EP1477673B1 - Leak detection in hydraulically driven membrane pump - Google Patents

Leak detection in hydraulically driven membrane pump Download PDF

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Publication number
EP1477673B1
EP1477673B1 EP04011110A EP04011110A EP1477673B1 EP 1477673 B1 EP1477673 B1 EP 1477673B1 EP 04011110 A EP04011110 A EP 04011110A EP 04011110 A EP04011110 A EP 04011110A EP 1477673 B1 EP1477673 B1 EP 1477673B1
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Prior art keywords
pump
value
pressure
time
monitoring
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German (de)
French (fr)
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EP1477673A2 (en
EP1477673A3 (en
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Michael Stritzelberger
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Lewa GmbH
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Lewa GmbH
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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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • F04B43/009—Special features systems, control, safety measures leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid

Definitions

  • the invention relates to a method for monitoring the leaks in the hydraulic pressure chamber of a diaphragm pump according to the preamble of claim 1.
  • the piston seal is not liquid-tight even when new.
  • the hydraulic fluid and the operating parameters, such as pressure, temperature, etc. during operation, a certain leakage, which then replenished in the dead center of the piston, ie at the end of the suction stroke, through the leak-relief valve becomes.
  • the invention is therefore based on the object to eliminate the disadvantages described to provide a method of the generic type, by means of which it is possible to detect leaking increases in the hydraulic pressure chamber of the diaphragm pump in time, so that any required business interruption can be planned in a timely manner.
  • the invention is based on the essential idea that the time or the crank angle is monitored, at which the sniffing process, which begins at the end of the suction stroke, is initiated. At a predetermined change in the time or in the crank angle, this is then displayed.
  • the point in time at which the sniffer operation serving to supplement the leak is continuously monitored and compared with a reference value, wherein a predetermined deviation between the two values triggers a leakage indication.
  • crank angle of the pump engine can be monitored to monitor the start of the sniffing process.
  • the beginning and end of the sniffing process are detected by monitoring an absolute pressure value in the hydraulic chamber.
  • the time of the beginning of the sniffing process with a reduction in the pressure in the intake stroke to the set pressure of the leak-relief valve noticeable.
  • the resulting snoop window i.
  • the period between the beginning and end of the sniffing process very narrow, but with increasing leakage in the hydraulic pressure chamber due to defective component components significantly wider, i. longer in time.
  • the beginning and end of the sniffing process can be detected only for the sake of example by monitoring absolute pressure values.
  • absolute pressure values 1.5 bar are used. If this value is undershot, this is a sign for the beginning of the snooping process. If this value is then exceeded again, the snooping process is completed.
  • the absolute pressure value at which the sniffing process starts depends on the design of the diaphragm pump and can also assume values below 1 bar absolute.
  • the beginning and end of the sniffing process are expressed in very steep pressure drops or pressure increases.
  • the procedure according to the invention is such that the pressure is monitored for strong pressure changes.
  • the pressure is monitored for strong pressure changes.
  • Another design option is that no fixed limit of eg 1.5 bar is specified, but that the pressure value is determined by the beginning of the suction stroke in the time window t 4 -t 5 (s. Fig. 2a ) the detected pressure value is averaged and serves as a reference. The limit value can then result from the pressure value p45 less a differential pressure of, for example, 0.2 bar to be determined.
  • Fig. 1 shows in section a conventional diaphragm pump, to the detailed description, because, for example, from DE 101 43 978 A1 known, can be dispensed with. In the present case, however, it is a matter of monitoring the leakages occurring in the hydraulic pressure chamber 1 of the pump by continuously monitoring and comparing the time at which the sniffering operation is applied to a reference value, a predetermined deviation between the two Values triggers a leak indication.
  • Such leakages can, as mentioned, occur at the piston seal 2 or at the pressure relief valve 3 and also - not shown - leak-relief valve.
  • Fig. 2a the typical pressure curve in the hydraulic pressure chamber 1 during a stroke cycle of the diaphragm metering pump is shown. It turns out that at the end of the suction stroke, when the pump piston 4 is at the rear dead center, the actual sniffing process begins, which serves to supplement the leak in the hydraulic pressure chamber 1. In this case, when the pump is intact, the sniffing process begins at time t 1 and ends at time t 2 .
  • the method 3.) or the combination of 1.) and 3.) is particularly advantageous to use in changing operating conditions, since the duration of the sniffing process can change in practical operation without a fault exists.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Überwachung der Leckagen im Hydraulikdruckraum einer Membranpumpe gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method for monitoring the leaks in the hydraulic pressure chamber of a diaphragm pump according to the preamble of claim 1.

Die ordnungsgemäße Funktion aller Komponenten und Bauteile im Hydraulikdruckraum einer, insbesondere hydraulisch angetriebenen, Membranpumpe hat entscheidenden Einfluß auf die Leistung sowie auf die Dosiergenauigkeit einer solchen Pumpe.The proper functioning of all components and components in the hydraulic pressure chamber of a, in particular hydraulically driven, diaphragm pump has a decisive influence on the performance and on the dosing accuracy of such a pump.

Übliche Bauteile der Membranpumpe, wie das Leckergänzungsventil sowie das Druckbegrenzungsventil, sind im Neuzustand flüssigkeitsdicht und weisen keine Leckage auf.Conventional components of the diaphragm pump, such as the leak-relief valve and the pressure-limiting valve, are liquid-tight when new and have no leakage.

Demgegenüber ist die Kolbenabdichtung auch im Neuzustand nicht flüssigkeitsdicht. So ergibt sich stets in Abhängigkeit von der Ausführung der Abdichtung, dem Hydraulikfluid und den Betriebsparametern, wie Druck, Temperatur usw., im Betrieb eine bestimmte Leckage, die dann im hinteren Totpunkt des Kolbens, d.h. am Ende des Saughubes, durch das Leckergänzungsventil wieder aufgefüllt wird.In contrast, the piston seal is not liquid-tight even when new. Thus, depending on the design of the seal, the hydraulic fluid and the operating parameters, such as pressure, temperature, etc., during operation, a certain leakage, which then replenished in the dead center of the piston, ie at the end of the suction stroke, through the leak-relief valve becomes.

Auch wenn üblicherweise an der Membranpumpe ein Gasaustragsventil eingebaut ist, ergibt sich an diesem Ventil eine bestimmte Leckage.Even if a gas discharge valve is usually installed on the diaphragm pump, this valve results in a specific leakage.

Darüber hinaus sind sämtliche der erwähnten Bauteile der Membranpumpe im Betrieb einem gewissen Verschleiß unterworfen. Dieser macht sich gleichfalls durch eine erhöhte Leckage bemerkbar, die sich nachteilig auf die Förderleistung sowie auf die Dosiergenauigkeit auswirkt.In addition, all of the mentioned components of the diaphragm pump are subjected during operation to a certain wear. This is also noticeable by an increased leakage, which has a detrimental effect on the flow rate and on the dosing accuracy.

Auch kann es durch den Ausfall einer Dichtung, insbesondere im Bereich des Pumpenkolbens, zu einer unerwünschten Leckageerhöhung kommen.Also, it can lead to an undesirable increase in leakage due to the failure of a seal, in particular in the region of the pump piston.

In der Praxis wurde bisher versucht, diesem Problem dadurch zu begegnen, daß man aus der Erfahrung heraus die betreffenden Bauteile, die dem vorhersehbaren Verschleiß unterliegen, rechtzeitig austauscht. Trotzdem kommt es relativ häufig vor, daß Bauteile vorzeitig ausfallen und somit aufgrund der dann erforderlichen Betriebsunterbrechung unerwünschte Folgeschäden verursachen.In practice, attempts have been made to date to counteract this problem by exchanging in good time the components in question that are subject to predictable wear. Nevertheless, it is relatively common that components fail prematurely and thus cause unwanted consequential damage due to the then necessary business interruption.

Um eine auftretende Leckage im Hydraulikdruckraum der Membranpumpe festzustellen, wurde bisher versucht, dies über den auftretenden Leistungsmangel der Pumpe oder mittels Temperaturmessung rechtzeitig in Kenntnis zu bringen. Diese Verfahren haben sich jedoch nicht bewährt, da sie entweder mit zu großem konstruktivem Aufwand verbunden sind oder nicht die gewünschten Ergebnisse erbringen.In order to detect an occurring leakage in the hydraulic pressure chamber of the diaphragm pump, it has been attempted to bring this in advance on the occurring power shortage of the pump or by means of temperature measurement in knowledge. However, these methods have not been successful because they are either associated with too much design effort or do not provide the desired results.

Um das Volumen des Hydraulikdruckraumes einer Membranpumpe zu kontrollieren, ist es außerdem bekannt ( DE 198 26 610 A1 ), im Hydraulikdruckraum einen Drucksensor anzuordnen; dieser ist mit einer Auswerteeinheit verbunden, die zur Erzeugung eines Nachfüllsignals ausgebildet ist, das mittels einer Wirkverbindung eine Nachfülleinheit betätigt. Der im Hydraulikdruckraum angeordnete Drucksensor meldet das Entstehen des Unterdruckes während des Ansaughubes an die Auswerteeinheit. Dort wird dieses Signal mit einem vorgegebenen Grenzwert verglichen. Sobald der vorgegebene Grenzwert überschritten wird, erzeugt die Auswerteeinheit ein Signal, das die Nachfüllung des Hydraulikdruckraums mit Hydraulikfluid bewirkt. Durch einen Zähler in der Auswerteeinheit wird das Bewirken des Nachfüllvorganges protokolliert und die Häufigkeit der Leckergänzung ermittelt.In order to control the volume of the hydraulic pressure chamber of a diaphragm pump, it is also known ( DE 198 26 610 A1 ) to arrange a pressure sensor in the hydraulic pressure chamber; this is connected to an evaluation unit, which is designed to generate a refill signal, which actuates a refill unit by means of an operative connection. The arranged in the hydraulic pressure chamber pressure sensor reports the emergence of the negative pressure during the intake stroke to the evaluation unit. There, this signal is compared with a predetermined limit. As soon as the predetermined limit value is exceeded, the evaluation unit generates a signal that the refilling of the hydraulic pressure chamber with Hydraulic fluid causes. By means of a counter in the evaluation unit, the effecting of the refilling process is recorded and the frequency of the leak suppression determined.

Jedoch genügt auch diese bekannte Vorrichtung nicht in zufriedenstellendem Ausmaß den heute an die Membranpumpen der gattungsgemäßen Art gestellten Anforderungen, die vor allen Dingen mit einfachen konstruktiven Mitteln, mit großer Sicherheit sowie in kürzester Zeit erfüllt werden müssen.However, even this known device does not satisfy to a satisfactory extent today the demands made on the diaphragm pumps of the generic type, which must be fulfilled above all with simple structural means, with great certainty and in the shortest possible time.

Der Erfindung liegt daher die Aufgabe zugrunde, zur Beseitigung der geschilderten Nachteile ein Verfahren der gattungsgemäßen Art zu schaffen, mittels dem es möglich ist, Leckageerhöhungen im Hydraulikdruckraum der Membranpumpe rechtzeitig zu erkennen, so daß eine etwa erforderliche Betriebsunterbrechung rechtzeitig geplant werden kann.The invention is therefore based on the object to eliminate the disadvantages described to provide a method of the generic type, by means of which it is possible to detect leaking increases in the hydraulic pressure chamber of the diaphragm pump in time, so that any required business interruption can be planned in a timely manner.

Die Merkmale des zur Lösung dieser Aufgabe geschaffenen Verfahrens gemäß der Erfindung ergeben sich aus Anspruch 1. Vorteilhafte Ausgestaltungen hiervon sind in den weiteren Ansprüchen beschrieben.The features of the method for solving this problem according to the invention will become apparent from claim 1. Advantageous embodiments thereof are described in the further claims.

Der Erfindung liegt der wesentliche Gedanke zugrunde, daß der Zeitpunkt bzw. der Kurbelwinkel überwacht wird, an dem der Schnüffelvorgang, der am Ende des Saughubes einsetzt, eingeleitet wird. Bei einer vorbestimmten Veränderung im Zeitpunkt bzw. im Kurbelwinkel wird dies sodann zur Anzeige gebracht.The invention is based on the essential idea that the time or the crank angle is monitored, at which the sniffing process, which begins at the end of the suction stroke, is initiated. At a predetermined change in the time or in the crank angle, this is then displayed.

Bei dem erfindungsgemäßen Verfahren ist somit im einzelnen vorgesehen, daß der Zeitpunkt, zu dem der einer Leckergänzung dienende Schnüffelvorgang eingeleitet wird, kontinuierlich überwacht und mit einem Referenzwert verglichen wird, wobei eine vorbestimmte Abweichung zwischen beiden Werten eine Leckageanzeige auslöst.In the method according to the invention, it is thus provided in detail that the point in time at which the sniffer operation serving to supplement the leak is continuously monitored and compared with a reference value, wherein a predetermined deviation between the two values triggers a leakage indication.

In erfindungsgemäßer Ausgestaltung kann zur Überwachung des zeitlichen Beginns des Schnüffelvorgangs der Kurbelwinkel des Pumpentriebwerkes überwacht werden.In an embodiment according to the invention, the crank angle of the pump engine can be monitored to monitor the start of the sniffing process.

Vorteilhafterweise werden Beginn und Ende des Schnüffelvorgangs durch Überwachung eines absoluten Druckwertes im Hydraulikraum erfaßt.Advantageously, the beginning and end of the sniffing process are detected by monitoring an absolute pressure value in the hydraulic chamber.

Besonders deutliche Ergebnisse lassen sich dann erzielen, wenn der absolute Druckwert auf die Änderung seines Druckgradienten überwacht wird. Hierbei liegt es im Rahmen der Erfindung, daß die Änderung des Druckgradienten pro Zeiteinheit bzw. pro Kurbelwinkelgrad erfaßt und daß eine Leckageanzeige erst bei Überschreiten eines vorbestimmten Wertes ausgelöst wird.Particularly significant results can be achieved if the absolute pressure value is monitored for the change in its pressure gradient. It is within the scope of the invention that detects the change in the pressure gradient per unit time or per crank angle degree and that a leakage indicator is triggered only when a predetermined value is exceeded.

Wie bekannt, macht sich der Zeitpunkt des Beginns des Schnüffelvorganges mit einer Absenkung des Druckes im Saughub auf den Einstelldruck des Leckergänzungsventiles bemerkbar. Hierbei ist bei intakter Pumpe das sich ergebende Schnüffelfenster, d.h. der Zeitraum zwischen Beginn und Ende des Schnüffelvorgangs, sehr schmal, wird jedoch mit zunehmender Leckage im Hydraulikdruckraum aufgrund defekter Bauteilkomponenten signifikant breiter, d.h. zeitlich länger.As is known, the time of the beginning of the sniffing process with a reduction in the pressure in the intake stroke to the set pressure of the leak-relief valve noticeable. With an intact pump, the resulting snoop window, i. However, the period between the beginning and end of the sniffing process, very narrow, but with increasing leakage in the hydraulic pressure chamber due to defective component components significantly wider, i. longer in time.

Beginn und Ende des Schnüffelvorganges können lediglich des Beispiels halber dadurch erfaßt werden, daß absolute Druckwerte überwacht werden. Zu diesem Zweck werden z.B. absolute Druckwerte von 1,5 bar verwendet. Wird dieser Wert unterschritten, ist dies ein Zeichen für den Beginn des Schnüffelvorganges. Wird dann dieser Wert wieder überschritten, ist der Schnüffelvorgang beendet.The beginning and end of the sniffing process can be detected only for the sake of example by monitoring absolute pressure values. To this For example, absolute pressure values of 1.5 bar are used. If this value is undershot, this is a sign for the beginning of the snooping process. If this value is then exceeded again, the snooping process is completed.

Der absolute Druckwert, bei dem der Schnüffelvorgang beginnt, ist abhängig von der Konstruktion der Membranpumpe und kann auch Werte unter 1 bar absolut annehmen.The absolute pressure value at which the sniffing process starts depends on the design of the diaphragm pump and can also assume values below 1 bar absolute.

Beginn und Ende des Schnüffelvorganges äußern sich in sehr steilen Druckabsenkungen bzw. Druckanstiegen. Hierbei kann, wie schon erwähnt, erfindungsgemäß derart vorgegangen werden, daß der Druck auf starke Druckänderungen hin überwacht wird. So ist es möglich, eine Absenkung des Druckes unter den Grenzwert von z.B. 1,5 bar nur dann als Beginn des Schnüffelvorganges zu werten, wenn gleichzeitig die Druckänderung pro Zeiteinheit bzw. pro Kurbelwinkelgrad einen bestimmten Wert überschreitet. Dies löst dann die Leckageanzeige aus.The beginning and end of the sniffing process are expressed in very steep pressure drops or pressure increases. Here, as already mentioned, the procedure according to the invention is such that the pressure is monitored for strong pressure changes. Thus, it is possible to lower the pressure below the threshold of e.g. 1.5 bar only to evaluate as the beginning of the sniffing process, if at the same time the pressure change per unit time or per crank angle degree exceeds a certain value. This will trigger the leak indicator.

Eine weitere Ausgestaltungsmöglichkeit besteht darin, daß kein fester Grenzwert von z.B. 1,5 bar vorgegeben wird, sondern daß der Druckwert ermittelt wird, indem zu Beginn des Saughubes im Zeitfenster t4-t5 (s. Fig. 2a) der erfaßte Druckwert gemittelt wird und als Referenz dient. Der Grenzwert kann sich dann aus dem Druckwert p45 abzüglich eines festzulegenden Differenzdruckes von z.B. 0,2 bar ergeben.Another design option is that no fixed limit of eg 1.5 bar is specified, but that the pressure value is determined by the beginning of the suction stroke in the time window t 4 -t 5 (s. Fig. 2a ) the detected pressure value is averaged and serves as a reference. The limit value can then result from the pressure value p45 less a differential pressure of, for example, 0.2 bar to be determined.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert. Diese zeigt in:

Fig. 1
schematisch im Schnitt eine Membranpumpe, bei deren Hydraulikdruckraum das erfindungsgemäße Verfahren zur Überwachung der auftretenden Leckagen zur Anwendung gelangt;
Fig. 2a
im Diagramm den Druckverlauf über der Zeit während des Druckhubes und des Saughubes der Pumpe mit einem zeitlichen Verlauf des Schnüffelfensters bei intakter Pumpe und
Fig. 2b
mit einem zeitlichen Verlauf des Schnüffelfensters bei erhöhter Hydraulikleckage.
The invention will be explained in more detail below with reference to the drawing. This shows in:
Fig. 1
schematically in section a diaphragm pump, in the hydraulic pressure chamber, the inventive method for monitoring the leakages occurring comes to the application;
Fig. 2a
in the diagram, the pressure curve over time during the pressure stroke and the suction stroke of the pump with a time course of the snoop window with intact pump and
Fig. 2b
with a time course of the snoop window with increased hydraulic leakage.

Fig. 1 zeigt im Schnitt eine übliche Membranpumpe, auf deren nähere Beschreibung, weil beispielsweise aus DE 101 43 978 A1 bekannt, verzichtet werden kann. Im vorliegenden Fall handelt es sich jedoch darum, die im Hydraulikdruckraum 1 der Pumpe auftretenden Leckagen dadurch zu überwachen, daß der Zeitpunkt, zu dem der einer Leckergänzung dienende Schnüffelvorgang eingeleitet wird, kontinuierlich überwacht und mit einem Referenzwert verglichen wird, wobei eine vorbestimmte Abweichung zwischen beiden Werten eine Leckageanzeige auslöst. Fig. 1 shows in section a conventional diaphragm pump, to the detailed description, because, for example, from DE 101 43 978 A1 known, can be dispensed with. In the present case, however, it is a matter of monitoring the leakages occurring in the hydraulic pressure chamber 1 of the pump by continuously monitoring and comparing the time at which the sniffering operation is applied to a reference value, a predetermined deviation between the two Values triggers a leak indication.

Derartige Leckagen können, wie erwähnt, an der Kolbenabdichtung 2 auftreten oder aber beim Druckbegrenzungsventil 3 sowie auch beim - nicht näher dargestellten - Leckergänzungsventil.Such leakages can, as mentioned, occur at the piston seal 2 or at the pressure relief valve 3 and also - not shown - leak-relief valve.

In Fig. 2a ist der typische Druckverlauf im Hydraulikdruckraum 1 während eines Hubzyklus der Membrandosierpumpe dargestellt. Hierbei zeigt sich, daß am Ende des Saughubes, wenn sich der Pumpenkolben 4 im hinteren Totpunkt befindet, der eigentliche Schnüffelvorgang beginnt, welcher der Leckergänzung im Hydraulikdruckraum 1 dient. Hierbei beginnt bei intakter Pumpe der Schnüffelvorgang zum Zeitpunkt t1 und endet zum Zeitpunkt t2.In Fig. 2a the typical pressure curve in the hydraulic pressure chamber 1 during a stroke cycle of the diaphragm metering pump is shown. It turns out that at the end of the suction stroke, when the pump piston 4 is at the rear dead center, the actual sniffing process begins, which serves to supplement the leak in the hydraulic pressure chamber 1. In this case, when the pump is intact, the sniffing process begins at time t 1 and ends at time t 2 .

Wenn demgegenüber im Hydraulikdruckraum 1 eine erhöhte Hydraulikleckage auftritt bzw. aufgetreten ist, beginnt der Schnüffelvorgang, wie in Fig. 2b dargestellt, bereits zum Zeitpunkt t3. Dieser vom Wert t1 abweichende Wert t3 löst dann eine Leckageanzeige aus, wenn die Abweichung zwischen beiden Werten einen vorbestimmten Wert überschreitet.On the other hand, when an increased hydraulic leak occurs or has occurred in the hydraulic pressure space 1, the snooping operation starts, as in FIG Fig. 2b shown, already at time t 3 . This value t 3 , which deviates from the value t 1 , then triggers a leakage display if the deviation between the two values exceeds a predetermined value.

Der Zeitpunkt t1 kann auf unterschiedliche Weise vorgegeben und erfaßt werden.

  1. 1.) durch eine Referenzmessung an der intakten Pumpe
  2. 2.) durch eine Auswahl aus vordefinierten Werten, z.B. aus einer Matrix mit definierten Werten für unterschiedliche Pumpenausführungen und Betriebsbedingungen,
  3. 3.) durch eine rechnerische Ermittlung aus Pumpen- und Betriebsdaten, wie Förderdruck, Pumpendrehzahl, Hydraulikfluidart und -temperatur. Dazu kann es vorteilhaft sein, den Betriebsdruck, die Pumpendrehzahl und die Temperatur des Hydraulikfluids kontinuierlich zu erfassen.
The time t 1 can be set and detected in different ways.
  1. 1.) by a reference measurement on the intact pump
  2. 2.) by a selection of predefined values, eg from a matrix with defined values for different pump designs and operating conditions,
  3. 3.) by a mathematical determination of pump and operating data, such as delivery pressure, pump speed, Hydraulikfluidart and temperature. For this purpose, it may be advantageous to continuously record the operating pressure, the pump speed and the temperature of the hydraulic fluid.

Die Methoden gemäß Ziff. 1.) und 3.) lassen sich in vorteilhafter Weise kombinieren, indem ein Referenzwert im Betrieb ermittelt wird und Veränderungen rechnerisch bestimmt werden.The methods according to para. 1.) and 3.) can be combined in an advantageous manner by a reference value is determined during operation and changes are determined by calculation.

Die Methode 3.) bzw. die Kombination aus 1.) und 3.) ist besonders vorteilhaft bei wechselnden Betriebsverhältnissen anzuwenden, da sich die Zeitdauer des Schnüffelvorganges im praktischen Betrieb ändern kann, ohne daß eine Störung vorliegt.The method 3.) or the combination of 1.) and 3.) is particularly advantageous to use in changing operating conditions, since the duration of the sniffing process can change in practical operation without a fault exists.

Claims (5)

  1. Method for monitoring leakage in the hydraulic pressure chamber of a diaphragm pump, characterised in that the time point (t3) at which the snifting process, which serves for leakage compensation, is initiated is continuously monitored and compared with a reference value (t1), wherein a pre-determined deviation (Δt1-t3) between the two values (t3 and t1) triggers a leak indicator.
  2. Method according to claim 1, characterised in that, for monitoring the time of the start of the snifting process, the crank angle of the pump drive mechanism is monitored.
  3. Method according to claim 1, characterised in that the start (t1 or t3) and end (t2) of the snifting process are detected by monitoring an absolute pressure value in the hydraulic pressure chamber (1).
  4. Method according to claim 3, characterised in that the absolute pressure value is monitored for a change in the pressure gradient thereof.
  5. Method according to claim 4, characterised in that the change in the pressure gradient per time unit or per degree of the crank angle is detected and that a leak indicator is triggered only in the event that a pre-determined value is exceeded.
EP04011110A 2003-05-16 2004-05-10 Leak detection in hydraulically driven membrane pump Expired - Lifetime EP1477673B1 (en)

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Application Number Priority Date Filing Date Title
DE10322221 2003-05-16
DE10322221A DE10322221B3 (en) 2003-05-16 2003-05-16 Leakage monitoring in the hydraulic pressure chamber of a diaphragm pump

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EP1477673A2 EP1477673A2 (en) 2004-11-17
EP1477673A3 EP1477673A3 (en) 2006-09-13
EP1477673B1 true EP1477673B1 (en) 2009-08-19

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EP1477673A2 (en) 2004-11-17
DE10322221B3 (en) 2005-01-27
US20040226344A1 (en) 2004-11-18
DE502004009909D1 (en) 2009-10-01
EP1477673A3 (en) 2006-09-13
US7000455B2 (en) 2006-02-21

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