Fluid dispenser

Abstract

Described is a dispenser (1) for dispensing a fluid contained in a bottle made of plastic material, comprising: an annular nut (2) defining a receiving portion (5) and having a central tubular element (3) which in turn defines a cylindrical conduit (4) for drawing the fluid; an accordion-like deformable element (6) comprising a lateral wall (7) defining a metering chamber (8); a dispensing head (9) which can be pressed by a user and is equipped with a collection chamber (10) designed to collect the fluid flowing out of the metering chamber (8). The accordion-like deformable element (6) comprises a lower tubular portion (11) axially slidable within a first annular space (12) defined between the central tubular element (3) and the receiving portion (5) of the ring nut (2). The distributor (1) further comprises a plurality of first ribs (24) and second ribs (25) located on the receiving portion (5) and the lower tubular element (11), respectively. The lower tubular portion (11) in the raised position of the dispensing head (9) ensures a fluid seal with the receiving portion (5). In the lowered position, the lower tubular portion (11) defines a passage for compensating the flow of air, which passage is distinct and separate from the distribution conduit.

Description

Technical Field

[0001] The present invention relates to a dispenser for dispensing a fluid. In other words, the present invention relates to a dispensing device adapted to the neck of a bottle to dispense the fluid contained in the bottle. Background Art

[0002] There are various types of prior art dispensers, ranging from dispensers with complex structures to dispensers with simple structures.

[0003] Unfortunately, these devices are often made of a different material than the bottle to which they are attached, and a careless user may not separate the dispenser from the bottle when disposing of the waste, thus making the two components inefficient to recycle, especially when reaching a waste sorting area, requiring long sorting times.

[0004] In general, the use of dispensers is known which are provided with a simple structure and thus with a reduced number of parts, thereby having an environmentally sustainable product provided with homogeneous materials to simplify recycling.

[0005] Among them, dispensers are well known, which are based on an accordion-like deformable element which acts as a spring and delimits a dispensing chamber for the outflowing fluid. These elements can also integrate non-return valves which regulate the feeding and discharge of the fluid from the metering chamber by opening appropriately to achieve a specific pressure difference, with the advantage of minimizing the number of components used and the corresponding material.

[0006] A disadvantage of these dispensers is that some components, especially those integrating various functions, have poor versatility of use and if they are designed to optimize performance based on the characteristics of the specific fluid to be dispensed, they generally cannot guarantee adequate operation when the dispenser is used with fluids having different characteristics.

[0007] Generally, disadvantageously, some dispensers having this simplified structure do not have a compensation system and therefore cannot replenish the volume of fluid extracted from the bottle with air, since they are generally used in systems that do not require a compensation system.

[0008] Furthermore, some of them are equipped with a compensation system which can be activated by means of a release device, which allows the dispenser to be activated which would otherwise not be possible.

[0009] However, the main disadvantage of these systems is that once the dispenser is in the release configuration, the passage for the air flow is always open. In this case, the package is not sealed and if the bottle is overturned and / or squeezed, the liquid may accidentally leak through the passage for the compensating air flow.

[0010] Finally, prior art dispensers require certain construction specifications to allow for safe transportation, a feature that is disadvantageously lacking in the simplified structures described above. Summary of the invention

[0011] Therefore, the technical purpose of the present invention is to provide a dispenser for dispensing fluids that is able to overcome the disadvantages of the prior art.

[0012] It is therefore an object of the present invention to provide a dispenser for dispensing a fluid having a simplified structure capable of being used in systems requiring the presence of a compensation system to replenish the volume of fluid extracted.

[0013] Another object of the present invention is to provide a dispenser for dispensing fluids which has a degree of robustness enabling it to be dispensed without specific protective devices.

[0014] Another object of the present invention is to provide a dispenser for dispensing fluids having features such as to allow recycling in a safe manner.

[0015] Another object of the present invention is also to provide a dispenser for dispensing fluids that allows versatility of use of the dispenser with any type of fluid.

[0016] Finally, the technical aim of the present invention is to provide a dispenser that prevents accidental leakage of fluid from the package when the dispenser is unlocked and not actuated, by a system that allows the air to recombine completely and correctly during the stroke that actuates the dispenser.

[0017] The technical purpose stated and the aims specified are substantially achieved by a dispenser for dispensing a fluid, comprising the technical characteristics described in one or more of the appended claims. The dependent claims correspond to possible embodiments of the invention.

[0018] Other features and advantages of the present invention will become apparent from the following non-limiting description of a non-exclusive embodiment of a dispenser for dispensing a fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following description is made with reference to the accompanying drawings, which are only for illustrative purposes and do not limit the scope of the present invention. In the accompanying drawings:

[0020] - Figure 1 is a perspective schematic diagram of a dispenser according to the present invention;

[0021] - Figure 2 is a schematic exploded view of one embodiment of a dispenser according to the present invention;

[0022] - Figure 3 and Figure 4 is a perspective schematic diagram of components of a dispenser according to the present invention;

[0023] - Figure 4A and Figure 4B are schematic diagrams of two usage configurations of the dispenser according to the present invention. DETAILED DESCRIPTION

[0024] With reference to the accompanying drawings, a dispenser for dispensing a fluid contained in a bottle is indicated as a whole as dispenser 1 .

[0025] The dispenser 1 is made of a plastic material to simplify recycling. Preferably, the dispenser 1 is made of polyethylene. Even more preferably, the plastic material is a bioplastic produced from a non-fossil source. In other words, the parts making up the dispenser 1 are sized to be made of a single plastic family (e.g. polyethylene) so that it can also be recycled together with the bottle, which is also made of polyethylene when not transparent.

[0026] Advantageously, the above-mentioned bioplastics (made from non-fossil sources) are present in the polyethylene family and are in particular recyclable and / or biodegradable.

[0027] The dispenser 1 comprises a ring nut 2 which can be screwed onto the neck of a bottle (not shown).

[0028] The ring nut 2 is provided with an assembly part capable of being screwed onto the neck of the bottle. The figures show a fastening system 2a (defining the body of the ring nut 2) made in a substantially cylindrical shape. The body of the ring nut 2 has a peripheral wall (in particular a single circular lateral wall) the inside of which is provided with a thread designed to allow it to be screwed onto the neck of the bottle. The threaded fastening system 2a can be replaced by other coupling systems for bottles (not shown), such as a snap-on system or the like.

[0029] The dispenser 1 is also equipped with a sealing element "G" located inside the peripheral wall of the ring nut 2 to ensure sealing with the bottle.

[0030] The ring nut 2 has a central tubular element 3a, the interior of which is suitably shaped to form an axial duct 4 for aspirating fluid. The central tubular element 3 is designed to allow the connection of a suction tube (not shown) for aspirating fluid from a bottle.

[0031] According to a possible embodiment of the dispenser 1 for dispensing fluids, as shown in the accompanying figures, the central tubular element 3 has a neck 3b in a middle area.

[0032] The neck 3b partially blocks the conduit 3 and preferably has a substantially circular shape.

[0033] The neck 3b is designed to border with the first stop element 20. The first stop element 20 may preferably be made in a substantially spherical shape, as shown in the drawings.

[0034] Specifically, the first shut-off element 20 is configured to be placed on the neck 3b and rise from the neck 3b, thereby forming a fluid check valve together with the neck 3b. In other words, the first shut-off element 20 can be made into any shape for making the above-mentioned check valve.

[0035] Alternatively, according to another possible embodiment of the dispenser 1 for dispensing a fluid, the ring nut 2 has an orifice for sucking the fluid.

[0036] This orifice is located in the central part of the ring nut 2 and is designed to allow the connection of a suction piece (not shown) to draw product from the bottle. Preferably, the orifice is defined by a central tubular element 3.

[0037] In both proposed embodiments, the annular nut 2 also comprises a receiving portion 5 circumscribing the central tubular element 3 so as to define a first annular space 12 between the central tubular element 3 and the receiving portion 5 .

[0038] In more detail, the receiving portion 5 is cup-shaped, with the recess facing upwards to form an annular space 12. Furthermore, the receiving portion 5 engages with the middle portion of the central tubular element 3, dividing the latter into an upper portion 3a (delimiting the annular space 12) and a lower skirt 3c, facing the interior of the container, suitable for connection to a suction tube.

[0039] As shown in the drawings, the central tubular element 3 and the receiving portion 5 are made in one piece, and preferably, the entire ring nut 2 is made in one piece.

[0040] For example, as shown in the figures, the cup-shaped receiving portion 5 is defined by a first wall 5a substantially parallel to the central tubular element 3 and laterally delimiting a first annular space 12, and a second wall 5b transverse to the first wall 5a and delimiting the bottom of the first annular area 12. In other words, the first wall 5a extends concentrically with the central tubular element 3, and the second wall 5b defines an annular element to connect the first wall 5a and the upper portion 3a of the central tubular element 3.

[0041] The first annular space 12 is thus delimited laterally by the first wall 5a and the upper portion 3a of the central tubular element 3 and below by the second wall 5b connecting the central tubular element 3 and the first wall 5a of the receiving portion.

[0042] The ring nut 2 has a series of through holes 13 for placing the first annular space 12 in fluid communication with the interior of the bottle.

[0043] As shown in the drawings, the through hole 13 may be defined on the second wall 5 b of the receiving portion 5 .

[0044] For example, as shown in the accompanying drawings, the dispenser 1 also includes a collar 17, which is connected to the ring nut 2 to transmit the rotational movement to the ring nut 2. The collar 17 and the ring nut 2 are connected to each other by parts 18a and 18b shaped to match each other. The parts 18a and 18b have a main axial extension.

[0045] In other words, the portion 18 a of the collar 17 is inserted in a complementary manner into the portion 18 b of the ring nut 2 .

[0046] The collar 17 is also provided with one or more undercuts (defined in the lower portion of the collar 17 ) designed to improve the connection between the collar 17 and the ring nut 2 .

[0047] According to an embodiment not shown, the dispenser 1 may not be provided with the collar 17 .

[0048] The dispenser 1 is also provided with an accordion-shaped deformable element 6 ( Figure 3 ), which element defines the return spring of the dispenser 1.

[0049] The accordion-shaped deformable element 6 comprises a lower tubular portion 11 partially inserted or insertable into the first annular space 12 , and an accordion-shaped deformable lateral wall 7 formed integrally with the lower tubular portion 11 .

[0050] The lateral wall 7 of the accordion-like deformable element 6 delimits a metering chamber 8 of the dispenser 1 and at the same time constitutes a deformable element designed to define a return spring of the dispenser 1 .

[0051] Preferably, the accordion-shaped deformable element 6 has a connection extension with the lower tubular portion 11 , which connection extension is configured to define opposite elastic deformations between the accordion-shaped deformable element 6 and the lower tubular portion 11 .

[0052] The accordion-like deformable element 6 is configured to elastically maintain a stable configuration corresponding to the raised position of the lower tubular portion 11 relative to the first annular space 12 .

[0053] According to a possible embodiment, Figure 4A As shown, during use, the pressure in the metering chamber 8 allows controlling the above-mentioned first shut-off element 20 , in particular its movement.

[0054] More specifically, the first shut-off element 20 is configured to be positioned to rest on the neck 3 b and to rise in the event of a negative pressure in the metering chamber 10 a , thereby allowing the fluid to be extracted from the bottle.

[0055] Furthermore, when the first shut-off element 20 abuts against the neck 3b, it blocks the duct 4, preventing the fluid from returning from the metering chamber 8 to the bottle.

[0056] In this way, the first shut-off element 20 together with the neck 3 b forms a non-return valve for the fluid at the inlet of the metering chamber 8 .

[0057] Therefore, the first shutoff element 20 may be formed into any shape that allows the neck 3 b to be blocked, thereby allowing the above-mentioned check valve to be opened and closed according to the pressure applied to the first shutoff element 20 .

[0058] According to a second embodiment not shown, the lower tubular portion 11 is equipped with a dome-shaped element which rests on the orifice forming the inlet valve for the product. Preferably, the dome-shaped element is connected by a thread-shaped element to the conical element of the accordion-shaped deformable element 6. The combination of the thread-shaped element and the accordion-shaped deformable element 6 allows the dome-shaped element to be correctly positioned relative to the orifice of the annular nut 2 (i.e. the central tubular element 3).

[0059] In particular, the internal pressure of the metering chamber 8 allows controlling the aforementioned dome-shaped element. More specifically, the dome-shaped element is designed to rise in the event of a negative pressure in the metering chamber 8. By opening, the dome-shaped element allows the product to be extracted from the bottle.

[0060] In both embodiments, the accordion-shaped deformable element 6 may have an upper portion 16 that is configured to be coupled to a ring 19 .

[0061] The ring 19 is located on the ring nut 2 and is configured to define, with the ring nut 2 , a locking system designed to define an operative configuration and a non-operative configuration of the dispenser 1 .

[0062] The term "operating configuration" refers to the configuration in which the dispenser 1 can be actuated and is able to dispense a fluid drawn from a bottle.

[0063] The term "non-operational configuration" refers to a configuration in which the dispenser 1 cannot be actuated and therefore cannot dispense fluid.

[0064] Specifically, the ring 19 can define the above two configurations by means of reciprocating rotation between the ring 19 and the ring nut 2 .

[0065] Dispenser 1 can be controlled by the user in such a way as to allow dispensing head 9 to adopt operative and inoperative configurations, dispensing head 9 being slidably coupled to said ring nut 2 by means of said ring 19 and connected below again by means of said ring 19 to said accordion-like deformable element 6 .

[0066] The term "operational configuration" Figure 4 a) refers to the configuration of the dispensing head 9 when the dispenser 1 is in an operating configuration, wherein it is depressed and subsequently moved from a raised position to a lowered position relative to the bottle, causing the dispenser 1 to dispense fluid through the outlet channel (21).

[0067] In said lowered position, the accordion-like deformable lateral wall 7 is axially compressed.

[0068] Thus, as the dispensing head 9 is lowered, the lower tubular portion 11 of the accordion-like deformable element 6 is in a lowered position within the first annular space 12 .

[0069] In addition, the term "non-operational configuration" ( Figure 4B ) refers to the configuration of the dispensing head 9 when the dispenser 1 is in an operational configuration or a non-operational configuration, wherein the dispensing head 9 is still in a raised position relative to the bottle and the accordion-shaped deformable lateral wall 7 is axially extended (in other words, the dispensing head 9 is not pressed and the fluid is not dispensed).

[0070] Specifically, the dispensing head 9 is equipped with a collecting chamber 10 designed to collect and distribute the fluid flowing out of the metering chamber 8 of the accordion-shaped deformable element 6 through a central opening 12 b which puts the metering chamber 8 and the collecting chamber 10 in communication.

[0071] The central opening 12 b is configured to define, together with the second shut-off element 26 , a further non-return valve which operates when fluid is transferred from the metering chamber 8 to the collecting chamber 10 .

[0072] More specifically, the second shut-off element 26 is integral with the dispenser head 9 and is movably housed in the central opening 12 b of the ring 19 .

[0073] Specifically, the second shut-off element 26 has an anchoring portion 26 a, which is preferably annular and designed to be stably received in a receiving portion of the dispensing head 9 , so that the second shut-off element 26 is integrated with the dispensing head 9 .

[0074] Furthermore, the second shut-off element 26 has a sealing portion 26 b which has a substantially elongated shape and is designed to block the central opening 12 b, forming a closed configuration of the delivery valve.

[0075] The second shutoff element 26 also has a connecting portion 26c which couples the sealing portion 26b to the anchoring portion 26a and is configured to allow the sealing portion 26b to move relative to the anchoring portion 26b by elastic deformation, thereby opening the delivery valve when the pressure of the metering chamber 8 is greater than a predetermined threshold.

[0076] According to a second embodiment, the portion 16 of the accordion-like deformable element 6 is provided with a sealing lip designed to open if the pressure in the metering chamber 8 is greater than a predetermined threshold value.

[0077] The sealing lip replaces the second shut-off element 26 to all intents and purposes.

[0078] Preferably, the sealing lip is configured to open when the pressure in the metering chamber 8 exceeds a threshold value between 400 and 600 mbar.

[0079] Even more preferably, the sealing lip is configured to open when the pressure in the metering chamber 8 exceeds a threshold value of 600 mbar.

[0080] In both embodiments shown, the accordion-like deformable lateral wall 7 delimits internally a metering chamber 8 and externally a second annular space 12 a between the ring nut 2 and the lateral wall 7 .

[0081] Preferably, the ring 19 (ie the dispenser head 9 according to an alternative embodiment in which the ring 19 and the dispenser head 9 are made in one piece) comprises one or more axial projections 23 extending axially inside the metering chamber 8 and configured to come into contact with the accordion-shaped deformable element 6 .

[0082] The axial protrusion 23 transmits the flattening force from the dispensing head 9 to the lower tubular portion 11 , facilitating the lower tubular portion 11 to reach the lowered position.

[0083] Advantageously, the lower tubular portion 11 of the accordion-like deformable element 6 is axially slidable within the first annular space 12 under said pressure of the dispenser head 9 .

[0084] In the raised position of the dispensing head 9, the lower tubular portion 11 forms a fluid-tight seal with the receiving portion 5, thereby isolating the first annular space 12. In other words, the lower tubular portion 11 isolates the first annular space 12 from the passage of compensating air.

[0085] In the lowered position, the lower tubular portion 11 defines a passage for the compensating air flow, distinct and separate from the distribution duct formed by the suction duct 4, for communicating the first annular space with the second annular space. In other words, the lower tubular portion 11 is deformed so as to allow the passage of air between the second annular space 12a and the first annular space 12 and through the through-hole 13.

[0086] Due to the fact that the through hole 13 is permanently open, and due to the first annular space 12, an air flow passes between the second annular space 12a and the volume of the container, thus ensuring that compensation occurs.

[0087] Preferably, the lower tubular portion 11 is radially elastically deformable. Thus, in the lowered position of the dispenser head 9, at least one elastically deformed portion of the lower tubular portion 11 defines a path for the air flow.

[0088] In the static state, the accordion-shaped deformable element 6 is in a raised position, that is, it does not rest on the "flange" of the annular nut 2, so that when the accordion-shaped deformable element 6 is compressed by the user's operating thrust, the lower tubular part 11 is allowed to slide axially downward in its receiving part 5 located on the annular nut 2.

[0089] When the pushing action of the user is removed and the accordion-like deformable element 6 returns to its rest configuration, the sliding simultaneously produces an opposite elastic deformation of the connecting stretch so as to return the lower tubular portion 11 to its raised initial state.

[0090] This sliding also allows one or more passages (connecting channels) to be opened to allow the air in the bottle to fill up, thus compensating for the escape of the dispensed liquid.

[0091] The lower tubular portion 11 of the accordion-like deformable element 6 and the receiving portion 5 of the ring nut 2 comprise a plurality of ribs.

[0092] The ribs 24 present on the receiving portion 5 are located on the inner side of the receiving portion 5 .

[0093] The ribs 25 present on the lower tubular portion 11 are located on the outer side in the lower tubular portion 11 .

[0094] According to the figures, ribs are present both on the lower tubular portion 11 of the accordion-like deformable element 6 and on the receiving portion 5 of the ring nut 2 .

[0095] The ribs 24, 25 are configured to deform locally at least one area of ​​the lower tubular portion 11 following the pressure of the dispenser head 9 and a corresponding sliding of the lower tubular portion 11 relative to the receiving portion 5, thereby defining a path for the air flow.

[0096] Furthermore, the ribs 24 , 25 are angularly distributed around the extension axis of the central tubular element 3 , preferably equidistantly distributed.

[0097] In the raised position of the dispenser head 9, the ribs 24, 25 are preferably located axially outside the cylindrical overlapping area between the lower tubular portion 11 and the receiving portion 5. In other words, in the raised portion ( Figure 4B ) the ribs 24, 25 are not inserted between the lower tubular portion 11 and the receiving portion 5, so that these two parts remain in contact, thereby ensuring an airtight seal.

[0098] Preferably, the rib 24 on the receiving portion 5 is positioned facing the interior of the first annular space 12 in the raised position of the dispensing head 9 .

[0099] The rib 24 is also detached from the lower tubular portion 11 , and is in particular situated below the lower edge of the lower tubular portion 11 .

[0100] Alternatively, in the raised position of the dispenser head 9 , the rib 25 situated on the lower tubular portion 11 faces the second annular space 12 a and is situated above the receiving portion 5 .

[0101] In short, the ribs include a first rib 24 located on the receiving portion 5 and facing the first annular space 12, and a second rib 25 located on the lower tubular portion 11 and facing the second annular space 12a (when the dispenser 1, i.e., the dispenser head 9 is in the raised position). In this case, the first rib 24 is separated from the lower tubular portion 11, and the second rib 25 is located above the lower tubular portion 12 and separated from the receiving portion 5.

[0102] At least in the raised position of the dispenser head 9 , the first rib 24 is axially spaced apart from the second rib 25 .

[0103] Preferably, each first rib 24 alternates with a pair of second ribs 25 at an angle.

[0104] Alternatively, each second rib 25 alternates angularly with a pair of first ribs 24 .

[0105] The plurality of ribs preferably includes at least two first ribs 24 and at least one second rib 25 alternating at an angle with the first ribs 24 .

[0106] The first rib 24 may be defined on the receiving portion 5 and the second rib 25 may be defined on the lower tubular portion 11 , or vice versa.

[0107] In this way, the first rib 24 and the second rib 25 do not hinder each other and actually define a plurality of passages for the compensating air.

[0108] Advantageously, the dispenser 1 described above makes it possible to overcome the disadvantages of the prior art.

[0109] Advantageously, the dispenser 1 described above allows for facilitated recycling due to the material from which it is made.

[0110] Advantageously, the dispenser 1 according to the invention has strong properties so as to allow safe dispensing without the use of special protective equipment.

[0111] Advantageously, the dispenser 1 according to the invention has the feature of ensuring a fluid-tight seal and forming at least one passage for compensating air flows, independent of the angular position adopted by the dispenser head 9 relative to the ring nut 2 .

Claims

1. A dispenser (1) for dispensing a fluid contained in a bottle, the dispenser being made of a plastic material, comprising: - an annular nut (2) comprising an assembly portion and a central tubular element (3), the assembly portion being screwable onto the neck of a bottle, the central tubular element defining a duct (4) for extracting a fluid from the bottle, the annular nut (2) also comprising a receiving portion (5) positioned around the central tubular element (3) so as to define a first annular space (12) between the central tubular element (3) and the receiving portion (5), the annular nut (2) also having a series of through holes (13) for placing the annular space in fluid communication with the interior of the bottle; - an accordion-shaped deformable element (6) defining a return spring of the dispenser (1), comprising a lower tubular portion (11) and an accordion-shaped deformable lateral wall (7) integral with the lower tubular portion (11), the accordion-shaped deformable lateral wall (7) defining internally a metering chamber (8) of the dispenser (1) and externally a second annular space (12a) between the annular nut (2) and the accordion-shaped deformable lateral wall (7), the lower tubular portion (11) being inserted into the first annular space (12) and being coupled to the receiving portion (5) of the annular nut (2); a dispensing head (9) slidably coupled to the annular nut (2) and connected below to the accordion-shaped deformable element (6) and provided with a channel designed to collect fluid from the metering chamber (8) of the accordion-shaped deformable element (6) at an outlet and to dispense the fluid through an outlet channel (21), the dispensing head (9) being pressable by a user between a raised position, in which the accordion-shaped deformable lateral wall (7) is axially extended, and a lowered position, in which the accordion-shaped deformable lateral wall (7) is axially compressed; - a plurality of first ribs (24) and a plurality of second ribs (25), respectively located in said receiving portion (5) and in said lower tubular portion (11) of said accordion-like deformable element (6); As the dispensing head (9) slides between the raised position and the lowered position, the lower tubular portion (11) of the accordion-shaped deformable element (6) is axially slidable within the first annular space (12); The lower tubular portion (11) defines, in the raised position of the dispensing head (9), a fluid seal with the receiving portion (5), the receiving portion isolating the first annular space (12) from the second annular space (12a), and also defines, in the lowered position of the dispensing head (9), at least one passage for a compensating air flow, distinct and separate from the suction duct (4), for placing the first annular space and the second annular space (12a) in communication with each other; and Characterized in that the plurality of first ribs (24) and the plurality of second ribs (25) are axially integrated with the distribution head (9) and are configured to form local deformation of at least one area of ​​the lower tubular portion (11) defining at least one elastic deformation portion following the pressure of the distribution head (9) and the corresponding sliding of the lower tubular portion (11) relative to the receiving portion (5).

2. Dispenser (1) according to the preceding claim, characterized in that In the raised position of the dispensing head (9), the first rib (24) and the second rib (25) are located axially outside the cylindrical overlapping area between the lower tubular portion (11) and the receiving portion (5).

3. The dispenser (1) according to claim 1 or 2, characterized in that The first rib (24) is located on the receiving portion (5) and faces into the first annular space (12), and in the raised position of the dispensing head (9), the first rib (24) is disengaged from the lower tubular portion (11) and is particularly located below the lower edge of the lower tubular portion (11).

4. The dispenser (1) according to any one of claims 1 to 3, characterized in that The second rib (25) is located on the lower tubular portion (11) and faces the receiving portion (5), and in the raised position of the dispensing head (9), the second rib (25) is located above the receiving portion (5).

5. Dispenser (1) according to any one of the preceding claims, characterized in that The first ribs (24) and the second ribs (25) are angularly distributed around the extension axis of the central tubular element (3), preferably equidistantly distributed.

6. The dispenser (1) according to claim 5, characterized in that The first rib (24) is axially spaced apart from the second rib (25), at least in the raised position of the dispensing head (9).

7. Dispenser (1) according to claim 5 or 6, characterized in that Each of the first ribs (24) alternates angularly with a pair of second ribs (25), or wherein, Each of the second ribs (25) alternates angularly with a pair of first ribs (24).

8. Dispenser (1) according to any one of the preceding claims, characterized in that The accordion-like deformable element (6) is configured to elastically maintain a stable configuration corresponding to a raised position of the lower tubular portion (11) which adopts a lowered position in the first annular space (12) after the dispensing head (9) has been lowered.

9. The dispenser (1) according to claim 8, characterized in that The dispensing head (9) comprises one or more axial protrusions (23) extending axially in the metering chamber (8) and configured to contact the accordion-shaped deformable element (6) and transmit a flattening force from the dispensing head (9) to the lower tubular portion (11) to facilitate the lower tubular portion (11) to reach the lowered position.

10. Dispenser (1) according to any one of the preceding claims, characterized in that The formation of the fluid-tight seal and of at least one channel for compensating air flow is independent of the angular position adopted by the dispenser head (9) relative to the ring nut (2).

11. The dispenser (1) according to any one of claims 1 to 8, characterized in that The dispensing head (9) is connected to the ring nut (2) by means of a ring (19) and is connected to the accordion-shaped deformable element (6) at the bottom, the ring being configured to define a locking system together with the ring nut (2), the locking system being designed to define an operative configuration and a non-operative configuration in which the dispenser (1) can or cannot be actuated to dispense the fluid drawn from the bottle, respectively, preferably the operative configuration and the non-operative configuration can be switched by means of a rotation of the ring (19).

12. Dispenser (1) according to claim 11, characterized in that The ring (9) comprises one or more axial protrusions (23) extending axially in the metering chamber (8) and configured to contact the accordion-shaped deformable element (6) and transmit a flattening force from the dispensing head (9) to the lower tubular portion (11) to facilitate the lower tubular portion (11) to reach the lowered position.

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