RECIPIENT DEFORMABLE SANS REPRISE D’AIR

Abstract

The present invention relates to a container (10) comprising: - an outer container (12) capable of being elastically deformed, and - a flexible and leak-proof inner layer (26) delimiting a storage volume (28) for the product to be dispensed and configured to retract as the product is dispensed, - a dispensing device (30) comprising a first one-way valve (34) and a support (32) defining a receiving chamber for the first one-way valve (34), the first one-way valve (34) comprising: - a flexible, elastically deformable membrane, - a sealing seat received in a fixing cavity of the receiving chamber, a dispensing cavity of the receiving chamber comprising recesses adapted to allow the passage of the product in a dispensing state of the first one-way valve (34). Figure for the abstract: 2

Description

Title of the invention: DEFORMABLE CONTAINER WITHOUT AIR RECOVERY Technical field of the invention

[0001] The present invention relates generally to an airless container (or "airless" according to English terminology), intended to contain a liquid or pasty product and associated with a distribution device without air intake. Technical background

[0002] An airless container is a container that holds a product that is not in contact with atmospheric air. This type of container is advantageous because it allows the product to be preserved for longer after opening without the need to add preservatives to the product's composition and also limits product contamination.

[0003] Furthermore, airless containers are advantageous in that they allow for the efficient distribution of viscous products, unlike atmospheric containers which require a certain fluidity for the product to flow along the walls.

[0004] Currently known airless containers include rigid containers equipped with an airless pump comprising a dosing chamber and actuated by a push button. Actuating the pump by the push button forces the product from the dosing chamber to the dispensing orifice. The pump draws the product from the airless container by means of a vacuum created in the dispensing element to transfer a volume of product from the container into the pump's dosing chamber when the push button is released.

[0005] However, this type of "airless" container, although efficient, has the disadvantage of being tedious and complex to assemble due to the large number of parts required.

[0006] In addition, the use of a pump involves the use of different materials such as plastic, steel and glass, complicating its subsequent recycling.

[0007] Finally, this type of "airless" container combined with a pump limits the possible shapes of the container due to the very structure of the pump. Indeed, "airless" containers are overwhelmingly piston systems whose main constraint is their cylindrical shape to ensure a good seal.

[0008] Also, there is a need to offer an "airless" type container, simple to manufacture and assemble with fewer parts, easily recyclable and easy to use for a user and able to take various shapes. Summary of the invention

[0009] The invention provides a container for containing and dispensing a liquid or paste-like product comprising:

[0010] - an external container comprising an external side wall, an external bottom and an internal surface that delimits an internal volume of the outer container, said outer container being capable of being elastically deformed as a result of pressure exerted on said outer side wall, and

[0011] - a flexible and waterproof inner layer that extends into the internal volume of the outer container, the flexible inner layer delimiting a storage volume for the product to be dispensed, and the flexible inner layer being configured to retract as the product is dispensed,

[0012] - a product dispensing device mounted on an upper end of the external container, the dispensing device comprising a support and a first one-way valve, the support defining a receiving chamber for the first one-way valve, extended by an outlet for the product from the storage volume,

[0013] the first unidirectional valve comprising:

[0014] - a flexible membrane that is elastically deformable and held at its center by a fixing stud, said flexible membrane comprising an upper face and an lower face,

[0015] - a sealing seat received in a fixing cavity of the receiving housing and fixed securely in the mounting cavity, the sealing seat includes a receptacle into which the mounting stud is fitted,

[0016] - a free end of said flexible membrane cooperating with said seat sealing of said first one-way valve in a closed state of the first one-way valve and such that said flexible diaphragm can detach from said sealing seat when the first one-way valve is in a dispensing state,

[0017] a distribution cavity of the receiving housing extending between the fixing cavity and the outlet orifice, the distribution cavity being delimited by a main wall of the support and including recesses suitable for allowing the passage of the product in the distribution state of the first one-way valve.

[0018] According to other features of the invention: - the distribution cavity comprises a hemispherical shape delimited by the main wall of the support; - the fixing cavity of the receiving housing is delimited by a cylindrical wall of the support which extends from the main wall of the support and into the internal volume of the outer container; - the recesses are separated from each other by contact surfaces formed on the main wall in the distribution cavity so that the free end of the flexible membrane slides against the contact surfaces when it detaches from the sealing seat; - the recesses extend substantially from a base of the hemispherical distribution cavity to substantially a vertex of the distribution cavity; - the flexible inner layer is configured to delaminate from the inner surface of the outer container; - the container includes a second one-way valve installed in a base of the container mounted on a lower end of the outer container and at least overlapping the outer bottom, the base delimiting with the outer bottom an intercalated space in fluidic communication with the internal volume via at least one natural opening formed in the outer bottom, the second one-way valve being configured to allow the passage of a fluid only to the intercalated space. Brief description of the figures

[0019] Other features and advantages of the invention will become apparent upon reading the detailed description that follows, for an understanding of which reference should be made to the accompanying drawings in which:

[0020] [Fig.la] is a general perspective view of a container according to an example of the invention comprising an outer container and a distribution device without air intake equipped with a hood in the closed position;

[0021] [Fig.lb] is a general perspective view of the container of [Fig.la] whose hood is in an open position;

[0022] [Fig.2] is an axial cross-sectional view of the container of [Fig.1a] showing the device distribution unit equipped with a first unidirectional valve and a base equipped with a second unidirectional valve;

[0023] [Fig.3] is a close-up cross-sectional view of the distribution device without recirculation air from the container of the [Fig.lb] including a support delimiting a receiving housing for the first one-way valve, the hood being in its open position;

[0024] [Fig.4] is a close-up cross-sectional view of the distribution device without recirculation air from the container of the [Fig.la] including the support delimiting the receiving housing of the first one-way valve, the hood being in its closed position;

[0025] [Fig.5] is a close-up cross-sectional and perspective view of the distribution device without air intake showing a distribution cavity of the receiving housing equipped with recesses;

[0026] [Fig.6a] is a schematic view of the container in use when a user exerts pressure against an outer side wall of the outer container of the receptacle;

[0027] [Fig.6b] is a schematic view of the container in use when a The user releases the pressure against the outer side wall of the outer container. Detailed description of the invention

[0028] In the description that follows, identical, similar or analogous elements will be designated by the same reference numerals.

[0029] Figures 1a and 1b illustrate a container 10 for dispensing a liquid or pasty product such as, for example, a cream, an ointment or a paste, particularly for cosmetic use.

[0030] The container 10 includes an outer container 12 which includes an outer side wall 14 and an outer bottom 16.

[0031] In particular, the outer side wall 14 extends around an axis of revolution R so as to give a cylindrical shape to the outer container 12 of the container 10.

[0032] It should also be considered that the outer container could take any other form without departing from the scope of the invention.

[0033] The outer container 12 also includes an internal surface 18 which delimits an internal volume 20 of the outer container 12.

[0034] It is then understood that the internal volume 20 is closed at a lower end 22 of the external container 12 by the external bottom 16.

[0035] The outer side wall 14 is capable of elastically deforming as a result of pressure exerted on said outer side wall 14.

[0036] In other words, the outer side wall 14 is capable of deforming under the effect of mechanical pressure, for example pressure exerted by the hand of a user, and then returning to its initial undeformed state without breaking or damaging its material, when the mechanical pressure ceases, for example when the user's hand releases the outer side wall 14.

[0037] The container 10 also includes a flexible and waterproof inner layer 26 which extends into the internal volume 20 of the outer container 12. More precisely and according to the illustrated example, the flexible inner layer 26 extends over the internal surface 18.

[0038] The flexible inner layer 26 then delimits a storage volume 28 of the product to be distributed.

[0039] According to a non-limiting example of the invention, the flexible inner layer 26 is configured such that it delaminates from the inner surface 18 of the outer container 12.

[0040] In other words, the flexible inner layer 26 is configured to detach from the inner surface 18 and then to retract as the product is distributed.

[0041] The operation of the flexible inner layer 26 will be detailed later, during the description of the product distribution process.

[0042] The container 10 also includes a product distribution device 30, particularly visible in figures 3 to 5.

[0043] In particular, the distribution device 30 according to the invention is a distribution device without air recirculation.

[0044] The dispensing device 30 is mounted on the upper end 24 of the outer container 12.

[0045] The distribution device 30 includes among other things a support 32 and a first one-way distribution valve 34.

[0046] In particular the support 32 includes a main wall 36 which extends in a radial plane of the outer container 12, considering the axis of revolution R of the outer side wall 14.

[0047] The main wall 36 extends in particular by covering the internal volume 20 of the external container 12.

[0048] The main wall 36 is extended peripherally by a fixing skirt 38 comprising a first fixing means 40 adapted to cooperate with a second complementary fixing means 42 formed on the outer side wall 14, at the upper end 24 of the outer container 12, so as to secure the support 32 to the upper end 24 of the outer container 12.

[0049] According to the illustrated example, the first fixing means 40 is formed by an internal lug of the fixing skirt 38 and the second fixing means 42 is formed by a shoulder under which the first fixing means 40 is housed, so as to fix the support 32 on the upper end 24 of the outer container 12 by clipping.

[0050] According to another non-limiting and unillustrated example, the first fastening means and the second fastening means can take the form of complementary threads.

[0051] The support 32 also includes an outlet 44 for the product from the storage volume 28.

[0052] More precisely, the outlet orifice 44 is formed on the main wall 36 of the support 32.

[0053] More precisely, the outlet orifice 44 is formed at the end of a cylindrical passage 46 delimited by the main wall 36 of the support 32.

[0054] As can be seen in the example of figures 3 and 4, the support 32 includes a hood 48 mounted pivotally relative to the main wall 36.

[0055] It should also be considered that, in a non-limiting manner, the support could be without a cover without this example falling outside the scope of the invention.

[0056] The hood 48 includes a sealing appendage 50 configured to cooperate by complementary shape with the cylindrical passage 46 of the support 32.

[0057] In other words, the sealing appendage 50 is configured to enter the cylindrical passage 46 by complementary shape.

[0058] It is thus understood that the cooperation between the sealing appendage 50 and the cylindrical passage 46 makes it possible to block the passage of the product through the outlet orifice 44.

[0059] Thus and according to the illustrated and non-limiting example, the hood 48 is mounted pivoting relative to the main wall 36 by means of a pivoting joint and such that the hood 48 pivots between an open position where its sealing appendage 50 extends outside the cylindrical passage 46 as seen in [Fig.3] and a closed position in which its sealing appendage 50 extends into the cylindrical passage 46 as described above.

[0060] It should also be considered that, in a non-limiting manner, the hood may be without a pivoting joint and could include any other means allowing its movement from the open position to the closed position without going out of the scope of the invention.

[0061] Visible in figures 3 to 5, the support 32 delimits a receiving housing 52 of the first unidirectional valve 34.

[0062] More specifically, the receiving housing 52 includes a fixing cavity 54 and a distribution cavity 56.

[0063] Thus, considering the axis of revolution R of the outer side wall 14, the fixing cavity 54 is extended axially by the distribution cavity 56 and then by the cylindrical passage 46 at the end of which the outlet orifice 44 is formed.

[0064] The first one-way valve 34 includes a sealing seat 58 received in the mounting cavity 54 of the receiving housing 52. More particularly, the sealing seat 58 is fixed in a hermetic manner in the mounting cavity 54.

[0065] It is therefore understood that the sealing seat 58 is an added part in the fixing cavity 54.

[0066] According to the illustrated and non-limiting example, the fixing cavity 54 is delimited by a cylindrical wall 60 of the support 32 which extends from the main wall 36 into the internal volume 20.

[0067] According to the illustrated example, the cylindrical wall extends coaxially around the axis of revolution R, and in such a way that it delimits the cylindrical-shaped fixing cavity 54.

[0068] Thus, according to this example of the invention, the sealing seat 58 comprises a fixing wall 62 which extends circularly around the axis of revolution R so as to form a cylinder of complementary shape to the fixing cavity 54.

[0069] Thus, according to a non-limiting example of the invention, the fixing wall 62 comprises a first fixing element enabling the sealing seat 58 to be secured in the fixing cavity 54 by cooperation with a second complementary fixing element formed by or on the cylindrical wall 60 delimiting the receiving cavity 54.

[0070] For example, the fixing wall 62 and the cylindrical wall 60 can be joined together by clipping or by force-fitting the fixing wall 62 into the fixing cavity 60.

[0071] The sealing seat 58 further includes a transverse wall 68 which extends in a radial plane considering the axis of revolution R, at an axial end of the fixing wall 62.

[0072] The first unidirectional valve 34 comprises a flexible membrane 70 elastically deformable and held in its center by a fixing stud 72.

[0073] Furthermore, the transverse wall 68 includes a receptacle 74 into which the fixing stud 72 is fitted.

[0074] In the illustrated example, the receptacle 74 takes the form of a through bore in which the fixing stud 72 is mounted.

[0075] In particular, the fixing stud 72 includes a peripheral shoulder 76 configured to form an axial stop against the transverse wall 68 when the fixing stud 72 is mounted in the receptacle 74 so as to lock the fixing stud 72 in position in the receptacle 74.

[0076] Fluid passage orifices 78 are formed on the transverse wall 68, at the periphery of the receptacle 74.

[0077] It is understood that the fluid passage orifices 78 are configured to allow the passage of the product from the storage volume 28 to the distribution cavity 56.

[0078] The flexible membrane 70 extends circularly around the fixing stud 72, considering the axis of revolution R.

[0079] A closed state of the first one-way valve 34, visible in Figures 3, 4 and 5, is defined in which it blocks the passage of the product from the storage volume 28 to the distribution cavity 56, and a distribution state of the first one-way valve 34, represented in dotted line on [Fig.4], in which it allows the passage of the product from the storage volume 28 to the distribution cavity 56.

[0080] Thus, it is understood that the flexible membrane 70 extends to cover the fluid passage orifices 78 of the transverse wall 68 when the first unidirectional valve 34 is in its closed state.

[0081] More precisely, a free end 80 of the flexible membrane 70 is configured to cooperate with the sealing seat 58 in the closed state of the first one-way valve 34.

[0082] More precisely, the flexible membrane 70 has a concave shape when the first one-way valve 34 is in its closed state, so as to improve the contact between its free end 80 and the sealing seat 58, in particular with the transverse wall 68, to form a tight contact between them.

[0083] In other words, the concave shape of the flexible membrane 70, together with its elastic deformation properties, makes it possible to produce a tight contact between the free end 80 of the flexible membrane 70 and the sealing seat 58 in the closed state of the first one-way valve 34.

[0084] A superior face 82 and a lower face 84 of the flexible membrane 70 are further defined, axially opposed to each other and such that the superior face 82 extends opposite the distribution cavity 56.

[0085] Thus, when the pressure exerted against the lower face 84 of the flexible membrane 70 is greater than that exerted against the upper face 82, the flexible membrane 70 deforms in such a way that its free end 80 moves away from the sealing seat 58, placing the first one-way valve 34 in its distribution state represented in dotted line in [Fig.4].

[0086] In other words, the detachment of the free end 80 of the flexible membrane 70 from the sealing seat 58 allows the passage of the product towards the distribution cavity 56, in particular by means of recesses 86 formed in the latter.

[0087] As can be seen in figures 3 to 5, the distribution cavity 56 has a hemispherical shape delimited by the main wall 36 of the support 32.

[0088] Furthermore, the recesses 86 are formed in the distribution cavity 56, on the main wall 36.

[0089] More precisely, the recesses 86 extend into a thickness of the main wall 36 of the support 32, in the distribution cavity 56.

[0090] More precisely, the recesses 86 extend along the axial direction considering the axis of revolution R, along the main wall 36 of the support 32, in the distribution cavity 56.

[0091] The recesses 86 extend substantially from a base of the hemispherical distribution cavity 56 to substantially a vertex of the distribution cavity 56, near the cylindrical passage 46.

[0092] As can be seen in figures 3 to 5, between the recesses 86 extend contact surfaces 88 formed on the main wall 36, in the distribution cavity 56.

[0093] The contact surfaces 88 are formed so that the free end 80 of the flexible membrane 70 slides against the contact surfaces 88 when it detaches from the sealing seat 58 in the distribution state of the first one-way valve 34, as shown in dotted lines in [Fig.4].

[0094] It is also understood that when the first one-way valve 34 passes from its closed state to its dispensing state, the free end 80 of the flexible membrane 70 detaches from the sealing seat 58 and slides against the contact surfaces 88 and at a non-zero distance from a bottom of the recesses 86 so that the product is able to move in the recesses 86 from the base of the dispensing cavity 56 to its top.

[0095] It is then understood that the recesses 86 allow the product to be guided from the storage volume 28 to the outlet 44 while controlling the quantity of product distributed.

[0096] As seen in [Fig.2], the container 10 includes a base 90 mounted on the lower end 22 of the outer container 12, covering at least the outer bottom 16.

[0097] The base 90 can be made to be attached to the lower end 22 of the outer container 12 by means similar to those used for attaching the support 32 to the upper end 24 of the outer container 12.

[0098] It should also be considered that the fixing between the base 90 and the lower end 22 of the outer container 12 is a watertight fixing.

[0099] An intercalary space 92 is then formed between the outer bottom 16 and the base 90.

[0100] Furthermore, the container 10 is configured such that the intercalated space 92 either in fluidic communication with the internal volume 20 of the external container 12.

[0101] More precisely and according to a non-limiting example, when the outer container 12 is manufactured by a co-extrusion blow molding process, a natural opening 94 is created between the two half-discs forming the outer bottom 16, the two half-discs not then being welded to each other.

[0102] It should be noted, however, that for the purposes of understanding, the natural opening 94 created in the outer bottom 16 of the outer container 12 has been represented to figures 6a and 6b in an amplified manner with regard to its size and shape, and should only be considered as a purely schematic representation of this natural opening 94.

[0103] The base 90 also incorporates a second unidirectional valve 96 without air intake, configured to allow only the passage of a fluid, here air, into the intercalated space 92 during a re-inflation phase of the outer container 12 which will be described more precisely during the description of the product distribution process.

[0104] It should also be considered that the second one-way valve 96 is substantially identical to the first one-way valve 34 with regard to its operation.

[0105] Thus, as for the first unidirectional valve 34 previously described, the second unidirectional valve 96 comprises a flexible membrane which extends from a fixing stud and which is configured to allow or prevent the passage of fluid into the intercalated space 92 by elastic deformation.

[0106] The second one-way valve 96 also includes a sealing seat configured to receive the fixing stud and which can take any shape as long as it allows on the one hand the retention of the fixing stud and on the other hand ensures a tight connection with the flexible membrane as described previously for the first one-way valve.

[0107] For example and without limitation, the sealing seat of the second one-way valve 96 can be directly formed by a wall of the base 90.

[0108] The product distribution process will now be described in relation to Figures 1 to 6b.

[0109] The dispensing method includes a first step in which a user pivots the hood 48 so that it moves from its closed position to its open position.

[0110] It is understood of course that in the case where the support 32 is without a cover 48, this step is optional.

[0111] Subsequently, the user exerts pressure against the outer side wall 14 so as to deform the latter, as seen in [Fig.6a].

[0112] During this deformation of the outer side wall 14 the second one-way valve 96 located in the base 90 of the container 10 blocks the fluidic passage at the outlet of the intercalated space 92, fluidically connected to the internal volume 20, thus creating an increase in pressure in the internal volume 20 of the outer container 12 and in the intercalated volume 92.

[0113] It is understood that this increase in pressure in the internal volume 20 and in the intercalated volume 92 displaces the first one-way valve 34 from its closed position to its distribution position and thus allows the product to move from the storage volume 28 through the fluid passage orifices 78 of the transverse wall 68 of the sealing seat 58 to circulate in the recesses 86 formed in the distribution cavity 86, thus guiding the product towards the outlet orifice 44.

[0114] Once the user has obtained the desired quantity of product, the latter releases the pressure exerted against the outer side wall 14.

[0115] As schematically illustrated in [Fig.6b], when the pressure against the outer side wall 14 is released, the latter returns to its initial shape due to its elastic deformation properties and a depression is formed in the storage volume 28 which generates the displacement of the first one-way valve 34 into its closed position and thus the progressive delamination and retraction of the soft inner layer 26.

[0116] Furthermore, when the pressure against the outer side wall 14 is released, the latter returns to its initial shape, which generates a suction phenomenon causing the opening of the second one-way valve 96 to allow air to pass into the intercalated space 92 and then into the internal volume 20 between the soft inner layer 26 and the inner surface 18 via the natural opening 94.

[0117] Thus, it is understood that as the product is distributed, the flexible inner layer 26 contracts back on itself.

[0118] It is therefore understood that the air intake of the container 10 according to the invention takes place, in the internal volume 20, between the flexible inner layer 26 and the internal surface 18 and that the distribution cavity 56 allows, when the first one-way valve 34 returns to its closed position, to limit the quantity of product remaining outside the storage volume 28.

[0119] Once the distribution is complete and the outer side wall 14 has returned to its initial undeformed position, the user can pivot the hood 48 to place it in its closed position, thereby increasing the sealing of the storage volume together with the first one-way valve 34 in its closed state.

[0120] This configuration of the first one-way valve, combined with the shape of the dispensing cavity, is advantageous because it allows for a dispensing device without air re-entry. The container is therefore an "airless" container, meaning that no air is re-entered after the product has been dispensed.

[0121] The use of the distribution device without air intake thus makes it possible to reduce contamination of the product contained in the storage volume, thereby increasing its durability and also to recover almost all of the product contained even if it does not flow due to high viscosity.

[0122] Furthermore, the use of unidirectional valves as described allows the use of a flexible container, i.e. with a deformable outer side wall, which allows the user to maintain the initial shape of the container.

[0123] Finally, the container as described, including the one-way valves and the flexible inner layer capable of gradually detaching from the wall, preferably by delamination, makes it possible to propose external containers without limitation of shape.

Claims

1. Demands Container (10) intended to contain and dispense a liquid or paste product comprising: - an outer container (12) comprising an outer side wall (14), an outer bottom (16) and an inner surface (18) delimiting an internal volume (20) of the outer container (12), said outer container (12) being capable of being elastically deformed as a result of pressure exerted on said outer side wall (14), and - a flexible and watertight inner layer (26) which extends into the internal volume (20) of the outer container (12), the flexible inner layer (26) delimiting a storage volume (28) of the product to be dispensed, and the flexible inner layer (26) being configured to retract as the product is dispensed, - a product dispensing device (30) mounted on an upper end (24) of the outer container (12), the dispensing device (30) comprising a support (32) and a first one-way valve (34), the support (32) defining a receiving housing (52) for the first one-way valve (34), extended by an outlet orifice (44) for the product from the storage volume (28), the first one-way valve (34) comprising: - a flexible membrane (70) elastically deformable and held in its center by a fixing stud (72), said flexible membrane (70) comprising an upper face (82) and an lower face (84), - a sealing seat (58) received in a fixing cavity (54) of the receiving housing (52) and fixed in a watertight manner in the fixing cavity (54), the sealing seat (58) comprising a receptacle (74) into which the fixing stud (72) is fitted, - a free end (80) of said flexible membrane (70) cooperating with said sealing seat (58) of said first one-way valve (34) in a closed state of the first one-way valve (34) and in such a way that said flexible membrane (70) can detach from said sealing seat (58) when the first one-way valve (34) is in a dispensing state, a dispensing cavity (56) of the receiving housing (52) extending between the fixing cavity (54) and the outlet port (44), the dispensing cavity (56) being delimited by a main wall (36) of the support (32) and comprising recesses (86) suitable for permitting the passage of the product in the dispensing state of the first one-way valve (34).

2. Container (10) according to the preceding claim, in which the distribution cavity (56) comprises a hemispherical shape delimited by the main wall (36) of the support (32).

3. Container (10) according to any one of the preceding claims, wherein the fixing cavity (54) of the receiving housing (52) is delimited by a cylindrical wall (60) of the support (32) which extends from the main wall (36) of the support (32) and into the internal volume (20) of the outer container (12).

4. Container (10) according to any one of the preceding claims, wherein the recesses (86) are separated from each other by contact surfaces (88) formed on the main wall (36) in the distribution cavity (56) such that the free end (80) of the flexible membrane (70) slides against the contact surfaces (88) when it detaches from the sealing seat (58).

5. Container (10) according to any one of the preceding claims in combination with claim 2, wherein the recesses (86) extend substantially from a hemispherical base of the distribution cavity (56) to substantially a vertex of the distribution cavity (56).

6. Container (10) according to any one of the preceding claims, wherein the flexible inner layer (26) is configured to delaminate from the inner surface (18) of the outer container (12).

7. Container (10) according to any one of the preceding claims, comprising a second one-way valve (96) installed in a base (90) of the container (10) mounted on a lower end (22) of outer container (12) and at least overlapping the outer bottom (16), the base (90) delimiting with the outer bottom (16) an intercalated space (92) in fluidic communication with the internal volume (20) via at least one natural opening (94) formed in the outer bottom (16), the second one-way valve (96) being configured to allow the passage of a fluid only towards the intercalated space (92).

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