EP0492354A1 - Dosing and spraying pump for dispensing liquid, low viscous and paste-like material - Google Patents

Abstract

An elastic communicating bellows (3) is arranged to form a connection between two plastic housing components (1, 2) which are movable with respect to one another in a telescopic fashion in a metering and spraying pump for fluids and substances with low-viscosity and pasty substances, which communicating bellows has at one end an annular valve wall (15) as a discharge valve (15), which wall encloses the outer face (17) in a sealing and liftable manner of an annular wall (8) which is formed onto the first housing component (1). The communicating bellows (3) has at its other end an annular valve wall (54) as suction valve (58) which wall rests in a sealing and liftable manner against the outer face (43) of a valve seat (42) formed onto the second housing component (2), through which seat the pump medium is sucked into the communicating bellows (3). In order to ensure, with the smallest number of simple and easy-to-mount individual components, a high degree of functional reliability, in particular a seating quality, which can be tested also under dry conditions, with low valve opening forces, the annular valve wall (15) of the discharge valve (18) and the annular valve wall (54), provided with a closed end wall (57), of the suction valve (58) rest in each case against conical or cap-like outer faces (17, 43), in which case the two annular valve walls (15, 54) are connected to the communicating bellows (3) both radially elastically and resiliently movable in the axial direction. <IMAGE>

Description

The invention relates to a metering and spray pump for dispensing liquid, low-viscosity and pasty, substances from bottle or can-like containers with a bellows made of elastic plastic, which is arranged connecting two telescopically movable housing parts made of dimensionally stable plastic and as a dispensing valve at one end has a sleeve-like valve ring wall, which encloses the outer surface of a round ring wall formed on the first housing part performing the pumping strokes in a sealing manner and which, as an intake valve, also has a sleeve-shaped valve ring wall at its other end, which is formed on the outer surface of a round, formed on the second housing part Valve seat is sealing and liftable, through which the pump medium is sucked out of the container into the bellows.

In a known metering and spray pump of the generic type (DE 38 28 811 A1), the valve ring wall sealingly enclosing the cylindrical outer surface of an attachment forming the valve seat of the dispensing valve is only radially elastic and thus only radial removable. Also, the valve ring walls of the suction valves provided there in different designs can only be lifted elastically in the radial direction from the cylindrical jacket surfaces forming their valve seat, so that the medium drawn in can flow between the relevant jacket surface and the valve ring wall surrounding it into the interior of the bellows.

In practice, such dispensing and suction valves for metering and spray pumps of the generic type have proven to be unsatisfactory in particular because, on the one hand, when the closing force is sufficient, an excessive opening pressure is required and, on the other hand, the sealing quality due to particles that are between the valve ring wall and the can set by this enclosed surface can be affected. Given the small size of the parts of such pumps - the diameter of a bellows is approximately 12 to 15 mm and its length is approximately 30 mm - the manufacturing accuracy is often not sufficient to ensure the required closing quality of the valves, especially for liquid media. Even small deviations in the hundredths of a millimeter range can lead to rejects.

The other embodiments of intake valves, which can be found in the same reference, and in which tongue-like or plate-like closing members are provided for covering axial bores, do not meet the requirements placed on the functional reliability of such pumps.

The sealing or closing quality of the valves is also crucial for the possibility, especially on the Automatic assembly machines perform a dry function test, in which these valves must prove to be airtight. In addition, containers that are equipped with such dosing and spray pumps are subjected to safety tests, in which the valves must also prove to be reliably closed in order to pass.

Another decisive property that such metering and spray pumps must have is their economic producibility. Because they are produced in very large numbers, it is necessary that they consist of as few individual parts as possible with economically justifiable manufacturing tolerances, which should be easy to assemble.

Furthermore, with such metering and spray pumps, the occurrence of a vacuum in the container must be avoided during the suction stroke by inflowing air.

In a known metering pump with pump bellows (DE-PS 35 09 178 A1) an annular sealing lip is arranged for this latter purpose as a radial outward extension of the lowest fold of the bellows at the upper end of an annular collar forming the lower end of the bellows. This ring collar sealingly encloses an annular collar of the housing part connected or connectable to the container. The ring-shaped sealing lip lies in its rest position due to its initial shape sealingly against the cylindrical inside of an annular wall which is integrally formed on the housing part which can be connected to the bottle neck of a container. The function of this sealing lip is that of a one-way valve which, on the one hand, pumps air through ventilation openings into the interior of the pump Lets the container flow and this, on the other hand, ensures that nothing of the liquid or pasty container contents can get past the outside of the bellows. The ventilation openings, through which the sucked-in air can flow past the annular sealing lip into the interior of the container, are arranged in an end wall of the housing part which can be connected to the container. As a rule, this housing part is provided with an internal thread which can be screwed onto a corresponding external thread of the neck of a can or bottle-shaped container.

In the case of can-shaped or bottle-shaped containers which, owing to the hardness of their material and / or the wall thickness, have a high dimensional stability which can withstand even greater negative pressures, there is a risk that the suction function will be impaired if there is insufficient ventilation.
However, for containers that are so thin-walled and / or consist of flexible or resilient material that they deform even at low negative pressures, the previously known shapes of the annular sealing lips are not sufficient to avoid container deformation. This is especially true when the annular sealing lip, in order to achieve a radially compact design, should have only a relatively small radial expansion, which means that its elasticity in form with regard to the opening and closing interaction with the inner surface of the ring wall surrounding it is insufficient.

In addition, with thin-walled or easily deformable containers, there is also the risk that the annular sealing lip inadvertently, for example in the case of a toothpaste tube, due to an intended or unintentional radial pressure on the container wall Locking direction is exposed to a much greater pressure than is normally the case when the container is placed horizontally with the dosing pump attached or turned upside down. In this case, too, the conventional forms of the annular sealing lip are no longer suitable for providing their blocking effect and for withstanding the increased pressure in the dispensing direction. With the shape or cross-sectional design alone, the interplay between air intake at a relatively low vacuum and tight shut-off in the opposite direction under increased pressure can no longer be solved.

The invention is therefore based on the object to improve a metering and spray pump of the type mentioned with as few simple, easy to assemble and reliably working individual parts, on which the functional elements can be molded, in such a way that a high level of functional reliability, in particular adequate , verifiable closing quality even in the dry state with low opening force of the discharge and suction valves.

This object is achieved according to the invention in that the cylindrical valve ring wall of the dispensing valve and the cylindrical valve ring wall of the suction valve, which is also provided with a closed end wall, with their open, radially elastic end or edge edges each abut against conical or spherical shell surfaces of a housing part and
- That both valve ring walls are connected to the bellows in a resiliently movable manner in the axial direction, in that the valve ring wall of the dispensing valve has a substantially radially projecting outward from the pump pressure of the pump medium in the opening direction actable elastic ring shoulder is integrally connected to the discharge-side end of the bellows and in that the valve ring wall of the suction valve is connected in one piece to the suction-side end of the bellows by an axially and radially elastic connecting ring and connecting webs.
Due to the simultaneous presence of a radial elasticity and an axial elasticity, an initially linear contact between the valve ring wall and the conical or dome-shaped lateral surface enclosed by it creates a flat contact during the closing process, in that the edge of the valve ring wall pushes onto the lateral surface in the axial direction, so that any particles in between can be pushed away. The valve ring wall can also adapt easily and better sealing to the shape of the lateral surface even in an inclined position.
By means of these two elasticities of the valve ring walls which are effective in different directions, the closing forces increase, quasi double, and decrease the opening forces, quasi halve. As a result, considerably greater scope is also gained with regard to the required manufacturing precision.

In addition, the opening force of the dispensing valve is additionally reduced in that the pressure prevailing in the medium during the dispensing stroke simultaneously acts on the elastic annular shoulder in the axial opening direction.
While it would also be possible to manufacture the valve ring wall of the intake valve as a separate component and to connect it to the bellows by means of appropriate connecting means, the solution according to claim 2 offers the considerable advantage of integrally molding the valve ring wall and its connecting elements on the bellows. In addition, the selected connecting elements also ensure high elasticity and functional flexibility which are advantageous for the desired mode of operation.

The embodiment according to claim 3 improves the mode of operation in that the thrust force acting on the bellows during the delivery stroke is kept away from the valve ring wall.

The arrangement of claim 4 also serves the advantageous development of the invention in that the sealing of the annular chamber leading to the dispensing mouthpiece, which surrounds the valve ring wall, has no adverse effect on the function of the valve ring wall.

The refinements of claims 5 and 6 favor the functional closing function of the intake valve.

So that on the one hand, due to the negative pressure that arises inside the container during the suction stroke, no unwanted container deformation occurs even with thin-walled or easily deformable containers and, on the other hand, when the external pressure is exerted on the container wall, as long as it does not exceed the destruction limit, nothing of the container contents will escape to the outside can, the embodiment according to claim 7 is provided.

The particular advantage achieved by this is that the bellows is displaced in the opening direction by the bellows even during the delivery stroke and does not return to its closed position until the end of the suction stroke. On the other hand, there is at the same time the possibility of making the ring rib so dimensionally stable that it withstands an increased pressure in the opposite direction, ie in the blocking direction, and does not allow any medium to escape past it.

The embodiment of the invention according to claim 8 also ensures that when a pressure acting on the outside of the container wall occurs or when a drop occurs, nothing from the container contents can pass through the bellows and the dispensing valve to the dispensing mouthpiece.
In the known metering pumps of the generic type, this security is also not provided because the closing member of the outlet-side outlet valve generally rests on its valve seat surface with only a slight spring pressure, so that only a small force acting in the direction of dispensing is sufficient to open it.

Claims 9 to 15 relate to advantageous refinements of the invention which, as will be explained in more detail with reference to the exemplary embodiment described in more detail below, contribute in particular to achieving a compact, simple structural design and to simple, functionally reliable handling.

It should also be noted that the solution according to the invention does not result in any additional costs or space requirements, so that an inexpensive and more compact design is possible.

Fig. 1

eine Dosier-und Spraypumpe im Schnitt in Ruhestellung;

Fig. 2

einen vergrößerten Ausschnitt aus Fig. 1;

Fig. 3

die Dosier-und Spraypumpe der Fig. 1 in Schnittdarstellung am Ende eines Ausgabepumphubes;

Fig. 4

das Ansaugventil in vergrößerter Schnittdarstellung;

Fig. 5

die Ansicht V aus Fig. 4;

Fig. 6

das Ansaugventil in vergrößerter, teilweise geschnittener Perspektivdarstellung.

The drawing shows:

Fig. 1

a dosing and spray pump in the rest position;

Fig. 2

an enlarged section of Fig. 1;

Fig. 3

the metering and spray pump of Figure 1 in a sectional view at the end of a dispensing pump stroke.

Fig. 4

the suction valve in an enlarged sectional view;

Fig. 5

the view V from Fig. 4;

Fig. 6

the suction valve in an enlarged, partially sectioned perspective view.

The drawing shows a metering and spray pump, which is used to dispense liquid or low-viscosity, in particular pasty, substances from bottle-like or can-like containers, in their usual position of use or handling. It consists of a first upper first housing part 1 and a second lower housing part 2, - the top and bottom of the drawing also corresponding to the normal handling position, - and a bellows 3 connecting between these two housing parts 1 and 2.
While the two housing parts 1, 2 are each made of dimensionally stable plastic, the bellows 3 consists of a rubber-like elastic plastic, the elasticity of which, however, is of sufficient dimensional stability and, on the other hand, is able to provide a sufficiently high restoring force for the initial strokes. Both the bellows 3 and the two housing parts 1 and 2 are each made in one piece by injection molding.
The housing part 1 is provided with a laterally radially projecting, tubular dispensing mouthpiece 4, the dispensing channel 5 of which opens into an annular chamber 6, which is arranged between an outer cylindrical guide wall 7 and an inner, conically tapering annular wall 8 and through an end wall connecting these two 9 is closed at the top. On this end wall 9 a closure cap 11 provided with a snap attachment 10, which closes the upper end of the inner ring wall 8, is attached by means of a snap-in or snap connection.

The bellows 3 is provided at the end of its uppermost annular fold 3/1 with an outer sealing ring 12 which rests on the inner surface of this guide wall 7 in a sealing manner directly above a thin rib 13 which runs around the inside of the guide wall 7. Above the outer sealing ring 12, a radially outwardly projecting thin-walled and therefore axially elastic ring shoulder 14 is arranged at a small axial distance therefrom, via which an essentially cylindrical and radially elastic valve ring wall 15 is made in one piece with the bellows 3 or with the sealing ring 12 connected is. This valve ring wall 15 lies with its upper end edge 16 with a certain both axially and radially effective prestress sealing against the conical outer surface 17 of the inner ring wall 8 and forms on the one hand in cooperation with this inner ring wall 8 forms the movable closing member of a dispensing valve 18 and on the other hand Partition between the annular chamber 6 and the interior 19 of the bellows 3.

The interior 19 of the bellows 3 is largely filled by a hollow cylindrical displacement body 16, which is stepped several times in diameter, which is integrally formed as an extension on the inner ring wall 8 of the housing part 1 and has a radial distance over its entire length from the wall of the bellows 3 has, so that the medium to be dispensed can flow between the displacement body 20 and the wall of the bellows 3.

Only in the area of the uppermost inner annular fold 3/2 of the bellows 3 is the displacement body 20 provided with a plurality of support cams 21 arranged distributed around its circumference, which are axially supported on an inner radial shoulder 22 of this annular fold 3/2.
These support cams 21 have the task of keeping the effective pump pressure in the direction of arrow 67 at the output stroke of the housing part 1 from the upper section of the bellows 3, but in particular from the valve ring wall 15 and the ring shoulder 14, so that their function is not impaired.
At its lower end, the displacement body 20 has a conically widening edge section 23 which is closed by an end wall 25 which is offset axially upwards relative to the edge 24. This displacement body 20, insofar as it projects as an extension of the conical ring wall 8 into the bellows 3, is provided with a smaller diameter than the ring wall 8.

The guide wall 7 of the housing part 1 is provided at its lower end with an inwardly projecting ring collar 26, which engages positively under an outwardly projecting ring collar 27 a guide wall 28 of the housing part 2 so that the two guide walls 7 and 28 are telescopically guided and one another enable telescopic axial relative movement against each other, which corresponds to a pump stroke. This axial relative movement is limited by axial stops which are formed in one direction by the two annular collars 26 and 27 and in the other direction by an annular shoulder 29 of the housing 2, on which the annular collar 26 of the housing part 1 is seated at the end of the pump stroke.
The annular collar 27 of the housing part 2 is provided at the top with a collar 30 tapered in diameter with respect to the rib 13 of the guide wall 7, through which collar 30 the assembly of the sealing ring 12 is pushed from below over the rib 13. The task of the rib 13 is to keep the sealing ring 12 in the position shown in the drawing.

The diameter of the ring collars 26, 27 and the diameter of the guide walls 7, 28 are coordinated so that, on the one hand, adequate guidance between the two housing parts 1 and 2 is ensured, but on the other hand, at the respective contact points, there is sufficient air exchange between the environment and the common housing interior 31 can take place during the lifting movements.
The guide wall 28, which encloses the bellows 3 with a small radial distance, has a diameter widening 33 below the rest position shown in FIGS. 1 and 2 and in the axial range of motion of the second lowest outer annular fold 3/3 of the bellows 3, which in combination with a on this annular fold 3/3 arranged annular rib 34, a positively operated ventilation valve between the common interior 31 and a storage space 36 lying in the area of the diameter extension 33.

The guide wall 28 is integrally formed on an annular web 37 of the housing part 2, like all other components, except for the dispensing mouthpiece 4, concentrically to the common axis 32. On its axial opposite side, a screw-on cap 39 provided with an internal thread 38 is formed, through which the entire metering and spray pump can be screwed onto the thread neck, not shown, of a can- or bottle-like paste or liquid container.

A cylindrical pot body 40 is also formed concentrically on the ring web 37 in the interior of the screw-on cap 39, the end wall 41 of which has a central, nipple-like, upwardly directed hollow body 42 with a suction bore 45 and with a spherical surface 43 serving as a valve seat and with a downward intake manifold 44 is provided. The latter can be provided with a suction hose, not shown, for sucking in a liquid medium. Containers with pasty substances are usually provided with a trailing piston.
In this pot body 40, there is a cylinder wall 46 which is integrally connected to the bellows 3 and is integrally formed on the upper end of which a radially inwardly projecting annular collar 47 and the annular folds of the bellows are integrally formed.

The ring rib 34 already mentioned has the task, during the suction stroke of the bellows 3, that is, when the bellows 3 returns from the pump stroke end position shown in FIG. 2 in the direction of arrow 48 to the rest position shown in FIG. 1, from which the bellows 3 surrounding interior 31, which is also connected to the outside atmosphere by the non-airtight connection between the two guide walls 7 and 28, to allow air to pass through ventilation openings 49 of the annular web 37 and through them into the interior of the screw cap 39 or into the container , on which the screw cap 39 is screwed. However, this annular rib 34 also has the task of preventing the liquid or pasty medium in the container from being able to get into the interior 31 if the container takes a horizontal position instead of the normal vertical position, for example falls over, or if the Container is provided with a deformable wall and on this from the outside Pressure is exerted. It therefore has the task of sealingly separating the storage space 36, which is permanently connected to the container through the ventilation openings 49, from the interior 31.

The annular rib 34 thus forms, in cooperation with the inner surface of the guide wall 28, a ventilation valve which is open during the lifting movements of the first housing part 1 and closed in the rest position and which has the property of withstanding a relatively large pressure in the blocking direction and suction air in the suction direction during the suction stroke of the bellows let through without creating a vacuum inside the container that would be sufficient to deform thin and easily deformable container walls inwards.

The shape described above, which causes no additional costs, also achieves a radially very compact design.

The cylinder wall 46 of the bellows 3 has a reinforced front edge 50 seated on the bottom wall 41 of the pot body 40, on which a first group of three finger-like connecting webs 51, which are directed axially upwards and are offset by 120 ° to one another in the circumferential direction, are formed. The upper ends of these connecting webs 51 are integrally connected to a both radially and axially elastic connecting ring 52, which in turn is attached by a second group of connecting webs 53 which run essentially radially and are each offset by 60 ° with respect to the connecting webs 51 cylindrical valve ring wall 54 is connected and is provided at its upper end with an end wall 57 closing its cavity 56. The valve ring wall 54 is thin-walled, and it sits with its lower, open edge 55 radially resiliently and sealingly on the spherical shell surface 43 of the hollow body 42.
The inner diameter of the valve ring wall 54 is approximately twice as large as the diameter of the suction bore 45 but only slightly smaller than the outer diameter of the hollow body 42.
Due to the radial as well as axial elasticity of the connecting ring 52, the valve ring wall 54 can always seal against the lateral surface 43, even if it is inaccurate or in an inclined position, even if this were conical instead of dome-shaped. This elasticity or spring property of the connecting ring 52 also ensures that the valve ring wall 54 automatically returns to its closed position after a suction stroke has ended. The lateral surface 43 of the hollow body 42 and the valve ring wall 54 thus form the suction valve 58 of the metering and spray pump, while the valve ring wall 15 forms the output valve 18 in cooperation with the inner ring wall 8 of the upper housing part 1.

While in the preferred embodiment described above the valve ring wall 54, the connecting webs 51, 53 and the connecting ring 52 are integrally formed on the lower end edge 50 of the bellows 3, there is also the possibility of providing the outer connecting webs 51 with a further, preferably more stable ring, which is inserted into a corresponding receptacle of the front edge 50. The valve ring wall 54 could thus be produced together with the connecting webs 51, 53, the connecting ring 52 and the additional ring as a separate component.

The material elasticity of the bellows 3 also causes the first housing part 1 to automatically return to its extended rest position as soon as no more axial force is exerted on it, i.e. when it is released after an output stroke in the direction of arrow 67. This return movement in the direction of arrow 48 is the suction stroke, during which the valve ring wall 54 is lifted axially resiliently from the lateral surface 43 so that medium can flow out of the container into the interior 60 of the cylinder wall 46 and the annular folds of the bellows 3.

Since both the suction valve 58 and the discharge valve 18 occur when a in the direction of arrow 48, i.e. open in the output direction of effective pressure and this pressure can also arise from the fact that thin deformable walls of the container, on which the metering and spray pump is placed, are pressed together, there is a risk in such thin-walled or provided with deformable walls containers that through the mentioned pressing pressure, which deforms the container walls, uncontrolled medium is pressed out through the metering and spray pump. The same can also happen if a container provided with such a metering and spray pump falls headfirst on a hard surface.

In order to prevent this undesired leakage or squeezing out of medium, the intake valve 58 in the form of the annular collar 47 and the conical lower edge section 23 of the displacement body 20 is followed by a check valve 59 through which the interior 60 of the cylinder wall 46 from the interior 19 of the annular folds of the bellows 3 is sealed off as long as the upper housing part 1 is in its upper end position, which is shown in FIGS. 1 and 2. In this position or functional position namely, the conical outer surface of the edge section 23 is in sealing contact with the annular collar 23. However, as soon as the pump stroke, ie the movement of the upper housing part 1 in the direction of arrow 57, this conical edge section 23 is moved downward from the annular collar 47, so that medium between the annular collar 47 and the smaller displacement body 20 in diameter in this area can flow the interior 19 of the bellows 3.
The displacer 20 presses during its downward movement in the direction of arrow 57, the medium located in the interior 60 first into the interior 19 of the bellows 3 and then through the valve ring wall 15 of the discharge valve 18 into the annular chamber 6 and then into the discharge channel 5 of the Dispensing mouthpiece 4.

Because the valve ring wall 15 is formed on the outer edge of the likewise thin-walled and therefore elastic in the axial direction annular shoulder 14, it is also able to execute axial movements relative to the lateral surface 17 of the ring wall 8, so that the opening and closing processes can be carried out more easily and quickly. However, it is also important that the pressure which builds up in the medium during the discharge stroke has an effect on the radial annular shoulder 14 in the opening direction, and thus the discharge valve 18 opens faster.

The displacement body 20 therefore not only has the task of keeping the interior 19 of the bellows 3 as small as possible in the area of the annular folds, but it also serves as a check valve when it has reached its upper end position.

Another function that the displacement body 20 takes over is that the conical edge section 23, as far as it extends below the collar 47, in cooperation with the cylinder wall 46 takes over additional guidance of the upper housing part 1 in the lower housing part 2. For this purpose, the part of the edge section 23 which extends below the annular collar 47 is widened to a diameter which corresponds at least approximately to the inside diameter of the cylinder wall 46. So that the medium to be conveyed from the interior 60 into the interior 19 can flow relatively unhindered upwards along the cylinder wall 46, the part of the edge section 23 which extends in the rest position below the annular collar 47 is provided on its circumference with a plurality of slot-shaped recesses 62 which but end on a diameter that is smaller than the inner diameter of the collar 47 so that the check valve effect is maintained.

Due to the fact that this leading edge portion 23 is offset axially by the stroke length from the likewise leading collar 26 of the guide wall 7, the two housing parts 1, 2 are also guided into one another so well in the rest position (FIG. 1) that no obstructions for the axial stroke movement can occur without the need for additional guide surfaces on the two housing parts 1 and 2 which overlap in the axial direction over a longer distance.

With the design according to the invention, a metering and spray pump for liquid and low-viscosity or pasty substances is created, which ensures a trouble-free pumping function with relatively wide manufacturing tolerances and can also be used advantageously in thin-walled, easily deformable bottle- or can-like containers which ensures that there is no deformation of the container walls when it is handled correctly and that uncontrolled squeezing or outflow of medium from the container through the metering and spray pump is prevented by improper application of a pressing pressure on a flexible container wall. Due to the improved pump function, which can be attributed to the special design of the two pump valves 48 and 54, the metering and spray pump according to the invention can also be used universally both for liquid and for pasty media. The initial suction of medium from a container takes place safely after only a few pumping strokes, and a dry function check of the entire pump is possible.

It is also readily possible to use the design of the valves 18, 58 according to the invention in a metering and spray pump in which the container of the medium is formed directly on the housing part 2 instead of having a threaded cap 39.

Claims (15)

Dosing and spray pump for dispensing liquid, low-viscosity and pasty, substances from bottle or can-like containers with a bellows made of elastic plastic, which is arranged connecting between two telescopically movable housing parts made of dimensionally stable plastic and as a dispensing valve at one end a sleeve-like, valve ring wall has, which encloses the circumferential surface of a molded on the first housing part performing the round ring wall in a sealing and liftable manner and which, as an intake valve, also has a sleeve-shaped valve ring wall at its other end, which seals and can be lifted off on the circumferential surface of a round valve seat formed on the second housing part is present, through which the pumping medium is sucked out of the container into the bellows,
characterized,
that the cylindrical valve ring wall (15) of the dispensing valve (18) and the also provided with a closed end wall (57), also cylindrical valve ring wall (54) of the suction valve with their open, radially elastic end or edge edges (16; 55) each enclosing conical or dome-like outer surfaces (17, 43) of a housing part (8; 42) and
- That both valve ring walls (15, 54) are resiliently connected in the axial direction to the bellows (3) by the valve ring wall (15) of the Dispensing valve (18) is connected in one piece to the discharge-side end of the bellows (17) and by means of the valve ring wall (5) of the suction valve (58) via a resilient annular shoulder (14) which projects essentially radially outward and can be acted upon by the pump pressure of the pump medium in the opening direction. is connected in one piece to the suction-side end of the bellows (17) by an axially and radially elastic connecting ring (52) and connecting webs (51, 53). Dosing and spray pump according to claim 1, characterized in that the connecting ring (52) via a first group of at least three circumferentially distributed finger-like connecting webs (51) with the suction-side end section of the bellows (3) and via a second group of at least three is connected to the valve ring wall (5) of the intake valve (58) with respect to the connecting webs (53) of the first group, offset in the circumferential direction. Dosing and spray pump according to claim 2, characterized in that on an extension protruding into the bellows (3) of the inner ring wall (8) enclosed by the valve ring wall (15) of the housing part (1) carrying out the pump strokes is provided with support cams (21) , which bear axially entraining in the axial direction of the delivery stroke on the inside of the bellows (3). Dosing and spray pump according to one of claims 1 to 3, characterized in that in the axial direction between the valve ring wall (15) of the dispensing valve (18) and the support cams (21) on the circumference of the bellows (3) a sealing ring (12) is arranged, which is pushed from the open side behind a circumferential rib (13) of a cylindrical guide wall (7) of the first housing part (1) is and lies on the inside of this guide wall (7) sealing all around. Dosing and spray pump according to claim 1, characterized in that the suction-side valve seat of the second housing part (2) is designed as a nipple-like hollow body (42) which projects into the suction-side end section (50) of the bellows (3) and has a central suction bore ( 45) is provided. Dosing and spray pump according to claim 5, characterized in that the diameter of the suction bore (45) corresponds approximately to half the diameter of the valve ring wall (54) surrounding it. Dosing and spray pump according to one of claims 1 to 6, characterized in that on the circumference of an outer annular fold (3/3) of the bellows (3) enclosed by a cylindrical guide wall (28) of the second housing part (2) has a circumferential annular rib (34 ) is formed, which rests on the inner surface of the guide wall (28) when the bellows (3) is at rest and which is axially released during the delivery stroke of the bellows (3) into an enlarged area (33) of the guide wall (28). Dosing and spray pump according to one of Claims 1 to 7, characterized in that the bellows (3) has at its suction end a shut-off valve (59) which is connected downstream of the suction valve (54) and blocks in the dispensing direction, the immovable annular collar (47) is integrally formed on the bellows and the movable closing member (23) is connected to the first housing part (1) so that it opens with each pump stroke. Dosing and spray pump according to Claim 8, characterized in that the bellows (3) is provided with a cylinder wall (46) which is designed as a lower extension and which, as part of the shut-off valve (56), has an annular collar (47) on which a conical outward connection projecting edge section (23) of a bellows (3) concentrically projecting, at its lower end designed as a closing element of the check valve (59) connected to the first housing part connecting body (20) sealingly seated in the valve seat. Dosing and spray pump according to claim 8, characterized in that the cylinder wall (46) extends axially at least over the length of a pump stroke and is arranged in a cylindrical pot body (40) of the second housing part (2) connected or connectable to the container. Dosing and spray pump according to claim 10, characterized in that the edge section (23) of the connecting body (20) connected to the first housing part (1) is guided with little radial play in the cylinder wall (46). Dosing and spray pump according to claim 10, characterized in that the pot body (40) is arranged inside a screw cap (39) provided with an internal thread (38). Dosing and spray pump according to one of claims 8 to 12, characterized in that the extension body (20) is designed as a displacement piston which projects through the bellows (3) with radial play. Dosing and spray pump according to one of claims 8 to 13, characterized in that the two housing parts (1, 2) each have telescoping guide walls (7, 28), the length of which corresponds to the length of the pump, and the ring collars at their mutually facing ends (26, 27), which engage one another. Dosing and spray pump according to claim 14, characterized in that the extension body (20) of the first housing part (1) is approximately the pump length longer than the guide wall (7) of this housing part (1).

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