HK1182051A - Dispensing module - Google Patents

Description

Dispensing module

Technical Field

The invention relates to a dispensing module (Abgabemodul) for two fluid products, comprising:

a first chamber with a first wall, wherein the first chamber has a first opening,

a first piston movable in abutment against a wall of the first chamber,

a second piston movable in abutment against a wall of the second chamber,

wherein a coupling (Kopplungsmittel) is provided for coupling the two pistons during product dispensing (Produktabgabe), wherein the dispensing module has a second chamber, the second piston being movable in abutment at its wall, wherein the second chamber has a second opening.

Background

A fluid product is understood in the present application to be all products which can be emitted via the dispensing module, i.e. products which are still pasty or gaseous and solids dispersed in a gas.

It is often necessary to separate the two products contained in the container until the moment of their utilization, in order to avoid, for example, undesired chemical reactions between the products. In such a case, the two products are held in two chambers of a container that are separate from each other and delivered via a two-way valve or a two-way pump (zweiwegepump) to a dispensing opening (abbabe ribbon) where they are in contact with each other.

If two bags are provided for the two products, as in document WO 2007/132017 a1, it is difficult to transport the two products in a uniformly defined ratio of amounts. This may be problematic, for example, for pharmaceuticals (Arzneimittel) or for adhesives.

Dual piston systems are also known. From DE 202007004662U 1 a container with two pistons is known, which are arranged one above the other and slide along at the wall of the container. A two-way pump is arranged on the container. The first passage (Weg) of the pump opens at the upper end of the container. The second passage opens into a conduit which traverses the first piston and along which the first piston is slidable. The first product is located in the space above the first piston and the second product is located in the space between the first and second pistons. The risk of not being able to transport the two products in sufficiently precise quantitative ratios in the plant is also relatively great.

This disadvantage is avoided in that the two pistons are mechanically coupled to one another, so that when one piston moves, the other piston is correspondingly moved together. This solution is known from document US 3,915,345 a or document DE 2007199A. In both cases, a central cylinder is present, which is attached to the two-way valve. It is fixed at the same cylindrical housing. The first piston slides along the inner wall of the central cylinder and thus forms a first chamber, while the annular second piston slides with its central edge along the outer wall of the central cylinder and with its outer edge along the wall of the housing and thus a second chamber. The two pistons are connected to each other. In the case of document U S3,915,345 a, they are connected by a double wall that surrounds the edge of the lower part of the central cylinder. In a first exemplary embodiment of DE 2007199A, the two pistons are separated by a ring-shaped chamber and are connected at their lower ends via a base plate. The motive gas (Treibgas) necessary to move the two pistons together is located below the bottom plate or below the pistons.

In document DE 202007004662U 1 as well as in document DE 2007199A or document US 3,915,345 a, one of the pistons slides along the inside of the container. The container must therefore be designed to be cylindrical, so that a free choice of shape is not possible. Furthermore, there is the risk that the container deforms on impact. This is no problem if the deformation is in the part below the piston arranged at the smallest face. However, if the deformation is in an area that must be traversed by one of the pistons, the probability of a functional failure (functionalization) is greater. The piston cannot undergo deformation and therefore cannot emit product, or the piston can undergo deformation, but is deformed here, wherein leaks are caused and product is discharged into the region defined for the motive gas.

Disclosure of Invention

The object of the invention is therefore to avoid functional failures in the case of container deformations and to make possible a free choice of container shape.

This object is achieved in that the coupling has a part which connects the first piston to the second piston, wherein the first piston, the part and the second piston form a piston unit, wherein the first chamber is of annular design and is delimited in its central region by the part of the piston unit, and wherein the second chamber is arranged concentrically to and above the first chamber, and the first piston and/or the second piston has a piston head which is initially separate from the coupling and is irreversibly connected to the coupling after filling the dispensing module with product.

The first and second walls are preferably of cylindrical design, wherein, however, other designs are also conceivable, for example walls with an elliptical cross section.

By means of the solution according to the invention, it is achieved that the deformation of the container when using a dispensing module in the container with suitable dispensing means no longer causes a malfunction of the dispensing module. Furthermore, the outer shape of the container can be freely chosen, which enables it to be designed in a user-friendly way by improving the Griffigkeit or its ergonomics.

Typically, a piston system has a product pressure in the chamber (produktdlock) and a gas pressure below the piston. It is now decisive for the extraction (ausbrining) and evacuation (endreenung) of this piston system of the prior art that the gas pressure is higher than the product pressure. Another aspect is maintaining product consistency (Produktkonsistenz) or homogeneity. In particular for product mixtures (Produktmischung), in which liquefied or compressed gas is released, the gas is depressurized or separated in the chamber at a higher product pressure than the gas pressure and thus leads to undesirable product changes. The solution according to the invention, however, allows for emptying and for maintaining the homogeneity of the product composition (Produktformulierung) even when the smaller product chamber has a higher pressure than the external gas pressure, by means of the structural design of the piston system. This is achieved by the larger face pressure of the larger piston against the smaller piston.

One configuration of the invention is that the coupling element traverses the first chamber and that the side of the first piston facing away from the opening of the first chamber is in contact with the side of the second piston facing away from the opening of the second chamber.

In the scope of the invention, a fixing is provided in order to couple the dispensing module at the extraction means (entnahmemitel) or the part for closing the opening of the chamber.

The part connecting the first piston to the second piston is preferably of cylindrical design, wherein other designs are basically conceivable here corresponding to the design of the wall.

It is also expedient to provide a removal device which is in connection with the opening of the chamber.

In this connection, it is advantageous if the removal device comprises a two-way valve or a two-way pump, wherein the first passage is connected to the opening of the first chamber and the second passage is connected to the opening of the second chamber.

According to the invention, the removal device also comprises a dosing device.

It is also advantageous to provide a closure member (Schlie beta mittel) to close the openings of the first and second chambers, wherein the closure member has an open and a closed position.

Finally, it is provided within the scope of the invention that a housing is provided which is fastened to the dispensing module or to the removal device or to the closure.

Drawings

Embodiments of the present invention are explained next based on the drawings. Wherein:

FIG. 1 shows an exploded view of a dispensing module according to the present invention;

FIG. 2 shows a cut-away side view of the container during assembly;

fig. 3 shows a cut-away side view of the container according to fig. 2, which container can be filled;

fig. 4 shows a cut-away side view of the container according to fig. 2, in which the first product is filled into the first chamber;

fig. 5 shows a cut-away side view of the container according to fig. 2 after the second product has been filled into the second chamber;

figure 6 shows a cut-away side view of the container according to figure 2 after emptying;

FIG. 7 shows a perspective view of a cut-away of the housing;

FIG. 8 shows a perspective view of the inner shell in section;

fig. 9 shows a cut-away perspective illustration of the piston unit;

FIG. 10 shows a cut-away perspective illustration of a head of a second piston;

FIG. 11 shows a cut-away perspective illustration of a stop for the first piston;

FIG. 12 shows an enlarged illustration of the valve housing.

Detailed Description

The invention relates to a dispensing module (1) with two chambers (20, 30), which is fixed at a valve (4) of a container (5), preferably a pressure container. Each chamber (20, 30) is provided with a piston (61, 64 and 7). A coupling is provided to couple the two pistons (61, 64 and 7) to each other after filling the chamber so that they move simultaneously. The valve (4) is preferably a two-way valve, so that the product contained in the first chamber (20) is brought into contact with the product from the second chamber (30) upon exit from the valve (4) or possibly upon exit from an outlet fixed at the valve (4).

The invention also relates to a dispensing module (1) fixed to the valve (4) and to a container formed by the valve (4), the valve (4) being provided with the dispensing module (1) and being fixed to the housing (5).

The dispensing module (1) essentially comprises: a housing (2), wherein a first piston (61) slides in a part (21) of the housing (2) and forms a first chamber (20); an inner housing (3) in which second pistons (64 and 7) slide and form a second chamber (30); a coupling member (62) to couple the two pistons (61, 64 and 7) to each other; and a retaining means (8) to act as a stop for the first piston (61).

The housing (2) is composed of a first lower columnar member (21) and a second upper columnar member (22) having a smaller diameter. The two cylindrical parts are connected to each other by a radial connecting wall (23). In the illustrated exemplary embodiment, the wall of the second cylindrical part penetrates (Durchdringung) the radial wall (23) and slightly penetrates into the upper part of the first cylindrical part (21). The projection (25) serves as an upper stop for the first piston (61). However, it is also possible to remove the projection and use the radial wall as a stop. The second cylindrical part (22) has, in its upper region, an annular, radial shoulder (26) which is penetrated by one or more openings (261). This achieves that the first housing (Mantel) is tubular at both ends and is formed with an opening. The channel (24) is arranged at the inner side of the second cylindrical member (22). Which extends over the entire height of the second part (22). The upper side of the second cylinder part is provided with a fastening element (27) by means of which the two-chamber dispensing module (1) is fastened to the two-way valve (4). The fixing element (27) comprises a crown (Krone) which is provided with a catch (rastmitel) which can co-act with a complementary catch at the two-way valve (4).

The inner shell (3) is essentially formed by a cylindrical main part (31), the outer diameter of which corresponds approximately to the inner diameter of the second cylindrical part (22) of the outer shell (2). The cylindrical main part (31) tapers in the region of its upper part, preferably by means of which a truncated-pyramid-shaped wall (32) is formed and ends with a cylindrical part which forms a sleeve (Muffe) (33). Like the outer shell (2), the inner shell also has a tubular shape with openings at both ends. The sleeve (33) has an annular radial groove (331) which is open towards the outside and whose base diameter and height correspond to the inner diameter and height of the annular shoulder (26) of the second cylindrical part (22) of the housing (2). The inner shell (3) can thus be introduced into the interior of the upper cylindrical wall (22) of the outer shell (2) until the sleeve (33) engages in the opening in the center of the annular shoulder (26) and the shoulder (26) engages in the groove (331). The inner shell (3) is in this way firmly fixed in the interior of the outer shell (2). The length of the inner shell (3) is selected such that the lower end is oriented onto the lower end of a column part (22) of the upper part of the outer shell (2) in a position in which it snaps into the outer shell (2). The inner shell (3) is intended to define, with a passage (24), a discharge line (austritsleitung) for the product contained in the first chamber (20). For this purpose, the channel (24) is dimensioned such that it opens into a space arranged above the truncated-pyramid-shaped wall (32), but below the annular shoulder (26).

The two pistons are combined to form a piston unit (6). The first piston has a radial annular member (61) fixed at the lower end of a cylindrical member (62). The radial annular part (61) has an axial rim (Kranz) (63) at its edge, which extends from the side of the annular part (61) facing away from the cylindrical part (62). The rim (63) has an outer diameter corresponding to the inner diameter of the first cylindrical part (21) of the housing. The rim (63) is provided with a seal to seal the piston (61) against the inside of the lower part (21) of the housing (2). The seal is designed, for example, as a flowable, highly viscous seal in the form of a sliding glue (Gleitgel) or as a sealing lip (631), which is made of an elastomeric material, for example. The outer diameter of the cylindrical part (62) of the piston unit (6) corresponds approximately to the inner diameter of the inner housing (3).

In this way, the first chamber (20) is formed by an annular space between, on the one hand, the cylindrical lower part (21) of the housing and the cylindrical part (62) of the piston unit and, on the other hand, the first piston (61) and a radial part (23) of the housing, the radial part (23) connecting the lower part (21) with the upper part (22). The first chamber (20) is open towards the outside via a channel (24), a space between a truncated-pyramid-shaped part (32) of the inner shell and a shoulder (26) of the outer shell, and an opening (261).

An annular groove (611) is present in the first piston (61) at the connection with the cylindrical part (62). The annular groove (611) has a shape complementary to the shape of the projection (25) of the housing (2).

The first piston (61) is slidable in the interior of a lower cylindrical member (21) of the housing (2). In order to prevent it from sliding out of it, it is provided that the retaining means (8) is fixed at its lower end after all components of the dispensing module (1) have been introduced into the housing (2). The retaining means (8) is designed as an axial rim (81) whose inner diameter corresponds approximately to the outer diameter of the lower cylindrical part (21) of the housing. The axial rim (81) extends in its lower region via an annular radial wall (82) toward the center. The retaining means (8) is fixed at the lower end of the lower part (21) of the housing (2), for example by means of a catch. The piston (61) can thus be moved between a first position in which it strikes against the radial wall (23) of the housing (2) (see fig. 3) and a second position in which its lower rim (63) strikes against the annular wall (82) of the retaining means (8) (see fig. 4).

The second piston (64) is formed by the upper side (64) of the columnar member (62) of the piston unit (6). The cylindrical part (62) thus acts as a coupling which enables the two pistons (61) and (64) to be moved simultaneously.

In the embodiment shown here, the piston head (7) is fixed at the upper side (64). However, it is equally possible to form the piston head directly in one piece on the upper side.

The piston head (7) is formed primarily by a radial annular wall (71) which is extended downwardly past the rim (72). The seal is provided at the outer side of the rim in the form of a sealing lip (721). The outer diameter of the rim (72) corresponds to the inner diameter of the cylindrical main part (31) of the inner housing (3).

The second chamber (30) is thus defined by the space between the inner side of the inner shell (3) on the one hand and its truncated pyramidal part (32) and the piston (64 or 7) on the other hand. Which opens out in the region of the opening in the upper part of the sleeve (33). The head (7) of the piston (64) also acts as a sealing ring for the upper part of the first chamber (20).

The head (7) of the piston (64) is provided with a catch (722) which allows it to be irreversibly caught at a complementary catch (641) arranged at the upper side (64) of the piston unit (6). These catch elements (641, 722) are dimensioned in such a way that a sufficiently strong pressure must be exerted on the piston head (7) so that it catches on the upper side (64) of the piston; and preferably one or more latching elements are provided, which can compensate for possible filling tolerances. This prevents undesired latching, in particular during storage or during handling of an empty dispensing module. Furthermore, the height of the cylindrical main part (31) of the inner housing (and thus of the cylindrical part (22) of the upper part of the outer housing) is selected such that when the piston unit (6) is in the upper position (in which the first piston (61) impinges on the radial connecting wall (23)), there is sufficient space in the interior of the inner housing for the cylindrical part (62) and the released, unblocked piston head (7).

During assembly, the inner housing is first fixed in the outer housing, the piston head (7) is introduced into the interior of the inner housing (3), and then the piston unit (6) is introduced, wherein it is pushed in as far as possible, that is to say until the first piston (61) strikes the connecting wall (23). In this position, the piston head (7) is located above the upper part of the piston unit (6) without being jammed therein. The seals (631, 721) of the two pistons (61, 64) apply sufficient pressure on the inner walls of the respective chambers to keep the piston unit (6) and the piston head (7) in their position as long as the product has not yet been filled.

Such a unit with two chambers is intended to be fixed on a dispensing device, for example a two-way valve (4) or a two-way pump. It is also possible to provide only a closure, which is opened during the dispensing process. The closure may comprise dosing means such that a predetermined amount of each product is emitted upon manipulation of the closure. Two-way valves are known, for example, from document US 3,915,345 a or document WO 2007/132017 a 1. The two-way valve in the example shown here is of the type as described in this last-mentioned document. The functional principle of the valve is therefore not explained in detail, but only the features which are obtained in the context of its application in the dual-chamber system according to the invention are explained below.

The valve body (41) comprises a first part in the form of a downwardly projecting flange (Kragen) (42) and a second central part in the form of a cylindrical plug (Zapfen) (43), wherein the part in the form of the flange (42) surrounds the plug-shaped part (43). The flange-shaped part (42) is provided at its lower end with a holder which is complementary to the holder (27) of the housing (2). The holder is dimensioned such that a sealed connection between the housing (2) and the flange-shaped part (42) is provided. On the other hand, the plug-shaped part (43) is dimensioned such that it penetrates into the sleeve (33) of the inner housing and also ensures a sealed connection there. The valve is provided with two separate passages, one of which opens into the space between the flange (42) and the plug (43) and the other opens into the interior of the plug (43). When the dispensing module (1) is secured to the valve (4), the first chamber thus opens into the first passage and the second chamber opens into the second passage of the valve.

As in the two-way valve of document WO 2007/132017 a1, it is possible to provide one or more openings in the body of the valve (41) so that, when the valve is operated, the gas can exit via the same path as the first product. There is no objection to the addition of a third product to the motive gas which does not react with it. The container then comprises three spatially separated products during storage.

The unit consisting of the two-chamber dispensing module (1) and the dispensing means (4) can then be fixed in the housing (5). The dispensing module (1) can be introduced into the inner region of the prefabricated housing if the dimensions of the dispensing unit (1) and in particular the outer diameter of the housing (2) and/or the diameter of the valve disk (44) of the dispensing means allow this. Otherwise, the housing (5) needs to be constructed around the dispensing module (1). This is the case in the example shown in the figures. A first advantage of the dispensing module lies in the fact that it is possible to use housings of any shape, in particular with a curved or profiled outer portion. The inner side of the housing must in the prior art be exactly cylindrical in order to enable the piston to slide along (endlandgleiteen), but now can be provided with an elegant or ergonomically shaped housing. A second advantage is that the deformation of the housing has no influence on the function of the piston. The smallest projection (bead) in the prior art may prevent the piston from sliding along at the housing or its deformation may cause a non-tightness of the first chamber, whereas the container provided with the dispensing module according to the invention is crash-resistant.

Fig. 3 shows a container provided with a dispensing module (1) fixed at a two-way valve (4), wherein the two-way valve (4) is fixed on the neck of the housing (5). Gas is introduced into the housing and exerts a pressure on both the first piston (61) and the second piston (64) or, in the present case, on the piston head (7). The container can now be filled with two products. The first product is therefore initially filled into the first chamber (20) via the first passage of the dispensing means (4), then the opening (261) and the channel (24). The piston unit (6) is pushed back by the incoming product, which presses on the piston (61). When the second piston has a separate piston head (7) as shown in the illustrated example, it remains in its initial position, that is to say in the region of the upper part of the second chamber (30), while the upper part (64) of the piston unit (6) is pressed downwards by the first piston (61). Openings (642) in the upper part of the piston unit (6) prevent a vacuum from building up between the fixed piston head (7) and the upper part of the piston (64) that descends downwards. At the end of the filling process, the first chamber (20) impacts the rim (63) of the first piston (61) against the annular radial wall (82) of the retaining means (8), as shown in fig. 4.

The second product can now be filled into the second chamber (30) via the second passage of the valve (4) and the plug (43), and the sleeve (33). The incoming product presses the piston head (7) downwards. The gas in the space between the interiors of the columnar members (62) of the piston unit is pushed out in the upper member (64) of the piston unit via the openings (642). The pressure exerted by the second product on the piston head (7) is sufficient to overcome the resistance of the catch (641, 722) and to catch the piston head (7) in the piston unit (6). The two pistons (61, 64) are now coupled to one another and can only be moved synchronously. This corresponds to the situation shown in fig. 5. Only the nozzle head (Sprihkopf) has to be inserted onto the stem (45) of the valve and possibly a protective cap has to be mounted. The container is ready for use. It is only possible to fill the container at two separate filling units due to the separate piston head (7).

In contrast to the embodiment shown in the present example, the second piston is formed directly on the upper side of the piston unit (6), which side has no openings (642), wherein the downward movement of the upper side (which acts as a piston) causes air to penetrate into the second chamber (30), which is formed simultaneously with the first chamber. The air contained in the structured second chamber (30) must therefore be sucked in before the second product is filled.

It will be appreciated that the chambers (20, 30) are configured when filled with product. If a separate piston head (7) is provided for the second chamber (30), the second chamber (30) is not constructed simultaneously with the first chamber (20). Instead, it is built upon filling with the second product. It is therefore not necessary to provide suction means for drawing air out of the second chamber before the second product is filled.

Depending on the composition of the product used, it may be necessary to clean the components contacted by the product after filling the first chamber and before filling the second chamber and possibly also after filling the second chamber in order to avoid undesired reactions between the product or its contaminants.

The ratio between the initial volumes of the first and second products is determined by the ratio between the areas of the first piston (61) and the second piston (64). The dispensing module thus makes possible a very great precision, which is related to the ratio of the initial volumes of the two products. It is also possible to fill the second chamber (30) with a higher pressure than the outer pressure due to the area ratio between the areas of the first piston (61) and the second piston (64).

It goes without saying that the first piston (61) can also be designed with a separate piston head. The piston head is then annular and when only the first piston has such a piston head, filling starts with the second chamber (30) and not with the first chamber (20). The height of the first cylindrical part (21) of the outer housing and/or the cylindrical part (62) of the piston unit must be large enough to make it possible for the piston unit (6) to penetrate completely into the inner housing, wherein it strikes with its upper part without the annular piston head snapping into the piston unit (6). When the first piston (61) has a removable piston head, it is not necessary that the second piston (64) is also provided with a separate piston head (7).

If the dispensing module (1) is used at a pressure vessel, as is the case in the example shown here, it can be expedient to fix the unit consisting of the dispensing module (1) and the dispensing means (4) in the housing (5), wherein the valve disk (44) is not fixed to the housing (5). This enables the dynamic gas to be filled during filling before the valve disk (44) is fixed to the housing (5). In order to fix the unit consisting of dispensing module/dispensing means in this position (as shown in fig. 2), a fork (9) is provided which locks the unit in such a way that the tip of the second cylindrical part (22) of the housing strikes against the inside of the upper side of the housing (5). The removable fork (9) penetrates into a groove (28) which is arranged for this purpose below the fastening element (27) at the tip of the housing (2).

It is alternatively also possible to fix the valve disk (44) at the housing (5) of the pressure vessel, then fill the dispensing module (1) and fill it with gas via an opening in the bottom of the pressure vessel, which is subsequently closed. If the gas is introduced from above, it must be ensured, for example, by means of a channel provided for this purpose that the gas can flow to the bottom.

Suitable motive gases for the extraction of the product are, in particular, compressed gases, such as nitrogen, oxygen and compressed air, and liquefied gases, such as hydrocarbons, for example butane and isopentane (Isopentan), dimethyl ether and fluorinated hydrocarbons (Fluor-Kohlenwasserstoffe). However, it is also possible to dispense the product by means of a mechanical system (e.g. a spring) or an elastic material with a restoring force (e.g. an elastomer).

The field of application of the dispensing module according to the invention can be, for example, in the technical or pharmaceutical field, in the field of medical products, foodstuffs, cosmetics, body care, biocides, disinfectants or bleaches. Furthermore, the most different product concepts can be realized: the reaction system may be, for example, a system for generating a gas (e.g., CO)₂) (ii) a Systems that harden (for example chemical reactions such as chain extension (Kettenverl ä gerung), crosslinking (Vernetzung), coagulation (koagulant), polymerization (polymerization), in particular in the field of polyurethane chemistry (polyurethane chemistry)); possibly with viscosity change, generating active substances (e.g. chlorine, hypochlorous acid)Salt, H₂O₂Sulfur, iodine) colloidal systems; a system of enzymes; an acid-based system; temperature-changing systems (e.g., exothermic or endothermic mixtures) or viscous systems. Further product concepts are mixtures and the generation of special material properties, such as emulsions, dispersions, W/Ö, Ö/W, W/Ö/W, odours, active ingredient mixtures (Wirkstoffmischung) (AM)), mixtures of active substances (e.g. vitamins), colours (e.g. colouring of objects and body parts), mixtures with a biocidal action and certain flow or slip properties.

List of reference numerals

1 dispensing module

2 outer cover

21 first columnar member (lower member)

22 second column parts (Upper part)

23 radial connecting wall

24 channel

25 projection

26 radial annular shoulder

261 opening

27 fixing piece

28 grooves for removable forks

3 inner shell

31 columnar main part

32 truncated pyramid shaped component

33 parts forming a sleeve

331 radial annular groove

4 two-way valve

41 valve body

42 flange-shaped part

43 plug-shaped part

44 valve disk

45-bar

5 casing

6 piston unit

61 first piston

611 annular groove

62 columnar member

63 sealing ring

631 sealing lip

64 second piston

641 locking member for piston head

642 pressure equalizing port

7 head of the second piston

71 radial wall

72 sealing ring

721 sealing lip

722 latch fitting

8 holding member

81 axial rim

82 radial annular wall

9 removable forks.

Claims (8)

1. Dispensing module (1) for two fluid products, comprising:

-a first chamber (20) with a first wall, wherein the first chamber has a first opening,

a first piston (61) movable in abutment against a wall of the first chamber (20),

a second piston (64) which is movable in abutment against a wall of the second chamber (30),

-wherein a coupling (62) is provided for coupling the two pistons (61, 64) during product dispensing,

wherein the dispensing module (1) has a second chamber (30), the second pistons (64 and 7) being movable in abutment at their walls, wherein the second chamber (30) has a second opening, characterized in that the coupling has a part (62) which connects the first piston (61) with the second pistons (64 and 7), wherein the first piston (61), the part (62) and the second pistons (64 and 7) form a piston unit (6), wherein the first chamber (20) is of annular shape and is delimited in its central region by the part (62) of the piston unit (6), and wherein the second chamber (30) is arranged concentrically to and above the first chamber (20), and the first piston (61) and/or the second piston (64) has a piston head (7), which is initially separated from the coupling member (62) and irreversibly connected to the coupling member (62) after filling the dispensing module with the product.

2. Dispensing module according to claim 1, wherein the coupling piece (62) traverses the first chamber (20) and the side of the first piston (61) facing away from the opening of the first chamber (20) is in contact with the side of the second piston (64 and 7) facing away from the opening of the second chamber (30).

3. Dispensing module according to claim 1 or claim 2, characterized in that a fixing (27, 33) is provided for coupling the dispensing module to a removal means (4) or a means for closing the opening of the chamber.

4. Dispensing module according to any one of claims 1 to 3, characterized in that a take-out means (4) is provided which is in connection with the opening of the chamber (20, 30).

5. Dispensing module according to claim 4, characterized in that the extraction means comprise a two-way valve (4) or a two-way pump, wherein the first passage is in connection with the opening of the first chamber (20) and the second passage is in connection with the opening of the second chamber (30).

6. A dispensing module according to claim 4 or 5, wherein the extraction means comprises a dosing device.

7. A dispensing module according to any of claims 1 to 3, characterized in that a closure is provided to close the openings of the first and second chambers (20, 30), wherein the closure has an open and a closed position.

8. Dispensing module according to any one of claims 1 to 7, characterized in that a housing (5) is provided which is fixed at the dispensing module (1) or at the extraction means or at the closure.