EP0943805B1 - Verfahren und Sensor zur Detektion von Kavitationen, sowie Vorrichtung enthaltend einen solchen Sensor - Google Patents
Verfahren und Sensor zur Detektion von Kavitationen, sowie Vorrichtung enthaltend einen solchen Sensor Download PDFInfo
- Publication number
- EP0943805B1 EP0943805B1 EP98810237A EP98810237A EP0943805B1 EP 0943805 B1 EP0943805 B1 EP 0943805B1 EP 98810237 A EP98810237 A EP 98810237A EP 98810237 A EP98810237 A EP 98810237A EP 0943805 B1 EP0943805 B1 EP 0943805B1
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- European Patent Office
- Prior art keywords
- sensor
- monitored
- pressure
- time interval
- space
- 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
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/28—Safety arrangements; Monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/78—Warnings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/80—Diagnostics
Definitions
- the invention relates to a method and a sensor for the detection of Cavitation according to the respective independent claim, and a device containing such a sensor.
- Cavitation is a sudden formation of cavities like this can occur, for example, when liquid ring vacuum pumps - these are pumps that look like a liquid Use auxiliary medium to create a vacuum - the previously evaporated Liquid condenses very quickly or even suddenly.
- Such a cavitation creates a mechanical fluid pump Impact or impact on the blade or blades of the impeller, between which the gas is located. This has one with every cavitation more or less minor injury to the blades resulting in time the paddle wheel and thus the pump becomes unusable.
- a method is already known from the published patent application DE 35 20 734 A. and a device for operating a centrifugal pump is known, wherein by means cavitation-free operation can be set for a probe.
- cavitation will damage the pump over time can, as already explained above, avoid such cavitations will be or at least be detected, so that appropriate measures can be taken (e.g. operating parameters can be changed), to prevent the constant occurrence of such cavitations.
- this task is solved by a procedure like this characterized by the features of the independent process claim is.
- the space to be monitored monitored using a teachable sensor. Doing this at least once (a saving can then take place) during a learning process for the duration of a first time interval produces a state in which in cavitation will definitely occur in the room to be monitored. To Completion of the first time interval will last for a second Time interval established a state in which to be monitored Hence no cavitation will occur. In each of the two Time intervals, the sensor learns which signals cavitation or which Signals correspond to non-cavitation in the room to be monitored.
- the sensor examines the im Operation in the signals to be monitored, whether Predefinable criteria that are derived from the learned signals for cavitation or Non-cavitation are derived, fulfilled and deciding on this basis, whether or not cavitation has occurred in the room to be monitored and generates a corresponding output signal.
- the sensor itself "learns" what is cavitation and what is not (In particular, of course, he also learns the operating noise without Know cavitations) and then decides after a learning phase whether Cavitations occur or not.
- the reliability is there extremely large.
- the corresponding pump can also be used on one Place where monitoring is not always possible. If the sensor detects that cavitation is occurring when the pump is operating, If necessary, he can trigger an alarm so that the operating personnel appropriate measures can take and damage the Buckets and thus the pump can be avoided.
- pressure sensors are in these days Different versions available and can directly Deliver an output signal that represents the pressure. Basically come but also other sensors, such as acoustic sensors, in Consideration.
- both the absolute pressure and the pressure change are monitored, especially of course both.
- This is particularly advantageous for the teach-in process because it then follows as follows can expire.
- the sensor for the first Triggered time interval when falling below or Reaching a predeterminable pressure at which the pressure to be monitored Cavitation definitely occur, the sensor for the first Triggered time interval.
- the sensor "learns" in this first time interval, what is a cavitation.
- the pump After the end of the first time interval, again generates an increase in pressure that is greater than or equal to a predeterminable one Minimum pressure rise, and the sensor will be on for the second time interval triggered as soon as the minimum pressure rise is reached or exceeded and a predeterminable pressure is reached or exceeded. The sensor Then “learns” in this second time interval what is a "non-cavitation”. After this learning phase, the pump can then be operated.
- the senor is used during the learning process triggered for the first time interval only when the further decrease of the Pressure is less than a predetermined threshold. So it’s waiting until the pressure drop is practically complete. After completing the first Time interval, the sensor is then triggered for the second time interval, if the increase in pressure is greater than a predetermined threshold. Since it is preferred to work with low vapor pressures, one is correspondingly large pressure increase the pressure almost immediately above the Vapor pressure (and there are no cavitations in any case).
- the sensor determines how high for different criteria Fulfillment of the respective criteria the probability is that a Cavitation has occurred, and then due to all Criteria and the associated probabilities the sensor decides whether or not cavitation has occurred and the corresponding Output signal generated.
- Such sensors typically set the Principles of "fuzzy logic”.
- the task is also solved by means of a teachable sensor. Doing so in the room to be monitored initially during a teach-in process a state is established for the duration of a first time interval in which Cavitation definitely occurs in the room to be monitored. In this first time interval, the sensor learns what cavitation is. To The first time interval is completed in the room to be monitored for the duration of a second time interval produces a state in which in in any case, no cavitation occurs in the room to be monitored. In During this second time interval, the sensor learns what "non-cavitation" is. The sensor now includes means that in each of the two time intervals Store signals which indicate the cavitations or the non-cavitations in correspond to the room to be monitored.
- the sensor also includes Means which occur during operation in the room to be monitored Signals then investigate whether predeterminable criteria that result from the learned signals for cavitation or non-cavitation are derived, are fulfilled as well as means that decide on this basis whether to monitoring room a cavitation has occurred or not and then generate a corresponding output signal.
- a pump can be monitored with high reliability, even if operating personnel cannot be on site at all times. If cavitations occur, an alarm may be triggered based on the sensor output signal so that the operating personnel can take measures that Prevent damage to the blades and thus the pump.
- the senor has means for Determination of the pressure in the room to be monitored, so it is as Pressure sensor trained.
- he has both funds for Determination of the pressure as well as the change in pressure in the monitoring room, especially of both, which is especially for the Teaching process can be an advantage. Doing so can change the pressure either by forming the difference between successive measured values of the absolute pressure can be determined, or it can be separate means be provided, the direct measurement of the pressure change enable.
- the sensor has means for triggering the trigger the sensor for the first time interval during the teach-in process, if in a greater pressure drop is generated in the room to be monitored as a predeterminable minimum pressure drop and if a predeterminable pressure is reached or fallen below, in which in the to be monitored Cavitation definitely occur.
- the sensor learns what cavitation is and stores it corresponding signals.
- the sensor comprises means that the Sensor after completion of the first time interval for the second time interval trigger as soon as a pressure rise is generated that is greater than or equal to a predeterminable minimum pressure rise and as soon as a predeterminable one Minimum pressure is reached or exceeded. The sensor learns in this Time interval, which is a non-cavitation and stores the corresponding one Signals off.
- the means for triggering cause the learning process triggering of the sensor for the first time interval when the further pressure drop is smaller than a predeterminable one Threshold. In other words, this means that a trigger for the first time interval occurs at a practically stable low pressure.
- the means for triggering the Sensor triggers the sensor for the second time interval when the pressure rises is greater than a predefinable threshold. Because preferably with low Steam pressure is worked, the pressure is accordingly large pressure increase practically immediately above the vapor pressure.
- the senor comprises means which determine for different criteria how high when the respective one is fulfilled Criterion the likelihood is that cavitation has occurred as well as funds that are based on all criteria and the associated probabilities decide whether cavitation has occurred or not and generate the corresponding output signal.
- Such sensors typically use the principles of "fuzzy logic”.
- the subject of the invention is a device in particular a liquid ring pump that has a corresponding sensor includes.
- Liquid ring pump 1 can be seen the intake manifold 10 and the location 11, on which a pressure transmitter of a cavitation sensor (not shown) can be arranged inside the intake manifold 10.
- An eccentrically arranged paddle wheel 12 can also be seen (dashed), with the help of which a gas to be pumped (e.g. air at a Vacuum pump) through the intake manifold 10 and the intake slot 100, the are connected to each other, but what in Fig. 1 from the drawing For reasons not recognizable, is sucked in.
- the direction in which that Gas is pumped is indicated by the arrows G. It is immediate obvious that the paddle wheel 12 is driven clockwise for this purpose must become what e.g.
- An outlet slot 130 can also be seen in FIG. 1 and an outlet port 13, which are also in communication with each other stand, but which is not visible in Fig. 1 for drawing reasons. Through the outlet slot 130, the pumped gas can again from the Pump are led out.
- Fig. 2 shows the embodiment of the liquid ring pump 1 according to Fig. 1, however, is in addition to the intake manifold 10, the sensor 2 for Detect cavitations.
- the ring liquid space R which is concentric to the Pump housing is arranged and shown with a hatched Liquid F is filled.
- this ring liquid space R that is Paddle wheel 12 arranged eccentrically.
- the suction slot 100 as well the outlet slot 130 are indicated in Fig. 2 for the mode of operation to better explain such a pump.
- Another is Opening O for the ring liquid F is indicated. Because it has to - like still will be explained - new liquid F is constantly fed and heated liquid F are discharged.
- Sensor 2 is provided for the detection of such cavitations.
- there it is a so-called “learnable” sensor. That means the Sensor 2 is first taught in a teach-in process, which is actually (in terms of signal) corresponds to cavitation, and what does not. To do this of course a condition can be made, in any case Cavitations occur. In this state, sensor 2 must "learn” what is a cavitation. The sensor 2 must also learn what is a "non-cavitation” so that he is able to prevent cavitation from others Distinguish between disturbing noises (such as flow noises, Engine noise, etc.). This is done in a teach-in process, as in following will be described with reference to FIG. 3.
- the triggering of the sensor 2 for the first time interval t1 in which the Sensor learns what a cavitation (signal-based) is, is now done in such a way that first wait until the pressure level is below the level LO and on the other hand until the further pressure drop is less than one predefinable threshold. If the further pressure drop is smaller than this Threshold (this is in the area of the "kink" at the bottom of the edge 31 the case, which is actually not a sharp kink, but a there is a short, fixed transition Waiting time or triggering can take place immediately.
- the pressure p (DC component) is approximately in the region 32, which runs horizontally in FIG. 3 constant and cavitation occurs in any case at this pressure level (Alternating component).
- store in sensor 2 during the first time interval t1 means provided the signals corresponding to the cavitations. at these signals are the alternating component of the pressure (in FIG. 3 not shown), for a definable number of time windows, all lie within the first time interval t1, recorded and is saved.
- FIG. 4 shows the same signal curve as in FIG. 3, but here an operating state of the pump has been assumed.
- the triggering of sensor 2 takes place in operation only when the Pressure level (DC component) is below the LO level. this is a necessary - but not sufficient - condition for the occurrence of Cavitations. If the sensor is triggered during operation, there is a Monitoring with the help of sensor 2 until the time interval t3 Pressure level (DC component) is again above LO. Is this the If so, no cavitation and monitoring can occur through the sensor is reset until the level of pressure (DC component) falls below LO again.
- DC component Pressure level
- Fig. 5 shows a block diagram of a signal generating unit 21 of the Sensor 2.
- the transmitter 210 is separated there delivered signal in a switch ("Switch") 211.
- the two Output signal branches for absolute pressure detection 212 and for cavitation detection ("Cavitation Detection") 213 follow the outputs of the switch 211.
- the absolute pressure detection 212 the Constant component of the pressure is taken into account during the cavitation detection 213 the alternating component of the pressure is taken into account, for example in the already mentioned frequency range of 500-4000 Hz.
- such a device is particularly suitable for the Use as a vacuum pump.
- the quality of the achievable vacuum is thereby determined by the vapor pressure of the liquid F in the liquid annulus F.
- the device it is also suitable for applications where the monitoring room there is a risk of explosion.
- the sensor be designed so that the pressure transmitter in the hazardous area is located, but the rest of the sensor outside the hazardous area. Especially for use in The chemical / pharmaceutical industry can do this particularly Be interested.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Measuring Fluid Pressure (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Description
- Fig. 1
- ein Ausführungsbeispiels einer Flüssigkeitsringpumpe,
- Fig 2
- das Ausführungsbeispiel gemäss Fig. 1, wobei der Flüssigkeitsring und der Sensor zum Detektieren von Kavitationen zu erkennen sind,
- Fig. 3
- ein Beispiel eines typischen Verlaufs des absoluten Drucks (nur Gleichanteil) während des Einlernvorgangs des Sensors,
- Fig. 4
- der Verlauf des absoluten Drucks aus Fig.3, mit der Triggerung des Sensors im Betrieb, also mit eingelerntem Sensor,
- Fig. 5
- ein Blockschaltbild der Signalerzeugungseinheit eines Sensors,
- Fig. 6
- ein Blockschaltbild der Art und Weise der Signalauswertung im Sensor.
- Anzahl der Tangenten mit einer Steigung, die grösser ist als eine vorgegebene Mindeststeigung
- Absolute Grösse der Tangentensteilheit
- Amplitude der Schwankungen des Druckpegels (Wechselanteil) In der Detektionsstufe 27 ("Detection") schliesslich findet eine Gesamtbewertung sämtlicher Kriterien bzw. der zugehörigen Wahrscheinlichkeiten statt. Dabei kann den einzelnen Kriterien ein unterschiedliches Gewicht zugemessen werden. Die Gesamtbewertung aller Kriterien und der zugehörigen einzelnen Wahrscheinlichkeiten führt schliesslich zu einer Gesamtwahrscheinlichkeit, welche nach Vergleich mit den Vorgaben einer Alarmbedingungs-stufe 28 ("Alarm Conditions") dazu führen, dass von der Detektionsstufe 27 entweder ein Alarm ausgelöst wird oder nicht. Derartige Signalauswertungen, bei denen bei der Erfüllung von einzelnen Kriterien ein bestimmtes Ereignis mit einer bestimmten Wahrscheinlichkeiten eingetreten ist, basieren typischerweise auf den Prinzipien der Fuzzy-Logic.
Claims (13)
- Verfahren zum Detektieren von Kavitationen in einem zu überwachenden Raum, bei welchem Verfahren der zu überwachende Raum mittels eines lernfähigen Sensors (2) überwacht wird, wobei mindestens einmal während eines Lernvorgangs für die Dauer eines ersten Zeitintervalls (t1) ein Zustand hergestellt wird, in welchem in dem zu überwachenden Raum auf jeden Fall Kavitationen auftreten, nach Abschluss des ersten Zeitintervalls (t1) für die Dauer eines zweiten Zeitintervalls (t2) ein Zustand hergestellt wird, in welchem in dem zu überwachenden Raum auf jeden Fall keine Kavitationen auftreten, und wobei in jedem der beiden Zeitintervalle der Sensor (2) lernt, welche Signale Kavitationen bzw. welche Signale Nicht-Kavitationen in dem zu überwachenden Raum entsprechen, und dass nach dem Abschluss dieses Lernvorgangs der Sensor die im Betrieb in dem zu überwachenden Raum auftretenden Signale daraufhin untersucht, ob vorgebbare Kriterien, die aus den gelernten Signalen für die Kavitation bzw. Nicht-Kavitation abgeleitet sind, erfüllt sind und auf dieser Basis entscheidet, ob in dem zu überwachenden Raum eine Kavitation aufgetreten ist oder nicht und ein enstprechendes Ausgangssignal erzeugt.
- Verfahren nach Anspruch 1, bei welchem ein als Drucksensor ausgebildeter Sensor (2) verwendet wird und der Druck in dem zu überwachenden Raum überwacht wird.
- Verfahren nach Anspruch 2, bei welchem in dem zu überwachenden Raum sowohl der absolute Druck als auch die Druckveränderung, insbesondere beides, überwacht wird.
- Verfahren nach Anspruch 3, bei welchem beim Einlernvorgang zunächst in dem zu überwachenden Raum ein Druckabfall (31) erzeugt wird, der grösser ist als ein vorgebbarer Mindestdruckabfall, dass dann beim Unterschreiten bzw. Erreichen eines vorgebbaren Drucks, bei welchem in dem zu überwachenden Raum auf jeden Fall Kavitationen auftreten, der Sensor für das erste Zeitintervall (t1) getriggert wird, dass nach Abschluss des ersten Zeitintervalls (t1) ein Druckanstieg (33) erzeugt wird, der grösser oder gleich ist wie ein vorgebbarer Mindestdruckanstieg, und dass der Sensor (2) für das zweite Zeitintervall (t2) getriggert wird, sobald der Mindestdruckanstieg erreicht oder überschritten wird und ein vorgebbarer Druck (LO) erreicht oder überschritten wird.
- Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass beim Einlernvorgang der Sensor für das erste Zeitintervall (t1) erst dann getriggert wird, wenn der weitere Abfall des Drucks kleiner ist als ein vorgebbarer Schwellenwert, und dass nach Abschluss des ersten Zeitintervalls (t1) der Sensor (2) für das zweite Zeitintervall (t2) dann getriggert wird, wenn der Anstieg des Drucks grösser ist als ein vorgebbarer Schwellenwert.
- Verfahren nach einem der Ansprüche 1 bis 5, bei welchem der Sensor für verschiedene Kriterien festlegt, wie hoch bei Erfüllung des jeweiligen Kriteriums die Wahrscheinlichkeit ist, dass eine Kavitation aufgetreten ist, und dass anschliessend aufgrund sämtlicher Kriterien und der zugehörigen Wahrscheinlichkeiten der Sensor entscheidet, ob eine Kavitation aufgetreten ist oder nicht und das entsprechende Ausgangssignal erzeugt.
- Lernfähiger Sensor (2) zum Detektieren von Kavitationen, welcher Sensor Mittel (24) umfasst, die zunächst während eines Einlernvorgangs für die Dauer eines ersten Zeitintervalls (t1) Signale speichem , welche auftretenden Kavitationen entsprechen, und welche nach Abschluss des ersten Zeitintervalls (t1) für die Dauer eines zweiten Zeitintervalls (t2), in dem auf jeden Fall keine Kavitationen auftreten, Signale speichern, welche Nicht-Kavitationen entsprechen und wobei der Sensor ferner Mittel (26) umfasst, welche die im Betrieb auftretenden Signale auf die Erfüllung vorgebbarer Kriterien untersuchen, die aus den gelernten Signalen für die Kavitation bzw. Nicht-Kavitation abgeleitet sind, sowie Mittel (27), die auf dieser Basis entscheiden, ob eine Kavitation aufgetreten ist oder nicht und die dann ein entsprechendes Ausgangssignal erzeugen.
- Sensor nach Anspruch 7, welcher Mittel (21) zur Bestimmung des Drucks in dem zu überwachenden Raum aufweist.
- Sensor nach Anspruch 8, welcher sowohl Mittel (21) zur Bestimmung des Drucks als auch der Druckveränderung in dem zu überwachenden Raum, insbesondere zur Bestimmung von beidem, aufweist.
- Sensor nach Anspruch 9, welcher Mittel zum Triggern aufweist, die beim Einlernvorgang den Sensor für das erste Zeitintervall (t1) triggern, wenn in dem zu überwachenden Raum ein Druckabfall (31) erzeugt wird, der grösser ist als ein vorgebbarer Mindestdruckabfall und wenn ein vorgebbarer Druck erreicht oder unterschritten wird, bei welchem in dem zu überwachenden Raum auf jeden Fall Kavitationen auftreten, und die den Sensor für das zweite Zeitintervall (t2) triggern, sobald nach Abschluss des ersten Zeitintervalls (t1) ein Druckanstieg (33) erzeugt wird, der grösser oder gleich ist wie ein vorgebbarer Mindestdruckanstieg und sobald ein vorgebbarer Mindestdruck überschritten wird.
- Sensor nach Anspruch 10, dadurch gekennzeichnet, dass beim Einlernvorgang die Mittel zum Triggern, die beim Lernvorgang den Sensor für das erste Zeitintervall (t1) triggern, die Triggerung des Sensors erst dann bewirken, wenn der weitere Druckabfall kleiner ist als ein vorgebbarer Schwellenwert, und dass nach Abschluss des ersten Zeitintervalls (t1) die Mittel zum Triggern den Sensor für das zweite Zeitintervall (t2) dann triggern, wenn der Druckanstieg grösser ist als ein vorgebbarer Schwellenwert.
- Sensor nach einem der Ansprüche 7 bis 11, welcher Mittel (26) umfasst, die für verschiedene Kriterien festlegen, wie hoch bei Erfüllung des jeweiligen Kriteriums die Wahrscheinlichkeit ist, dass eine Kavitation aufgetreten ist, sowie Mittel (27), die anschliessend aufgrund sämtlicher Kriterien und der zugehörigen Wahrscheinlichkeiten entscheiden, ob eine Kavitation aufgetreten ist oder nicht und das entsprechende Ausgangssignal erzeugen.
- Vorrichtung, insbesondere Flüssigkeitsringpumpe (1), enthaltend einen Sensor nach einem der Ansprüche 7 bis 12.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59812383T DE59812383D1 (de) | 1998-03-19 | 1998-03-19 | Verfahren und Sensor zur Detektion von Kavitationen, sowie Vorrichtung enthaltend einen solchen Sensor |
EP98810237A EP0943805B1 (de) | 1998-03-19 | 1998-03-19 | Verfahren und Sensor zur Detektion von Kavitationen, sowie Vorrichtung enthaltend einen solchen Sensor |
AT98810237T ATE285037T1 (de) | 1998-03-19 | 1998-03-19 | Verfahren und sensor zur detektion von kavitationen, sowie vorrichtung enthaltend einen solchen sensor |
US09/270,958 US6206646B1 (en) | 1998-03-19 | 1999-03-17 | Method and sensor for the detection of cavitations and an apparatus containing a sensor of this kind |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98810237A EP0943805B1 (de) | 1998-03-19 | 1998-03-19 | Verfahren und Sensor zur Detektion von Kavitationen, sowie Vorrichtung enthaltend einen solchen Sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0943805A1 EP0943805A1 (de) | 1999-09-22 |
EP0943805B1 true EP0943805B1 (de) | 2004-12-15 |
Family
ID=8235999
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP98810237A Expired - Lifetime EP0943805B1 (de) | 1998-03-19 | 1998-03-19 | Verfahren und Sensor zur Detektion von Kavitationen, sowie Vorrichtung enthaltend einen solchen Sensor |
Country Status (4)
Country | Link |
---|---|
US (1) | US6206646B1 (de) |
EP (1) | EP0943805B1 (de) |
AT (1) | ATE285037T1 (de) |
DE (1) | DE59812383D1 (de) |
Families Citing this family (18)
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US7457785B1 (en) | 2000-08-25 | 2008-11-25 | Battelle Memorial Institute | Method and apparatus to predict the remaining service life of an operating system |
US6954713B2 (en) * | 2001-03-01 | 2005-10-11 | Fisher-Rosemount Systems, Inc. | Cavitation detection in a process plant |
WO2003054503A2 (en) * | 2001-12-07 | 2003-07-03 | Battelle Memorial Institute | Methods and systems for analyzing the degradation and failure of mechanical systems |
US7007747B2 (en) * | 2003-10-20 | 2006-03-07 | Mark Charles Kitchens | Structural support apparatus with active or passive heat transfer system |
DE102005019063B3 (de) * | 2005-04-23 | 2006-11-09 | Netzsch-Mohnopumpen Gmbh | Verfahren zum Betreiben einer Exzenterschneckenpumpe |
EP2014924A1 (de) * | 2007-07-12 | 2009-01-14 | Siemens Aktiengesellschaft | Laufradanordnung und Verfahren zur Zustandserkennung in einer Laufradanordnung |
JP4980948B2 (ja) * | 2008-02-22 | 2012-07-18 | ヤマハ発動機株式会社 | 舶用推進システム |
JP4980949B2 (ja) * | 2008-02-22 | 2012-07-18 | ヤマハ発動機株式会社 | 舶用推進システム |
EP2627998A4 (de) | 2010-10-15 | 2017-08-23 | Nanyang Technological University | Kavitationssensor |
EP2791511B1 (de) * | 2011-12-12 | 2016-09-14 | Sterling Industry Consult GmbH | Flüssigkeitsring-vakuumpumpe mit kavitationsregelung |
US9255578B2 (en) | 2012-07-31 | 2016-02-09 | Fisher-Rosemount Systems, Inc. | Systems and methods to monitor pump cavitation |
US10316504B2 (en) * | 2015-08-05 | 2019-06-11 | Aqseptence Group, Inc. | Vacuum sewage system with monitoring system and method of use |
GB2571971B (en) * | 2018-03-14 | 2020-09-23 | Edwards Tech Vacuum Engineering Qingdao Co Ltd | Liquid ring pump control |
US20190292734A1 (en) * | 2018-03-26 | 2019-09-26 | Roadtec, Inc. | Method and apparatus for avoiding or ameliorating cavitation in an asphalt cement fluid circuit |
KR20210079330A (ko) * | 2018-10-25 | 2021-06-29 | 에드워즈 테크놀로지스 배큠 엔지니어링 (칭다오) 컴퍼니 리미티드 | 액체 링 펌프의 제어 |
KR102027219B1 (ko) * | 2018-12-24 | 2019-10-01 | 주식회사 백콤 | 내부점검과 이물질 제거기능을 갖는 수봉식 진공펌프 |
US11939760B2 (en) | 2020-03-30 | 2024-03-26 | Aqseptence Group, Inc. | Vacuum sewage system with monitoring system and variable speed pump and methods of use |
US11713237B2 (en) * | 2020-07-14 | 2023-08-01 | Paragon Tank Truck Equipment, Llc | Liquid discharge system including liquid product pump having vibration sensor |
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Publication number | Priority date | Publication date | Assignee | Title |
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DE3420144A1 (de) * | 1984-05-30 | 1985-12-05 | Loewe Pumpenfabrik GmbH, 2120 Lüneburg | Regelungs- und steuerungssystem, insbes. fuer wassering-vakuumpumpen |
DE3425616A1 (de) * | 1984-07-12 | 1986-01-23 | Loewe Pumpenfabrik GmbH, 2120 Lüneburg | Anordnung zur minimierung des kuehlfluessigkeitsverbrauches insbes. bei fluessigkeitsring-vakuumpumpen o.dgl. |
US4608833A (en) * | 1984-12-24 | 1986-09-02 | Borg-Warner Corporation | Self-optimizing, capacity control system for inverter-driven centrifugal compressor based water chillers |
DE3520734A1 (de) * | 1985-06-10 | 1986-12-11 | Kraftwerk Union AG, 4330 Mülheim | Verfahren und einrichtung zum betrieb einer kreiselpumpe |
US4850805A (en) * | 1987-03-13 | 1989-07-25 | Critikon, Inc. | Pump control system |
US4913625A (en) * | 1987-12-18 | 1990-04-03 | Westinghouse Electric Corp. | Automatic pump protection system |
KR950005848B1 (ko) * | 1992-01-14 | 1995-05-31 | 삼성전자주식회사 | 보일러 순환펌프의 안전장치 |
DE19517289A1 (de) * | 1995-05-11 | 1996-11-14 | Klein Schanzlin & Becker Ag | Überwachungssystem zur Feststellung einer Kavitationsintensität |
US5669225A (en) * | 1996-06-27 | 1997-09-23 | York International Corporation | Variable speed control of a centrifugal chiller using fuzzy logic |
JPH1137979A (ja) * | 1997-07-24 | 1999-02-12 | Toshiba Corp | 流体機械のキャビテーション検出装置 |
-
1998
- 1998-03-19 AT AT98810237T patent/ATE285037T1/de not_active IP Right Cessation
- 1998-03-19 EP EP98810237A patent/EP0943805B1/de not_active Expired - Lifetime
- 1998-03-19 DE DE59812383T patent/DE59812383D1/de not_active Expired - Lifetime
-
1999
- 1999-03-17 US US09/270,958 patent/US6206646B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
ATE285037T1 (de) | 2005-01-15 |
DE59812383D1 (de) | 2005-01-20 |
EP0943805A1 (de) | 1999-09-22 |
US6206646B1 (en) | 2001-03-27 |
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