• 专利附录
  • 专利说明
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    • 专利摘要:
    aerosol generating device and system with improved air flow. an aerosol generating system comprising an aerosol forming article comprising an aerosol forming substrate and a mouthpiece portion is provided to allow a user to inhale air through the substrate and an aerosol generating device, the device comprising an housing having proximal and distal ends and comprising at least one outer surface and one inner surface, the inner surface defining an open end cavity at the proximal end of the housing, into which the aerosol forming substrate is received, the cavity having a longitudinal extension between its proximal and distal ends, a heating element within the cavity configured to heat an aerosol-forming substrate received in the cavity and an air inlet; wherein the system comprises a first airflow channel extended from the air inlet to the distal end of the cavity, where the first airflow channel extends between the heater and the outer surface of the housing over at least one portion of the longitudinal extension of the cavity and a second airflow channel that extends from the distal end of the cavity to the nozzle portion.
    公开号:BR112014016463B1
    申请号:R112014016463-0
    申请日:2012-12-28
    公开日:2020-12-15
    发明作者:Julien Plojoux；Dani Ruscio；Olivier Greim；Yvan Degoumois
    申请人:Philip Morris Products S.A；
    IPC主号:
    专利说明:

    [001] The present specification refers to an aerosol-generating device that is configured to heat an aerosol-forming substrate and in particular to a design to ensure beneficial airflow through the device. The invention can be advantageously applied in portable heated smoke systems.
    [002] Hand-held aerosol generating devices that include a heater to heat aerosol-forming substrates are known in the art. Electrically heated smoking devices are an example of such a device. Aerosol forming substrates in electrically heated smoking devices typically need to be heated to temperatures of several hundred degrees Fahrenheit in order to release volatile compounds that can form an aerosol. The heater is typically located within the housing of the device in the position of the most natural part to hold during a smoking session. Therefore, it is that part of the housing that gets hotter during use.
    [003] It is desirable, from a consumer perspective, that electric smoke devices are small and easy to hold, approaching the size and shape of a conventional cigarette. One of the challenges with producing a device with such a small diameter is ensuring that the housing is not too hot in order to be uncomfortable to hold. For example, where a device is approximately the same size as a conventional cigarette or just large enough to receive a sized cigarette bar including an aerosol-forming substrate, the device may become uncomfortably hot.
    [004] It would be desirable to provide an aerosol generating device suitable for holding in the hand with a maximum comfortable temperature of the housing during operation. It would also be desirable to provide an aerosol generating device that includes a heater to heat the aerosol-forming substrate in which heat loss through the housing of the device is minimized.
    [005] In a first aspect of the present disclosure, an aerosol generation system is presented, which comprises:
    [006] an aerosol-forming article comprising an aerosol-forming substrate and a mouthpiece portion to allow a user to inhale air through the substrate and
    [007] an aerosol generating device, the device comprising a housing having proximal and distal ends and comprising at least one outer surface and one inner surface, the inner surface defining an open end cavity at the proximal end of the housing, in which the substrate aerosol forming material is received, the cavity having a longitudinal extension between its proximal and distal ends, a heating element within the cavity configured to heat the aerosol forming substrate received in the cavity and an air inlet,
    [008] wherein the system comprises a first airflow channel extended from the air inlet to a distal end of the cavity, wherein the first airflow channel extends between the heater and the outer surface of the housing along at least minus a portion of the longitudinal extension of the cavity and a second airflow channel extending from the distal end of the cavity to the nozzle portion.
    [009] The aerosol generation system can be an electrically heated hand smoke system.
    [0010] As used here, an ‘aerosol generating device refers to a device that interacts with an aerosol forming substrate to generate an aerosol. The aerosol forming substrate can be part of an aerosol generating article, for example, part of a smoke article. An aerosol generating device can be a smoking device that interacts with an aerosol forming substrate of an aerosol generating article to generate an aerosol that is directly inhaled into a user's lungs through the user's mouth. An aerosol generating device can be a fastener.
    [0011] As used herein, 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.
    [0012] As used herein, the terms 'aerosol generation 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 inhaled into a user's lungs through the user's mouth. An aerosol generating article may be disposable. The term ‘smoking article’ is generally used below. A smoking article can be, or can comprise, a tobacco stick.
    [0013] As used herein, the term 'aerosol generation system' refers to a combination of an aerosol generating device and one or more aerosol generating articles for use with the device. An aerosol generating system may include additional components such as, for example, a charging unit for recharging an electrical power supply built into an electric or electrically operated aerosol generating device.
    [0014] As used here, the term 'mouthpiece portion' refers to a portion of an aerosol generating article that is placed in the user's mouth in order to directly inhale the aerosol generated by the aerosol generating article or generating device of aerosol. The aerosol is transported to the user's mouth through the mouthpiece.
    [0015] By inhaling ambient air along the outside of the cavity in which the aerosol-forming substrate is heated, but inside the housing, the heat lost from the cavity is carried away from the outer surface of the housing. In fact, the incoming air cools the outer surface of the housing by removing excess heat before it reaches the exterior of the housing. This is beneficial as it ensures that the exterior of the housing in the cavity region is comfortable to hold while using the system.
    [0016] This provision also provides the preheat donate that is used in the generation and transport of the aerosol inside the device, reducing the amount of energy needed to be passed to the heater, making the device more efficient and providing a more even temperature distribution. uniform within the aerosol forming substrate.
    [0017] An additional advantage of this arrangement is that the first airflow channel that extends over at least a portion of the cavity reduces the amount of the secondary flow aerosol (which is the aerosol that escapes from the device rather than being passed for the user) when compared to the system in which air is inhaled directly from outside the device into a heated cavity. Secondary flow aerosol can be a significant concern during periods when the user is not inhaling air through the inlet channel.
    [0018] The first airflow channel can be positioned between the inner surface and the outer surface. Alternatively, or in addition, the first airflow channel can be located between the inner surface and the aerosol forming substrate.
    [0019] The device can comprise a plurality of air intakes. The number and size of the airflow inlets can be chosen to provide a desired inhalation resistance through the device. In an electric smoking device it may be desirable that the inhalation resistance (RTD) through the device and substrate is close to the inhalation resistance of a conventional cigarette.
    [0020] Resistance to inhalation is also known as resistance to airflow, resistance to breathing, resistance to puff or puffing capacity and is the pressure required to force air through the entire length of the object under test at the rate of 17.5 mL / s at 22 ° C and 101 kPa (760 Torr). It is typically expressed in units of mmH2O and is measured according to ISO 6565: 2011. The aerosol forming article and the aerosol generating device together advantageously provide an RTD between 80 and 120 mmH2O through the first and second airflow channels. This brings RTD closer to a conventional cigarette. The aerosol forming device, without an aerosol forming article coupled to it, can advantageously have an RTD between 5 and 20 mmH2O. The aerosol forming article alone can have an RTD between 40 and 80 mmH2O.
    [0021] The aerosol generating device advantageously provides more than 10% of the RTD through the first and second airflow channels. This allows the aerosol forming article to be made with a significantly lower RTD than that of a conventional cigarette while the system as a whole provides an RTD that mimics a conventional cigarette. In electrically heated smoking systems, a substrate containing less tobacco is typically needed than in a conventional fuel cigarette to provide the same length and number of puffs. This means that the smoking article can be made shorter, resulting in a lower RTD than a conventional cigarette. By using a device that provides significant RTD, no additional components are needed in the smoking article to increase the RTD of the smoking article. This keeps the cost of each smoking article as low as possible.
    [0022] If a plurality of air inlets are provided, they can be spaced around the circumference of the cavity to produce a uniform thermal profile for the housing and the substrate. The area of the total cross section of the air intakes is advantageously between 3 and 5 mm2.
    [0023] The air inlet or inlets may be at or near a proximal end of the cavity. Near a proximal end in this context means closer to the proximal end than to the distal end. The first airflow channel then extends along most of the longitudinal length of the cavity, providing an extended thermal contact between the airflow channel and the cavity. An additional advantage of positioning the air intake at a proximal end of the cavity is that it is unlikely to be blocked by a user's hand during use. The air intake can be produced on a proximal face of the housing to minimize the risk of blockage by a user. The first airflow channel can extend at least as long as the longitudinal extent of the heating element within the cavity and can extend substantially the entire length of the cavity. This allows the housing to cool over the entire length of the heating element within the cavity.
    [0024] The first airflow channel can be linear, extending directly from the air inlet or inlets to the distal end of the cavity. However, the first airflow channel can be formed in any shape, such as a helical shape or a tortuous shape. Different formed airflow paths can be used to provide different thermal profiles and to match other aspects of the device, such as the shape of the cavity and the heater. For example, if the heating element is formed as a helical heating element extended around the cavity, the first airflow channel can be formed in a corresponding helical shape outside the heating element. At least a portion of the first airflow channel can extend in parallel to a longitudinal extension of the heating element.
    [0025] If a plurality of air inlets are provided, they can be in fluid communication with a single first airflow channel substantially surrounding the cavity. This produces an air flow that substantially surrounds the substrate, reducing the chances of uneven temperature distribution outside the housing. The single first airflow channel may be in fluid communication with an air outlet or a plurality of air outlets at the distal end of the cavity.
    [0026] A distal end of the first airflow channel and a distal end of the second airflow channel can meet at an air outlet. The air outlet can be positioned around a distal end of the heating element. For example, the heating element can be a pin or blade heater that extends into the aerosol forming substrate. The air outlet can be positioned around a base of the pin or blade to efficiently transfer heat through the substrate by convection. The outlet and the substrate can be configured to cause laminar air flow through the substrate during normal operation.
    [0027] The housing may comprise a main body and a substrate holding portion, the substrate holding portion being separable from the main body and comprising at least a portion of the inner wall. The substrate holding portion can be provided to improve insertion and removal of aerosol forming substrates to and from the device. The air inlet can be formed in the holding portion of the substrate. The air outlet can be formed in the holding portion of the substrate.
    [0028] The heating element can be configured to heat an aerosol-forming substrate continuously during the operation of the device. "Continuously" in this context means that heating is not dependent on the flow of air through the device, so that the force can be passed to the heating element even when there is no air flow through the device. Cooling the device housing is particularly desirable in continuously heated systems as the temperature of the housing can rise in periods when power is being supplied to the heating element, but air is not being inhaled through the device. Alternatively, the device may include means for detecting airflow and the heating element may be configured to heat the aerosol-forming substrate only when the airflow exceeds a threshold level, indicative of a user inhaling into the device.
    [0029] The device may include an air intake adjustment element, allowing the size of the air intake to be adjusted. For example, the adjustment mechanism can be a housing coupled to the outside of the housing having an opening. The rotation or translation of the enclosure in the housing can block (totally or partially) one or more openings in the housing forming the air inlet or inlets. This provides the user with the ability to adjust the device to their preference.
    [0030] The device is preferably a portable device or coat that is comfortable to hold between the fingers of a single hand. The device can be substantially cylindrical in shape and has a length between 70 and 120 mm. The maximum diameter of the device is preferably between 10 and 20 mm. In one embodiment, the device has a polygonal cross section and has a projected button formed on one face. In this modality, the diameter of the device is between 12.7 and 13.65 mm taken from a flat face to an opposite flat face; between 13.4 and 14.2 taken from one edge to an opposite edge (that is, from the intersection of the two faces on one side of the device to a corresponding intersection on the other side) and between 14.2 and 15 mm taken from the top of the button to an opposite bottom flat face.
    [0031] The heating element may comprise an electrically resistive material. Suitable electrically resistive materials include, but are not limited to: semiconductors, such as doped 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 may comprise doped or non-doped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum, platinum, gold and silver. Examples of suitable metal alloys include alloys of stainless steel, nickel, cobalt, chromium, aluminum, titanium and zirconium, hafnium, niobium, molybdenum, tantalum, tungsten, tin, gallium, manganese, gold and those containing iron and super alloys based on nickel, iron, cobalt, oxidizable steel, Timetal® and alloys based on iron, manganese and aluminum. In composite materials, the electrically resistive material can optionally be embedded, encapsulated or coated with an insulating material or vice versa, depending on the energy transfer kinetics and the required external physiochemical properties. Alternatively, electric heaters may comprise a heating element infrared, a photonic source or an inductive heating element.
    [0032] The aerosol generating device may comprise an internal heating element or an external heating element or both internal and external heating elements, where "internal" and "external" refers to the aerosol-forming substrate. The internal heater can take any suitable shape. For example, the internal heater may be in the form of a heating blade. Alternatively, the internal heater may be in the form of a cover or substrate having different electroconductive portions or an electrically resistive metal tube. Alternatively, the internal heater may be one or more heating needles or rods that extend through the center of the aerosol-forming substrate. Other alternatives include a heating wire or filament, for example, Ni-Cr (nickel-chromium), platinum, tungsten or alloy wire or a heating plate. Optionally, the internal heating element can be deposited inside or on a material rigid carrier. 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 track in a suitable insulating material, such as a ceramic material such as zirconium dioxide and then compressed into another insulating material, such as glass. Heaters formed in this way can be used to heat and monitor the temperature of the heaters during operation.
    [0033] The external heater can take any suitable 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 formed 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 interconnection device (MID), a ceramic heater, a flexible carbon fiber heater or it can be formed using a technique coating, such as plasma vapor deposition, on a suitable formed 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 track between two layers of suitable insulating materials. The external heater formed in this way can be used to heat and monitor the temperature of the external heater during operation.
    [0034] The internal or external heater may comprise a heatsink 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 sink can be formed from any suitable material, such as a suitable metal or ceramic material. In one embodiment, the material has a high thermal capacity (heat sensitive 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 sensitive heat 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 or an alloy. The heat sink or heat sink can be arranged such 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 sink or heat sink can be transferred to the aerosol-forming substrate by means of a heat conductor, such as a metal tube.
    [0035] The heating element can heat the aerosol deformation substrate through conduction. The heating element may be at least partially in contact with the substrate or the carrier on which the substrate is deposited. Alternatively, the heat from an internal or external heating element can be conducted to the substrate by means of a conductive heat element.
    [0036] The aerosol forming article can be a smoking article. During operation, a smoke article containing the aerosol-forming substrate may be partially contained within the aerosol generating device.
    [0037] The smoke article can be substantially cylindrical. The smoking article can be substantially elongated. The smoking article may have a length and circumference substantially perpendicular to the length. The aerosol forming substrate can be substantially cylindrical in shape. The aerosol forming substrate can be substantially elongated. The aerosol forming substrate can also have a length and circumference substantially perpendicular to the length.
    [0038] The smoking article may have a total length between approximately 30 mm and approximately 100 mm. The smoke article can have an outside diameter between approximately 5 mm and approximately 12 mm. The smoking article may comprise a filter chunk. The filter chunk may be located at the downstream end of the smoke article. The filter chunk may be a cellulose acetate filter chunk. The filter chunk is approximately 7 mm long in one embodiment, but can be between approximately 5 mm to approximately 10 mm long.
    [0039] In one embodiment, the smoking article has a total length of approximately 45 mm. The smoke article can have an outside diameter of approximately 7.2 mm. In addition, the aerosol forming substrate may be approximately 10 mm long. Alternatively, the aerosol forming substrate may be approximately 12 mm long. In addition, the diameter of the aerosol forming substrate can be between approximately 5 mm and approximately 12 mm. 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 chunk. The separation can be approximately 18 mm, but can range from approximately 5 mm to approximately 25 mm.
    [0040] The aerosol forming substrate can be a solid aerosol forming substrate. Alternatively, the aerosol forming substrate may comprise both solid and liquid components. The aerosol forming substrate may comprise a tobacco containing material containing volatile tobacco flavor compounds that are released from the substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a tobacco-free material. The aerosol forming substrate may further comprise an aerosol former which facilitates the formation of a dense and stable aerosol. Examples of suitable aerosol builders are glycerin and propylene glycol.
    [0041] If the aerosol forming substrate is a solid aerosol deformation substrate, the solid 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 leaf, tobacco leaf, tobacco rib fragments, reconstituted tobacco, homogenized tobacco, extruded tobacco, fallen leaf tobacco and expanded tobacco. The solid aerosol-forming substrate can be in loose form or can be supplied in a suitable container or cartridge. Optionally, the deformation substrate of the solid aerosol may contain additional tobacco or non-tobacco volatile aroma compounds to be released by heating the substrate. The solid aerosol-forming substrate may also contain capsules which, for example, include additional tobacco or non-tobacco volatile flavor components, and such capsules may melt during heating of the solid aerosol-forming substrate.
    [0042] As used here, homogenized tobacco refers to the material formed by the agglomeration of particulate tobacco. The homogenized tobacco can be in the form of a leaf. The homogenized tobacco material can have an aerosol-forming content greater than 5% on a dry weight basis. The homogenized tobacco material may alternatively have an aerosol-forming content between 5% and 30% by weight on a dry weight basis. Leaves of homogenized tobacco material can be formed by agglomerating the particulate tobacco obtained by grinding or otherwise spraying one or both blades of the tobacco leaf and stems of the tobacco leaf. Alternatively, or in addition, sheets of homogenized tobacco material may comprise one or more of tobacco dust, tobacco fines and other by-products of particulate tobacco formed during, for example, the treatment, handling and shipping of the tobacco. Leaves of homogenized tobacco material may comprise one or more intrinsic binders, that is, endogenous tobacco binders, one or more extrinsic binders, that is, exogenous tobacco binders or a combination thereof to help agglomerate particulate tobacco; alternatively or in addition, sheets of 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 combinations thereof.
    [0043] In a particularly preferred embodiment, the aerosol-forming substrate comprises a shrunk folded sheet of homogenized tobacco material. As used herein, the term 'shrunk sheet' represents a sheet having a plurality of substantially parallel ridges or corrugations. Preferably, when the aerosol generating article is assembled, the substantially parallel ridges or corrugations extend along or parallel to the longitudinal geometric axis of the aerosol generating article. This advantageously facilitates the folding of the shrunk sheet of the homogenized tobacco material to form the aerosol forming substrate. However, it will be verified that shrunk sheets of homogenized tobacco material for inclusion in the aerosol generation article may alternatively or, in addition, have a plurality of substantially parallel ridges or corrugations that are arranged at an acute or obtuse angle to the longitudinal geometric axis of the aerosol generating article when the aerosol generating article is assembled. In certain embodiments, the aerosol forming substrate may comprise a folded sheet of homogenized tobacco material that is substantially uniformly textured over substantially its entire surface. For example, the aerosol forming substrate may comprise a folded shrunk sheet of homogenized tobacco material comprising a plurality of substantially parallel ridges or corrugations that are substantially uniformly separated across the width of the sheet.
    [0044] Optionally, the solid aerosol forming substrate can be supplied on or embedded in a thermally stable carrier. The carrier may take the form of powder, granules, pellets, fragments, spaghetti, strips or leaves. Alternatively, the carrier can be a tubular carrier having a thin layer of the solid substrate deposited on its inner surface or on its outer surface or on both its inner and outer surfaces. Such a tubular carrier can be formed, for example, from a paper or paper-like material, a non-woven carbon fiber mat, a low mass open mesh wire mesh or a perforated metal sheet or any other thermally stable polymer matrix .
    [0045] The solid aerosol-forming substrate can be deposited on the surface of the carrier in the form, for example, of a sheet, foam, gel or slurry. The solid aerosol-forming substrate can be deposited over the entire surface of the carrier or, alternatively, can be deposited in a pattern so as to produce a non-uniform flavor delivery during use.
    [0046] Although reference is made to solid aerosol-forming substrates above, it will be apparent to one skilled in the art that other forms of aerosol-forming substrate can be used with other modalities. For example, the aerosol-forming substrate may be a liquid aerosol-forming substrate. If a liquid aerosol forming substrate is provided, the aerosol generating device preferably comprises means for retaining the liquid. For example, the liquid aerosol forming substrate may 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 absorbent chunk or body, for example, a foamy metal or plastic material, polypropylene, terylene, nylon or ceramic fibers. The liquid aerosol forming substrate may be retained in the porous carrier material prior to use of the aerosol generating device or alternatively, the material of the liquid aerosol forming substrate may be released into the porous carrier material during or immediately before use. For example, the liquid aerosol-forming substrate can be supplied in a capsule. The capsule shell preferably melts on heating and releases the liquid aerosol-forming substrate in the porous carrier material. The capsule can optionally contain a solid in combination with the liquid.
    [0047] Alternatively, the carrier may be a non-woven cloth or bundle of fibers into which the tobacco components have been incorporated. The non-woven cloth or bundle of fibers may comprise, for example, carbon fibers, natural cellulose fibers or fibers derived from cellulose.
    [0048] The aerosol generating device may also comprise a power supply to supply power to the internal and external heaters. The power supply can be any suitable power supply, for example, a DC voltage source, such as a battery. In one embodiment, the power supply is a lithium-ion battery. Alternatively, the power supply can be a nickel-metal hydride battery, a nickel-cadmium battery or a lithium-based battery, for example, a lithium-cobalt, lithium-iron-phosphate, lithium- titanate or lithium-polymer.
    [0049] In another aspect of the disclosure, an aerosol generation device is presented as part of the system of the first aspect of the invention. In particular, an aerosol generating device is presented which comprises:
    [0050] a housing having proximal and distal ends and comprising at least one outer surface and one inner surface, the inner surface defining an open end cavity at the proximal end of the housing into which the aerosol forming substrate is received, the cavity having a longitudinal extension between its proximal and distal ends, a heating element within the cavity configured to heat an aerosol forming substrate received in the cavity, an air inlet, a first airflow channel extended from the air inlet to a distal end of the cavity, in which the first airflow channel extends between the inner surface and the outer surface of the housing along at least a portion of the longitudinal extension of the cavity and a second airflow channel extended from the distal end of the cavity to the proximal end of the cavity.
    [0051] The device advantageously provides an inhalation resistance (RTD) between 5 and 20 mmH2O through the first and second airflow channels in the absence of an aerosol-forming substrate in the cavity.
    [0052] In an additional aspect of the disclosure, a method for generating an aerosol from an aerosol-forming substrate is presented which comprises:
    [0053] heat the aerosol forming substrate and
    [0054] inhaling air along a first airflow path to the substrate extending from a proximal end to a distal end of the substrate and from the first airflow path to a second airflow path internal to the substrate extending from the distal end to the proximal end of the substrate.
    [0055] Although the disclosure has been described by reference to different aspects, it should be evident that the characteristics described in relation to one aspect of the disclosure can be applied to other aspects of the disclosure. In particular, aspects of a device forming part of a system according to one aspect of the invention can be applied to a device only according to another aspect of the invention.
    [0056] Examples of the invention will now be described in detail with reference to the accompanying drawings, in which:
    [0057] Figure 1 is a schematic diagram of an aerosol-generating device,
    [0058] Figure 2 is a schematic section of a first mode of a device of the type shown in Figure 1, showing the air flow path through the device,
    [0059] Figure 3 is a schematic end view of the device in Figure 2, illustrating air intakes positioned around an end face of the device,
    [0060] Figure 4 is a schematic section of a second modality of a device of the type shown in figure 1, showing the air flow path through the device and
    [0061] Figure 5 is a schematic diagram of the substrate extracting element shown in figure 4.
    [0062] In figure 1, the components of an embodiment of an electrically heated aerosol generation system 100 are shown in a simplified manner. In particular, the elements of the electrically heated aerosol generation system 100 are not drawn to scale in figure 1. Elements that are not relevant for understanding this modality have been omitted to simplify figure 1.
    [0063] The electrically heated aerosol generating system 100 comprises a housing 10 and an aerosol forming substrate 12, for example, a cigarette. The aerosol-forming substrate 12 is pushed into the housing 10 to be in thermal proximity to the heater 14. The aerosol-forming substrate 12 will release a range of volatile compounds at different temperatures. By controlling the maximum operating temperature of the electrically heated aerosol generation system 100 to stay below the release temperature of some of the volatile compounds, the release or formation of these smoke constituents can be prevented.
    [0064] Within the housing 10 there is a supply of electric power 16, for example, a rechargeable lithium ion battery. A controller 18 is connected to heater 14, electrical supply 16 and a user interface 20, for example, a button or monitor. Controller 18 controls the force supplied to the heater 14 in order to regulate its temperature. Typically, the aerosol forming substrate is heated to a temperature between 250 and 450 degrees centigrade.
    [0065] The aerosol-forming substrate requires both heat and airflow through the substrate to generate and release the aerosol. Figure 2 is a schematic representation of the air flow through the front or proximal end of the device. It is observed that figure 2 does not represent precisely the relative scale of the device elements, for example, the input channels. A smoke article 102, including an aerosol-forming substrate 12, is received into cavity 22 of device 100. Air is drawn into the device by the action of a user by sucking into a nozzle 24 of smoke article 102. The air is inhaled through the inlets 26 forming on a proximal face of the housing 10. The air inhaled into the device passes through an air channel 28 around the outside of the cavity 22. The inhaled air enters the aerosol-forming substrate 12 at the end distal from smoke article 102 adjacent to a proximal end of a blade-shaped heating element 14 provided in cavity 22. Inhaled air continues through substrate 12, carrying the aerosol and then to the mouth end of smoke article 102 .
    [0066] Air intakes 26 are shown schematically in figure 3. There are a plurality of intakes spaced around the circumference of the housing. Each of the inlets 26 is in fluid communication with the same internal airflow channel 28 surrounding the cavity 22. The inlets of figure 3 are circular, but can be of any shape. The size and number of inlets 26 can be chosen by the designer and can be chosen to provide a desired inhalation resistance through the device. In addition, means can be provided to adjust the resistance to inhalation by partially blocking the inlets. For example, a rotating element can be coupled to the housing of the proximal face 19, with rotational positions different from the rotating element blocking different numbers of the air intakes.
    [0067] In the modality shown in figure 2, the resistance to the inhalation of the system, including the device and the substrate is approximately 95 mmH2O. The inhalation resistance of the device only, without a substrate, is approximately 13 mmH2O. Inhalation resistance was measured according to ISO 6565: 2011 which establishes the standard for measuring inhalation resistance, using the pressure drop instrument SODIM, which is an instrument specially designed to measure the pressure drop through cigarettes and bars filter. The pressure drop instrument SODIM is available from SODIM SAS, 48 Rue Danton, 45404 Fleury-les- Aubrais cedex France. In order to measure the inhalation resistance of the device without a substrate, a 24 mm long, 7.8 mm diameter silicone tube was inserted into the cavity in place of the aerosol forming article. Inhalation resistance, both with and without the aerosol forming article, was measured several times to produce an average result.
    [0068] The air intakes are positioned on a front or approximate face of the housing. In this position, it is very unlikely that they will be inadvertently blocked by a user's hand during use. However, in a device where the user puffs directly into the device's housing, the air intakes must be positioned away from the user's mouth in use, to ensure that a sufficient supply of air can enter the device.
    [0069] The air channel 28 extends around the circumference of the cavity 22 to capture the heat lost from the cavity. The air inside the air channel 28 is thus heated before entering the cavity and passing through the substrate 12. This preheating of the air not only improves the efficiency of the device, but also ensures a more uniform temperature profile within of the substrate. The air channel 28 can consist of a plurality of separate channels spaced from one another or can be configured to force air to flow in a particular pattern around the cavity, but, in this example, comprises a single chamber that extends longitudinally.
    [0070] A pair of outlet openings 30 is provided between the airflow channel 28 and the cavity 22 at the distal end of the cavity. Again, the number, position and size of the output channels can be varied according to the particular operating parameters of the device.
    [0071] After the air has entered cavity 22, it is pulled beyond the blade-shaped heating element through the substrate, where it is still heated and carries the aerosol formed from the substrate. The air flow leaves the smoke article through the nozzle 24.
    [0072] In this example, the heating element is a single blade-shaped heater, positioned inside the substrate 12. Alternatively or, in addition, one or more heating elements can be provided at the periphery of the cavity, outside the substrate. In this case, the air flow channel is positioned between the heating elements and the external surface of the housing 10.
    [0073] Following the insertion of a smoke article 102 into cavity 22, the device of figures 1 and 2 is activated by a user using the user interface 20. Once activated, the heating element heats the substrate for a period of time predetermined, for example, seven minutes. During this time, the user can puff on the smoking article to inhale air through the device, so that the aerosol is passed to the user. The heater is configured to provide continuous heating during the period of operation, regardless of whether a user is puffing on the smoke article. As an alternative, the device can include an airflow sensor and the heater can be configured to heat the substrate only when an airflow threshold level is passing through the device.
    [0074] In use, the air flow around the cavity 22 reduces the temperature of the housing in the region of the cavity by several degrees centigrade when compared to the air inlets provided through the housing at a distal end of the cavity. This is beneficial as it allows the housing to remain at a temperature that is comfortable for the user to hold.
    [0075] The air flow channel (s) in figure 2 is inside the housing 10. However, alternatively or, in addition, it is possible that the air channels are formed between the housing and an inserted substrate. For example, the internal surface of the cavity can include one of many grooves for forming the air channel. Alternatively, the air flow channel (s) can be formed into separable portions of the housing. Figure 4 shows an embodiment in which the air flow channel (s) extends through two separable portions of the housing.
    [0076] In figure 4, the housing comprises two separable portions, a main body 10 and a substrate holding portion 40. The substrate holding portion 40 is shown coupled to the main body 10 in figure 4 and forms the proximal end of the device. The retaining portion of the substrate 40 is beneficial for removing the smoke article after use. There is a risk that removing the smoking article from the device simply by pulling the smoking article may break the smoking article, leaving a portion of it behind in the cavity 22, from which it is difficult to remove.
    [0077] Figure 5 is a schematic view of the substrate clamp portion 40 separated from the device. The substrate holding portion has a distal end 42, which is located within the main body 20 in use and on which the aerosol forming substrate is positioned in use, and a proximal end 44, which forms part of the outer surface of the housing. The retaining portion of the substrate has a cylindrical hole that defines the cavity 22.
    [0078] The distal end 42 of the substrate holding portion has an opening 46 through which the heating element 14 can pass. The distal end may also include windows 48, as shown, to allow direct contact between an aerosol-forming substrate and externally positioned heating elements. Alternatively, the distal end of the substrate holding portion may include one or more heating elements.
    [0079] The proximal end 44 of the substrate holding portion 40 includes air inlets 26 in the manner shown and described with reference to figure 3. An air flow channel 28b is formed at the proximal end 44 in communication with inlets 26. The channel airflow 28b is configured to pair and join with a corresponding airflow channel 28a in the main body 10. The grooves 46 formed at the distal end of the substrate holding portion 40 allow air to pass through the air channel 28a in the main body into the cavity 22, through the opening 46.
    [0080] Figures 4 and 5 illustrate only an example of separable portions of the housing and an air flow channel that extends within both portions. It should be evident that any combination of housing portions can be used while producing an air flow around the cavity 22 which is inhaled through the device by a user's puff.
    [0081] The securing portion of the separable substrate 40 may be suitable for particular users or types of particular substrate. By providing the securing portions of the substrate 40 with different sizes, shapes or numbers of air intakes 26, different resistance to inhalation may be provided. The smoke article, including the aerosol forming substrate, provides some resistance to inhalation and different substrates and nozzles will provide different resistance to inhalation. By providing different entrances 26 in the housing, the differences between different smoking articles can be compensated. Different fastening portions of the substrate can be provided to suit particular substrates. Alternatively, different fastening portions of the substrate can be provided simply for different user preferences.
    [0082] The exemplary modalities described above illustrate, but are not limiting. In view of the exemplary modalities discussed above, other modalities consistent with the exemplary modalities above will now be evident to one skilled in the art.
    权利要求:
    Claims (13)
    [0001]
    1. An aerosol generating device (100) comprising: a housing (10) having proximal and distal ends and comprising at least one outer surface and one inner surface, the inner surface defining an open end cavity (22) at the proximal end of the housing, the cavity having a longitudinal extension between its proximal and distal ends, a heating element (14) within the cavity configured to heat an aerosol forming substrate received in the cavity, an air inlet (26), a first air flow (28) extended from the air inlet to a distal end of the cavity, wherein the first air flow channel extends between the inner surface and the outer surface of the housing along at least a portion of the longitudinal extent of the cavity and a second airflow channel extended from the distal end of the cavity to the proximal end of the cavity, and where the distal end of the first air flow (28) and a distal end of the second air flow channel meet at an air outlet positioned around a base of the heating element (14), characterized by the fact that the heating element is in the form of a pin or blade that extends into the substrate.
    [0002]
    2. Aerosol generating device according to claim 1, characterized by the fact that the device (100) produces an inhalation resistance (RTD) between 5 and 20 mmH2O through the first and second air flow channels in the absence of an aerosol-forming substrate (12) in the cavity (22).
    [0003]
    3. Aerosol generation system, characterized by the fact that it comprises: an aerosol-forming article (102) comprising an aerosol-forming substrate (12) and a mouthpiece portion to allow a user to inhale air through the substrate; and an aerosol generating device (100), as defined in claim 1 or 2, the second airflow channel extending from the distal end of the cavity to the nozzle portion.
    [0004]
    4. Aerosol generation system according to claim 3, characterized by the fact that the aerosol forming article (102) and the aerosol generating device (100) together produce an inhalation resistance (RTD) between 80 and 120 mmH2O through the first and second airflow channels.
    [0005]
    5. Aerosol generation system, according to claim 4, characterized by the fact that the aerosol generation device (100) produces more than 10% of the RTD through the first and second airflow channels.
    [0006]
    An aerosol generation system according to any one of claims 3 to 5, characterized in that the air inlet (26) is at or near the proximal end of the cavity.
    [0007]
    Aerosol generation system according to any one of claims 3 to 6, characterized in that it comprises a plurality of air inlets (26).
    [0008]
    Aerosol generation system according to any one of claims 3 to 7, characterized in that the air inlet (26) or the plurality of air inlets has a total cross-sectional area between 3 and 5 mm2 .
    [0009]
    Aerosol generation system according to any one of claims 3 to 8, characterized in that at least a portion of the first airflow channel (28) extends parallel to a longitudinal extension of the heating element (14 ).
    [0010]
    An aerosol generation system according to any one of claims 3 to 9, characterized in that the housing comprises a main body and a substrate holding portion (40), the substrate holding portion being removable from the main body and comprising at least a portion of the interior wall defining the cavity, wherein the air inlet (26) is formed in the holding portion of the substrate.
    [0011]
    Aerosol generation system according to any one of claims 3 to 9, characterized in that the housing comprises a main body and a substrate holding portion (40), the substrate holding portion being removable from the main body and comprising interior walls defining the cavity, in which the outlet is formed in the holding portion of the substrate.
    [0012]
    Aerosol generation system according to any one of claims 3 to 11, characterized in that the heating element (14) is configured to heat an aerosol-forming substrate continuously during the operation of the device.
    [0013]
    Aerosol generation system according to any one of claims 3 to 12, characterized in that the housing (10) is generally cylindrical and has a maximum diameter between 10 and 20 mm.
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    同族专利:
    公开号 | 公开日
    HUE029516T2|2017-02-28|
    DK2800486T3|2016-10-31|
    EP2800486A2|2014-11-12|
    IL233464D0|2014-08-31|
    CA2862451A1|2013-07-11|
    BR112014016463A8|2017-07-04|
    WO2013102609A2|2013-07-11|
    JP5963375B2|2016-08-03|
    MX346864B|2017-04-04|
    RU2602053C2|2016-11-10|
    PL2800486T3|2016-12-30|
    WO2013102609A3|2014-04-10|
    ES2600458T3|2017-02-09|
    JP2015504667A|2015-02-16|
    NZ627174A|2015-10-30|
    PH12014501513B1|2014-10-08|
    US9532603B2|2017-01-03|
    CA2862451C|2020-02-18|
    PH12014501513A1|2014-10-08|
    PT2800486T|2016-11-08|
    US20140338686A1|2014-11-20|
    RU2014132080A|2016-02-20|
    MY168365A|2018-10-31|
    RS55149B1|2016-12-30|
    BR112014016463A2|2017-06-13|
    CN104135881A|2014-11-05|
    AU2012364360B2|2016-11-24|
    EP2800486B1|2016-08-31|
    SG11201403810SA|2014-10-30|
    AU2012364360A1|2014-08-21|
    KR101679489B1|2016-11-24|
    KR20140123487A|2014-10-22|
    HK1198464A1|2015-05-08|
    MX2014008234A|2015-01-19|
    LT2800486T|2016-10-10|
    CN104135881B|2016-11-09|
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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]|
    2020-06-23| B06A| Notification to applicant to reply to the report for non-patentability or inadequacy of the application [chapter 6.1 patent gazette]|
    2020-09-29| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-15| 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
    EP12150114.2|2012-01-03|
    EP12150114|2012-01-03|
    EP12155245|2012-02-13|
    EP12155245.9|2012-02-13|
    EP12183828.8|2012-09-11|
    EP12183828|2012-09-11|
    PCT/EP2012/077065|WO2013102609A2|2012-01-03|2012-12-28|An aerosol generating device and system with improved airflow|
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