EP0415259B1 - Dosing pump - Google Patents
Dosing pump Download PDFInfo
- Publication number
- EP0415259B1 EP0415259B1 EP90116104A EP90116104A EP0415259B1 EP 0415259 B1 EP0415259 B1 EP 0415259B1 EP 90116104 A EP90116104 A EP 90116104A EP 90116104 A EP90116104 A EP 90116104A EP 0415259 B1 EP0415259 B1 EP 0415259B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metering
- stroke
- space
- plunger
- sealing head
- 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
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/06—Venting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
Definitions
- the invention relates to a metering pump with a pump cylinder connected on the inlet side with a pre-delivery chamber and on the outlet side with a metering point and a metering piston interacting therewith and a membrane, the pre-delivery chamber can be above or to the side of the pump cylinder, and with a metering agent container via a suction line and a suction valve a return line having a pressure valve can be connected.
- the pre-delivery chamber is connected to a metering agent container via a suction line having a suction valve and a return line having a pressure valve.
- the pre-delivery takes place via the suction line and the suction valve to the pre-delivery room.
- the dosing piston takes the required amount of dosing agent from the pre-delivery chamber. The excess amount of the dosing agent is conveyed back into the dosing agent container via the pressure valve and the return line.
- the metering piston must emerge from the compression ring in the cylinder chamber so that the compression chamber is vented. When the dosing piston is immersed in the compression ring, it is mechanically worn out very quickly. This causes high replacement costs for a low-value part, such as a compression ring.
- the object of the invention is therefore to provide a metering pump for metering liquid media, in particular also aggressive and / or outgassing media, in which the metering piston no longer emerges from the compression ring and the pump acts self-priming and self-venting even against pressure.
- FIGS. 1 to 3 A first exemplary embodiment of the invention is explained with reference to FIGS. 1 to 3, while FIG. 4 represents another exemplary embodiment.
- FIG. 1 and 2 show the metering pump according to the invention during the metering and suction stroke
- FIG. 3 shows, on an enlarged scale, a specific position of the pump during the suction stroke.
- a metering pump 1 is provided with a housing 2, which has a compression space 3 and an overlying cylinder space 4.
- the compression chamber 3 is connected on the input side to a metering container 7 via a suction valve 5 and a suction line 6.
- the metering piston 8 is designed as a hollow piston and is guided by means of a piston guide 9, in which a compression ring 10 is located.
- the top of the hollow piston is designed as a sealing plate 11, wherein the sealing plate 11 can have a sealing bead 12 on its top.
- the cylinder space 4 is delimited at the top by a stop ring 13, through which the lifting plunger 21 can move freely, i.e. A gap 17 remains between the lifting plunger 21 and the inside diameter of the stop ring 13, through which the dosing agent can pass from the cylinder space 4 into the membrane space 16.
- the diaphragm space 16 is delimited at the top by the pre-delivery diaphragm 18 and is in contact with the cylinder space 4 as long as the sealing plate 11 does not abut the stop ring 13.
- the excess pre-conveyed medium is returned via a return valve 19 and a return line 33 into the dosing agent container 7 during the return stroke.
- the dosing medium When the dosing medium is sucked out of the dosing agent container 7, it is fed into the cylinder chamber 4 via the suction line 6 and the bypass line 15 and the check valve 20 and from there through the suction effect of the pre-delivery membrane 18 through the gap 17 between the inside diameter of the stop ring 13 and the outside diameter of the lifting tappet 21 promoted in the membrane space 16.
- the return valve 19 is closed during suction.
- the hollow piston 8 with the sealing plate 11 is pressed by a spring 24 against a seal 22 on the lifting plunger 21 until the sealing plate 11 bears against the stop ring 13 when the plunger 21 moves further.
- the lifting plunger 21 After completion of the suction stroke during the dosing stroke (see FIG. 1) the lifting plunger 21 is moved in the other direction via the eccentric 24 and the yoke 25 until the lifting plunger 21 lies sealingly on the sealing bead 12 of the sealing plate 11 and thus the through bore 23 of the Hollow piston 8 closes. During the further metering stroke, the peripheral edge 26 of the lifting plunger 21 takes over the power transmission to the hollow piston 8 and the spring 24. This ensures a constant pressure rigidity during the metering stroke. After reaching the sealing plate 11, the lifting plunger 21 presses the hollow piston 8 against the spring up to the lower maximum value set on the stroke adjustment 27.
- the suction valve 5 is pressed against the sealing seat 28 and closes the suction line 6.
- the dosing agent in the compression chamber 3 is thereby pressed into the dosing line 32 via the hose valve 31 via the transverse bore 30 in the cylinder 29.
- the dosing medium sucked in too much via the pre-delivery membrane 18 and any gas bubbles which may be present are simultaneously released via the return valve 19 and the dosing stroke Return line 33 is fed back into the metering container 7.
- the gas bubbles returned to the metering container 7 rise to the atmosphere after exiting the return line within the metering container and are not sucked in again.
- the medium is sucked directly into the hollow piston 8 via the suction line 6, the suction valve 5 and the through bore 23.
- the lifting plunger 21 lifts off the sealing lip 12 of the plate 11.
- the dosing medium is then conveyed through the hollow piston 8 via the gap 17 into the membrane space 16 via the pre-delivery membrane 18.
- the compression chamber is completely filled with dosing agent and vented.
- a bypass line 15 and a check valve 20 are not required.
- the embodiment is particularly suitable for small metering strokes.
Landscapes
- 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)
- Medicines Containing Plant Substances (AREA)
Abstract
Description
Die Erfindung betrifft eine Dosierpumpe mit einem eingangsseitig mit einem Vorförderraum und ausgangsseitig mit einer Dosierstelle verbundenen Pumpenzylinder und einem damit zusammenwirkenden Dosierkolben sowie einer Membran, wobei der Vorförderraum oberhalb oder seitlich des Pumpenzylinders liegen kann, und mit einem Dosiermittelbehälter über eine ein Saugventil aufweisende Saugleitung und eine ein Druckventil aufweisende Rücklaufleitung verbindbar ist.The invention relates to a metering pump with a pump cylinder connected on the inlet side with a pre-delivery chamber and on the outlet side with a metering point and a metering piston interacting therewith and a membrane, the pre-delivery chamber can be above or to the side of the pump cylinder, and with a metering agent container via a suction line and a suction valve a return line having a pressure valve can be connected.
Bei bekannten Dosierpumpen, wie sie beispielsweise aus der EP-A-0117969 oder der US-A-4278406 bekannt sind, ist der Vorförderraum über eine ein Saugventil aufweisende Saugleitung und eine ein Druckventil aufweisende Rückleitung mit einem Dosiermittelbehälter verbunden. Die Vorförderung erfolgt über die Saugleitung und das Saugventil zum Vorförderraum. Aus dem Vorförderraum entnimmt der Dosierkolben die erforderliche Menge Dosiermittel. Die überschüssige Menge des Dosiermittels wird über das Druckventil und die Rücklaufleitung in den Dosiermittelbehälter zurückbefördert.In known metering pumps, as are known for example from EP-A-0117969 or US-A-4278406, the pre-delivery chamber is connected to a metering agent container via a suction line having a suction valve and a return line having a pressure valve. The pre-delivery takes place via the suction line and the suction valve to the pre-delivery room. The dosing piston takes the required amount of dosing agent from the pre-delivery chamber. The excess amount of the dosing agent is conveyed back into the dosing agent container via the pressure valve and the return line.
Dabei muß der Dosierkolben aus dem Kompressionsring im Zylinderraum austauchen, damit eine Entlüftung des Kompressionsraums gegeben ist. Beim Eintauchen des Dosierkolbens in den Kompressionsring wird dieser sehr schnell mechanisch verschlissen. Dies verursacht hohe Austauschkosten für ein geringwertiges Teil, wie es ein Kompressionsring darstellt.The metering piston must emerge from the compression ring in the cylinder chamber so that the compression chamber is vented. When the dosing piston is immersed in the compression ring, it is mechanically worn out very quickly. This causes high replacement costs for a low-value part, such as a compression ring.
Aufgabe der Erfindung ist es deshalb, eine Dosierpumpe zum Dosieren flüssiger Medien, insbesondere auch agressiver und/oder ausgasender Medien zu schaffen, bei welcher der Dosierkolben nicht mehr aus dem Kompressionsring austaucht und die Pumpe selbstansaugend und selbstentlüftend auch gegen Druck wirkt.The object of the invention is therefore to provide a metering pump for metering liquid media, in particular also aggressive and / or outgassing media, in which the metering piston no longer emerges from the compression ring and the pump acts self-priming and self-venting even against pressure.
Außerdem soll ein Einbau der Dosierpumpe in senkrechter oder wagrechter Anordnung möglich sein.In addition, it should be possible to install the metering pump in a vertical or horizontal arrangement.
Diese Aufgabe wird durch die im Anspruch 1 gekennzeichneten Mittel gelöst. Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche.This object is achieved by the means characterized in
Ein erstes Ausführungsbeispiel der Erfindung wird anhand der Figuren 1 bis 3 erläutert, während die Figur 4 ein anderes Ausführungsbeispiel darstellt.A first exemplary embodiment of the invention is explained with reference to FIGS. 1 to 3, while FIG. 4 represents another exemplary embodiment.
Dabei zeigen die Figuren 1 und 2 die erfindungsgemäße Dosierpumpe während des Dosier- und Saughubs, während die Figur 3 im vergrößerten Maßstab eine bestimmte Position der Pumpe während des Saughubs wiedergibt.1 and 2 show the metering pump according to the invention during the metering and suction stroke, while FIG. 3 shows, on an enlarged scale, a specific position of the pump during the suction stroke.
In der Figur 1 ist eine Dosierpumpe 1 mit einem Gehäuse 2 dar gestellt, welche einen Kompressionsraum 3 und einen darüberliegenden Zylinderraum 4 aufweist. Der Kompressionsraum 3 ist eingangsseitig über ein Saugventil 5 und eine Saugleitung 6 mit einem Dosierbehälter 7 verbunden.In the figure 1, a
Der Dosierkolben 8 ist als Hohlkolben ausgebildet und wird mittels einer Kolbenführung 9, in welcher sich ein Kompressionsring 10 befindet, geführt. Die Oberseite des Hohlkolbens ist als Dichtteller 11 ausgebildet, wobei der Dichtteller 11 an seiner Oberseite einen Dichtwulst 12 aufweisen kann. Der Zylinderraum 4 wird oben durch einen Anschlagring 13 begrenzt, durch den sich der Hubstößel 21 frei bewegen kann, d.h. zwischen Hubstößel 21 und dem Innendurchmesser des Anschlagringes 13 verbleibt ein Spalt 17, durch den das Dosiermittel aus dem Zylinderraum 4 in den Membranraum 16 gelangen kann.The
Der Membranraum 16 ist nach oben durch die Vorfördermembrane 18 begrenzt und steht, solange der Dichtteller 11 nicht am Anschlagring 13 anliegt, mit dem Zylinderraum 4 in Verbindung. Das überschüssig vorgeförderte Medium wird über ein Rücklaufventil 19 und eine Rücklaufleitung 33 in den Dosiermittelbehälter 7 beim Rückhub zurückgeführt.The
Beim Ansaugen des Dosiermediums aus dem Dosiermittelbehälter 7 wird dieses über die Saugleitung 6 und die Umgehungsleitung 15 und das Rückschlagventil 20 in den Zylinderraum 4 und von dort durch die Saugwirkung der Vorfördermembrane 18 durch den Spalt 17 zwischen dem Innendurchmesser des Anschlagringes 13 und dem Außendurchmesser des Hubstößels 21 in den Membranraum 16 gefördert.When the dosing medium is sucked out of the
Beim Ansaugen ist das Rücklaufventil 19 geschlossen. Bei Beginn des Saughubs wird der Hohlkolben 8 mit dem Dichtteller 11 durch eine Feder 24 gegen eine Dichtung 22 am Hubstößel 21 gepreßt, bis der Dichtteller 11 bei weiterer Bewegung des Stößels 21 am Anschlagring 13 anliegt.The
Hat der Hohlkolben 8 beim Saughub, wie in den Figuren 2 und 3 dargestellt, den Anschlagring 13 erreicht, verschließt der Dichtteller 11 des Hohlkolbens über den Dichtring 14 das weitere Ansaugen von Dosiermittel durch den Spalt 17. Es kann somit kein Dosiermedium mehr über die Umgehungsleitung 15 und das Rückschlagventil 20 angesaugt werden. Beim weiteren Saughub des Hubstößels 21 wird die Durchgangsbohrung 23 des Hohlkolbens 8 geöffnet. Das Ansaugen erfolgt nun auf dem direkten Weg durch das Ansaugventil 5 und den Kompressionsraum 3 sowie die Durchgangsbohrung 23 des Hohlkolbens. Der Kompressionsraum 3 wird mit Dosiermedium gefüllt und gleichzeitig vollständig entlüftet, ohne daß der Hohlkolben 8 aus der Kolbenführung 9 bzw. dem Kompressionsring 10 austreten muß.Has the
Nach Beendigung des Saughubs wird beim Dosierhub (vgl. Fig. 1) der Hubstößel 21 über den Exzenter 24 und das Joch 25 in die andere Richtung bewegt, bis der Hubstößel 21 auf dem Dichtwulst 12 des Dichttellers 11 dichtend aufliegt und somit die Durchgangsbohrung 23 des Hohlkolbens 8 verschließt. Der umlaufende Rand 26 des Hubstößels 21 übernimmt beim weiteren Dosierhub die Kraftübertragung auf den Hohlkolben 8 und die Feder 24. Dadurch wird eine gleichbleibende Drucksteifigkeit beim Dosierhub gewährleistet. Der Hubstößel 21 drückt nach Erreichen des Dichttellers 11 den Hohlkolben 8 gegen die Feder weiter bis zu dem an der Hubverstellung 27 eingestellten unteren Maximalwert.After completion of the suction stroke during the dosing stroke (see FIG. 1) the
Während des Dosierhubs des Hubstößels 21 und des Hohlkolbens 8 wird das Saugventil 5 gegen den Dichtsitz 28 gepreßt und verschließt die Saugleitung 6. Das Dosiermittel im Kompressionsraum 3 wird dadurch über die im Zylinder 29 angebrachte Querbohrung 30 über das Schlauchventil 31 in die Dosierleitung 32 gedrückt.During the dosing stroke of the lifting plunger 21 and the
Das über die Vorfördermembrane 18 zuviel angesaugte Dosiermedium und die eventuell vorhandenen Gasblasen werden beim Dosierhub gleichzeitig über das Rücklaufventil 19 und die Rücklaufleitung 33 in den Dosierbehälter 7 zurückgeführt. Die in den Dosierbehälter 7 zurückgeführten Gasblasen steigen nach Austritt aus der Rücklaufleitung innerhalb des Dosierbehälters zur Atmosphäre auf und werden nicht wieder eingesaugt.The dosing medium sucked in too much via the
Ist der Dosierhub abgeschlossen, so folgt angetrieben über den Exzenter 24 ein neuer Saughub.When the dosing stroke is completed, a new suction stroke follows via the eccentric 24.
Bei dem in Fig. 4 dargestellten Ausführungsbeispiel wird das Medium direkt über die Saugleitung 6, das Saugventil 5 und die Durchgangsbohrung 23 im Hohlkolben 8 angesaugt. Beim weiteren Saughub hebt der Hubstößel 21 von der Dichtlippe 12 des Tellers 11 ab. Über die Vorfördermembrane 18 wird dann das Dosiermittel durch den Hohlkolben 8 über den Spalt 17 in den Membranraum 16 gefördert. Der Kompressionsraum wird vollständig mit Dosiermittel gefüllt und entlüftet. Bei dieser Ausführung ist keine Umgehungsleitung 15 und kein Rückschlagventil 20 erforderlich. Die Ausführungsform eignet sich besonders für kleine Dosierhübe.In the embodiment shown in FIG. 4, the medium is sucked directly into the
Die übrigen Teile entsprechen denen im Ausführungsbeispiel nach den Figuren 1 und 2.The remaining parts correspond to those in the exemplary embodiment according to FIGS. 1 and 2.
Claims (7)
- Metering pump having a predelivery space at the feeding side and a pumping cylinder at the delivery side, which is connected to a metering point, as well as a metering plunger cooperating therewith, a diaphragm, and an intake passage adapted to be connected to a metering means container, which passage includes an intake valve and a return line comprising a pressure valve,
characterized in that said metering plunger (8) is configured as a hollow plunger having an annular sealing head (11) on the side opposite to the metering line (32), which head is frictionally pressed against one and of the displacement tappet (21), that the cylinder space (4) is defined by a stop ring (13) on the side of said displacement tappet (21) for the unrestricted passage of said displacement tappet (21) therethrough so as to form a gap (17), that the delivery-side end of said cylinder space (4) is formed by a plunger guide (9) in which said hollow plunger (9) moves throughout the entire intake and metering stroke, and that the distance between the compression space (3) and said sealing head (11), as well as the position of said stop ring (13) in said cylinder space (4) and the magnitude of the stroke of said displacement tappet (21) are so dimensioned that in a second stage of the intake stroke said sealing head (11) sealingly bears against said stop ring (13) and that by the end of the intake stroke and in a first stage of the metering stroke the medium may flow out of the diaphragm space (16) through the through-passage (23) of said hollow plunger (8) into said compression space (3). - Metering pump according to Claim 1,
characterized in that said cylinder space (4) is connected to the metering means container (7) via a bypass line (15) including an intake valve (20). - Metering pump according to Claim 2,
characterized in that said plunger guide (9) comprises a compression ring (10). - Metering pump according to Claim 1,
characterized in that said sealing head (11) has a sealing bead (12) on its side bearing against said displacement tappet (21). - Metering pump according to Claim 1,
characterized in that said stop ring (13) comprises at least one sealing ring (14) on its side bearing against said sealing head (11). - Metering pump according to Claim 1,
characterized in that said displacement tappet (21) comprises a peripheral rim (26) on its side bearing against said sealing head (11). - Metering pump according to Claim 1,
characterized in that said frictional connection is established by a spring (24) supported on said plunger guide (9) and on said sealing head (11).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT90116104T ATE97195T1 (en) | 1989-08-28 | 1990-08-22 | DOSING PUMP. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3928411A DE3928411A1 (en) | 1989-08-28 | 1989-08-28 | DOSING PUMP |
DE3928411 | 1990-08-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0415259A1 EP0415259A1 (en) | 1991-03-06 |
EP0415259B1 true EP0415259B1 (en) | 1993-11-10 |
Family
ID=6388043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP90116104A Expired - Lifetime EP0415259B1 (en) | 1989-08-28 | 1990-08-22 | Dosing pump |
Country Status (5)
Country | Link |
---|---|
US (1) | US5017105A (en) |
EP (1) | EP0415259B1 (en) |
JP (1) | JPH03117687A (en) |
AT (1) | ATE97195T1 (en) |
DE (2) | DE3928411A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4219663C2 (en) * | 1992-06-16 | 1996-01-18 | Prominent Dosiertechnik Gmbh | Liquid dosing pump |
US5290159A (en) * | 1993-03-04 | 1994-03-01 | Exxon Production Research Company | Downhole pump of constant differential hydraulic pressure |
US6164924A (en) * | 1998-09-01 | 2000-12-26 | Oil-Rite Corporation | Piston and drive assembly for use in a pump |
CN110194364B (en) * | 2019-05-08 | 2021-03-02 | 胡乔生 | Two-stage metering distribution system and control method thereof |
DE102022115955A1 (en) | 2022-06-27 | 2023-12-28 | Prominent Gmbh | Dosing pump with stroke adjustment |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4898632A (en) * | 1972-03-27 | 1973-12-14 | ||
DE7733135U1 (en) * | 1977-10-27 | 1978-03-23 | Sukatsch, Alexander, 6702 Bad Duerkheim | DOSING PUMP |
DE2831437C2 (en) * | 1978-07-18 | 1983-12-15 | Webasto-Werk W. Baier GmbH & Co, 8035 Gauting | Feed and metering pump |
DE2831625C2 (en) * | 1978-07-19 | 1987-01-29 | Lang Apparatebau GmbH, 8227 Siegsdorf | Device for dosing a chemical solution into flowing fresh liquid |
US4278406A (en) * | 1979-11-07 | 1981-07-14 | R. W. Beckett Corporation | Electromagnetic pump |
DE3134940C2 (en) * | 1981-09-03 | 1983-12-15 | Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt | Dosing pump |
DE3210821C2 (en) * | 1982-03-24 | 1986-01-09 | Grünbeck Wasseraufbereitung GmbH, 8884 Höchstädt | Dosing pump |
DE3300461A1 (en) * | 1983-01-08 | 1984-08-30 | Lang Apparatebau GmbH, 8227 Siegsdorf | PISTON DIAPHRAGM PUMP |
-
1989
- 1989-08-28 DE DE3928411A patent/DE3928411A1/en active Granted
-
1990
- 1990-08-20 US US07/570,147 patent/US5017105A/en not_active Expired - Fee Related
- 1990-08-22 EP EP90116104A patent/EP0415259B1/en not_active Expired - Lifetime
- 1990-08-22 AT AT90116104T patent/ATE97195T1/en not_active IP Right Cessation
- 1990-08-22 DE DE90116104T patent/DE59003436D1/en not_active Expired - Fee Related
- 1990-08-27 JP JP2222671A patent/JPH03117687A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE3928411A1 (en) | 1991-03-07 |
ATE97195T1 (en) | 1993-11-15 |
DE59003436D1 (en) | 1993-12-16 |
JPH03117687A (en) | 1991-05-20 |
DE3928411C2 (en) | 1993-05-13 |
EP0415259A1 (en) | 1991-03-06 |
US5017105A (en) | 1991-05-21 |
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