MX2008009495A - Squeeze foamer - Google Patents

Abstract

The invention relates to a dispensing device for dispensing a foam, comprising a manually compressible container (2) for storing a liquid and air, which container comprises an opening (3), a rigid housing (4, 5) to be fitted in or on the opening, the housing comprising an air passage (11, 12) and a liquid passage (9), which are in communication with a dispensing passage (14) which ends in a dispensing opening (8), and a valve body (6) which, in a rest position, covers a mouth of the liquid passage and a mouth of the air passage (10) in a sealing manner in order to prevent a flow from the liquid passage and the air passage to the dispensing passage, and which, during dispensing, opens the mouth of the liquid passage and the mouth of the air passage in order to allow mixing of air and liquid to take place in the dispensing passage. The invention is characterized in that the elastic valve body comprises an arcuate section (6c), which arcuate section extends in the mouth of the liquid passage in such a way that, initially, due to the liquid pressure in the liquid passage on the valve body, the arcuate section improves the sealing of the mouth of the liquid passage.

Description

EXPRESSABLE FOAMER DESCRIPTIVE MEMORY This invention relates to a dispensing device for supplying a foam and foam forming assembly to form a foam. More particularly, the invention relates to a squeezable skimmer without pumps. US 5,037,006 discloses a dispensing device for supplying a foam. This known dispensing device comprises a manually compressible container for storing a liquid and air. The container comprises an opening in which a housing is adjusted. In this housing, a liquid duct and an air duct are placed which, during delivery, are in communication with a dispensing duct which terminates in a dispensing opening. The dispensing device further comprises a valve body which, in a position at rest, seals a nozzle of a liquid conduit and a nozzle of the air conduit. The valve body is a flexible disc-shaped element which is supported on the circumference and is pressed against the nozzles of the liquid conduit and the air duct by means of a spring. When compressing / squeezing the container, the pressure in the container increases and therefore the pressure in the liquid conduit and in the air. As a result of this elevated pressure, the valve body in the nozzles of the air duct and the liquid duct is broken and an air stream from the air duct and a stream from the liquid duct is joined in the dispensing duct. In the dispensing conduit, the mixture of liquid and air passes through a number of sieves to create a foam, which is supplied by the dispensing aperture. After a container has been squeezed, the container will essentially return to its original state, either by elasticity of the container itself or by means of the recovery means that are provided to return the container to its original state. A disadvantage of the known dispensing device is the fact that the mixture of air and liquid is not optimal, as a result whose foam quality is not satisfactory. In addition, the structure of the known dispensing device is complex and comprises many components, which make the production complicated. In addition, the air conduit and the liquid conduit are flexible, as a result of which the velocity of the liquid and water flow decreases which therefore also leads to a reduction in the quality of the foam. Further, a disadvantage of the known dispensing device is that when the dispensing device is held with its dispensing opening down, the pressure of the liquid column can push the valve body from the liquid conduit nozzle so that the liquid can spill out of the liquid. dispensing device. On the device Known dispenser has proposed to use a spring with which the valve body is pressed against the nozzle of the liquid conduit to prevent this spill. This has the disadvantage that another part has been used. With which, there is a possibility of a spill when the force with which the spring is pressed against the nozzle is not sufficient. In contrast, when the force exerted by the spring is relatively large to obtain sufficient sealing, the force required for opening the valve body will also be relatively large. It is an object of this invention to provide a dispensing device for supplying a foam which solves one or more of the aforementioned disadvantages. The invention provides a dispensing device characterized in that the elastic valve body comprises an arcuate section, which extends in the nozzle of the liquid conduit in such a way that, initially, due to the pressure of the liquid in the liquid conduit in the body of valve, the arched section improves the sealing of the nozzle of the liquid conduit. Such an embodiment is advantageous since in the rest position of the dispensing device, a certain pressure is exerted on the valve body by the column of liquid which is on the valve body. In the invention, this pressure is used to improve the sealing of the liquid conduit nozzle in the idle position when the dispensing aperture is pointing downward.

In one embodiment, the arcuate section of the valve body comprises an upper portion that is closer to one edge of the nozzle in which it extends than to the other edge. Due to this shape, a better sealing of the valve body at the edge is obtained as a result of the pressure that has been exerted on the arched section. In the embodiment, the arched section comprises a second upper part that is closer to the other edge of the nozzle. In this mode, the arched section may have a cross section similar to the back of the two-humped camel ("Bactrian camel"). In such modality, a better seal is obtained on both opposite edges of the nozzle. Such an embodiment may be particularly advantageous in a dispensing device having an annular nozzle, wherein the valve body portion (s) is also annular. In one embodiment, the air duct nozzle and liquid duct nozzle are substantially annular and are positioned substantially concentrically with respect to each other. By making the nozzle of the air duct and the liquid duct of an annular design, the quantity of liquid to be supplied and the air to be mixed with the latter is distributed over a large surface area as possible. While the two annular nozzles are positioned substantially concentrically with respect to each other, an improved mixing between the liquid and air stream is obtained.

In this regard it is noted that the annular nozzle of the liquid conduit and / or air conduit may be formed by a substantially annular nozzle or by a number of openings which are arranged in a circle. In one embodiment, the diameter of the annular nozzle of the liquid conduit is greater than the diameter of the annular nozzle of the air conduit. As a result thereof, the liquid, which flows from the annular nozzle of the liquid conduit, will flow through the annular nozzle of the air duct when the foam is supplied and good mixing will be achieved. In one embodiment, the valve body is substantially conical. The term conical is understood as the valve body which is of a substantially circular-symmetrical design and which, in the direction of the central axis of symmetry, the diameter is larger at one end of the valve body than the other end of the valve body . The diameter can decrease greatly over the total length, but it can also increase or remain constant over the part of the length of the conical shape. In one embodiment, the valve body is at least partially made of a flexible, preferably elastic material, for example silicone. In making the valve body of a flexible material, there is no need to install any other moving component in the dispensing device to provide the valve function of the valve body. When using an elastic material, the valve body will return to its resting position after a foam has been supplied as a result of that the container has been squeezed. However, this return movement can also be performed in any suitable way, for example by using a spring element or by pre-tensioning the valve body. In one embodiment, the housing is substantially circular-symmetrical about a central axis and / or the liquid that is to be supplied during delivery, moves in a direction relative to the longitudinal direction of the housing. In such an embodiment, the liquid does not have to follow complicated flow paths in which the main direction of the liquid is reversed twice or more. This also allows a relatively simple construction of the dispensing device. The foam forming assembly according to the invention can advantageously be applied in a squeezable skimmer comprising a manually compressible container for storing a liquid and air, the foam forming assembly can be mounted in an opening of said container. In alternative embodiments of dispensing devices for supplying a foam, a foam forming assembly according to the invention can be placed in or on a container holding a liquid and gas under pressure, for example on a container with a foamable liquid and a propellant. Also, the foam forming assembly can be combined with any other device which can provide a foamable liquid and a gas under pressure, for example a device having a liquid pump and an air pump or a device that has a liquid supply and an air supply which are continuously under pressure. The invention will be explained in more detail below by means of an exemplary embodiment in which reference is made to the accompanying drawing in which: Figure 1 shows a cross section of a first embodiment of a dispensing device according to the invention; Figure 2 shows a part of the dispensing device of Figure 1 in more detail; Figure 3a shows a cross section of a second embodiment of a dispensing device according to the invention; Figure 3b shows a part of the dispensing device of figure 3a in more detail; Figure 4 shows a top view of the first housing part of the embodiment of figure 3; and Figure 5 shows a top view of the third housing part of the embodiment of Figure 3. Figures 1 and 2 show a first embodiment of a dispensing device according to the invention. The dispensing device is marked with the reference number 1. The dispensing device 1 is one of the squeezable skimmer type. Such a squeezable skimmer generally supplies a foam through a dispensing opening as a result of a container that has been squeezed.

After it has been squeezed, the container will return to its original state, either by the elasticity of the container itself or by the means of recovery which are provided to return the container to its original state. The foam may be formed using the dispensing device 1 may be suitable for several different uses such as for example a soap, shampoo, shaving foam, dishwasher, suntan lotion, after tanning lotion, washing liquid, care products skin and the like. The dispensing device is shown in the rest position, ie the container has not been squeezed. Such a squeezable frother can be operated by hand. However, it is also possible to push the container when using a device intended for the purpose. The illustrated squeezable frother can be held in one hand during delivery. It is also possible to install it or a similar dispensing device in a support which is to be fixed, for example to the wall, similar to the support, which can, for example, be found in public bathrooms. The dispensing device 1 comprises a manually compressible container 2 containing a liquid and an air. The container has an opening 3 in which a foam forming assembly is fitted. The container 2 may have any suitable shape, for example a shape having a circular elliptical or transverse section.

The foam-forming assembly is substantially circular-symmetrical about a central axis of symmetry A-A. The foam forming assembly comprises a housing with a first housing part 4 and a second housing part 5. The second housing part 5 is attached to the container 2 by means of a threaded connection, the first housing part 4 is embraced in a sealing manner between the container 2 and the second housing part 5. Alternatively, the second housing part 5 may be joined by means of an instantaneous connection such as a welded connection, a hermetic seal or another suitable connection in the container 2. In addition, the foam-forming assembly comprises a substantially conical valve body 6 which is embraced near the clamp section 6a between the first housing part 4 and the second housing part 5. The valve body 6 is made from a flexible material, preferably elastic. The silicone has proved to be a particularly suitable material for the valve body 6. In relation to the liquid, the air is placed in the upper part of the container 2. This liquid and this air can be converted into a foam by means of the dispensing device 1 which is supplied through a dispensing opening 8 in the sealing cap 7. To make possible the mixing of the liquid and the air, a liquid conduit is provided, which runs from the liquid in the container by means of an opening 9 in the first housing part 4 to an annular nozzle 10 (between the circular edges 4a and 4b) of the liquid conduit.

With respect to air, an air duct is provided which runs from the air in the upper part of the container 2 via the tube 11 to an annular nozzle 2 (between the circular edges 4a and 4c) of the air duct. In the rest position shown, both the annular nozzle 10 and the annular nozzle 2 are sealed by means of the valve body 6. When the two annular nozzles 10, 12 are open, ie they are not sealed by means of the valve body 6. , the liquid conduit and the air conduit are in communication with a dispensing conduit. The dispensing conduit runs through the central part of the valve body 6, in which a sieve element 13 with two small sieves 13a is placed, through a central opening 14 of the valve body 6 through the second part. 5 and the sealing cap 7 to the dispensing opening 8. As a rule, the air duct contains one or more air ducts which carry air to the container in fluid communication with a nozzle of the air duct which, in the resting position, it is covered by the valve body. The corresponding liquid conduit contains one or more liquid ducts which carry the liquid in the container in fluid communication with the nozzle of the liquid conduit which, in the rest position, is covered by the valve body. The annular nozzle 10 of the liquid duct, the annular nozzle 12 of the air duct and the dispensing duct are arranged substantially concentrically with respect to each other. The diameter of the annular nozzle 10 is in this case larger than the annular nozzle 12. Furthermore, the internal diameter of the central duct 14 in the valve body 6 is smaller than the diameter of each of the annular nozzles 10 and 11. Now, the valve body 6 will be mentioned in more detail. At point 6a, the valve body 6 is sealedly enclosed between the first housing part 4 and the second housing part 5. Furthermore, the valve body is retained by means of annular edges 4a and 4c against the conical surface 5a. In the rest position, for a better sealing along the circular edges 4a and 4c, the valve body 6 is adjusted with some axial pre-tension between the first housing part 4 and the second housing part 5. valve body 6 has an arcuate section 6c which is located at least partially in the annular nozzle 10 of the liquid conduit. This arched section 6c has the advantage that, as a result of the column of liquid in the container and the liquid conduit which, in the rest position, presses the valve body, an improved seal is obtained at point 4a . This is due to the fact that the arcuate section 6c is introduced as a result in which the sides of the arch are pushed sideways. As a result, the outer part of the arcuate section 6c is pushed towards the clamp 6a, and the inner part of the arcuate section 6c is pushed against the circular edge 4a as well as against the circular edge 4c which increases the sealing action.

In this case, it is particularly advantageous that the cross-section of the arcuate section 6c extending in the inner part of the annular nozzle 10 is not of a symmetrical design, but that an upper part of the arcuate section 6c is located relatively close to the edge 4a, that is to say that the upper part of the arcuate section 6c is closer to the edge 4a than to the edge 4b. As a result of this form, the arcuate section 6c under pressure of the liquid column in particular will press against the edge 4c, resulting in a better seal. While the annular nozzle 10 seals on the other side by the clamp in section 6a, the nozzle is efficiently sealed by means of the valve body 6 without requiring a greater clamping force. In an alternative embodiment in which the valve body 6 is not embraced to one of the sides of the nozzle, the upper part may be provided near both edges of the nozzle to achieve the advantage of the strong clamping effect of the arched section of the valve body at both edges. The cross section of the arched valve body section looks like the back of a camel, the two upper parts of the valve body represent the humps of the camel. On the side placed on the outside of the clamp section 6a, the valve body 6 has a sealing lip 6b which serves for an air inlet valve which allows air to enter the container 2 when a some reduced pressure in the container 2 as a result of the liquid in the container 2 to be supplied. He Sealing lip 6b normally seals the conduit of the container 2 towards the outside, but will allow an air flow from the outside towards the container 2 through the opening 15 when there is a reduced pressure in the container 2. The dispensing device 1 further comprises a sealing cap 7. With respect to the second housing part 5, this sealing cap 7 can be moved at least in an open position as shown in figures 1 and 2, and a closed position (towards the top in the drawing, in relation to the accommodation). In the closed position, a projection section 5b of the second housing part moves towards the dispensing opening 8 so that the foam can not be supplied through the dispensing opening 8. The air inlet duct which, by means of of the valve body 6b and the opening 15, leads to the interior of the container 2, is sealed when the sealing cap is placed in the closed position. The sealing cap 7 even has a number of fingers pointing upwards which engage with complementary fingers in the second housing part 5. These fingers form other seals in the closed position. Near its outer periphery, the first housing part 4 has a free projection lip 29 which extends obliquely in the direction of the container 2 and inwards (towards the center line A-A). This lip 29 serves as a sealing element for sealing the connection between the first housing part 4 and the container 2. Such a seal is also known as a crab claw, but it has not yet been used in a foam dispensing device, in particular not in a squeezable skimmer. When the container 2 is squeezed in the open position of the lid being sealed, the pressure in the container 2 will increase. Initially, the increased pressure will ensure that the arcuate section 6c of the valve body 6 is pressed more strongly against the annular rim 4, resulting in an improved seal between the valve body 6 and the annular rim 4a When the pressure in the container 2 further increase by compression of the latter, the arcuate section 6c will at some point be reduced, as a result of which it will detach from the annular edge 4a. This will lead to a liquid stream flowing through the space between the annular rim 4a and the valve body 6. As a result of the increased pressure in the container 2, the valve body 6 will subsequently also detach from the annular rim 4c making it possible for the air and liquid stream to flow between the annular rim 4c and the valve body 6. Here, the liquid will therefore mix with the air. Since both the liquid and the air will flow through a narrow circular space, a good mixture between the air and the liquid will result. This mixture of air and liquid will then flow through small sieves 13a which will produce a (improved) foam. This foam will flow down through the dispensing conduit to the dispensing opening where it will be delivered. The valve body 6 therefore as if they were rollers successively on the annular edges 4a and 4c during the supply as result of which liquid and air can flow through the dispensing conduit to the dispensing opening, creating a foam in the dispensing conduit. It has been found that this continuous effect is advantageous for forming a foam. A first advantage of the mode of the dispensing device 1 is that the annular nozzles of the liquid conduit and the air conduit distribute the liquid and the air over a relatively large surface resulting in a relatively good mixture. Incidentally, this advantage is also achieved when one or both annular nozzles extend over less than 360 ° or are subdivided into several openings, which together form an uninterrupted annular opening. Such modalities are within the scope of the protection of the invention. In an alternative modality, it is possible to design the rigid valve body and press or push it against the first housing part 4 using a spring element. When the pressure in the container is increased, the spring will compress or extend respectively creating a space between the valve body 6 and the second housing part 4. As a result, it will be possible to form and supply a foam. However, in such an embodiment the advantageous continuous effect described above will not happen. A second advantage of the embodiment of the dispensing device 1 is that as a result of the central opening 14 which is provided in the valve body, the liquid stream and / or the air stream They do not have to turn 90 degrees or more. By providing this opening 14, the liquid stream and the air stream can maintain their velocity, thereby resulting in a better mixture of liquid and air. In this case, it is further advantageous that the valve body 6 is designed to be substantially conical as a result of which the velocity of the liquid stream and the air stream is maintained even more effectively. In addition, the conical shape has the advantage that a screen element that aids the production of foam can be adjusted in the cone. When adjusted in the conical shape, the overall height of the housing is reduced. Generally, the illustrated embodiment of the dispensing device has the advantage that the liquid to be delivered moves in a direction relative to the direction of the central axis of symmetry as it is delivered. This is made possible by means of the specific construction of the dispensing device and aids in the production of a foam of the desired quality. A third advantage of the mode of the dispensing device 1 is that the arcuate section 6c of the valve body 6 supports the seal between the second housing part 4 and the valve body 6. As a result, a better seal is achieved in the rest position, ie when the container 2 it is not compressed, therefore the risk of the liquid leaking from the dispensing device is reduced. In addition, the arc section 6c creates a value of a pressure threshold in which the valve body detaches from the second housing part 4 ensuring an improved foam of constant quality.

Figure 3 (ie Figures 3a and 3b) shows a second embodiment of a squeegee skimmer according to the invention. This squeezed skimmer is generally constructed in accordance with the embodiment shown in Figures 1 and 2. Therefore, identical reference numerals have been used to substantially show the identical components of the squeezable skimmer. Furthermore, the above-described operation of the squeezable skimmer according to FIGS. 1 and 2 generally also applies to the embodiment of FIG. 3. The most important difference between the squeezable skimmer of FIGS. 1 and 2 and the squeezable skimmer of FIG. 3 is that the latter comprises a third housing part that is marked in Figure 3 by reference number 20. As a result of this additional housing part 20, the squeezable skimmer of Figure 3 has a number of added advantages , as will be described below. The third housing part 20 is embraced between the clamp section 6a in the valve body 6 and the first housing part 4. In this embodiment, the valve body 6 is therefore embraced between the second housing part 5 and the third housing part 20. The first housing part 4 comprises sleeves 4e / 4f, in which the openings 9a and 9b respectively are provided. These sleeves 4e / 4f are placed in an opening 24 of the third housing part in a sealed manner.

The liquid flowing through the opening 9a towards the annular nozzle 10 is not able to reach a space 21 which is located between the first housing part 4 and the third housing part 20. This space 21 connects the space 22 just on the air inlet valve 6b inside the vertical duct 1. As a result, the air entering through the air inlet valve 6b during aeration of the container 2 following the supply of a certain amount of liquid, will successively flow through the spaces 22 and 21 and through the vertical duct 11 in the upper section of the container 2. Compared with the embodiment of figures 1 and 2, air is prevented from passing through the liquid in the container 2 before the aeration of the container 2. The latter has the disadvantage that a foam can be formed in the container 2 while the air required to aerate the bottle flows through the liquid. By forming a space 21 using a third housing part 20, the production of foam in the container 2 during aeration is therefore avoided in a constructionally simple manner. In an alternative embodiment, it is possible, for example in the embodiment of FIGS. 1 and 2, to provide an air duct through the first housing part 4 or in the second housing part 5, whose air duct connects the valve of air intake with the interior of the vertical duct, so that the container can be drained without the air having to flow through the liquid in the container.

Another advantage of the squeezer skimmer embodiment of FIG. 3 is the fact that by providing the third housing part 20 it is possible in a simple manner to make the squeeze skimmer capable of supplying a foam with two or more air ratios. liquid as will be explained in more detail below. Figure 4 shows a top view of the first housing part 4. This first housing part 4 is substantially circular and comprises a central opening 23 surrounded by 6 openings, three openings 9a having a larger diameter than the other three openings 9b . While the foam is supplied and also during the aeration of the container 2, air will flow through the central opening 23. Depending on the desired air / liquid ratio, one or more of the openings 9a and 9b are provided to provide the liquid flow through them while the squeezable skimmer is operated. Figure 5 shows a top view of the third housing part 20. This third housing part 20 comprises three openings 24 which can be in line with the large openings 9a or the small openings 9b or the first housing part 4 depending on the rotation position in which the third housing part 20 is placed in the first housing part 4. The third housing part 20 further comprises three blind holes 25 which depending on the position of the first housing part 4 relative to the second housing part 20 will seal the large openings 9a or the small openings 9b.

Figure 3 clearly shows, on the left side, that the sleeve 4e of the first housing part 4, in which the opening 9a is provided, is placed in the sleeve in whose opening 24 is provided while the sleeve 4f, shown in FIG. the right side of the figure, in which the opening 9 is provided, the blind hole 25 is sealed. During the operation of the squeezable skimmer 1 the liquid will therefore only flow through the three large openings 9a. If the first housing part 4 and the third housing part 20 were rotated 60 ° with respect to each other, the openings 24 would align with the small openings 9a while the large openings 9a would be sealed by the blind holes 25. This could result in a smaller flow of liquid from the openings 9b during the operation of the squeeze skimmer, while the amount of air flowing through the vertical duct 1 1 as a result of the squeezing of the container 2 would remain virtually the same . Therefore, the air / liquid ratio will change depending on the rotational position of the first housing part 4 relative to the third housing part 20. It will be clear to the person skilled in the art that this construction offers many possibilities for changing the air / liquid ratio by varying the number of openings in the first housing part which are optionally sealed by means of a blind hole as well as by varying the size of the respective openings.

Another possibility for influencing the air / liquid ratio is by adjusting the smaller diameter of the air duct, for example by adjusting the inside diameter of the vertical duct 11 or by adjusting the diameter of the central opening 23 in the first part of the duct. 4. The options that have been given to adjust the air / liquid ratio can also be used to affect the total amount of foam that is formed when the container 2 is squeezed. In this invention of Figure 3, only two positions are possible: one as shown in Figure 3, wherein the liquid is supplied through three large openings 9a, and a position in which the first housing part is rotated by 60 ° in relation to the third housing part 20 in which the liquid is supplied through three small openings 9b. When several components of the squeezable skimmer 1 are fitted in the container 2, a choice will be made with respect to the position in which the first housing part could be adjusted with respect to the third housing part 20, for example depending on the liquid. Figure 5 further shows that the central section and the outer section of the third housing part 20 are connected to each other by means of bridge parts 26. These bridge parts 26 result in a nozzle 12 that is formed by three openings, These openings are placed in a ring shape. Such a modality of the nozzle 12, with several openings is estimated as a substantially annular nozzle with respect to the context of this patent application. An additional difference between the embodiment of Figure 3 and the embodiment of Figures 1 and 2 is that, in the embodiment of Figure 3, a second screen element 28 is provided comprising two small screens 28a. Depending on the foam to be formed and the liquid that will be used for this purpose, this second screen element 28 can be used to further affect the foam quality to be supplied. And in general, the provision of additional sieve elements will result in the foam being refined and also more homogeneous. Depending on the application, it is thus possible to choose one of the sieve elements 13, 28 or the combination thereof, it is also possible to modify the type of small sieve which is used in the respective sieve elements 13, 28 to achieve the application. In an alternative embodiment, the screen elements 13, 28 can also be designed as a screen element, half of this single screen element extends into the valve body. In a possible embodiment, one of the small screens is replaced by a small plate having one or more relatively small holes, giving the screen element the function of an expansion space. The above described embodiments of the squeezable skimmer have been described in a position where the lid points downwards. All references to the above and / or to the following are made in relation to this position. The dispensing device is designed to be used in this position. In this case, the sealing cap 7 is designed in such a way that the dispensing device can be held in this sealing cap 7 while the container 2, due to its convex upper part, is not suitable for holding on this upper part. However, it is possible to provide a mode in which the dispensing device can in fact be turned upside down (inverted with respect to the position shown) to supply the foam and / or be at rest. Such modalities are estimated within the scope of the protection of this invention. It will be clear to those skilled in the art that all the individual features that have been mentioned with respect to one or the aspects may also be applied in a manner according to one of other aspects of the invention. Such modalities are therefore estimated within the scope of the protection of the invention.

Claims (20)

NOVELTY OF THE INVENTION CLAIMS

1. - A dispensing device for supplying a foam comprising a manually compressible container for storing a liquid and air, a foam-forming assembly to be joined inside or on an opening in the container to form a foam, the foam-forming assembly comprises a housing having an air duct and a liquid duct, each of which terminates in a nozzle and is in communication with a dispensing duct which terminates in a dispensing opening, and a valve body which, in a position in rest, covers the liquid conduit nozzle and the air duct nozzle in a sealing manner to prevent a flow from the liquid conduit and from the air duct to the dispensing duct, and which, during delivery, opens the nozzle of the liquid conduit and the nozzle of the air duct to allow mixing of air and liquid passing in the dispensing duct, characterized in that the elastic valve body comprises an arcuate section, which extends into the nozzle of the liquid conduit in such a way that, initially, due to the pressure of the liquid in the liquid conduit in the valve body, the arcuate section improves the sealed in the nozzle of the liquid conduit.

2. - The dispensing device according to claim 1, further characterized in that an upper part of the arcuate section of the valve body is closer to one of the edges of the nozzle in which it extends than to the other edge.

3. The dispensing device according to claim 2, further characterized in that the arcuate section comprises a second upper part that is closer to the other mouth of the nozzle.

4. - The dispensing device according to claim 1, further characterized in that the nozzle in which the arcuate section extends is annular.

5. - The dispensing device according to claim 1, further characterized in that the valve body is substantially conical.

6. The dispensing device according to claim 1, further characterized in that the valve body comprises an edge that extends freely on all sides and which serves as a valve for an aeration opening in the housing to aerate the container .

7. The dispensing device according to claim 1, further characterized in that the nozzle of the air duct and the nozzle of the liquid duct are substantially annular and are placed substantially concentrically with respect to each other.

8. - The dispensing device according to claim 7, further characterized in that the diameter of the annular nozzle of the liquid conduit is greater than the diameter of the annular nozzle of the air conduit.

9. The dispensing device according to claim 7, further characterized in that the valve body comprising an annular clamp section with which the valve body is embraced in the housing, and wherein the diameter of the clamp is greater than the diameter of the annular nozzle of the liquid conduit and the annular nozzle of the air conduit.

10. The dispensing device according to claim 9, further characterized in that the dispensing conduit is positioned concentrically with respect to the annular nozzle of the liquid conduit and the air conduit.

11. The dispensing device according to claim 1, further characterized in that the valve body is elastic.

12. The dispensing device according to claim 1, further characterized in that the dispensing device is substantially circular-symmetrical about a central axis of symmetry and the liquid to be delivered, during delivery, moves in a direction relative to the direction of the central axis of symmetry.

13. - The dispensing device according to claim 1, further characterized in that the valve body is made of a silicone material.

14. - The dispensing device according to claim 1, further characterized in that the annular nozzle of the liquid conduit and / or the air conduit comprises an opening.

15. - The dispensing device according to claim 1, further characterized in that the annular nozzle of the liquid duct and / or the air duct comprises openings.

16. The dispensing device according to claim 1, further characterized in that the valve body is mounted with an axial pre-tension in the housing so that the valve body is pressed against the nozzle of the liquid conduit and the nozzle of the valve. air duct

17. The dispensing device according to claim 1 further characterized in that the dispensing device comprises a sealing cap which can be moved between an open position in which a foam can be supplied when the container is squeezed, and a closed position in which A dispensing opening is sealed.

18. A foam forming assembly for forming a foam comprising a housing having an air duct and a liquid duct, each of which terminates in a nozzle and is in communication with a dispensing duct which terminates in a opening dispenser, and a valve body which, in a position at rest, covers the liquid conduit nozzle and the air conduit nozzle in a sealing manner to prevent a flow of the liquid conduit and air passage from passing to the dispensing conduit, and which, during the supply, opens the nozzle of the liquid conduit and the nozzle of the air conduit to allow the mixing of air and liquid passing in the dispensing conduit, characterized in that the elastic valve body comprises an arcuate section that extends into the nozzle of the liquid conduit such that, initially, due to the pressure of the liquid in the liquid conduit in the valve body, the arcuate section improves the sealing of the liquid conduit nozzle .

19. - A dispensing device for supplying a foam comprising a foam forming assembly of claim 18 in which the liquid conduit and the air conduit are connected to a liquid source comprising a liquid under pressure and a gas source comprising a gas under pressure respectively.

20. - A dispensing device for supplying a foam comprising a foam-forming assembly of claim 18 in which the liquid conduit and the air conduit are in fluid communication with a container comprising a foamable liquid and a gas, in particular air, where the foamable liquid and the gas are pressurized or can be pressurized.