1. Due to the energization relationship between the adjacent surfaces of the heating element, there must be enough space for mutual insulation to prevent short circuit, so there is a problem that only the air flowing through the surface layer of the heating element can be fully heated;

2. The problem of inconvenient temperature measurement and control of the heating element: because the temperature sensor cannot be directly installed on the heating element with space requirements, and the air flow path is not only inconvenient to install and lead, but also has gas during suction and no suction. The relative temperature difference between flow and static is too large and difficult to control.

Existing heated cigarettes are composed of two parts: a tobacco section and a filter rod, and most of the filter rods are composed of a support section close to the tobacco section, a cooling section in the middle and a lip end at the end that is in contact with the consumer's lips. part composition. When the heated cigarette is inserted into the existing smoking set that heats the cigarette, because the tobacco section of the cigarette is short, most of it is only 10-15mm, and it will not exceed 20mm at most. (or) The supporting section of the filter rod is inserted into the heating cavity of the smoking device together. In addition, when consumers use a general-purpose smoking set that is not produced for a certain variety (or brand) of cigarettes, it will directly cause the end of the heating element to be less than 2 mm from the support section of the cigarette filter rod, or even penetrate into the filter rod support section. phenomenon of the head. Under the above circumstances, once the cigarette is heated and drawn normally, there is a high probability that the material of the support section cannot withstand the high temperature of the heating body and thermal shrinkage or thermal collapse occurs. This not only affects the smoking of the second half of the cigarette (due to the thermal shrinkage or thermal collapse of the support section, the cigarette is deformed or softened), but also directly affects the smoking taste of the cigarette.

In order to solve the above-mentioned problems, the present invention has been proposed.

SUMMARY OF THE INVENTION

The present invention provides a smoking device for induction heating in a folded airway, the smoking device comprises: a cigarette introduction pipe 1, an induction coil 3, a heating cup 5, a heating element 6 and a magnetic conductive sealing body 7;

Wherein, the cigarette introduction pipe 1 is arranged on the upper end of the smoking device, it is a hollow pipe structure, the inner cavity is an air-mixing cavity 1D, and the center of the upper end of the cigarette introduction pipe 1 is a first introduction hole 1B. The center of the lower end is the second introduction hole 1E. The outer ring of the first introduction hole 1B is provided with several air guide grooves 1C. The diameter of the air mixing chamber 1D is larger than the diameter of the first introduction hole 1B. The second introduction hole 1E and the first introduction hole 1B have the same diameter and are coaxial, and the lower end of the cigarette introduction pipe 1 has at least one air inlet 1A.

The first introduction hole 1B and the second introduction hole 1E are coaxial with the same diameter and slightly smaller than the nominal diameter of the cigarette, so as to clamp 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 in the direction in which the cigarettes are inserted to facilitate the insertion of the cigarettes.

The second introduction hole 1E is a cigarette guide hole that assists in guiding and fixing the part of the cigarette filter.

The heating cup 5 is arranged below the cigarette introduction pipe 1, and has a hollow cup-shaped structure as a whole, with a cigarette accommodating cavity 8 inside, and at least one air intake hole 9 at the bottom of the cup;

The magnetic conductive seal 7 is surrounded by the periphery of the heating cup 5, and the whole is a hollow cup-shaped structure, and the bottom of the cup is relatively sealed (only the two wiring pins of the temperature measuring element 12 need to be from the bottom of the magnetic conductive seal 7). through), there is an air flow channel between the inner wall of the magnetic conductive seal 7 and the outer wall of the heating cup 5;

The heating element 6 is arranged in the air flow channel, and the heating element 6 is a ferromagnetic metal, which has a structure that can pass through the air;

For example, the heating element 6 is a clustered ferromagnetic metal wire, a clustered ferromagnetic metal mesh, or a ferromagnetic porous metal, and its interior and/or surface has/forms numerous dense airflow paths;

The induction coil 3 is arranged on the periphery of the magnetic conductive seal 7 and is connected to a power supply;

The air guide groove 1C, the air mixing cavity 1D, the air inlet 1A, the air flow channel, the air inlet hole 9 and the cigarette holder cavity 8 are in air communication.

The inside and/or the surface of the heating element 6 has/forms a number of dense air flow passages in air communication with the above-mentioned air flow passages.

The magnetic conductive sealing member 7 is composed of materials such as glass-ceramic or ceramics, which are permeable to magnetic fields and resistant to high temperature.

The working principle of the air mixing chamber 1D is as follows: when a cigarette to be smoked is inserted, the tobacco segment of the cigarette is inserted into the cigarette accommodating chamber 8 , and the cigarette filter rod is inserted into the cigarette introduction pipe 1 . The outside air enters the air mixing cavity 1D from the air guide groove 1C. In this cavity, the normal temperature air surrounding the cigarette filter rod will be heated by conduction and radiation. The relatively high temperature cigarette introduction pipe 1 is separated from the cigarette filter rod. open, so that the existing cigarette introduction tube 1 with a large area in contact with the cigarette filter rod becomes only in contact with the partial hole wall of the first introduction hole 1B and the short cylindrical inner hole wall of the second introduction hole 1E. The axial length of the hole wall of the two holes is short, so the contact area between the two holes and the cigarette filter rod is small.

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 portion between the hole wall of the second introduction hole 1E and the cigarette filter rod is preferably 0.3-0.8 mm, which basically presents a line contact state. In this way, even if it is affected by the heating part, the temperature of the cigarette inlet pipe 1 is very high, and it is not easy to cause heat shrinkage or peculiar smell of the material in the support section of the cigarette filter rod. At the same time, the cigarette inlet pipe 1 is mixed with air. The relative high temperature of the cooling section on the inner wall around the cavity 1D and the cigarette holder inserted in the center can properly preheat the inhaled normal temperature air, thereby achieving the purpose of reducing the power consumption of the smoking tool and improving the thermal efficiency.

The induction coil 3 applies medium and high frequency currents of relatively high power when the smoking tool is in operation, and can perform electromagnetic induction heating on the heating element 6 of the ferromagnetic material.

Preferably, the induction coil 3 is arranged on the periphery of the magnetic conductive seal 7 .

Preferably, the heating element 6 includes a ferromagnetic metal fiber tow, a ferromagnetic metal fiber composite mesh, or a ferromagnetic porous or foamed metal block.

Preferably, the smoking device further comprises: an electromagnetic isolation ring 2 , which is a hollow tubular structure and is arranged on the periphery of the induction coil 3 . The induction coil 3 has a high temperature insulating layer.

Preferably, the smoking device further comprises:

Insulation and heat insulation layer 7A, which is wrapped around the periphery of the magnetic conductive seal 7;

The 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 high temperature resistant wrapping layer 7B and the inner wall of the electromagnetic isolation ring 2 for further heat insulation.

Herein, the high temperature resistance means that the material does not undergo significant deformation at 300 degrees Celsius.

The insulating layer 7A is a high temperature resistant material, and the purpose is to protect the insulating layer on the surface of the induction coil 3 wound thereon from being ablated due to the high temperature of the magnetic conductive seal 7 . In this way, when the induction coil 3 passes a medium to high frequency current, the high-frequency changing magnetic field acting on the inside of the heating element 6 can generate many small-scale induced eddy currents inside the heating element 6 made of ferromagnetic material, which makes the heating element 6 6 Rapid heating.

The insulating and high temperature resistant wrapping layer 7B is a wrapping layer of high temperature resistant and insulating protective film added to the outer layer of the induction coil 3 to protect the induction coil 3 and to assist in fixing the induction coil 3. on the outside of the magnetically conductive sealed cavity 7 .

The electromagnetic isolation ring 2 is a metal non-ferromagnetic material such as copper or aluminum alloy, and the inner wall of the electromagnetic isolation ring 2 has a distance of 0.1-1 mm or more from the insulating and high temperature resistant wrapping layer 7B outside the induction coil 3 In this way, on the one hand, the heat transfer from the radially outward of the entire smoking device is minimized, and on the other hand, the electromagnetic signal is prevented from radiating to the radially outer part of the smoking device, so as to ensure that the surrounding of the smoking device has a relatively good external The electromagnetic environment also reduces the propagation of electromagnetic power from useless directions.

Preferably, the smoking device further includes: a first temperature measuring element 4 and a second temperature measuring element 12; wherein, the first temperature measuring element 4 is embedded in the heating element 6, and the second temperature measuring element The element 12 is disposed in the uniform heat chamber 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic conductive seal 7 , and faces the air inlet 9 .

The working process of the first temperature measuring element 4 and the second temperature measuring element 12 is as follows: in a control circuit attached to the smoking device. The temperature of the heating element 6 is measured by the first temperature measuring element 4 , and the temperature of the heating element 6 is sent to the control circuit to timely control the electrical parameters loaded into the induction coil 3 .

When the gas sucked in from the gas mixing chamber 1D passes through the pores of the heating element 6 , the heating element 6 exchanges heat with the incoming gas, and they are sucked into the soaking chamber 11 The inside of the cigarette is evenly mixed, and is inhaled into the cigarette from the center, the air inlet 9 at the bottom of the heating cup 5 with the second temperature measuring element 12, and the tobacco part of the cigarette is heated and roasted. At this time, the second temperature measuring element 12 measures the air temperature in the soaking chamber 11 again, and sends the information to the control circuit, so as to realize the feedback of the heating power, speed and other parameters of the heating element 6 control.

Preferably, the smoking device further comprises: a heat insulation pipe 10, a heat insulation base 13, and a base 14; wherein, the heat insulation pipe 10 is arranged on the periphery of the electromagnetic isolation ring 2 and clamped to the smoke The branch is introduced between the pipe 1 and the base 14;

The electromagnetic isolation ring 2 is clamped between the cigarette inlet pipe 1 and the heat insulation seat 13;

The heat insulation seat 13 is arranged below the magnetic conductive seal 7 , and the base 14 is arranged below the heat insulation seat 13 .

The thermal insulation pipe 10 is a vacuum double-layer thermal insulation pipe. The heat-insulating seat 13 is made of heat-resistant silica gel. The base 14 is made of high temperature resistant material PEEK plastic or the like.

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 .

Preferably, the smoking device is provided with an electromagnetic isolation layer, and the electromagnetic isolation layer includes: an electromagnetic isolation layer attached to the inside of the gas mixing chamber 1D, and an electromagnetic isolation layer attached to the upper or lower part of the heat insulating seat 13 . More specifically, when electromagnetic isolation needs to be sealed to the maximum extent at the axial ends of the smoking device, a layer of about 0.01 can be attached to the upper and lower inner walls of the air mixing chamber 1D on the surrounding inner walls and the upper and lower inner walls. ~0.1mm thick aluminum foil; the lower end of the cigarette inlet pipe 1 has an inner boss that protrudes radially inward (the second introduction hole 1E is formed inside the inner boss), and the lower end surface of the inner boss must be affixed with 0.01~ 0.1mm thick aluminum foil. Similarly, an aluminum washer with a thickness of 0.01-0.1 mm can also be bonded to the upper or lower part of the heat insulating seat 13 in the axial lower part of the smoking device, which can also prevent electromagnetic interference from occurring in the axial lower part. Of course, at the places where the aluminum gasket, the heat insulating base 13 and the two connecting wires 15 lead out, there should be holes of appropriate size to prevent short circuit. The surface of the aluminum gasket facing the cigarette holder cavity 8 is preferably silver-coated or polished to a high gloss, which is also conducive to the reflection of the heat radiated from the soaking cavity 11, which is beneficial to the smoke generation. Insulation inside the device.

Preferably, the air inlet holes 9 are distributed at the bottom of the heating cup 5 in an annular distribution.

Preferably, the diameters of the first introduction hole 1B and the second introduction hole 1E are slightly smaller than the nominal diameter of the cigarette to be smoked, and smaller than or equal to the diameter of the cigarette accommodating cavity 8 .

Preferably, the lower end of the cigarette introduction pipe 1 has an inner boss that protrudes radially inward, the lower end has a lower boss that protrudes axially downward, and the at least one air inlet 1A is annularly distributed on the lower boss on and through the lower boss;

The upper end of the heating cup 5 abuts against the lower surface of the inner boss and is located inside the lower boss; the upper end of the magnetically conductive sealing body 7 is located outside the lower boss.

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

The present invention has the following beneficial effects:

1. For the first time, the present invention designs a smoking device for induction heating in a folded airway. The heating principle is induction heating. The inside and/or surface of the heating body has/forms a plurality of air flow passages, which can counteract the air flowing through its surface and inside. Quickly and fully heat the cigarette, and then use the heated air to heat the cigarette, which effectively solves the previous problems of uneven heating of electric heating cigarettes, charcoal heating cigarettes that are easy to burn, difficult to control, lack of aroma components, and poor suction. Compared with the existing contact-type electric heating, non-contact-type electric heating and charcoal heating methods, the smoking device of the present invention can cure tobacco more uniformly and more fully, and there is no contact-type electric heating caused by the baked tobacco. Tobacco substance adhesion, tobacco segment retention in smoking sets, etc.

2. The previous simple series "heating body + cigarette" solution will make the axial length of the heating part of the cigarette longer, and the length of the smoking device will also be longer. In order to overcome this shortcoming and give full play to the advantages of induction heating, the present invention performs spatial folding to reduce the axial length of the space of the original "heating body + cigarette", so as to reduce the axial length of the heating part of the smoking device. The heating element 6 of the present invention is arranged in the airway, and the airway is in a folded and reciprocating form, which not only increases the length of the airflow channel, but also reduces the axial length of the smoking device.

3. The most important thing is that the design of the air mixing cavity 1D inside the cigarette introduction pipe 1 and the air guide groove 1C on it has the following functions: reducing the contact area with the cigarette filter rod to avoid cigarette filter Thermal shrinkage of the material in the support section of the rod; preheating of the intake air.

4. A uniform heat cavity 11 is formed between the bottom of the heating cup 5 and the bottom of the magnetically conductive sealing member 7 of the smoking device. The uniform heating chamber 11 has the following functions: the user's suction generates a pressure difference in the uniform heating chamber 11, and under the action of the pressure difference, multi-regional micro-flows are generated inside the uniform heating chamber 11, and the heat and pressure difference are evened out. The air inlet 9, after being subjected to the negative pressure generated by suction, sucks the relatively homogenized gas with a certain temperature drop into the cigarettes inserted in the cigarette accommodating cavity 8, and uses these homogenized high-temperature gases to treat the cigarettes. The tobacco part in the stick is roasted and heated.

5. In a preferred technical solution, the air intake holes 9 are distributed in a ring shape at the bottom of the heating cup 5, and the air in the uniform heat chamber 11 enters the cigarette holder chamber 8 with a higher degree of dispersion. The heating effect of the cigarettes is more uniform.

Description of drawings

FIG. 1 is a schematic longitudinal cross-sectional view of a smoking device for induction heating in a folded airway according to Embodiment 1. FIG.

FIG. 2 is a schematic longitudinal cross-sectional view of the smoking device according to Embodiment 1 after inserting a cigarette.

FIG. 3 is a schematic longitudinal cross-sectional view of a smoking device for induction heating in a folded airway according to Embodiment 2. FIG.

List of reference numbers:

1. Cigarette introduction pipe, 1A, air inlet, 1B, first introduction hole, 1C, air guide groove, 1D, air mixing chamber, 1E, second introduction hole, 2, isolation ring, 3, induction coil, 4 , The first temperature measuring element, 5, Heating cup, 6, Heating element, 7, Magnetically conductive sealing cavity, 7A, Insulation and heat insulation layer, 7B, Insulation and high temperature resistant wrapping layer, 8, Cigarette holding cavity, 9, Air guide hole , 10, heat insulation cavity, 11, soaking cavity, 12, second temperature measuring element, 13, heat insulation seat, 14, base, 15, connecting wire.

detailed description

The content of the present invention is further described below through specific embodiments.

Example 1

As shown in Figure 1, an induction device in a folded airway includes: a cigarette inlet pipe 1, an electromagnetic isolation ring 2, an induction coil 3, a first temperature measuring element 4, a heating cup 5, a heating element 6, a magnetically conductive sealing body 7, Insulation and heat insulation layer 7A, insulation and high temperature resistant wrapping layer 7B, cigarette holder cavity 8, air inlet 9, insulation cavity 10, soaking cavity 11, second temperature measuring element 12, insulation seat 13, base 14, connection Wire 15.

Wherein, the cigarette introduction pipe 1 is arranged on the upper end of the smoking device, it is a hollow pipe structure, the inner cavity is an air-mixing cavity 1D, and the center of the upper end of the cigarette introduction pipe 1 is a first introduction hole 1B. The center of the lower end is the second introduction hole 1E. The outer ring of the first introduction hole 1B is provided with several air guide grooves 1C. The diameter of the air mixing chamber 1D is larger than the diameter of the first introduction hole 1B. The second introduction hole 1E and the first introduction hole 1B have the same diameter and are coaxial, and the lower end of the cigarette introduction pipe 1 has at least one air inlet 1A;

The diameter of the first introduction hole 1B is equal to the diameter of the second introduction hole 1E, and they are both slightly smaller than the diameter of the cigarette holder 8, and also slightly smaller than or equal to the outer diameter of the inserted cigarette;

Wherein, the outside of the cigarette introduction pipe 1 is designed as a plurality of stepped structures to fix the electromagnetic isolation ring 2 , the heating cup 5 , the magnetic conductive sealing body 7 , and the heat insulation cavity 10 below by clamping. The specific design is as follows:

The lower part of the first guide hole 1B of the cigarette introduction pipe 1 has a three-stage stepped circular cone extending downward along the axis of the first guide hole 1B and shrinking radially. Cavity 1D, the outside is connected with the heat insulation cavity 10; the second-stage circular truncated inwards can be externally connected to the electromagnetic isolation ring 2, and ensure that there is a space greater than or equal to 0.3mm with the inner wall of the heat insulation cavity 10, and the lower end face is on the induction coil 3. The edges are abutted or flush; the diameter of the third-stage circular truncated cone is further shrunk, its outer circle is directly connected to the inner wall of the magnetically conductive sealing cavity 7, and a plurality of air inlet 1A orifices that communicate with the air-mixing cavity 1D are distributed on the lower end surface. And it abuts against the upper edge of the heating element 5 , and its inner circle is inwardly connected with the outer wall of the heating cup 5 .

The heating cup 5 is arranged below the cigarette introduction pipe 1, and has a hollow cup-shaped structure as a whole, with a cigarette accommodating cavity 8 inside, and the diameter of the cigarette accommodating cavity 8 is slightly larger than or equal to the first introduction. The diameter of the hole 1B is slightly larger than or equal to the outer diameter of the inserted cigarette, and the center of the bottom of the cup has one or more air intake holes 9;

The magnetic conductive seal 7 surrounds the periphery of the heating cup 5 , and has a hollow cup-shaped structure as a whole. The bottom of the cup is sealed. There is an air flow channel between the inner wall of the magnetic conductive seal 7 and the outer wall of the heating cup 5 .

The heating element 6 is arranged in the airflow channel between the magnetic conductive seal 7 and the heating cup 5 . The heating element 6 is a circularly arranged ferromagnetic metal fiber tow radially distributed along the center line, and a plurality of air flow passages are formed inside.

The induction coil 3 is arranged on the periphery of the magnetic conductive seal 7 and is connected to a power source, and the induction coil 3 can inductively heat the heating element 6 of the ferromagnetic material.

In the order of inflow, the inhaled airflow passes through: the air guide groove 1C, the air mixing chamber 1D, the air inlet 1A, the air flow channel, the air inlet hole 9, and the cigarette accommodating chamber. 8.

The material of the cigarette introduction pipe 1 is selected from a high-temperature-resistant PEEK synthetic material with relatively poor thermal conductivity. The material of the heating cup 5 is selected from: glass-ceramic or ceramics. The magnetic conductive sealing member 7 is made of glass-ceramic.

The electromagnetic isolation ring 2 is a hollow tubular structure and is arranged on the periphery of the induction coil 3 . The electromagnetic isolation ring 2 is a metal non-ferromagnetic material such as copper or aluminum alloy.

The insulating and high temperature resistant wrapping layer 7B is a wrapping layer of high temperature resistant and insulating protective film added to the outer layer of the induction coil 3 and used to protect the induction coil 3 and fix it in the place. the outside of the heating cup 5. There is a distance of 0.1-1mm or more between the inner wall of the electromagnetic isolation ring 2 and the insulating and high temperature resistant wrapping layer 7B outside the induction coil 3, so as to minimize the heat transfer from the radial outward of the entire smoking device as much as possible, and on the other hand On the one hand, electromagnetic transmission is prevented radially outward of the smoking device, so as to ensure a relatively good external electromagnetic environment around the smoking device, and also reduce the propagation of electromagnetic power from useless directions.

The insulating and heat insulating layer 7A is wrapped around the periphery of the magnetic conductive seal 7 and is a high temperature resistant material, the purpose of which is to protect the surface insulating layer of the induction coil 3 wound on it from being ablated due to the high temperature of the magnetic conductive seal 7. . In this way, when the induction coil 3 passes a medium to high frequency current, the high-frequency changing magnetic field acting on the inside of the heating element 6 can generate many small-scale induced eddy currents inside the heating element 6 made of ferromagnetic material, which makes the heating element 6 6 Rapid heating.

The first temperature measuring element 4 is arranged inside the heating element 6 , and the second temperature measuring element 12 is arranged in the uniform heat cavity formed between the bottom of the heating cup 5 and the bottom of the magnetic conductive seal 7 . 11, and facing the center of the air intake hole 9. The smoking device is associated with a control circuit (not shown in the drawings of the present invention).

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 the temperature of the heating element 6 is sent to the control circuit to timely control the electrical parameters loaded into the induction coil 3 . When the gas sucked in from the gas mixing chamber 1D passes through the pores of the heating element 6 , the heating element 6 exchanges heat with the incoming gas, and the gas is sucked to the bottom of the heating cup 5 It is evenly mixed with the heat soaking cavity 11 formed below the bottom of the magnetic conductive seal 7, and the temperature is more consistent, and the smoke is inhaled from the center and the air inlet 9 at the bottom of the heating cup 5 with the second temperature measuring element 12. Inside the cigarette, the tobacco part of the cigarette is heated and roasted. At this time, the second temperature measuring element 12 measures the air temperature in the soaking chamber 11 again, and sends the information to the control circuit, so as to realize the feedback control of the heating power and rate parameters of the heating element 6 .

The heat insulation pipe 10 is arranged on the periphery of the electromagnetic isolation ring 2 and is clamped between the cigarette introduction pipe 1 and the base 14; the electromagnetic isolation ring 2 is clamped between the cigarette introduction pipe 1 and the base 14. Between the heat insulating bases 13; the heat insulating base 13 made of heat-resistant silica gel is arranged below the magnetic conductive seal 7, and the base 14 made of high temperature resistant material PEEK plastic is arranged on the Below the heat insulation seat 13 .

The insulation pipe 10 is a vacuum double-layer insulation pipe. The heat insulating seat 13 and the base 14 cooperate with the above components to complete the axial positioning of the entire smoking device. The connecting wires 15 of the induction coil 3 also pass through the heat insulating seat 13 and the base 14 .

When electromagnetic isolation needs to be sealed to the maximum extent at the axial ends of the smoking device, a layer of aluminum foil with a thickness of about 0.01 to 0.1 mm can be attached to the surrounding inner wall and the upper and lower inner walls of the air mixing chamber 1D in the upper part of the axial direction (Fig. 1 not shown). Similarly, an aluminum washer (not shown in FIG. 1 ) with a thickness of about 0.01-0.1 mm can also be bonded to the upper or lower part of the heat insulating seat 13 in the axial lower part of the smoking device, which can also prevent the axial lower part. Electromagnetic interference is generated. Of course, there should be enough holes in the places where the aluminum washer, the heat insulation seat 13 and the two connecting wires 15 lead out to prevent short circuits.

The schematic diagram of the smoking device according to Embodiment 1 after inserting the cigarette is FIG. 2 . Figure 2 shows the position of the various parts of the cigarette, the inhalation air flow, and the flow direction of the air flow.

Wherein, I is the tobacco segment part of the cigarette, and its length is greater than the height at which the heating cup 5 can be inserted. II is the filter rod part of the cigarette, which consists of the filter rod support section III inserted into the air mixing chamber 1D, the flue gas cooling section IV exposed in the air, and the lip filter section V.

The air entering from the outside enters the air mixing cavity 1D from the air guide groove 1C. In this cavity, the normal temperature air surrounding the cigarette filter rod separates the high temperature cigarette rod introduction pipe 1, and the cigarette filter rod II only contacts the To the partial hole wall of the first introduction hole 1B and the partial hole wall of the second introduction hole 1E. In this way, the hole wall of the indirectly heated second introduction hole 1E is only in line contact with the tobacco section of the cigarette, which can effectively prevent the thermal shrinkage and deformation of the cigarette filter because there is no direct contact with the cigarette filter. Even if it is affected by the heating part, the temperature of the cigarette inlet pipe 1 after suction is relatively high, and it is not easy to cause thermal shrinkage of the material in the support section III on the cigarette filter rod. At the same time, the high temperature of the inner wall of the air mixing chamber 1D of the cigarette introduction pipe 1 can also appropriately increase the temperature of the inhaled air, so as to achieve the purpose of improving the thermal efficiency.

The flow path of the air in the smoking device is as follows: the outside air enters the air mixing chamber 1D from the first introduction hole 1B and the air guiding groove 1C for mixing, and the inner wall of the air mixing chamber 1D is inside it. The air is preheated, and then enters the airflow channel through the air inlet 1A, where it is heated by the heating element 6, and then enters the uniform heat chamber 11. The air hole 9 enters the cigarette in the cigarette accommodating cavity 8, and the tobacco segment of the cigarette is heated to generate an aerosol, which is mixed with the aerosol to form smoke, which is sucked out of the cigarette by the user.

Example 2

The difference between this embodiment and Embodiment 1 is that the bottom of the heating cup 5 has a plurality of air inlet holes 9 distributed in an annular shape, and the longitudinal cross-sectional schematic diagram of the smoking device is shown in FIG. 3 . The second temperature measuring element 12 is arranged in the uniform heat cavity 11 formed between the bottom of the heating cup 5 and the bottom of the magnetic conductive seal 7, and is facing or biased towards any air inlet 9 (used in the figure). The rightmost one of the air intake holes 9 represents). At this time, in the air passage, the heated air enters the cigarette holder chamber 8 from the uniform heat chamber 11 through a plurality of annularly distributed air inlet holes 9, and the air has a higher degree of dispersion. The heating effect is more uniform.

The above are only specific embodiments of the present invention, but the protection scope of the present invention 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 invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

A smoking device for induction heating in a folded airway, characterized in that the smoking device comprises: a cigarette introduction pipe (1), an induction coil (3), a heating cup (5), a heating element (6) and Magnetic conductive sealing body (7);

Wherein, the cigarette introduction pipe (1) is arranged at the upper end of the smoking device, it is a hollow pipe structure, the inner cavity is an air mixing cavity (1D), and the upper end of the cigarette introduction pipe (1) The center is a first introduction hole (1B), and the center of the lower end is a second introduction hole (1E). The outer ring of the first introduction hole (1B) is provided with several air guide grooves (1C). The diameter of (1D) is larger than the diameter of the first introduction hole (1B), the second introduction hole (1E) and the first introduction hole (1B) have the same diameter and are coaxial, and the cigarette introduction pipe (1) The lower end has at least one air inlet (1A);

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

The magnetic conductive seal (7) is surrounded by the periphery of the heating cup (5), and has a hollow cup-shaped structure as a whole, and the bottom of the cup is relatively sealed. The inner wall of the magnetic conductive seal (7) and the heating cup (5) ) There is an air flow channel between the outer walls;

The heating element (6) is arranged in the air flow channel, and the heating element (6) is a ferromagnetic metal, which has a structure that can pass through the air;

The induction coil (3) is arranged on the periphery of the magnetic conductive seal (7) and is connected to a power source;

The air guide groove (1C), the air mixing chamber (1D), the air inlet channel (1A), the air flow channel, the air inlet hole (9), and the cigarette accommodating chamber (8) air flow between.
The smoking device according to claim 1, wherein the heating element (6) comprises a ferromagnetic metal fiber tow, a ferromagnetic metal fiber composite mesh, or a ferromagnetic porous, foamed metal block.
The smoking device according to claim 1, characterized in that, the smoking device further comprises: an electromagnetic isolation ring (2), which is a hollow tubular structure and is arranged on the periphery of the induction coil (3).
The smoking device according to claim 3, characterized in that, the smoking device further comprises: an insulating and heat-insulating layer (7A), which is wrapped around the periphery of the magnetic conductive seal (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 high temperature resistant wrapping layer (7B) and the inner wall of the electromagnetic isolation ring (2).
The smoking device according to claim 1, characterized in that, the smoking device further comprises: a first temperature measuring element (4) and a second temperature measuring element (12); wherein, the first temperature measuring element (4) Buried inside the heating element (6), the second temperature measuring element (12) is arranged in the uniform formed between the bottom of the heating cup (5) and the bottom of the magnetic conductive seal (7). Inside the thermal cavity (11), and facing the air inlet hole (9).
The smoking device according to claim 3, characterized in that, the smoking device further comprises: a heat insulation pipe (10), a heat insulation base (13), and a base (14); wherein, the heat insulation pipe (10) arranged on the periphery of the electromagnetic isolation ring (2) and clamped between the cigarette inlet pipe (1) and the base (14);

The electromagnetic isolation ring (2) is clamped between the cigarette inlet pipe (1) and the heat insulation seat (13);

The heat insulating seat (13) is arranged below the magnetic conductive seal (7), and the base (14) is arranged below the heat insulating seat (13).
The smoking device according to claim 1, characterized in that, the air inlet holes (9) are annularly distributed at the bottom of the heating cup (5).
The smoking device according to claim 1, characterized in that the diameters of the first introduction hole (1B) and the second introduction hole (1E) are slightly smaller than the nominal diameter of the cigarette, and smaller than or equal to the cigarette accommodating diameter The diameter of the cavity (8).
The smoking device according to claim 1, characterized in that, the lower end of the cigarette introduction pipe (1) has an inner boss that protrudes radially inward, and the lower end has a lower boss that protrudes axially downward, The at least one air inlet (1A) is annularly distributed on the lower boss and penetrates the lower boss;

The upper end of the heating cup (5) abuts against the lower surface of the inner boss and is located on the inner side of the lower boss; the upper end of the magnetically conductive sealing body (7) is located on the outer side of the lower boss .
The smoking device according to claim 6, characterized in that, an electromagnetic isolation layer is provided therein, and the electromagnetic isolation layer comprises: an electromagnetic isolation layer attached to the inside of the air mixing chamber (1D), and attached to the heat insulation layer. The electromagnetic isolation layer on the upper or lower part of the seat (13).