EP0492354B1 - Dosing and spraying pump for dispensing liquid, low viscous and paste-like material - Google Patents

Dosing and spraying pump for dispensing liquid, low viscous and paste-like material Download PDF

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Publication number
EP0492354B1
EP0492354B1 EP91121564A EP91121564A EP0492354B1 EP 0492354 B1 EP0492354 B1 EP 0492354B1 EP 91121564 A EP91121564 A EP 91121564A EP 91121564 A EP91121564 A EP 91121564A EP 0492354 B1 EP0492354 B1 EP 0492354B1
Authority
EP
European Patent Office
Prior art keywords
valve
bellows
wall
dosing
ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91121564A
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German (de)
French (fr)
Other versions
EP0492354A1 (en
Inventor
Raimund Andris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Raimund Andris GmbH and Co KG
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Raimund Andris GmbH and Co KG
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Publication of EP0492354A1 publication Critical patent/EP0492354A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B45/00Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/02Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having bellows
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/0005Components or details
    • B05B11/0062Outlet valves actuated by the pressure of the fluid to be sprayed
    • B05B11/007Outlet valves actuated by the pressure of the fluid to be sprayed being opened by deformation of a sealing element made of resiliently deformable material, e.g. flaps, skirts, duck-bill valves
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001Piston pumps
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1028Pumps having a pumping chamber with a deformable wall
    • B05B11/1035Pumps having a pumping chamber with a deformable wall the pumping chamber being a bellow
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042Components or details
    • B05B11/1064Pump inlet and outlet valve elements integrally formed of a deformable material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042Components or details
    • B05B11/1066Pump inlet valves
    • B05B11/1067Pump inlet valves actuated by pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042Components or details
    • B05B11/1066Pump inlet valves
    • B05B11/1067Pump inlet valves actuated by pressure
    • B05B11/1069Pump inlet valves actuated by pressure the valve being made of a resiliently deformable material or being urged in a closed position by a spring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042Components or details
    • B05B11/1073Springs
    • B05B11/1074Springs located outside pump chambers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042Components or details
    • B05B11/1073Springs
    • B05B11/1077Springs characterised by a particular shape or material

Definitions

  • 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 between 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 surrounds the circumferential surface of a round ring wall formed on the first housing part which carries out 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 on the lateral surface of a round valve seat formed on the second housing part sealingly and removably abuts, through which the pumping medium is sucked out of the container into the bellows.
  • valve ring wall sealingly enclosing the cylindrical jacket surface of an attachment forming the valve seat of the dispensing valve is only radially elastic and thus only radial removable.
  • 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.
  • valves 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.
  • containers that are equipped with such metering and spray pumps are subjected to drop tests for safety reasons, in which the valves must also prove to close reliably in order to pass.
  • 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. In its rest position, the ring-shaped sealing lip lies sealingly against the cylindrical inside of a ring wall, which is integrally formed on the housing part which can be connected to the bottle neck of a container.
  • 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.
  • this housing part is provided with an internal thread which can be screwed onto a corresponding external thread on the neck of a can-shaped or bottle-shaped container.
  • 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 subjected to a much greater pressure than is normally the case when the container with the dosing pump attached is placed horizontally or upside down.
  • 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.
  • 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.
  • 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 peripheral edges each abut 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 an essentially radially outwardly projecting pressure from the pumping medium in the opening direction actable, elastic ring shoulder is integrally connected to the discharge end of the bellows and in that the valve ring wall of the suction valve is integrally connected to the suction end of the bellows by an axially and radially elastic connecting ring and connecting webs.
  • valve ring wall Due to the simultaneous presence of radial elasticity and axial elasticity, an initially linear contact between the valve ring wall and the conical or dome-shaped lateral surface enclosed by it creates a surface 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.
  • the opening force of the dispensing valve is additionally reduced by the fact that the pressure prevailing in the medium during the dispensing stroke also acts on the elastic annular shoulder in the axial opening direction.
  • the solution according to claim 2 offers the considerable advantage of integrally molding the valve ring wall and its connecting elements on the bellows.
  • 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 particular advantage that is achieved is that the bellows is displaced in the opening direction by the bellows even during the discharge stroke and only returns to its closed position at the end of the suction stroke.
  • 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.
  • 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 construction and to simple, functionally reliable handling.
  • 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 arranged 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 is fitted with a snap or snap connection 10 provided with a snap cap 10 which closes the upper end of the inner ring wall 8.
  • the bellows 3 is provided at the end of its uppermost annular fold 3/1 with an outer sealing ring 12, which rests sealingly on the inner surface of this guide wall 7 directly above a thin rib 13 which runs around the inside of the guide wall 7.
  • an outer sealing ring 12 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 integrally formed 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 sealingly 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 forms the 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.
  • the displacement body 20 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.
  • the displacement body 20 At its lower end, 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 is provided with a smaller diameter than the ring wall 8 insofar as it projects as an extension of the conical ring wall 8 into the bellows 3.
  • 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 of a guide wall 28 of the housing part 2 so that the two guide walls 7 and 28 are telescopically guided into one another and one 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 ring collars 26 and 27 and in the other direction by an annular shoulder 29 of the housing 2, on which the 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 tapering 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 hold 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 so matched to one another 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 surroundings and the common housing interior 31 can take place during the lifting movements.
  • the guide wall 28, which surrounds the bellows 3 with a small radial distance, has a diameter widening 33 below the rest position shown in FIGS.
  • 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.
  • a screw-on cap 39 which is provided with an internal thread 38, is formed on the opposite axial side thereof, 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 integrally formed on the ring web 37 inside 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 which has 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.
  • 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 already mentioned ring rib 34 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 ring land 37 and through them into the interior of the screw cap 39 or into the container , on which the screw cap 39 is screwed.
  • 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 constantly 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 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 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 and 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 completed suction stroke.
  • 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 dispensing valve 18 in cooperation with the inner ring wall 8 of the upper housing part 1.
  • valve ring wall 54 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, it is also possible to provide 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 brings about an automatic return of the first housing part 1 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.
  • 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.
  • 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.
  • 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.
  • the conical outer surface of the edge section 23 is in sealing contact with the collar 23.
  • 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 perform 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 that 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.
  • 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.
  • the part of the edge section 23 which extends in the rest position below the annular collar 47 is provided on its periphery 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.
  • this leading edge section 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 additional guide surfaces on the two housing parts 1 and 2 overlapping in the axial direction over a longer distance being required.
  • a metering and spray pump for liquid and low-viscosity or pasty substances is created, which guarantees 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 the container walls are not deformed when handled correctly and that uncontrolled pressing out 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.
  • 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.
  • valves 18, 58 in which the container of the medium is formed directly on the housing part 2 instead of having a threaded cap 39.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Closures For Containers (AREA)

Description

Die Erfindung betrifft eine Dosier- und Spraypumpe zur Abgabe flüssiger, niederviskoser und pastöser Stoffe aus flaschen- oder dosenartigen Behältern, mit einem Faltenbalg aus elastischem Kunststoff, der verbindend zwischen zwei teleskopartig gegeneinander beweglichen Gehäuseteilen aus formstabilem Kunststoff angeordnet ist und der als Ausgabeventil am einen Ende eine hülsenartige Ventilringwand aufweist, welche die Mantelfläche einer an dem die Pumphübe ausführenden ersten Gehäuseteil angeformten, runden Ringwand dichtend und abhebbar umschließt und der als Ansaugventil an seinem anderen Ende ebenfalls eine hülsenförmige Ventilringwand aufweist, die an der Mantelfläche eines runden, am zweiten Gehäuseteil angeformten Ventilsitzes dichtend und abhebbar anliegt, durch welchen hindurch das Pumpmedium aus dem Behälter in den Faltenbalg angesaugt wird.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 between 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 surrounds the circumferential surface of a round ring wall formed on the first housing part which carries out 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 on the lateral surface of a round valve seat formed on the second housing part sealingly and removably abuts, through which the pumping medium is sucked out of the container into the bellows.

Bei einer bekannten Dosier- und Spraypumpe der gattungsgemäßen Art (DE-A-38 28 811) ist die an der zylindrischen Mantelfläche eines den Ventilsitz des Ausgabeventils bildenden Ansatzes dichtend umschließende Ventilringwand nur radial elastisch und somit auch nur radial abhebbar. Auch die Ventilringwände der dort in unterschiedlichen Ausführungen vorgesehenen Ausaugventile lassen sich während des Ansaughubs nur in radialer Richtung von den ihren Ventilsitz bildenden zylindrischen Mantelflächen elastisch abheben, damit das angesaugte Medium zwischen der betreffenden Mantelfläche und der sie umschließenden Ventilringwand in den Innenraum des Faltenbalgs hineinströmen kann.In a known metering and spray pump of the generic type (DE-A-38 28 811), the valve ring wall sealingly enclosing the cylindrical jacket surface of an attachment forming the valve seat of the dispensing valve is only radially elastic and thus only radial removable. 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 der Praxis haben sich derartige Ausgabe- und Ansaugventile für Dosier- und Spraypumpen der gattungsgemäßen Art insbesondere deshalb als unbefriedigend erwiesen, weil einerseits bei ausreichender Schließkraft ein zu großer öffnungsdruck erforderlich ist und weil andrerseits die Dichtqualität durch Partikel, die sich zwischen die Ventilringwand und die von dieser umschlossenen Mantelfläche setzen können, beeinträchtigt werden kann. Bei der gegebenen Kleinheit der Teile solcher Pumpen -der Durchmesser eines Faltenbalgs beträgt etwa 12 bis 15 mm und seine Länge etwa 30 mm -, reicht auch oft die Herstellungsgenauigkeit nicht aus, um die erforderliche Schließqualität der Ventile, insbesondere für flüssige Medien, zu gewährleisten. Schon geringe, im Hundertstel-mm-Bereich liegende Maßabweichungen können zu Ausschuß führen.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 outer 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.

Auch die anderen der gleichen Fundstelle entnehmbaren Ausführungsformen von Ansaugventilen, bei denen zungen- oder plättchenartige Schließorgane zum Abdecken von Axialbohrungen vorgesehen sind, genügen nicht den an die Funktionssicherheit solcher Pumpen gestellten Anforderungen.The other embodiments of intake valves, which can be found in the same reference, and in which tongue-like or plate-like closing elements are provided for covering axial bores, do not meet the requirements placed on the functional reliability of such pumps.

Die Dicht- bzw. Schließqualität der Ventile, ist auch ausschlaggebend für die Möglichkeit, insbesondere auf dem Montageautomaten eine trockene Funktionsprüfung durchzuführen, bei der sich diese Ventile als luftdicht erweisen müssen. Zudem werden Behälter, die mit solchen Dosier- und Spraypumpen ausgerüstet sind, sicherheitshalber Falltests unterzogen, bei denen sich die Ventile ebenfalls als zuverlässig schließend erweisen müssen, um zu bestehen.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 metering and spray pumps are subjected to drop tests for safety reasons, in which the valves must also prove to close reliably in order to pass.

Eine weitere entscheidende Eigenschaft, die derartige Dosier-und Spraypumpen haben müssen, ist ihre wirtschaftliche Herstellbarkeit. Weil sie in sehr großen Stückzahlen produziert werden, ist es erforderlich, daß sie aus möglichst wenig Einzelteilen mit wirtschaftlich vertretbaren Fertigungstoleranzen bestehen, die möglichst einfach montierbar sein sollen.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.

Des weiteren muß bei solchen Dosier- und Spraypumpen während des Ansaughubs durch einströmende Luft die Entstehung eines Vakuums im Behälter vermieden werden.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.

Bei einer bekannten Dosierpumpe mit Pumpenbalg (DE-A-35 09 178) ist für diesen letztgenannten Zweck eine ringartige Dichtungslippe als radiale nach außen gerichtete Verlängerung der untersten Falte des Faltenbalges am oberen Ende eines das untere Ende des Faltenbalgs bildenden Ringbunds angeordnet. Dieser Ringbund umschließt dichtend einen ringförmigen Kragen des mit dem Behälter verbundenen bzw. verbindbaren Gehäuseteils. Die ringförmige Dichtungslippe liegt in ihrer Ruhelage auf Grund ihrer Ausgangsform dichtend an der zylindrischen Innenseite einer Ringwand an, die einstückig an dem mit dem Flaschenhals eines Behälters verbindbaren Gehäuseteils angeformt ist. Die Funktion dieser Dichtungslippe ist die eines Einwegventils, welches einerseits beim Ansaughub der Pumpe Luft durch Belüftungsöffnungen in das Innere des Behälters strömen läßt und das aber andererseits dafür sorgt, daß von dem flüssigen oder pastösen Behälterinhalt nichts an der Außenseite des Faltenbalgs vorbei nach außen gelangen kann. Die Belüftungsöffnungen, durch welche die angesaugte Luft an der ringförmigen Dichtungslippe vorbei in das Behälterinnere strömen kann, sind in einer Stirnwand des mit dem Behälter verbindbaren Gehäuseteils angeordnet. In der Regel ist dieser Gehäuseteil mit einem Innengewinde versehen, das auf ein entsprechendes Außengewinde des Halses eines dosen- oder flaschenförmigen Behälters aufgeschraubt werden kann.In a known metering pump with pump bellows (DE-A-35 09 178), 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. In its rest position, the ring-shaped sealing lip lies sealingly against the cylindrical inside of a ring 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 on the neck of a can-shaped or bottle-shaped container.

Bei dosen- oder flaschenförmigen Behältern, die auf Grund der Härte ihres Materials und/oder der Wanddicke eine hohe Formfestigkeit aufweisen, welche auch größeren Unterdrücken standhält, besteht die Gefahr , daß die Ansaugfunktion bei unzureichender Belüftung beeinträchtigt wird.
Bei Behältern jedoch, die so dünnwandig sind und/oder aus flexiblem bzw. formelastischem Material bestehen, daß sie sich schon bei geringen Unterdrücken verformen, genügen die bisher bekannten Formen der ringförmigen Dichtungslippen zur Vermeidung von Behälterverformungen nicht. Dies gilt insbesondere dann, wenn die ringförmige Dichtungslippe, um eine radial kompakte Bauweise zu erzielen, nur eine relativ geringe radiale Ausdehnung haben soll, durch welche ihre Formelastizität bezüglich des öffnenden und schließenden Zusammenspiels mit der Innenfläche der sie umgebenden Ringwand ungenügend wird.
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, in the case of containers which 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 particularly true when the annular sealing lip, in order to achieve a radially compact design, should only have 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.

Außerdem besteht bei dünnwandigen bzw. leicht verformbaren Behältern aber auch die Gefahr, daß durch einen beabsichtigten oder unbeabsichtigten radialen Druck auf die Behälterwand ungewollt, wie beispielsweise bei einer Zahnpastatube, die ringförmige Dichtungslippe in Sperrichtung einem weit größeren Druck ausgesetzt wird als dies normalerweise der Fall ist, wenn der Behälter mit der aufgesetzten Dosierpumpe in Horizontallage gebracht oder auf den Kopf gestellt wird. Auch in diesem Fall sind die herkömmlichen Formen der ringförmigen Dichtungslippe nicht mehr geeignet ihre sperrende Wirkung zu erbringen und dem erhöhten Druck in Ausgaberichtung standzuhalten. Mit der Formgebung bzw. Querschnittsgestaltung allein ist das Wechselspiel zwischen Lufteinlaß bei relativ geringem Unterdruck und dichtem Absperren in entgegengesetzter Richtung unter erhöhtem Druck nicht mehr lösbar.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 subjected to a much greater pressure than is normally the case when the container with the dosing pump attached is placed horizontally or 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 inlet at a relatively low vacuum and tight shut-off in the opposite direction under increased pressure can no longer be solved.

Der Erfindung liegt deshalb die Aufgabe zu Grunde, eine Dosier- und Spraypumpe der eingangs genannten Art mit möglichst wenig einfachen, leicht montierbaren und zuverlässig arbeitenden Einzelteilen, an denen die Funktionselemente angeformt sein können, dahingehend zu verbessern, daß eine hohe Funktionssicherheit, insbesondere eine ausreichende, auch im trockenen Zustand überprüfbare Schließqualität bei geringer Öffnungskraft der Ausgabe- und Ansaugventile, gewährleistet ist.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.

Gelöst wird diese Aufgabe erfindungsgemäß dadurch daß die zylindrische Ventilringwand des Ausgabeventils und die mit einer geschlossenen Stirnwand versehene, ebenfalls zylindrische Ventilringwand des Ansaugventils mit ihren offenen, radial elastischen End- bzw. Randkanten jeweils umschließend an konischen oder kalottenartigen Mantelflächen eines Gehäuseteils anliegen und
- daß beide Ventilringwände in axialer Richtung federnd beweglich mit dem Faltenbalg verbunden sind, indem die Ventilringwand des Ausgabeventils über eine im wesentlichen radial nach außen vorspringende, vom Pumpdruck des Pumdmediums in Öffnungsrichtung beaufschlagbare, elastische Ringschulter einstückig mit dem ausgabeseitigen Ende des Faltenbalgs verbunden ist und indem die Ventilringwand des Ansaugventils durch einen sowohl axial- als auch radial-elastischen Verbindungsring und Verbindungsstege einstückig mit dem ansaugseitigen Ende des Faltenbalgs verbunden ist.
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 peripheral edges each abut 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 an essentially radially outwardly projecting pressure from the pumping medium in the opening direction actable, elastic ring shoulder is integrally connected to the discharge end of the bellows and in that the valve ring wall of the suction valve is integrally connected to the suction end of the bellows by an axially and radially elastic connecting ring and connecting webs.

Durch das gleichzeitige Vorhandensein einer radialen Elastizität und einer axialen Elastizität entsteht beim Schließvorgang aus einer zunächst linienförmigen Berührung zwischen der Ventilringwand und der von ihr umschlossenen konischen oder kalottenförmigen Mantelfläche eine flächenhafte Berührung, indem sich der Rand der Ventilringwand in axialer Richtung auf die Mantelfläche schiebt, so daß eventuell dazwischen liegende Partikel weggeschoben werden können. Auch kann sich dabei die Ventilringwand selbst bei Schräglage leicht und besser dichtend der Form der Mantelfläche anpassen.
Durch diese beiden in verschiedenen Richtungen wirksamen Elastizitäten der Ventilringwände wird erreicht, daß sich die Schließkräfte erhöhen, quasi verdoppeln, und die Öffnungskräfte vermindern, quasi halbieren. Auch bezüglich der erforderlichen Fertigungspräzision ist dadurch ein erheblich größerer Spielraum gewonnen.
Due to the simultaneous presence of radial elasticity and axial elasticity, an initially linear contact between the valve ring wall and the conical or dome-shaped lateral surface enclosed by it creates a surface 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.
These two elasticities of the valve ring walls, which are effective in different directions, result in the closing forces increasing, quasi doubling, and reducing the opening forces, quasi halving. As a result, a considerably greater scope is also gained with regard to the required manufacturing precision.

Außerdem wird die Öffnungskraft des Ausgabeventils zusätzlich vermindert, indem der im Medium herrschende Druck beim Ausgabehub zugleich in axialer Öffnungsrichtung auf die elastische Ringschulter einwirkt.
Während es auch ohne weiteres, allerdings mit einem erhöhten Montageaufwand, möglich wäre, die Ventilringwand des Ansaugventils als separates Bauteil zu fertigen und mittels entsprechender Verbindungsmittel mit dem Faltenbalg zu verbinden, bietet die Lösung nach Anspruch 2 den erheblichen Vorteil, die Ventilringwand und deren Verbindungselemente einstückig am Faltenbalg anzuspritzen. Außerdem ist durch die gewählten Verbindungselemente zugleich eine für die gewünschte Funktionsweise vorteilhafte hohe Elastizität und funktionelle Flexibilität gewährleistet.
In addition, the opening force of the dispensing valve is additionally reduced by the fact that the pressure prevailing in the medium during the dispensing stroke also 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.

Die Ausgestaltung nach Anspruch 3 verbessert die Wirkungsweise insofern, als die beim Ausgabehub auf den Faltenbalg einwirkende Schubkraft von der Ventilringwand ferngehalten wird.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.

Die Anordnung des Anspruchs 4 dient ebenfalls der vorteilhaften Weiterbildung der Erfindung, indem die Abdichtung der zum Ausagabemundstück führenden Ringkammer, die die Ventilringwand umgibt, auf die Funktion der Ventilringwand keinen nachteiligen Einfluß hat.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.

Die Ausgestaltungen der Ansprüche 5 und 6 begünstigen die funktionsgerechte Schließfunktion des Ansaugventils.The refinements of claims 5 and 6 favor the functional closing function of the intake valve.

Damit einerseits durch den während des Ansaughubes im Behälterinneren entstehenden Unterdruck auch bei dünnwandigen bzw. leicht verformbaren Behältern keine ungewollte Behälterverformung entsteht und damit andererseits bei der Ausübung von äußerem Druck auf die Behälterwand, so lange dieser die Zerstörungsgrenze nicht übersteigt, nichts vom Behälterinhalt nach außen dringen kann, ist die Ausgestaltung nach Anspruch 7 vorgesehen.So that, on the one hand, the negative pressure that arises inside the container during the suction stroke does not result in unwanted container deformation, even with thin-walled or easily deformable containers, and on the other hand, when external pressure is exerted on the container wall, as long as it does not exceed the destruction limit, nothing of the container contents can escape to the outside can, the embodiment according to claim 7 is provided.

Der besondere Vorteil, der dadurch erzielt wird, besteht darin, daß durch den Faltenbalg selbst während des Ausgabehubs die Ringrippe in Öffnungsrichtung verschoben wird und erst am Ende des Ansaughubs wieder in ihre Schließstellung zurückkehrt. Andererseits besteht aber zugleich die Möglichkeit, die Ringrippe so formstabil zu gestalten, daß sie in entgegengesetzter Richtung, d.h. in Sperrichtung einem erhöhten Druck standhält und kein Medium an ihr vorbei nach außen dringen läßt.The particular advantage that is achieved is that the bellows is displaced in the opening direction by the bellows even during the discharge stroke and only returns to its closed position at 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.

Durch die Ausgestaltung der Erfindung nach Anspruch 8 ist zudem sichergestellt, daß beim Auftreten eines von außen auf die Behälterwand einwirkenden Druckes oder beim Auftreten eines Fallstoßes auch nichts vom Behälterinhalt durch den Faltenbalg und das Ausgabeventil hindurch zum Ausgabemundstück gelangen kann.
Bei den bekannten Dosierpumpen der gattungsgemäßen Art ist auch diese Sicherheit nicht gegeben, weil das Schließorgan des ausgabeseitigen Auslaßventils in der Regel nur mit geringem Federdruck auf seiner Ventilsitzfläche ruht, so daß zu seinem Öffnen nur eine geringe in Ausgaberichtung wirkende Kraft genügt.
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.

Die Ansprüche 9 bis 15 betreffen vorteilhafte Ausgestaltungen der Erfindung, die, wie anhand des nachstehend näher beschriebenen Ausführungsbeispieles noch näher erläutert wird, insbesondere zur Erzielung eines kompakten, einfachen konstruktiven Aufbaues und zu einer einfachen, funktionssicheren Handhabung beitragen.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 construction and to simple, functionally reliable handling.

Zu beachten ist auch, daß durch die erfindungsgemäße Lösung keine zusätzlichen Kosten und auch kein zusätzlicher Raumbedarf entsteht, daß also eine preiswerte und zudem kompakter bauende Formgebung möglich ist.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.

In der Zeichnung zeigt:

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.

In der Zeichnung ist eine Dosier-und Spraypumpe, die zur Ausgabe flüssiger oder niederviskoser, insbesondere pastöser, Stoffe aus flaschen- oder dosenartigen Behältern dient, in ihrer üblichen Gebrauchslage bzw. Hanhabungslage dargestellt. Sie besteht aus einem ersten oberen ersten Gehäuseteil 1 und einem zweiten unteren Gehäuseteil 2, - wobei oben und unten in der Zeichnung auch der normalen Handhabungslage entsprechen, - sowie aus einem verbindend zwischen diesen beiden Gehäuseteilen 1 und 2 angeordneten Faltenbalg 3.
Während die beiden Gehäuseteile 1, 2 jeweils aus formstabilem Kunststoff hergestellt sind, besteht der Faltenbalg 3 aus einem gummiartig elastischem Kunststoff, dessen Elastizität aber eine ausreichende Formstabilität und andererseits eine ausreichend hohe Rückstellkraft für die Ausganghübe zu erbringen in der Lage ist.
Sowohl der Faltenbalg 3 als auch die beiden Gehäuseteile 1 und 2 sind jeweils im Spritzgußverfahren einstückig hergestellt.
Das Gehäuseteil 1 ist mit einem seitlich radial vorspringenden, rohrartigen Ausgabemundstück 4 versehen, dessen Ausgabekanal 5 in einer Ringkammer 6 mündet, die zwischen einer äußeren zylindrischen Führungswand 7 und einer inneren, sich nach unten konisch verjüngenden Ringwand 8 angeordnet und durch eine diese beiden verbindende Stirnwand 9 nach oben verschlossen ist. Auf dieser Stirnwand 9 ist mittels einer Rast- oder Schnappverbindung eine mit einem Schnappansatz 10 versehene Verschlußkappe 11 aufgesetzt, die das obere Ende der inneren Ringwand 8 verschließt.
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 arranged 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 is fitted with a snap or snap connection 10 provided with a snap cap 10 which closes the upper end of the inner ring wall 8.

Der Faltenbalg 3 ist am Ende seiner obersten Ringfalte 3/1 mit einem außen liegenden Dichtring 12 versehen, der unmittelbar oberhalb einer an der Führungswand 7 innen umlaufenden, dünnen Rippe 13 an der Innenfläche dieser Führungswand 7 dichtend anliegt. Oberhalb des äußeren Dichtrings 12 ist in einem geringen axialen Abstand davon eine radial nach außen vorspringende dünnwandige und deshalb axial-elastische Ringschulter 14 angeordnet, über welche eine im wesentlichen zylindrische und radial-elastische Ventilringwand 15 mit dem Faltenbalg 3 bzw. mit dem Dichtring 12 einstückig verbunden ist. Diese Ventilringwand 15 liegt mit ihrer oberen Endkante 16 mit einer gewissen sowohl axial als auch radial wirksamen Vorspannung dichtend an der konischen Mantelfläche 17 der inneren Ringwand 8 an und bildet einerseits im Zusammenwirken mit dieser inneren Ringwand 8 das bewegliche Schließorgan eines Ausgabeventils 18 bildet und andrerseits die Trennwand zwischen der Ringkammer 6 und dem Innenraum 19 des Faltenbalgs 3.The bellows 3 is provided at the end of its uppermost annular fold 3/1 with an outer sealing ring 12, which rests sealingly on the inner surface of this guide wall 7 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 integrally formed 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 sealingly 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 forms the Partition between the annular chamber 6 and the interior 19 of the bellows 3.

Der Innenraum 19 des Faltenbalgs 3 ist weitgehend ausgefüllt durch einen im Durchmesser mehrfach stufenweise abgesetzten, hohlzylindrischen Verdrängungskörper 16, der als Verlängerung einstückig an die innere Ringwand 8 des Gehäuseteils 1 angeformt ist und über seine gesamte Länge ringsum einen radialen Abstand von der Wandung des Faltenbalgs 3 aufweist, damit das auszugebende Medium zwischen dem Verdrängungskörper 20 und der Wandung des Faltenbalgs 3 hindurch strömen kann.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.

Lediglich im Bereich der obersten inneren Ringfalte 3/2 des Faltenbalgs 3 ist der Verdrängungskörper 20 mit mehreren an seinem Umfang verteilt angeordneten Stütznocken 21 versehen, die sich auf einer inneren Radialschulter 22 dieser Ringfalte 3/2 axial abstützen.
Diese Stütznocken 21 haben die Aufgabe den in Richtung des Pfeiles 67 wirksamen Pumpdruck beim Ausgabehub des Gehäuseteils 1 vom oberen Abschnitt des Faltenbalgs 3, insbesondere aber von der Ventilringwand 15 und der Ringschulter 14 fernzuhalten, damit deren Funktion nicht beinträchtigt wird.
An seinem unteren Ende weist der Verdrängungskörper 20 einen sich konisch erweiternden Randabschnitt 23 auf, der durch eine gegenüber der Randkante 24 axial nach oben versetzt angesetzte Stirnwand 25 verschlossen ist. Dieser Verdrängungskörper 20 ist, soweit er als Verlängerung der konischen Ringwand 8 in den Faltenbalg 3 ragt, mit einem kleineren Durchmesser versehen als die Ringwand 8.
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 is provided with a smaller diameter than the ring wall 8 insofar as it projects as an extension of the conical ring wall 8 into the bellows 3.

Die Führungswand 7 des Gehäuseteils 1 ist an ihrem unteren Ende mit einem nach innen vorspringenden Ringbund 26 versehen, der formschlüssig einen nach außen vorspringenden Ringbund 27 einer Führungswand 28 des Gehäuseteils 2 so untergreift, daß die beiden Führungswände 7 und 28 teleskopartig ineinander geführt sind und eine teleskopartige axiale Relativbewegung gegeneinander ermöglichen, die einem Pumphub entspricht. Begrenzt wird diese axiale Relativbewegung durch Axialanschläge, die in der einen Richtung von den beiden Ringbünden 26 und 27 gebildet werden und in der anderen Richtung von einer Ringschulter 29 des Gehäuses 2, auf welcher der Ringbund 26 des Gehäuseteils 1 am Ende des Pumphubes aufsitzt.
Der Ringbund 27 des Gehäuseteils 2 ist nach oben mit einem im Durchmesser gegenüber der Rippe 13 der Führungswand 7 verjüngten Kragen 30 versehen, durch welchen bei der Montage der Dichtring 12 von unter her über die Rippe 13 geschoben wird. Die Aufgabe der Rippe 13 ist es, den Dichtring 12 in der in der Zeichnung dargestellten Position zu halten.
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 of a guide wall 28 of the housing part 2 so that the two guide walls 7 and 28 are telescopically guided into one another and one 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 ring collars 26 and 27 and in the other direction by an annular shoulder 29 of the housing 2, on which the 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 tapering 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 hold the sealing ring 12 in the position shown in the drawing.

Die Durchmesser der Ringbünde 26, 27 und die Durchmesser der Führungswände 7, 28 sind so aufeinander abgestimmt, daß einerseits eine ausreichende Führung zwischen den beiden Gehäuseteilen 1 und 2 gewährleistet ist, daß aber andrerseits an den jeweiligen Berührungsstellen ein ausreichender Luftaustausch zwischen der Umgebung und dem gemeinsamen Gehäuse- Innenraum 31 bei den Hubbewegungen stattfinden kann.
Die Führungswand 28, die den Faltenbalg 3 mit geringem radialem Abstand umschließt, weist eine unterhalb der in Fig. 1 und 2 dargestellten Ruheposition und im axialen Bewegungsbereich der zweituntersten äußeren Ringfalte 3/3 des Faltenbalgs 3 liegende Durchmessererweiterung 33 auf, die im Zusammenspiel mit einer an dieser Ringfalte 3/3 angeordneten Ringrippe 34 ein zwangsbetätigtes Belüftungsventil zwischen dem gemeinsamen Innenraum 31 und einem im Bereich der Durchmessererweiterung 33 liegenden Stauraum 36.
The diameter of the ring collars 26, 27 and the diameter of the guide walls 7, 28 are so matched to one another 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 surroundings and the common housing interior 31 can take place during the lifting movements.
The guide wall 28, which surrounds 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.

Die Führungswand 28 ist auf einem Ringsteg 37 des Gehäuseteils 2 wie alle anderen Bestandteile, außer dem Ausgabemundstück 4, konzentrisch zur gemeinsamen Achse 32 einstückig angeformt. Auf dessen axialer Gegenseite ist eine mit einem Innengewinde 38 versehene Aufschraubkappe 39 angeformt, durch welche die gesamte Dosier-und Spraypumpe auf den nicht dargestellten Gewindehals eines dosen- oder flaschenartigen Pasten- oder Flüssigkeitsbehälters aufgeschraubt werden kann.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. A screw-on cap 39, which is provided with an internal thread 38, is formed on the opposite axial side thereof, 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.

An den Ringsteg 37 ist außerdem im Innern der Aufschraubkappe 39 konzentrisch ein zylindrischer Topfkörper 40 angeformt, dessen stirnseitige Bodenwand 41 einen zentralen, nippelartig nach oben gerichteten Höhlkörper 42 mit einer Ansaugbohrung 45 und mit einer kalottenförmigen, als Ventilsitz dienenden Mantelfläche 43 aufweist und der mit einem nach unten gerichteten Ansaugstutzen 44 versehen ist. Letzterer kann zum Ansaugen eines flüssigen Mediums mit einem nicht dargestellten Ausaugschlauch versehen werden. Behälter mit pastösen Stoffen sind in der Regel mit einem Nachlaufkolben versehen.
In diesem Topfkörper 40 sitzt spielfrei passend eine einstückig mit dem Faltenbalg 3 verbundene Zylinderwand 46, an deren oberem Ende ein radial nach innen vorspringender Ringbund 47 und die Ringfalten des Faltenbalgs einstückig angeformt sind.
In addition, a cylindrical pot body 40 is integrally formed on the ring web 37 inside 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 which has 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.

Die bereits erwähnte Ringrippe 34 hat die Aufgabe, während des Ansaughubs des Faltenbalges 3, also wenn der Faltenbalg 3 aus der in Fig. 2 dargestellten Pumphub-Endlage in Richtung des Pfeiles 48 in die in Fig. 1 dargestellte Ruhelage zurückkehrt, aus dem den Faltenbalg 3 umgebenden Innenraum 31, der durch die nicht luftdichte Verbindung zwischen den beiden Führungswänden 7 und 28 auch mit der Außenatmosphäre in Verbindung steht, Luft zu Belüftungsöffnungen 49 des Ringsteges 37 und durch diese in den Innenraum der Aufschraubkappe 39 bzw. in den Behälter gelangen zu lassen, auf welchen die Aufschraubkappe 39 aufgeschraubt ist. Diese Ringrippe 34 hat aber zudem auch die Aufgabe, zu verhindern, daß das sich im Behälter befindende Medium flüssiger oder pastöser Art, in den Innenraum 31 gelangen kann, wenn der Behälter statt der normalen Vertikallage eine Horizontallage einnimmt, also z.B. umfällt, oder wenn der Behälter mit einer verformbaren Wand versehen ist und auf diese von außen Druck ausgeübt wird. Sie hat also die Aufgabe, den Stauraum 36, der durch die Belüftungsöffnungen 49 mit dem Behälter ständig verbunden ist, dichtend vom Innenraum 31 zu trennen.The already mentioned ring rib 34 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 ring land 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 constantly connected to the container through the ventilation openings 49, from the interior 31.

Die Ringrippe 34 bildet somit im Zusammenwirken mit der Innenfläche der Führungswand 28 ein während der Hubbewegungen des ersten Gehäuseteils 1 offenes und in der Ruhestellung geschlossenes Belüftungsventil, das die Eigenschaft hat, in Sperrichtung einem relativ großen Druck standzuhalten und in Ansaugrichtung während des Ansaughubes des Faltenbalges Ansaugluft durchzulassen ohne daß im Behälterinnern ein Unterdruck entsteht, der ausreichen würde, dünne und leicht verformbare Behälterwände nach innen zu verformen.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.

Durch die vorstehend beschriebene Formgebung, die keine zusätzlichen Kosten verursacht, wird überdies eine radial sehr kompakte Bauweise erreicht.The shape described above, which causes no additional costs, also achieves a radially very compact design.

Die Zylinderwand 46 des Faltenbalgs 3 weist einen auf der Bodenwand 41 des Topfkörper 40 aufsitzenden verstärkten Stirnrand 50 aufweist, an dem eine erste Gruppe von drei axial nach oben gerichteten, in Umfangsrichtung jeweils um 120° zueinander versetzten, fingerartigen Verbindungsstegen 51 angeformt ist. Die oberen Enden dieser Verbindungsstege 51 sind einstückig mit einem sowohl radial als auch axial elastischen Verbindungsring 52 verbunden, der seinerseits durch eine zweite Gruppen von Verbindungsstegen 53, die im wesentlichen radial verlaufen und jeweils um 60° gegenüber den Verbindungsstegen 51 versetzt angebracht sind, mit einer zylindrischen Ventilringwand 54 verbunden und an ihrem oberen Ende mit einer ihren Hohlraum 56 abschließenden Stirnwand 57 versehen ist. Die Ventilringwand 54 ist dünnwandig ausgebildet, und sie sitzt mit ihrer unteren, offenen Randkante 55 radial-elastisch federnd und dichtend auf der kalottenförmigen Mantelfläche 43 des Hohlkörpers 42 auf.
Der Innendurchmesser der Ventilringwand 54 ist etwa doppelt so groß wie der Durchmesser der Ansaugbohrung 45 aber nur wenig kleiner als der Außendurchmesser des Hohlkörpers 42.
Auf Grund der sowohl radialen als auch axialen Elastizität des Verbindungsringes 52 kann sich die Ventilringwand 54 auch bei ungenauer Fertigung oder schiefer Lage immer dichtend an die Mantelfläche 43 anlegen, auch dann, wenn diese statt kalottenförmig konisch geformt wäre. Diese Elastizität oder Federeigenschaft des Verbindungsringes 52 stellt auch sicher, daß die Ventilringwand 54 nach einem beendeten Ansaughub wieder selbsttätig in ihre Schließstellung zurückkehrt. Die Mantelfläche 43 des Hohlkörpers 42 und die Ventilringwand 54 bilden somit das Ansaugventil 58 der Dosier-und Spraypumpe, während die Ventilringwand 15 im Zusammenwirken mit der inneren Ringwand 8 des oberen Gehäuseteiles 1 das Ausgabeventil 18 bildet.
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 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 and 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 completed suction stroke. 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 dispensing valve 18 in cooperation with the inner ring wall 8 of the upper housing part 1.

Während bei der vorstehend beschriebenen, bevorzugten Ausführungsform die Ventilringwand 54, die Verbindungsstege 51, 53 und der Verbindungsring 52 einstückig am unteren Stirnrand 50 des Faltenbalgs 3 angeformt sind, besteht auch die Möglichkeit, die äußeren Verbindungsstege 51 mit einem weiteren vorzugsweise stabileren Ring zu versehen, der in eine entsprechende Aufnahme des Stirnrandes 50 eingesetzt wird. Die Ventilringwand 54 könnte somit zusammen mit den Verbindungsstegen 51, 53, dem Verbindungsring 52 und dem zusätzlichen Ring als separates Bauteil hergestellt werden.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, it is also possible to provide 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.

Die Materialelastizität des Faltenbalgs 3 bewirkt auch eine selbsttätige Rückkehr des ersten Gehäuseteils 1 in seine ausgezogene Ruheposition, sobald keine Axialkraft mehr auf es ausgeübt wird, d.h., wenn es nach einem in Richtung des Pfeiles 67 erfolgten Ausgabehub losgelassen wird. Diese Rückbewegung in Richtung des Pfeiles 48 ist der Ansaughub, während dessen die Ventilringwand 54 axial federnd von der Mantelfläche 43 abgehoben wird, damit Medium aus dem Behälter in den Innenraum 60 der Zylinderwand 46 und der Ringfalten des Faltenbalgs 3 strömen kann.The material elasticity of the bellows 3 also brings about an automatic return of the first housing part 1 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.

Da sowohl das Ansaugventil 58 als auch das Ausgabeventil 18 bei Auftreten eines in Richtung des Pfeiles 48, d.h. in Ausgaberichtung wirksamen Druckes öffnen und dieser Druck auch dadurch entstehen kann, daß dünne verformbare Wände des Behälters, auf den die Dosier-und Spraypumpe aufgesetzt ist, zusammengepreßt werden, besteht bei solchen dünnwandigen bzw. mit verformbaren Wänden versehenen Behältern die Gefahr, daß durch den genannten Preßdruck, der die Behälterwände verformt, unkontrolliert Medium durch die Dosier-und Spraypumpe hindurch herausgepreßt wird. Dasselbe kann auch vorkommen, wenn ein mit einer solchen Dosier- und Spraypumpe versehener Behälter kopfüber fallend auf einer harten Unterlage auftrifft.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.

Um dieses ungewollte Auslaufen oder Auspressen von Medium zu verhindern, ist dem Ansaugventil 58 in Form des Ringbundes 47 und des konischen unteren Randabschnittes 23 des Verdrängungskörpers 20 ein Sperrventil 59 nachgeordnet, durch welches der Innenraum 60 der Zylinderwand 46 vom Innenraum 19 der Ringfalten des Faltenbalgs 3 dichtend abgetrennt ist, so lange sich der obere Gehäuseteil 1 in seiner oberen Endlage befindet, die in Fig. 1 und Fig. 2 dargestellt ist. In dieser Position bzw. Funktionslage liegt nämlich die konische Außenfläche des Randabschnitts 23 am Ringbund 23 dichtend an. Sobald jedoch der Pumphub, d.h. die Bewegung des oberen Gehäuseteils 1 in Richtung des Pfeiles 57 beginnt, wird dieser konische Randabschnitt 23 nach unten vom Ringbund 47 wegbewegt, so daß Medium zwischen dem Ringbund 47 und dem in diesem Bereich im Durchmesser kleineren Verdrängungskörper 20 hindurch in den Innenraum 19 des Faltenbalgs 3 strömen kann.
Der Verdrängungskörper 20 preßt bei seiner Abwärtsbewegung in Richtung des Pfeiles 57 somit das sich im Innenraum 60 befindende Medium zunächst in den Innenraum 19 des Faltenbalgs 3 und danach durch die Ventilringwand 15 des Ausgabeventils 18 hindurch in die Ringkammer 6 bzw. anschließend in den Ausgabekanal 5 des Ausgabemundstücks 4.
In order to prevent this unwanted 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 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.

Weil die Ventilringwand 15 am Außenrand der ebenfalls dünwandigen und deshalb in axialer Richtung elastischen Ringschulter 14 angeformt ist, ist sie auch in der Lage, axiale Bewegungen relativ zur Mantelfläche 17 der Ringwand 8 auszuführen, sodaß die Öffnungs- und Schließvorgänge leichter und schneller erfolgen können. Wichtig dabei ist aber auch, daß sich der beim Ausgabehub im Medium aufbauende Druck in Öffnungsrichtung auf die radiale Ringschulter 14 auswirkt und somit ein schnelleres Öffnen des Ausgabeventils 18 stattfindet.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 perform 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 that 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.

Der Verdrängungskörper 20 hat somit nicht nur die Aufgabe, den Innenraum 19 des Faltenbalgs 3 im Bereich der Ringfalten möglichst kleinvolumig zu halten, sondern er dient auch als Sperrventil, wenn er seine obere Endlage eingenommen hat.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.

Eine weitere Funktion, die der Verdrängungskörper 20 übernimmt, besteht darin, daß der konische Randabschnitt 23, so weit er sich unterhalb des Ringbundes 47 erstreckt, im Zusammenwirken mit der Zylinderwand 46 eine zusätzliche Führung des oberen Gehäuseteiles 1 im unteren Gehäuseteil 2 übernimmt. Zu diesem Zweck ist der sich unterhalb des Ringbundes 47 erstreckende Teil des Randabschnitts 23 auf einen Durchmesser erweitert, der zumindest annähernd dem Innendurchmesser der Zylinderwand 46 entspricht. Damit trotzdem das aus dem Innenraum 60 in den Innenraum 19 zu befördernde Medium relativ ungehindert der Zylinderwand 46 entlang nach oben strömen kann, ist der sich in Ruhelage unterhalb des Ringbundes 47 erstreckende Teil des Randabschnitts 23 auf seinem Umfang mit mehreren schlitzförmigen Ausnehmungen 62 versehen, die aber auf einem Durchmesser enden, der kleiner ist als der Innendurchmesser des Ringbundes 47, damit die Sperrventilwirkung erhalten bleibt.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 an 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 periphery 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.

Auf Grund der Tatsache, daß dieser führende Randabschnitt 23 von dem ebenfalls führenden Ringbund 26 der Führungswand 7 axial um Hublänge versetzt ist, sind die beiden Gehäuseteile 1, 2 auch in der Ruhelage (Fig. 1) so gut ineinander geführt, daß keine Behinderungen für die axiale Hubbewegung auftreten können, ohne daß zusätzliche, sich in axialer Richtung über eine längere Strecke überlappende Führungsflächen an den beiden Gehäuseteilen 1 und 2 erforderlich sind.Due to the fact that this leading edge section 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 additional guide surfaces on the two housing parts 1 and 2 overlapping in the axial direction over a longer distance being required.

Mit der erfindungsgemäßen Gestaltung ist eine Dosier-und Spraypumpe für flüssige und niederviskose bzw. pastöse Stoffe geschaffen, welche bei relativ weiten Fertigungstoleranzen eine störungsfreie Pumpfunktion gewährleistet und auch bei dünnwandigen, leicht verformbaren flaschen- bzw. dosenartigen Behältern vorteilhaft anwendbar ist und die sicherstellt, daß bei funktionsgerechter Handhabung keine Verformung der Behälterwände erfolgt und daß ein unkontrolliertes Herauspressen oder Ausfließen von Medium aus dem Behälter durch die Dosier-und Spraypumpe hindurch durch unsachgemäße Ausübung eines Preßdruckes auf eine flexible Behälterwand verhindert wird. Durch die verbesserte Pumpfunktion, die auf die besondere Ausgestaltung der beiden Pumpventile 48 und 54 zurückzuführen ist, wird die erfindungsgemäße Dosier- und Spraypumpe auch universell sowohl für flüssige als auch für pastöse Medien einsetzbar. Das anfängliche Ansaugen von Medium aus eine Behälter erfolgt sicher nach nur wenigen Pumphüben, und es ist eine trocken Funktionskontrolle der gesamten Pumpe möglich.With the design according to the invention, a metering and spray pump for liquid and low-viscosity or pasty substances is created, which guarantees 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 the container walls are not deformed when handled correctly and that uncontrolled pressing out 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 is due 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.

Es ist auch ohne weiteres möglich, die erfindungsgemäße Ausbildung der Ventile 18, 58 bei einer Dosier- und Spraypumpe einzusetzen, bei welcher der Behälter des Mediums anstatt eine Gewindekappe 39 aufzuweisen, unmittelbar am Gehäuseteil 2 angeformt ist.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)

  1. Dosing and spray pump for the delivery of liquid, low-viscosity and paste-like substances from bottle- or can-like containers, with a bellows (3) made of flexible plastic, which is arranged between two housing portions (1, 2) made of dimensionally stable plastic movable in relation to one another in the manner of a telescope, and connects said two housing portions (1, 2), and which is provided at one end with a sleeve-like valve ring wall (15) as delivery valve (18), said valve ring wall (15) being removable and arranged to surround the shell surface (17) of a circular ring wall (8) formed on the first housing portion (1) executing the pump strokes to form a seal, and said bellows (3) is also provided at its other end with a sleeve-like valve ring wall (54) as suction valve (58), said valve ring wall (54) being removable and arranged to abut the shell surface (43) of a circular valve seat (42) formed on the second housing portion (2) to form a seal, the pumping medium being sucked out of the container through said valve seat (42) and into the bellows (3), characterised in that the cylindrical valve ring wall (15) of the delivery valve (18) and the similarly cylindrical valve ring wall (54) of the suction valve (58) provided with a closed face wall (57) each abut conical or calotte-like shell surfaces (17, 43) of a housing portion (8; 42) at their open, radially flexible end or boundary edges (16; 55); and that both valve ring walls (15, 54) are connected in axial direction to the bellows (3) to be elastically movable, the valve ring wall (15) of the delivery valve (18) being integrally connected via an essentially radially outwardly projecting flexible ring shoulder (14) to the delivery end of the bellows (17), and the valve ring wall (5) of the suction valve (58) being integrally connected by a both axially and radially flexible connecting ring (52) and connecting webs (51, 53) to the suction end of the bellows (17).
  2. Dosing and spray pump according to Claim 1, characterised in that the connecting ring (52) is connected to the suction end section of the bellows (3) via a first group of at least three finger-like connecting webs (51) distributed in peripheral direction, and to the valve ring wall (5) of the suction valve (58) via a second group of at least three connecting webs (53) staggered in peripheral direction in relation to the connecting webs (53) of the first group.
  3. Dosing and spray pump according to Claim 2, characterised in that support cams (21), which abut the inner side of the bellows (3) in axial direction of the delivery stroke to axially move it with them, are provided on an extension projecting into the bellows (3) of the inner ring wall (8) surrounded by the valve ring wall (15) of the housing portion (1) executing the pump strokes.
  4. Dosing and spray pump according to one of Claims 1 to 3, characterised in that a sealing ring (12), which is pushed from the open side behind a circumferential rib (13) of a cylindrical guide wall (7) of the first housing portion (1) and abuts around the inner side of this guide wall to form a seal, is arranged in axial direction on the periphery of the bellows (3) between the valve ring wall (15) of the delivery valve (18) and the support cams (21).
  5. Dosing and spray pump according to Claim 1, characterised in that the valve seat of the second housing portion (2) on the suction side is provided in the form of a nipple-like hollow body (42), which projects into the suction end section (50) of the bellows (3) and is provided with a central suction hole (45).
  6. Dosing and spray pump according to Claim 5, characterised in that the diameter of the suction hole (45) corresponds to approximately half the diameter of the valve ring wall (54) surrounding it.
  7. Dosing and spray pump according to one of Claims 1 to 6, characterised in that on the periphery of an outer ring fold (3/3) of the bellows (3) surrounded by a cylindrical guide wall (28) of the second housing portion (2) a circumferential ring rib (34) is formed which, when the bellows (3) is in resting position, abuts the inner surface of the guide wall (28), and which is moved during the delivery stroke of the bellows (3) into an expanded area (33) of the guide wall (28) to be released axially.
  8. Dosing and spray pump according to one of Claims 1 to 7, characterised in that downstream of the suction valve (54), the bellows (3) is provided on its suction end with a non-return valve (59) locking in delivery direction, the immovable ring collar (47) of which is integrally formed on the bellows and the movable closing member (23) of which connects to the first housing portion (1) in such a way that it opens on every pump stroke.
  9. Dosing and spray pump according to Claim 8, characterised in that the bellows (3) is provided with a cylinder wall (46) in the form of a lower extension, which has a ring collar (47) forming part of the non-return valve (56), against which a conically outwardly projecting edge section (23) of a connecting body (20), which projects concentrically through the bellows (3), is structured as a closing member of the non-return valve (59) at its lower end and is connected to the first housing portion, abuts in the manner of a valve to form a seal in the resting position.
  10. Dosing and spray pump according to Claim 8, characterised in that the cylinder wall (46) extends axially at least over the length of a pump stroke and is arranged to abut in a cylindrical pot body (40) of the second housing portion (2), which is or may be connected to the container.
  11. Dosing and spray pump according to Claim 10, characterised in that the edge section (23) of the connecting body (20) connected to the first housing portion (1) is disposed with little radial play in the cylinder wall (46).
  12. Dosing and spray pump according to Claim 10, characterised in that the pot body (40) is arranged inside a screw-on cap (39) provided with an internal thread (38).
  13. Dosing and spray pump according to one of Claims 8 to 12, characterised in that the extension body (20) is provided in the form of a displacement piston, which projects through the bellows (3) with radial play.
  14. Dosing and spray pump according to one of Claims 8 to 13, characterised in that the two housing portions (1, 2) each have guide walls (7, 28) guided into one another in the manner of a telescope, said guide walls (7, 28) having a length corresponding to the length of the pump stroke and each having ring collars (26, 27) on their facing ends which engage underneath one another.
  15. Dosing and spray pump according to Claim 14, characterised in that the extension body (20) of the first housing portion (1) is longer than the guide wall (7) of this housing portion (1) by approximately the length of the pump stroke.
EP91121564A 1990-12-21 1991-12-17 Dosing and spraying pump for dispensing liquid, low viscous and paste-like material Expired - Lifetime EP0492354B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4041136A DE4041136C2 (en) 1990-12-21 1990-12-21 Dosing and spray pump for dispensing liquid, low-viscosity and pasty substances
DE4041136 1990-12-21

Publications (2)

Publication Number Publication Date
EP0492354A1 EP0492354A1 (en) 1992-07-01
EP0492354B1 true EP0492354B1 (en) 1994-09-14

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EP91121564A Expired - Lifetime EP0492354B1 (en) 1990-12-21 1991-12-17 Dosing and spraying pump for dispensing liquid, low viscous and paste-like material

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US (1) US5238156A (en)
EP (1) EP0492354B1 (en)
JP (1) JP3188497B2 (en)
KR (1) KR920012744A (en)
CN (1) CN1064732A (en)
BR (1) BR9105494A (en)
CA (1) CA2058374A1 (en)
CS (1) CS396091A3 (en)
DE (1) DE4041136C2 (en)
ES (1) ES2059024T3 (en)
FI (1) FI916025A (en)
HU (1) HUT61829A (en)
MX (1) MX9102658A (en)
NO (1) NO914623L (en)
PL (1) PL292816A1 (en)
ZA (1) ZA919877B (en)

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Also Published As

Publication number Publication date
JP3188497B2 (en) 2001-07-16
HU913798D0 (en) 1992-02-28
JPH04269386A (en) 1992-09-25
CA2058374A1 (en) 1992-06-22
MX9102658A (en) 1992-06-01
DE4041136A1 (en) 1992-07-02
NO914623D0 (en) 1991-11-26
FI916025A (en) 1992-06-22
ES2059024T3 (en) 1994-11-01
BR9105494A (en) 1992-09-01
HUT61829A (en) 1993-03-01
CS396091A3 (en) 1992-08-12
PL292816A1 (en) 1992-07-13
ZA919877B (en) 1992-09-30
NO914623L (en) 1992-06-22
KR920012744A (en) 1992-07-27
DE4041136C2 (en) 1994-06-30
FI916025A0 (en) 1991-12-19
US5238156A (en) 1993-08-24
EP0492354A1 (en) 1992-07-01
CN1064732A (en) 1992-09-23

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