An electromagnetic induction heating substrate and system thereof

Abstract

The present invention discloses an electromagnetic induction heating substrate, which is used for electromagnetic induction heating of an aerosol generating device. The substrate comprises a first sheet-like induction heating body and a second sheet-like induction heating body, which are integrally formed, circumferentially distributed and commonly connected to a central portion. The first sheet-like induction heating body comprises a reverse extension portion, and the second sheet-like induction heating body has a dividing line groove near the central portion. The dividing line groove is not closed near the central portion of the first sheet-like induction heating body, and the dividing line groove forms the outline of the reverse extension portion. When the first sheet-like induction heating body is folded relative to the central portion, the reverse extension portion is folded in the reverse direction relative to the central portion.

Description

Technical Field

[0001] The invention relates to the field of novel tobacco, and in particular to an electromagnetic induction heating substrate and a system thereof. Background Art

[0002] Heated cigarettes are a type of new tobacco product and an option for consumers to reduce the harm caused by traditional tobacco. Traditional cigarettes are usually randomly arranged. In the research and development of new tobacco, in order to maximize the flavor of traditional tobacco, one research and development direction is to directly improve the heatable (heatable) on the basis of traditional cigarettes. However, the technical problem that comes with it is that compared with existing internal heating devices, it is difficult to insert random cigarettes, and external heating devices will have problems such as insufficient heating.

[0003] At present, the heating devices for cigarettes on the market mainly use the principle of resistance heating, and the heating methods mainly include inner core heating, outer peripheral heating and internal and external mixed heating. In order to facilitate the insertion of cigarettes, inner core heating devices usually use a needle-type heating body, and the cross-sectional area of ​​the heating body needs to be small, so that during the heating process of the cigarette, the tobacco close to the heating body is overheated, while the tobacco far away from the heating body is difficult to be heated, resulting in uneven heating of the cigarette.

[0004] Increasing the contact area between the heating element and the smoke medium can improve the above problems, but directly changing the shape of the heating element to increase the contact area will make it difficult to insert the cigarette. At the same time, changing the shape of the resistive heating element, because each heating element needs to be connected to the power system, any change to the heating element will easily lead to too complicated internal wiring of the smoking device, which is not conducive to the miniaturization and stable operation of the device.

[0005] As an efficient heating principle, electromagnetic heating is very suitable for application in heating equipment. At the same time, the heating uniformity effect can be easily optimized by changing the shape of the electromagnetic induction heating substrate. However, the electromagnetic induction heating substrate has a strong thermal conductivity, and the temperature measurement and control in the non-working area is not accurate enough.

[0006] Therefore, in order to conveniently produce an electromagnetic induction heating substrate with a circumferential distribution shape, the heating effect is optimized by utilizing the circumferential distribution shape of the electromagnetic induction heating substrate. At the same time, it is necessary to be able to measure and feedback the temperature in the working area to make the temperature control more accurate, and in order to make the components more compact and save space in small devices such as aerosol generating devices, it is necessary to develop an electromagnetic induction heating system. Summary of the invention

[0007] The purpose of the present invention is to increase the heating area of ​​the aerosol generating product so that the smoke medium is fully heated without increasing the complexity and volume of the aerosol generating device. At the same time, the heating substrate is easy to prepare and has a simple structure.

[0008] In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

[0009] An electromagnetic induction heating substrate, used for electromagnetic induction heating of an aerosol generating device, comprises at least one first sheet-shaped induction heating body and at least one second sheet-shaped induction heating body,

[0010] The first sheet-shaped induction heating body and the second sheet-shaped induction heating body are integrally formed, circumferentially distributed and connected together at the center.

[0011] The first sheet-shaped induction heating body comprises a reverse extension portion,

[0012] The second sheet-shaped induction heating body has a dividing line groove near the center portion, the dividing line groove is not closed near the center portion of the first sheet-shaped induction heating body, and the dividing line groove forms the outline of the reverse extension portion.

[0013] The first sheet-like induction heating body and the second sheet-like induction heating body are folded in the same direction relative to the center portion to be substantially perpendicular to the center portion. When the first sheet-like induction heating body is folded relative to the center portion, the reverse extending portion is folded in the reverse direction relative to the center portion.

[0014] Furthermore, the heating substrate comprises the same number of bending lines N as that of the sheet-like induction heating body.

[0015] Furthermore, the bending line N is located at the junction of the first sheet-shaped induction heating body and the second sheet-shaped induction heating body and the central portion.

[0016] Furthermore, the first sheet-shaped induction heating body and the second sheet-shaped induction heating body are folded along the bending line N relative to the central portion.

[0017] Furthermore, the first sheet-shaped induction heating body and the second sheet-shaped induction heating body, with respect to the bending line N, the parts away from the central part constitute a heating zone for heating.

[0018] Furthermore, the reverse extension portion is opposite to the heating zone along the bending line N.

[0019] Furthermore, a temperature sensor is covered on the surface of the heating substrate.

[0020] Furthermore, the temperature sensor is arranged on the first sheet-shaped induction heating body.

[0021] Furthermore, the temperature sensor has a temperature measuring electrode.

[0022] Furthermore, the temperature measuring electrode is located on the reverse extending portion.

[0023] Furthermore, the temperature sensor is composed of a high temperature resistant insulating coating, a temperature measuring circuit, a high temperature resistant insulating coating and a thin metal sheet.

[0024] Furthermore, the high temperature resistant insulating coating, the temperature measuring circuit, the high temperature resistant insulating coating and the thin metal sheet are sequentially coated onto the first sheet-shaped induction heating body.

[0025] Furthermore, a temperature measuring circuit extends from the heating zone to the reverse extending portion.

[0026] Furthermore, after vacuuming and isostatic pressing, the thin metal sheet and the first sheet-shaped induction heating body are closely fitted.

[0027] Furthermore, the temperature measuring circuit and the first sheet-shaped induction heating body of the high-temperature resistant insulating coating are tightly fitted.

[0028] Furthermore, sintering is carried out under reducing conditions, and finally a protective glaze layer is coated on the outer surface of the sintered heating body.

[0029] Furthermore, a line M connecting the endpoints of the unclosed portion of the dividing line groove forms an angle of 90° with the extending direction of the first sheet-shaped induction heating body.

[0030] Furthermore, the electromagnetic induction heating substrate also includes a base

[0031] Further, the base circumferentially surrounds and engages the central portion.

[0032] Furthermore, the base basically does not cover the reverse extension portion and the shielding temperature measuring electrode and the heating area.

[0033] Furthermore, the base is made of a material that is high temperature resistant and insensitive to magnetic induction.

[0034] Furthermore, the base is made of PEEK.

[0035] Furthermore, the base is made of high temperature resistant ceramics, such as zirconium oxide, aluminum oxide, etc.

[0036] An induction heating system comprises any one of the above described heating substrates and an electromagnetic induction coil, wherein a heating area in the heating substrate is placed in a changing magnetic field generated by the electromagnetic induction coil for induction heating.

[0037] An aerosol generating device comprises the above-mentioned heating system, a housing, a power supply, a control circuit and the like.

[0038] A method for manufacturing any one of the above-mentioned electromagnetic induction heating substrates, comprising: preparing a metal sheet having the desired shape of the electromagnetic induction heating substrate, the metal sheet comprising a central portion and a plurality of heating bodies extending outward from the central portion; cutting an open dividing line groove within the central portion of the metal sheet, so that the dividing line groove is not closed at a junction position close to the central portion and at least one of the first sheet-like induction heating bodies, and a line M connecting the endpoints of the open position is substantially 90° from the extension direction of at least one of the first sheet-like induction heating bodies from the central portion; bending the at least one first sheet-like induction heating body so that it is bent substantially perpendicularly relative to the central portion, and at the same time, a reverse extension portion defined by the dividing line groove is reversely bent together with the at least one heating body relative to the central portion to be substantially perpendicular, thereby maintaining the at least one heating body in the same plane; bending the remaining heating bodies so that they are bent substantially perpendicularly relative to the central portion in the same manner as the at least one heating body.

[0039] Furthermore, after the bending process, a high temperature resistant insulating coating, a temperature measuring circuit, a high temperature resistant insulating coating and a thin metal sheet are sequentially coated on the at least one first sheet-shaped induction heating body, and the temperature measuring circuit extends from the at least one heating body to the reverse extension portion.

[0040] Furthermore, the thin metal sheet is closely fitted to the at least one heating body coated with the high-temperature resistant insulating coating, the temperature measuring circuit and the high-temperature resistant insulating coating by at least vacuuming and isostatic pressing, and is sintered under reducing conditions.

[0041] Furthermore, a protective glaze layer is coated on the outer surface of the heating body after sintering.

[0042] Furthermore, the base is finally wrapped around the circumference and joined to the central portion, so that the base basically does not cover the temperature measuring electrodes and the plurality of heating bodies.

[0043] Among them, the aerosol-generating article is a smoking article, comprising an aerosol-forming substrate which, upon heating, generates an aerosol which is directly inhalable into the lungs of a user through the user's mouth.

[0044] Preferably, the aerosol-forming substrate is a solid aerosol-forming substrate.The aerosol-forming substrate may comprise both solid and liquid components.

[0045] Preferably, the aerosol-forming substrate comprises nicotine. In some preferred embodiments, the aerosol-forming substrate comprises tobacco. For example, the aerosol-forming material may be formed from a sheet of homogenized tobacco.

[0046] Alternatively or additionally, the aerosol-forming substrate may comprise a tobacco-free aerosol-forming material.For example, the aerosol-forming material may be a sheet comprising nicotine salt and an aerosol former.

[0047] If the aerosol-forming substrate is a solid aerosol-forming substrate, the solid aerosol-forming substrate may comprise one or more of a powder, granules, pellets, fragments, strips, rods or sheets containing one or more of herb leaves, tobacco leaves, tobacco ribs, flat tobacco and homogenized tobacco.

[0048] Preferably, the aerosol-forming substrate comprises a plug comprising a gathered sheet of homogenised tobacco material or other aerosol-forming material surrounded by a wrapper.

[0049] In this patent, aerosol former is used to describe any suitable known compound or mixture of compounds which, in use, promotes the formation of an aerosol and which is substantially resistant to thermal degradation at the operating temperature of the aerosol-generating article.

[0050] Suitable aerosol formers are known in the art and include, but are not limited to, polyols such as propylene glycol, triethylene glycol, 1,3-butylene glycol and glycerol; esters of polyols such as glycerol monoacetate, glycerol diacetate or glycerol triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred aerosol formers are polyols or mixtures thereof such as propylene glycol, triethylene glycol, 1,3-butylene glycol, and most preferably glycerol.

[0051] The aerosol-forming substrate may comprise a single aerosol-forming agent. Alternatively, the aerosol-forming substrate may comprise a combination of two or more aerosol-forming agents.

[0052] Preferably, the aerosol-forming substrate has an aerosol-forming agent content of greater than 5% by dry weight. More preferably, the aerosol-forming substrate may have an aerosol-forming agent content of between about 5% and about 30% by dry weight. In one embodiment, the aerosol-forming substrate has an aerosol-forming agent content of about 20% by dry weight.

[0053] Aerosol-forming substrates including homogenised tobacco sheets for use in aerosol-generating articles may be manufactured by roll-forming, slurry-making and paper-making processes known in the art.

[0054] Aerosol-forming articles may have the appearance of conventional cigarettes, and cigarette articles such as cigarettes and their specifications are usually named according to the length of the cigarette, as described below. The so-called "standard" usually refers to a cigarette in the range of 68mm to 75mm, such as a cigarette with a length of about 68mm to about 72mm, the so-called "short" or "mini" refers to a cigarette with a length of less than 68mm, the so-called "oversize" usually refers to a cigarette in the range of 75mm to 91mm, such as a cigarette with a length of about 79mm to about 88mm, the so-called "long" or "extended" usually refers to a cigarette in the range of 91mm to 105mm, such as a cigarette with a length of about 94mm to about 101mm, and the so-called "extra long" usually refers to a cigarette with a length of about 110mm to about 121mm. In addition, cigarette articles are named according to the circumference of the cigarette, as described below. The so-called "standard" refers to a cigarette with an outer circumference of about 23mm to 25mm, the so-called "coarse" refers to a cigarette with an outer circumference of more than 25mm, the so-called "thin" refers to a cigarette with an outer circumference of about 22mm to 23mm, the so-called "slender" refers to a cigarette with an outer circumference of about 19mm to 22mm, the so-called "superfine" refers to a cigarette with an outer circumference of about 16mm to 19mm, and the so-called "fine" refers to a cigarette with an outer circumference of less than about 16mm. Therefore, over-standard and super-fine cigarettes have, for example, a length of about 83mm and an outer circumference of about 17mm. Standard and over-standard cigarettes, that is, cigarettes with a length of 75mm to 91mm and an outer circumference of 23mm to 25mm, are favored by many customers. Cigarette articles of various specifications can also be manufactured with filters of different lengths. Usually, short filters are used for cigarette articles of specifications with short length and outer circumference. Typically, the filter length ranges from 15 mm for "short" and "standard" cigarettes to 30 mm for "extra long" and "super slim" cigarettes. The tipping paper in the longitudinal direction of the filter cigarette is longer than the filter, for example 3 to 10 mm.

[0055] Preferably, the aerosol-forming article comprises an aerosol-forming substrate, a support element, an aerosol-cooling element and a mouthpiece. Preferably, the aerosol-forming substrate, the support element, the aerosol-cooling element and the mouthpiece are substantially cylindrical and have substantially comparable outer diameters. For example, having an outer diameter of at least 5 mm. Preferably, having an outer diameter of between about 5 mm and about 12 mm, such as between about 5 mm and about 10 mm or between about 6 mm and about 8 mm. In a preferred embodiment, having an outer diameter of 7.2 mm + / - 10%.

[0056] Preferably, the aerosol-forming substrate may have a length of between about 5 mm and about 15 mm, for example between about 8 mm and about 12 mm. In a preferred embodiment, the aerosol-forming substrate has a length of about 12 mm.

[0057] The support element may be located immediately downstream of the aerosol-forming substrate and may be in close proximity to the aerosol-forming substrate.

[0058] The support element may be formed of any suitable material or combination of materials. For example, the support element may be formed of one or more materials selected from the group consisting of: cellulose acetate; paperboard; curled paper, such as curled heat-resistant paper or curled parchment paper; and polymeric materials, such as low-density polyethylene (LDPE). In a preferred embodiment, the support element is formed of cellulose acetate.

[0059] The support element may comprise a hollow tubular element.In a preferred embodiment, the support element comprises a medium cellulose acetate tube.

[0060] The aerosol-cooling element may be located downstream of the aerosol-forming substrate, for example the aerosol-cooling element may be located immediately downstream of the support element, and may be located close to the support element. The aerosol-cooling element may also be located between the support element and the mouthpiece, the mouthpiece being located at the most downstream end of the aerosol-generating article.

[0061] The aerosol-cooling element may have a total surface area of ​​between about 300 square millimeters per millimeter of length and about 1000 square millimeters per millimeter of length. In a preferred embodiment, the aerosol-cooling element has a total surface area of ​​about 500 square millimeters per millimeter of length.

[0062] Preferably, the aerosol-cooling element has a low resistance to draw. That is, preferably, the aerosol-cooling element provides a low resistance to air passing through the aerosol-generating article. Preferably, the aerosol-cooling element does not substantially affect the resistance to draw of the aerosol-generating article.

[0063] The aerosol-cooling element may comprise a plurality of longitudinally extending channels. The plurality of longitudinally extending channels may be defined by a sheet material that has undergone one or more of curling, pleating, gathering and folding to form the channels. The plurality of longitudinally extending channels may be defined by a single sheet that has undergone one or more of curling, pleating, gathering and folding to form the plurality of channels. Alternatively, the plurality of longitudinally extending channels may be defined by a plurality of sheets that have undergone one or more of curling, pleating, gathering and folding to form the plurality of channels.

[0064] In some embodiments, the aerosol-cooling element may include a gathered sheet of material selected from the group consisting of: metal foil, polymeric material, and substantially non-porous paper or paperboard. In some embodiments, the aerosol-cooling element may include a gathered sheet of material selected from the group consisting of: polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polylactic acid (PLA), cellulose acetate (CA), and aluminum foil. In a preferred embodiment, the aerosol-cooling element includes a gathered sheet of biodegradable material. For example, a gathered sheet of non-porous paper or a gathered sheet of a biodegradable polymeric material (such as polylactic acid).

[0065] The aerosol-cooling element may be formed from a gathered sheet of material having a specific surface area between about 10 square millimeters per milligram and about 100 square millimeters per milligram by weight. In some embodiments, the aerosol-cooling element may be formed from a gathered sheet of material having a specific surface area between about 10 square millimeters per milligram and about 100 square millimeters per milligram by weight. 2 Aggregate sheets of materials with a specific surface area of ​​ / mg are formed.

[0066] The aerosol generating article may include a mouthpiece located at the mouth end of the aerosol generating article. The mouthpiece may be located immediately downstream of the aerosol cooling element and in close proximity to the aerosol cooling element. The mouthpiece may include a filter. The filter may be formed of one or more suitable filter materials. Many such filter materials are known in the art. In one embodiment, the mouthpiece may include a filter formed of cellulose acetate tow.

[0067] The elements of the aerosol-generating article (e.g., the aerosol-forming substrate and any other elements of the aerosol-generating article, such as the support element, the aerosol-cooling element and the mouthpiece) are surrounded by an outer wrapper. The outer wrapper is formed from any suitable material or combination of materials. Preferably, the outer wrapper is cigarette paper.

[0068] Smoking article, i.e. aerosol generating device, is used to describe a device that interacts with an aerosol-forming substrate of an aerosol generating article to generate an aerosol. Preferably, the aerosol generating device is a smoking device that interacts with an aerosol-generating substrate 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 can be a holder for a smoking article.

[0069] The heating method of the smoking device can utilize the principle of resistance heating, infrared heating and electromagnetic induction heating. Resistance heating mainly includes inner core heating, outer periphery heating and inner and outer mixed heating. Infrared heating mainly includes outer periphery heating, which is a better use scenario of the invention. Magnetic induction heating includes an induction coil and an electromagnetic induction heating substrate. The electromagnetic induction heating substrate is generally called a receptor, and the induction coil is generally called an inductor. The electromagnetic induction heating substrate as a part of the heater can be arranged on the aerosol generating device or in the aerosol generating product. The heater is preferably needle-shaped, strip-shaped, leaf-shaped or tubular.

[0070] In this patent, the aerosol generating device adopts electromagnetic induction heating.

[0071] The electromagnetic induction heating body is made of a material that can convert electromagnetic energy into heat. When located in a fluctuating electromagnetic field, eddy currents induced in the electromagnetic induction heating substrate cause heating of the electromagnetic induction heating substrate. When the elongated electromagnetic induction heating body is positioned in thermal contact with the aerosol-forming substrate, the aerosol-forming substrate is heated by the electromagnetic induction heating substrate.

[0072] The aerosol-generating article is designed to engage with an electrically operated aerosol-generating device that includes an induction heating source. The induction heating source or inductor generates a fluctuating electromagnetic field so as to heat a susceptor located within the fluctuating electromagnetic field. In use, the aerosol-generating article engages with the aerosol-generating device such that the susceptor is located within the fluctuating electromagnetic field generated by the inductor.

[0073] The length dimension of the susceptor is greater than its width dimension or its thickness dimension, for example greater than twice its width dimension or its thickness dimension. The susceptor may therefore be described as an elongated susceptor. The susceptor may be arranged substantially longitudinally within the aerosol generating substrate. This means that the length dimension of the elongated susceptor is arranged approximately parallel to the longitudinal direction of the aerosol generating substrate, for example within plus or minus 10 degrees parallel to the longitudinal direction of the aerosol generating substrate. In a preferred embodiment, the elongated susceptor may be located in a radially central portion within the aerosol generating substrate and extend along the longitudinal axis of the aerosol generating substrate.

[0074] The susceptor may be made of any material that can be heated by induction to a temperature sufficient to generate an aerosol from the aerosol-forming substrate. Preferred susceptors include metals or carbon. Preferred susceptors may include ferromagnetic materials, such as ferrite, ferromagnetic steel, or stainless steel. Suitable susceptors may be aluminum or may include aluminum. Preferred susceptors may be made of 400 series stainless steel, such as 410, 420, or 430 grade stainless steel. When placed in an electromagnetic field with similar frequency and field strength values, different materials will consume different amounts of energy. Therefore, the parameters of the susceptor, such as material type, length, width, and thickness, may be varied within a known electromagnetic field to provide the required energy consumption.

[0075] It is possible to heat the preferred susceptor to temperatures in excess of 250 degrees C. Suitable susceptors may include a non-metallic core having a metallic layer disposed on the non-metallic core, such as metal tracks formed on the surface of a ceramic core.

[0076] The susceptor may have an outer protective layer, such as a ceramic protective layer or a glass protective layer encapsulating the elongated susceptor to form a complete heating body. The susceptor may include a protective coating formed of glass, ceramic or inert metal formed on a core of susceptor material.

[0077] The susceptor is arranged in thermal contact with the aerosol-forming substrate. Therefore, when the susceptor is heated, the aerosol-forming substrate is heated and forms an aerosol. In one embodiment, a heating body including a susceptor is inserted into the aerosol-forming substrate, and the aerosol generating device may include a single or multiple elongated heating bodies. In another embodiment, the aerosol-generating substrate may include a susceptor, alternatively, the aerosol-generating substrate may include a plurality of susceptors.

[0078] The aerosol generating device can generate a fluctuating electromagnetic field between about 1 MHz and 30 MHz, such as between 2 MHz and 10 MHz, such as between 5 MHz and 7 MHz, through the induction coil of the induction transmitter. The induction coil material should be selected from materials with good conductive effects such as metals; in addition, in this patent, the induction coil material should also have good elastic deformation ability, and metals such as spring steel, gold, and silver can be used.

[0079] The aerosol generating device is a portable or handheld aerosol generating device that a user can hold comfortably between the fingers of a single hand. The aerosol generating device may be substantially cylindrical in shape. The aerosol generating device may have a length of between about 70 millimeters and about 120 millimeters.

[0080] The power source of the aerosol generating device may be any suitable power source, such as a DC voltage source, such as a battery. In one embodiment, the power source is a lithium ion battery. Alternatively, the power source may 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. The weight of the power source should be such that the weight of the smoking device as a whole can be comfortably held between the fingers of a single hand of the user.

[0081] The technical effects of the present invention are as follows:

[0082] (1) Without increasing the complexity and volume of the heated smoking device, the shape and arrangement of the heating components of the induction heating are designed to increase the heating area of ​​the aerosol generating product so that it is evenly and fully heated;

[0083] (2) Due to its electromagnetic heating method and the structure of the high contact area of ​​the inductor, the effective heating temperature required for the electromagnetic induction heating substrate is lower than that of the traditional inner core resistance heating smoking device, which improves the safety of the device and reduces power consumption;

[0084] (3) The size, shape and arrangement of the heating assembly are more conducive to the insertion of random tobacco sticks than the prior art;

[0085] (4) The close relative position of the first sheet-shaped induction heating body and the temperature sensor, as well as the configuration of the temperature sensor directly in the heating zone, ensures the independence and accuracy of the heating temperature monitoring;

[0086] (5) The first induction heating body, the second induction heating body and any other induction heating bodies of the inductor are integrally formed and connected to each other through a base connection portion, so the areas surrounded by the multiple heating bodies constitute an effective magnetic flux area, which can greatly increase the intensity of the induced potential compared to multiple independent heating bodies;

[0087] (6) The structure of the integrated induction heating body is manufactured by punching and bending, which greatly reduces the process complexity and production cost;

[0088] (7) The inductor is formed by cold working, which avoids the influence of high temperature processing on the magnetic permeability of materials such as stainless iron;

[0089] (8) The base and support provide a firm, stable and simple fixing structure for the temperature sensor and inductor;

[0090] In summary, the present invention provides an aerosol generating device which is easy to operate, low-cost, sensitive in temperature control, simple in structure, excellent in smoking effect and small in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] The above technical content of the present invention and the following specific embodiments will be better understood when read in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are only examples of the technical solutions claimed for protection. In the accompanying drawings, the same reference numerals represent the same or similar elements.

[0092] Figure 1 is a three-dimensional schematic diagram of an electromagnetic induction heating substrate (in an unfolded state) in one embodiment of the present invention;

[0093] Figure 2 is a three-dimensional schematic diagram of an electromagnetic induction heating substrate (in an unfolded state) containing a bending line in one embodiment of the present invention;

[0094] Figure 3-a is a three-dimensional schematic diagram of folding the first sheet-shaped induction heating body upward in one embodiment of the present invention;

[0095] Figure 3-b is a three-dimensional schematic diagram of folding the second sheet-shaped induction heating body upward in one embodiment of the present invention;

[0096] Figure 3-c is a three-dimensional schematic diagram of an embodiment of the present invention in which all sheet-shaped induction heating bodies are folded upward;

[0097] Figure 4 is a three-dimensional schematic diagram of a temperature sensor and an electromagnetic induction heating substrate in one embodiment of the present invention;

[0098] Figure 5 is a three-dimensional schematic diagram of an electromagnetic induction heating substrate coated with a temperature sensor in one embodiment of the present invention;

[0099] Figure 6 Schematic diagram of electromagnetic induction heating substrate and base in one embodiment of the present invention.

[0100] The reference numerals are described as follows:

[0101] 101 The first sheet induction heating element

[0102] 102, 103 second sheet-shaped induction heating body

[0103] 104 Reverse extension

[0104] 105 heating zones

[0105] 106 Spikes

[0106] 200 Center

[0107] 300 split wire duct

[0108] 400 Temperature Sensor

[0109] 401 high temperature resistant insulation coating

[0110] 402 temperature measurement circuit

[0111] 403 high temperature resistant insulation coating

[0112] 404 thin metal sheet

[0113] 405 Temperature measuring electrode

[0114] 500 base DETAILED DESCRIPTION

[0115] The detailed features and advantages of the present invention are described below in the specific implementation mode, and the content is sufficient to enable those skilled in the art to understand the technical content of the present invention and implement it accordingly. According to this specification, claims and drawings, those skilled in the art can easily understand the relevant objects and advantages of the present invention.

[0116] For ease of understanding, the directional terms such as "upper", "lower", "top" and "bottom" used in this specification are based on the upright state of the electromagnetic induction heating substrate.

[0117] Figure 1 An embodiment of an electromagnetic induction heating substrate is shown. In this embodiment, the electromagnetic induction heating substrate includes a first induction heating body 101, a second induction heating body 102, and a second induction heating body 103, which are distributed circumferentially. The first induction heating body 101, the second induction heating body 102, and the second induction heating body 103 are integrally connected through a central portion 200. An open cutting line groove 300 is provided in the central portion 200, and the cutting line of the cutting line groove 300 constitutes the outline of the reverse extension portion 104.

[0118] The manufacturing method of this embodiment includes: cutting the plate material into a planar unfolded shape of the electromagnetic induction heating substrate (such as Figure 1 As shown, preferably, the induction heating body material in the form of sheet metal is used to form a planar unfolded state of the electromagnetic induction heating substrate by laser, wire cutting, etc. The manufacturing method of this embodiment reduces the process complexity and production cost. The inductor formed by cold working avoids the influence of high temperature processing on the magnetic permeability of materials such as stainless iron.

[0119] FIG. 3a, FIG. 3b, and FIG. 3c show an embodiment of an electromagnetic induction heating substrate. In this embodiment, the electromagnetic induction heating substrate includes a first induction heating body 101, and second induction heating bodies 102 and 103, which are processed to the assembly position respectively, preferably by stamping or bending. The first sheet-like induction heating body 101 and the second sheet-like induction heating bodies 102 and 103 are folded in the same direction relative to the central portion 200 to be substantially perpendicular to the central portion 200. When the first sheet-like induction heating body 101 is folded relative to the central portion 200, the reverse extension portion 104 is folded in the reverse direction relative to the central portion 200. The sheet-like induction heating bodies are connected through the central portion 200, so the areas surrounded by the multiple heating bodies constitute an effective magnetic flux area, which can greatly increase the intensity of the induced potential compared to multiple independent heating bodies.

[0120] Optionally, the layout of the first induction heating body 101 and the second induction heating bodies 102 and 103 may be a central symmetrical array, an axisymmetric array or a triangular layout. In addition, the number of the first induction heating bodies may be multiple, and the number of the second induction heating bodies may be more than two.

[0121] Preferably, if Figure 2 As shown, the heating substrate includes the same number of bending lines N as the sheet-like induction heating bodies, and the bending lines N are located at the junctions of the first sheet-like induction heating body 101 and the second sheet-like induction heating bodies 102, 103 with the central portion 200 respectively. The first sheet-like induction heating body 101 and the second sheet-like induction heating body 102, 103 are folded relative to the central portion 200 along the bending lines N, and the portions of the first sheet-like induction heating body 101 and the second sheet-like induction heating body 102, 103 away from the central portion 200 relative to the bending lines N constitute a heating zone 105 for heating, and the reverse extension portion 104 is opposite to the heating zone 105 along the bending line N.

[0122] Figure 4 The figure shows an embodiment of an electromagnetic induction heating substrate. In this embodiment, a temperature sensor is coated on the surface of the first sheet-shaped electromagnetic induction heating body 101, and the temperature sensor 400 has a temperature measuring electrode 405, which is located on the reverse extension portion 104. The temperature sensor 400 can be composed of a high temperature resistant insulating coating 401, a temperature measuring circuit 402, a high temperature resistant insulating coating 403 and a thin metal sheet 404, which are sequentially coated on the first sheet-shaped induction heating body 101, and the temperature measuring circuit 402 extends from the heating area 105 to the reverse extension portion 104. The temperature sensor 400 has a temperature measuring electrode 405, which is located on the reverse extension portion 104. Through the above configuration, the temperature of the heating area 105 can be measured more directly and accurately, effectively reducing the measurement error.

[0123] As shown in Figure 3 Figure 4 As shown, the manufacturing method of this embodiment includes:

[0124] Prepare a metal sheet having a desired shape of an electromagnetic induction heating substrate, the metal sheet comprising a central portion 200 and three heating bodies 101, 102, 103 extending outward from the central portion;

[0125] An open dividing groove 300 is cut in the central portion 200 of the metal sheet, so that the dividing groove is open at the junction of the central portion and one of the heating bodies 101, and the connecting line M of the endpoints of the open portion is substantially 90 degrees to the extension direction of the heating body 101 from the central portion;

[0126] The heating body is bent so that it is bent substantially vertically relative to the central portion 200, and the reverse extension portion 104 defined by the dividing line groove 300 is bent substantially vertically relative to the central portion together with the first sheet-like induction heating body 101, so as to be kept in the same plane with the first sheet-like induction heating body 101;

[0127] The remaining two heating bodies 102 and 103 are bent so as to be substantially perpendicular to the central portion 200 in the same manner as the first heating body 101 .

[0128] In this way, the basic configuration of the electromagnetic induction heating substrate is completed.

[0129] Used to monitor the temperature of the heating component. The manufacturing method of this embodiment includes:

[0130] After the bending process, the high temperature resistant insulating coating 401, the temperature measuring circuit 402, the high temperature resistant insulating coating 403 and the thin metal sheet 404 are sequentially applied to the first sheet-shaped induction heating body 101, and the temperature measuring circuit is extended from the heating body 101 to the reverse extension portion 104. Preferably, the thin metal sheet 404 and the first sheet-shaped induction heating body 101 can be closely attached by vacuuming and isostatic pressing, and then they are sintered under reducing conditions. Advantageously, a protective glaze layer is coated on the outer surface of the heating body after the final sintering.

[0131] Preferably, after the sintering and coating process, the base 500 is circumferentially wrapped around and joined to the central portion 200, so that the base does not substantially cover the reverse extension portion 104 and the plurality of heating zones 105. In this way, the base 500 can provide support for the electromagnetic induction heating substrate, facilitate positioning and installation in the electromagnetic induction heating system, and at the same time do not affect the heating function and temperature measurement function of the induction heating substrate.

[0132] Figure 5An embodiment of an electromagnetic induction heating substrate is shown. In this embodiment, there are three sheet-like electromagnetic induction heating bodies 101, 102, 103, arranged in an equilateral triangle. A spike portion 106 is provided on the top of each sheet-like electromagnetic induction heating body, and the electromagnetic induction heating substrate is inserted into the aerosol generating product during use. Optionally, the tip angle of the spike portion 106 is less than 30°. All sheet-like electromagnetic induction heating bodies 101, 102, 103 are mounted on the base 500 to form a whole.

[0133] Figure 6 The figure shows an embodiment of the base 500. The base 500 is used to fix the electromagnetic induction heating substrate, and the base 500 does not cover the temperature measuring electrode 405 and the heating area 105. Preferably, the base 500 is made of a high temperature resistant material, for example:

[0134] (1)PEEK;

[0135] (2) Metals that are insensitive to magnetic induction, such as stainless steel;

[0136] (3) High temperature ceramics, such as zirconia, alumina, etc.

[0137] In summary, the present invention discloses an electromagnetic induction heating substrate which is convenient to operate, low-cost, sensitive in temperature control, simple in structure, excellent in smoke generation effect and small in size.

[0138] The terms and expressions used herein are for descriptive purposes only, and the present invention should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or parts thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

[0139] Similarly, it should be pointed out that although the present invention has been described with reference to the current specific embodiments, ordinary technicians in this technical field should realize that the above embodiments are only used to illustrate the present invention, and various equivalent changes or substitutions may be made without departing from the spirit of the present invention. Therefore, as long as the changes and modifications to the above embodiments are within the scope of the essential spirit of the present invention, they will fall within the scope of the claims of the present invention.

Claims

1. An electromagnetic induction heating substrate for electromagnetic induction heating of an aerosol generating device, comprising at least one first sheet-shaped induction heating body (101) and at least one second sheet-shaped induction heating body (102, 103), characterized in that: The first sheet-shaped induction heating body (101) and the second sheet-shaped induction heating body (102, 103) are integrally formed, circumferentially distributed, and connected to the central portion (200). The first sheet-shaped induction heating body (101) comprises a reverse extension portion (104), The second sheet-shaped induction heating body (102, 103) has a dividing line groove (300) near the central portion (200), the dividing line groove (300) is not closed near the central portion (200) of the first sheet-shaped induction heating body (101), and the dividing line groove (300) forms the outline of the reverse extension portion (104). The heating substrate further comprises bending lines (N) having the same number as the sheet-like induction heating bodies (101, 102, 103), wherein the bending lines (N) are located at the junction of the first sheet-like induction heating body (101) and the second sheet-like induction heating body (102, 103) with the central portion (200). The first sheet-like induction heating body (101) and the second sheet-like induction heating body (102, 103) are folded along the bending line (N) relative to the central portion (200) in the same direction to be substantially perpendicular to the central portion (200); when the first sheet-like induction heating body (101) is folded relative to the central portion (200), the reverse extension portion (104) is folded in the reverse direction relative to the central portion (200); the reverse extension portion (104) and the first sheet-like induction heating body (101) are maintained in the same plane.

2. The electromagnetic induction heating substrate according to claim 1, characterized in that: The first sheet-shaped induction heating body (101) and the second sheet-shaped induction heating body (102, 103) form a heating zone (105) for heating at a portion away from the central portion (200) relative to the bending line (N), and the reverse extension portion (104) is opposite to the heating zone (105) along the bending line (N).

3. The electromagnetic induction heating substrate according to claim 2, characterized in that: A temperature sensor (400) is covered on the surface of the electromagnetic induction heating substrate. The temperature sensor (400) is arranged on the first sheet-shaped induction heating body (101). The temperature sensor (400) has a temperature measuring electrode (405). The temperature measuring electrode (405) is located on the reverse extension portion (104).

4. The electromagnetic induction heating substrate according to claim 3, characterized in that: The temperature sensor (400) is composed of a high temperature resistant insulating coating (401), a temperature measuring circuit (402), a high temperature resistant insulating coating (403) and a thin metal sheet (404), and is sequentially coated on the first sheet-shaped induction heating body (101), and the temperature measuring circuit (402) extends from the heating area (105) to the reverse extension portion (104).

5. The electromagnetic induction heating substrate according to claim 4, characterized in that: The thin metal sheet (404) is subjected to vacuuming and isostatic pressing, closely adhered to the first sheet-shaped induction heating body (101) covered with the high-temperature resistant insulating coating (401), the temperature measuring circuit (402) and the high-temperature resistant insulating coating (403), and sintered under reducing conditions.

6. The electromagnetic induction heating substrate according to claim 5, characterized in that: The outer surface of the heated substrate after sintering is coated with a protective glaze layer.

7. The electromagnetic induction heating substrate according to claim 1, characterized in that: The line (M) connecting the endpoints of the unclosed portion of the dividing line groove (300) is at a 90° angle to the direction in which the first sheet-shaped induction heating body (101) extends from the central portion (200).

8. The electromagnetic induction heating substrate according to any one of claims 2 to 7, characterized in that: The invention also comprises a base (500), wherein the base (500) circumferentially surrounds and engages with the central portion (200), and the base (500) basically does not cover the reverse extension portion (104), the temperature measuring electrode (405) and the heating zone (105).

9. The electromagnetic induction heating substrate according to claim 8, characterized in that The base (500) is made of a material that is resistant to high temperatures and insensitive to magnetic induction.

10. An electromagnetic induction heating system, comprising the heating substrate according to any one of claims 2 to 9, and also comprising an electromagnetic induction coil, wherein the heating area (105) in the heating substrate is placed in a changing magnetic field generated by the electromagnetic induction coil for induction heating.

11. An aerosol generating device, comprising the induction heating system according to claim 10, further comprising a housing, a power supply and a control circuit.

12. A method for manufacturing the electromagnetic induction heating substrate according to claim 1, characterized in that: include: Prepare a metal sheet having a desired shape of the electromagnetic induction heating substrate, the metal sheet comprising a central portion (200) and a plurality of sheet-shaped induction heating bodies (101, 102, 103) extending outward from the central portion; An open dividing line groove (300) is cut within the central portion (200) of the metal sheet, so that the dividing line groove is open at a junction position close to the central portion and at least one of the first sheet-shaped induction heating bodies (101), and a line (M) connecting the end points of the open position is substantially 90 degrees to a direction in which at least one of the first sheet-shaped induction heating bodies (101) extends from the central portion (200); The at least one first sheet-shaped induction heating body (101) is subjected to a bending process so that it is bent substantially perpendicularly relative to the central portion, and the reverse extension portion (104) defined by the dividing line groove (300) is bent substantially perpendicularly relative to the central portion (200) together with the at least one first sheet-shaped induction heating body (101), so as to be maintained in the same plane as the at least one first sheet-shaped induction heating body (101); The remaining second sheet-shaped induction heating bodies (102, 103) are subjected to a bending process so as to be bent substantially vertically relative to the central portion in the same manner as the at least one first sheet-shaped induction heating body (101).

13. The method for manufacturing an electromagnetic induction heating substrate according to claim 12, characterized in that After the bending process, a high temperature resistant insulating coating (401), a temperature measuring circuit (402), a high temperature resistant insulating coating (403) and a thin metal sheet (404) are sequentially coated on the at least one first sheet-shaped induction heating body (101), and the temperature measuring circuit extends from the at least one heating body to the reverse extension portion (104).

14. The method for manufacturing an electromagnetic induction heating substrate according to claim 13, characterized in that The thin metal sheet (404) is closely fitted to the at least one first sheet-shaped induction heating body (101) coated with the high-temperature resistant insulating coating (401), the temperature measuring circuit (402) and the high-temperature resistant insulating coating (403) by vacuuming and isostatic pressing, and then sintered under reducing conditions.

15. The method for manufacturing an electromagnetic induction heating substrate according to claim 14, characterized in that , a protective glaze layer is coated on the outer surface of the heating body after sintering.

16. The method for manufacturing an electromagnetic induction heating substrate according to any one of claims 13 to 15, characterized in that Finally, the base (500) is wrapped around the circumference and joined to the central portion (200), so that the base (500) basically does not cover the temperature measuring electrode (405) and the multiple heating zones (105).

Images