Induction heating aerosol-generating device and system therefor

Abstract

An induction heated aerosol-generating device is capable of heating an aerosol-generating article by induction heating to generate an aerosol for a user to smoke; the induction heated aerosol-generating device comprises a housing defining a heating chamber for receiving at least a portion of the aerosol-generating article; an inductor comprising an induction coil; a power supply connected to the induction coil and configured to provide a high-frequency current to the induction coil, the induction coil generating, in use, an oscillating electromagnetic field to heat an induction heat generator in thermal contact with the aerosol-generating article and in turn heat an aerosol-generating substrate of the aerosol-generating article; characterised in that a side of the induction coil is provided with at least one coil-free window in the range of the effective magnetic field.

Description

Technical Field

[0001] This patent relates to the field of novel tobacco technology, and in particular to an induction heating aerosol generating device. Background Technology

[0002] In recent years, with people paying increasing attention to health, people have realized that traditional cigarettes have certain health hazards, and the impact of traditional cigarettes on health and the environment has gradually received attention from countries around the world.

[0003] Currently, most heated cigarette devices on the market utilize the principle of resistance heating, with heating methods mainly including inner core heating, outer perimeter heating, and a combination of inner and outer heating. In devices with inner core heating, a needle-type heating element is typically used to facilitate the insertion of the aerosol generator. This requires a small cross-sectional area, which leads to uneven heating of the aerosol generator as the tobacco near the heating element is overheated, while the tobacco further away is poorly heated.

[0004] Electromagnetic induction heating utilizes electromagnetic induction to generate eddy currents within the material being heated, relying on the energy of these eddy currents to achieve heating. The process of electromagnetic induction heating is actually a combination of electromagnetic induction and heat conduction, with electromagnetic induction playing a dominant role. It influences and, to a certain extent, determines the heat conduction process. The thermal energy required for heat conduction is actually provided by the power of the eddy currents generated during electromagnetic induction. As a non-contact heating method, the induction heating element does not need to be electrically connected to the heating control components, thus offering greater design freedom and making it highly suitable for applications in the field of novel tobacco products. The key components in the principle of electromagnetic induction heating include an induction transmitter with an induction coil and a sensor that acts as the induction heating element.

[0005] Because the coils are evenly and densely distributed around the heating chamber, creating obstruction, the heating chamber can only have one opening in the axial direction of the induction coil for inserting the aerosol-generated product. This makes operations such as temperature measurement, cleaning, and aerosol-generated product identification in the smoking device quite inconvenient. For example, if you want to detect or calibrate the temperature of the heating element, or monitor the temperature of the induction heating element in real time during heating, you can generally only measure the temperature by using a thermocouple in close contact with the induction heating element. However, the thermocouple itself will generate a potential in the magnetic field, affecting the accuracy of the measurement results.

[0006] Therefore, in order to directly measure and calibrate the internal structure of the induction heating aerosol generator while minimizing the impact on the heating magnetic field, a novel induction heating aerosol generator needs to be developed. Summary of the Invention

[0007] The purpose of this invention is to enable direct temperature measurement and calibration of the internal components of an induction heating aerosol generator while minimizing the impact on the heating magnetic field, thus providing a novel induction heating aerosol generator.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] An induction heating aerosol generating device is disclosed, which can heat an aerosol generating article by induction heating to generate an aerosol for inhalation by a user; the induction heating aerosol generating device includes: a housing defining a heating chamber for receiving at least a portion of the aerosol generating article; an inductor including an induction coil; a power supply connected to the induction coil and configured to provide a high-frequency current to the induction coil, wherein in use the induction coil generates a fluctuating electromagnetic field to heat an induction heating element in thermal contact with the aerosol generating article and thereby heat the aerosol generating matrix of the aerosol generating article; characterized in that at least one window without coil enclosure is provided on the side of the induction coil within an effective magnetic field range, and the magnetic flux density attenuation of the induction heating element disposed within the induction coil is less than 10% compared to that of the induction heating element disposed in a fully coiled coil.

[0010] Furthermore, the induction coil consists of a complete turn and a deformed turn, at least a portion of which is disposed on the complete turn. The deformed turn includes a deformed turn region that overlaps with the complete turn in the axial direction, and the deformed turn region forms the window.

[0011] Furthermore, the window formed by the deformed turn region is centrally symmetrical.

[0012] Furthermore, the deformed turn region is located radially outside the complete turn.

[0013] Furthermore, the included angle of the window in the circumferential direction is α, where 5°≤α≤180°.

[0014] Furthermore, the induction coil includes a first turn segment and a second turn segment, the winding direction of the first turn segment is the same as that of the second turn segment, the magnetic field axes of the first turn segment and the second turn segment coincide, and the first turn segment and the second turn segment are connected by a non-helical connecting segment.

[0015] Furthermore, the length of the connecting segment is dn, the inner radius of the first turn segment and the second turn segment is r, and dn / r < 0.8.

[0016] Furthermore, the number of turns in the first turn segment is greater than or equal to the number of turns in the second turn segment.

[0017] Furthermore, the induction coil is wound at an axial angle, i.e., the induction coil has an axial angle δ, thereby providing the window at at least one of the two ends of the induction coil.

[0018] Furthermore, 0 < δ ≤ 20°.

[0019] Furthermore, the induction heating aerosol generating device further includes: a sensor capable of detecting at least one of the following physical quantities: a physical quantity associated with the operating state of the aerosol generating device, a physical quantity associated with the consumer's inhalation action, and a physical quantity associated with the aerosol generating matrix, the sensor obtaining the physical quantity through the window; and a control element that, in use, controls the induction coil to generate a fluctuating electromagnetic field based on the physical quantity measured by the sensor to heat the induction heating element and thereby heat the aerosol generating matrix.

[0020] Furthermore, the sensor includes an infrared temperature sensor configured to measure the temperature of the inductive heating element or the aerosol generating product. The sensor transmits a temperature-related signal to a control element via wired and / or wireless means. The control element controls the induction coil to generate a corresponding fluctuating electromagnetic field based on the temperature, thereby causing the inductive heating element to heat up and heat the aerosol generating matrix.

[0021] Furthermore, the sensor includes an airflow sensor and / or a pressure sensor, which is configured to measure at least one gas parameter among the air pressure inside the heating chamber, the airflow flowing through the heating chamber, and the airflow flowing through the coil-free enclosed area. The sensor transmits a signal related to the gas parameter to a control element via a wired and / or wireless means. The control element starts the aerosol generating device according to the signal, controls the induction coil to generate a corresponding fluctuating electromagnetic field according to the temperature to heat the induction heating element and heat the aerosol generating matrix, and stops the aerosol generating device.

[0022] Furthermore, the sensor includes a camera, which is configured to detect changes in brightness inside the heating chamber to determine whether an aerosol-generating product has been inserted. The sensor transmits signals related to the changes in brightness to a control element via wired and / or wireless means, and the control element starts or stops the aerosol-generating device based on the signals.

[0023] Furthermore, the sensor includes a camera, and the surface of the aerosol-generating product has a barcode indicating the authenticity or type of the aerosol-generating product. The sensor is configured to detect the barcode and transmit a signal related to the authenticity or type of the aerosol-generating product to a control element via wired or wireless means. The control element determines whether to start the smoking device based on the authenticity of the aerosol-generating product or controls the power supply to transmit a corresponding high-frequency current to the induction coil based on the type of aerosol-generating product.

[0024] Furthermore, the aerosol generating device includes an emitter that emits a transmission signal. After the transmission signal reaches the heating chamber or the aerosol generating product, it is converted into a reception signal due to a physical quantity associated with the working state of the aerosol generating device, the consumer's inhalation action, or the aerosol generating matrix. The sensor receives the reception signal to acquire the physical quantity.

[0025] Furthermore, the transmitter includes a light source, the sensor includes a photoelectric converter, and the surface of the aerosol generating matrix has a barcode indicating the authenticity or type of the aerosol generating matrix.

[0026] An aerosol generation system includes an aerosol generation article and an induction heating aerosol generation device as described in any one of the claims.

[0027] An aerosol generating device is used to describe an apparatus that interacts with an aerosol generating matrix of an aerosol generating article to generate an aerosol. Preferably, the aerosol generating device is a smoking device that interacts with the aerosol generating matrix of an aerosol generating article to generate an aerosol that can be directly inhaled into the user's lungs through the user's mouth. The aerosol generating device may be a fixator for a smoking article.

[0028] A sensor is a material that can convert electromagnetic energy into heat. When placed in a undulating electromagnetic field, the eddy currents induced in the sensor cause it to heat up. When an elongated sensor is positioned in thermal contact with the aerosol-generating matrix, the aerosol-generating matrix is ​​heated by the sensor.

[0029] The aerosol generating article is designed to engage with an electrically operated aerosol generating device, including an induction heating source. The induction heating source or sensor generates a fluctuating electromagnetic field to heat a sensor located within the fluctuating electromagnetic field. In use, the aerosol generating article engages with the aerosol generating device such that the sensor is located within the fluctuating electromagnetic field generated by the sensor.

[0030] The length of the receptor is greater than its width or thickness, for example, more than twice its width or thickness. Therefore, the receptor can be described as an elongated receptor. The receptor can be arranged generally longitudinally within the aerosol-generating matrix. This means that the length of the elongated receptor is arranged approximately parallel to the longitudinal direction of the aerosol-generating matrix, for example, within plus or minus 10 degrees. In a preferred embodiment, the elongated receptor can be located at a radial center position within the aerosol-generating matrix and extend along the longitudinal axis of the aerosol-generating matrix.

[0031] The receptor is preferably needle-shaped, strip-shaped, or leaf-shaped. Preferably, the receptor has a length of 5 mm to 15 mm, for example, between 6 mm and 12 mm or between 8 mm and 10 mm. Preferably, the elongated receptor has a length substantially the same as the aerosol-generating matrix. Preferably, the receptor can have a width of 1 mm to 5 mm and a thickness of 0.01 mm to 2 mm, for example, 0.5 mm to 2 mm. A preferred embodiment may have a thickness between 10 micrometers and 500 micrometers, more preferably between 10 micrometers and 100 micrometers. If the receptor has a constant cross-section, such as a circular cross-section, it has a preferred width or diameter of 1 mm to 5 mm.

[0032] The sensor can be made of any material capable of being heated inductively to a temperature sufficient to cause the aerosol-generating matrix to generate aerosols. Preferred sensors include metals or carbon. Preferred sensors may include ferromagnetic materials, such as ferrite, ferromagnetic steel, or stainless steel. Suitable sensors may be aluminum or may include aluminum. Preferred sensors may be made of 400 series stainless steel, such as grade 410, 420, or 430 stainless steel. Different materials will consume different amounts of energy when placed in an electromagnetic field with similar frequency and field strength. Therefore, parameters of the sensor, such as material type, length, width, and thickness, can be varied within a known electromagnetic field to provide the desired energy consumption.

[0033] The preferred sensor may be heated to a temperature exceeding 250 degrees Celsius. A suitable sensor may include a non-metallic core having a metallic layer disposed on the non-metallic core, such as metallic traces formed on the surface of a ceramic core.

[0034] The sensor may have an outer protective layer, such as a ceramic or glass protective layer encapsulating the elongated sensor, thereby forming a complete heating element. The sensor may include a protective coating formed of glass, ceramic, or inert metal on the core of the sensor material.

[0035] The receptor is arranged in thermal contact with the aerosol-generating matrix. Therefore, when the receptor is heated, the aerosol-generating matrix is ​​heated and forms an aerosol. In one embodiment, a heating element including the receptor is inserted into the aerosol-generating matrix, and the aerosol-generating device may include one or more elongated heating elements. In another embodiment, the aerosol-generating matrix may include the receptor; alternatively, the aerosol-generating matrix may include multiple receptors, and the receptors may be elongated, granular, mesh-like, radial, tubular, hourglass-shaped, spiral, etc.

[0036] The induction coil material should be a material with good conductivity, such as metal; in addition, in this patent, the induction coil material should also have good elastic deformation ability, and can be spring steel, gold, silver or other metals.

[0037] The power source can be any suitable power source, such as a DC voltage source, like a battery. In one embodiment, the power source is a lithium-ion battery. Alternatively, the power source can be a nickel-metal hydride battery, a nickel-cadmium battery, or a lithium-based battery, such as a lithium cobalt, lithium iron phosphate, lithium titanate, or lithium polymer battery.

[0038] The control element can be a simple switch. Alternatively, the control element can be a circuit and may include one or more microprocessors or microcontrollers.

[0039] An aerosol generation system may include an aerosol generation device and one or more aerosol generation articles, wherein the aerosol generation device is configured with a corresponding number of heating chambers to contain the aerosol generation articles.

[0040] This invention provides a novel induction heating aerosol generating device. By setting a window on the induction coil to connect to the outside world, it can perform temperature measurement, cleaning, and aerosol product identification more efficiently. Moreover, its structure can minimize magnetic leakage and reduce the impact on the magnetic field inside the coil itself. Attached Figure Description

[0041] The above-described technical content of the present invention and the following detailed embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the drawings are merely examples of the claimed technical solutions. In the drawings, the same reference numerals represent the same or similar elements.

[0042] Figure 1 This is a perspective view of the induction coil according to the first embodiment of the present invention;

[0043] Figure 2 This is a cross-sectional view of the induction coil according to the first embodiment of the present invention;

[0044] Figure 3 This is a side view of the induction coil according to the first embodiment of the present invention;

[0045] Figure 4 This is a front view of the induction coil according to the first embodiment of the present invention;

[0046] Figure 5A This is a diagram showing the magnetic field lines distribution of an induction coil in the prior art;

[0047] Figure 5B This is a magnetic field distribution diagram of the induction coil according to the first embodiment of the present invention;

[0048] Figure 6A This is a 3D diagram of an induction coil in the prior art;

[0049] Figure 6B This is a perspective view of the induction coil according to the first embodiment of the present invention;

[0050] Figure 7A yes Figure 6A Magnetic field strength diagram on section aa;

[0051] Figure 7B yes Figure 6B Magnetic field strength diagram on the middle bb section;

[0052] Figure 8A yes Figure 7A Draw a magnetic field strength distribution diagram by taking a straight line from the center;

[0053] Figure 8B yes Figure 7B Draw a magnetic field strength distribution diagram by taking a straight line from the center;

[0054] Figure 9A This is a diagram showing the magnetic field distribution of an induction coil with an induction heating element in the prior art;

[0055] Figure 9B This is a magnetic field distribution diagram of the induction coil with an induction heating element according to the first embodiment of the present invention;

[0056] Figure 10A yes Figure 9A Magnetic flux density distribution diagram of the induction heating element;

[0057] Figure 10B yes Figure 9B Magnetic flux density distribution diagram of the induction heating element;

[0058] Figure 11 This is a cross-sectional view of the heating chamber according to the first embodiment of the present invention;

[0059] Figure 12 This is a cross-sectional view of the heating chamber according to the second embodiment of the present invention;

[0060] Figure 13This is a perspective view of the induction coil according to the third embodiment of the present invention;

[0061] Figure 14 This is a side view of the induction coil according to the third embodiment of the present invention;

[0062] Figure 15 This is a cross-sectional view of the heating chamber according to the third embodiment of the present invention;

[0063] Figure 16 This is a perspective view of the induction coil according to the fourth embodiment of the present invention;

[0064] Figure 17 This is a side view of the induction coil according to the fourth embodiment of the present invention;

[0065] Figure 18 This is a cross-sectional view of the heating chamber according to the fourth embodiment of the present invention.

[0066] The reference numerals in the attached figures are explained as follows:

[0067] Heating chambers: 1, 2, 3

[0068] Induction coils: 100, 200, 300

[0069] Windows: 101, 201, 301, 301

[0070] Induction heating element: 102, 202, 302

[0071] Extractor: 103

[0072] Support: 104, 204, 304

[0073] First power connection terminals: 111, 211

[0074] Second power connection terminals: 112, 212

[0075] Deformation area: 121

[0076] Complete turn area: 122

[0077] Deformed turns: 123, 124

[0078] Complete turns: 125, 126

[0079] First section: 221

[0080] Second ramp: 222

[0081] Connector segment: 223 Detailed Implementation

[0082] The following detailed description of the features and advantages of the present invention is sufficient to enable those skilled in the art to understand the technical content of the present invention and to implement it accordingly. Furthermore, based on this specification, claims, and drawings, those skilled in the art can easily understand the related objectives and advantages of the present invention.

[0083] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0084] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0085] To make the objectives, technical solutions, and advantages of this patent clearer, the embodiments of this patent will be described in further detail below with reference to the accompanying drawings.

[0086] The induction heating aerosol generating apparatus disclosed in this invention includes a housing (not shown), a power supply (not shown), a control element (not shown), and heating chambers (1, 2, 3). The power supply and control element are disposed in the main body (not shown) of the aerosol generating apparatus. Heating chamber 1 is used to contain the aerosol generating article (i.e., the aerosol generating article) during operation. Heating chambers (1, 2, 3) include induction coils (100, 200, 300) for emitting energy, induction heating elements (102, 202, 302) for receiving energy, and an upper opening for inserting the aerosol generating article. Induction coils (100, 200, 300) have magnetic field axes and are generally arranged to surround at least a portion of heating chambers (1, 2, 3) and induction heating elements (102, 202, 302). A power supply is connected to the induction coils (100, 200, 300) and configured to provide high-frequency current to the induction coils (100, 200, 300) under the control of a controller. During operation, an aerosol generating article is inserted into the heating chambers (1, 2, 3), and the induction heating elements (102, 202, 302) come into thermal contact with the aerosol generating article. The power supply provides high-frequency current to the induction coils (100, 200, 300), thereby generating an induced electric field and forming an induced current in the induction heating elements (102, 202, 302). The induction heating elements (102, 202, 302) heat the aerosol generating article. The induction coil (100, 200, 300) can be wound with a single wire, or with multiple windings connected in series by multiple wires, or with a flat wire coiled together. The wire can be flat, circular, or square in cross-section; the cross-sectional shape of the wire is not limited to these. The induction coil (100, 200, 300) is wound with a single wire, one end of which serves as a first power supply connection terminal (111, 211), and the other end serves as a second power supply connection terminal (112, 212) connected to the other pole of the power supply. The side of the induction coil (100, 200, 300) has at least one window (101, 201, 301, 301') without coil enclosure within the effective magnetic field range. The induction coils (100, 200, 300) are mounted on the brackets (104, 204, 304). The brackets (104, 204, 304) and the windows (101, 201, 301, 301') should have a notch or at least a semi-transparent window in their relative positions.

[0087] like Figure 1-4The first embodiment of the present invention shown includes an induction coil 100. The induction coil 100 is wound with several turns of wire. At the top and bottom, there are two turns, nz1 and nz2, which are normally wound one full turn, forming complete turns 125 and 126. In the middle, there is a deformed turn 123, which is formed during the single-turn winding process by partially flipping the wire to the side and upward, creating a deformed turn region 121 that is radially located outside the cylinder of the complete turn region and axially overlaps with the complete turn region nz1. Similarly, the nz2 turn 124 is a deformed turn, which is formed during the single-turn winding process by partially flipping to the side and downward, creating a deformed turn region 121 that is radially located outside the cylinder of the complete turn region 122 and axially overlaps with the complete turn 126. At this time, the deformed turn region 121 forms a window 101 on the side of the coil, through which the sensor can obtain information about the interior of the induction coil 100.

[0088] The window 101 formed by the deformed turn region 121 can be a centrally symmetrical shape such as a rectangle, circle, or rhombus. The included angle of the window in the circumferential direction is α, where 5°≤α≤180°, and the length of the window in the axial direction is dn, preferably 1mm≤dn≤4mm. In the radial direction, the deformed turn region 121 can be located outside or inside the complete turns 125 and 126. Preferably, the deformed turn region is located outside the complete turns in the radial direction.

[0089] Figure 5A The image shows the distribution of magnetic field lines generated when a conventional single-turn coil is energized. Figure 5B The diagram shows the distribution of magnetic field lines generated when the induction coil 100 is energized. The induction coil 100 exhibits only partial magnetic leakage near window 102; within most of the interior of the induction coil 100, the magnetic field it generates is essentially the same as that of a conventional single-turn coil in the prior art. In particular, the area near the coil axis is almost completely unaffected.

[0090] Figure 6A and Figure 6B The cross-section shown is taken between the ordinary coil and the induction coil 100, and the result is... Figure 7A and Figure 7B The diagram shows a comparison of the magnitude and distribution of magnetic flux density across the cross section of a standard same-turn coil and an induction coil 100 when the same current flows through them. Figure 7A The magnetic field strength in region 101 of the central window is slightly lower than in other areas. A center line is drawn through this region, and the magnetic field strength at that location is obtained. Figure 8A and Figure 8B The magnetic field strength value. In the intermediate region, the magnetic field strength is basically unaffected.

[0091] like Figure 9A and Figure 9BAs shown, during the use of the appliance, the middle of the coil is not a completely airy region; an induction heating element is present. Most of the magnetic field lines pass through the induction heating element, while there are fewer magnetic field lines in other areas. Since the characteristics of the heating system are mainly determined by the induction heating element, the impact of magnetic leakage at window 100 will be further reduced.

[0092] like Figure 10A and Figure 10B As shown, the magnetic flux density distribution of the induction heating element along the central axis of the ordinary coil and the induction coil 100 is illustrated. The magnetic flux density attenuation of the induction heating element disposed within the induction coil is less than 10% compared to that disposed within a fully wound solenoid. Furthermore, the attenuation is less than 5%. Therefore, the induction coil disclosed in this invention can essentially replace a fully wound solenoid as the coil of an induction heating appliance, while also allowing light to pass through the specially wound notch for infrared calibration and temperature measurement.

[0093] like Figure 11 The diagram shows a heating chamber 1 according to a first embodiment of the present invention, wherein the induction heating element 102 is an elongated heating element that comes into thermal contact with the interior of the aerosol-generating product during use. This embodiment further includes an extractor 103, which allows the user to completely remove the aerosol-generating product after it has been consumed, preventing tobacco flakes or tobacco shreds, which serve as the aerosol-generating matrix, from falling into the heating chamber 1. To enable the sensor to function properly, the extractor should have an extractor window (not shown) corresponding to the window, or a transparent or semi-transparent extractor window at a corresponding position on the window. The extractor window should have a transmittance of more than 50% for signals acceptable to the sensor, preferably more than 80%.

[0094] like Figure 12 The diagram shows a heating chamber 1 according to a second embodiment of the present invention, wherein the induction heating element 102 is a circumferential heating element that comes into thermal contact with the exterior of the aerosol-generating product during use. Furthermore, when the sensor needs to read physical quantities related to the aerosol-generating product, an induction heating element notch should be provided at the corresponding position of the induction heating element and the window.

[0095] like Figure 13 and Figure 14The diagram shows an induction coil 200 according to a third embodiment of the present invention. The induction coil 200 includes a first turn segment 221 and a second turn segment 222 with coincident magnetic field axes. The first turn segment 221 and the second turn segment 222 are connected by a non-spiral winding connecting segment 223. The connecting segment 223 can be in a straight line or other non-spiral winding shape, and it can be parallel to the axis of the induction coil 200 or at a certain angle. The length of the connecting segment 223 is dn, and the size of dn determines the size of the window 201. Preferably, 1mm ≤ dn ≤ 4mm, within which the heating efficiency of the induction coil 200 attenuates the least. The first turn segment 221 and the second turn segment 222 are wound in the same direction, i.e., both are wound clockwise or counterclockwise. The first turn segment 221 and the second turn segment 222 have the same radius, with an inner radius of r. Preferably, dn / r < 0.8. Preferably, dn / r < 0.5. Preferably, dn / r < 0.3. Preferably, the number of turns in the first turn segment 221 and the second turn segment 222 is the same.

[0096] like Figure 15 The image shows a heating chamber 2 according to a third embodiment of the present invention, wherein the induction heating element 202 is a central heating element, which makes thermal contact with the interior of the aerosol generating product during use.

[0097] like Figure 16 and Figure 17 The diagram shows an induction coil 300 according to a fourth embodiment of the present invention. The induction coil 300 is wound at an angle relative to the axial direction, described by an angle δ. There is a height difference hn between the highest and lowest points of the same turn, which is the height of the two windows 301 and 301' formed opposite to each other at both ends of the induction coil. Preferably, 1mm ≤ hn ≤ 4mm.

[0098] To avoid affecting the efficiency of induction heating, the height difference hn cannot be too large. Therefore, preferably, δ < 20°.

[0099] like Figure 18 The heating chamber 3 is shown in the fourth embodiment of the present invention. Since the areas illuminated by windows 301 and 301' are the edges of the induction heating element 302, generally, once the relative positions of the induction coil 300 and the induction heating element 302 are fixed, the temperature distribution at different positions on the induction heating element 302 is determined. The center temperature of the induction heating element 302 can be estimated from the temperature at the edge of the induction heating element 302, and thus the control element can control the temperature of the induction heating element 302.

[0100] The aerosol generating device further includes a sensor that can detect physical quantities associated with the operating status of the aerosol generating device, the consumer's inhalation action, or the aerosol generating matrix by receiving substances emitted from the windows (101, 201, 301, 301'). The control element determines whether to start the device, how to control the power supply to transmit a corresponding high-frequency current to the induction coil, or to stop the device from operating based on the signal.

[0101] In one specific embodiment, the sensor includes an infrared temperature sensor configured to measure the temperature of the induction heating element or the aerosol-generating article. In existing induction heating appliances, resistance temperature measurement is typically used to monitor the heating temperature. However, the thermocouple itself generates a potential in the magnetic field, affecting the accuracy of the measurement results. Therefore, appliances using electromagnetic heating technology ideally use infrared temperature measurement and calibration. However, because the coils are densely distributed around the heating chamber, they create obstructions, making it difficult to directly illuminate the sensing element with the infrared probe. An infrared sensor can be used to measure the temperature of the induction heating element in real time through a window, and then compare and calibrate the measurement with the current temperature control curve.

[0102] In another specific embodiment, the sensor includes an infrared temperature sensor configured to measure the temperature of the inductive heating element or the aerosol generating article. The sensor transmits a signal related to the temperature of the inductive heating element or the aerosol generating article to a control element via a wired or wireless means. The control element controls the power supply to transmit a corresponding high-frequency current to the induction coil according to the signal, so that the induction coil can generate a corresponding fluctuating electromagnetic field according to the physical quantity measured by the sensor to heat the inductive heating element and thus heat the aerosol generating matrix.

[0103] In another specific embodiment, the sensor includes an airflow sensor or a pressure sensor, which is configured to measure the air pressure inside the heating chamber, the airflow flowing through the heating chamber, or the airflow flowing through the window. The sensor transmits a signal related to the airflow or pressure to the control element via a wired or wireless means. The control element determines whether to start the smoking device based on the signal or transmits a corresponding high-frequency current to the induction coil based on the airflow magnitude or pressure change. Thus, the induction coil can generate a corresponding fluctuating electromagnetic field based on the physical quantity measured by the sensor to heat the induction heating element and thereby heat the aerosol to generate a matrix.

[0104] In another specific embodiment, the sensor includes a camera, which is configured to detect changes in brightness inside the heating chamber to determine whether an aerosol-generating product has been inserted. The sensor transmits a signal related to the insertion of the aerosol-generating product to the control element via a wired or wireless means. The control element starts the smoking device based on the signal and controls the power supply to transmit a corresponding high-frequency current to the induction coil. The induction coil can then generate a corresponding fluctuating electromagnetic field based on the physical quantity measured by the sensor to heat the induction heating element and thus heat the aerosol-generating matrix.

[0105] In another specific embodiment, the surface of the aerosol-generating product has a QR code indicating the authenticity or type of the aerosol-generating product. The sensor includes a camera and is configured to detect the barcode on the cigarette paper of the aerosol-generating product to determine its authenticity or type. The barcode can be one-dimensional or two-dimensional. The sensor transmits signals related to the authenticity or type of the aerosol-generating product to the control element via wired or wireless means. The control element decides whether to start the smoking device based on the authenticity of the aerosol-generating product or controls the power supply to transmit a corresponding high-frequency current to the induction coil based on the type of the aerosol-generating product. Thus, the induction coil can generate a corresponding fluctuating electromagnetic field based on the physical quantity measured by the sensor to heat the induction heating element and thereby heat the aerosol-generating matrix.

[0106] In another specific embodiment, the sensor includes a camera, which is configured to detect changes in the color-changing pattern on the heated cigarette paper of the aerosol-generating product to determine the heating temperature of the aerosol-generating product or whether the aerosol-generating product has been consumed. The sensor transmits a signal related to the heating temperature of the aerosol-generating product or whether the aerosol-generating product has been consumed to a control element via a wired or wireless means. The control element controls the power supply to transmit a corresponding high-frequency current to the induction coil according to the signal, so that the induction coil can generate a corresponding fluctuating electromagnetic field according to the physical quantity measured by the sensor to heat the induction heating element and then heat the aerosol-generating matrix, or the control element stops the operation of the cigarette device according to the signal.

[0107] The terminology and expressions used herein are for descriptive purposes only, and the invention should not be limited to these terms and expressions. The use of these terms and expressions does not imply the exclusion of any illustrative and descriptive equivalents (or parts thereof), and it should be recognized that various modifications that may exist should also be included within the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be considered to cover all such equivalents.

[0108] Similarly, it should be noted that although the present invention has been described with reference to the specific embodiments described above, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions can be made without departing from the spirit of the present invention. Therefore, any changes or modifications to the above embodiments within the scope of the essential spirit of the present invention will fall within the scope of the claims of the present invention.

Claims

1. An induction heating aerosol generating device capable of heating an aerosol generating article by means of induction heating to generate an aerosol for a user to draw upon; The induction heating aerosol-generating device comprises: a housing defining a heating chamber for receiving at least a portion of the aerosol-generating article; an inductor comprising an induction coil; a power supply connected to the induction coil and configured to provide a high-frequency current to the induction coil, in use, the induction coil generating an oscillating electromagnetic field to heat an induction heating element in thermal contact with the aerosol-generating article and in turn heat an aerosol-generating substrate of the aerosol-generating article; characterized in that a side of the induction coil is provided with at least one coil-free window in an effective magnetic field range, the induction coil is composed of a complete turn and a deformed turn, at least a portion of the deformed turn is arranged on the complete turn, the deformed turn comprises a deformed turn region, the deformed turn region partially overlaps the complete turn in an axial direction, and the deformed turn region forms the window; The induction heating element arranged in the induction coil has a magnetic flux density decay of less than 10% compared to the induction heating element arranged in a complete solenoid.

2. The induction heating aerosol generating device of claim 1, wherein, The window formed by the deformed turn region is centrally symmetric.

3. An induction heating aerosol-generating device according to claim 2, wherein The deformed turn region is located radially outside the complete turn.

4. The induction heating aerosol generating device of claim 1, wherein, The window has an included angle of α in the circumferential direction, 5°≤α≤180°.

5. The induction heating aerosol generating device of claim 1, wherein, The induction heating aerosol-generating device further comprises: a sensor capable of detecting at least one of the following physical quantities: a physical quantity associated with the working state of the aerosol-generating device, a physical quantity associated with the consumer's puffing action, and a physical quantity associated with the aerosol-generating substrate, the sensor obtaining the physical quantity through the window; a control element that, in use, controls the induction coil to generate an oscillating electromagnetic field according to the physical quantity measured by the sensor to heat the induction heating element and in turn heat the aerosol-generating substrate.

6. An induction heating aerosol-generating device according to claim 5, wherein The sensor comprises an infrared temperature sensor configured to measure the temperature of the induction heating element or the aerosol-generating article, the sensor transmits a signal related to the temperature to the control element by wired and / or wireless means, and the control element controls the induction coil to generate a corresponding oscillating electromagnetic field according to the temperature to heat the induction heating element and heat the aerosol-generating substrate according to the signal.

7. The induction heating aerosol generating device of claim 5, wherein, The sensor comprises an airflow sensor and / or a gas pressure sensor configured to measure at least one gas parameter of the gas pressure inside the heating chamber, the airflow through the heating chamber, and the airflow through the coil-free window, the sensor transmits a signal related to the gas parameter to the control element by wired and / or wireless means, and the control element starts the aerosol-generating device, controls the induction coil to generate a corresponding oscillating electromagnetic field according to the gas parameter to heat the induction heating element and heat the aerosol-generating substrate, and stops the aerosol-generating device according to the signal.

8. The induction heating aerosol generating device of claim 5, wherein, The sensor comprises a camera, the sensor is configured to detect the light change inside the heating chamber to determine whether the aerosol generating article is inserted, the sensor transmits a signal related to the light change to the control element through wired and / or wireless mode, and the control element starts or stops the aerosol generating device according to the signal.

9. The induction heating aerosol generating device of claim 5, wherein, The sensor comprises a camera, the surface of the aerosol generating article has a barcode indicating the authenticity or category of the aerosol generating article, the sensor is configured to detect the barcode and transmit a signal related to the authenticity or category of the aerosol generating article to the control element through wired or wireless mode, and the control element determines whether to start the smoking set according to the authenticity of the aerosol generating article or controls the power supply to transmit corresponding high-frequency current to the induction coil according to the category of the aerosol generating article.

10. The induction heating aerosol generating device of claim 5, wherein, The aerosol generating device comprises a transmitter, the transmitter emits a transmission signal, and the transmission signal is converted into a reception signal due to a physical quantity associated with the working state of the aerosol generating device, the puffing action of the consumer or the aerosol generating substrate after reaching the heating chamber or the aerosol generating article, and the sensor receives the reception signal to obtain the physical quantity.

11. An induction heating aerosol-generating device according to claim 10, wherein The transmitter comprises a light source, the sensor comprises a photoelectric converter, and the surface of the aerosol generating substrate has a barcode indicating the authenticity or category of the aerosol generating substrate.

12. An aerosol generating system comprising an aerosol generating article and an inductively heated aerosol generating device according to any one of claims 1-11.

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