EP2034186A2 - Device for supplying liquids - Google Patents

Device for supplying liquids Download PDF

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Publication number
EP2034186A2
EP2034186A2 EP08015254A EP08015254A EP2034186A2 EP 2034186 A2 EP2034186 A2 EP 2034186A2 EP 08015254 A EP08015254 A EP 08015254A EP 08015254 A EP08015254 A EP 08015254A EP 2034186 A2 EP2034186 A2 EP 2034186A2
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EP
European Patent Office
Prior art keywords
pump
borne noise
electric motor
measured
change
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.)
Granted
Application number
EP08015254A
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German (de)
French (fr)
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EP2034186A3 (en
EP2034186B1 (en
Inventor
Thomas Haar
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Saeta GmbH and Co KG
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Saeta GmbH and Co KG
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Publication of EP2034186A2 publication Critical patent/EP2034186A2/en
Publication of EP2034186A3 publication Critical patent/EP2034186A3/en
Application granted granted Critical
Publication of EP2034186B1 publication Critical patent/EP2034186B1/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
    • F04B51/00Testing machines, pumps, or pumping installations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10Other safety measures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/08Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28Safety arrangements; Monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00Rotary-piston machines or pumps
    • F04C2/30Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00Components
    • F04C2240/80Other components
    • F04C2240/81Sensor, e.g. electronic sensor for control or monitoring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00Control; Monitoring or safety arrangements
    • F04C2270/13Noise
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00Control; Monitoring or safety arrangements
    • F04C2270/80Diagnostics

Definitions

  • the invention relates to a device for conveying liquids, in particular for dispensing liquids from tank trucks according to claim 1.
  • the object of the invention is to provide a device of simple construction and action for conveying liquids, in particular for dispensing liquids from a tanker truck.
  • a structure-borne sound pickup is arranged on the housing of the pump, which is connected to an evaluation device for the measured structure-borne noise of the pump housing.
  • the evaluation device generates a signal for the control device of the drive motor the pump when a change in the measured structure-borne noise is detected.
  • the invention is based on the fact that in displacement pumps when sucking air, the noise of the pump is changed. The reason for this is the sudden pressure increase in the pump, which causes the small air bubbles present to implode. With the help of a structure-borne sound pickup, this phenomenon can now be used to detect air bubbles in liquids.
  • structure-borne noise must be suitably analyzed, for example with regard to its frequency and amplitude.
  • the drive motor of the pump is activated accordingly.
  • the drive motor can be switched off and a discharge valve can be locked.
  • the control device can reduce the drive motor in its speed, or down regulate until no more air bubbles occur.
  • the single figure shows a schematic diagram of the device according to the invention.
  • a pump 10 is shown, for example, a vane pump. It is connected to a suction duct 12, e.g. led to the chambers of a tanker, not shown. For several chambers, the line 12 is a manifold.
  • a pressure line 14 of the pump 10 passes via a dispensing valve 16 to a dispensing line 18, which e.g. connected to a hose, for conveying the liquid from the tanker in a receiving tank (also not shown).
  • the dispensing valve 16 is actuated by an actuator 20. Before the dispensing valve, a volumeter, not shown, is arranged.
  • the vane pump 10 is driven by an electric motor 22, which in turn is controlled by a control device 24.
  • the electric motor 22 may be e.g. be a three-phase motor.
  • a structure-borne sound pickup 26 With the housing of the vane pump 10, not shown, a structure-borne sound pickup 26 is connected.
  • the structure-borne sound pickup 26 registers the structure-borne noise caused in the housing.
  • the structure-borne sound signal of the structure-borne sound receiver 26 reaches an evaluation device 28, which analyzes the structure-borne sound with regard to the amplitude and / or frequency.
  • the frequency or amplitude spectrum changes with the appearance of air bubbles in the suction line 12. If this change is significant, the control device 24 is driven so that either the motor 22 is turned off or reduced in its speed. In the latter case, the speed can be adjusted so that no more air bubbles occur.
  • the Dispensing valve 16 With the switching off of the drive motor 22 may also be the Dispensing valve 16 are transferred to the blocking state, so that no more gravity delivery occurs.
  • the volume meter is arranged, with which the dispensed amount of liquid is measured. Measuring air interferes with the accuracy of the quantity measurement.

Abstract

A device (26) for picking up structure-borne noise fits on the casing of a positive-displacement pump (10), links to an evaluating device (28) for measured structure-borne noise in the pump's casing and emits a signal to a control device (24) if a change in the structure-borne noise is noticed.

Description

Die Erfmdung bezieht sich auf eine Vorrichtung zum Fördern von Flüssigkeiten, insbesondere zur Abgabe von Flüssigkeiten aus Tankwagen nach dem Anspruch 1.The invention relates to a device for conveying liquids, in particular for dispensing liquids from tank trucks according to claim 1.

Die Abgabe von Flüssigkeiten aus Tankwagen erfolgt entweder über Schwerkraft oder den Einsatz von Pumpen. Für die Abgabe der Flüssigkeit wird ein Abgabeventil geöffnet. Es wird geschlossen, wenn das gewünschte Volumen abgegeben worden ist oder wenn Umstände auftreten, welche eine weitere Abgabe unzulässig werden lassen. Dies ist der Fall bei Auftreten eines bestimmten Anteils von Gaseinschlüssen, die bei volumetrischen Meßsystemen naturgemäß zu einer Fehlmessung führen.The discharge of liquids from tankers is done either by gravity or the use of pumps. For dispensing the liquid, a dispensing valve is opened. It will be closed when the desired volume has been dispensed, or when circumstances arise which render another charge inadmissible. This is the case when a certain proportion of gas inclusions occurs, which naturally leads to a false measurement in volumetric measuring systems.

Aus DE 195 40 884 A1 ist ein Verfahren zum Messen des Volumens durchströmender Flüssigkeiten bekannt geworden, bei dem der Gasanteil der durch eine Leitungsstrecke strömenden Flüssigkeit erfasst und die Abweichung des erfaßten Gasanteils von einem zulässigen Wert ermittelt wird. Der Volumenstrom der Flüssigkeit wird in Abhängigkeit von der ermittelten Abweichung in mehreren Stufen oder stetig beeinflusst.Out DE 195 40 884 A1 a method for measuring the volume of liquid flowing through has become known in which the gas fraction of the liquid flowing through a line section is detected and the deviation of the detected gas content from a permissible value is determined. The volume flow of the liquid is influenced depending on the determined deviation in several stages or continuously.

Aus EP 0 035 217 A2 ist eine Vorrichtung zur Verhinderung des Mitmessens gasförmiger Beimengen bei der Abgabe von Flüssigkeiten bekannt geworden, bei der eine Druckmessvorrichtung den Druck einer geodätischen Zulaufhöhe oberhalb des Druckmesspunkts misst. Eine Absperrarmatur ist im Querschnitt verstellbar und wird entsprechend dem Ausgangssignal der Druckmessvorrichtung betätigt. Gelangt der gemessene Druck unter einen vorgegebenen Wert, wird der Strömungsquerschnitt des Abgabeventils reduziert. Hierbei wird von der Tatsache Gebrauch gemacht, dass solange ein ausreichender positiver Druck vor dem Volumenzähler ansteht, der Anteil gasförmiger Beimengen unterhalb zulässiger Grenzen liegt.Out EP 0 035 217 A2 For example, there has been known a device for preventing gaseous entrainment during liquid dispensing, in which a pressure measuring device measures the pressure of a geodetic head above the pressure measuring point. A shut-off valve is adjustable in cross-section and is in accordance with the output signal of the pressure measuring device actuated. If the measured pressure falls below a predetermined value, the flow cross-section of the dispensing valve is reduced. In this case, use is made of the fact that as long as there is sufficient positive pressure in front of the volume meter, the proportion of gaseous admixtures is below admissible limits.

Aus US 5,232,006 ist bekannt geworden, das Mitmessen von Gasanteilen in einer Abgabeleitung für Flüssigkeiten zu verhindern, wobei ein Gasblasensensor sich innerhalb der Flüssigkeitsströmung befindet und z.B. kapazitiv arbeitet. Ein Homogenitätsmesser misst über den Gasblasensensor die Homogenität der Flüssigkeit und sperrt das Abgabeventil, wenn die Homogenität nicht mehr gewährleistet ist. Das sich vor dem Abgabeventil ansammelnde Gas wird über eine Entgasungsleitung in den Abgabetank zurückgeführt.Out US 5,232,006 It has become known to prevent the metering of gas fractions in a discharge line for liquids, wherein a gas bubble sensor is located within the liquid flow and, for example, operates capacitively. A homogeneity meter measures the homogeneity of the liquid via the gas bubble sensor and locks the dispensing valve if homogeneity is no longer guaranteed. The gas accumulating in front of the dispensing valve is returned to the dispensing tank via a degassing line.

Der Erfmdung liegt die Aufgabe zugrunde, eine einfach aufgebaute und wirkende Vorrichtung zur Förderung von Flüssigkeiten, insbesondere zur Abgabe von Flüssigkeiten aus einem Tankwagen zu schaffen.The object of the invention is to provide a device of simple construction and action for conveying liquids, in particular for dispensing liquids from a tanker truck.

Diese Aufgabe wird durch die Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst.This object is achieved by the device having the features of claim 1.

Bei der erfindungsgemäßen Vorrichtung ist am Gehäuse der Pumpe ein Körperschallaufnehmer angeordnet, der mit einer Auswertevorrichtung für den gemessenen Körperschall des Pumpengehäuses verbunden ist. Die Auswertevorrichtung erzeugt ein Signal für die Steuervorrichtung des Antriebsmotors der Pumpe, wenn eine Veränderung des gemessenen Körperschalls erfasst wird.In the apparatus of the invention, a structure-borne sound pickup is arranged on the housing of the pump, which is connected to an evaluation device for the measured structure-borne noise of the pump housing. The evaluation device generates a signal for the control device of the drive motor the pump when a change in the measured structure-borne noise is detected.

Die Erfindung geht von der Tatsache aus, dass bei Verdrängerpumpen beim Ansaugen von Luft das Geräusch der Pumpe verändert wird. Ursache hierfür ist die schlagartige Druckerhöhung in der Pumpe, die die vorhandenen kleinen Luftblasen zum Implodieren bringt. Mit Hilfe eines Körperschallaufnehmers kann nun dieses Phänomen zum Nachweis von Luftblasen in Flüssigkeiten verwendet werden.The invention is based on the fact that in displacement pumps when sucking air, the noise of the pump is changed. The reason for this is the sudden pressure increase in the pump, which causes the small air bubbles present to implode. With the help of a structure-borne sound pickup, this phenomenon can now be used to detect air bubbles in liquids.

Der Körperschall muss naturgemäß in geeigneter Weise analysiert werden, beispielsweise im Hinblick auf seine Frequenz und die Amplitude.Naturally, structure-borne noise must be suitably analyzed, for example with regard to its frequency and amplitude.

Stellt die Auswertevorrichtung eine Änderung des Körperschalls fest, wird der Antriebsmotor der Pumpe entsprechend angesteuert. Um eine Verfälschung von Messergebnissen auf der Druckseite der Pumpe zu verhindern, kann der Antriebsmotor abgeschaltet und ein Abgabeventil gesperrt werden. Bei einem ersten Auftreten von Luftblasen, welche sich bereits in einer Änderung des Körperschalls bemerkbar machen, kann die Steuervorrichtung den Antriebsmotor in seiner Drehzahl herabsetzen, bzw. soweit herunterregeln, bis keine Luftblasen mehr auftreten.If the evaluation device detects a change in structure-borne noise, the drive motor of the pump is activated accordingly. In order to prevent a falsification of measurement results on the pressure side of the pump, the drive motor can be switched off and a discharge valve can be locked. At a first occurrence of air bubbles, which make themselves felt in a change in structure-borne noise, the control device can reduce the drive motor in its speed, or down regulate until no more air bubbles occur.

Die Erfindung wird nachfolgend anhand einer Zeichnung kurz erläutert.The invention will be explained briefly with reference to a drawing.

Die einzige Figur zeigt ein schematisches Schaltbild der Vorrichtung nach der Erfindung.The single figure shows a schematic diagram of the device according to the invention.

In der Figur ist eine Pumpe 10 dargestellt, beispielsweise eine Flügelzellenpumpe. Sie ist mit einer Ansaugleitung 12 verbunden, die z.B. zu den Kammern eines nicht gezeigten Tankwagens geführt ist. Bei mehreren Kammern ist die Leitung 12 eine Sammelleitung. Eine Druckleitung 14 der Pumpe 10 gelangt über ein Abgabeventil 16 zu einer Abgabeleitung 18, welche z.B. mit einem Schlauch verbunden ist, zur Förderung der Flüssigkeit aus dem Tankwagen in einen Aufnahmetank (ebenfalls nicht dargestellt). Das Abgabeventil 16 wird von einem Aktuator 20 betätigt. Vor dem Abgabeventil ist ein nicht gezeigter Volumenmesser angeordnet.In the figure, a pump 10 is shown, for example, a vane pump. It is connected to a suction duct 12, e.g. led to the chambers of a tanker, not shown. For several chambers, the line 12 is a manifold. A pressure line 14 of the pump 10 passes via a dispensing valve 16 to a dispensing line 18, which e.g. connected to a hose, for conveying the liquid from the tanker in a receiving tank (also not shown). The dispensing valve 16 is actuated by an actuator 20. Before the dispensing valve, a volumeter, not shown, is arranged.

Die Flügelzellenpumpe 10 wird von einem Elektromotor 22 angetrieben, der seinerseits von einer Steuervorrichtung 24 gesteuert ist. Der Elektromotor 22 kann z.B. ein Drehstrommotor sein.The vane pump 10 is driven by an electric motor 22, which in turn is controlled by a control device 24. The electric motor 22 may be e.g. be a three-phase motor.

Mit dem nicht näher dargestellten Gehäuse der Flügelzellenpumpe 10 ist ein Körperschallaufnehmer 26 verbunden. Der Körperschallaufnehmer 26 registriert den im Gehäuse verursachten Körperschall. Das Körperschallsignal des Körperschallaufnehmers 26 gelangt zu einer Auswertevorrichtung 28, welche den Körperschall im Hinblick auf die Amplitude und/oder Frequenz analysiert. Das Frequenz- bzw. Amplitudenspektrum ändert sich mit dem Auftauchen von Luftbläschen in der Ansaugleitung 12. Ist diese Änderung signifikant, wird die Steuervorrichtung 24 angesteuert, damit entweder der Motor 22 abgeschaltet oder in seiner Drehzahl reduziert wird. In letzterem Fall kann die Drehzahl so eingestellt werden, dass keine Luftblasen mehr auftreten. Mit dem Abschalten des Antriebsmotors 22 kann außerdem das Abgabeventil 16 in den Sperrzustand überführt werden, damit auch keine Schwerkraftabgabe mehr erfolgt. Bekanntlich ist bei einer derartigen Vorrichtung vor oder hinter dem Abgabeventil 16 der Volumenzähler angeordnet, mit dem die abgegebene Flüssigkeitsmenge gemessen wird. Ein Mitmessen von Luft beeinträchtigt die Genauigkeit der Mengenmessung.With the housing of the vane pump 10, not shown, a structure-borne sound pickup 26 is connected. The structure-borne sound pickup 26 registers the structure-borne noise caused in the housing. The structure-borne sound signal of the structure-borne sound receiver 26 reaches an evaluation device 28, which analyzes the structure-borne sound with regard to the amplitude and / or frequency. The frequency or amplitude spectrum changes with the appearance of air bubbles in the suction line 12. If this change is significant, the control device 24 is driven so that either the motor 22 is turned off or reduced in its speed. In the latter case, the speed can be adjusted so that no more air bubbles occur. With the switching off of the drive motor 22 may also be the Dispensing valve 16 are transferred to the blocking state, so that no more gravity delivery occurs. As is known, in such a device in front of or behind the dispensing valve 16, the volume meter is arranged, with which the dispensed amount of liquid is measured. Measuring air interferes with the accuracy of the quantity measurement.

Claims (5)

Vorrichtung zur Förderung von Flüssigkeiten, insbesondere zur Abgabe von Flüssigkeiten aus Tankwagen, mit einer Verdrängerpumpe in eine Abgabeleitung, die von einem Elektromotor angetrieben ist, einer Steuervorrichtung für den Elektromotor und einer Vorrichtung zur Bestimmung von Gasanteilen in der Flüssigkeitsströmung, dadurch gekennzeichnet, dass am Gehäuse der Pumpe (10) ein Körperschallaufnehmer (26) angeordnet ist, der mit einer Auswertevorrichtung (28) für den gemessenen Körperschall des Pumpengehäuses verbunden ist und der ein Signal auf die Steuervorrichtung (24) gibt, wenn eine Veränderung des Körperschalls gemessen wird.Apparatus for conveying liquids, in particular for dispensing liquids from tank trucks, with a positive displacement pump in a discharge line, which is driven by an electric motor, a control device for the electric motor and a device for determining gas fractions in the liquid flow, characterized in that the housing the pump (10) a structure-borne sound pickup (26) is arranged, which is connected to an evaluation device (28) for the measured structure-borne noise of the pump housing and which gives a signal to the control device (24) when a change in structure-borne noise is measured. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Elektromotor (22) abgeschaltet wird, wenn die Veränderung einen vorgegebenen Wert erreicht.Apparatus according to claim 1, characterized in that the electric motor (22) is switched off when the change reaches a predetermined value. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Drehzahl des Elektromotors (22) verringert wird, wenn eine Veränderung des Körperschalls gemessen wird.Apparatus according to claim 1 or 2, characterized in that the rotational speed of the electric motor (22) is reduced when a change in the structure-borne noise is measured. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Auswertevorrichtung (28) für eine Frequenz und/oder Amplitudenanalyse ausgelegt ist.Device according to one of claims 1 to 3, characterized in that the evaluation device (28) is designed for a frequency and / or amplitude analysis. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Verdrängerpumpe eine Flügelzellenpumpe ist.Device according to one of claims 1 to 4, characterized in that the positive displacement pump is a vane pump.
EP08015254.9A 2007-09-06 2008-08-29 Device for supplying liquids Active EP2034186B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200720012542 DE202007012542U1 (en) 2007-09-06 2007-09-06 Device for conveying liquids

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EP2034186A2 true EP2034186A2 (en) 2009-03-11
EP2034186A3 EP2034186A3 (en) 2011-07-06
EP2034186B1 EP2034186B1 (en) 2015-07-01

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008047122A1 (en) 2008-09-15 2010-04-22 Bartec Gmbh Device for dispensing liquid from a tank and method for emptying a line section
CN110291293B (en) * 2017-02-16 2021-07-20 液体控制有限公司 System and method for delivering liquid fuel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035217A2 (en) 1980-02-29 1981-09-09 ALFONS HAAR Maschinenbau GmbH & Co. KG Device for preventing the conjunctive mensuration of gaseous additional mixtures in dispensing liquids
US5232006A (en) 1990-12-07 1993-08-03 F. Wennstrom Aktiebolag System for separating gas from a liquid flow whose volume is to be measured
DE19540884A1 (en) 1995-11-02 1997-05-07 Haar Maschbau Alfons Measuring volume of flowing liquid without measuring faults by unallowed contained gas portions

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520734A1 (en) * 1985-06-10 1986-12-11 Kraftwerk Union AG, 4330 Mülheim Method and device for operating a centrifugal pump
DE19517289A1 (en) * 1995-05-11 1996-11-14 Klein Schanzlin & Becker Ag Monitoring system for determining a cavitation intensity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035217A2 (en) 1980-02-29 1981-09-09 ALFONS HAAR Maschinenbau GmbH & Co. KG Device for preventing the conjunctive mensuration of gaseous additional mixtures in dispensing liquids
US5232006A (en) 1990-12-07 1993-08-03 F. Wennstrom Aktiebolag System for separating gas from a liquid flow whose volume is to be measured
DE19540884A1 (en) 1995-11-02 1997-05-07 Haar Maschbau Alfons Measuring volume of flowing liquid without measuring faults by unallowed contained gas portions

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EP2034186A3 (en) 2011-07-06
EP2034186B1 (en) 2015-07-01
DE202007012542U1 (en) 2007-11-08

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