• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    AEROSOL OPERATING DEVICE WITH IMPROVED TEMPERATURE DISTRIBUTION. The present invention relates to an aerosol generating device configured to receive an aerosol-forming substrate and configured to heat the aerosol-forming substrate using both an internal heater, positioned inside the substrate, and an external heater positioned outside the substrate. The use of both internal and external heaters allows each heater to operate at a lower temperature than would be required when using either the internal heater or the external heater individually. By operating the external heater at a lower temperature than the internal heater, the substrate can be heated to have a relatively uniform temperature distribution, while the external temperature of the device can be maintained at an acceptably low level.
    公开号:BR112014012258B1
    申请号:R112014012258-0
    申请日:2012-12-28
    公开日:2021-01-12
    发明作者:Julien Plojoux；Olivier Greim
    申请人:Philip Morris Products S.A.；
    IPC主号:
    专利说明:

    [0001] [001] This report refers to an aerosol generating device and in particular, a heating arrangement and method for heating an aerosol forming substrate within an aerosol generating device.
    [0002] [002] Aerosol generating devices in which an aerosol-forming substrate is heated to produce an aerosol are known in the art. For a given aerosol-forming substrate, there is an acceptable temperature range in which it can be heated. It is important not to exceed a maximum temperature, above which undesirable combustion or pyrolysis can occur. However, below a minimum temperature, the desired aerosol will not be formed. The substrate can be heated using heaters positioned outside the substrate or inside the substrate. Using an internal heater has the advantage that heat is efficiently provided to the substrate with less heat loss than with external heaters. However, an issue with the use of an internal heater is that it is difficult to provide heat evenly throughout the substrate and thus heat the entire substrate within an optimal temperature range.
    [0003] [003] It is desirable to heat an aerosol-forming substrate to have a uniform temperature distribution or at least so that the entire substrate has a temperature within a desirable temperature range.
    [0004] [004] The present invention relates to an aerosol generating device configured to receive an aerosol-forming substrate and configured to heat the aerosol-forming substrate using both an internal heater, positioned inside the substrate and an external heater positioned outside the substrate . The use of both internal and external heaters allows each heater to operate at a lower temperature than would be required when using only the internal heater or the external heater. By operating the external heater at a lower temperature than the internal heater, the substrate can be heated to have a relatively uniform temperature distribution while an external temperature of the device can be maintained at an acceptable low level. This is a significant emission for hand held devices, since, for example, if higher temperatures are required for heaters, dangerous or uncomfortable hot spots can arise during the operation of an aerosol generating device.
    [0005] [005] In one embodiment, an aerosol generating device is provided comprising: a substrate-receiving cavity configured to receive an aerosol-forming substrate, an internal heater positioned within the substrate-receiving cavity; an external heater positioned on a perimeter of the substrate receiving cavity; and a controller configured to control a power source for the internal heater or external heater or both, so that the external heater has a lower temperature than the internal heater. In use, the external heater may have a temperature lower than the temperature of the aerosol-forming substrate, but higher than the ambient temperature.
    [0006] [006] As used here, "an aerosol generating device" refers to a device that intersects with an aerosol-forming substrate to generate an aerosol. The aerosol-forming substrate may be part of an aerosol-generating article, for example, part of the smoke article. An aerosol generating device may be a bore device that interacts with an aerosol-forming substrate of an aerosol-generating article to generate an aerosol that is directly aspirable into a user's lung through the user's mouth. An aerosol generating device can be a carrier.
    [0007] [007] As used here, the term "aerosol-forming substrate" refers to a substrate capable of releasing volatile compounds that can form an aerosol. Such volatile compounds can be released by heating the aerosol-forming substrate. An aerosol-forming substrate may conveniently be part of an aerosol-generating article or smoke article.
    [0008] [008] As used here, the terms "aerosol generating article" and "smoke article" refer to an article comprising an aerosol-forming substrate that is capable of releasing volatile compounds that can form an aerosol. For example, an aerosol-generating article may be a smoking article that generates an aerosol that is directly aspirable into the user's lungs through the user's mouth. An aerosol-generating article may be disposable. The term "smoking article" is generally used later. A smoking article can be or can comprise a cigarette stick.
    [0009] [009] The external heater can be configured or controlled to provide, in conjunction with the internal heater, a substantially uniform temperature distribution around a perimeter of the cavity. The substantially uniform temperature distribution can be determined by several known methods, for example, the use of an infrared camera to copy profiles or thermocouples. Other methods of determining the temperature distribution will be made apparent to those skilled in the art. The most advantageous format for the external heater depends on the shape of the internal heater as well as the shape of the aerosol-forming substrate. For example, the external heater can be configured and positioned adjacent those portions of the over-spreading aerosol-forming substrate or which receive less heat from the internal heater.
    [0010] [0010] The external heater can advantageously be arranged substantially symmetrically around a perimeter of the substrate receiving cavity, particularly when the internal heater is arranged symmetrically or centrally within the substrate receiving cavity. The external heater may comprise one or more elements of the external heater. The term "external heater element" refers to that which at least partially surrounds the aerosol-forming substrate.
    [0011] [0011] The internal heater may comprise an internal heater element in the form of a fin, to at least partially insert into the aerosol forming substrate of the smoke article when the smoke article is received in the cavity. An “internal heater element” is one that is suitable for insertion into an aerosol-forming material.
    [0012] [0012] The external heater may comprise two heating elements each extending partially around the perimeter of the cavity and positioned to face the larger faces of a heating fin.
    [0013] [0013] The controller can take the form of an electronic circuit arranged to be connected to a power source and to one or both internal heater and external heater. The electronic circuit can prepare for the internal and external heaters to be independently controllable or to separate the elements from the heaters, forming part of the internal heater or part of the external heater, to be independently controllable. The electronic circuit can be programmable.
    [0014] [0014] The controller can be configured to control the external heater to have a temperature between 100 and 200 ° C. The controller can be configured to control the internal heater to have a temperature between 320 and 420 ° C. In one embodiment, the controller will be configured such that the internal heater has an average temperature over the surface area of the internal heater of approximately 375 ° C and a maximum localized temperature of 420 ° C.
    [0015] [0015] The aerosol generating device may further comprise a housing containing internal and external heaters. The housing can be designed to be held or held by a user.
    [0016] [0016] The external heater can be spaced from the enclosure by a gap of air or an insulating layer. In particular, a support structure can be provided around the external heater, the support structure comprising an internal surface having one or more flutes or projections, flutes or projections contacting the external heater. The support structure can be received within the enclosure or form part of the enclosure. Because it supports the external heater in the flutes or projections, the thermal conduction from the external heater to the support structure and to the enclosure is relatively small. The external heater may be positioned on or form an internal surface of the cavity, so that, in use, the external heater contacts the aerosol-forming substrate or an outer wrap or envelope of the aerosol-forming substrate. The external heater can then heat the aerosol-forming substrate directly by conduction. It will now be apparent to those skilled in the art that although reference is made to a cavity for receiving an aerosol-forming substrate, the aerosol-forming substrate may be an element comprising a smoke article comprising a rod including the substrate-forming substrate aerosol as well as other elements such as filters and transfer portions. It will therefore also be made obvious to those skilled in the art that the external heater can be provided in the housing in such a way as to allow heating of the substrate by modifying the housing, design of the external heater and the smoke article. The support structure may comprise a mesh or comprise a plurality of holes in order to provide a low thermal mass.
    [0017] [0017] The external heater can be provided in a sleeve that is movable relative to the housing of the device. The aerosol forming substrate can be received in the glove. The glove can be used to assist the insertion and extraction of the aerosol-forming substrate into and from the device. The glove may comprise a sliding receptacle for receiving the substrate, the sliding receptacle being slidable between a first position and a second position. The first position of the sliding receptacle is an operating position in which the internal and external heaters can heat the aerosol-forming substrate to form the aerosol. The glove asks to include the electrical contacts for connecting the external heater to a power source on the device when the glove is in the first position.
    [0018] [0018] The aerosol generating device may further comprise an air inlet. The aerosol generating device may further comprise an air outlet. The aerosol generating device may further comprise a condensation chamber to allow the aerosol to have the desired characteristics to form.
    [0019] [0019] The aerosol generating device may be an electrically heated smoke system and may comprise electric internal and external heaters.
    [0020] [0020] The elements of the electric heater may comprise electrically resistive material. Suitable electrically resistive materials include, but are not limited to: semiconductors such as inducted ceramics, electrically "conductive" ceramics (such as, for example, molybdenum disilicate), carbon, graphite, metals, metal alloys and composite materials made of a ceramic material and a metallic material. Such composite materials can comprise induced or non-inducible ceramics. Examples of suitable inducted ceramics include induced silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum and metals from the platinum group series. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminum-titanium-zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese -, gold-, and alloys containing iron and super alloys based on nickel, iron, cobalt, stainless steel. Timetal® and ferro-manganese-aluminum alloys. In composite materials, the electrically resistive material can optionally be embedded in, encapsulated or coated with an insulating material or vice versa, depending on the energy transfer kinetics and the required external physicochemical properties. Alternatively, electric heaters may comprise one or more infrared heating elements, photonic sources or inductive heating elements.
    [0021] [0021] The internal heater can take any appropriate shape. For example, the internal heater can take the form of a heating fin. Alternatively, the internal heater can take the form of an enclosure or substrate having different electrically conductive portions or an electrically resistive metal tube. Alternatively, the internal heater can be one or more hands or heating rods that run through the center of the aerosol-forming substrate. Other alternatives include a heating wire or filament, for example, a Ni-Cr (Nickel-Chromium), platinum, gold, silver, tungsten or alloy wire or a heating plate. Optionally, the internal heater element can be deposited on or on a rigid vehicle material. In such an embodiment, the electrically resistive heater can be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal can be formed as a rail in an appropriate insulating material such as ceramic material and then sandwiched in another insulating material such as glass. The heaters formed in this way can be used for both heating and monitoring the temperature of the heaters during operation.
    [0022] [0022] The external heater can take any appropriate shape. For example, the external heater can take the form of one or more flexible heating sheets on a dielectric substrate such as polyimide. The flexible heating sheets can be configured to conform to the perimeter of the substrate receiving cavity. Alternatively, the external heater can take the form of a metal grid or grids, a flexible printed circuit board, a molded interconnect device (MID), ceramic heater, flexible carbon fiber heater or can be formed using a coating technique such as plasma vapor deposition on an appropriately shaped substrate. The external heater can also be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal can be formed as a rail between the two layers of appropriate insulating materials. An external heater formed in this way can be used for both the heat and temperature monitor of the external heater during operation. The external heater can be an inductive heater.
    [0023] [0023] The internal or external heater comprises a heat source, or heat reservoir comprising a material capable of absorbing and storing heat and subsequently releasing heat over time to the aerosol-forming substrate. The heat source can be formed from any suitable material such as a suitable metal or ceramic material. In one embodiment, the material has a high heat capacity (sensitive heat storage material) or is a material capable of absorbing and subsequently releasing heat via a reversible process, such as a high temperature phase change. Suitable heat sensitive storage materials include silica gel, alumina, carbon, glass mat, fiberglass, minerals, a metal or alloy such as aluminum, silver or lead and a cellulose material such as paper. Other suitable materials that release heat via a reversible phase change include paraffin, sodium acetate, naphthalene, wax, polyethylene oxide, a metal, metal salt, a mixture of eutectic salts and an alloy. The heat source or heat reservoir can be arranged in such a way that it is directly in contact with the aerosol-forming substrate and can transfer the stored heat directly to the substrate. Alternatively, the heat stored in the heat source or heat reservoir can be transferred to the aerosol-forming substrate by means of a heat conductor such as a metal tube.
    [0024] [0024] The internal and external heaters advantageously heat the aerosol-forming substrate by means of conduction. The heaters may be at least partially in contact with the substrate or the vehicle on which the substrate is deposited. Alternatively, the heat from the internal or external heater can be conducted to the substrate by means of a conductive heat element.
    [0025] [0025] During operation, the aerosol-forming substrate can be completely contained within the aerosol generating device. In that case, a user can puff on a mouthpiece of the aerosol generating device. A mouthpiece can be any portion of the aerosol generating device that is placed in a user's mouth in order to directly aspirate an aerosol generated by the aerosol generating article or aerosol generating device. The aerosol is transported to the user's mouth via the mouthpiece. Alternatively, during operation, a smoke article containing the aerosol-forming substrate may be partially contained within the aerosol generating device. In that case, the user can puff directly on the smoking article or a mouth piece of the smoking article.
    [0026] [0026] The smoking article can be substantially cylindrical in shape. The smoking article can be substantially elongated. The smoking article can have an extension and a circumference substantially perpendicular to the extension. The aerosol-forming substrate may be in a substantially cylindrical shape. The aerosol-forming substrate can be substantially cylinder shaped. The aerosol-forming substrate can be substantially elongated. The aerosol-forming substrate may also have an extension and circumference substantially perpendicular to the extension.
    [0027] [0027] The smoking article can have a total length between approximately 30mm and approximately 100mm. The smoking article can have an external diameter between approximately 5mm and approximately 12mm. The smoking article may comprise a filter plug. The filter plug can be located at the downstream end of the smoke article. The filter plug can be a cellulose acetate filter plug. The filter plug is approximately 7 mm in length in one embodiment, however it can range from approximately 5mm to approximately 10mm.
    [0028] [0028] In one embodiment, the smoking article has a total length of approximately 45mm. The smoke article can have an outside diameter of approximately 7.2mm. In addition, the aerosol-forming substrate has an extension of approximately 10mm. Alternatively, the aerosol-forming substrate can be approximately 12mm in length. In addition, the diameter of the aerosol-forming substrate can be between approximately 5mm and approximately 12mm. The smoking article may comprise an outer paper wrapper. In addition, the smoke article may comprise a separation between the aerosol-forming substrate and the filter plug. The separation can be approximately 18mm, but it can be in the range of approximately 5mm to approximately 25mm.
    [0029] [0029] The aerosol forming substrate can be a solid aerosol forming substrate. Alternatively, the aerosol-forming substrate may comprise solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material that contains volatile tobacco aromatics that are released from the substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol forming substrate may further comprise an aerosol former. Examples of suitable aerosol builders are glycerin and propylene glycol.
    [0030] [0030] If the aerosol-forming substrate is a solid, the aerosol-forming substrate may comprise, for example, one or more of: powder, granules, pellets, fragments, spaghetti, strips or leaves containing one or more of: grass, tobacco leaf, fragments of tobacco veins, reconstituted tobacco, homogenized tobacco, extruded tobacco and expanded tobacco. The solid aerosol-forming substrate may be in the loose form or may be provided in an appropriate container or cartridge. Optionally, the aerosol-forming substrate may contain additional tobacco or non-tobacco volatile aromatic compounds, to be released upon heating the substrate. The aerosol-forming substrate may also contain capsules which, for example, include additional tobacco or non-tobacco volatile aromatics and such capsules may melt during heating of the aerosol-forming substrate.
    [0031] [0031] As used here, homogenized tobacco refers to the material formed by the agglomeration of particulate tobacco. Homogenized tobacco can be in the form of a leaf. The homogenized tobacco material can have an aerosol-forming content greater than 5% on the basis of dry weight. The homogenized tobacco material may alternatively have an aerosol-forming content of between 5% and 30% by weight on the basis of dry weight. The sheets of homogenized tobacco material can be formed by agglomerating particulate tobacco obtained by grinding or otherwise spraying one or both of the tobacco leaf blade and tobacco leaf stems. Alternatively or in addition, the sheets of homogenized tobacco material comprise one or more of tobacco powder, tobacco fines and other by-products of particulate tobacco formed during, for example, the treatment, handling and shipping of tobacco. The sheets of homogenized tobacco material may comprise one or more intrinsic binders, which are endogenous tobacco binders, one or more intrinsic binders, which are exogenous tobacco binders, or a combination thereof to aid in the agglomeration of particulate tobacco; alternatively or in addition, the leaves of the homogenized tobacco material may comprise other additives including, but not limited to, tobacco and non-tobacco fibers, aerosol builders, humectants, plasticizers, flavorings, fillers, aqueous and non-aqueous solvents and their combinations.
    [0032] [0032] In a particularly preferred embodiment, the aerosol forming substrate comprises a crimped sheet assembled from homogenized tobacco material. As used herein, the term "crimped sheet" indicates a sheet having a plurality of substantially parallel protrusions or ridges. Preferably, when the aerosol generating article is assembled, the substantially parallel protrusions or corrugations extend along or parallel to the longitudinal axis of the aerosol generating article. This advantageously facilitates the assembly of the curled sheet of the homogenized tobacco material to form the aerosol forming substrate. However, it will be appreciated that the curled sheets of homogenized tobacco material for inclusion in the aerosol-generating article may alternatively or in addition have a plurality of parallel ridges or corrugations such that they are arranged at an acute or obtuse angle on the longitudinal axis of the generating article aerosol when it has been assembled. In certain embodiments, the aerosol-forming substrate may comprise an assembled sheet of homogenized tobacco material that is substantially uniformly textured across its entire surface. For example, the aerosol-forming substrate may comprise a crimped sheet assembled of homogenized tobacco material comprising a plurality of substantially parallel protrusions or corrugations that are substantially equally spaced across the width of the sheet.
    [0033] [0033] Optionally, the solid aerosol forming substrate can be provided in or embedded in a thermally stable vehicle. The vehicle can take the form of powder, granules, pellets, fragments, spaghetti, strips or leaves. Alternatively, the vehicle can be a tubular vehicle having a thin layer of the solid substrate deposited on its inner or outer surface or on both its inner and outer surfaces. Such a tubular vehicle can be formed from, for example, a paper or paper-like material, a nonwoven carbon fiber mat, a low-mass open mesh wire mesh or a perforated metal sheet or any other thermally stable polymer matrix .
    [0034] [0034] The solid aerosol-forming substrate can be deposited on the vehicle surface in the form of, for example, a sheet, foam, gel or slurry. The aerosol-forming substrate can be deposited on the entire surface of the vehicle or alternatively, it can be deposited in a pattern in order to provide a non-uniform aroma delivery during use.
    [0035] [0035] Although reference is made to the solid aerosol forming substrates above, it will be apparent to those skilled in the art that other forms of aerosol forming substrate can be used with other embodiments. For example, the aerosol-forming substrate may be a liquid aerosol-forming substrate. If a liquid aerosol forming substrate were provided, the aerosol generating device preferably comprises means for retaining the liquid. For example, the liquid aerosol-forming substrate can be retained in a container. Alternatively or in addition, the liquid aerosol-forming substrate can be absorbed into a porous carrier material. The porous carrier material can be made of any suitable plug or absorbent body, for example, a foamed metal or plastic material, polypropylene, terylene, nylon or ceramic fibers. The liquid aerosol-forming substrate may be retained in the porous vehicle material prior to use of the aerosol-generating device or alternatively, the material of the aerosol-forming substrate may be released into the porous vehicle material during or immediately before use. For example, the liquid aerosol-forming substrate can be provided in a capsule. The capsule wrap preferably melts on heating and releases the liquid aerosol-forming substrate into the porous carrier material. The capsule can optionally contain a solid in combination with the liquid.
    [0036] [0036] Alternatively, the vehicle may be a nonwoven fabric or bundle of fiber in which the tobacco components have been incorporated. The nonwoven fabric or fiber bundle may comprise, for example, carbon fibers, natural cellulose fibers or cellulose derivative fibers.
    [0037] [0037] The aerosol generating device may also comprise a power source for supplying power to the internal and external heaters. The power source can be any suitable power source, for example, a DC voltage source. 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-polymer battery.
    [0038] [0038] In one embodiment, the aerosol generating device still comprises a sensor to detect the air flow indicative of a user giving a puff that enables the activation of the puff base of the electric heater for an improved energy management of the electric heater. The sensor can be any of: mechanical device, an electromechanical device, an optical device, an opto-mechanical device and a sensor based on the electromechanical microsystem (MEMS). In that embodiment, the sensor can be connected to the power source and the system is willing to activate the electric heater when the sensor detects a user taking a puff. In an alternative embodiment, the system also comprises a manually operable key, for a user to start a puff or enable the long-term smoking experience.
    [0039] [0039] The aerosol generating device is preferably a hand holding aerosol generating device, which is comfortable for a user to hold between the fingers of a single hand. The aerosol generating device can be substantially cylindrical in shape. The aerosol generating device may have a polygonal cross section and a projecting button formed on one face; in this embodiment, the outside diameter of the aerosol generating device can be between about 12.7mm and about 13.65mm measured from a flat face to an opposite flat face; between about 13.4 mm and about 14.2 mm measured from one edge to an opposite edge (that is, from the intersection of two faces on one side of the aerosol generating device to a corresponding intersection on the other side); and between about 14.2mm and about 15mm measured from a top of the button to a flat face of the button that opposes. The length of the aerosol generating device can be between about 70mm and 120mm.
    [0040] [0040] In another aspect, a method of heating an aerosol-forming substrate is provided comprising: providing a first heater in an internal region of the aerosol-forming substrate; provision of a second heater on or near the external surface of the substrate; and controlling the temperature of the first heater and the second heater on or near the outer surface of the substrate; and controlling the temperature of the first heater and second heater, so that the second heater is at a lower temperature than the first heater.
    [0041] [0041] The external heater can be controlled to have a temperature between 125 and 175 ° C. The internal heater can be controlled to have a temperature between 200 and 450 ° C. In use, the external heater may have a lower temperature than the aerosol-forming substrate but higher than the ambient temperature.
    [0042] [0042] The report will still be described, by way of example only, with reference to the attached drawings, in which:
    [0043] [0043] Figure 1 is a schematic drawing showing the basic elements of an aerosol generating device according to an embodiment,
    [0044] [0044] Figure 2 is a schematic longitudinal cross section of a heater arrangement according to an embodiment;
    [0045] [0045] Figure 3a shows the element of the internal heater of figure 2;
    [0046] [0046] Figure 3b shows the elements of the internal and external heater of figure 2;
    [0047] [0047] Figure 3c shows an arrangement of figure 3b with a support structure included;
    [0048] [0048] Figure 4 shows a substrate extractor for use in a device of the type shown in figure 1;
    [0049] [0049] Figure 5 is a schematic radial cross section of the arrangement in Figure 2 with an extractor as shown in Figure 4 inserted; and
    [0050] [0050] Figure 6 is a schematic longitudinal section of a heater arrangement in which the external heater elements are parts of a substrate extractor, according to another embodiment.
    [0051] [0051] In figure 1, the interior of an embodiment of an electrically heated aerosol generating system 100 is shown in a simplified manner. In particular, the elements of the electrically heated aerosol generating system 100 are not removed for scale in figure 1. Elements that are not relevant to the understanding of this embodiment have been omitted to simplify figure 1.
    [0052] [0052] The electrically heated aerosol generating system 100 comprises a housing 10 and an aerosol-forming substrate 2, for example, a cigarette. The aerosol-forming substrate 2 is pushed into the housing 10 to enter the thermal proximity to the heater 20. The aerosol-forming substrate 2 will release a range of volatile compounds at different temperatures. Some of the volatile compounds released from the aerosol-forming substrate 2 are only formed through the heating process. Each volatile compound will be released above a characteristic release temperature. By controlling the maximum operating temperature of the electrically heated aerosol operator system 100 to be below the release temperature of some of the volatile compounds, the release or formation of these smoke constituents can be prevented.
    [0053] [0053] Additionally, the housing comprises an electrical power source 40, for example, a rechargeable lithium ion battery. A controller 30 is connected to heater 20, the electrical power source 40, an aerosol forming substrate detector 32 and a graphical user interface 36, for example, a display. Controller 30 controls the power supplied to the heater 20 in order to regulate its temperature. Typically, the aerosol-forming substrate is heated to a temperature of between 250 and 450 ° C.
    [0054] [0054] The aerosol-forming substrate detector 32 can detect the presence and identify an aerosol-forming substrate 2 in thermal proximity to the heater 20 and signals the presence of an aerosol-forming substrate 2 to the controller 30.
    [0055] [0055] Controller 30 controls user interface 36 to display system information, for example, battery strength, temperature, status of aerosol-forming substrate 2, other messages or their combinations.
    [0056] [0056] Figure 2 is a schematic sectional view of the heater arrangement according to an embodiment. Figure 2 shows only a front portion of the device, in which the substrate is inserted. The housing is finished open and defines a substrate receiving cavity in which an aerosol-forming substrate 2 (shown in dotted line) can be inserted. The cavity is configured to receive a cylindrical substrate in the form of a smoke article in which a user puffs.
    [0057] [0057] The heater comprises three separate heater elements, an internal heater element 22 and two external heater elements 24, 26. The internal heater 22 is in the form of a fin supported on a base 21 and is shown more clearly in the figure 3a. The internal heater element 22 is configured to be received within the substrate. The external heater elements 24 and 26, shown more clearly in figure 3b, are arranged close to or in contact with the outer surface of the smoke article. External heater elements 24, 26 have an arcuate cross section and extend around the perimeter of the cavity.
    [0058] [0058] The external heaters are mounted within a support structure 50 within the housing 10. The support structure is more clearly shown in figure 3c and comprises a cylindrical casing 52 having a plurality of holes 54 formed therein. The external heater elements 24 and 26 are supported in an internal spiral flute structure 56 in the wrap to minimize conductive losses from the heater elements 24, 26 to the support structure 50 and housing 10. A cover structure 58 is provided to hold the heaters in place.
    [0059] [0059] Figure 3a shows the internal heater element 22 on the support base 21. The internal heater is in the form of a fin formed of ceramic material on which the platinum tracks are deposited. The heater is activated by passing a voltage across the platinum tracks. The fin is configured for easy insertion and removal of an aerosol-forming substrate 2.
    [0060] [0060] Figure 3b is a perspective view of the internal heater element 22 of figure 3a, with the elements of the external heater 24, 26 positioned around it and a portion of the base 21. As shown in figure 3b, the elements of external heater are formed from the curved or arched leaves that extend around the perimeter of the substrate receiving cavity. The elements of the external heater are formed from the flexible polyimide sheets between which the resistive heating rails are formed. Flexible heaters of this type are available from Minco at 7300 Commerce Lane, Minneapolis, MN 55432, U.S.A.
    [0061] [0061] The external heater elements shown in figure 3b do not extend around the entire perimeter of the cavity, but are positioned to fit the shape of the internal heater element 22. The external heater elements are positioned and configured to cover the regions the perimeter of the cavity very far from the internal heater element in order to provide a uniform temperature distribution within the cavity as much as possible. However, this can also be achieved by providing one or more elements of the external heater around the entire perimeter of the cavity and controlling the force supplied to the different sections of the elements of the external heater to obtain the most uniform temperature distribution possible. It is, of course, also possible to use a differently configured element or elements of the internal heater.
    [0062] [0062] The electrical connection of the internal and external heater elements to a power source is not shown for clarity. However, it should be clear that the elements of both the internal heater and the external heater are electrically connected to controller 30 and battery 40.
    [0063] [0063] Figure 3c shows the arrangement of the heater of figure 3b with the support structure 50 positioned around the elements of the external heater 24, 26. The support structure comprises a cylindrical casing 52 formed of such a thermoplastic PEEK or other material appropriate temperature resistant. The holes 54 are formed through the wrap in order to reduce its mass and, in particular, its thermal mass. As described, the casing 52 has a standard internal surface, in this example, an internal spiral flute, which supports the elements of the external heater while minimizing thermal contact. This cannot be seen in figure 3c. The casing 52 fits over the base 21. A cover 58, also formed of a heat-resistant material, such as plastic or ceramic, is fitted on the top of the housing and on the elements of the external heater 24, 26 to complete the structure of Support. In general, any material that has a sufficiently high melting / degradation temperature that prevents the release of undesirable volatile compounds can be used.
    [0064] [0064] In use, the internal heater element 22 is controlled to have a higher temperature than the external heater elements. In this embodiment, the internal heater element is controlled to have a maximum temperature of 350 ° C and during use is kept close to that maximum temperature. The elements of the external heater 24, 26 are controlled to have a maximum temperature of 150 ° C and in use, they are kept close to that maximum temperature.
    [0065] [0065] External heaters 24, 26 provide a form of active insulation. In other words, they reduce the thermal gradient through the heated substrate. In use, the aerosol-forming substrate typically reaches a much higher temperature than the elements of the external heater, however by reducing the thermal gradient through the substrate, a more uniform heating of the substrate can be achieved and a lower temperature for the element of the internal heater can be used.
    [0066] [0066] Figure 4 shows an extractor glove 60 that can be used in a device of the type shown in figures 1 and 2. The extractor glove assists in the insertion and extraction of the aerosol-forming substrate a and the device. The extractor sleeve is hollow and retains a cylindrical aerosol-forming substrate. The extractor sleeve is open at both ends, to allow both the insertion of the substrate into the sleeve from one end of the top and the insertion of the internal heater 22 into the substrate from one end of the bottom. A rim 61 can be formed at the bottom end of the extractor sleeve 60 to retain the substrate during an extraction process. The extractor sleeve is configured to be inserted into the substrate receiving cavity in the direction of arrow 66.
    [0067] [0067] The aerosol-forming substrate is positioned in the region of legs 62 and windows 64 in the extractor. Windows 64 are configured to correspond to external heaters 24, 26. Windows 64 can simply be openings in the extractor sleeve or they can be formed of a thermally conductive material such as aluminum.
    [0068] [0068] Figure 5 is a schematic radial cross section of a device of the type shown in figure 2 with the extractor sleeve inserted. The legs 62 of the extractor sleeve are shown positioned in the spaces between the external heater elements 24, 26. It can be seen that the support sleeve 52 for the external heater elements has cut portions for receiving the legs of the extractor sleeve. This allows the elements of the external heater to contact or be positioned very close to the aerosol forming substrate in use.
    [0069] [0069] In another embodiment, the external heater can be formed as part of an extractor sleeve of the type shown in figure 4. This is illustrated schematically in figure 6. Figure 6 shows the housing 70 of an aerosol generating device defining a cavity into which an aerosol-forming substrate can be inserted. Inside the cavity there is an internal heater 72, in the form of a fin as shown in figure 3a, supported on a base 71. An extractor sleeve 73 is inserted into the cavity. The extractor sleeve is substantially a hollow, tubular structure with a retaining lip 77 formed at one end. The extractor sleeve holds a cylindrical aerosol-forming substrate (not shown) and can be slid in and out of the cavity. The rim 77 retains the cylindrical aerosol-forming substrate when the sleeve 73 is removed from the cavity.
    [0070] [0070] The internal heater element 74 is formed on a lower surface of the sleeve 73 and extends around the circumference of the sleeve. The elements of the internal heater are electrically resistive rails formed in the extractor sleeve and can be made of platinum. In order to provide an electrical force to the external heater element 74, electrical contacts 75 are provided, which provide an electrical connection between the resistive rails on the inner surface of the sleeve 73 and a contact area on the outer surface of the sleeve 73. The contacts 75 contact housing 76 contacts, when sleeve 73 is in the fully inserted position. The contacts in the housing 76 are electrically connected to a controller and a battery within the aerosol generating device, as described with reference to figure 1.
    [0071] [0071] As described with reference to the previous embodiment, the external heater can be formed from one or a plurality of separate heater elements and can be configured or controlled to match the shape of the internal heater element or elements.
    [0072] [0072] The exemplary embodiments described above illustrate, but are not limiting. In view of the exemplary embodiments discussed above, other embodiments consistent with the exemplary embodiments above will now be made apparent to those ordinarily skilled in the art.
    权利要求:
    Claims (15)
    [0001]
    Aerosol generating device, comprising: a substrate receiving cavity configured to receive an aerosol forming substrate (2); an internal heater (22) positioned inside the substrate receiving cavity; an external heater (24, 26) positioned at a perimeter of the substrate receiving cavity; and a controller (30), characterized by the fact that the controller (30) is configured to control a power supply to the internal heater or the external heater or both, internal heater and external heater, so that the external heater has a temperature lower than the internal heater.
    [0002]
    Aerosol generating device according to claim 1, characterized in that the external heater (24, 26) is configured or controlled to provide, in conjunction with the internal heater (22), a substantially uniform temperature distribution around a perimeter of the cavity.
    [0003]
    Aerosol generating device according to claim 1 or 2, characterized in that the controller (30) is configured to control the external heater (24, 26) to have a temperature between 100 and 200 ° C.
    [0004]
    Aerosol generating device according to claim 1 or 2, characterized in that the controller (30) is configured to control the internal heater (22) to have a temperature between 320 and 420 ° C.
    [0005]
    Aerosol generating device according to any one of the preceding claims, characterized in that the external heater (24, 26) is arranged substantially symmetrically around a perimeter of the substrate receiving cavity.
    [0006]
    Aerosol generating device according to any one of the preceding claims, characterized in that the external heater (24, 26) comprises a plurality of elements of the external heater.
    [0007]
    Aerosol generating device according to claim 6, characterized in that the external heater (24, 26) comprises two heater elements each extending partially around the perimeter of the cavity.
    [0008]
    Aerosol generating device according to any one of the preceding claims, characterized in that it is configured such that, in use, the external heater (24, 26) has a lower temperature than the aerosol-forming substrate (2), but higher than at room temperature.
    [0009]
    Aerosol generating device according to any one of the preceding claims, characterized in that it also comprises a support structure (50) around the external heater (24, 26), the support structure comprising an internal surface having one or more flutes (56) or projections, flutes or projections contacting the external heater (24, 26).
    [0010]
    Aerosol generating device according to any one of the preceding claims, characterized in that the external heater (24, 26) is positioned on or forms an internal surface of the cavity so that, in use, the external heater (24, 26) ) contacts the aerosol-forming substrate (2).
    [0011]
    Aerosol generating device according to any one of the preceding claims, characterized in that the external heater (24, 26) is provided in a sleeve (73) which is movable relative to a housing of the device.
    [0012]
    Aerosol generating device according to any one of the preceding claims, characterized in that the device is an electrically heated smoke device.
    [0013]
    Method of heating an aerosol-forming substrate (2) as described in any one of claims 1 to 12, the method comprising: providing a first heater (22) capable of contacting an internal region of the aerosol-forming substrate; providing a second heater (24, 26) capable of contacting an external surface of the substrate; and provision of a controller (30), characterized by the fact that the controller (30) is configured to control the temperature of the first heater and the second heater, so that the second heater is at a lower temperature than the first heater.
    [0014]
    Method according to claim 13, characterized in that the external heater (24, 26) is controlled to have a temperature between 100 and 200 ° C.
    [0015]
    Method according to claim 13 or 14, characterized in that the internal heater (22) is controlled to have a temperature between 320 and 420 ° C.
    类似技术:
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    BR112014012258B1|2021-01-12|aerosol generating device and method of heating an aerosol-forming substrate
    EP2800486B1|2016-08-31|An aerosol generating device and system with improved airflow
    JP2018157822A|2018-10-11|Electrically heated aerosol-generating system with end heater
    KR102276054B1|2021-07-14|Heated aerosol-generating device and method for generating aerosol with consistent properties
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    同族专利:
    公开号 | 公开日
    UA113745C2|2017-03-10|
    EP2797445A1|2014-11-05|
    US9516899B2|2016-12-13|
    PL2797445T3|2016-11-30|
    SG11201403623YA|2014-07-30|
    JP2015506170A|2015-03-02|
    IL232364D0|2014-06-30|
    AU2012360817B2|2017-09-07|
    EP2797445B1|2016-05-04|
    MX354326B|2018-02-26|
    US20140305449A1|2014-10-16|
    MX2014008092A|2014-10-06|
    PT2797445E|2016-06-03|
    HUE028033T2|2016-11-28|
    ES2580407T3|2016-08-23|
    JP6026556B2|2016-11-16|
    NZ624109A|2016-04-29|
    BR112014012258A2|2017-06-13|
    CN103974640A|2014-08-06|
    CA2858289A1|2013-07-04|
    MY168355A|2018-10-31|
    KR102036030B1|2019-10-24|
    AU2012360817A1|2014-08-21|
    ZA201402658B|2015-03-25|
    RS54759B1|2016-10-31|
    KR20140116055A|2014-10-01|
    CN103974640B|2017-03-08|
    WO2013098395A1|2013-07-04|
    HK1198280A1|2015-03-27|
    RU2611487C2|2017-02-27|
    RU2014131464A|2016-02-20|
    DK2797445T3|2016-06-27|
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    法律状态:
    2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-10| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-07-28| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2020-11-03| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-01-12| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/12/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    EP11196232|2011-12-30|
    EP11196232.0|2011-12-30|
    PCT/EP2012/077062|WO2013098395A1|2011-12-30|2012-12-28|Aerosol generating device with improved temperature distribution|
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