WO2014023748A1

WO2014023748A1 - Refillable device for producing foam

Info

Publication number: WO2014023748A1
Application number: PCT/EP2013/066511
Authority: WO
Inventors: Gérard Sannier; Francis Poizot
Original assignee: Sannier Gerard
Priority date: 2012-08-06
Filing date: 2013-08-06
Publication date: 2014-02-13
Also published as: EP2695677A1; FR2994109B1; EP2879806B1; FR2994109A1; EP2879806A1

Abstract

The present invention relates to a device for producing foam, including a foaming-liquid supply vessel (100) of variable capacity, a liquid chamber (2) communicating with the foaming-liquid supply vessel via an inlet (103), and with a mixing chamber (4) via an outlet (25), a first non-return valve (21, 22) arranged at the inlet (103) of the liquid chamber (2), a second non-return sealing valve (411, 412; 416), arranged at the liquid outlet (25), which enables an outgoing flow from the liquid chamber (2) and includes resilient means for keeping said valve in a closed position, an air chamber (3), a compression means (61) for compressing the air chamber (3) and the liquid chamber (2) in order to expel liquid and air, through the liquid outlet (25) and the air outlet (34), into the mixing chamber (4), which includes a stirring means (42) for producing foam (51) expelled toward an outlet (5), a return means (39) bringing the air chamber (3) and the liquid chamber (2) back in the non-compressed position thereof in order to perform air and liquid suction, the device being characterized in that the return means (39) is a smooth-walled, bell-shaped resilient and deformable part, which hermetically separates the liquid chamber (2) from the air chamber (3), using sealing means (391, 392).

Description

DEVICE FOR PRODUCING RECHARGEABLE FOAM

The invention relates to the field of manually operated foam producing devices operating on the basis of foaming and refillable liquid. It relates more particularly to a device that can be used in all positions, standing, lying down or turned over, to produce foam.

There are hand-operated foam producing devices for producing foam from foaming liquid. The patent application WO 2004/078359 and the patent EP 1 190 775 describe, for example, a type of manual device producing foam from a foaming liquid. However this type of foam producing device does not work properly in all positions. This type of device can not produce foam, for example, when the device is returned or that device is tilted horizontally and that its tank is emptied more than half.

The document FR 2 907 035 solves this problem by a foam production device comprising a foaming liquid supply tank of variable capacity, a liquid chamber communicating with the foaming liquid supply tank via an inlet opening. , and with a mixing chamber through a liquid outlet opening, a first non-return valve disposed at the inlet opening of the liquid chamber, a second non-return valve, disposed at the opening liquid outlet, allowing a flow out of the liquid chamber and comprising elastic means for holding in the closed position, an air chamber comprising at least one inlet with a third non-return valve allowing the supply of air from the outside and an air outlet opening communicating with the mixing chamber, gripping means for a user, to compress the air chamber and the chamber of liquid for the eye liquid and air, through the liquid outlet opening and through the air outlet opening, into the mixing chamber which includes brewing means for producing foam expelled to an outlet, a return spring returning the air chamber and the liquid chamber in their uncompressed position to achieve suction of air and liquid. But, this system has the disadvantage of being complex by a combination of two pistons. The plunger of the liquid chamber must be sealed to avoid contact with the air chamber. But, it is well known that a very frequent use of a piston can make a piston less and less hermetic.

The present invention aims to remedy one or more of the disadvantages of the prior art by providing a rechargeable foam production device, operated by hand and operating in all positions, simple and safe design.

This objective is achieved by a foam production device comprising:

a supply tank of foaming liquid, of variable capacity,

a liquid chamber communicating with the foaming liquid supply tank through an inlet opening, and with a mixing chamber through a liquid outlet opening,

a first non-return valve arranged at the inlet opening of the liquid chamber,

a second check non-return valve, arranged at the liquid outlet opening, allowing a flow coming out of the liquid chamber and comprising elastic means for holding in the closed position,

- an air chamber,

compression means for compressing the air chamber and the liquid chamber to expel liquid and air, through the liquid outlet opening and through the air outlet opening, into the chamber; mixture which comprises stirring means for producing expelled foam to an outlet,

a return means bringing back the air chamber and the liquid chamber in their uncompressed position to achieve suction of air and liquid,

RECTIFIED SHEET RULE 91 ISA / EP the device being characterized in that the biasing means is a resilient and deformable bell-shaped piece with a smooth wall and separates the liquid chamber and the air chamber hermetically by sealing means.

According to another feature, the air chamber further comprises at least one inlet with a third non-return valve for supplying air from outside and an air outlet opening communicating with the mixing chamber.

According to another feature, the second non-return sealing valve comprises a plastic boss that closes the outlet opening of the liquid, the boss being held by elastic tabs fixed to the mixing chamber, the stirring means comprising a thread or a porous element disposed downstream of the liquid outlet opening and the air outlet opening, with respect to a flow towards the expulsion port.

According to another feature, the second non-return sealing valve comprises a ball pushed against a frustoconical wall widening towards the ball and realizing the edges of the outlet of the liquid chamber, the ball being pushed by an elastic element in bearing against at least one bearing abutment of the mixing chamber.

According to another feature, the elastic element is made by a spring, the stirring means comprising a net or a porous element disposed downstream of the air outlet opening and the liquid outlet opening, by relative to a flow towards the expulsion orifice.

According to another feature, the elastic element is formed by a piece of elastic porous foam disposed downstream of the air outlet opening, with respect to a flow towards the expulsion orifice to achieve the stirring of air and foaming liquid.

According to another feature, the sealing check valve comprises a deformable portion to ensure a tight closure of the liquid outlet opening. According to another feature, the foaming liquid supply tank, of variable capacity, comprises a movable piston sliding sealingly abutting against an inner wall of the tank, the movable piston being disposed opposite the opening inlet of the liquid chamber.

According to another feature, the air chamber comprises two cylindrical walls centered around the same axis and joining by the bottom of the air chamber, a piston, in which are formed the inlet for the air supply and the air outlet opening, closing the air chamber and sliding along the axis of the air chamber, the piston of the air chamber being pushed towards the bottom of the air chamber by the action of the user on a protruding portion of the piston or the piston being remote from the bottom of the chamber by the action of the return means, the biasing means being arranged in the air chamber, resting on the bottom at the base of the bell.

According to another feature, the liquid chamber is disposed in the center of the air chamber, the liquid chamber corresponding to the space under the bell of the bell-shaped return means of the same axis as the air chamber and at the top of which is made the liquid outlet opening, the inlet opening of the liquid chamber being made at the base of the bell.

According to another feature, the air chamber comprises a plurality of air inlets, disposed at the periphery of the air chamber, and in front of which a diaphragm valve is held by supporting arms, in the chamber of air air.

According to another feature, the mixing chamber is adjacent to the liquid chamber, an air duct joining the outlet of the air chamber (3) to the mixing chamber, the expulsion orifice being disposed immediately in output of the brewing means.

In another feature, the sealing means comprises a lip formed at the periphery of larger diameter of the bell to press against a wall of the chamber around the liquid inlet. According to another feature, the bell comprises a rigid peripheral ring connected to the lip and bearing against the side walls of the air chamber.

According to another feature, the sealing means comprise a lip formed at the periphery of the largest diameter of the bell to fit into an annular groove formed on a wall around the liquid inlet.

According to another feature, the bell comprises a rigid peripheral ring connected to the lip and bearing against the wall around the liquid inlet.

According to another feature, the compression means comprise a tube mechanically and sealingly connected to a sleeve extending the weakest section of the bell, the sealing means comprising a fitting of the tube with a tubular portion of the bell less elastic than the rest of the bell.

Other features and advantages of the present invention will appear more clearly on reading the description below, made with reference to the accompanying drawings, in which:

FIG. 1 represents a sectional view of an example of a device for producing foam according to the invention;

- Figures 2 and 3 each show a sectional detail of a foam production device according to the invention;

FIG. 4 represents a perspective view of a sealing valve used in a foam production device according to the invention; - Figures 5 and 6 show a partial sectional view of an example of a foam production device according to the invention in the operating phase;

FIG. 7 represents a sectional view of another example of a device for producing foam.

The invention will be described with reference to the figures mentioned above. The foam producing device, as shown in the figures 1 and 7 comprises a reservoir (100) containing foaming liquid. The reservoir (100) is made, for example, inside a cylinder (101). Without limitation, the inner wall of the cylinder (101) is of round or oval cross section. A piston (102) of the same cross section is movable in the cylinder (101) and rests on the inner wall of the cylinder (101) sealingly. The reservoir comprises an opening (103), in a nonlimiting manner, vis-à-vis the piston (102), through which the liquid exits the reservoir (100). The liquid outlet through the opening (103) causes a translation of the piston (102) and a decrease in the volume of the reservoir (100). The piston (102) movable partially delimiting the reservoir (100) allows to have an adaptable capacity of the reservoir (100), the capacity being identical to the volume of foaming liquid contained. The more the foaming liquid is sucked through the opening (103), the more the piston (102) approaches the bottom of the cylinder to reduce the capacity of the reservoir (100). US Pat. No. 5,152,434 describes, for example, a pump that is not suitable for producing foam, equipped with a reservoir of this type. Without limitation, the piston (102) comprises on a face opposite the tank, a fastener (104) accessible from the outside of the foam producing device, for gripping the piston (102) during disassembly to fill the tank (100).

As the flow of fluid passing through the opening (103) of the tank (100) is made in the direction out of the tank (100), the tank (100), initially completely filled with a determined foaming liquid, contains only this liquid . The tank does not contain, for example, no air. In addition, the opening of the reservoir (100) is always fed with foaming liquid until the reservoir (100) has reached its minimum capacity, when the piston (102) advances to an abutment position, for example against the opening (103). When the piston (102) is in the stop position, the piston (102) is substantially in contact with the wall of the tank where the opening (103) is located.

A liquid chamber (2) with an inlet opening (103) and an outlet opening (25) communicates through its inlet opening (103) with the reservoir and communicates through its outlet opening (25) with a mixing chamber (4). The inlet opening (103) of the chamber (2) of liquid coincides with the opening of the reservoir.

A first nonreturn valve (21, 22) disposed at the inlet (103) of the chamber (2) of liquid prevents a flow of liquid returning to the reservoir (100).

A second non-return valve (41 1, 412) disposed at the outlet opening (25) of the liquid allows flow out of the liquid chamber (2) and comprises means (415, 413; 417) holding elastics in the closed position.

The second nonreturn valve (41 1, 412), as shown in FIGS. 1, 2, 5, 6 and 7, is produced, without limitation, by a ball (412) pushed by an element (413). , 415) elastic against a frustoconical wall (41 1) widening towards the ball (412). The ball (412) is for example made of plastic or glass, the wall (41 1) being, for example made of plastic. In a nonlimiting manner, the frustoconical wall (41 1) has a hardness determined to deform in contact with the ball (412).

The element (413, 415) elastic is for example in abutment against a ring (414) fixed support relative to the chamber (4) mixing. The elastic element is produced, in a nonlimiting manner, by an elastic porous foam (413) exerting a force for holding the ball (412) against the frustoconical wall as shown in FIG. 2. The porous foam (413) also carries out mixing the liquid with air to produce foam.

According to another exemplary embodiment, as represented in FIGS. 1, 5, 6 and 7, the elastic element is a spring (415) resting on the bearing ring (414) and against the ball (412), a thread (42) or a porous foam that can be disposed downstream of the ring (414), relative to the direction (5000) of expulsion, for stirring the foaming liquid with air and producing foam (51). The spring (415) is for example metal or plastic.

According to another embodiment, as shown in FIG.

3, the sealing valve comprises a boss (416) held in abutment against the outlet (25) of the chamber (2) of liquid, by arms (417). elastic. This valve (416, 417) shown in perspective in Figure 4, for example is held by its arms (417) pinched at their end, by pinching means of the foam producing device. In a nonlimiting manner, the boss (416) is elastic to plug the outlet opening (25) of the chamber (2) of liquid by deforming when inserted into the outlet opening (25).

A chamber (3) of air is for example made around the chamber (2) of liquid, as shown in Figures 1 and 7. The chamber (3) of air is formed by a cylinder (31) in which slides of sealingly a piston (32). The cylinder (31) of the air chamber (3) is, for example, arranged coaxially and around the cylinder (23) of the liquid chamber. The air chamber may include at least one inlet (33) with a third non-return valve for supplying air from outside the device and an air outlet opening (34) communicating with the chamber (4) mixing.

A return means (39) returns the air chamber (3) and the liquid chamber (2) to their uncompressed position for suction of air and liquid.

The return means (39) is a resilient, smooth-walled, bell-shaped, resilient piece which separates the liquid chamber (2) and the air chamber (3) hermetically by sealing means. For example, the biasing means (39) is a resilient and deformable piece in the form of a hemispherical or frustoconical bell.

The chamber (2) of liquid corresponds to the space under the means (39) of bell-shaped return of the same main axis as the chamber (3) of air. At the top of the bell is made the opening (25) of the liquid outlet. The inlet opening (103) of the liquid chamber (2) is formed on a surface (394) at the base of the bell.

Compression means (61) are provided for compressing the air chamber (3) and the liquid chamber (2) to expel liquid and air through the liquid outlet opening (25) and the air outlet. air outlet opening (34) in the mixing chamber (4). The mixing chamber (4) can comprising brewing means (42) for producing foam (51) expelled to an outlet (5).

The compression means (61) comprise a tube (180) mechanically and sealingly connected to a sleeve extending the weakest section of the bell. The sealing means (392) comprise a recess of the tube (180) with a tubular portion (395) of the bell. The portion (395) may be less resilient than the rest of the bell. This difference in elasticity may, for example, be achieved by a greater thickness of the wall of the tubular portion (395) relative to the thickness of the remainder of the bell or by some other more rigid material of the part (395). ) tubularly attached to the rest of the bell.

The base of the bell also includes sealing means (391) for sealing the chamber (2) of liquid from the air chamber (3).

In an example shown in FIG. 1, the sealing means (391) comprise a lip (391) formed at the periphery of larger diameter of the bell for pressing against a wall of the chamber around the liquid inlet (103). . The bell may further comprise a peripheral rigid ring (393) connected to the lip (391) and resting against the side walls of the air chamber (3).

In an example shown in FIG. 7, the sealing means (391) comprise a lip (391) formed at the periphery of the largest diameter of the bell to fit into an annular groove formed on a wall (394) around the liquid inlet (103) so that the liquid chamber (2) and the air chamber (3) are hermetically separated. The bell may further comprise a peripheral ring (393) connected to the lip (391) and resting against the wall (394) around the liquid inlet (103).

The piston (32) of the air chamber (3) is connected to the compression means (61) and to the tube (180) mechanically and sealingly connected to the sleeve extending the weakest section of the bell. When the compression means (61) are actuated by a descending movement (M1). The piston (32) of the chamber (3) of air is pushed towards the bottom of the cylinder (31) of the chamber (3) of air. The volume of the chamber (3) of air is reduced, the air then being removed from the air chamber. One or more air inlets (33), associated with a non-return valve, for example membrane (36) supported by arms (37), then clog automatically. A flow of air (3002) is expelled from the air chamber (3) through the outlet (s) (34) of the air chamber to the mixing chamber (4). The piston (32) of the chamber (3) of air being connected to the tube (180) mechanically connected and sealed to the sleeve of the bell, the bell of the means (39) of return is deformed, an overpressure to the inside the bell is created. This overpressure creates a blockage of the non-return valve (22) to plug the opening (103) of the inlet of the liquid chamber. A flow (2000) of liquid is then expelled through the outlet opening (25) of the chamber (2) of liquid, by pushing the valve disposed at the outlet (25) of the chamber (2) of liquid. The foaming liquid is then sprayed into the mixing chamber (4), as shown in FIG. 6. The valve disposed at the outlet of the chamber

(2) liquid comprises resilient means for holding in the closed position, sealing the outlet opening (25) of the chamber (2) of liquid as long as the pressure in the chamber (2) of liquid is insufficient for the liquid contained in the chamber (2) of liquid to push back the sealing valve.

. Thus, an overpressure is created at the same time in the room

(3) air and in the chamber (2) of liquid, when the user exerts pressure for example on the means (61) of compression. The diameter of the opening of the outlet (34) of the chamber (3) of air is, for example, sized relative to the outlet diameter (25) of the chamber (2) of liquid to achieve a mixture of air and foaming liquid product in a proportion determined.

Without limitation, the chamber (3) of air is disposed adjacent to the chamber (4) mixing, the outlet (34) of the chamber (3) of air opening directly into the mixing chamber (4), as shown in FIG.

According to another exemplary embodiment, the outlet (34) of the air chamber communicates with a duct (35) leading to the mixing chamber (4).

When the compression means (61) are not actuated or released, the bell-shaped return means (39) causes the piston (32) of the air chamber (3) and the tube (180) to rise upwards. linked to the sleeve of the bell. A depression is then created in the chamber (2) of liquid, creating a flow (1000) of liquid suction from the tank (100) and pushing the check valve (22) provided at the inlet (103) of the chamber (2), as shown in Figure 5. The non-return valve disposed at the inlet of the liquid chamber is, for example, a ball (22) resting against a widening frustoconical wall (21). towards the ball and forming the edges of the inlet opening (103) of the chamber (2) of liquid.

A depression is also created in the air chamber and a current

(3001) of incoming air pushes back the one or more check valves (36) of the air inlet (s) (33) of the air chamber. The air chamber then fills with air from outside the foam producing device. In a nonlimiting manner, the communication between the air chamber and the mixing chamber is left free. The air inlet (s) (33) of the air chamber (3) have in fact a cross section sufficient to supply the air chamber with a flow of air coming from the outside. Air can also pass through the orifice (5) and the mixing chamber (4) to enter the air chamber through the outlet (s) (34), although in practice this inflow of air is negligible.

A suction (3001) of air is created in the chamber (3) of air at the same time as a suction (1000) of foaming liquid in the chamber (2) of liquid, as shown in Figure 5. The expulsion of foaming liquid and air into the mixing chamber (4) allows stirring of the foaming liquid by the mixing element (42), as shown in FIG. Without limitation, as shown in FIG. 2, the foam produced by the stirring element (413) is directed in an expulsion conduit (6) to an orifice (5) for expulsion of the foam, or as shown in Figure 3, the foam produced by the brewing element (42) exits directly through the orifice (5) expulsion.

When the foam producing device is not activated, the sealing valve, at the outlet of the chamber (2) of liquid, prevents leakage in case of overturning. In addition, this sealing valve makes it possible to keep the foaming liquid safe from the air, certain product requiring to be kept out of the air. Preferably for products that react rapidly in contact with air, the expulsion orifice (5) is arranged against the stirring element (42), as shown in FIG. 3, to avoid storing foam in an expulsion duct (6) or to be able to rinse the mixing chamber (4) after use.

When the foam-producing device is activated, foaming liquid will always be present at the inlet (103) of the liquid chamber (2), regardless of the inclination of the foam-producing device. The reservoir of course provides foaming liquid in all positions, as long as the reservoir (100) is not emptied. In addition the sealing valve plugging the outlet opening (25) of the liquid chamber, prevents the defusing of the chamber (2) of liquid in case of reversal. Indeed if the user exerts a pressure to compress the liquid chamber and the air chamber, in the inverted position, the overpressure in the liquid chamber allows the expulsion (200) of foaming liquid in the chamber (4) of mixing, the elastic element (415) of the sealing valve then bringing the latter into its closed position, even if the user keeps the head of the foam production device in the depressed position.

The bell-shaped return means (39) may be made of an elastic material, including, for example, plastic or rubber. The domed part of the bell is flexible and deformable and tends naturally to a raised position in which the interior volume of the bell is maximum.

The bell acts as a means of return and hermetic separation between the chamber (2) of liquid and the chamber (3) of air. The smooth bell wall shape provides an effective biasing means and increased durability in contrast to a biasing means including folds such as accordion return means. Indeed, a very frequent use of the device can weaken the biasing means at the folds where the wall of the return means is weakened.

It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiments should be considered by way of illustration, but may be modified within the scope defined by the scope of the appended claims, and the invention should not be limited to the details given above.

RECTIFIED SHEET RULE 91 ISA / EP

Claims

A foam production device comprising:

a reservoir (100) for supplying foaming liquid, of variable capacity,

a chamber (2) of liquid communicating with the foaming liquid supply tank via an inlet opening (103), and with a mixing chamber (4) via an opening (25) for discharging the liquid,

a first non-return valve (21, 22) disposed at the inlet opening (103) of the chamber (2) of liquid,

a second check valve (41 1, 412; 416), arranged at the outlet opening (25) of the liquid, allowing a flow coming out of the chamber (2) of liquid and comprising means (415); 413; 417) holding elastics in the closed position,

- a chamber (3) of air,

compression means (61) for compressing the air chamber (3) and the liquid chamber (2) to expel liquid and air through the liquid outlet opening (25) and the air outlet opening (34) in the mixing chamber (4) which comprises stirring means (42) for producing foam (51) expelled to an outlet orifice (5),

- means (39) for returning the chamber (3) of air and the chamber

(2) liquid in their uncompressed position to achieve suction of air and liquid,

the device being characterized in that the return means (39) is a bell-shaped elastic and deformable piece with a smooth wall and separates the chamber (2) from the liquid and the air chamber (3) hermetically by means of sealing means (391, 392).

Foam production device according to claim 1, characterized in that the liquid chamber (2) corresponds to the space under the bell-shaped return means (39), the outlet opening (25) liquid being made at the top of the bell, the opening (103) of the inlet of the chamber (2) of liquid being formed on a surface (394) at the base of the bell, separating the reservoir from at least the liquid chamber.

3. Device for producing foam according to claim 1, characterized in that the air chamber (3) further comprises at least one inlet (33) with a third non-return valve for supplying air from the air. and an outlet opening (34) of air communicating with the mixing chamber (4).

4. Device for producing foam according to claim 1, characterized in that the second check valve comprises a plastic boss (416) which closes the outlet opening (25) of the liquid, the boss being maintained by elastic tabs (417) fixed to the mixing chamber (4), the stirring means comprising a thread (42) or a porous element disposed downstream of the outlet opening (25) of the liquid and the opening of the outlet (34) of the air, with respect to a flow towards the expulsion orifice (5).

5. Device for producing foam according to claim 1, characterized in that the second check valve comprises a ball (412) thrust against a frustoconical wall (41 1) widening towards the ball and forming the edges the outlet (25) of the chamber (2) of liquid, the ball being pushed by an elastic member (415, 413) bearing against at least one abutment (414) of support of the chamber (4) mixing.

6. Foam production device according to claim 5, characterized in that the elastic element is made by a spring (415), the stirring means comprising a thread (42) or a porous element disposed downstream of the opening outlet (34) of the air and the outlet opening (25) of the liquid, with respect to a flow towards the orifice (5) of expulsion.

Foam production device according to claim 5, characterized in that the elastic element is formed by a piece (413) of elastic porous foam disposed downstream of the outlet opening (34) of the air, with respect to a flow towards the orifice (5) of expulsion to achieve the mixing of air and foaming liquid.

8. Device for producing foam according to one of claims 1 to 6, characterized in that the check valve comprises a deformable portion to ensure a tight closure of the opening (25) of the liquid outlet.

9. Device for producing foam according to one of claims 1 to 8, characterized in that the foaming liquid supply tank, of variable capacity, comprises a piston (102) movable sealingly sliding against an inner wall of the reservoir, the movable piston being arranged vis-à-vis the inlet opening (103) of the chamber (2) of liquid.

10. Device for producing foam according to one of claims 1 to 9, characterized in that the air chamber (3) comprises two cylindrical walls centered around the same axis and joining by the bottom of the air chamber. , a piston (32), in which are formed the inlet (33) for supplying air and the opening (34) for air outlet, closing the air chamber (3) and sliding according to the the axis of the air chamber, the piston (32) of the air chamber being pushed towards the bottom of the air chamber by the action of the user on a protruding part (61) of the piston or the piston being remote from the bottom of the chamber by the action of the means (39) of return, the means (39) of return being disposed in the air chamber, resting on the bottom at the base of the bell.

1 1. Device for producing foam according to claim 10, characterized in that the chamber (2) of liquid is disposed in the center of the chamber (3) of air, the chamber (2) of liquid corresponding to the space under the bell of the bell-shaped return means (39) having the same axis as the air chamber (3) and at the top of which the outlet opening (25) of the liquid is formed, the inlet opening (103) of the chamber (2) of liquid being made at the base of the bell.

Foam production device according to one of Claims 1 to 11, characterized in that the air chamber (3) comprises a plurality of air inlets (33) arranged at the periphery of the air chamber. , and in front of which a diaphragm valve (36) is held by support arms (37) in the air chamber (3).

Foam production device according to one of claims 1 to 12, characterized in that the mixing chamber (4) is adjacent to the liquid chamber (2), an air duct (35) joining the outlet (34). ) of the chamber (3) of air to the mixing chamber (4), the orifice (5) of expulsion being disposed immediately at the outlet of the means (42) stirring.

Foam producing device according to claim 1, characterized in that the sealing means (391) comprise a lip (391) formed at the periphery of a larger diameter of the bell for pressing against a wall (394) of the chamber around the liquid inlet (103).

15. Device for producing foam according to claim 14, characterized in that the bell comprises a ring (393) rigid peripheral connected to the lip (391) and bearing against the side walls of the chamber (3) of air.

16. Device for producing foam according to claim 1, characterized in that the sealing means comprises a lip (22) formed at the periphery of the largest diameter of the bell to fit into an annular groove formed on a wall (394) around the liquid inlet (103).

Foam production device according to claim 14, characterized in that the bell comprises a peripheral rigid ring (393) connected to the lip (391) and resting against the wall (394) around the liquid inlet ( 103).

Foam production device according to claim 1, characterized in that the compression means (61) comprise a tube (180) mechanically and sealingly connected to a sleeve extending the weakest section of the bell, the sealing means (392) comprising a recess of the tube (180) with a tubular portion (395) of the bell less elastic than the rest of the bell.