EP1462181A1 - Dosing dispenser with bellows pump and follower plunger - Google Patents

Abstract

The dosing pump includes a spring-elastic bellows (29) acting as a pumping component and into which protrudes a displacement piston (40). The upper section of the pump's housing has a delivery opening which via an outlet passage and outlet valve (55) is connected to the pump chamber. The displacement piston is closed on its lower end, and in the upper end section of the pump chamber is provided with at least one through-hole which connects the pump chamber with the outlet valve.

Description

The invention relates to a dosing pump made of plastic for the dosed delivery of liquid and / or pasty Media from a bottle, can or tube-like container with trailing pistons, one promoting the medium Pump chamber connected to the container via a suction valve and as a pump organ forming a pump chamber, has resilient bellows between a dimensionally stable, lower housing part and one telescopically movable, also dimensionally stable upper Housing part is arranged, and wherein the upper housing part has the outlet opening, which via an outlet channel and an outlet valve connected to the pump chamber is, and wherein the bellows with an upper Ring collar sealing an annular wall of the upper housing part encloses that with a smaller in diameter, in provide the displacement piston protruding into the bellows is.

Metering pumps of the generic type are known. she are both for the metered output of a single medium as well as for the simultaneous dosed delivery of two different media used, with the output Medium in a connected to the dosing pump or connectable container is housed. There is Dispensers, so-called dispensers, with two separate ones Storage tanks and two dosing pumps that work together can be operated via an operating lever or the like (DE 101 10 888 A1) and those in which two different Media housed in a single storage container are (DE 200 19 540 U1) and by two separate Dosing pumps in different dosing quantities are conveyed to a common outlet opening.

In the case of generic metering pumps, the bellows plays functionally the most important role as a pump organ. This too Bellows must be made of plastic as an injection molded part and be able to adjust the restoring force for that after each working stroke, reset to the required Starting position to bring out of the reservoir to suck the amount of medium into the pumping chamber, which was issued during the working stroke. Therefore must the bellows both in terms of its diameter as well as in terms of its axial length and number a certain minimum size of elastic bellows folds exhibit.

However, this also results in a corresponding minimum size the interior of the bellows of the pumping chamber forms a multiple in some applications corresponds to the metered quantity to be dispensed with each pump stroke. This is due to the minimum size of the bellows To reduce the conditional volume of the pump chamber is at these known metering pumps already have a displacement piston provided that in the upper part of the pumping chamber or the bellows protrudes.

By reducing the volume of the pump chamber will also improve the suction process reached during the first pumping strokes in which the bellows is initially filled with air.

In these known metering pumps, the displacement piston has however, a central one on its lower end Opening through which the medium to be pumped to the outlet valve or pumped through this to the dispensing opening becomes. That is why it is with these known metering pumps unavoidable that in the upper area of the bellows a remaining one around the displacement piston Air cushion forms. This compressible air cushion can have the consequence that the dosing amounts of the individual Pump strokes are different.

The phenomenon of different dosing quantities falls Users of a single metering pump that only one only medium promotes, not on.

For dispensers with two arranged parallel to each other Dosing pumps and storage containers, each of which is separate different dosage amounts occur with a completely identical structure and also In this respect, uniformly acting metering pumps are perceptible in appearance than with transparent or translucent Container walls the axial positions of the two Trailing pistons differ after several pump strokes are. This disadvantage can also be recognized from the fact that one of the reservoirs was pumped empty earlier is than the other.

The invention has for its object a plastic parts existing, automatically mountable dosing pump of the type mentioned at the beginning with which Output quantities of the medium to be pumped can be precisely metered are.

This object is achieved in that the displacement piston is closed at its lower end is and in the upper end region of the pump chamber with at least a passage opening is provided which Pump chamber connects to the outlet valve.

The inventive design of the displacement piston it is ensured that in the upper, i.e. output side End area of the bellows or the displacement piston can no longer form an air cushion and itself the entire cavity of the bellows, i.e. the entire Pump chamber, with the intrinsically incompressible medium that can have a pasty or liquid consistency becomes. As a consequence, the same result large pumping strokes also the same large dosing quantities every pump stroke to the discharge opening and at the Return movement of the bellows out of the storage container be sucked in.

Advantageous embodiments of the invention are the subject of subclaims 2 to 8. With these configurations should in particular manufacturing technology as well assembly-related advantages can be achieved.

Fig. 1

einen Co-Dispenser im Schnitt;

Fig. 2

einen Schnitt II-II aus Fig. 1;

Fig. 3

einen Schnitt III-III aus Fig. 1;

Fig. 4

in vergrößertem Maßstab den Kopfteil des CoDispensers in der Ruhestellung der beiden Dosierpumpen;

Fig. 5

den Pumpenkopf des Co-Dispensers in vergrößerter Darstellung mit unterschiedlichen Funktionsstellungen der beiden Dosierpumpen;

Fig. 6

das Ventilküken des Auslaßventils in Draufsicht;

Fig. 7

einen Schnitt VII-VII aus Fig. 6;

Fig. 8

die Einzelteile des in den Fig. 4 und 5 dargestellten Pumpenkopfes in geschnittener Explosionsdarstellung;

Fig. 9

den Sockelkörper des Pumpenkopfes in Schnittdarstellung nach der Schnittlinie IX-IX aus Fig. 10;

Fig. 10

die Unteransicht X des Sockelkörpers aus Fig. 9;

Fig. 11

eine Draufsicht XI des Sockelkörpers aus Fig. 9;

Fig. 12

den Ventilsitzkörper der Auslaßventile in Draufsicht;

Fig. 13

einen Schnitt XIII-XIII aus Fig. 12;

Fig. 14

eine Unteransicht XIV aus Fig. 13;

Fig. 15

einen Teilschnitt XV aus Fig. 13 in vergrößerter Darstellung;

Fig. 16

einen Verdrängerkörper in Seitenansicht;

Fig. 17

einen Schnitt XVII-XVII aus Fig. 16;

Fig. 17a

einen Schnitt XVIIa-XVIIa aus Fig. 17

Fig. 18

eine Stirnansicht XVIII aus Fig. 17;

Fig. 19

den oberseitigen Haubenkörper des Pumpenkopfes in Draufsicht;

Fig. 20

einen Schnitt XX-XX aus Fig. 19;

Fig. 21

die Unteransicht XXI aus Fig. 20;

The invention is explained in more detail below on the basis of a so-called co-dispenser shown in the drawing and provided with two metering pumps and storage containers. It shows:

Fig. 1

an average co-dispenser;

Fig. 2

a section II-II of Fig. 1;

Fig. 3

a section III-III of Fig. 1;

Fig. 4

on an enlarged scale the head part of the CoDispenser in the rest position of the two dosing pumps;

Fig. 5

the pump head of the co-dispenser in an enlarged view with different functional positions of the two metering pumps;

Fig. 6

the valve plug of the exhaust valve in plan view;

Fig. 7

a section VII-VII of Fig. 6;

Fig. 8

the individual parts of the pump head shown in Figures 4 and 5 in a sectional exploded view.

Fig. 9

the base body of the pump head in a sectional view along the section line IX-IX of Fig. 10;

Fig. 10

the bottom view X of the base body of Fig. 9;

Fig. 11

a plan view XI of the base body of FIG. 9;

Fig. 12

the valve seat body of the exhaust valves in plan view;

Fig. 13

a section XIII-XIII of Fig. 12;

Fig. 14

a bottom view XIV of Fig. 13;

Fig. 15

a partial section XV of Figure 13 in an enlarged view.

Fig. 16

a displacer in side view;

Fig. 17

a section XVII-XVII of Fig. 16;

Fig. 17a

a section XVIIa-XVIIa of Fig. 17th

Fig. 18

an end view XVIII of Fig. 17;

Fig. 19

the top hood body of the pump head in plan view;

Fig. 20

a section XX-XX of Fig. 19;

Fig. 21

the bottom view XXI of Fig. 20;

The co-dispenser shown overall in FIGS. 1 and 2 has two separate, cylindrical in cross section Storage containers 1 and 2, which are parallel next to each other arranged and through two connecting walls 3 and 4 into one overall cross-sectionally elliptical container housing 5 are connected.

Both storage containers 1 and 2 are each with one Provide trailing pistons 6 and 7, the trailing piston 6 in its lowest and the trailing piston 7 in its uppermost end position is shown. During the Use phase should these two trailing pistons 6 and 7, however, the same axial position within the two Take storage containers 1 and 2.

As a bottom cover for the two storage containers open at the bottom 1 and 2 is a common, latching fastened Bottom cover 8 provided, the two ventilation openings 9 and 10.

The upper end of the container housing 5 is locked with a Base body 12 connected to a pump head 13, the two parallel and one each Reservoir 1 or 2 associated metering pumps 14 and 15 has. These two metering pumps 14 and 15 are each identically constructed and together by an upper one Hood body 18 can be actuated. Both metering pumps 14, 15 each consist of a bellows 29 as a pump organ, an outlet valve 38 and an outlet valve 55. Die Metering pumps 14, 15 are symmetrical about the vertical central axis 21 of the container housing 5 arranged in the pump head 13.

The hood body 18 forms the common dimensionally stable upper housing part of both metering pumps 14 and 15 and with an enlarged section 16 of an oval, axially parallel peripheral wall 17 in an also oval Annular wall 19 of the base body 12 guided axially movable.

This forms an inwardly projecting annular bead 20 the upper stroke limitation for the hood body 18.

The base body shown as an individual part in FIGS. 9 to 11 12 forms the dimensionally stable lower housing part of the two metering pumps 14 and 15. At the lower end of it Ring wall 19 is located transversely to the central axis 21 trending bottom wall 22 with two symmetrical to this central axis 21 arranged suction openings 23rd is provided. These suction openings 23 extend in each case through valve seat sockets rounded on the outside on the outside 24, which in turn is concentric by a hollow hub 25 are surrounded.

Located in the center of the bottom wall 22 of the base body 12 there is a guide tube concentric with the central axis 21 26, which projects beyond the annular wall 19.

To accommodate the lower end 28 of a bellows 29 (Fig. 8) is the bottom wall 22 on the top with two cylindrical, ring connector concentric to the outlet openings 27 provided. The lower end 28 of the bellows 29 is integrally formed by elastic Finger 30 held valve cap 31 fitted on the valve seat socket 24 sits sealingly and with this together forms the intake valve 38.

The upper end of the bellows 29 is round Ring collar 35 provided sealing an annular wall 36 a Displacer piston 40 encloses.

The one shown in Figs. 16 to 18 as a single part Displacement piston 40 is an integral part of a formed as a separate item hollow body, the also contains the annular wall 36. Here is the displacement piston 40 on an underside radial wall ring 41 of the Ring wall 36 formed. This radial wall ring 41 faces inside the annular wall 36 has an annular collar 47, which approximately has the same outer diameter as that substantially hollow cylindrical displacement piston 40. The displacement piston 40 has an open top and bottom cavity closed by an end wall 44 43rd

Immediately below the radial wall ring 41 is the Displacement piston 40 with four radial, for example Passage openings 45 provided which the from the interior of the bellows 29 formed pump chamber 32 with an outlet valve 55 connect.

These passage openings 45 are formed by four axial grooves 46, each offset by 90 ° to one another, which are arranged on the outside on the displacer piston 40 and whose radial depth t ends within the inner diameter d of the annular collar 47. This ring collar 47 is arranged above the passage openings 45. It serves for sealingly receiving a valve stub 56, which is open at the bottom, of the outlet valve 55 (FIGS. 4 and 5). This valve socket 56 is an integral part of a valve seat housing 60, which is inserted into the hood body 18 in a form-locking manner.

In order to avoid that the entire cavity 43 of the Fills displacement piston 40 with the medium to be dispensed, the valve socket 56 is provided with a plug 57, which is integrally connected to it by rib-like webs 58 is and sealing in the cavity 43 of the displacer 40 protrudes from above. The rib-like webs 58 are at the level of the passage openings 45 of the displacer 40 arranged so that the medium to be dispensed from the pump chamber 32 of the bellows 29 into the interior of the valve stub 56 can reach.

The valve seat housing 60 is shown in FIGS. 12, 13 and 14 or 15 shown as a single part. It owns one of the oval cross-sectional shape of the hood body 18 adapted oval ring wall 61, within which symmetrical to axial central axis 21 with the two valve sockets 56 the plug 57 are arranged. On a closed one End wall 62 is a downward guide tube 63 integrally formed, which is the guide tube 26 of the base body 12 can accommodate telescopically and as an additional Centering element movable between the two guided pump bodies is used.

As best seen in FIGS. 13 and 14 the two valve sockets 56 are ring-shaped from a large number surrounded by axially extending centering ribs 64 which for Part on the inside of the ring wall 61 and in part integrally formed on the inside of two cylinder walls 65 are. These centering ribs 64 are used on the one hand for snapping shot of the one at the top with an outward projecting bead ring 48 provided ring wall 36 of the displacement piston 40. On the other hand, they serve to the upper collar 35 of the bellows 29 sealing to the Press annular wall 36 of the displacer 40.

At the upper ends of the valve stub 56 are located in each case dome-shaped valve seat rings 67 the valve guide walls 68, which are cylindrical on the upper side connect.

In the valve socket 56, the valve seat ring 67 and the valve seat wall 68 enclosed cavity is a valve plug 75 axially movable, which is the movable Forms part of the exhaust valve or valves 55. This Valve plug 75 is enlarged in FIGS. 6 and 7 Scale as a single part in front view from underneath and shown in section. It has a round locking plate 76, which in their rest position, i.e. also during the Output strokes resilient and sealing on the dome-shaped Inner surface of the valve seat ring 67 rests. At the There are three undersides of this locking plate 76 star-shaped guide ribs 77 in the valve stub 56 are performed. The striking plate is on the top 76 provided with a thin ring wall 78 which obliquely radial, axially resilient webs 79 with an im Diameter larger support ring 80 is connected. This Support ring 80 is supported on the top on wreath-like arranged Support ribs 81, which are concentric with the central axis 70 of the valve stub 56 or the valve seat ring 67 and the valve seat wall 68 on the inside of the horizontal Top wall 89 of the hood body 18 within a Channel ring 82 are arranged.

These two channel rings 82 are also, as shown in FIG. 19 to 22 can be seen, symmetrical to the central axes 21 and 21 'arranged and integral part of the hood body 18. Two channels lead from these channel rings 82 83 to a centrally arranged mouthpiece 84, the both dispensing openings 85 through a central wall 86 from one another are separated.

These channels 83 are formed by vertical wall elements 87 and 88, which are also in one piece on the inside the top wall 89 are formed and the common with the channel rings 82 sealing on the top of the Face the end wall 62 of the valve seat housing.

The known mode of operation of such metering pumps guaranteed by the redesign according to the invention of the displacer 40 that within the Cavity of the bellows 29 formed pump chamber 32 no Residual air cushions can form more because of the passage openings 45, through which the medium from the pump chamber 32 in the outlet valve 55 arrives in the upper end region of the Bellows 29 lie.

Initially, i.e. before the first pumping strokes, in Bellows 29 or air located in the pump chamber 32, comes with the filling process by sucking in the medium from the storage container 1 or 2, completely the pump chamber 32 via the outlet valve 55 from the metering pump fed out.

It can thus be ensured that the suction of the Medium from the two storage containers 1 and 2 at the two identically constructed metering pumps 55 evenly and that the dosing quantities of both dosing pumps are the same size for each pump stroke. As a consequence, that the two storage containers empty themselves evenly and the two trailing pistons 6 and 7 each same fill levels the same take axial position and that finally the two Storage containers are pumped empty at the same time.

Claims (8)

Dosing pump made of plastic for the dosed delivery of liquid and / or paste-like media from a bottle, can or tube-like container (1, 2) with a follower piston (6, 7), a pump chamber (32) conveying the medium via a suction valve (38 ) is connected to the container (1, 2) and has as pump element a spring-elastic bellows (29) forming the pump chamber (32), which is arranged between a dimensionally stable, lower housing part (12) and a telescopically movable, also dimensionally stable upper housing part and wherein the upper housing part has the outlet opening (85), which is connected via an outlet channel and an outlet valve (55) to the pumping chamber (32), and furthermore the bellows (29) with an upper annular collar (35) sealingly one Encloses the annular wall (36) of the upper housing part, which is provided with a displacement piston (40) with a smaller diameter and protruding into the bellows (29),
characterized in that the displacement piston (40) is closed at its lower end and is provided in the upper end region of the pump chamber (32) with at least one passage opening which connects the pump chamber (32) to the outlet valve (55). Dosing pump according to claim 1, characterized in that the displacement piston (40) has a cavity open on the upper side. Dosing pump according to claim 1 or 2, characterized in that the displacement piston (40) forms with the ring wall enclosed by the ring collar of the bellows a separate hollow body which is open at the top and which has an annular collar within its ring wall (36) above the passage opening (s) (45) (47) for sealingly receiving a valve neck (56) of the outlet valve (55) which is open at the bottom. Dosing pump according to claim 2, characterized in that the valve stub (56) has a stopper (57) connected to it by rib-like webs (58), said plug sealingly into the cavity (43) of the displacement piston (43) below the passage opening (s) (45). 40) protrudes. Dosing pump according to Claim 3, characterized in that the displacement piston (40) is formed concentrically on a radial wall ring (41) on the underside of the ring wall (36). Dosing pump according to claim 5, characterized in that the displacement piston (40) for forming the passage opening (s) (45) is provided on the outside with at least one axial groove (46), the radial depth (t) of which is radially within the inner diameter (d) of the ring collar (47) ends. Dosing pump according to one of claims 1 to 6, characterized in that the annular wall (36) provided with the displacement piston (40) is provided at its upper end with a bead ring (48) which is latched to centering ribs (64) which are ring-like arranged around the valve stub (56) and together with the valve stub (56) are an integral part of a valve seat housing (60). Dosing pump according to Claim 7, characterized in that the valve seat housing (60) is inserted in a form-locking manner in a hood body (18) and together with this forms the upper housing part.

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