RU2783143C1 - Aerosol generation system containing venturi element - Google Patents

Abstract

FIELD: tobacco industry.

SUBSTANCE: group of inventions relates to options of implementation of an aerosol generating system. The aerosol generation system contains aerosol forming substrate and a Venturi element, while the Venturi element contains an airflow channel. The airflow channel contains an inlet part, a central part, and an outlet part, while the inlet part is made converging in the direction of the central part, and the outlet part is made diverging from the central part. The inlet part is made converging in the direction of the central part at an inlet angle from 1° to 19°.

EFFECT: change in pressure is provided, which impacts on conversion of evaporated aerosol forming substrate into aerosol.

26 cl, 12 dwg

Description

The present invention relates to an aerosol generating system and a set of Venturi elements.

Cases are known of providing an aerosol generating device for generating inhaled vapor. Such devices can heat the aerosol-generating substrate to a temperature at which one or more components of the aerosol-generating substrate volatilize without burning the aerosol-generating substrate. Such aerosol generating substrates may be provided as part of an aerosol generating article.

Such aerosol generating articles (aerosol generating articles) may contain a plurality of components. For example, it is known to provide an aerosol generating article comprising a substrate portion, a filter portion, a cooling portion, and a separating portion. The cooling portion may comprise a corrugated sheet of material such as polylactic acid (PLA). The separating portion may comprise a hollow tube such as an acetate hollow tube. The separating portion may impart improved structural stability to the aerosol generating article and may contribute to improved aerosol generation. The cooling portion may contribute to improved aerosol generation.

Such aerosol generating devices may be configured to receive an aerosol generating article comprising an aerosol generating substrate. The aerosol generating article may be in the form of a rod for inserting the aerosol generating article into a cavity, such as a heating chamber, of the aerosol generating device. A heating element may be located in or around the heating chamber to heat the aerosol generating substrate when the aerosol generating article is inserted into the heating chamber of the aerosol generating device. Typically, one or more components of the aerosol-forming substrate are vaporized by the heating element, entrained in air to form an aerosol. Aerosol formation, in particular droplet size, depends on many factors such as temperature, air pressure.

US 4,517,996 A describes a filter device for a cigarette including a porous filter rod and a smoke-tight mouthpiece located at the smoke outlet end of the filter rod. The mouthpiece is formed with a converging nozzle open to the smoke outlet end of the filter rod, and with an expanding nozzle in fluid communication with the tapering nozzle open to the outlet or mouth end of the mouthpiece. In addition, a number of smoke flow capillaries passing through the mouthpiece are formed in the longitudinal direction. Each smoke flow capillary has an open inlet end open to the smoke outlet end of the filter rod and an open outlet end open to the mouth end of the mouthpiece. The tip material surrounds the filter rod and mouthpiece to hold them together and to attach the filter device to the tobacco column of the cigarette. The tip material is breathable over at least a portion of the filter rod.

It would be desirable to provide an aerosol generating system (aerosol generating system) with improved aerosol generation. It would be desirable to provide an aerosol generating system that facilitates the individualization of the generated aerosol. It would be desirable to provide an aerosol generating system with improved aerosol generation for various aerosol generating substrates. It would be desirable to provide an aerosol generating system with an improved RTD. It would be desirable to provide an aerosol generating system with improved taste sensation. It would be desirable to provide an aerosol generating system with improved flavor delivery. It would be desirable to provide an aerosol generating product containing fewer components.

According to an aspect of the present invention, an aerosol generating system (aerosol generating system) is provided, comprising an aerosol generating substrate and a Venturi element.

Economical fabrication is an advantage of providing a Venturi element in an aerosol generating system. By providing a Venturi element in the aerosol generating system, a separate cooling part such as a corrugated PLA sheet or a hollow acetate tube (HAT) may no longer be required for aerosol generation.

An aerosol generating system may include an aerosol generating article. An aerosol generating article may contain an aerosol generating substrate. An aerosol generating article may contain a Venturi element. The Venturi element may be part of the aerosol generating article, preferably an integral part of the aerosol generating article, more preferably integrally formed with the aerosol generating article. The Venturi element may be permanently attached to the aerosol generating article.

The user may not need to assemble the system, in particular attaching the Venturi element to the aerosol generating article. Simplification or ease of handling may be an advantage of an aerosol generating article containing a Venturi element. The simplification of the manufacture of the venturi element integral to the aerosol generating article may be another advantage due to the fact that the venturi element can be formed together with the aerosol generating substrate during the manufacture of the aerosol generating article. A further advantage of this aspect may be a stable smoking sensation, since during manufacture the correct alignment of the Venturi element with the aerosol generating substrate contained in the aerosol generating article can be guaranteed.

The term "part", preferably "an integral part", more preferably "formed in one piece" may mean a configuration in which the aerosol generating article and the Venturi element are integrally formed. In other words, the Venturi element and the aerosol generating article cannot be separated.

In some embodiments, the Venturi element may be configured to be attached to an aerosol generating article. Preferably, the Venturi element may be releasably attachable to the aerosol generating article.

Interchangeability is an advantage of the detachable configuration of the venturi element. The venturi element can be interchanged for different delivery profiles, different smoking sensations, and different ways of evaporating the aerosol. Different delivery profiles, different smoking sensations, and different ways of evaporating the aerosol may be referred to hereinafter as user experience. Personalization can be enjoyable for the user because the user can tailor the feel of use to their personal preferences. The user can change the attached venturi element according to the desired feel of use. According to this aspect, the Venturi element can be reusable, which can reduce waste.

The following describes in more detail the attachment between the Venturi element and the aerosol generating article. Preferably, in an aspect in which the Venturi element is releasably attached to the aerosol generating article, attachment is facilitated as described below. However, in the aspect in which the attachment will be permanent, the attachment as described below can also be used in such a way that the Venturi element is an integral part of the aerosol generating article.

An aerosol generating article may include a connecting part. The Venturi element may include an air flow channel containing an inlet portion. The Venturi element may contain a connecting element. The inlet part may contain a connecting element. The connecting element may alternatively be located adjacent to the inlet part. The connecting part of the aerosol generating article can be configured to receive in a detachable way the connecting element of the Venturi element.

In some embodiments, the implementation of the connecting part of the product that generates an aerosol, can be made in the form of a filtering part, in particular, in the form of a hollow acetate tube.

The connecting part may alternatively be made of any desired material which allows the connecting element of the Venturi element to be releasably received in the connecting part. The connecting element of the Venturi element may be an integral part of the Venturi element. The connecting element is preferably located at the upstream end of the Venturi element. The connecting element may be an integral part of the inlet part or located immediately adjacent to the inlet part. The connecting element may be made of a hard material which provides for piercing of the connecting part of the aerosol generating article. The connecting element may be configured to penetrate into the connecting part of the aerosol generating article. The connecting element of the Venturi element may comprise an air flow channel, preferably a hollow central air flow channel. The venturi connector may have a tapered configuration toward the upstream end of the connector to facilitate insertion of the connector into the connector of the aerosol generating article. The venturi element can then be positioned in close proximity to the aerosol generating article, more specifically to the connecting part of the aerosol generating article. The connecting part of the aerosol generating article may have a substantially tubular shape. The connecting part of the aerosol generating article may be of a hollow tubular shape so that the connecting element of the Venturi element can be inserted into the hollow tubular connecting part. The inner wall of the hollow tubular connecting part of the aerosol generating article may contain mechanical holding means configured to hold the connecting element of the Venturi element inside the connecting part of the aerosol generating article. The Venturi element may be provided as a reusable element to be used with multiple aerosol generating articles. After the aerosol generating article is used up, the Venturi element can be removed from the article and connected to a new article. For example, a Venturi element may be provided with a pack of aerosol generating articles so that the Venturi element can be used for all of the aerosol generating articles contained in the pack. Thus, costs can be reduced by providing one Venturi element for multiple aerosol generating articles.

The Venturi element connector may comprise mechanical holding means configured to hold the Venturi element connector inside the connector portion of the aerosol generating article. The mechanical holding means may be configured to permanently attach the Venturi element to the aerosol generating article. The mechanical containment means may also be configured to allow separation of the Venturi element from the aerosol generating article.

The connecting element of the Venturi element may contain mechanical holding means in the form of a step located along the outer perimeter of the connecting element. Advantageously, this helps to securely hold the connector within the connector of the aerosol generating article after the connector has been inserted into the connector. The mechanical retaining means may alternatively or additionally be in the form of a rib, a protrusion, a hook, or the like. Advantageously, this helps to securely hold the Venturi connector within the connector of the aerosol generating article. The connecting element of the Venturi element may have a circular cross section. Alternatively, the venturi element connector may have an oval cross section, a rectangular cross section, or another shaped cross section. Advantageously, this provides a keyed configuration. The keyed configuration may mean that the Venturi connector can only be inserted into the connector of the aerosol generating article in a particular orientation. If the connecting part of the aerosol generating article contains mechanical holding means, these mechanical holding means may be configured to engage or engage with the mechanical holding means of the Venturi element coupling.

The aerosol generating article may be in the form of a rod. The aerosol generating article can be made in the form of a rod. The aerosol generating article and the Venturi element may be in the form of a rod. The aerosol generating article and the Venturi element can be made in the form of a rod. The wrapping material, preferably wrapping paper, may be positioned to wrap the aerosol generating article. The wrapping material may be positioned to wrap the aerosol generating article and the Venturi element. In addition, individual components can be hidden with wrapping paper. This advantageously means that a uniform appearance can be achieved.

In the context of this document, the term "rod" can be used to refer to a generally cylindrical element with a substantially circular, oval or elliptical cross section.

The releasably attachable venturi element may be provided with a label located on the outside of the venturi element. The label may be an optical label or a tactile label. Preferably, the label contains a color. Alternatively or additionally, the label may comprise a surface structure for identifying the label. The label may assist the user in attaching the venturi element to the aerosol generating article in the correct direction. The label may indicate the correct attachment of the Venturi element to the aerosol generating article. For example, the releasably attachable venturi element may be provided with a label, preferably located on the outside of the venturi element, more preferably on the outside of the connecting part of the venturi element, most preferably on the wrapping material of the venturi element.

The Venturi element can be made with two fittings at opposite ends. The Venturi element may be attached to the aerosol generating article in one or more different orientations, preferably in reverse orientations. Different fittings may provide a different user experience when generating the aerosol. The first connecting portion may correspond to a first attachment orientation of the Venturi element to the aerosol generating article. The first attachment orientation may correspond to the first feel of use. The second connecting portion may correspond to a second attachment orientation of the Venturi element to the aerosol generating article. The second attachment orientation may correspond to the second feel of use.

The venturi element may be provided with two or more marks, preferably located on the outside of the venturi element, more preferably located on the outside of each connecting part of the venturi element, most preferably located on the wrapping material of the venturi element. For example, a Venturi element provided with two connecting parts can be made with one mark located on the outside of one first connecting part of the Venturi element, and with another mark on the outside of the second connecting part of the Venturi element. Labels may contain information for the user. For example, labels can indicate different user experiences. Different directions of attachment of the Venturi element to the aerosol generating article may be indicated by different labels. For example, the labels may be colored labels. The first attachment direction of the venturi member may correspond to a soft feel of use. The venturi element can be configured to create a soft feeling of use if it is attached to the aerosol generating article in the first direction. The second attachment direction of the Venturi element may correspond to a strong feeling of use. The Venturi element can be configured to create a strong feeling of use if it is attached to the aerosol generating article in the second direction.

Providing a Venturi element can enhance aerosol generation. Optimized aerosol droplets can be generated in the Venturi element. Typically, an aerosol generating article may be provided that includes elements such as a cooling section to cool the air stream passing through the article and to generate an inhalable aerosol within the article itself. By providing a Venturi element as in the present invention, an aerosol generating article can be made in a simpler manner. For example, a cooling section may potentially be missing. The Venturi element may be configured to reduce the temperature of the air containing the vaporized aerosol forming substrate flowing through the Venturi element. The venturi element, in particular the dimensions of the venturi element, is configured/adapted to generate an aerosol having a preferred droplet size, or preferred ranges of preferred droplet sizes, or a preferred droplet size distribution.

The Venturi element is configured to apply the Venturi effect. In other words, the Venturi element is shaped such that the Venturi effect occurs when fluid flows through the Venturi element. The Venturi element may be configured to apply or provide a Venturi effect, as described below. The Venturi element may include an air flow channel located along the longitudinal axis of the Venturi element. The air flow path may be a central air flow path.

The air flow channel may be located along the longitudinal axis of the venturi element so that the longitudinal axis of the aerosol generating article may be aligned with the longitudinal axis of the venturi element. In other words, the air flow path of the venturi element can be aligned with the aerosol generating article so that air can be drawn through the aerosol generating article and into the central channel of the venturi element for subsequent inhalation by the user.

The Venturi effect is a reduction in fluid pressure as fluid flows through a constricted air flow passage. The structural elements of the Venturi element according to the present invention will be described in more detail below. The venturi element contains a constricted airflow passage, also referred to as the center section. The fluid flowing through the Venturi element may be one or more of air, air containing or entrained in the vaporized aerosol forming substrate, and aerosol. Further, for simplicity, if the term "air" is used, this term may encompass air, air containing, or entrained in, an aerosol-forming vaporized substrate, or any mixture thereof. Preferably, air containing the vaporized aerosol-forming substrate flows through the central portion of the venturi element. After leaving the central part of the Venturi element, the air can expand and accelerate, as a result of which it cools. Cooling the air can lead to the formation of droplets and hence the generation of aerosol.

The venturi element may be located immediately downstream of the aerosol generating article and may be adjacent to the aerosol generating article.

In the context of this document, the terms "upstream" and "downstream" are used to describe the relative positions of the components or parts of the components of the Venturi element and the aerosol generating article according to the present invention relative to the direction of the air drawn through the Venturi element and the aerosol generating article. aerosol, during its use. The term "downstream" can be understood as being closer to the mouth end than to the distal end. The term "upstream" may be understood to mean closer to the distal end than to the mouth end.

In the context of this document, the term "aerosol generating article" refers to an article containing an aerosol generating substrate. In the context of this document, the term "aerosol generating substrate" refers to a material capable of releasing volatile compounds that can form an aerosol. For example, an aerosol generating substrate may be configured to generate an aerosol that a user can directly inhale into their lungs through their mouth. The aerosol generating article may be disposable.

The aerosol generating article may comprise a substrate portion containing an aerosol generating substrate and a filter portion. The filter part is preferably located downstream of the substrate part. Preferably, the Venturi element is located downstream of the filter section. Part in the form of a substrate may be located directly adjacent to the filter part. The filtering part may be located directly adjacent to the Venturi element.

The filter part may comprise, for example, a hollow tubular filter part, preferably a hollow acetate tube (HAT), a thin hollow acetate tube (FHAT), or a strand of tow that is wrapped around a central cardboard tube, all of which are known in the filter element art, used in aerosol generating products. The filter part preferably contains a hollow central hole.

The filter portion may be formed from any suitable material or combination of materials. For example, the filter portion may be formed from one or more materials selected from the group consisting of: cellulose acetate; cardboard; corrugated paper such as corrugated heat-resistant paper or corrugated parchment paper; and polymeric materials such as low density polyethylene (LDPE). In a preferred embodiment, the filter part is formed from cellulose acetate.

The filter part may include a hollow tubular element. In a preferred embodiment, the filter portion comprises a hollow cellulose acetate tube.

The filter portion preferably has an outer diameter that is approximately equal to the outer diameter of the aerosol generating article.

The filter portion may have an outer diameter of about 4 mm to about 8 mm. For example, the filter portion may have an outside diameter of about 5 mm to about 6 mm. In some embodiments, the filter portion may have an outer diameter of approximately 5.3 mm. The filter portion may have a length of from about 10 mm to about 25 mm. In some embodiments, the filter portion may be about 13 mm long.

The aerosol generating article may have a substantially cylindrical shape. However, other cross sections may alternatively be used. Indeed, the cross section of the aerosol generating article can be varied along its length, for example by changing the shape of the cross section or the dimensions of the cross section. The aerosol generating article may be substantially oblong. The aerosol generating article may have a length and a circumference substantially perpendicular to the length. The aerosol forming substrate may be substantially cylindrical in shape. The aerosol forming substrate may be substantially oblong. The aerosol forming substrate may also have a length and a circumference substantially perpendicular to the length.

The aerosol generating article may have an overall length of 30 mm to 60 mm, preferably 40 mm to 50 mm, more preferably 45 mm. The aerosol generating article may have an outer diameter of from about 4 mm to 8 mm, preferably from 5 mm to 6 mm, more preferably about 5.3 mm. In one embodiment, the aerosol generating article has an overall length of about 45 mm. In addition, the aerosol-forming substrate may have a length of 10 mm to 55 mm, preferably 20 mm to 55 mm. An aerosol generating article may include an outer paper wrapper.

As used herein, "aerosol generating device" refers to a device that interacts with an aerosol generating substrate to generate an aerosol. The aerosol generating substrate may be part of the aerosol generating article. The aerosol generating device may be a device that interacts with the aerosol generating substrate of the aerosol generating article to generate an aerosol. The aerosol generating device may include a housing, an electrical circuit, a power supply, a cavity, preferably in the form of a heating chamber, and a heating element.

The circuitry may include a microprocessor, which may be a programmable microprocessor. The microprocessor may be part of the controller. The electrical circuit may contain additional electronic components. The electrical circuit may be configured to control the power supply to the heating element. Power may be supplied to the heating element continuously after activation of the system, or may be supplied intermittently, for example, from puff to puff. Power may be supplied to the heating element in the form of electrical current pulses. The circuitry may be configured to monitor the electrical resistance of the heating element and preferably control the energization of the heating element in response to the electrical resistance of the heating element.

The device may contain a power supply, usually a battery, in a main body. Alternatively, the power supply may be another form of charge storage device, such as a capacitor. The power pack may need to be recharged and may be of sufficient capacity to store enough energy for one or more uses; for example, the power supply may have sufficient capacity to continuously generate an aerosol for a period of approximately six minutes, or for a period in multiples of six minutes. In another example, the power supply may have sufficient capacity to create an aerosol for multiple puffs.

The power supply may be any suitable power supply, such as a DC voltage source such as a battery. In one embodiment, the power supply is a lithium ion battery. Alternatively, the power supply may be a nickel metal hydride battery, a nickel cadmium battery, or a lithium battery such as a lithium cobalt, lithium iron phosphate, lithium titanium, or lithium polymer battery.

The cavity may be configured to receive one or more aerosol generating articles. The cavity may contain an aerosol-forming substrate. The cavity may surround the heating element. The cavity may be a heating chamber. The enclosed aerosol-forming substrate may be heated. The enclosed aerosol-forming substrate may be heated to a temperature above ambient. The temperature may be the temperature at which one or more volatile compounds are released from the aerosol-forming substrate and at which the aerosol-forming substrate does not ignite.

The heating element may be an internal heating element, where "internal" refers to the aerosol generating substrate. The inner heating element may take any suitable shape.

The internal heating element may be one or more heating needles or rods that extend through the center of the aerosol generating substrate, preferably positioned to at least partially penetrate the interior of the aerosol generating substrate.

Alternatively, the inner heating element may take the form of a heating plate. Alternatively, the internal heater may take the form of a sheath or substrate with various electrically conductive parts, or an electrically resistive metal tube. Other alternatives include a heating wire or filament such as Ni-Cr (nickel-chromium), platinum, tungsten or alloy wire, or a heating plate. Optionally, the internal heating element may be applied internally or externally to the rigid carrier material. In one such embodiment, the electrically resistive heating element may be formed using a metal having a particular relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track on a suitable insulating material such as ceramic material and then sandwiched between layers of another insulating material such as glass. The heaters thus formed can be used both for heating and for monitoring the temperature of the heating elements during operation.

The heating element may be an outdoor heating element, where "outer" refers to the aerosol generating substrate. The outer heating element may take any suitable shape. The heating element may take such a shape, preferably be configured to heat at least the outer surface of the aerosol generating substrate or the aerosol generating article containing the aerosol generating substrate.

Alternatively, the outer heating element may take the form of one or more sheets of flexible heating foil on a dielectric substrate, such as polyimide. Sheets of flexible heating foil can be shaped to fit the perimeter of the cavity. Alternatively, the outer heating element may take the form of a metal grid or grids, a flexible printed circuit board, a molded connector (MID), a ceramic heater, a flexible carbon fiber heater, or may be formed using a coating technique such as plasma vapor deposition on appropriately shaped substrate. The outer heating element may also be formed using a metal having a certain 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 outer heating element thus formed can be used both for heating and monitoring the temperature of the outer heating element during operation. An external heating element may be located around the perimeter of the cavity.

The inner or outer heating element may comprise a heat sink or heat reservoir containing a material capable of absorbing and storing heat and subsequently releasing heat over time into the aerosol forming substrate. The heatsink may 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 through a reversible process such as a high temperature phase transition. Suitable sensitive heat storage materials include silica gel, alumina, carbon, glass mat, fiberglass, minerals, metal or alloy such as aluminum, silver or lead, and cellulosic material such as paper. Other suitable materials that release heat as a result of a reversible phase change include paraffin, sodium acetate, naphthalene, wax, polyethylene oxide, a metal, a metal salt, a mixture of eutectic salts, or an alloy. The heat sink or heat reservoir may be positioned so that it is in direct contact with the aerosol generating substrate and can transfer the stored heat directly to the substrate. Alternatively, heat stored in a radiator or heat reservoir can be transferred to an aerosol-forming substrate via a heat conductor such as a metal tube.

The heating element can heat the aerosol-generating substrate by conduction. The heating element may at least partially be in contact with the substrate or carrier on which the substrate is applied. Alternatively, heat from either the outer or inner heating element may be conducted to the substrate via a heat transfer element.

The aerosol generating device may comprise an external heating element, or an internal heating element, or both external and internal heating elements.

The venturi element may be positioned for connection downstream to the heating chamber of the aerosol generating device. The heating chamber may be configured such that an aerosol generating article may be inserted into the heating chamber. After being inserted into the heating chamber, the aerosol generating article can be positioned upstream of the Venturi element.

The present invention may also relate to a system comprising an aerosol generating article described herein and a Venturi element described herein, alone or as part of an aerosol generating device described herein. In some embodiments, the aerosol generating article is separate from the venturi element. In some embodiments, the aerosol generating article is separate from the aerosol generating device. In some embodiments, the venturi element is separate from the aerosol generating device. In some embodiments, both the aerosol generating article and the venturi element are separate from the aerosol generating device, but not from each other. In some embodiments, both the aerosol generating article and the venturi element are separate from the device and from each other. In some embodiments, the aerosol generating article is configured to engage with the Venturi element. In some embodiments, an aerosol generating article is configured to engage with an aerosol generating device. In some embodiments, the Venturi element is configured to engage with an aerosol generating device. In some embodiments, the aerosol generating article is configured to engage with the Venturi element in a reversible manner. In some embodiments, the aerosol generating article is configured to engage with the aerosol generating device in a reversible manner. In some embodiments, the Venturi element is configured to engage with the aerosol generating device in a reversible manner.

The venturi element may contain an air flow channel, while the air flow channel may comprise an inlet part, a central part and an outlet part, while the inlet part can be made with the possibility of convergence towards the central part, and the outlet part can be made with the possibility of diverging from the central part.

The inlet may be located adjacent to the upstream end of the Venturi element. The outlet may be located adjacent to the downstream end of the Venturi element. The inlet part may be located opposite the outlet part. The central part may be located between the inlet part and the outlet part. The inlet part may be located directly adjacent to the central part. The central part may be located directly adjacent to the outlet part. The inlet part may be designed so that air enters the venturi element. The outlet portion may be configured to draw air from the Venturi element. The inlet part, the central part and the outlet part may be fluidly connected to each other. The inlet part, the central part and the outlet part together can form a channel for the air flow of the Venturi element. The inlet part, the central part and the outlet part can together provide air flow through the venturi element.

The term "converging" may mean that the inner diameter of the inlet portion may decrease towards the central portion. In other words, the inner diameter of the inlet portion may decrease from an upstream direction to a downstream direction. The inlet portion may have a hollow conical shape. The inlet part can be narrowed towards the central part.

The term "divergent" may mean that the inner diameter of the outlet portion may increase towards the downstream end of the venturi element. In other words, the inner diameter of the outlet portion may increase from an upstream direction to a downstream direction. The outlet portion may have a hollow conical shape. The outlet part can be narrowed towards the central part. The central part may have a constant diameter.

The inner part, the central part and the outlet part may have a circular cross section. The inner part, the central part and the outlet part may have different cross sections. One or more of the inner part, the central part and the outlet part may have a circular cross section, an oval cross section, a rectangular cross section, or a cross section of another shape. The only requirement of the Venturi element is that the cross-sectional area of the central part is smaller than the cross-sectional area of the outlet part, so that the central part is a constricted passage for the air flow. The central part is optional. The central part is the part with the smallest diameter between the inlet part and the outlet part. The central part may be of any suitable length, preferably the central part is less than 4 mm, more preferably less than 2 mm, most preferably less than 1 mm. In a particularly preferred embodiment, there is no central part where the inlet part and the outlet part directly adjoin each other. In this case, the term "central part" can be used to refer to the cross section of the Venturi part where the narrowing is the smallest, even if the inlet part and the outlet part are physically in contact in this cross section. In this embodiment, the length of the central cross section can in principle be zero.

The Venturi element can be made in the form of a mouthpiece of an aerosol generating device. The Venturi element can be made in the form of a mouthpiece or as part of a mouthpiece. The mouthpiece is preferably in the form of a reusable mouthpiece to be used with multiple aerosol generating articles. Typically, aerosol generating articles may be provided with a cooling section to cool the air jet and to enable aerosol generation. Such a cooling section can be eliminated by using a mouthpiece venturi element according to the present invention.

The Venturi element may be part of an aerosol generating device. The Venturi element can be provided separately from the aerosol generating device, but it can be connected to the aerosol generating device, for example, by means of a hinge. The Venturi element may be an integral part of the aerosol generating device. The Venturi element can be made in the form of a mouthpiece of an aerosol generating device. The Venturi element can be made in the form of a separate mouthpiece, connected to the device that generates the aerosol.

An aerosol generating article may contain a portion of an aerosol generating substrate. An aerosol-forming substrate is a substrate capable of releasing volatile compounds that can form an aerosol. The aerosol generating substrate may conveniently be part of an aerosol generating article or an aerosol generating article. Volatile compounds can be released by heating the aerosol-forming substrate. The aerosol forming substrate may contain nicotine. The aerosol-forming substrate may comprise a tobacco-containing material containing volatile tobacco flavor compounds that are released from the aerosol-forming substrate upon heating. The aerosol forming substrate may alternatively comprise a non-tobacco material. The aerosol-forming substrate may be a non-liquid aerosol-forming substrate. Alternatively, the aerosol forming substrate may contain both non-liquid and liquid components. As a further alternative, the aerosol-forming substrate may be provided in liquid form.

In some embodiments of the present invention, an aerosol generating system may comprise: an aerosol generating article containing an aerosol generating non-liquid substrate and a Venturi element. The Venturi element may be configured to be attached to an aerosol generating article.

The aerosol generating substrate may contain at least one aerosol generating agent. The aerosol generating agent is any suitable known compound or mixture of compounds which, when used, promotes the formation of a dense and stable aerosol and which is substantially resistant to thermal degradation at the operating temperature of the system. Suitable aerosol forming agents are, for example: polyhydric alcohols such as triethylene glycol, 1,3-butanediol and glycerol; esters of polyhydric alcohols such as glycerol mono-, di- or triacetate; and aliphatic esters of mono-, di- or polycarboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate. The aerosol forming agents can be polyhydric alcohols or mixtures thereof, such as triethylene glycol, 1,3-butanediol and glycerol. The aerosol generating agent may be propylene glycol. The aerosol forming agent may contain both glycerin and propylene glycol.

Preferably, the amount of aerosolizing agent is from 6 percent to 20 percent by weight, based on the dry weight of the aerosol-generating substrate, more preferably, the amount of aerosolizing agent is from 8 percent to 18 percent, by weight, based on the dry weight of the aerosol-generating substrate. , most preferably the amount of aerosol-forming agent is from 10 percent to 15 percent by weight, based on the dry weight of the aerosol-forming substrate. In some embodiments, the amount of aerosolizing agent has a target value of about 13 percent by weight based on the dry weight of the aerosolizing substrate. The most effective amount of aerosol generating agent will also depend on the aerosol-forming substrate, whether the aerosol-forming substrate contains plant lamina or homogenized plant material. For example, among other factors, the type of substrate will determine the extent to which the aerosol generating agent can promote the release of substances from the aerosol generating substrate.

The aerosol-forming substrate may comprise a non-liquid aerosol-forming substrate. The aerosol-forming substrate may be a non-liquid aerosol-forming substrate. The aerosol-forming substrate may comprise a non-liquid aerosol-forming substrate. The non-liquid aerosol-forming substrate may comprise a plant-based material. The non-liquid aerosol-forming substrate may contain tobacco. The non-liquid aerosol-forming substrate may comprise homogenized plant-based material, including homogenized tobacco, for example, made by, for example, a papermaking process or a molding process. An aerosol generating article containing a non-liquid substrate forming an aerosol containing tobacco may be referred to as a tobacco stick. Preferably, the aerosol-forming substrate is non-liquid. Preferably, the aerosol-forming substrate is liquid-free. The non-liquid aerosol-forming substrate may contain at least one aerosol-forming agent. In some embodiments, at least one aerosolizing agent may be at least one of the compounds described above. For example, the aerosol-forming substrate may contain aerosol-forming agents such as polyhydric alcohols. During, for example, the manufacture of an aerosol generating article, at least one aerosol generating agent may be absorbed into the non-liquid aerosol generating substrate. For example, during the manufacture of an aerosol generating article, at least one aerosol generating agent may be absorbed into, for example, a plant-based material such as homogenized tobacco. When the non-liquid aerosol-forming substrate is heated, the aerosol-forming substance may evaporate. The aerosolizing agent can form an aerosol together with volatile compounds from a non-liquid aerosol-forming substrate, such as nicotine or nicotine salts.

Advantageously, a more natural taste and appearance of the aerosol generating article can be obtained by using a plate of natural plant material. The term "lamina" refers to the part of the leaf blade of a plant without a stem.

If the aerosol-forming substrate comprises a non-liquid aerosol-forming substrate, preferably a solid aerosol-forming substrate, then we have the following. The solid aerosol-forming substrate may contain, for example, one or more of the following: powder, granules, pellets, pieces, thin tubes, strips, or sheets containing one or more of the following: grass leaf, tobacco leaf, tobacco vein fragments, homogenized leaf tobacco, preferably reconstituted tobacco, more preferably molded tobacco, extruded tobacco and expanded tobacco.

The non-liquid aerosol-forming substrate may be an electrically heated tobacco product (EHTP). In some embodiments, all of the tobacco in the EHTP may be homogenized leaf tobacco, preferably reconstituted tobacco, preferably shaped-leaf tobacco made from tobacco powder, water, glycerin, guar gum, and cellulose fibers. The non-liquid aerosol-forming substrate may be made from tobacco in the form of a molded sheet. Tobacco in the form of a molded sheet can be assembled and corrugated. Tobacco in the form of a molded sheet can be made from sheets of homogenized tobacco materials through a reconstitution process. The recovery process may be a "formed sheet" process or molding. Sheets of homogenized tobacco material may be collected. Sheets of homogenized tobacco material may be formed by a forming process of the type that typically involves forming a slurry containing loose tobacco and one or more binders onto a conveyor belt or other support surface, drying the shaped slurry to form a sheet of homogenized tobacco material, and removing the sheet of homogenized tobacco material from the support surface. For example, in some embodiments, sheets of homogenized tobacco material for use in the present invention may be formed by a slurry molding process containing loose tobacco, guar gum, cellulose fibers, and glycerin.

As used herein, the term "gathered" may mean that the sheet of homogenized tobacco material is folded, folded, or otherwise compressed or narrowed substantially transverse to the cylindrical axis of the rod.

The term "sheet" may refer to a plate-like element having a width and length substantially greater than its thickness.

The term "length" may refer to the dimension in the direction of the cylindrical axis of the rod.

The term "width" may refer to a dimension in a direction substantially perpendicular to the cylindrical axis of the rod.

The rod may be an integral part of the filter portion of the aerosol generating article. The rod may be an integral part of the aerosol generating substrate. The rod may comprise a sheet of homogenized tobacco material surrounded by a wrapping material. Rods that may contain a sheet of homogenized tobacco material advantageously show significantly lower standard deviations in weight than rods containing pieces of tobacco material. The weight of a rod of a particular length may be determined by the density, width, and thickness of the sheet of homogenized tobacco material that is assembled to form the rod. The weight of the rods of a certain length can be controlled by controlling the density and dimensions of the homogenized tobacco material sheet. This reduces weight discrepancies between rods of the same size according to the present invention and thus results in a lower rejection rate for rods whose weight is outside the selected allowable range. Rods containing a sheet of homogenized tobacco material advantageously show more uniform densities than rods containing pieces of tobacco material.

Incorporating the assembled sheet of homogenized tobacco material into the rods advantageously significantly reduces the risk of tobacco flaking compared to rods containing pieces of tobacco material.

In the context of this document, the term "homogenized tobacco" refers to a material formed by agglomeration of bulk tobacco. The homogenized tobacco may be in the form of a leaf. The aerosolizing agent content of the homogenized tobacco material may be greater than 5% on a dry weight basis. Alternatively, the aerosolizing agent content of the homogenized tobacco material may be from 5% to 30% by weight, based on dry weight. Sheets of homogenized tobacco material can be formed by agglomeration of bulk tobacco obtained by grinding or otherwise combining one or both of the tobacco leaf blade and tobacco leaf stems. Alternatively or additionally, the sheets of homogenized tobacco material may contain one or more of tobacco dust, tobacco fines, and other bulk tobacco by-products generated, for example, during tobacco processing, handling, and shipping. Sheets of homogenized tobacco material may contain one or more internal binders, ie tobacco endogenous binders, one or more external binders, ie tobacco exogenous binders, or a combination thereof, to promote agglomeration of bulk tobacco; alternatively or additionally, the homogenized tobacco material sheets may contain other additives, including, but not limited to, tobacco and non-tobacco fibers, aerosolizers, humectants, plasticizers, flavorants, fillers, aqueous and non-aqueous solvents, and combinations thereof.

The aerosol-forming solid substrate may be in loose form or may be provided in a suitable container or cartridge. Optionally, the aerosol-forming solid substrate may contain additional tobacco or non-tobacco volatile flavor compounds to be released upon heating of the substrate. The solid aerosol-forming substrate may also contain capsules which contain, for example, additional tobacco or non-tobacco volatile flavor compounds, and such capsules may melt during heating of the solid aerosol-forming substrate.

The non-liquid aerosol-forming substrate may be applied to the surface of the carrier in the form of, for example, a sheet, foam, gel, or suspension. The non-liquid aerosol-forming substrate may be applied to the entire surface of the carrier, or alternatively may be applied in a pattern to provide non-uniform flavor delivery during use.

Preferably, the non-liquid aerosol-forming substrate contains cut filler. In this document, "cut filler" is used to refer to a mixture of ground plant material, in particular leaf blade, processed stems and veins, homogenized plant material, for example, made into the form of a sheet using molding or papermaking processes. The cut filler may also contain other cut tobacco, tobacco filler or casing. According to preferred embodiments of the present invention, the cut filler comprises at least 25 percent of the plant leaf blade, more preferably at least 50 percent of the plant leaf blade, even more preferably at least 75 percent of the plant leaf blade, and most preferably at least 90 percent of the leaf blade. plants. Preferably, the plant material is one of tobacco, mint, tea, and clove, however, the present invention is equally applicable to other plant material that has the ability to release substances upon application of heat, which can subsequently form an aerosol.

Preferably, the tobacco plant material comprises a flake of one or more of a flake of light tobacco, dark tobacco, flavored tobacco, and tobacco filler. Light tobacco species are tobacco species usually with large, light-colored leaves. Throughout this specification, the term "light tobacco" is used for tobaccos that have been fire-cured. Examples of light tobaccos are Chinese flue-cured tobacco, Brazilian flue-cured tobacco, American flue-cured tobacco such as Virginia tobacco, Indian flue-cured tobacco, Tanzania flue-cured tobacco or other African flue-cured tobaccos. Light tobacco is characterized by a high ratio of sugar and nitrogen. From an organoleptic point of view, light tobacco is a type of tobacco that, after drying, is associated with a spicy and full-bodied sensation. According to the present invention, light tobaccos are tobaccos with a reducing sugar content of from about 2.5 percent to about 20 percent based on the dry weight of the leaf and a total ammonia content of less than about 0.12 percent based on the dry weight. sheet. Reducing sugars contain, for example, glucose or fructose. The total ammonia content is, for example, ammonia and ammonia salts. Dark tobaccos are tobaccos usually with large, dark-colored leaves. Throughout the description, the term "dark tobacco" is used for types of tobacco that have been subjected to air drying. Additionally, dark tobaccos can be fermented. Types of tobacco used mainly for chewing, sniffing, cigars and pipe blends are also included in this category. Typically, these dark tobaccos are air-dried and possibly fermented. From an organoleptic point of view, dark tobacco is a type of tobacco which, after drying, is associated with the smoky feel of dark cigars. Dark tobacco is characterized by a low ratio of sugar and nitrogen. Examples of dark tobaccos are Burley Malawi or other types of African Burley, dark dried Brazilian Galpao, Indonesian sun-dried or air-dried Kasturi. According to the present invention, dark tobaccos are tobaccos with a reducing sugar content of less than about 5 percent based on the dry weight of the leaf and a total ammonia content of not more than about 0.5 percent based on the dry weight of the leaf. Flavored tobaccos are tobaccos that often have small, light-colored leaves. Throughout the description, the term "aromatic tobacco" is used in relation to other types of tobacco, which are characterized by a high content of aromatic substances, such as essential oils. From an organoleptic point of view, aromatic tobacco is a type of tobacco which, after drying, is associated with a spicy and aromatic sensation. Examples of aromatic tobacco types are Oriental Greek, Oriental Turkish, Semi-Oriental tobacco, but also fire-cured tobacco, American Burley, such as Perique, Makhorka, American Burley or Maryland. Tobacco filler is not a specific type of tobacco, but includes types of tobacco that are primarily used to supplement other types of tobacco used in a blend and that do not impart a particular characteristic flavor property to the final product. Examples of tobacco fillers are stems, midribs or stems of other types of tobacco. A specific example is fire-cured stems from the lower petioles of Brazilian fire-cured tobacco.

The cut filler suitable for use in the present invention may generally resemble the cut filler used for conventional smoking articles. The cutting width of the cut filler is preferably 0.3 mm to 2.0 mm, more preferably the cut width of the cut filler is 0.5 mm to 1.2 mm, and most preferably the cut width of the cut filler is 0.6 mm to 0 .9 mm. The width of the cut can play a role in the distribution of heat within the substrate portion of the article. In addition, the width of the cut can play a role in the drag resistance of the product. In addition, the width of the slicing can affect the overall density of the substrate portion.

The length of the threads of the cut filler is somewhat random, as the length of the threads will depend on the overall size of the object from which the thread is cut. However, by maintaining appropriate conditions for the material prior to cutting, such as controlling the moisture content and overall fineness of the material, longer strands can be cut. Preferably, the filaments are from about 10 millimeters to about 40 millimeters long before the filaments are formed into a section of the substrate. Obviously, if the filaments are located in a section of the substrate in a longitudinal extent, where the longitudinal extent of the section is less than 40 millimeters, the final section of the substrate may contain filaments that are shorter on average than the length of the original thread. Preferably, the length of the threads of the cut filler is such that from about 20 percent to 60 percent of the threads run the entire length of the substrate portion. This prevents the filaments from easily separating from the substrate section.

The weight of the non-liquid aerosol-forming substrate is 80 milligrams to 400 milligrams, preferably 150 milligrams to 250 milligrams, more preferably 170 milligrams to 220 milligrams. This amount of aerosol-forming substrate will generally produce enough material to form an aerosol. In addition, in light of the aforementioned diameter and size limitations, this provides a balanced density of the aerosol forming substrate between energy absorption, draw resistance and fluid passages in the substrate section where the substrate contains plant material.

The non-liquid aerosol-forming substrate portion of the aerosol-forming article may have a length of 20 mm to 40 mm, preferably about 25 mm to 35 mm. In some embodiments, the aerosol generating substrate portion of the aerosol generating article may have a length of about 32 mm. The aerosol-generating substrate portion of the aerosol-generating article may have an outer diameter of from about 4 mm to about 8 mm. For example, the aerosol-generating substrate portion of the aerosol-generating article may have an outer diameter of from about 5 mm to about 6 mm. In some embodiments, the aerosol forming substrate portion may have an outer diameter of approximately 5.3 mm.

In the context of this document, the term "non-liquid aerosol-forming substrate" means a substrate capable of releasing volatile compounds that can form an aerosol. The substrate may not be liquid. The substrate may be provided in the form of a gel. The substrate may be viscous. The substrate may be provided in the form of a viscous gel. Volatile compounds may be released by heating the aerosol-forming substrate. The aerosol generating substrate may conveniently be part of the aerosol generating article. The aerosol-forming substrate may be an aerosol-forming liquid substrate. The aerosol-forming liquid substrate may contain other additives and ingredients such as flavors. If the aerosol-generating substrate is provided in liquid form, in the liquid aerosol-generating substrate, certain physical properties, such as the vapor pressure or viscosity of the substrate, are chosen to be suitable for use in the aerosol-generating system. The liquid preferably contains a tobacco-containing material containing volatile tobacco flavor compounds that are released from the liquid upon heating. The liquid may include water, ethanol or other solvents, herbal extracts, nicotine solutions, and natural or artificial flavors. Preferably, the liquid further comprises an aerosol generating agent. Examples of suitable aerosol forming agents are glycerin and propylene glycol. The concentration of nicotine in the aerosol-forming liquid substrate may be from about 0.5% to about 10%, such as about 2%.

If the aerosol-generating substrate is provided in liquid form, the liquid aerosol-generating substrate may be contained in the liquid storage portion of the aerosol-generating article. The aerosol generating product may be in the form of a cartridge. The liquid storage portion is adapted to store an aerosol-generating liquid substrate to be supplied to a heating element of the aerosol-generating device. Alternatively, the cartridge itself may comprise a heating element for evaporating the aerosol-forming liquid substrate. In this case, the aerosol generating device may not include a heating element, but only supply electrical power to the heating element of the cartridge when the cartridge is received by the aerosol generating device. The liquid storage portion may contain compounds, such as self-healing pierceable membranes, to facilitate delivery of the aerosol-forming liquid substrate to the heating element. The membranes prevent unwanted leakage of the aerosol-forming liquid substrate stored in the liquid storage portion. A suitable needle-shaped hollow tube may be provided for piercing the membrane. The liquid storage part may be in the form of a replaceable tank or container.

The cartridge may be of any suitable shape and size. For example, the cartridge may be substantially cylindrical. The cross section of the cartridge may be, for example, substantially circular, elliptical, square or rectangular.

The cartridge may include a casing. The casing may include a base and one or more side walls extending from the base. The base and one or more side walls may be integrally formed. The base and one or more side walls may be separate elements that are attached or attached to each other. The casing may be a rigid casing. In the context of this document, the term "hard shell" is used to refer to a shell that is self-supporting. The rigid cartridge case may provide mechanical support for the heating element. The cartridge may contain one or more flexible walls. The flexible walls may be configured to accommodate the volume of the aerosol-forming liquid substrate stored in the cartridge. Preferably, the cartridge comprises, as described above, a liquid storage portion, which may include a flexible wall. The cartridge may include a rigid case, while a fluid storage portion containing a flexible wall may be housed within the rigid case. The cartridge case may comprise any suitable material. The cartridge may comprise a substantially liquid-impermeable material. The cartridge case may include a transparent or translucent portion so that the aerosol forming liquid substrate stored in the cartridge may be visible to a user through the case. The cartridge can be configured such that the aerosol forming substrate stored in the cartridge is protected from ambient air. The cartridge may be designed such that the aerosol forming substrate stored in the cartridge is protected from light. This can reduce the risk of substrate degradation and can maintain a high level of hygiene.

The cartridge may be substantially sealed. The cartridge may include one or more outlets for the aerosol generating liquid substrate stored in the cartridge to flow from the cartridge into the aerosol generating device. The cartridge may contain one or more semi-open inlets. This can allow ambient air to enter the cartridge. The one or more semi-open inlets may be semi-permeable membranes or check valves, permeable enough to allow ambient air to enter the cartridge and impervious enough to substantially prevent air and liquid within the cartridge from leaving the cartridge. One or more semi-open inlets may allow air to pass into the interior of the cartridge under specific conditions. The cartridge may be refillable. Alternatively, the cartridge may be in the form of a replaceable cartridge. The aerosol generating device may be configured to receive a cartridge. A new cartridge may be attached to the aerosol generating device when the original cartridge is used up.

The aerosol-forming liquid substrate may be retained in the container. Alternatively or additionally, the aerosol-forming liquid substrate may be absorbed into the porous carrier material. The porous carrier material can be made from any suitable absorbent plug or piece, such as metal or plastic foam, polypropylene, terylene, nylon fibers, or ceramic. The aerosol generating liquid substrate may be retained in the porous carrier material prior to use of the aerosol generating device, or alternatively the aerosol generating liquid substrate material may be released into the porous carrier material during or immediately prior to use. For example, an aerosol-forming liquid substrate may be provided in a capsule. The capsule shell preferably melts when heated and releases the aerosol-forming liquid substrate into the porous carrier material. The capsule may optionally contain a non-liquid substance in combination with a liquid.

Alternatively, the carrier may be a nonwoven web or fiber bundle in which tobacco components have been incorporated. The nonwoven web or fiber bundle may contain, for example, carbon fibres, natural cellulose fibers or fibers from cellulose derivatives. The aerosol generating device preferably includes liquid retention means.

The venturi element may contain an air flow channel, while the air flow channel may comprise an inlet part, a central part and an outlet part, while the inlet part can be made with the possibility of convergence towards the central part, and the outlet part can be made with the possibility of diverging from the central part.

In the central part, the pressure of the air or aerosol flowing through the central part decreases while the flow rate increases. The central part is especially important for determining the resistance to flow, more preferably the resistance to draw during a session of use. For example, if the diameter of the central part decreases, the draw resistance increases. Typically, the draw resistance may depend on the cross-sectional area of the core. The cross-sectional area of the central portion can be configured to optimize the draw resistance to a desired value. The pleasant smoking experience can be influenced in a desired manner by selecting a particular diameter or cross-sectional area of the core. In some embodiments, the implementation of the length of the Central part may have some effect on the resistance to draw. For example, if the length of the central part increases. In some embodiments, the preferred optimized draw resistance of the Venturi element alone can be between 5 mmH2O. Art. up to 60 mm w.c. Art., preferably from 5 mm of water. Art. up to 30 mm w.c. Art., more preferably from 10 mm of water. Art. up to 15 mm w.c. Art. In some embodiments, the preferred optimized draw resistance of the venturi element along may be about 12 mmH2O. Art. In some embodiments, the optimized draw resistance of the device and consumable component together can be between 50 mmH2O. Art. up to 60 mm w.c. Art., preferably from 52 mm of water. Art. up to 56 mm w.c. Art.

The angle between the longitudinal axis of the inlet part and the inner wall of the inlet part may be referred to as the inlet angle. The longitudinal axis of the inlet may be identical to the longitudinal axis of the Venturi element. The inlet angle can influence the conversion of the vaporized aerosol forming substrate into an aerosol. The inlet angle can contribute to a change in pressure that affects the conversion of the vaporized aerosol-forming substrate into an aerosol. In some embodiments, a smaller inlet angle may be associated with a relatively longer inlet length of the inlet portion. Depending on the type of substrate forming the aerosol, an appropriate inlet angle and inlet length can be selected. For example, in some embodiments, an aerosol-forming liquid substrate, such as e-liquid, may require a relatively smaller entry angle, while a non-liquid aerosol-forming substrate, such as tobacco, may require a relatively larger entry angle.

The angle between the longitudinal axis of the outlet part and the inner wall of the outlet part may be referred to as the outlet angle. The longitudinal axis of the outlet may be identical to the longitudinal axis of the Venturi element.

The release angle can affect the aerosol delivery area. The delivery zone may be an area along the user's mouth. The delivery zone may be an area typically located along a longitudinal axis along the user's mouth. For example, the delivery zone may be the tip of the user's tongue, the middle of the user's tongue, the back of the user's tongue, or the back of the user's throat, or any other perceptible areas along the user's mouth.

The vaporized aerosol-forming substrate can be converted to an aerosol. The spatial distance covered by the vaporized aerosol-forming substrate before it is converted to an aerosol may be referred to as the vapor path. This conversion may take place in the air flow path of the Venturi element. The steam path can be affected by changes in pressure. Changes in pressure can affect the steam path. The change in pressure can initiate the conversion of the vaporized aerosol-forming substrate into an aerosol. The change in pressure can be controlled by the inlet angle. The steam path can neither be too long nor too short. If the vapor path is too long, the vaporized aerosol-forming substrate may be deposited on the inside of the Venturi element and may condense there. The condensed substrate forming an aerosol may flow out of the system. Leakage from the system can be unpleasant for the user. On the other hand, if the vapor path is too short, the vaporized aerosol-forming substrate cannot be satisfactorily converted into an aerosol. The desired vapor path may depend on the type of substrate, in particular whether a liquid or non-liquid substrate is used, as described below.

The type of vaporized substrate forming the aerosol can influence the vapor path. For example, an aerosol-forming liquid substrate, such as electronic cigarette liquid, has a relatively short vapor path. For example, an aerosol-forming substrate in the form of an electronic cigarette liquid may have a typical vapor path of about 2 mm to 5 mm, such as 3 mm. In comparison, a non-liquid aerosol-forming substrate such as tobacco has a relatively longer vapor path. For example, an aerosol forming substrate comprising a tobacco molded sheet may have a vapor path of about 10 mm to 15 mm, such as 12 mm.

The outlet angle can affect the steam path. The path of the aerosol vapor exiting the Venturi element can be influenced in the desired manner by selecting a particular outlet angle.

The aerosol flow path, or at least the delivery zone in the user's mouth, can be affected by the angle of release. The trajectory or delivery area of the aerosol exiting the venturi can be influenced in the desired manner by selecting a particular outlet angle. In addition, the exit angle of the aerosol can be affected by the exit angle. The outlet velocity may denote the flow rate of the aerosol as it exits the venturi element. With one or more of the aerosol trajectory and the velocity of the aerosol leaving the Venturi element, the aerosol delivery zone in the user's mouth can be influenced in a desired manner. Thus, the aerosol delivery zone can be optimized by selecting a specific release angle. The aerosol delivery zone may be in the user's mouth. The delivery zone may be an area typically located along a longitudinal axis along the user's mouth. The delivery zone may be the tip of the user's tongue. The delivery zone may represent the middle of the user's language. The delivery zone may be the back of the user's tongue. The delivery zone may be the back of the user's throat. The delivery zone may be any other perceptible area along the user's mouth. A delivery zone described as "frontward", "forward", "front of mouth", "further forward", or the like, refers to a delivery zone located relatively closer to the wearer's lips or front teeth, such as as incisors in the mouth than to the user's back molars, wisdom teeth, or throat of the mouth. A delivery zone described as “backwards”, “backwards”, “back of the mouth”, “further backs”, etc. refers to a delivery zone located relatively closer to the user's back molars, wisdom teeth or throat of the mouth than to the user's lips or front teeth such as incisors.

Some users may find it desirable to have a sensation when delivered closer to the front of the mouth. Some users may find it desirable to have a sensation when delivered closer to the back of the mouth. This delivery feel can be affected by the release angle. For example, if the release angle is large, the flavor of the aerosol can be delivered closer to the back of the user's mouth. If the release angle is large, delivery of the aerosol may provide a stronger taste sensation in the throat. If the release angle is small, the flavor of the aerosol can be delivered closer to the front of the user's mouth.

In some embodiments, if the outlet angle is large, the length of the outlet portion is shorter. The exit velocity of the aerosol may be high. Thus, the delivery sensation may be closer to the back of the user's throat. In some embodiments, if the outlet angle is small, the length of the outlet portion is longer. The exit velocity of the aerosol may be low.

The inlet portion may be configured to converge toward the central portion at an inlet angle of 1° to 20°, preferably 16° to 20°, more preferably 17° to 19°, most preferably 18°. This inlet angle is particularly preferred if a non-liquid aerosol-forming substrate is used. In an alternative embodiment of the present invention, the inlet portion may be configured to converge toward the central portion at an inlet angle of 1° to 20°, preferably 5 to 15°, more preferably 8 to 11°, most preferably 9.5°.

The outlet part can be made diverging from the central part at an outlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°. This outlet angle is particularly preferred if a non-liquid aerosol-forming substrate is used. In an alternative embodiment of the present invention, the outlet portion may diverge from the central portion at an outlet angle of 2° to 10°, preferably 3° to 6°, more preferably 4.4°.

If the aerosol generating article contains a non-liquid aerosol generating substrate, these particular inlet and outlet angles are advantageous. After evaporation of the non-liquid aerosol-forming substrate, the droplet size or droplet size distribution of the generated aerosol can be optimized by selecting the above inlet angle.

In some embodiments, the vapor path when using a non-liquid aerosol forming substrate may be 10 mm to 14 mm, preferably 11 mm to 13 mm, more preferably 12 mm. Transformation of the vaporized non-liquid aerosol-forming substrate may take place in one or more of the cooling portion of the aerosol-generating article and the Venturi element, preferably in the air flow path of the Venturi element, more preferably in the inlet of the Venturi element. Preferably, the conversion takes place partly in the cooling part and partly in the Venturi element. Thus, the vapor path may be partly in the aerosol generating article and partly in the Venturi element. After evaporation of the non-liquid aerosol-forming substrate, the vapor path can be optimized by selecting the above inlet angle. In this aspect, a large pressure change can be applied at the inlet of the Venturi element. This particular pressure change can be achieved with an inlet angle such as 18°.

In addition to optimizing droplet size by means of the inlet angle, the above outlet angle can optimize the desired delivery feel. The inlet part may be made converging towards the central part at an inlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°. This inlet angle is particularly preferred if an aerosol-forming liquid substrate is used.

The outlet may be radiated from the central portion at an outlet angle of 16° to 20°, preferably 17° to 19°, more preferably 18°. This outlet angle is particularly preferred if an aerosol-forming liquid substrate is used.

These specific angles are advantageous if the aerosol generating article is an aerosol generating article containing an aerosol generating liquid substrate. The vapor path of the vaporized liquid aerosol-forming substrate may be shorter than the vapor path of the vaporized non-liquid aerosol-forming substrate. The vapor path when using an aerosol-forming liquid substrate may be from 1 mm to 4 mm, preferably from 2 mm to 3 mm. The conversion of the vaporized liquid substrate to form an aerosol may take place in the venturi element, preferably in the air flow path of the venturi element, more preferably in the inlet of the venturi element. In an aspect in which a liquid aerosol-forming substrate is used, the vapor path may be shorter compared to when a non-liquid aerosol-forming substrate is used. A steam path of 2 mm to 3 mm, for example, can be provided by a particular change in pressure. In some embodiments, a particular pressure change may be a relatively small pressure change. This particular pressure change can be achieved with the particular inlet angle described herein, such as 6°. Such an inlet angle may be sufficient to optimize the vapor path of the vaporized liquid substrate forming the aerosol.

In addition to the optimized droplet size due to the inlet angle, the above outlet angle can optimize the desired delivery feel.

The axial length of the inlet portion when using an aerosol generating article with a non-liquid aerosol generating substrate may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm. In an alternative embodiment of the present invention, the axial length of the inlet may be 1 mm to 10 mm, preferably 2 mm to 7 mm, more preferably 2.5 mm to 4 mm, most preferably 3 mm.

The axial length of the outlet may be 14 mm to 35 mm, preferably 19 mm to 28 mm, more preferably 23 mm. In an alternative embodiment of the present invention, the axial length of the outlet may be from 10 mm to 50 mm, preferably from 14 mm to 35 mm, more preferably from 20 mm to 30 mm, most preferably 26 mm.

The axial length of the inlet portion when using an aerosol generating article with an aerosol generating liquid substrate may be 14 mm to 35 mm, preferably 19 mm to 28 mm, more preferably 23 mm.

The axial length of the outlet when using an aerosol generating article with an aerosol generating liquid substrate may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm.

The axial length of the central portion when using an aerosol generating article with a non-liquid aerosol-forming substrate or liquid aerosol-forming substrate may be 2 mm to 5 mm, preferably 3 mm to 4 mm, more preferably 3.2 mm. Particularly preferably, the central part is formed by the transition between the inlet part and the outlet part. In some embodiments, the implementation of the central part may have a non-essential length, or, for example, be less than 1 mm. In an alternative embodiment of the present invention, the axial length of the central portion may be from 0 mm to 8 mm, preferably less than 6 mm, more preferably less than 2 mm, most preferably less than 1 mm.

The inner diameter of the central part when using the aerosol generating article with a non-liquid aerosol-generating substrate or with a liquid aerosol-generating substrate can be from 0.5 mm to 1.5 mm, preferably from 0.8 mm to 1.2 mm , more preferably 1 mm. In an alternative embodiment of the present invention, the inner diameter of the core is 0.5 mm to 5 mm, preferably 1 mm to 4 mm, more preferably 1.5 mm to 3 mm, most preferably 2 mm.

The maximum inner diameter of the inlet part may be 1 mm to 10 mm, preferably 2 mm to 5 mm, more preferably 2.5 mm to 4 mm, most preferably 3 mm.

The maximum inner diameter of the outlet is 3 mm to 15 mm, preferably 4 mm to 10 mm, more preferably 5 mm to 7 mm, most preferably 6 mm.

The outlet portion may comprise threads. The threads may preferably comprise screw threads. The threads may be configured to create a swirling air flow. The threads can create turbulence. The threads may be located on the inner wall of the outlet portion. The threads may be located along the entire length of the outlet portion. The threads may be located along parts of the outlet part, preferably adjacent to the downstream end of the outlet part. The thread pitch may be from 1 mm to 7 mm, preferably about 5 mm.

The Venturi element may comprise a central axial tube having a relatively smaller outer diameter than the diameter of the central portion. The central axial tube may start at the beginning of the inlet portion as viewed from the upstream end of the venturi element towards the downstream end of the venturi element. The central axial tube may extend along the entire length of the Venturi element. The central axial tube may pass through the inlet part, the central part and the outlet part. The central axial tube may terminate at the end of the central portion as viewed from the upstream end towards the downstream end. The central axial tube may start at the central portion and terminate at the end of the outlet portion. The central axial tube may be oblong. The central axial tube may have a cylindrical shape. The central axial tube is preferably hollow. The central axial tube is preferably located along the longitudinal axis of the Venturi element. The central axial tube is preferably positioned such that air can flow through the central axial tube towards the downstream end of the venturi element. The central axial tube is preferably positioned such that air can flow around the central axial tube through the central portion and into the outlet portion and subsequently out of the venturi element. The central axial tube is preferably positioned such that two flow paths are created, one through the central axial tube and the other around the central axial tube. If the central shaft tube passes completely through the inlet part, the central part and the outlet part, the air flowing through the central shaft pipe can be directly delivered to the user's mouth regardless of the air flowing around the central shaft pipe. Alternatively, if the center shaft terminates at the end of the center portion, air flowing from the center shaft may combine with air flowing around the center shaft at the outlet. The central axial tube preferably has a constant diameter. The central axial tube is preferably configured such that the air flowing through the central axial tube flows in a laminar flow.

The Venturi element may include an impeller at or downstream of the outlet. The impeller can create a pleasant mouth filling in the user's mouth. The impeller may have 2 to 6 blades, preferably 3 blades. The pitch of the impeller may be from 1 mm to 10 mm, preferably about 6 mm. The impeller pitch can be defined as the displacement that the impeller makes during a full 360° rotation in a hypothetical solid material. The impeller may be integrally formed with the Venturi element. The impeller may be provided as a separate element connected to the Venturi element. The outlet may include attachment means for attaching the impeller to the outlet. The fastening means may be provided by a groove for the nut. The impeller may be attached to the outlet by means of a locking connection. The impeller may be made of the same material as the Venturi element. The central axis of the impeller can be aligned along the longitudinal axis of the Venturi element.

The impeller can be combined with a central axial tube as described above. In this embodiment, the central axial tube preferably starts in the central part when viewed from the upstream direction towards the downstream direction. The central shaft preferably extends all the way to the ends of the outlet so that air flowing through the central shaft can exit the central shaft directly into the user's mouth. In this embodiment, the impeller may be located around the central axial tube, preferably adjacent to the downstream end of the outlet portion. The impeller can optimize the flow of air, which is the air flowing around the central axial tube. The impeller can be made stationary or freely rotating.

The Venturi element may include a vent. The vent may be located on one or more of the inlet part, the central part and the outlet part. More than one vent may be provided. The vent can create a fluid connection between the outside of the venturi element and the corresponding part of the venturi element on which the vent is located. Preferably the vent is located in the central part. This arrangement may have the advantage that air is drawn from the outside of the venturi element into a central portion where the air can be mixed with the air flow through the venturi element. Air can be drawn from the outside of the venturi into the center because the air pressure in the center can be lower than the air pressure outside the venturi due to the venturi effect. The mixture of outside air with the airflow from the substrate portion of the aerosol generating article can create an optimized aerosol.

The venturi element may include a second air flow channel parallel to the first air flow channel. The venturi element may include a second inlet part, a second central part and a second outlet part. The second inlet portion may be configured to converge towards the second central portion, and the second outlet portion may be configured to diverge from the second central portion.

The second inlet part, the second central part and the second outlet part may form a second air flow path. The second air flow channel may be arranged parallel to the first air flow channel. The first and second air flow channels may be arranged parallel to the longitudinal axis of the Venturi element. Air flowing through the first air flow passage may be combined with air flowing through the second air flow passage at or downstream of the venturi element. The air drawn in from the substrate portion or the filter portion of the aerosol generating article and entering the Venturi element may be divided between the first air flow passage and the second air flow passage. With regard to the dimensions of the second air flow channel, the second air flow channel may be similar to the first air flow channel as described above, but in a mirror image configuration. In other words, the second air flow path may be in the form of a reversed first air flow path.

If two air flow passages are provided, a common upstream portion may be provided for dividing the air flow between the inlet portions of the first and second air flow passages. The common upstream portion may be located between the substrate portion or filter portion of the aerosol generating article and the air flow channels. The common upstream portion may be located within the Venturi element. By providing two airflow channels, an optimized draw resistance (RTD) can be achieved. In some embodiments, the preferred optimized draw resistance of the Venturi element alone can be between 5 mmH2O. Art. up to 60 mm w.c. Art., preferably from 5 mm of water. Art. up to 30 mm w.c. Art., more preferably from 10 mm of water. Art. up to 15 mm w.c. Art. In some embodiments, the preferred optimized draw resistance of the venturi element along may be about 12 mmH2O. Art. In some embodiments, the optimized draw resistance of the device and consumable component together can be between 50 mmH2O. Art. up to 60 mm w.c. Art., preferably from 52 mm of water. Art. up to 56 mm w.c. Art. A greater degree of filling of the oral cavity can be influenced by the provision of two channels for air flow. The organoleptic feel and delivery profile of the feel of use can be adjusted by adjusting the design of the two airflow channels.

If the aerosol-generating article contains a non-liquid aerosol-generating substrate, the inlet portion of the second air flow passage may converge towards the central portion of the second air flow passage at an inlet angle of 2° to 10°, preferably 4° to 8° , more preferably 6°. The axial length of the inlet part may be from 14 mm to 35 mm, preferably from 19 mm to 28 mm, more preferably 23 mm. The axial length of the central portion may be 2 mm to 5 mm, preferably 3 mm to 4 mm, more preferably 3.2 mm. The central portion of the second air flow passage may have an axial length of approximately 1.6 mm. The outlet of the second air flow channel may be radiated from the central part of the Venturi element at an outlet angle of 16° to 20°, preferably 17° to 19°, more preferably 18°. The axial length of the outlet portion may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm.

If the aerosol-generating article contains an aerosol-forming liquid substrate, the inlet portion of the second air flow passage may converge towards the central portion of the second air flow passage at an inlet angle of 16° to 20°, preferably 17° to 19° , more preferably 18°. The axial length of the inlet part may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7 mm. The axial length of the central portion may be 2 mm to 5 mm, preferably 3 mm to 4 mm, more preferably 3.2 mm. The central portion of the second air flow passage may have an axial length of approximately 1.6 mm. The outlet of the second air flow channel may be radiated from the central part of the Venturi element at an outlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°. The axial length of the outlet may be 14 mm to 35 mm, preferably 19 mm to 28 mm, more preferably 23 mm.

A venturi element containing two airflow channels with the configurations described above can be used as a universal venturi element. The versatile Venturi element can be used with an aerosol generating article containing an aerosol generating non-liquid substrate. The versatile Venturi element can be used with an aerosol generating article containing an aerosol generating liquid substrate.

In a venturi element containing two airflow channels with the configurations described above, each of the airflow channels can be configured to close. The air flow channels may be independently closed. Closing the air flow passage may prevent air from flowing through the passage. The closure of one of the airflow channels can be manually provided. The closure of one of the airflow channels can be provided automatically. A detector may be provided to detect the type of substrate forming the aerosol. If an aerosol-generating article containing a non-liquid aerosol-forming substrate is used, an airflow channel with an inlet angle smaller than the outlet angle as described above may be used, and the other airflow channel may be closed, or vice versa.

If each airflow channel is open, a versatile venturi element can be used with an aerosol generating article containing an aerosol generating liquid substrate and a non-liquid aerosol generating substrate. In this aspect, liquid and non-liquid aerosol-forming substrates can be heated in parallel.

The present invention may further relate to a venturi element for use with an aerosol generating article comprising an aerosol generating substrate. The Venturi element may include a channel for air flow. The air flow channel may comprise an inlet part, a central part and an outlet part. The inlet part is made converging towards the central part, and the outlet part is made diverging from the central part.

The axial length of the central portion may be 2 mm to 5 mm, preferably 3 mm to 4 mm, more preferably 3.2 mm. Particularly preferably, the central part is formed by the transition between the inlet part and the outlet part. The central part may have an insignificant length.

The inner diameter of the central part may be 0.5 mm to 1.5 mm, preferably 0.8 mm to 1.2 mm, more preferably 1 mm.

The inlet part may be made converging towards the central part at an inlet angle of 16° to 20°, preferably 17° to 19°, more preferably 18°. This inlet angle is particularly preferred if a non-liquid aerosol-forming substrate is used.

The outlet part can be made diverging from the central part at an outlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°. This outlet angle is particularly preferred if a non-liquid aerosol-forming substrate is used.

The axial length of the inlet portion when using an aerosol generating article with a non-liquid aerosol generating substrate may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm.

The axial length of the outlet when using an aerosol generating article with a non-liquid aerosol generating substrate may be 14 mm to 35 mm, preferably 19 mm to 28 mm, more preferably 23 mm.

If the aerosol-generating article contains an aerosol-forming liquid substrate, the inlet portion may be configured to converge toward the central portion at an inlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°.

The outlet, when using an aerosol generating article with an aerosol-forming liquid substrate, can be configured to radiate from the central portion at an outlet angle of 16° to 20°, preferably 17° to 19°, more preferably 18°.

The axial length of the inlet portion when using an aerosol generating article with an aerosol generating liquid substrate may be 14 mm to 35 mm, preferably 19 mm to 28 mm, more preferably 23 mm.

The axial length of the outlet when using an aerosol generating article with an aerosol generating liquid substrate may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm.

The outlet portion may comprise threads. The threads may preferably comprise screw threads. The threads may be configured to create a swirling air flow. The threads can create turbulence. The threads may be located on the inner wall of the outlet portion. The threads may be located along the entire length of the outlet portion. The threads may be located along parts of the outlet part, preferably adjacent to the downstream end of the outlet part. The thread pitch may be from 1 mm to 7 mm, preferably about 5 mm.

The Venturi element may comprise a central axial tube having a relatively smaller outer diameter than the diameter of the central portion. The central axial tube may start at the beginning of the inlet portion as viewed from the upstream end of the venturi element towards the downstream end of the venturi element. The central axial tube may extend along the entire length of the Venturi element. The central axial tube may pass through the inlet part, the central part and the outlet part. The central axial tube may terminate at the end of the central portion as viewed from the upstream end towards the downstream end. The central axial tube may start at the central portion and terminate at the end of the outlet portion. The central axial tube may be oblong. The central axial tube may have a cylindrical shape. The central axial tube is preferably hollow. The central axial tube is preferably located along the longitudinal axis of the Venturi element. The central axial tube is preferably positioned such that air can flow through the central axial tube towards the downstream end of the venturi element. The central axial tube is preferably positioned such that air can flow around the central axial tube through the central portion and into the outlet portion and subsequently out of the venturi element. The central axial tube is preferably positioned such that two flow paths are created, one through the central axial tube and the other around the central axial tube. If the central shaft tube passes completely through the inlet part, the central part and the outlet part, the air flowing through the central shaft pipe can be directly delivered to the user's mouth regardless of the air flowing around the central shaft pipe. Alternatively, if the center shaft terminates at the end of the center portion, air flowing from the center shaft may combine with air flowing around the center shaft at the outlet. The central axial tube preferably has a constant diameter. The central axial tube is preferably configured such that the air flowing through the central axial tube flows in a laminar flow.

The Venturi element may include an impeller at or downstream of the outlet. The impeller can create a pleasant mouth filling in the user's mouth. The impeller may have 2 to 6 blades, preferably 3 blades. The pitch of the impeller may be from 1 mm to 10 mm, preferably about 6 mm. The impeller pitch can be defined as the displacement that the impeller makes during a full 360° rotation in a hypothetical solid material. The impeller may be integrally formed with the Venturi element. The impeller may be provided as a separate element connected to the Venturi element. The outlet may include attachment means for attaching the impeller to the outlet. The fastening means may be provided by a groove for the nut. The impeller may be attached to the outlet by means of a locking connection. The impeller may be made of the same material as the Venturi element. The central axis of the impeller can be aligned along the longitudinal axis of the Venturi element.

The impeller can be combined with a central axial tube as described above. In this embodiment, the central axial tube preferably starts in the central part when viewed from the upstream direction towards the downstream direction. The central shaft preferably extends all the way to the ends of the outlet so that air flowing through the central shaft can exit the central shaft directly into the user's mouth. In this embodiment, the impeller may be located around the central axial tube, preferably adjacent to the downstream end of the outlet portion. The impeller can optimize the flow of air, which is the air flowing around the central axial tube. The impeller can be made stationary or freely rotating.

The Venturi element may include a vent. The vent may be located on one or more of the inlet part, the central part and the outlet part. More than one vent may be provided. The vent can create a fluid connection between the outside of the venturi element and the corresponding part of the venturi element on which the vent is located. Preferably, the vent is located in the central part. This arrangement may have the advantage that air is drawn from the outside of the venturi element into a central portion where the air can be mixed with the air flow through the venturi element. Air can be drawn from the outside of the venturi into the center because the air pressure in the center can be lower than the air pressure outside the venturi due to the venturi effect. The mixture of outside air with air flow along the longitudinal axis of the Venturi element can create an optimized aerosol.

The venturi element may include a second air flow channel parallel to the first air flow channel. The venturi element may include a second inlet part, a second central part and a second outlet part. The second inlet portion may be configured to converge towards the second central portion, and the second outlet portion may be configured to diverge from the second central portion.

The second inlet part, the second central part and the second outlet part may form a second air flow path. The second air flow channel may be arranged parallel to the first air flow channel. The first and second air flow channels may be arranged parallel to the longitudinal axis of the Venturi element. Air flowing through the first air flow passage may be combined with air flowing through the second air flow passage at or downstream of the venturi element. The air entering the Venturi element may be divided between the first air flow channel and the second air flow channel. With regard to the dimensions of the second air flow channel, the second air flow channel may be similar to the first air flow channel as described above, but in a mirror image configuration. In other words, the second air flow path may be in the form of a reversed first air flow path. If the aerosol-generating article contains a non-liquid aerosol-generating substrate, the inlet portion of the second air flow passage may converge towards the central portion of the second air flow passage at an inlet angle of 2° to 10°, preferably 4° to 8° , more preferably 6°. The axial length of the inlet part may be from 14 mm to 35 mm, preferably from 19 mm to 28 mm, more preferably 23 mm. The axial length of the central portion may be 2 mm to 5 mm, preferably 3 mm to 4 mm, more preferably 3.2 mm. The central portion of the second air flow passage may have an axial length of approximately 1.6 mm. The outlet of the second air flow channel may be radiated from the central part of the Venturi element at an outlet angle of 16° to 20°, preferably 17° to 19°, more preferably 18°. The axial length of the outlet portion may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm.

If the aerosol-generating article contains an aerosol-forming liquid substrate, the inlet portion of the second air flow passage may converge towards the central portion of the second air flow passage at an inlet angle of 16° to 20°, preferably 17° to 19° , more preferably 18°. The outlet of the second air flow channel may be radiated from the central part of the Venturi element at an outlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°.

The axial length of the inlet part may be 3 mm to 10 mm, preferably 5 mm to 9 mm, more preferably 7.7 mm. The axial length of the central portion may be 2 mm to 5 mm, preferably 3 mm to 4 mm, more preferably 3.2 mm. The central portion of the second air flow passage may have an axial length of approximately 1.6 mm. The axial length of the outlet may be 14 mm to 35 mm, preferably 19 mm to 28 mm, more preferably 23 mm.

If two air flow passages are provided, a common upstream portion may be provided for dividing the air flow between the inlet portions of the first and second air flow passages. The common upstream portion may be located within the Venturi element. By providing two airflow channels, an optimized draw resistance (RTD) can be achieved. In some embodiments, the preferred optimized draw resistance of the Venturi element alone can be between 5 mmH2O. Art. up to 60 mm w.c. Art., preferably from 5 mm of water. Art. up to 30 mm w.c. Art., more preferably from 10 mm of water. Art. up to 15 mm w.c. Art. In some embodiments, the preferred optimized draw resistance of the venturi element along may be about 12 mmH2O. Art. In some embodiments, the optimized draw resistance of the device and consumable component together can be between 50 mmH2O. Art. up to 60 mm w.c. Art., preferably from 52 mm of water. Art. up to 56 mm w.c. Art. A greater degree of filling of the oral cavity can be influenced by the provision of two channels for air flow. The organoleptic feel and delivery profile of the feel of use can be adjusted by adjusting the design of the two airflow channels.

The present invention further relates to a set of Venturi elements for use in an aerosol generating system as described herein. Each Venturi element is releasably attachable to one or both of the aerosol generating article described herein and the aerosol generating device described herein. Each of the Venturi elements is made with different characteristics.

Different characteristics can be realized through the structural configuration of the Venturi elements. Each of the Venturi elements of the set of Venturi elements may be configured as described herein, in particular with an inlet, a central portion and an outlet as described herein.

The term "characteristics" may mean one or more of the physical properties of the venturi element and the mechanical properties of the venturi element. Physical properties can be velocity or pressure. Different speeds or pressures, preferably a change in pressure, can contribute to different aerosol flows and different spatial distances of the vapor path. The mechanical properties may be the size, material and/or design of the venturi element. The different dimensions of the Venturi element may be due to different lengths of one or more of the inlet, center, and outlet. Different dimensions of the Venturi element may be due to different angles of one or more of the inlet portions and outlet portions. The different characteristics may be due to the different air flow path configurations of the individual venturi elements, preferably the inlet and outlet portions, more preferably the inlet and outlet angles. Different materials of Venturi elements can have different coefficients of friction. An excellent coefficient of friction can contribute to different aerosol flow rates. Various designs of venturi elements may be a double venturi element, or an impeller within a venturi element, or one of the designs described herein.

Different characteristics of the Venturi element can contribute to different ways of generating aerosol. Characteristics can determine the feel of use. The outlet angles of each of the Venturi elements may differ by at least 0.5°, preferably by at least 1°, more preferably by at least 2°, most preferably by 2°. In this case, the set of Venturi elements may be configured for use with one or more aerosol generating articles containing an aerosol generating substrate, preferably a non-liquid aerosol generating substrate.

The entry angles of each of the Venturi elements may differ by at least 0.5°, preferably by at least 1°, more preferably by at least 2°, most preferably by 2°. In this case, the set of Venturi elements may be configured for use with one or more aerosol generating articles containing an aerosol generating substrate, preferably a liquid aerosol generating substrate.

In some embodiments, the set of Venturi elements may be configured for use with various aerosol generating substrates. For example, one or more of the Venturi elements in the kit may be configured for use with an aerosol-forming liquid substrate, and the other one or more of the Venturi elements in the kit may be configured for use with a non-liquid aerosol-forming substrate.

One or more Venturi elements in a set may have one or more different options. One option is that the venturi element may contain threads on the outlet portion. An additional option is that the venturi element contains a central axial tube having a relatively smaller outer diameter than the diameter of the central part. Yet another option is that the venturi element comprises an impeller at or downstream of the outlet, or a venturi element vent. The Venturi element may include a second air flow passage parallel to the first air flow passage as an option. Therefore, the Venturi element may comprise a second inlet part, a second central part and a second outlet part, wherein the second inlet part can be made converging towards the second central part, and the second outlet part can be made diverging from the second central part.

In a set of venturi elements, at least one venturi element contains at least one of the above options, and at least one other venturi element contains at least one other of the above options.

For example, one Venturi element of the Venturi element set may comprise threads on the outlet portion, and another Venturi element of the Venturi element set may comprise an impeller at or downstream of the outlet portion.

Different options and different configurations, in particular different inlet and outlet angles, of the Venturi elements in the Venturi element set can result in different user experiences. The user can select his desired feel of use by selecting the appropriate venturi element from the set of venturi elements. The selected venturi element can then be attached by the user to the aerosol generating article. The venturi elements in the venturi element set can be labeled with different labels to suit the different feel of use. The marks may be tactile or optical marks. The tactile tag may be a tag with a particular surface structure. The optical label may be a colored label. The individual label may correspond to a particular user experience, such as a low user experience or a strong user experience. The tags can be provided with different colors, or different surface structures, or a combination of these to enable the tags to be identified.

A set of Venturi elements may be contained in a package containing different Venturi elements. The package of venturi elements may contain a label as described above, for example a tactile tag or an optical label, to enable nested venturi elements to be identified.

The set of Venturi elements for aerosol-generating articles containing a non-liquid aerosol-forming substrate may differ from the set of Venturi elements for aerosol-generating articles containing a liquid aerosol-forming substrate. For example, Venturi elements for aerosol-generating articles containing a non-liquid aerosol-forming substrate may differ from Venturi elements for aerosol-generating articles containing a liquid aerosol-forming substrate due to different labels.

The present invention may further relate to a method for manufacturing a venturi element for use with an aerosol generating article comprising an aerosol generating substrate, the method comprising:

providing a Venturi element containing an air flow channel, wherein the air flow channel may comprise an inlet part, a central part and an outlet part, while the inlet part is made converging towards the central part, and the outlet part is made diverging from the central part. If the aerosol-generating article contains a non-liquid aerosol-generating substrate, the inlet portion may be configured to converge toward the central portion at an inlet angle of 16° to 20°, preferably 17° to 19°, more preferably 18°. If the aerosol-generating article contains an aerosol-forming liquid substrate, the inlet portion may be configured to converge toward the central portion at an inlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°.

The method may include the step of attaching the Venturi element to the aerosol generating article. If the aerosol generating article comprises a hollow filter portion, the method may include the step of inserting a Venturi element into the hollow filter portion of the aerosol generating article. The Venturi element may contain a connecting element. The method may include inserting a venturi element into a hollow filter portion of an aerosol generating article. The method may include providing any of the venturi element elements and configurations described above.

The features described in relation to one aspect can be equally applied to other aspects of the present invention.

The present invention will now be described solely by way of example with reference to the accompanying drawings, in which:

in fig. 1 shows a system comprising an aerosol generating article and a venturi element in which the aerosol generating article and the venturi element are permanently attached to each other;

in fig. 2 shows an embodiment in which the aerosol generating article and the Venturi element are detachable by means of a connecting portion of the aerosol generating article and the connecting element of the Venturi element;

in fig. 3 shows a sectional view of the Venturi element;

in fig. 4 shows an aerosol generating device comprising a mouthpiece with a venturi element;

in fig. 5 is an exploded view of the aerosol generating device of FIG. four;

in fig. 6 shows an embodiment of a venturi element with threads in the outlet;

in fig. 7 shows two embodiments of a venturi element with a central axial tube;

in fig. 8 shows various views of an embodiment of an impeller venturi element;

in fig. 9 shows an embodiment of a venturi element with a combination of a central axial tube and an impeller;

in fig. 10 shows various embodiments of a venturi element with a vent at various different locations along the venturi element;

in fig. 11 shows an embodiment of a venturi element with two airflow channels; and

in fig. 12 shows an embodiment of a venturi element with a central portion of negligible length.

In FIG. 1 shows an aerosol generating article 10 as well as a Venturi element 12. The aerosol generating article 10 comprises a substrate portion 14 as well as a filter portion 16. The filter portion 16 is preferably in the form of a hollow acetate tube. In FIG. 1 shows a venturi element 12 attached to an aerosol generating article 10. The Venturi element 12 in the embodiment shown in FIG. 1 is preferably permanently attached to the aerosol generating article 10, more specifically to the filter portion 16 of the aerosol generating article 10. An outer wrapper may be provided around the aerosol generating article 10 and the Venturi element 12.

In FIG. 2 shows an embodiment in which the venturi element 12 is releasably attachable to the aerosol generating article 10. The filtering part 16 of the aerosol-generating article 10 includes a connecting part 18 for connecting the Venturi element 12 to the aerosol-generating article 10. The connecting part 18 of the aerosol generating article 10 can also be a filter, preferably a hollow acetate tube. Alternatively, a connecting part 18 of the aerosol generating article 10 can be provided in addition to the filtering part 16. The filtering part 16 can be located between the substrate part 14 and the connecting part 18.

The Venturi element 12 shown in FIG. 2 includes a connector 20 for insertion into the connector 18 of the aerosol generating article 10. The connecting element 20 of the Venturi element 12 preferably has a tapered shape. The step 22 surrounds the outer perimeter of the connector 20. The tapered configuration of the connector 20 allows the connector 20 of the venturi element 12 to be easily inserted into the connector 18 of the aerosol generating article 10. The step 22 surrounding the outer perimeter of the connector 20 of the venturi element 12 is configured to securely hold the connector 20 inside the connector 18 of the aerosol generating article 10. The connecting part 18 of the aerosol generating article 10 is preferably hollow so that the connecting element 20 of the venturi element 12 can be easily inserted into the hollow connecting part 18. The upstream end 24 of the connecting element 20 of the venturi element 12 preferably has a smaller outer diameter than the inner diameter of the hollow connecting part 18 of the product 10 that generates the aerosol. The upstream end 24 of the connecting element 20 may be the upstream end 24 of the Venturi element 12. As can be seen in FIG. 2, the connecting element 20 of the venturi element 12 tapers in such a way that the outer diameter of the connecting element 20 of the venturi element 12 increases towards the downstream end. Preferably, the maximum outer diameter of the connector 20 of the Venturi element 12 is greater than the inner diameter of the hollow connector 18 of the aerosol generating article 10. Thus, the connecting element 20 of the Venturi element 12 is securely held inside the hollow connecting part 18 of the aerosol generating article 10 after inserting the connecting element 20 into the connecting part 18. Holding the connecting element 20 of the Venturi element 12 is further facilitated by the step 22. The inner wall of the hollow connecting element parts 18 of aerosol generating article 10 may contain elements not shown in FIG. 2, which can be engaged with the step 22 of the connecting element 20 of the Venturi element 12.

In FIG. 3 shows a sectional view of the Venturi element 12. The venturi element 12 comprises an inlet 26, a central portion 28 and an outlet 30. The inlet 26 tapers towards the central portion 28. In FIG. 3, the inlet portion 26 has a conical shape. The inside diameter of the inlet portion 26 decreases from the upstream end of the venturi element towards the downstream end of the venturi element. The central part 28 forms a constricted air flow passage for the air flowing through the Venturi element 12 . The axial length L _central of the central part 28 may be from 2 mm to 5 mm, preferably 3.2 mm. The central part 28 has a constant inner diameter, preferably 2 mm. The outlet 30 is located downstream of the central portion 28. The outlet 30 diverges from the central portion 28 towards the downstream end 32 of the Venturi element 12. Outlet 30 also has a conical shape, but is oriented in the opposite direction compared to inlet 26.

If the aerosol-generating article contains an aerosol-generating substrate, preferably a non-liquid aerosol-generating substrate, the inlet angle α of the inlet portion 26 may be from 16° to 20°, preferably from 17° to 19°, more preferably 18°. The inlet angle is the angle between the longitudinal axis of the inlet portion and the inner wall of the inlet portion. The axial length L _inlet of the inlet part 26 may be between 3 mm and 10 mm, preferably 7.7 mm.

The outlet portion 30 may have an outlet angle θ of 2° to 10°, preferably 4° to 8°, more preferably 6°. The outlet angle is the angle between the longitudinal axis of the outlet and the inner wall of the outlet. The axial length L _outlet of the outlet part 30 may be from 14 mm to 35 mm, preferably 23 mm. The maximum inner diameter of the outlet 30 at the downstream end 32 is, for example, 6 mm.

If the aerosol-generating article contains an aerosol-forming liquid substrate, the dimensions and angles of the Venturi element are different from the case where the aerosol-generating article contains a non-liquid aerosol-forming substrate. Preferably, the inlet angle α of the inlet part 26 may in this case be from 2° to 10°, preferably from 4° to 8°, more preferably 6°. The axial length L _inlet of the inlet part 26 may be between 14 mm and 35 mm, preferably 23 mm. The maximum inner diameter of the inlet part 26 may be 3 mm, for example. The maximum inner diameter of the outlet 30 at the downstream end 32 may, for example, be 3 mm. The outlet angle θ is between 16° and 20°, preferably 18°. The axial length L _outlet of the outlet part 30 may be from 3 mm to 10 mm, preferably 7.7 mm.

The inlet portion 26, the central portion 28 and the outlet portion 30 together form a channel for air flow in the venturi element 12 from the upstream end 24 of the venturi element 12 towards the downstream end 32 of the venturi element 12. The downstream end 32 of the venturi element 12 is configured such that a user can grasp the downstream end 32 of the venturi element 12 between their lips to inhale the aerosol formed at the outlet portion 30 of the venturi element 12. The venturi element may have an outer shape adapted to hold the downstream end 32 of the venturi element 12 between the user's lips, such as an ergonomic shape for comfort. The air containing the vaporized aerosol-generating substrate from the aerosol-generating article 10 can flow into the inlet portion 26 of the Venturi element 12. This air is then compressed in the central portion 28, thereby reducing the pressure and increasing the air velocity. As air is drawn out of the central portion 28 and into the outlet portion 30, the air expands and cools so that optimized droplets can form in the aerosol. The aerosol may then be inhaled by the user.

In FIG. 4 shows an aerosol generating device into which a Venturi element 12 can be incorporated. Preferably, the Venturi element 12 may be part of the mouthpiece 34 of the aerosol generating device. The aerosol generating device includes additional elements such as a heating chamber 36 in or around which a heating element may be provided. The heating element may be powered by the power supply unit 38 . The supply of electrical energy from the power supply 38 to the heating element can be controlled by the electrical circuit 40.

In FIG. 5 shows the aerosol generating device of FIG. 4 in exploded view. It is shown that the Venturi element 12 is located along the longitudinal axis of the aerosol generating device. The aerosol generating device may comprise two main parts: a mouthpiece 34 and a main body 42 of the aerosol generating device. The mouthpiece 34 may include a venturi element 12, while the main body 42 may contain additional elements such as a power supply 38 and an electrical circuit 40. The heating chamber 36 may be partially formed in the mouthpiece 34 and the main body 42, or in each of one of these main parts. The mouthpiece 34 and the main body 42 may be detachable from each other. In the detached state, the aerosol generating article 10 may be inserted into the heating chamber 36. The mouthpiece 34 may be attached to the main body 42 such that the aerosol generating article 10 is surrounded or at least partially surrounded or enclosed in the heating chamber 36 by the mouthpiece. 34 and the main body 42. The venturi element 12 can then be positioned further downstream of the aerosol generating article 10. The main body 42 of the aerosol generating device may include one or more air inlets 44 that allow ambient air to enter the aerosol generating device. The air inlet 44 can be best seen in FIG. 4. Air can flow through one or more air inlets 44 into a heating chamber 36 in which the air as well as the aerosol generating substrate contained in the aerosol generating article 10 is heated. The vaporized aerosol-forming substrate may be entrained by air flowing through the heating chamber 36. Subsequently, the air containing the vaporized aerosol-forming substrate flows through the Venturi element 12. The aerosol can then be inhaled by the user downstream of the Venturi element 12.

In FIG. 6 shows an embodiment of the venturi element 12 in which the outlet portion 30 of the venturi element 12 has threads 46 . The threads 46 are preferably in the form of screw threads 46 . The pitch 48 of the threads 46 is indicated in FIG. 6 and is preferably about 5 mm. The threads 46 create a swirling airflow at the outlet 30 as indicated at the bottom of FIG. 6. This can provide a pleasant user experience for the user inhaling the swirling stream of aerosol at the downstream end 32 of the venturi element 12.

In FIG. 7 shows an embodiment in which a central axial tube 50 is provided along the longitudinal axis of the Venturi element 12. The central axial tube 50 provides a second path for air flow. Air flows in a laminar flow towards the user's mouth through the central axis tube 50. In addition to this central airflow through the central axis tube 50, air can flow around the central axis tube 50 to generate an aerosol. The air flowing around the central axial tube 50 may flow in a turbulent flow. The air flowing around the central axial tube 50 flows through the narrowed part of the central part 28 and into the outlet part 30, in which the air can expand. Thus, optimized droplets can be generated at the outlet 30 around the central axial tube 50 and combine with the aerosol flowing through the central axial tube 50 downstream of the venturi element 12 into the user's mouth. This arrangement can result in a pleasant sensory experience for the user. At the top of Fig. 7 shows an embodiment in which the central axial tube 50 extends the entire length of the venturi element 12. At the bottom of Fig. 7 shows an embodiment in which the central axial tube 50 passes through the inlet portion 26 as well as the central portion 28 of the venturi element 12, and not through the outlet portion 30. In another embodiment, which is not illustrated, the central axial tube 50 can only pass through the outlet 30. In another embodiment, the central axial tube 50 may pass only through the central portion 28 and the outlet 30, but not through the inlet 26.

In FIG. 8 shows a configuration in which the impeller 52 is provided in the outlet portion 30 of the venturi element 12. The impeller 52 creates a swirling aerosol air flow further downstream of the venturi element 12 into the user's mouth. Therefore, the impeller 52 is adjacent to the downstream end 32 of the Venturi element 12. The impeller 52 may contain several blades. Embodiments with three or four blades are shown at the bottom of FIG. 8. A three vane configuration is particularly preferred, however it will be appreciated that more than three or even more than four vanes may be used within the scope of the present invention.

In FIG. 9 shows an embodiment in which the embodiments of FIG. 7 and 8. In more detail, a central axial tube 50 is provided with an impeller 52 surrounding the central axial tube 50. The impeller 52 is located adjacent to the downstream end 32 of the venturi element 12. Optimized droplets are created around the central axial tube 50 and the outlet 30 of the venturi element 12, and the aerosol airflow is further optimized by the impeller 52. This airflow combines with the air flowing from the central axial tube 50 into the user's mouth to provide a pleasant feeling of use.

In FIG. 10 shows an embodiment in which an air vent 54 is provided. At the top of FIG. 10 shows an embodiment in which the vent 54 is provided in the inlet portion 26 of the venturi element 12. In all embodiments shown in FIG. 10, the vent 54 allows air from the outside of the venturi element 12 to flow into the air flow path through the venturi element 12. In the middle part of Fig. 10 shows an embodiment in which the vent 54 is located in the central portion 28, while in the lower portion of FIG. 10 shows an embodiment in which the vent 54 is located in the outlet portion 30 of the venturi element 12. In the middle part of Fig. 10 shows the preferred embodiment because the air pressure in the central portion 28 of the venturi element 12 decreases as air flows through the venturi element 12. In this regard, the Venturi effect leads to reduced pressure and increased speed in the central part 28 of the Venturi element 12, since this central part 28 is a narrowed passage for the air flow compared to the inlet part 26 and the outlet part 30 of the Venturi element 12. Thus, air can be sucked in from the outside of the venturi element 12 through the vent 54 into the central portion 28. This outside air can then be combined with air flowing through the venturi element 12 from the upstream end 24 of the venturi element 12 towards the further along the flow of the end 32 of the Venturi element 12. This can lead to a pleasant feeling of use.

In FIG. 11 shows an embodiment of a venturi element 12 with two airflow channels. The airflow channel shown on the right side of the embodiment shown in FIG. 11 substantially corresponds to the airflow passage described above with respect to the Venturi element 12 used in conjunction with an aerosol generating article containing an aerosol generating substrate, preferably a non-liquid aerosol generating substrate. In this air flow passage, the inlet portion 26 is relatively short compared to the outlet portion 30. In this air flow passage, the inlet angle α is relatively larger than the outlet angle θ. In addition to this air flow path, the second air flow path provided to the left of the first air flow path in the embodiment shown in FIG. 11 has a mirror image configuration. This means that the second air flow channel essentially corresponds to the first air flow channel if the first air flow channel is located in the opposite direction. In this reversed airflow path, the outlet portion 30 is relatively short compared to the inlet portion 36. In this reversed airflow path, the inlet angle α is relatively smaller than the outlet angle θ. The airflow channel shown on the left side of the embodiment shown in FIG. 11 substantially corresponds to the airflow passage described above with respect to the Venturi element 12 used in conjunction with an aerosol generating article containing an aerosol generating liquid substrate. In this air flow passage, the inlet portion 26 is relatively large compared to the outlet portion 30. In this air flow passage, the inlet angle α is relatively smaller than the outlet angle θ. In addition to this air flow path, the second air flow path provided to the right of the first air flow path in the embodiment shown in FIG. 11 has a mirror image configuration. This means that the second air flow channel essentially corresponds to the first air flow channel if the first air flow channel is located in the opposite direction. In this reversed airflow path, the outlet portion 30 is relatively large compared to the inlet portion 36. In this reversed airflow path, the inlet angle α is relatively larger than the outlet angle θ. This arrangement of airflow channels can provide an optimized feel of use, since two airflow channels can provide a slightly different feel. One of the airflow channels may provide a soft feeling of use, while the other airflow channel may create a blowout or stronger delivery profile. In combination, the desired delivery profile can be combined with a soft feel of use. To distribute air between the first air flow channel and the second air flow channel, a common upstream portion 56 may be provided in the Venturi element 12.

In FIG. 12 shows a preferred embodiment, in which the central part 28 is made as a transition between the inlet part 26 and the outlet part 30. The central part 28 according to the embodiment shown in FIG. 12 is a constricted air flow passage and thus results in a venturi effect when air flows from inlet 26 to outlet 28.

Claims (53)

1. An aerosol generating system, comprising: an aerosol-forming substrate; and venturi element, wherein the Venturi element contains a channel for air flow, while the channel for air flow contains an inlet part, a central part and an outlet part, while the inlet part is made converging in the direction of the central part, and the outlet part is made diverging from the central part, and at the same time: the inlet part is made converging towards the central part at an inlet angle ranging from 1° to 19°. 2. An aerosol generating system according to claim 1, comprising: an aerosol generating article comprising said aerosol-forming substrate. 3. An aerosol generating system according to claim 2, wherein the aerosol generating article comprises said Venturi element. 4. The aerosol generating system of claim 2, wherein said venturi element is releasably attachable to the aerosol generating article. 5. The system for generating an aerosol according to claim 4, in which the product for generating aerosol contains a connecting part, while the specified Venturi element contains an air flow channel containing an inlet part, while the inlet part of the specified Venturi element contains a connecting element, while the connecting the aerosol generating part of the product is configured to receive in a detachable manner the connecting element of said Venturi element. 6. The aerosol generating system according to claim 5, wherein the connecting part of the aerosol generating article has a tubular shape, configured to insert a connecting element of said Venturi element into it. 7. An aerosol generating system according to claim 5 or 6, wherein the connector of said venturi element comprises mechanical holding means configured to hold the connector of said venturi element within the connector of the aerosol generating article. 8. An aerosol generating system according to any one of the preceding claims, wherein said Venturi element is in the form of a mouthpiece. 9. System for generating an aerosol according to any one of paragraphs. 2-8, wherein the aerosol generating article is in the form of a rod and the wrapping material is positioned to wrap the aerosol generating article. 10. System for generating an aerosol according to any one of paragraphs. 1-9, in which the inlet part is made converging towards the central part at an inlet angle of 16° to 19°, preferably 17° to 19°, more preferably 18°. 11. System for generating an aerosol according to any one of paragraphs. 1-10, in which the outlet part diverges from the central part at an outlet angle of 2° to 10°, preferably 4° to 8°, more preferably 6°. 12. System for generating an aerosol according to any one of paragraphs. 1-11, in which one or more of the following conditions are met: the axial length of the inlet is 3 to 10 mm, preferably 5 to 9 mm, more preferably 7.7 mm; the axial length of the outlet part is 14 to 35 mm, preferably 19 to 28 mm, more preferably 23 mm; the axial length of the central part is 2 to 5 mm, preferably 3 to 4 mm, more preferably 3.2 mm; the inner diameter of the central part is 0.5 to 1.5 mm, preferably 0.8 to 1.2 mm, more preferably 1 mm. 13. An aerosol generating system according to any one of the preceding claims, wherein said aerosol-forming substrate comprises a non-liquid aerosol-forming substrate. 14. The aerosol generating system of claim 13, wherein the non-liquid aerosol-forming substrate is an electrically heated tobacco product (EHTP), preferably containing reconstituted tobacco, more preferably a shaped sheet. 15. System for generating an aerosol according to any one of paragraphs. 1-9, 13, 14, in which: the inlet part is made converging towards the central part at an inlet angle of 2° to 10°. 16. System for generating an aerosol according to any one of paragraphs. 1-9 and 15, wherein said aerosol-forming substrate is a liquid aerosol-forming substrate. 17. System for generating an aerosol according to any one of paragraphs. 15 or 16, in which the inlet part is made converging towards the central part at an inlet angle of 4° to 8°, more preferably 6°. 18. System for generating an aerosol according to any one of paragraphs. 15-17, wherein the outlet part diverges from the central part at an outlet angle of 10° to 20°, preferably 16° to 20°, preferably 17° to 19°, more preferably 18°. 19. System for generating an aerosol according to any one of paragraphs. 15-18, in which one or more of the following conditions are met: the axial length of the inlet part is 14 to 35 mm, preferably 19 to 28 mm, more preferably 23 mm; the axial length of the outlet portion is 3 to 10 mm, preferably 5 to 9 mm, more preferably 7.7 mm; the axial length of the central part is 2 to 5 mm, preferably 3 to 4 mm, more preferably 3.2 mm; the inner diameter of the central part is 0.5 to 5 mm, preferably 0.8 to 1.2 mm, more preferably 1 mm. 20. System for generating an aerosol according to any one of paragraphs. 1-19, in which one or more of the following conditions are met: the outlet part contains threads; said Venturi element further comprises a central axial tube having a relatively smaller outer diameter than the diameter of the central portion; the specified element Venturi contains the impeller in the outlet part or downstream relative to it; the specified element of the Venturi contains a vent; and Said Venturi element comprises a second air flow channel parallel to the first air flow channel, wherein the second air flow channel comprises a second inlet part, a second central part and a second outlet part, the second inlet part being made converging towards the second central part, and the second outlet part is made diverging from the second central part, and preferably each of the central part of the first air flow channel and the second central part has a length of 1.6 mm. 21. An aerosol generating system according to any one of the preceding claims, comprising an aerosol generating device, comprising a cavity for receiving said aerosol-forming substrate, wherein the aerosol generating device is configured to heat the contained said aerosol-forming substrate to a temperature at which one or more volatile compounds are released from said aerosol-forming substrate without igniting said aerosol-forming substrate. 22. The aerosol generating system of claim 21, wherein the device comprises a heating element, the heating element being positioned to at least partially penetrate the interior of said aerosol-generating substrate. 23. An aerosol generating system according to claim 21 or 22, comprising a heating element, wherein the heating element is configured to heat at least an outer surface of said aerosol-forming substrate or an article containing said aerosol-forming substrate. 24. System for generating an aerosol according to any one of paragraphs. 21-23, wherein said Venturi element is part of an aerosol generating device. 25. An aerosol generating system comprising a set of venturi elements for use with the aerosol generating system according to any one of the preceding claims, wherein the set comprises at least one venturi element and at least one different venturi element, each venturi element being with the possibility of attaching in a releasable way to one or both of: articles for generating an aerosol containing an aerosol-forming substrate; and aerosol generating devices, wherein each of the Venturi elements is made with characteristics differing from each other, being one or both of the physical properties and mechanical properties of the Venturi element, wherein each Venturi element is made with different characteristics due to different outlet angles, while the outlet angles of each of the Venturi elements differ by at least 0.5°, preferably by at least 1°, more preferably by at least 2°, most preferably by 2°, and/or each venturi element has different characteristics due to different inlet angles , wherein the inlet angles of each of the Venturi elements differ by at least 0.5°, preferably by at least 1°, more preferably by at least 2°, most preferably by 2°. 26. The system for generating an aerosol according to claim 25, characterized in that one or more Venturi elements contain at least one of the following options: threads on the outlet part; a central axial tube having a relatively smaller outer diameter than the diameter of the central portion; an impeller at or downstream of the outlet; ventilation hole; and a second air flow channel parallel to the first air flow channel, wherein the Venturi element comprises a second inlet part, a second central part and a second outlet part, wherein the second inlet part is made converging towards the second central part, and the second outlet part is made diverging from the second central part.

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