WO2019215347A1

WO2019215347A1 - Device for smoking a smokeable material

Info

Publication number: WO2019215347A1
Application number: PCT/EP2019/062239
Authority: WO
Inventors: Sarkis SARIAN
Original assignee: Aries
Priority date: 2018-05-11
Filing date: 2019-05-13
Publication date: 2019-11-14
Also published as: US20210106049A1; MA52572A; EP3790417A1

Abstract

Capsule (3) having a wall defining a space (33) inside the capsule which contains a volume of smokeable material (2), the wall of the capsule comprising a tank (34) having a bottom and an annular peripheral wall of the tank, said annular peripheral wall defining an upper opening (34a) of the tank (34), a lid (35) closing the upper opening (34a) of the tank (34), the volume of smokeable material (2) being placed in the tank, against the bottom of the tank, and defining a high level (HL) of smokeable material in the capsule, said high level (HL) being at a distance from said lid (35). The bottom of the tank (34) has a central region (Zc) extending above the volume of smokeable material and above a high level (HL) of smokeable material.

Description

DEVICE FOR SMOKING FUMABLE MATERIAL

BACKGROUND OF THE INVENTION

The present invention relates to the general field of devices for smoking a smokable material.

Such devices are for example known as the water pipe or shisha.

In general, a device for smoking a smokable material comprises an upper bowl having a recess for positioning smokable material and a chimney open towards the interior of this upper bowl for collecting smoke generated by combustion of said smokable material.

Traditionally, manual filling of an upper bowl with smokable material, for example tobacco or a mixture of tobacco and syrup is performed manually. This filling is not easy because it is necessary to adjust the amount of smokable material in the bowl while ensuring that the material is properly positioned / ventilated to allow good combustion.

It should be noted that the amount of smokable material may vary depending on the taste of the user and the number of users desiring to smoke with the device.

For example, when the smokable material is molasses, i.e. a mixture of tobacco and syrup, about 20 grams per user is required.

Adjusting the right amount of molasses is not easy because this molasses is sticky.

Moreover, the smokable material is generally packaged in the form of a package containing a volume of smokable material corresponding to several individual doses. As soon as this package is started, it is necessary to quickly use the entire smokable material of the package on pain of seeing it dry and lose its fragrance.

To remedy some of these drawbacks, the patent document WO2015097424A1 proposes to condition the smokable material in a prefabricated capsule intended to be placed in a chamber receiving the capsule, this chamber being under an incandescent fire.

This prefabricated capsule has an upper flat wall and a lower flat wall, these flat walls being perforated to allow the passage of air and smoke through the capsule while avoiding contact between the incandescent material of the fireplace and the material to smoking. Lids are glued on the capsule to hide these perforations and thus ensure preservation of the smokable product.

A disadvantage of this device of the prior art is that during its handling and use, smokable material can pass through the perforations of the capsule at the risk of causing contamination and clogging.

OBJECT OF THE INVENTION

An object of the present invention is to provide a device for smoking a smokable material to solve all or part of the aforementioned problems of the prior art.

SUMMARY OF THE INVENTION

To this end, according to a first aspect of the invention, there is provided a device for smoking a smokable material comprising an upper bowl having a recess for positioning smokable material and a chimney open to the inside of the upper bowl for collecting smoke generated by combustion of said smokable material, said upper bowl having, inside the recess, positioning surfaces arranged to be able to position a capsule inside the recess of said upper bowl, this capsule containing said smokable material.

The device according to the invention is essentially characterized in that the device for smoking comprises a perforator adapted to produce at least a first opening of hot air circulation through a wall of the capsule while the capsule is positioned in the recess of the upper bowl and bears against said positioning surfaces.

This first hot air circulation opening is preferably connected to the chimney by a tubular portion extending from the wall of the capsule and to the chimney where this tube is preferably connected to sealing.

By making the first hot air circulation opening with the aid of a perforator belonging to the device and while the capsule is positioned in the recess of the upper bowl, a standardized perforation quality is obtained both in terms of the positioning of the perforation in terms of perforation dimensions while limiting the risk of smokable material spilling out of the upper bowl (for example during handling of the capsule).

Thus, the device according to the invention facilitates the introduction of the smokable material.

Moreover, after use, the user can remove the capsule with the smoked material it contains which facilitates the cleaning of the device.

Another advantage of the device according to the invention is that the perforations made through the capsule remain homogeneous from one capsule to another.

The need for training the user is reduced because he no longer needs to learn to measure, ventilate the smokable material and no longer need to learn to distribute the perforations in the wall of the capsule. The combustion characteristics are thus homogenized.

According to a second aspect, the invention relates to an assembly comprising:

a device according to any one of the embodiments of the device presented in the present description; and

a capsule having a wall delimiting a space inside the capsule containing a volume of smokable material, this capsule being placed inside the recess of said upper bowl and bearing against said positioning surfaces, the perforator passing through of this wall of the capsule and defining at least a first opening for hot air circulation through the wall of the capsule.

In a preferred embodiment of the assembly according to the invention, the perforator passes through the wall of the capsule and makes therein, in addition to said at least one first hot air circulation opening, at least one second opening. hot air circulation, said at least one first hot air circulation opening and said at least one second hot air circulation opening being separate from each other and being away from one another. other so as to form a baffle inside the capsule.

The baffle inside the capsule promotes a homogeneous mixture between the fumes generated by the combustion of the smoking material and the hot air admitted into the capsule.

According to this preferred embodiment of the assembly according to the invention, it is also possible for the capsule wall to comprise: - A bowl having a bottom and an annular peripheral wall of the bowl, said annular peripheral bowl wall defining an upper opening of the bowl;

a lid closing the upper opening of the bowl;

- The volume of smokable material being placed in the bowl against the bottom of the bowl by defining a high level of smokable material in the capsule, the high level being at a distance from said lid;

said first hot air circulation opening being a smoke outlet opening formed through the wall of the capsule, above said high level of smokable material in the capsule; and

said second hot air circulation opening being an air inlet opening in the capsule formed through the wall of the capsule, above the high level of smokable material in the capsule.

Having these first and second air openings made through the wall of the capsule and above the high level of smokable material keeps this material away from the openings to prevent it does not escape out of the perforated capsule.

The cover that extends through the upper opening to close it is a preferred area of perforation. For this purpose, the lid is preferably made of a material that is less resistant to perforation / punching than is the material constituting the bowl. For this purpose, the operculum is preferably formed of a material whose thickness is less than the thickness of the constituent material of the bowl.

For example, the lid and the bowl are essentially made of aluminum. Thus, the lid may be an aluminum foil less than 0.2 mm thick while the aluminum bowl is thicker than 0.3 mm.

Preferably, the periphery of the cap is sealingly attached along a peripheral edge of the upper opening of the bowl, for example via crimping, gluing, soldering or brazing or other sealing means. . The constituent material of the capsule is preferably food grade.

To this end, a food protection varnish can be applied inside the capsule so that the smoking material is in contact only with a varnished surface. This varnish can also be used to glue the lid to the rim of the bowl. According to a third aspect, the invention relates to a capsule having a wall delimiting a space inside the capsule containing a volume of smokable material, the wall of the capsule comprising:

- A bowl having a bottom and an annular peripheral wall of the bowl, said annular peripheral wall defining an upper opening of the bowl;

a lid closing the upper opening of the bowl;

- The volume of smokable material being placed in the bowl, against the bottom of the bowl and defining a high level of smokable material in the capsule, the high level being at a distance from said lid. This capsule is characterized in that the bottom of the bowl has a central zone rising above the volume of smokable material and above said high level of smokable material.

The first opening can thus be formed through this central zone of the bottom of the bowl while being above the high level of the volume of smokable material contained in the capsule.

Thanks to this central zone of the bottom of the bowl placed above the high level of the volume of smokable material, it is possible to evacuate hot air and smoke via a first opening for the circulation of hot air passing through the bottom of the capsule. and this without risk of closing this first opening.

Once the capsule wall is perforated by this first opening, the smokable material can be combusted to generate smoke evacuating via this first circulation opening, this smokable material remaining in the capsule, at a distance from this first opening.

This limits the risk of soiling the chimney with smokable material.

Moreover, by virtue of this central zone which makes it possible to locate a first opening for the circulation of hot air in a central zone of the capsule, the air can pass in the capsule, radially, towards this first central opening.

This air moves along and above the high level of the volume of smokable material from the periphery of the capsule to the central area of the bottom where is the first opening.

This circulation of air contributes to obtaining a homogeneous combustion of the smokable material while limiting the migration of this smokable material out of the capsule. According to a fourth aspect, the invention relates to a method of using a device for smoking a smokable material according to any of the embodiments of the device of the invention described in the present description.

This method of use comprises:

the introduction of a capsule inside the recess of said upper bowl, this capsule having a wall delimiting a space internal to the capsule, this internal space containing a volume of smokable material, this wall of the capsule being in abutment against said positioning surfaces, the wall of the capsule comprising a bowl and a lid closing an upper opening of the bowl, the volume of smokable material being placed in this bowl, against the bottom of the bowl by defining a high level of a smokable material in the capsule, this high level being at a distance from said operculum; then

a flow of hot air is generated inside the capsule, a second hot air circulation opening to a first hot air circulation opening, these first and second hot air circulation openings; being made through the wall of the capsule above the high level of smokable material and being distant from each other.

This method has the advantage of the aforementioned assembly because it limits the risk of output of smokable material out of the capsule via said openings through the capsule wall.

Preferably, according to this method according to the invention, after the introduction of the capsule inside the recess of said upper bowl, the method comprises the production of said first and second hot air circulation openings, these first and second second openings being made using a perforator forming a perforation cover, said perforation cover at least partially sealing a capsule insertion passage in said recess of the upper bowl, said passage being formed between an area external to said upper bowl and said recess of the upper bowl.

This is advantageous because the capsule remains sealed until the introduction of the perforation cover which closes the passage to the recess of the upper bowl where the capsule is. The flavors of the smokable material are thus preserved until the moment of consumption by the user.

Preferably, according to this method according to the invention, the perforation lid comprises at least one tube provided with a cutting edge formed at a first end end of this tube and adapted to perforate the capsule wall, said first opening of circulation hot air being created by depressing the tube through the wall of the capsule. This tube opens out of the capsule and perforated vis-à-vis the chimney to allow the circulation of a hot air flow between the tube and the chimney, a lateral perforation of this tube being then located inside. of the capsule, above said high level of smokable material and each at least a second opening being formed through the cap of the capsule, by a cutting shape carried by the same perforation cover.

This tube is thus shaped to allow a circulation of hot air inside the tube, between said lateral perforation which is in the capsule (positioned in the recess of the upper bowl and in abutment with said positioning surfaces) and said first terminal end of the tube which is out of the capsule, opposite the smoke.

BRIEF DESCRIPTION OF THE DRAWINGS

Other characteristics and advantages of the invention will emerge clearly from the description which is given hereinafter, by way of indication and in no way limitative, with reference to the appended drawings, in which:

- Figure 1 shows a perspective view of an assembly according to the invention comprising the device according to the invention;

- Figure 2 shows a sectional view of an assembly according to the invention comprising a smoking device according to the invention and a capsule according to the invention containing a volume of smokable material;

- Figure 3 shows an exploded view of the assembly according to the invention;

- Figure 4 is a perspective view of a capsule according to the invention for use in the smoking device according to the invention;

FIG. 5 is a cross-sectional view of the capsule of FIG. 4 prior to its use / perforation;

FIG. 6 is a perspective view from above of the perforator forming a perforation cover, this cover is adapted to partially seal the recess in which the capsule is located, to perforate the capsule located in the recess and to define the chamber. heater for receiving a coal / embers or heating resistor;

FIG. 7 is a perspective view from below of the perforator of FIG. 6; Figure 8 is a perspective view illustrating the perforation cover and the non-perforated capsule;

FIG. 9 is a perspective view illustrating the perforation cover and the capsule while the capsule is perforated by this perforation cover;

- Figure 10 is a perspective view of the capsule after perforation of the central region of the bottom of the bowl and making perforations of the capsule lid.

DETAILED DESCRIPTION OF THE INVENTION

As indicated above, the invention relates to a device 1 for smoking a smokable material 2.

The smokable material 2 is here tobacco or a mixture of tobacco and syrup, this mixture being also called molasses.

As illustrated in FIGS. 1, 2 and 3, this device 1 comprises an upper bowl 10 having a recess 11 for positioning smokable material 2 and a chimney 12 open towards the inside of the upper bowl 10 to collect smoke generated by combustion of said smokable material 2.

As can be understood from Figure 1, this chimney

12 plunges into a vase at the bottom of which is a volume of liquid (here water) in which opens the end of the chimney 12.

If necessary, this chimney 12 can be in several dismountable parts.

A suction tube extends outside the vase, between a suction nozzle intended to be placed in the mouth by the user and a connection connecting the suction tube to the vase. This suction tube allows the user to suck air / smoke present in the vase, above the volume of liquid. By performing this aspiration, the user generates a vacuum in the vessel which forces a flow of air through the chimney 12 by going from the internal recess to the upper bowl 10 towards the interior of the vessel.

This allows to suck smoke from the combustion of the smokable material 2 into the vessel through the liquid which serves as a filter and means of cooling the hot air / smoke.

The fumes inhaled by the user thus have improved taste characteristics.

The upper bowl 10 comprises, inside the recess 11, positioning surfaces 110 arranged to be able to position / wedge, a capsule 3 inside the recess 11 of said upper bowl to prevent it from s 'moves there.

These positioning surfaces 110 are arranged to prohibit translations of the capsule in a plane perpendicular to a direction of insertion of the capsule into the 'obvious', and to form an axial stop of the capsule in this direction of insertion.

The support of the capsule 3 against said positioning surfaces 110 is here realized at the lower outer face of the capsule wall which is of complementary shape to the positioning surfaces 110.

The lower outer face of the capsule has a shape of revolution which when viewed in cross section in a plane containing the axis of revolution has a shape of W.

To allow a better distribution and combustion of the smoking material, the three vertices of this W-shaped are rounded, that is to say without sharp angles.

The recess 110 formed inside the upper bowl 10 is also a form of revolution complementary to the shape of the lower outer face of the capsule, only the central portion of this form of revolution of the recess has a passage into which the chimney 112 opens.

This capsule 3 contains said smokable material 2 which is molded in the capsule against the lower inner face of the capsule.

The smoking device comprises a perforator 4 adapted to produce at least a first hot air circulation opening 31 through a wall of the capsule 3 whereas this capsule 3 is positioned in the recess of the upper bowl 10 and is resting against said positioning surfaces 110.

More specifically, the perforator 4 comprises at least one tube 41 having a cutting edge 410 formed at a first end end of this tube 41, this cutting edge being adapted to make a perforation P1 in the capsule wall 3.

This tube 41 is thus arranged to create said first hot air circulation opening 31 through the wall of the capsule.

As illustrated in FIG. 2, this tube 41 opens out towards the chimney 12 to allow the circulation of a hot air flow F between the tube 41 and the chimney 12.

This tube 41 also comprises a lateral perforation 411 of the tube which opens inside said recess 11 shaped to receive said capsule 3, this tube being shaped to allow a circulation of hot air inside the tube, between said lateral perforation

411 and said first end end of the tube 41.

In this case, this lateral perforation 411 is shaped to open into the capsule 3 when it is positioned / wedged in the recess 11 of the upper bowl 10. The recess 11 of the upper bowl 10 extends between a low limit Lb and a high limit Lh being above said low limit. In other words, when using the smoking device, the upper limit Lh of the recess is placed above the low limit Lb of the recess.

The lateral perforation 411 of the tube is closer to the upper limit Lh of the recess than it is to the lower limit Lb of the recess.

This makes it possible to limit the risk of the lateral perforation 411 plunging into the smoking material when the capsule is in the recess and is perforated by the tube 41.

As illustrated in Figures 2 and 3, the perforator 4 comprises a perforation cover 43 having a first perforation portion 431 (see detail in Figure 7). This perforation cover 43 is arranged to at least partially seal a capsule insertion passage in said recess 11 of the upper bowl.

This passage is formed between an outer zone to said upper bowl 10 and said recess of the upper bowl to allow insertion of the capsule.

The lid 43 may be removably assembled to the upper bowl 10 to selectively disengage the capsule insertion passage.

Thus, the capsule is releasably positioned in the recess to be retrievable from this recess once the puncture cover is removed and the passage released.

This cover 43 is arranged so that when it is positioned to at least partially close the capsule insertion passage, then its first perforation portion 431 is oriented to be able to extend into the recess in order to be able to pass through the wall of the capsule 3 placed in the recess. This first perforation portion is thus arranged to define said at least one first hot air circulation opening 31 through the capsule wall.

The first perforation portion 431 is here formed by said tube 41, this tube has a closed second end end which is connected to the perforation cover 43. The first end end which carries the cutting edge 410 opens into the chimney 12 to form a tight connection between the stack 12 and the periphery of the first end of the tube 41.

This tight connection can be achieved by means of a choice of material of the chimney 12 and the tube 41 allowing a sealing by tube / chimney interlocking or by means of at least one joint extending between the chimney and the tube.

Thus, the tube 41 may be rigid while the chimney material may be flexible, such as heat-resistant silicone.

This perforation cover 43 is preferably made of a material having:

on the one hand a coefficient of thermal conductivity greater than 20 W-m-1-K-1 for a temperature of 20 ° C; and

- On the other hand a melting temperature above 450 ⁰ C.

The lid 43 can thus withstand the heat caused during the combustion of the smoking material while allowing, where appropriate to transfer heat to the smoking material in the capsule to activate its combustion.

Typically, the cover material may be selected from aluminum, mild steel, stainless steel, titanium, copper, brass, bronze and their alloys. To promote heat transfer from the lid to the capsule, the lid may have complementary shapes of the upper outer face of the capsule to bear against this upper face when the capsule is in the recess 11 and the lid closes the capsule insertion passage.

As illustrated in FIGS. 1, 2 and 3, the device also comprises a heating chamber 5, this heating chamber is separated from said recess 11 formed in the upper bowl 10 by said perforation lid 43.

Here, the heating chamber 5 is a volume defined by an outer peripheral wall. A first end of this chamber 5 is open towards the perforation cover 43.

A second end of this heating chamber is partially closed by a cover having adjustable section vents by moving a shutter of the cover (here the shutter is pivotally mounted and is moved by means of a gripping rod)

As illustrated in FIG. 3, fixing screws, here three fixing screws, are used to assemble the cover 43 against the edge of the outer peripheral wall delimiting the heating chamber 5.

This is useful for facilitating temperature conduction while allowing disassembly of the heating chamber 5.

As illustrated in FIGS. 2, 3, 8, 9, 10, the capsule 3 has a wall delimiting an internal space 33 to the capsule, this internal space containing a volume of smokable material 2.

This wall of the capsule is made up of:

- Of a bowl 34 having a bottom and an annular peripheral wall of the bowl, this wall annular device defining an upper opening 34a of the bowl 34; and

- A seal 35 closing the upper opening 34a of the bowl 34.

The volume of smokable material 2 is placed in the bowl, against the bottom of the bowl and defining a high level NH, substantially plane, of smokable material in the capsule.

This high level NH is at a distance from the cap 35.

The bottom of the bowl 34 has a central zone Zc which rises above the volume of smokable material 2 and above said high level NH of smokable material (this high level NH here takes the form of a flat disk).

The recess 11, the capsule 3 and the perforator 4 which here have the shape of a perforation cover 43 are shaped so that when the capsule is in the recess 11 and the perforator 4 at least partially closes the passage of the capsule towards the recess, then a first portion 41 of the perforator (here a tube 41) passes through the wall of the capsule in said central zone of the bottom of the bowl 34 to form said at least a first air circulation opening hot 31.

It can be seen that the perforator passes through the entire capsule by first perforating the lid 35 and then the central zone of the bottom of the bowl to have a first circulation opening 31 facing the stack 12.

The perforator 4 also passes through the wall of the capsule 3 to make there, at a distance from the first hot air circulation opening 31, at least a second hot air circulation opening 32 so as to form a baffle hot air circulation inside the capsule 3. For this purpose, as illustrated in FIGS.

8, 9, the perforation cover 4 comprises a second perforator portion 42 arranged to produce the said at least one second hot air circulation opening 32 when this capsule is positioned in the recess

11 and that the perforation cover 4 is positioned against the upper bowl 10 to at least partially seal the capsule insertion passage. Preferably, each second part of the perforator 42 arranged to make a second hot air circulation opening 32 has a face oriented towards the capsule which is a portion of a frustoconical surface.

Note that the face of the perforation cover 4 facing the heating chamber has heat conduction pads. The terminal ends of these pads extend to the same plane and together define a support plane of combustible material (here coal). It will be noted that each second part of the perforator 42 carries several of these pads.

The perforator 4 is arranged so that each of said at least one second hot air circulation opening 32 is an air inlet opening in the capsule and is formed through the lid 35 of the capsule 3, above the high level NH of the volume of smokable material in the capsule and at the periphery of this lid.

Thus, while said at least one first hot air circulation opening 31 is made at the central zone Zc of the bottom of the bowl 34, each at least one second hot air circulation opening 32 is formed in part. This creates an airflow baffle in the capsule which is exclusively placed above the high level NH of the volume of smokable material. More precisely, as illustrated in FIG. 10, after perforation of the cover 35 by the perforator 4, it can be seen that there are three second openings 32 that are distinct from each other and are distributed at 120 °.

Each of these openings 32 is made by cutting the lid along a cut line composed of a circular line extending at a fixed distance from a central point of the capsule and two rectilinear lines delimiting on both sides the circular line.

As illustrated in FIG. 10, the cutting line is open so that the cut-off portion (s) 35 (s) remain (are) attached (s) to the remainder of the seal at a connecting portion. formed between the circular line LC and the central point Pt of the capsule.

Each portion of operculum thus cut forms a flap dipping into the capsule from the center to the periphery of the capsule. Each flap thus formed by the creation of one of the second openings 32 makes it possible to form a baffle in the capsule 3. Each baffle limits the outlet of the smokable material out of the capsule via an opening 32 while participating in a good distribution of the hot air in the capsule. The operculum portion thus cut and forming a flap remains attached to the rest of the capsule and forms a protective shield of the perforator 4 preventing contact between the smokable material and the perforator 4.

In other words, the shape of the perforator is adapted to perform a cutout of the lid such that each portion of the lid thus cut forms a flap dipping into the capsule, each flap thus formed remaining attached to the rest of the capsule by a connecting part between this flap and the rest of the lid so as to prohibit contact between the fumable material and the portion or portions of the perforator 4 which are inside the capsule.

For this purpose, the perforation cover is assembled on the upper bowl via an assembly allowing a relative pivoting of the lid against the upper bowl, between a first pivoting position where the lid perforates the capsule wall 35 and a second pivoting position where these perforations are enlarged to form said first and second hot air openings.

In the embodiment shown, this assembly is a bayonet assembly. In this case, as illustrated in Figures 3, 6 and 7, the cover 4 has three peripheral bayonets spaced apart at 120 °, and the upper bowl has three grooves equally spaced apart at 120 °. Each bayonet penetrates into one of the grooves that corresponds to it and can slide there during the passage of the cover between its first and second pivoting positions.

Alternatively, the lid could be assembled on the upper bowl via threads

(screw nut assembly).

The tube 41 which is provided with the cutting edge 410 has a straight cylinder outer shape centered on the lid and extending along an axis of revolution of the lid. During its passage between its first and second pivoting positions, the lid pivots with respect to the upper bowl along this axis of revolution.

Three cutting shapes 36 each having a circular cutting edge are formed under the perforation cover 43. Each of these shapes 36 is used to make one of the second openings 32 which corresponds to it when the lid is pivoted.

By this symmetrical arrangement of the second openings 32 around the first opening 31 is obtained at each moment of combustion, a homogeneous displacement of the combustion limit surface in the capsule.

The combustion limit surface is the surface that delimits a volume of smokable material already burnt vis-à-vis a volume of smokable material remaining burned. This combustion limit surface progresses inside the capsule from a high NH level towards the bottom of the bowl. As the smokable material is arranged in a ring around the central zone Zc, the combustion limit forms a homogeneous hollow disk around the central zone.

The invention is not limited to what has just been described above and it can combine some of the embodiments of the device, the assembly and the capsule presented above.

For example, the heating chamber 35 described above is formed above the recess 11 and is separated from this recess 11 by the perforation cover.

However, it is also possible that the heating chamber is formed on the sides or below the recess 11.

Similarly, the heating can be performed using a heating device, such as a heating resistor does not necessarily require a heating chamber.

Thus, one could consider that the cover incorporates such a resistance.

It is also conceivable that the heating resistor is simply placed in the heating chamber made according to any one of the heating chamber embodiments presented above.

Claims

1) Capsule (3) having a wall delimiting an internal space (33) to the capsule containing a volume of smokable material (2), the wall of the capsule comprising:

- a bowl (34) having a bottom and an annular peripheral wall of the bowl, said annular peripheral wall defining an upper opening (34a) of the bowl (34);

- a lid (35) closing the upper opening (34a) of the bowl (34);

the volume of smokable material (2) being placed in the trough, against the bottom of the trough and defining a high level (NH) of smokable material in the capsule, this high level (NH) being at a distance from said operculum (35) , characterized in that the bottom of the bowl (34) has a central zone (Zc) rising above the volume of smokable material and above said high level (NH) of smokable material.

2) Capsule (3) according to claim 1, wherein the lid is formed of a material whose thickness is less than the thickness of the constituent material of the bowl.

3) Capsule (3) according to any one of claims 1 or 2, wherein the lid and the bowl are essentially made of aluminum.

4) Capsule (3) according to any one of claims 1 to 3, wherein the cap has a perimeter sealingly attached along a peripheral edge of the upper opening (34a) of the bowl (34) . 5) Capsule (3) according to claim 4, wherein said periphery of the lid is attached to the peripheral edge of the upper opening (34a) via crimping or gluing or welding or solder.

6) Capsule (3) according to any one of claims 1 to 5, wherein a varnish of food protection is applied inside the capsule so that the smoking material is in contact only with a varnished surface.

7) Capsule (3) according to any one of claims 1 to 6, wherein said varnish is used to adhere the lid to a rim of the bowl. 8) Capsule (3) according to any one of claims 1 to 7, wherein the capsule has a lower outer face having a shape of revolution which when observed in cross section in a plane containing an axis of revolution has a shape in W.

9) Capsule (3) according to claim 8, wherein the W-shaped has three rounded tops.

10) Capsule (3) according to any one of claims 1 to 9, wherein the smokable material is arranged in a ring around the central zone (Zc).