EP0565977B1 - Plastic dosing pump for low viscosity materials, in particular pasty materials - Google Patents

Description

The invention relates to a dosing pump made of plastic for dispensing dosed quantities of low-viscosity, in particular paste-like media from a bottle, can or tube-like container with a spring-elastic bellows as a pumping element, which connects between a dimensionally stable, upper housing part and a lower, coaxial and telescopically movable, likewise dimensionally stable housing part is arranged and the interior of which forms a pumping chamber through which the medium is pumped, its upper end section sealing against an annular wall of a radial intermediate wall of the upper housing part provided with at least one paste passage and / or one outlet valve and its lower end section sealing abuts an annular collar of a radial partition of the lower housing part, and wherein the upper housing part has an outlet opening and the lower housing part is provided with an intake valve connecting the container to the pumping chamber and with an intake pipe socket through which the intake valve can be connected or connected to the container.

A metering pump of the generic type is known for example from DE-U-88 00 880. There, the intermediate wall of the upper, telescopic housing part guided in the lower housing part is provided with a pipe socket directed downwards against the partition or the suction valve, which is sealingly enclosed by a reinforced annular collar of the bellows. On its top, this pipe socket is provided with a conical valve seat ring surface on which a closing member rests, which resiliently rests on the end wall of the upper, two-part housing part and is axially movably guided in the pipe socket by means of an axial cross rib. The upper housing part consists of two latching hollow bodies, one of which has a cylindrical guide wall with which it is guided in an axially movable manner in the lower housing part between two end positions. The second hollow body of the upper housing part, which is inserted in a protruding cylindrical wall section above the intermediate wall, has an eccentric, channel-like outlet opening which runs parallel to the axis and which is directly connected to a cavity in which the closing element of the dispensing valve is arranged and which is connected to the interior of the bellows via this dispensing valve, while the upper housing part as a whole is relative moved down to the lower housing part in the course of a conveying stroke.

With this type of metering pump, which for example also corresponds to the metering pump of EP-A-0 194 417 and which have a bellows as a pumping element, it is in principle possible to simultaneously suck in and dispense two or more different media from separate containers. However, because all the media sucked in together flow through the same pump chamber formed by the interior of the bellows, their mixing is uncontrollable. A strip-like addition of a second, e.g. medium of a different color to a main medium is therefore impracticable.

A paste dispenser is also already known (US-A-4 438 871), which, however, as the pumping organ does not have a bellows, but two manually operated pump pistons, which, in cooperation with suction valves, simultaneously operate two media from two concentrically one inside the other Aspirate separate paste containers, each provided with a trailing piston, and convey them via separate channels into a storage space which is arranged directly in front of an outlet opening. This storage space encloses a plunger-like closing element which is arranged on an elastic membrane wall acted upon by the delivery pressure of the medium.

The two pump pistons are arranged coaxially to one another, rigidly connected to one another and provided with a common actuating element which is actuated manually. In order to pump different quantities, the pump pistons are provided with different diameters. The likewise coaxial, cylindrical pump chambers, which are connected to the separate paste containers via suction valves, are connected to two separate guide channels via separate outlet valves, which are arranged approximately axially parallel, eccentrically to the pump chambers and open into the storage space.
This results in a labyrinthine spatial shape of the interconnected pumping chambers and guide channels, which is difficult to manufacture and costly to manufacture, so that it is unsuitable for mass production, especially when it is a so-called disposable item.

The invention has for its object to provide a metering pump of the type mentioned while maintaining the manufacturing simplicity, which results in particular from the use of a bellows as a pumping element, with a second pumping chamber, through which a second medium from a divided medium is simultaneously used with a first medium Container space of the same container or from a second separate container can be transported separately from the first medium to a common or separate discharge opening.

This object is achieved in that of two telescopically guided annular wall connectors, which concentrically enclose the bellows at a radial distance and are each formed on one of the two housing parts and by the bellows, a second pumping chamber for a second medium, which is formed by a second Exhaust valve and / or at least one passage opening of the intermediate wall is connected to the outlet opening and is connected on the suction side via at least one eccentric suction channel in the partition of the lower housing part to an annular space of the container surrounding the suction nozzle or to a second container.

In the metering pump according to the invention, the bellows is the only pumping element at the same time in two separate pumping chambers effective, through which two media can be pumped separately in different proportions and transported to a common or separate outlet openings. There is the possibility of influencing or changing the quantitative ratios of the two media both by the volumes of the pumping chambers and by the cross-sectional relationships between the suction openings on the one hand and the outlet cross sections on the other hand.
Another advantage of the metering pumps according to the invention is, above all, that no additional individual parts are required to form the second pumping chamber, rather the means used consist of molded elements which are integrally formed on components which are already present, a further important advantage being that that the assembly is by no means more complex due to the added form elements.

While the advantageous refinements of claims 2 to 5 contribute to achieving simple, easily mountable and functionally reliable shapes, the refinements of claims 6 to 10 enable the metering pump to simultaneously remove two media, eg. B. in a ratio of 1: 1 or in another ratio, from two separate containers to which the metering pump is also very can be connected easily. However, there is also the possibility of using the metering pump according to the invention to pump only one medium from a container, it being completely irrelevant that one of the two pumping chambers remains ineffective.

Fig. 1

einen kompletten Pastenspender mit einer Dosierpumpe der gattungsgemäßen Art im Schnitt;

Fig. 1a

eine Schnittdarstellung der Dosierpumpe der Fig. 1 in vergrößertem Maßstab;

Fig. 2

einen Schnitt II-II aus Fig. 1;

Fig. 3

einen kartuschenartigen Pastenbehälter im Schnitt;

Fig. 4

den oberen Teil einer anderen Ausführungsform der Dosierpumpe im Schnitt;

Fig. 5

das Gehäuseoberteil im Schnitt als Einzelteil;

Fig. 6

einen Schnitt VI-VI aus Fig. 5;

Fig. 7

die Stirnansicht VII der Auslaßöffnung aus Fig. 5;

Fig. 8

einen Pastenspender mit der erfindungsgemäßen Dosierpumpe und mit zwei gleich großen kartuschenartigen, jeweils mit einem Nachlaufkolben versehenen Pastenbehältern im Schnitt;

Fig. 9

einen Schnitt IX-IX aus Fig. 8;

Fig. 10

einen Schnitt X-X aus Fig. 8 und

Fig. 11

die Dosierpumpe der Fig. 8 in Vergrößertem Maßstab im Schnitt.

Claims 11 and 12 relate to advantageous design options for the outlet channel and the outlet opening.
The invention is explained in more detail below with the aid of the drawing. It shows:

Fig. 1

a complete paste dispenser with a metering pump of the generic type in section;

Fig. 1a

a sectional view of the metering pump of Figure 1 on an enlarged scale.

Fig. 2

a section II-II of Fig. 1;

Fig. 3

a cartridge-like paste container in section;

Fig. 4

the upper part of another embodiment of the metering pump in section;

Fig. 5

the upper housing part in section as a single part;

Fig. 6

a section VI-VI of Fig. 5;

Fig. 7

the end view VII of the outlet opening of Fig. 5;

Fig. 8

a paste dispenser with the metering pump according to the invention and with two cartridge-like, paste containers each provided with a trailing piston on average;

Fig. 9

a section IX-IX of Fig. 8;

Fig. 10

a section XX of Fig. 8 and

Fig. 11

8 on an enlarged scale in section.

The paste dispenser shown in FIGS. 1 and 1a has an integrated metering pump 1 as the head part. This consists essentially of two cylindrical housing parts 2 and 3, a bellows 4, a suction valve 5 and an outlet valve 6. While the two housing parts 2 and 3 consist of hard, dimensionally stable plastic, the bellows 4 consists of a softer, form-elastic plastic which at the same time is able to apply the restoring forces required for the pumping process for the housing part 2 relative to the housing part 3. The metering pump 1 is provided with an easily removable protective cap 7 which can be removed in use.

The housing part 2 consists of a cylindrical housing lower part 8 and a form-fitting and non-positively connected upper housing part 9 with an outlet opening 10 which forms the outer end of an outlet channel 11. The upper housing part 9 is provided with an oblique, top ribbed cover wall 12, to which a sealing on an intermediate wall 13 of the lower housing part 8 seated, essentially cylindrical chamber wall 14 is formed. This chamber wall 14 encloses an outlet chamber 15 which is connected to the outlet channel 11 and is in turn surrounded by a likewise cylindrical annular channel wall 21 which encloses an annular channel 22 which communicates with the outlet channel 11 via two lateral openings 23 and 24. The annular channel wall 21 also sits on the intermediate wall 13 in a sealing manner. 7, the outlet channel 11 and the outlet opening 10 have the cross-sectional shape of an elongated hole which is horizontal when the axis of symmetry 1 'is in a vertical position and which is made up of two semicircular arches 10/1, 10/2 and two parallel walls 11/1 connecting them. 11/2 is limited. The inner sides of the semicircular arches 10/1, 10/2 are each provided with axially parallel guide ribs 57 which form strip channels 58 through which the second medium is added in strips to the output strand of the first medium.

The lower housing part 8 projects with a lower, cylindrical guide section 16 into a guide cylinder 17 of the housing part 3, so that it can be moved by an axial stroke H between an inner annular rib 18 of the guide cylinder 17 and a radial wall 19 of the housing part 3.

5, 6 and 7 as an individual part of the housing upper part 9 is provided with differently shaped wall sections above the cylindrical wall section 9 'provided with a circumferential locking rib 27 and an annular collar 29 seated on the upper end face 28 of the outer wall 25 are essentially aligned with the outlet opening 10 or the outlet channel 11, which extends at an angle of approximately 45 ° to the central axis 1 '.
Above a radial intermediate wall 13, the outer wall 25 of the lower housing part 8 is provided with an inner, circumferential locking groove 26, which serves for the locking reception of the locking rib 27 of the upper housing part 9.

On the underside of the intermediate wall 13, a cylindrical annular wall piece 30 is formed in one piece and concentrically to the bellows 4, which sealingly and telescopically accommodates a likewise cylindrical, upwardly directed annular wall piece 31, which in turn is integrally formed on the radial wall 19 of the lower housing part 3. The inner diameters of these two ring wall connections 30 and 31 are selected such that they have a certain radial distance from the circumference of the bellows 4 and thus form a second, annular pump chamber 33 together with the bellows 4. The first pump chamber 32 is formed in a known manner from the cavity of the bellows 4.
The second pumping chamber 33 communicates with the annular channel 22 through a plurality of axially parallel passage openings 34 in the intermediate wall 13.

In the center of the intermediate wall 13 there is a conical valve seat ring surface 20, to which a cylindrical pipe socket 35 adjoins downward. This pipe socket 35 is surrounded at a certain radial distance by an annular wall 36 which is open at the bottom and on which an upper annular end wall 37 of the bellows 4 is supported. The end wall 37 has in its center a collar 38 which tightly surrounds the pipe socket 35.

As an axially movable closing member 39, the outlet valve 6 has a closing cone formed as a hollow body, which is guided by means of an axial cross rib 40 in the cylindrical pipe socket 35 and which is provided at its upper end with an axially elastic annular collar 41, which on the plane lower edges 42 of several radial Ribs 43 of the upper housing upper part 9 resiliently and which presses the lower boundary edge 44 of the closing member 39 sealingly against the valve seat ring surface 20. This collar 41 points in the Drawing not visible openings through which the medium can flow axially.

The lower end of the bellows 4 has an annular wall 45 which sealingly surrounds a cylindrical wall 46 of a concentric, pot-like receptacle 47 projecting in the dispensing direction. This receptacle 47 has on the one hand an annular end wall 48, on which a downwardly directed connecting piece 49 is integrally formed. This connection piece 49 has a cylindrical inner surface 50 and a downwardly tapering outer jacket surface 51. An axially movable closing element 52 of the intake valve 5 is seated in this connection piece 49, which abuts a conical valve seat surface 54 with a conical closure plate 53. The closing member 52 is provided on the underside of the closure plate 53 with a cross rib 55, through which it is guided on the cylindrical inner surface 50 of the connecting piece 49. A total of three holding fingers 56 are arranged on the top of the annular end wall 48 of the receiving socket 47, which prevent the closing element 52 from falling out.

Below the radial wall 19, the housing part 3 is in one piece, preferably cylindrical or in cross section formed on the elliptical envelope body 60, which serves to completely accommodate a paste container 61 provided with a suitable cross-sectional shape and which has a thickened, circumferential edge bead 62 at its lower end. The relatively thin-walled paste container 61 is provided with a trailing piston 64 inserted into its open lower end 63 and has at its lower end 63 an annular collar 67 forming an annular groove 67 with the somewhat conically widening end section 65 of its casing wall 66, the one with internally directed upper edge 69 is provided. As a result, the thickened edge bead 67 of the enveloping body 60 can be inserted into this annular groove 67 in a latching manner when the paste container 61 is inserted into the enveloping body 60 from below. The bead 62 and the annular collar 68 each give the lower ends of the enveloping body and the paste container 61 increased dimensional stability, which makes handling easier insofar as when inserting and removing the paste container 61 into or from the enveloping body 60 to avoid undesired deformations special attention needs to be paid.

At its upper end, the paste container 61 (FIG. 3) has a collar 72 protruding against the suction valve 5 of the metering pump 1 on an end wall 71. This Collar 72 is provided with an inwardly directed sealing ring 74 which is integrally formed on an end wall ring 73 and on which a cup-shaped separating closure 76 is integrally molded via a thin annular separating web 75 (FIG. 3).

In order to be able to automatically separate this separating closure 76 from the sealing ring 74 when the paste container 61 is fully inserted into the casing 60 of the metering pump 1 and to push it into the interior of the paste container 61 so that an outlet opening for the paste located in the paste container 61 is formed, is on the lower end face of the connecting piece 49 of the housing part 3 via a plurality of distributed axial supports 77, an opening plunger 78 is formed, which separates the separating closure 76 from the sealing ring 74. This opener plunger 78 is provided with a plurality of pressure fingers 79 which, when the collar 72 of the paste container 61 is inserted into the receptacle 47 of the housing part 3, separate the separating closure 76 from the sealing ring 74 and, as shown in FIGS. 1 and 1a, into the interior of the paste container 61 slide.

A cylindrical suction nozzle 80 is formed on the end wall 71 of the paste container 61 as an extension of the collar 72 directed downward into the interior of the container. The The annular chamber 81 surrounding this suction port 80 is provided for receiving a second medium which is to be pumped through the second pump chamber 32, the passage openings 34 and the annular channel 22 into the discharge channel 11. For this purpose, the radial wall 19 of the housing part 3 is provided with one or more, preferably three, suction channels 82, which are arranged in the radial region lying between the wall 46 and the annular wall socket 31 and open into the second pump chamber 32. At the bottom, these suction channels 82 are extended by sleeve-like projections 83, which at the same time serve to pierce separating closures 84 of the end wall 71, which are arranged eccentrically outside the suction nozzle 80, and to establish the connection to the annular chamber 81 of the paste container.
In order to facilitate this piercing of the separating fasteners 84, the lower end edges of the lugs 83 are sharp-edged and, so that the separating fasteners 84 are also folded to the side when they are separated, the lower end edges of the extensions 83 are designed to run obliquely.

Because the opening plunger 78 is connected to the connecting piece 49 by means of axial webs 77, the paste located in the paste container 61 can flow into the connecting piece 49 almost unhindered or through it are sucked into the inside of the bellows 4 while the housing part 2 moves upwards again after a downward lifting movement. At the same time, a substantially smaller amount of the second medium is drawn from the annular chamber 81 into the second pump chamber 33, which is smaller in volume.
Advantageously, an elastic, annular valve lip 85 is formed on the circumference of the lower, cylindrical end section 35 of the bellows 4 for valve-like closing of the suction channels 82 or for forming a second suction valve 5 ′ for the second pumping chamber 33, which prevents the medium from flowing back out of the second pumping chamber 33 prevented in the suction channels 82, but which allows the second medium to flow into the second pumping chamber 33 during the suction process.

However, there is also the possibility of dispensing with the valve lip 85. For this purpose, however, it is necessary to make the total passage cross-section of the suction channels 82 smaller than the total passage cross-section, which the passage openings 34 of the intermediate wall 13 of the upper housing part 2 have, so that in the downward working stroke of the upper housing part 2 in the second pumping chamber 32 a sufficient large dynamic pressure arises, which causes the second medium to be conveyed through these passage openings 34 and the annular channel 22 can cause through to the output channel 11.

In the embodiment of the metering pump 1 shown in FIG. 4, the passage openings 34 of the intermediate wall 13 are covered on the upper side by an elastic annular lip 34/1 in the manner of a one-way valve; the annular lip 34/1 thus forms a second outlet valve 6 '. This annular lip 34/1 is underlaid on the end face of the annular channel wall 21 and centered thereon by means of an inner centering projection 34 '.

So that only the smallest possible amount of paste remains in the paste container 61 when the trailing piston 64 has reached the upper end wall of the paste container 40, the radial wall 91 of the trailing piston 64 is provided in the center with an annular recess 92, into which the suction port 80 and the Can open plunger 78 and, if necessary, the detachable closure 76.

Another paste dispenser is shown in FIGS. 8 to 11, with an enveloping body 60/1 formed on an elongated-round partition 100 of a lower housing part 3/1, which at the same time has two cylindrical, cartridge-like paste containers 61/1 provided with trailing pistons 101 and 61/2 interchangeably accommodated directly next to each other. According to the cross-sectional shape shown in FIG. 9, the enveloping body 60/1 has two semicircular wall sections 107, 108 which are arranged symmetrically with respect to an axis of symmetry 106 and which are connected to one another by parallel straight wall sections 109, 110.
Both paste containers 61/1, 61/2 can, but do not have to have the same shape. Your upper end walls 102, 103 are each provided near the edge, that is, with eccentrically arranged, cylindrical connection openings 104, 105, which in the original state, for. B. are closed by break-out or in the container interior pushable closure lid. On the top of the partition 100, the lower housing part 3/1 of a metering pump 1/1 is integrally formed offset in relation to the symmetry axis 106, which is basically constructed in the same way as the metering pump 1 of the exemplary embodiment described above. The differences between these two metering pumps 1 and 1/1 will now be discussed in more detail here.
The upper housing part 2/1 differs from the housing part 2 only in that the ring wall socket 30/1 forming the upper radial boundary of the second pumping chamber 33/1 has a larger diameter, so that the second pumping chamber 33/1 receives the same pump volume as that first pump chamber 32. Correspondingly, the lower annular wall socket 31/1, which projects telescopically and sealingly into the upper annular wall socket 30/1 and is formed on the upper side of the partition wall 100, is provided with a larger diameter.

There is also the possibility of integrally molding two paste containers directly onto the partition 100 instead of the enveloping body 60/1 receiving the two separate paste containers 61/1, 61/2.
The enveloping body 60 (FIG. 1) could also be replaced by a paste container integrally molded onto the radial wall 19.

The upper cylindrical end section 38/1 of the bellows 4/1 encloses an annular wall 36/1 concentrically surrounding the pipe socket 35 at a radial distance. On the outer surface of this end section 38/1 is an upwardly curved, forming the movable closing element of a second outlet valve 111, Elastic ring lip 112 is formed, which rests sealingly in the return flow direction on the inner surface of the ring wall socket 30/1.

The lower cylindrical end portion 45/1 of the bellows 4/1 sits sealingly in an upwardly directed annular collar 47/1, which is connected to the annular wall socket 31/1 of the partition 100 forms an open top ring channel 113. Within the collar 47/1 there is concentric to this an open top, with an outer jacket surface serving as a valve seat surface, directed upwards, on which spring and sealing an integral via axial connecting webs on the lower end section 45/1 of the bellows 4 / 1 molded, cap-like valve closing member 115 which, together with the annular shoulder 114, forms the first suction valve 116 of the metering pump 1/1 lying within the bellows.
The cylindrical cavity 117 of the annular shoulder 114 is in communication with the likewise cylindrical outlet channel 118/1 of a first eccentric suction nozzle 118, which projects into a connection opening 105 of the right paste container 61/2 and which, when this paste container 61/2 is inserted into the enveloping body 60 / 1 the existing cover of the connection opening 105 has been removed. In an analogous manner, the ring channel 113 is connected to a second suction channel 117/1 of a second suction nozzle 119, which is arranged symmetrically with respect to the plane of symmetry 106 with respect to the suction nozzle 118 and which projects into the connection opening 104 of the other paste container 61/1.

The second suction valve 120 assigned to the second pumping chamber 33/1 is an elastic ring lip which is formed on the circumference of the lower end section 35/1 of the bellows 4/1 and which covers the ring channel 113 in a tightly fitting manner all around on the inside of the ring wall socket 31/1 and blocks in the flow direction.

As can be seen from the sectional view of FIG. 10, in the embodiment of FIGS. 8 to 10 the outlet channel 111/1 or the outlet opening 110/1 is provided with a dividing wall 121 which runs parallel to the axis of symmetry 106, i.e. which is vertical Outlet duct 111/1 and the outlet opening 110/1 divided into two sections 111/2 and 111/3 which are of equal cross section. There is also the possibility of allowing the partition wall 121 to end within the outlet opening 110/1, so that only the outlet duct 111/1 is divided and / or to be arranged in such a way that compartments 111/2 and 111/3 with different cross sections result .

It is easy to imagine that the two paste dispensers described work in basically the same way: with each downward stroke, ie against the radial wall 13 or the partition 100, of the upper housing part 2 or 2/1, a part of itself in the two pumping chambers becomes 31, 33 or 33/1 located media through the Outlet channel 11 or the compartments 111/2, 111/3 of the divided outlet channel 111/1 conveyed to the outside. During the subsequent suction stroke caused by the restoring force of the bellows 4 or 4/1, in which the upper housing part 2 or 2/1 moves back into its upper starting position, the annular chamber 81 and the remaining cavity of the paste container 41 become or, from the two paste containers 61/1 and 61/2, the two media contained therein are sucked into the pumping chambers 32, 33 and 33/1, as previously output during the working stroke. The pumping quantities of the two pumping chambers 32, 33 and 32, 33/1 are matched to the quantity ratios to which the two media are available.
In the case of the paste container 61, the quantity ratio of medium to medium is approximately 1:10; the pumped quantity ratio of the two pumping chambers 32 and 33 is also corresponding. In the case of the same-sized paste containers 61/1, 61/2, on the other hand, the quantity ratio of medium A: medium B = 1: 1, so that the pumping volumes of the two pumping chambers 32 and 33 / 1 are the same size.

The particular advantage of the metering pumps 1 and 1/1 according to the invention is, above all, that no additional individual parts are required to form the second pumping chamber are, rather the means used consist of molded elements which are integrally formed on existing components, with another important advantage to be seen in the fact that the assembly of the added elements is by no means more complex.

Claims (12)

1. Plastic dosing pump for the delivery of dosed quantities of low viscosity materials, in particular pasty materials from a bottle-like, can-like or tube-like container, with resilient bellows (4, 4/1) as a pumping member, which forms a connection between an inherently stable, upper housing part (2, 2/1) and a lower, likewise inherently stable housing part (3, 3/1) which is coaxial thereto and telescopically movable and whereof the interior forms a pump chamber (32), through which the medium is pumped, its upper end section bearing in a sealing manner against an annular wall (35) of a radial intermediate wall (13) of the upper housing part (2, 2/1) provided with at least one paste opening and/or an outlet valve (6) and its lower end section bearing in a sealing manner against an annular flange of a radial dividing wall (19, 100) of the lower housing part (3, 3/1) and the upper housing part (2, 2/1) comprising an outlet opening (10, 110/1) and the lower housing part (3, 3/1) being provided with a suction valve (5, 116, 120) connecting the container (61, 61/1, 61/2) to the pump chamber (32) as well as being provided with a suction socket (49, 118, 119), by which the suction valve (5, 116, 120) is connected or can be connected to the container (61, 61/1, 61/2), characterised in that by two annular wall sockets (30, 31, 30/1, 31/1) guided telescopically in each other, which concentrically surround the bellows (4, 4/1) at a radial distance and are respectively integrally formed on one of the two housing parts (2, 3, 2/1, 3/1), and by the bellows (4, 4/1), a second pump chamber (33, 33/1) for a second medium is formed, which is connected by a second outlet valve (34/1, 111) and/or at least one aperture (34) of the intermediate wall (13) to the outlet opening (10, 110/1) and which is connected on the suction side by at least one eccentric suction channel (82, 119) in the radial or dividing wall (19, 100) of the lower housing part (3, 3/1) to an annular chamber (81) of the container (61) surrounding the suction socket (80) or to a second container (61/2).
2. Dosing pump according to Claim 1, characterised in that the apertures (34) in the intermediate wall (13) open into an annular channel (22) of the upper housing part (2, 2/1), which is connected to the outlet opening (10).
3. Dosing pump according to Claim 1 or 2, characterised in that the apertures (34) in the intermediate wall (13), from the annular channel (22), are sealed by resiliently supported closing members, in particular by resilient annular or valve lips (34/1) in the manner of an outlet valve.
4. Dosing pump according to Claim 1 or 2, characterised in that the bellows (4, 4/1) comprise respectively at the upper and/or lower end section, radial annular lips (85, 112, 120), which bear in an elastically sealing manner against the inner sides of the two annular wall sockets (30, 31, 30/1, 31/1) and can be lifted alternately from the inner sides by the flow forces of the second medium.
5. Dosing pump according to Claim 1, characterised in that the apertures (34) in the intermediate wall (13) are located outside the radial region of the chamber wall (14) connected to the upper end section of the bellows (4, 4/1).
6. Dosing pump according to one of Claims 1 to 5, characterised in that on two diametrically opposed sides, the annular channel (22) opens by openings (23, 24) into an outlet channel (11) of the outlet opening (10).
7. Dosing pump according to one of Claims 1 to 5, characterised in that the dividing wall (100) of the lower housing part (3/1) is provided with two downwardly directed suction sockets (118, 119), whereof separate cavities are respectively connected to one of the two pump chambers (32, 33/1).
8. Dosing pump according to Claim 1, characterised in that the two suction sockets (118, 119) are located diametrically and symmetrically opposite each other with respect to an axis of symmetry (106) and project into separate containers (61/1, 61/2).
9. Dosing pump according to one of Claims 1, 7 or 8, characterised in that integrally formed on the dividing wall (100) are two separate containers respectively provided with a follower piston (101) or an enveloping body (60, 60/1) for the exchangeable receiving of cartridge-like containers (60, 61/1, 61/2).
10. Dosing pump according to one of Claims 1 or 7 to 9, characterised in that the second pump chamber (33/1) has at least approximately the same pump volume as the first pump chamber (32).
11. Posing pump according to one of Claims 1 or 7 to 10, characterised in that the outlet opening (110/1) and/or the outlet channel (111/1) of the upper housing part (2) is divided by a dividing wall (121) into two compartments (111/2, 111/3), whereof the one compartment (111/3) is connected to the annular channel (22) and the other compartment (111/2) is connected to the outlet chamber (15) of the first pump chamber (32) or to its outlet valve (6).
12. Dosing pump according to one of claims 6 or 11, characterised in that the outlet opening (10) comprises the outer opening end of an outlet channel (11), whereof the inner surface is provided at least in sections with strip channels (58), which are formed by guide ribs (57).

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