EP2249033A2 - Equalization of the supply flow of oscillating pressure pumps - Google Patents
Equalization of the supply flow of oscillating pressure pumps Download PDFInfo
- Publication number
- EP2249033A2 EP2249033A2 EP10004530A EP10004530A EP2249033A2 EP 2249033 A2 EP2249033 A2 EP 2249033A2 EP 10004530 A EP10004530 A EP 10004530A EP 10004530 A EP10004530 A EP 10004530A EP 2249033 A2 EP2249033 A2 EP 2249033A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- positive displacement
- displacement pumps
- oscillating
- pumps
- 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
Links
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 230000010349 pulsation Effects 0.000 description 6
- 230000002411 adverse Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
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- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
-
- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0041—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation by piston speed control
-
- 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
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
- F04B11/0058—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons with piston speed control
-
- 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
- F04B49/00—Control, 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
- F04B49/06—Control using electricity
-
- 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
- F04B49/00—Control, 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
- F04B49/20—Control, 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 by changing the driving speed
Definitions
- the invention relates to a method for equalizing the flow rate in oscillating positive displacement pumps according to the preamble of claim 1.
- the invention also relates to an apparatus for carrying out this method according to the preamble of claim 6.
- the invention is therefore based on the object, the method of the generic type to eliminate the disadvantages described in such a way that it makes it possible to achieve a largely uniform or constant flow rate by means of simple constructive means with reasonable economic effort.
- an apparatus for performing this method is to be created, which is easy to operate.
- the inventive method for equalizing the flow rate in oscillating displacement pumps is based on the essential idea that the generation of the fluid flow in a delivery line by means of at least two oscillating displacement, whose drive motors are controlled so that the total flow generated in the delivery line largely uniform or constant is.
- the displacement pumps are operated in a composite with each other without mechanical coupling.
- the positive displacement pumps are operated synchronized electronically such that a virtually pulsation-free uniform flow rate (volume flow) is generated in the common delivery line.
- the inventive method can be operated such that the drive motor of each positive displacement pump is changed in its rotational speed such that the superimposed flow rates of the positive displacement pumps give a substantially constant total flow.
- the device according to the invention for carrying out the above-mentioned method is provided with at least two oscillating displacement pumps whose pressure line for superimposing the individual Delivery streams is connected to a common delivery line and each having a drive motor, which are operable without mechanical coupling in electronic synchronization to achieve a substantially uniform or constant sum flow.
- the drive of each displacement pump is a highly dynamic drive.
- This may be a servo motor, preferably a permanent-magnet three-phase synchronous servo motor.
- the displacement pumps are diaphragm pumps.
- FIG. 1 The drawing shows, for performing the method according to the invention in the illustrated embodiment, two oscillating positive displacement pumps in the form of diaphragm pumps 1, 2 are provided, the pressure lines 3, 4 are connected to a common feed line 5.
- the mechanically uncoupled diaphragm pumps 1, 2 each have a drive motor 6 and 7, which is designed as a highly dynamic drive.
- This is preferably a servo motor, in particular a permanent-magnet three-phase synchronous servo motor.
- the drive motors 6, 7 of the two diaphragm pumps 1, 2 are operated by exact electronic synchronization such that a substantially uniform or constant sum flow in the common delivery line 5 can be achieved.
- FIG Fig. 2 ad This procedure, which is operated by the method according to the invention, is illustrated by the individual diagrams in FIG Fig. 2 ad shown, in which the pump delivery is 100% each.
- the pressure stroke of each diaphragm pump 1, 2 is shown, wherein the left half of the diagrams in each case the respective measured value course Pressure stroke of the diaphragm pump 1 represents, while the corresponding right half of the diagram shows the measured value course in dashed form during the pressure stroke of the diaphragm pump 2.
- Diagram 2a shows the course of the piston travel over the time t in both diaphragm pumps 1, 2. Since this - in contrast to the prior art - due to the special operation of the drive motors 6, 7 of the two diaphragm pumps 1, 2 is a constant course, results also, how out Fig. 2b can be seen, a constant piston speed.
- the diagrams according to Fig. 3 ac show different measurements of the diaphragm pump 1 (solid line) and the diaphragm pump 2 (dashed line), respectively apply over time t, the diaphragm pumps 1, 2 each have only a reduced flow rate of about 90 ° C.
- the diagram shows according to Fig. 3a the fluid velocity applied over time t without compensation of the loss due to the "dead compression path hK" occurring at the beginning of the pressure stroke.
- this loss of fluid velocity is extremely low compared to the prior art, so it is negligible.
- the pump piston is brought after completion of the suction stroke in the position hK before the actual delivery stroke begins.
- the piston travel then starts at hK, ie the fluid is displaced immediately in the pressure stroke.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Vergleichmäßigung des Förderstroms bei oszillierenden Verdrängerpumpen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for equalizing the flow rate in oscillating positive displacement pumps according to the preamble of
Die Erfindung betrifft außerdem eine Vorrichtung zur Durchführung dieses Verfahrens gemäß dem Oberbegriff des Anspruchs 6.The invention also relates to an apparatus for carrying out this method according to the preamble of
Beim Betrieb oszillierender Verdrängerpumpen ist es aus grundsätzlichen Erwägungen heraus erwünscht, einen weitgehend konstanten Förderstrom zu erzielen. Dies gilt allein schon deswegen, weil ansonsten in der Druck- bzw. Förderleitung nachteilige Erscheinungen auftreten. Diese bestehen z.B. darin, dass bei jedem Druckhub eine Druckpulsation in der Förderleitung entsteht, welche die Leitungen des gesamten Systems nachteilig beeinflussen kann und deshalb mittels gesonderter Pulsationsdämpfer und dgl. unterdrückt bzw. verhindert werden muss.When operating oscillating positive displacement pumps, it is desirable for fundamental considerations to achieve a largely constant flow rate. This is true even if only because otherwise adverse effects occur in the pressure or delivery line. These consist e.g. in that at each pressure stroke, a pressure pulsation arises in the delivery line, which can adversely affect the lines of the entire system and therefore by means of separate pulsation damper and the like. Must be suppressed or prevented.
Um daher einen weitgehend konstanten Förderstrom bei oszillierenden Verdrängerpumpen zu erreichen, ist es beispielsweise schon bekannt, Pumpen nicht als Einfachpumpen zu bauen, sondern mindestens als Dreifachpumpe mit gleichmäßgiem Exzenterversatz vorzusehen. Durch die Überlagerung der Förderströme nimmt mit zunehmender Zylinderzahl die Pulsation des Förderstromes ab. Dies ist für viele Fälle jedoch nicht ausreichend, so zusätzliche Maßnahmen zur Pulsationsdämpfung notwendig werden. Dies erfordert jedoch einen beträchtlichen konstruktiven Aufwand.Therefore, in order to achieve a substantially constant flow rate in oscillating displacement pumps, it is already known, for example Pumps not to build as a single pump, but at least provide a triple pump with gleichmäßgiem eccentric offset. Due to the superimposition of the flow rates, the pulsation of the flow decreases as the number of cylinders increases. However, this is not sufficient in many cases, so additional measures for pulsation damping are necessary. However, this requires a considerable design effort.
Außerdem ist es bekannt (
Der Erfindung liegt daher die Aufgabe zugrunde, das Verfahren der gattungsgemäßen Art zur Beseitigung der geschilderten Nachteile derart auszugestalten, dass es mittels einfacher konstruktiver Mittel bei vertretbarem wirtschaftlichem Aufwand die Erzielung eines weitgehend gleichmäßigen bzw. konstanten Förderstroms ermöglicht.The invention is therefore based on the object, the method of the generic type to eliminate the disadvantages described in such a way that it makes it possible to achieve a largely uniform or constant flow rate by means of simple constructive means with reasonable economic effort.
Außerdem soll eine Vorrichtung zur Durchführung dieses Verfahrens geschaffen werden, die einfach betreibbar ist.In addition, an apparatus for performing this method is to be created, which is easy to operate.
Diese Aufgabe wird mit dem Verfahren gemäß der Erfindung durch die Merkmale des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen hiervon sind in den weiteren Ansprüchen beschrieben.This object is achieved by the method according to the invention by the features of
Die Merkmale der erfindungsgemäß geschaffenen Vorrichtung ergeben sich aus Anspruch 6. Vorteilhafte Ausgestaltungen hiervon sind in den weiteren Ansprüchen aufgeführt.The features of the inventively created device will become apparent from
Dem erfindungsgemäßen Verfahren zur Vergleichmäßigung des Förderstroms bei oszillierenden Verdrängerpumpen liegt der wesentliche Gedanke zugrunde, dass die Erzeugung des Fluidstroms in einer Förderleitung mittels wenigstens zweier oszillierender Verdrängerpumpen erfolgt, deren Antriebsmotoren derart gesteuert werden, dass der insgesamt erzeugte Förderstrom in der Förderleitung weitgehend gleichmäßig bzw. konstant ist.The inventive method for equalizing the flow rate in oscillating displacement pumps is based on the essential idea that the generation of the fluid flow in a delivery line by means of at least two oscillating displacement, whose drive motors are controlled so that the total flow generated in the delivery line largely uniform or constant is.
Erfindungsgemäß ist weiterhin vorgesehen, dass die Verdrängerpumpen im Verbund miteinander ohne mechanische Kopplung betrieben werden.According to the invention, it is further provided that the displacement pumps are operated in a composite with each other without mechanical coupling.
Es liegt im Rahmen der Erfindung, dass die Verdrängerpumpen derart elektronisch synchronisiert betrieben werden, dass ein nahezu pulsationsfreier gleichförmiger Förderstrom (Volumenstrom) in der gemeinsamen Förderleitung erzeugt wird.It is within the scope of the invention that the positive displacement pumps are operated synchronized electronically such that a virtually pulsation-free uniform flow rate (volume flow) is generated in the common delivery line.
Zweckmäßigerweise kann das erfindungsgemäße Verfahren derart betrieben werden, dass der Antriebsmotor jeder Verdrängerpumpe in seiner Drehzahl derart verändert wird, dass die überlagerten Förderströme der Verdrängerpumpen einen weitgehend konstanten Summenförderstrom ergeben.Appropriately, the inventive method can be operated such that the drive motor of each positive displacement pump is changed in its rotational speed such that the superimposed flow rates of the positive displacement pumps give a substantially constant total flow.
Besondere Vorteile ergeben sich, wenn die Welle des Antriebsmotors jeder Verdrängerpumpe zum Erreichen der Konstantcharakteristik des Summenförderstroms eine angepasste Drehbewegung ausführt.Particular advantages arise when the shaft of the drive motor of each positive displacement pump to achieve the constant characteristic of the cumulative flow performs an adapted rotational movement.
Die erfindungsgemäße Vorrichtung zur Durchführung des vorerwähnten Verfahrens ist versehen mit wenigstens zwei oszillierenden Verdrängerpumpen, deren Druckleitung zum Überlagern der einzelnen Förderströme an eine gemeinsame Förderleitung angeschlossen ist und die jeweils einen Antriebsmotor aufweisen, die ohne mechanische Kopplung in elektronischer Synchronisation zum Erzielen eines weitgehend gleichmäßigen bzw. konstanten Summenförderstroms betreibbar sind.The device according to the invention for carrying out the above-mentioned method is provided with at least two oscillating displacement pumps whose pressure line for superimposing the individual Delivery streams is connected to a common delivery line and each having a drive motor, which are operable without mechanical coupling in electronic synchronization to achieve a substantially uniform or constant sum flow.
Vorteilhafter Weise ist der Antrieb jeder Verdrängungspumpe ein hochdynamischer Antrieb. Dies kann ein Servomotor, vorzugsweise ein permanenterregter Drehstrom-Synchronservomotor sein.Advantageously, the drive of each displacement pump is a highly dynamic drive. This may be a servo motor, preferably a permanent-magnet three-phase synchronous servo motor.
Es liegt im Rahmen der Erfindung, dass die Verdrängerpumpen Membranpumpen sind.It is within the scope of the invention that the displacement pumps are diaphragm pumps.
Mit der Erfindung ist es somit möglich, aufgrund der gezielt durchgeführten Überlagerung der Förderströme zweier Einzelpumpen die Druckpulsation in der gemeinsamen Förderleitung auch ohne Pulsationsdämpfer zu verhindern und gleichzeitig einen weitgehend konstanten Förderstrom zu erreichen. Dies erfolgt durch exakte elektronische Synchronisation der mechanisch nicht gekoppelten Verdrängerpumpen.With the invention, it is thus possible to prevent the pressure pulsation in the common delivery line without pulsation damper and at the same time to achieve a substantially constant flow rate due to the deliberately carried out superimposition of the flow rates of two individual pumps. This is done by exact electronic synchronization of the mechanically uncoupled positive displacement pump.
Um schließlich zu kontrollieren, ob die erwünschte Konstantcharakteristik des Förderstroms erreicht wird, sind schon verschiedene Verfahren bekannt (
Die Erfindung wird im Folgenden in Form eines Ausführungsbeispiels anhand der Zeichnung näher erläutert. Diese zeigt in:
- Fig. 1
- schematisch die Anordnung von zwei mechanisch nicht gekoppelten oszillierenden Verdrängerpumpen zur Vergleichmäßigung des Gesamtförderstroms;
- Fig. 2 a-d
- verschiedene Diagramme von Pumpenmesswerten, aufgetragen über der Zeit t, zur Verdeutlichung der Erzielung einer konstanten Fluidgeschwindigkeit und damit eines gleichmäßigen Förderstroms, bei einem Fördergrad der Pumpen von insgesamt 100%, sowie
- Fig. 3 a-c
- verschiedene Diagramme von entsprechenden Pumpenmesswerten, aufgetragen über der Zeit t, bei einem reduzierten Pumpenfördergrad von ca. 90%.
- Fig. 1
- schematically the arrangement of two mechanically uncoupled oscillating displacement pumps for Equalization of the total production flow;
- Fig. 2 ad
- various diagrams of pump readings, plotted against time t, to illustrate the achievement of a constant fluid velocity and thus a uniform flow rate, with a pump delivery of 100%, as well as
- Fig. 3 ac
- various diagrams of corresponding pump readings, plotted over time t, with a reduced pumping rate of about 90%.
Wie aus
Die mechanisch nicht gekoppelten Membranpumpen 1, 2 weisen jeweils einen Antriebsmotor 6 bzw. 7 auf, der als hochdynamischer Antrieb ausgestaltet ist. Dies ist vorzugsweise ein Servomotor, und zwar insbesondere ein permanenterregter Drehstrom-Synchronservomotor.The mechanically
Die Antriebsmotoren 6, 7 der beiden Membranpumpen 1, 2 werden durch exakte elektronische Synchronisation derart betrieben, dass ein weitgehend gleichmäßiger bzw. konstanter Summenförderstrom in der gemeinsamen Förderleitung 5 erreichbar ist.The
Diese mit dem erfindungsgemäßen Verfahren betriebene Vorgehensweise ist durch die einzelnen Diagramme in
Diagramm 2a zeigt den Verlauf des Kolbenwegs über der Zeit t bei beiden Membranpumpen 1, 2. Da dies - im Unterschied zum Stand der Technik - aufgrund des speziellen Betriebs der Antriebsmotoren 6, 7 der beiden Membranpumpen 1, 2 ein konstanter Verlauf ist, ergibt sich auch, wie aus
Dies wird nicht zuletzt dadurch bewirkt, dass die Winkelgeschwindigkeit der Exzenterwellen der jeweiligen Membranpumpen 1, 2, aufgetragen über der Zeit t, den Verlauf gemäß
Schließlich zeigt das Diagramm gemäß
Die Diagramme gemäß
Falls dieser Wertverlust gleichwohl ausgeglichen werden soll, ergibt sich dann eine Darstellung der Fluidgeschwindigkeit über der Zeit t gemäß
Wie hierzu aus
Zum Verständnis des Begriffes des "toten Kompressionsweges hK" wird von der bekannten Tatsache ausgegangen, dass jede oszillierende Verdrängerpumpe einen Förderzyklus aufweist. Dieser besteht
- aus einer Ansaugphase, in der das Fluid in eine Pumpenkammer angesaugt wird,
- einer Kompressionsphase, in der das angesaugte Fluid auf Förderdruck gebracht wird,
- einer Förderphase, in der ein Teil des komprimierten Fluids aus der Pumpenkammer ausgestoßen wird, und
- schließlich einer Dekompressions- bzw. Expansionsphase, in der das in der Pumpenkammer verbliebene Fluid wieder auf Ansaugdruck gebracht wird. Hierbei benötigt jede oszillierende Verdrängerpumpe für die Kompression des Fluids vom Saugdruck auf den Förderdruck einen bestimmten geringen Kolbenweg, den sog. toten Kompressionsweg hK, der in der Kompressionszeit zurückgelegt wird.
- from a suction phase, in which the fluid is sucked into a pump chamber,
- a compression phase in which the sucked fluid is brought to delivery pressure,
- a delivery phase in which a portion of the compressed fluid is expelled from the pumping chamber, and
- finally, a decompression or expansion phase in which the fluid remaining in the pump chamber is returned to suction pressure. In this case, each oscillating positive displacement pump for the compression of the fluid from the suction pressure to the delivery pressure requires a certain small piston travel, the so-called dead compression travel hK, which is covered in the compression time.
Hinsichtlich vorstehend nicht im Einzelnen erläuterter Merkmale wird abschließend ausdrücklich auf die Ansprüche sowie die Zeichnung verwiesen.With regard to features not explained in detail above, reference is expressly made expressly to the claims and the drawings.
Claims (8)
dadurch gekennzeichnet,
dass die Erzeugung des Fluidförderstroms in einer Förderleitung (5) mittels wenigstens zweier oszillierender Verdrängerpumpen (1, 2) erfolgt, deren Antriebsmotoren (6, 7) derart gesteuert werden, dass der insgesamt erzeugte Förderstrom in der Förderleitung (5) weitgehend gleichmäßig bzw. konstant ist.Method for equalizing the delivery flow in the case of oscillating displacement pumps whose drive is effected by means of a drive motor via a rotating shaft,
characterized,
in that the generation of the fluid delivery flow in a delivery line (5) takes place by means of at least two oscillating positive displacement pumps (1, 2) whose drive motors (6, 7) are controlled in such a way that the total generated flow in the delivery line (5) is substantially uniform or constant is.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009020414A DE102009020414A1 (en) | 2009-05-08 | 2009-05-08 | Homogenization of the flow rate in oscillating positive displacement pumps |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2249033A2 true EP2249033A2 (en) | 2010-11-10 |
EP2249033A3 EP2249033A3 (en) | 2011-11-02 |
EP2249033B1 EP2249033B1 (en) | 2014-11-12 |
Family
ID=42278269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP10004530.1A Active EP2249033B1 (en) | 2009-05-08 | 2010-04-29 | Equalization of the supply flow of oscillating pressure pumps |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100284827A1 (en) |
EP (1) | EP2249033B1 (en) |
JP (1) | JP5567385B2 (en) |
DE (1) | DE102009020414A1 (en) |
ES (1) | ES2529678T3 (en) |
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JP6570846B2 (en) * | 2015-03-09 | 2019-09-04 | アコマ医科工業株式会社 | Metering pump driving method, metering pump driving device, vaporizer and anesthesia device |
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US6997683B2 (en) * | 2003-01-10 | 2006-02-14 | Teledyne Isco, Inc. | High pressure reciprocating pump and control of the same |
-
2009
- 2009-05-08 DE DE102009020414A patent/DE102009020414A1/en not_active Ceased
-
2010
- 2010-04-29 EP EP10004530.1A patent/EP2249033B1/en active Active
- 2010-04-29 ES ES10004530.1T patent/ES2529678T3/en active Active
- 2010-05-06 US US12/775,191 patent/US20100284827A1/en not_active Abandoned
- 2010-05-10 JP JP2010107949A patent/JP5567385B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3546189C2 (en) | 1985-12-27 | 1990-01-04 | Lewa Herbert Ott Gmbh + Co, 7250 Leonberg, De | |
DE19849785C1 (en) | 1998-10-28 | 2000-03-16 | Ott Kg Lewa | Method and device for adjusting feed in oscillating positive-displacement pumps driven by means of driving motor using a rotating shaft and a driving mechanism such as crank gearing, gives versatility in operation |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2949931A1 (en) * | 2014-05-30 | 2015-12-02 | LEWA GmbH | Pulsator |
RU2761258C1 (en) * | 2020-06-30 | 2021-12-06 | Публичное акционерное общество "ОДК-Уфимское моторостроительное производственное объединение" (ПАО "ОДК-УМПО") | Load balancing device |
Also Published As
Publication number | Publication date |
---|---|
EP2249033A3 (en) | 2011-11-02 |
DE102009020414A1 (en) | 2010-11-11 |
JP2010261461A (en) | 2010-11-18 |
US20100284827A1 (en) | 2010-11-11 |
EP2249033B1 (en) | 2014-11-12 |
JP5567385B2 (en) | 2014-08-06 |
ES2529678T3 (en) | 2015-02-24 |
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