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EP0361260B1 - Piston pump for dosing flowable substances - Google Patents

Piston pump for dosing flowable substances Download PDF

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Publication number
EP0361260B1
EP0361260B1 EP89117225A EP89117225A EP0361260B1 EP 0361260 B1 EP0361260 B1 EP 0361260B1 EP 89117225 A EP89117225 A EP 89117225A EP 89117225 A EP89117225 A EP 89117225A EP 0361260 B1 EP0361260 B1 EP 0361260B1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
valve element
piston pump
throat
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
EP89117225A
Other languages
German (de)
French (fr)
Other versions
EP0361260A3 (en
EP0361260A2 (en
Inventor
Hermann Ophardt
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.)
OPHARDT PRODUCT HERMANN OPHARDT
Original Assignee
OPHARDT PRODUCT HERMANN OPHARDT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by OPHARDT PRODUCT HERMANN OPHARDT filed Critical OPHARDT PRODUCT HERMANN OPHARDT
Priority to AT8989117225T priority Critical patent/ATE104837T1/en
Publication of EP0361260A2 publication Critical patent/EP0361260A2/en
Publication of EP0361260A3 publication Critical patent/EP0361260A3/en
Application granted granted Critical
Publication of EP0361260B1 publication Critical patent/EP0361260B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
    • B67D7/02—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants
    • B67D7/0205—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring liquids other than fuel or lubricants by manually operable pumping apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-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
    • B05B11/10—Pump 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
    • B05B11/1001—Piston pumps
    • B05B11/1023—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem

Definitions

  • the invention relates to a piston pump for metering flowable substances, for example disinfectants, liquid soaps or creams, with a permanently spring-loaded hollow piston, which has a radial groove at its rear end with one or more passage openings, an annular, elastic, axially displaceable in the groove Valve element is arranged, which, when the piston is actuated, lies sealingly and slidably on the cylinder wall, during the pressure stroke it opens a passage opening for the substance to be conveyed, which blocks it during the suction stroke.
  • a piston pump for metering flowable substances for example disinfectants, liquid soaps or creams
  • a permanently spring-loaded hollow piston which has a radial groove at its rear end with one or more passage openings, an annular, elastic, axially displaceable in the groove Valve element is arranged, which, when the piston is actuated, lies sealingly and slidably on the cylinder wall, during the pressure stroke it opens a passage opening for the substance to be conveyed, which blocks
  • the invention is therefore based on the object of greatly simplifying a piston pump of the type mentioned at the outset in terms of construction and production technology and reliably sealing the pump so that it does not drip even when pumping low-viscosity substances.
  • this object is achieved in that a sleeve is positively inserted into the cylinder.
  • This sleeve has a radially circumferential constriction which serves as a stop for the valve element which, in the initial position of the piston, lies against the constriction and blocks the passage openings.
  • the pressure of the return spring is used to press the valve element sealingly between the piston and the constriction of the sleeve.
  • the hollow piston (1) is closed at its rear end and there has a radial groove (2) in which an O-ring (3) is axially displaceable, the outer diameter of which is larger than that of the piston.
  • a radial groove (2) in which an O-ring (3) is axially displaceable, the outer diameter of which is larger than that of the piston.
  • one or more passage openings (4) are provided which open into the interior of the piston (1).
  • a sleeve (6) which is provided with a radially circumferential constriction (7a), is inserted into the cylinder (5a) in a form-fitting manner and sealed with an O-ring (6a).
  • the constriction (7a) obtained by deforming the sleeve forms a circumferential annular groove (10) on the outside of the sleeve, which receives the O-ring (6a).
  • the circumferential constriction (7a) separates the cylinder (5a) into two cylinder spaces, the cylinder diameter remaining the same on both sides of the constriction (7a).
  • the piston (1) is sealed in the upper cylinder chamber (7) using a piston ring (14) guided.
  • the return spring (9) is clamped between the cylinder base (12) and the piston (1) in the lower cylinder chamber (8) and is constantly under tension.
  • FIGS. 2 and 2a shows a longitudinal section of a piston pump according to the invention.
  • the piston (1) corresponds to that described in FIG. 1.
  • a sleeve (6) is inserted in the front section of the stepped cylinder (5a) in which the piston (1) is guided tightly using a piston ring (14).
  • the sleeve (6) has a collar (7b) at its front end and an inner circumferential constriction (7a) at its rear end, which forms the stop.
  • the original diameter difference of the stepped cylinder (5a) is compensated for by the sleeve (6) used, so that the cylinder diameter is the same size on both sides of the constriction (7a).
  • a return spring (9) is clamped between the cylinder base (12) and the piston (1) and is constantly under tension.

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

Abstract

A piston pump for dosing flowable substances, for example disinfectant, liquid soaps or creams, has a permanently spring-loaded piston (1) which has a radial groove (2) in which an axially displaceable annular valve element (3) is arranged. In the rest position of the piston (1), the annular valve element (3) is pressed with the aid of the return spring (15) against a circumferential stop ring (6) arranged in the cylinder. By virtue of this arrangement, fluid-tight sealing of the pump is achieved, thus preventing afterdribble in an effective way. <IMAGE>

Description

Die Erfindung betrifft eine Kolbenpumpe zum Dosieren fließfähiger Substanzen, beispielsweise Desinfektionsmittel, flüssige Seifen oder Cremes, mit einem dauernd federbelasteten hohlen Kolben, der an seinem hinteren Ende eine radiale Nut mit einer oder mehreren Durchlaßöffnungen aufweist, wobei in der Nut axial verschiebbar ein ringförmiges, elastisches Ventilelement angeordnet ist, das bei Betätigung des Kolbens dichtend und gleitbar an der Zylinderwandung anliegt, wobei es während des Druckhubes eine Durchlaßöffnung für die zu fördernde Substanz freigibt, die es während des Saughubes blockiert.The invention relates to a piston pump for metering flowable substances, for example disinfectants, liquid soaps or creams, with a permanently spring-loaded hollow piston, which has a radial groove at its rear end with one or more passage openings, an annular, elastic, axially displaceable in the groove Valve element is arranged, which, when the piston is actuated, lies sealingly and slidably on the cylinder wall, during the pressure stroke it opens a passage opening for the substance to be conveyed, which blocks it during the suction stroke.

Eine bekannte Kolbenpumpe dieser Art ist in dem US-Patent 3,187,960 beschrieben. Diese Kolbenpumpe ist konstruktiv und somit auch fertigungstechnisch kompliziert und teuer. Die Möglichkeiten bei der Materialauswahl sind dadurch sehr eingeschränkt, eine Metallausführung beispielsweise wäre enorm aufwendig und daher unwirtschaftlich. Daraus ergibt sich wiederum eine Einschränkung des Einsatzbereiches dieser Pumpe in Bezug auf die zu fördernden Substanzen. Problematisch sind insbesondere dünnflüssige Substanzen, die gerne nachtropfen, wenn das Ventilelement in der Endstellung des Kolbens nicht zuverlässig abdichtet.A known piston pump of this type is described in US Patent 3,187,960. This piston pump is constructive and therefore also technically complicated and expensive. The possibilities in the choice of materials are very limited, a metal version, for example, would be enormously complex and therefore uneconomical. This in turn results in a limitation of the area of application of this pump with regard to the substances to be pumped. Particularly problematic are low-viscosity substances that like to drip if the valve element does not seal reliably in the end position of the piston.

Eine weitere bekannte Kolbenpumpe ist in dem US-Patent 3,257,961 beschrieben.Another known piston pump is described in U.S. Patent 3,257,961.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Kolbenpumpe der eingangs genannten Art konstruktiv und fertigungstechnisch stark zu vereinfachen und die Pumpe zuverlässig abzudichten, so daß sie auch bei der Förderung dünnflüssiger Substanzen nicht nachtropft.The invention is therefore based on the object of greatly simplifying a piston pump of the type mentioned at the outset in terms of construction and production technology and reliably sealing the pump so that it does not drip even when pumping low-viscosity substances.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß in den Zylinder formschlüssig eine Hülse eingesetzt wird. Diese Hülse weist eine radial umlaufende Einschnürung auf, die als Anschlag für das Ventilelement dient, welches in Ausgangsstellung des Kolbens gegen die Einschnürung liegt und die Durchlaßöffnungen blockiert.According to the invention this object is achieved in that a sleeve is positively inserted into the cylinder. This sleeve has a radially circumferential constriction which serves as a stop for the valve element which, in the initial position of the piston, lies against the constriction and blocks the passage openings.

Durch diese Ausbildung wird der Druck der Rückstellfeder ausgenutzt, um das Ventilelement dichtend zwischen den Kolben und die Einschnürung der Hülse zu drücken.With this design, the pressure of the return spring is used to press the valve element sealingly between the piston and the constriction of the sleeve.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand der Figuren 1 und 1a, die einen Längsschnitt einer erfindungsgemäßen Kolbenpumpe zeigen, näher erläutert.An embodiment of the invention is explained below with reference to Figures 1 and 1a, which show a longitudinal section of a piston pump according to the invention.

Der hohl ausgebildete Kolben (1) ist an seinem hinteren Ende verschlossen und weist dort eine radiale Nut (2) auf, in der axial verschiebbar ein O-Ring (3) angeordnet ist, dessen Außendurchmesser größer ist als derjenige des Kolbens. In der Nut (2) ist eine oder mehrere Durchlaßöffnungen (4) vorgesehen, die in das Innere des Kolbens (1) münden.The hollow piston (1) is closed at its rear end and there has a radial groove (2) in which an O-ring (3) is axially displaceable, the outer diameter of which is larger than that of the piston. In the groove (2) one or more passage openings (4) are provided which open into the interior of the piston (1).

In den Zylinder (5a) ist formschlüssig und mit einem O-Ring (6a) abgedichtet eine Hülse (6) eingesetzt, die mit einer radial umlaufenden Einschnürung (7a) versehen ist. Die durch Verformung der Hülse erhaltene Einschnürung (7a) bildet auf der Außenseite der Hülse eine umlaufende Ringnut (10), die den O-Ring (6a) aufnimmt. Die umlaufende Einschnürung (7a) trennt den Zylinder (5a) in zwei Zylinderräume, wobei der Zylinderdurchmesser beidseitig der Einschnürung (7a) gleich bleibt. Der Kolben (1) wird im oberen Zylinderraum (7) unter Verwendung eines Kolbenrings (14) dichtschließend geführt. Die Rückstellfeder (9) ist zwischen dem Zylinderboden (12) und dem Kolben (1) im unteren Zylinderraum (8) verspannt und steht ständig unter Vorspannung.A sleeve (6), which is provided with a radially circumferential constriction (7a), is inserted into the cylinder (5a) in a form-fitting manner and sealed with an O-ring (6a). The constriction (7a) obtained by deforming the sleeve forms a circumferential annular groove (10) on the outside of the sleeve, which receives the O-ring (6a). The circumferential constriction (7a) separates the cylinder (5a) into two cylinder spaces, the cylinder diameter remaining the same on both sides of the constriction (7a). The piston (1) is sealed in the upper cylinder chamber (7) using a piston ring (14) guided. The return spring (9) is clamped between the cylinder base (12) and the piston (1) in the lower cylinder chamber (8) and is constantly under tension.

Ein weiteres Ausführungsbeispiel der Erfindung wird im folgenden anhand der Figuren 2 und 2a, die wiederum einen Längsschnitt einer erfindungsgemäßen Kolbenpumpe zeigt, näher erläutert.Another exemplary embodiment of the invention is explained in more detail below with reference to FIGS. 2 and 2a, which in turn shows a longitudinal section of a piston pump according to the invention.

Der Kolben (1) entspricht dem in der Figur 1 beschriebenen. In den vorderen Abschnitt des stufig ausgeführten Zylinders (5a) ist formschlüssig eine Hülse (6) eingesetzt, in der der Kolben (1) unter Verwendung eines Kolbenrings (14) dichtschließend geführt wird. Die Hülse (6) weist an ihrem vorderen Ende einen Bund (7b) und an ihrem hinteren Ende eine innen umlaufende Einschnürung (7a) auf, die den Anschlag bildet.The piston (1) corresponds to that described in FIG. 1. A sleeve (6) is inserted in the front section of the stepped cylinder (5a) in which the piston (1) is guided tightly using a piston ring (14). The sleeve (6) has a collar (7b) at its front end and an inner circumferential constriction (7a) at its rear end, which forms the stop.

Die ursprüngliche Durchmesserdifferenz des stufig ausgeführten Zylinders (5a) wird durch die eingesetzte Hülse (6) ausgeglichen, so daß der Zylinderdurchmesser beiderseits der Einschnürung (7a) gleich groß ist.The original diameter difference of the stepped cylinder (5a) is compensated for by the sleeve (6) used, so that the cylinder diameter is the same size on both sides of the constriction (7a).

Eine Rückstellfeder (9) ist zwischen dem Zylinderboden (12) und dem Kolben (1) verspannt und steht dauernd unter Vorspannung.A return spring (9) is clamped between the cylinder base (12) and the piston (1) and is constantly under tension.

Claims (2)

  1. Piston pump for dosing flowable substances, e.g., disinfectants, liquid soaps and creams provided with a spring-loaded hollow piston equipped at his tail end with a radial groove with one or several passage openings being provided in the groove axially movable an annular elastic valve element which when actuating the piston is closely and sliding fitted at the cylinder wall releasing during the pressure stroke a passage opening for the substance to be transported blocking it during the suction stroke characterized in that into the cylinder (5a) is form-fitted a bushing (6) showing a radial throat (7a) serving as stopper for the valve element (3) which in initial position of the piston(1) is fitted against the throat (7a) and blocks the passage opening (4).
  2. Piston pump according to claim 1 characterized in that the cylinder (5a) is developed as stepped cylinder and the bushing (6) is provided at its front end with a collar (7b) and the throat (7a) is arranged at its tail end.
EP89117225A 1988-09-17 1989-09-18 Piston pump for dosing flowable substances Expired - Lifetime EP0361260B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT8989117225T ATE104837T1 (en) 1988-09-17 1989-09-18 PISTON PUMP FOR DOSING FLOWABLE SUBSTANCES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8811811U 1988-09-17
DE8811811U DE8811811U1 (en) 1988-09-17 1988-09-17 Piston pump for dosing flowable substances

Publications (3)

Publication Number Publication Date
EP0361260A2 EP0361260A2 (en) 1990-04-04
EP0361260A3 EP0361260A3 (en) 1990-08-01
EP0361260B1 true EP0361260B1 (en) 1994-04-27

Family

ID=6828052

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117225A Expired - Lifetime EP0361260B1 (en) 1988-09-17 1989-09-18 Piston pump for dosing flowable substances

Country Status (3)

Country Link
EP (1) EP0361260B1 (en)
AT (1) ATE104837T1 (en)
DE (2) DE8811811U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341748B4 (en) * 2003-09-08 2017-01-26 Ophardt Product Kg Pump for emptying and hanging container

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426662A1 (en) 2002-12-06 2004-06-09 Boehringer Ingelheim International GmbH Piston pump
EP2441365B1 (en) 2010-10-12 2019-05-01 CC Clinic Consult GmbH Liquid feeding assembly
USD1061260S1 (en) 2023-07-18 2025-02-11 S. C. Johnson & Son, Inc. Dispenser

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1201684B (en) * 1964-01-28 1965-09-23 Erich Pfeiffer K G Metallwaren Single-acting, hand-operated piston pump installed in a vessel
US3257961A (en) * 1964-04-23 1966-06-28 Holmes T J Co Pump
US3187960A (en) * 1964-05-08 1965-06-08 Sterling Drug Inc Non-metallic pump dispenser
US3319577A (en) * 1965-02-25 1967-05-16 Margrete L Stinnes Sliding seal and valve for reciprocating pump plunger
US3500760A (en) * 1968-04-22 1970-03-17 Holmes T J Co Pump for an atomizer or the like
DK125729B (en) * 1970-03-19 1973-04-30 Broen Armatur As Dosing device for liquids.
FR2082807A5 (en) * 1970-03-26 1971-12-10 Step Soc Tech Pulverisation
GB1527224A (en) * 1975-09-17 1978-10-04 Metal Box Co Ltd Device for producing a jet or spray of liquid
FR2606643A1 (en) * 1986-11-17 1988-05-20 Congio Gerard Syringe which is rendered inoperative after the first use

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10341748B4 (en) * 2003-09-08 2017-01-26 Ophardt Product Kg Pump for emptying and hanging container

Also Published As

Publication number Publication date
EP0361260A3 (en) 1990-08-01
DE58907565D1 (en) 1994-06-01
EP0361260A2 (en) 1990-04-04
ATE104837T1 (en) 1994-05-15
DE8811811U1 (en) 1988-10-27

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