EP1593851A2 - Method for venting a centrifugal pump - Google Patents

Method for venting a centrifugal pump Download PDF

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Publication number
EP1593851A2
EP1593851A2 EP05003976A EP05003976A EP1593851A2 EP 1593851 A2 EP1593851 A2 EP 1593851A2 EP 05003976 A EP05003976 A EP 05003976A EP 05003976 A EP05003976 A EP 05003976A EP 1593851 A2 EP1593851 A2 EP 1593851A2
Authority
EP
European Patent Office
Prior art keywords
pump
speed
impeller
air
venting
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
EP05003976A
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German (de)
French (fr)
Other versions
EP1593851A3 (en
EP1593851B1 (en
Inventor
Günter Strelow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
Original Assignee
Wilo AG
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Filing date
Publication date
Application filed by Wilo AG filed Critical Wilo AG
Publication of EP1593851A2 publication Critical patent/EP1593851A2/en
Publication of EP1593851A3 publication Critical patent/EP1593851A3/en
Application granted granted Critical
Publication of EP1593851B1 publication Critical patent/EP1593851B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/02—Self-priming pumps

Definitions

  • the invention relates to a method for venting a centrifugal pump, especially in the water cycle of a heating system or hot water generating boilers, wherein the pump is preferably located directly in or at the inlet or outlet of a radiator is arranged.
  • the object of the invention is to provide a venting method that the Runner of a centrifugal pump freed from the accumulated air there.
  • This object is achieved in that to free the Impeller and / or the space surrounding the impeller of air, the Pump speed of the normal speed in particular for a short time on such a low speed is controlled, that the air separates from the impeller and exits the impeller space.
  • the inventive method is preferably for smaller pumps, the means used for pumps with a power of 0.001 to 40W.
  • these Pumps of smaller design and lower flow rate can become air in the Rotor space of the pump accumulate, because this air from the impeller is whirled around and thereby the promotion significantly sinks or even completely breaks off. This is especially common when using such smaller pumps in the water cycle of heating systems or hot water generating Boilers are used.
  • the pumped water always contains larger quantities in air, which gets caught in the impeller and in the space around the impeller and from the Impeller is swirled without leaving the impeller space.
  • the speed of the normal speed is short-term down to a lower speed, so the air from the Disconnect the impeller and exit the impeller chamber and thus to the automatic ventilation device in the upper area of the pump housing to escape to the atmosphere there. But it can be done instead the air after reaching a higher speed again, in particular the Normal speed, are brought out with the flow from the pump.
  • normal speed is meant the pump speed with which the Pump is currently driven before the down control. The normal speed is thus in the speed range in which the pump during the Promotion is driven.
  • the Pump speed is shut down only once, then again immediately afterwards to be driven up.
  • a particularly safe ventilation is then achieved when the pump speed several times in succession from the normal speed a lower speed is controlled down, that is, it takes place multiple alternation of normal speed and lower speed. in this connection the lower speed is 5 to 50% of the maximum speed.
  • the pump can also be switched off completely for a short time and especially in a momentary change of switching on and off.
  • the Off times are 0.5 to 15 seconds and the intervening Switch-on times 1 to 15 seconds.
  • a one-time shutdown especially a single shutdown, sufficient to air the impeller and in particular the impeller space to free.
  • the pump is shut down several times or switched off, especially 2 to 50 times.
  • the pump controller has a detection device of air quantities in Impeller chamber.
  • the pump control After this has detected the pump control, it drives the speed of the pump automatically down after the above procedure and after the one-off or repeated shutdown and startup or standstill is the Normal operation resumed.

Abstract

The method involves reducing the pump rotation speed from the normal speed to a lower speed for a short time, so that the air separates from the impeller and is vented from the impeller chamber. The lower speed is preferably between 5% and 50% of the maximum rotation speed.

Description

Die Erfindung betrifft ein Verfahren zum Entlüften einer Kreiselpumpe, insbesondere im Wasserkreislauf einer Heizungsanlage oder eines Warmwasser erzeugenden Boilers, wobei die Pumpe vorzugsweise direkt im oder am Ein- oder Auslass eines Heizkörpers angeordnet ist.The invention relates to a method for venting a centrifugal pump, especially in the water cycle of a heating system or hot water generating boilers, wherein the pump is preferably located directly in or at the inlet or outlet of a radiator is arranged.

Es ist bekannt, im oberen Bereich eines Pumpengehäuses eine Entlüftungsvorrichtung anzuordnen, die Luft aus dem Inneren des Pumpengehäuses entlässt, sobald sich im oberen Bereich Luft angesammelt hat. Insbesondere bei kleineren Pumpen hat es sich gezeigt, dass die Luft oft nicht bis in den oberen Pumpengehäusebereich gelangt, sondern sich im oder am Pumpenläufer verfängt und dort herumgewirbelt wird, ohne den Läufer zu verlassen. Dies führt zu einer geringeren Förderleistung der Pumpe und oft sogar zu einer Beendigung der Förderung.It is known in the upper part of a pump housing a To arrange ventilation device, the air from inside the Pump housing discharges as soon as air has accumulated in the upper area. Especially with smaller pumps, it has been shown that the air is often not reaches into the upper pump housing area, but in or on Pump runners get caught and whirled around there, without the runner leave. This leads to a lower pump capacity and often even to a termination of the promotion.

Aufgabe der Erfindung ist es, ein Entlüftungsverfahren zu schaffen, das den Läufer einer Kreiselpumpe von der sich dort angesammelten Luft befreit.The object of the invention is to provide a venting method that the Runner of a centrifugal pump freed from the accumulated air there.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass zum Befreien des Laufrades und/oder des das Laufrad umgebenden Raumes von Luft, die Pumpendrehzahl von der Normaldrehzahl insbesondere kurzzeitig auf eine solch niedrige Drehzahl heruntergesteuert wird, dass sich die Luft vom Laufrad trennt und aus dem Laufradraum austritt. This object is achieved in that to free the Impeller and / or the space surrounding the impeller of air, the Pump speed of the normal speed in particular for a short time on such a low speed is controlled, that the air separates from the impeller and exits the impeller space.

Ein solches Verfahren sorgt dafür, dass auch die Luftmengen sicher entfernt werden, die sich im oder am Laufrad befinden. Hierbei kann die Entlüftung selbsttätig erfolgen, sobald sich eine bestimmte Luftmenge am Laufrad angesammelt hat. Hierbei ist besonders vorteilhaft, wenn die Pumpendrehzahl mehrfach hintereinander heruntergefahren wird.Such a procedure ensures that the air volumes are safely removed be in or on the wheel. Here, the vent take place automatically, as soon as a certain amount of air on the impeller has accumulated. It is particularly advantageous if the pump speed is shut down several times in succession.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen aufgeführt.Advantageous embodiments of the method according to the invention are in the Subclaims listed.

Ausführungsbeispiele des erfindungsgemäßen Verfahrens werden im folgenden näher beschrieben.Embodiments of the method according to the invention are described below described in more detail.

Das erfindungsgemäße Verfahren wird vorzugsweise bei kleineren Pumpen, das heißt bei Pumpen mit einer Leistung von 0,001 bis 40 W verwendet. Bei diesen Pumpen kleinerer Bauart und geringerer Förderleistung kann sich Luft im Rotorraum der Pumpe ansammeln, weil diese Luft von dem Laufrad herumgewirbelt wird und hierdurch die Förderung erheblich sinkt oder sogar völlig abbricht. Dies kommt besonders häufig vor, wenn solch kleinere Pumpen im Wasserkreislauf von Heizungsanlagen oder bei Warmwasser erzeugenden Boilern eingesetzt werden. Das geförderte Wasser enthält stets größere Mengen an Luft, die sich im Laufrad und im Raum um das Laufrad verfängt und vom Laufrad umgewirbelt wird, ohne den Laufradraum zu verlassen.The inventive method is preferably for smaller pumps, the means used for pumps with a power of 0.001 to 40W. In these Pumps of smaller design and lower flow rate can become air in the Rotor space of the pump accumulate, because this air from the impeller is whirled around and thereby the promotion significantly sinks or even completely breaks off. This is especially common when using such smaller pumps in the water cycle of heating systems or hot water generating Boilers are used. The pumped water always contains larger quantities in air, which gets caught in the impeller and in the space around the impeller and from the Impeller is swirled without leaving the impeller space.

Wird bei einer solchen Pumpe die Drehzahl von der Normaldrehzahl kurzzeitig auf eine niedrigere Drehzahl heruntergesteuert, so kann sich die Luft vom Laufrad trennen und aus dem Laufradraum austreten und damit zu der automatischen Entlüftungsvorrichtung im oberen Bereich des Pumpengehäuses gelangen, um dort in die Atmosphäre auszutreten. Stattdessen kann aber auch die Luft nach dem Erreichen einer wieder höheren Drehzahl, insbesondere der Normaldrehzahl, mit dem Förderstrom aus der Pumpe herausgebracht werden. Unter "Normaldrehzahl" wird hierbei die Pumpendrehzahl verstanden, mit der die Pumpe zur Zeit vor dem Heruntersteuern gefahren wird. Die Normaldrehzahl befindet sich somit in dem Drehzahlbereich, in dem die Pumpe während der Förderung gefahren wird.In such a pump, the speed of the normal speed is short-term down to a lower speed, so the air from the Disconnect the impeller and exit the impeller chamber and thus to the automatic ventilation device in the upper area of the pump housing to escape to the atmosphere there. But it can be done instead the air after reaching a higher speed again, in particular the Normal speed, are brought out with the flow from the pump. By "normal speed" is meant the pump speed with which the Pump is currently driven before the down control. The normal speed is thus in the speed range in which the pump during the Promotion is driven.

Um das Pumpenlaufrad von der Luft zu befreien, kann es ausreichen, dass die Pumpendrehzahl nur einmal heruntergefahren wird, um danach gleich wieder heraufgefahren zu werden. Eine besonders sichere Entlüftung wird dann erreicht, wenn die Pumpendrehzahl mehrfach hintereinander von der Normaldrehzahl auf eine niedrigere Drehzahl heruntergesteuert wird, das heißt, es erfolgt ein mehrfacher Wechsel von Normaldrehzahl und niedrigerer Drehzahl. Hierbei beträgt die niedrigere Drehzahl 5 bis 50 % der maximalen Drehzahl.To free the pump impeller from the air, it may be sufficient that the Pump speed is shut down only once, then again immediately afterwards to be driven up. A particularly safe ventilation is then achieved when the pump speed several times in succession from the normal speed a lower speed is controlled down, that is, it takes place multiple alternation of normal speed and lower speed. in this connection the lower speed is 5 to 50% of the maximum speed.

Unter einer niedrigeren Drehzahl wird aber auch eine 0-Drehzahl verstanden, das heißt, die Pumpe kann auch kurzzeitig ganz ausgeschaltet werden und insbesondere in einem kurzzeitigen Wechsel von Ein- und Ausschalten. Die Ausschaltzeiten betragen 0,5 bis 15 Sekunden und die dazwischen liegenden Einschaltzeiten 1 bis 15 Sekunden. Wie oben bereits angeführt, kann ein einmaliges Herunterfahren, insbesondere auch ein einmaliges Ausschalten, ausreichen, um das Laufrad und insbesondere den Laufradraum von Luft zu befreien. Vorzugsweise wird aber die Pumpe mehrfach heruntergefahren oder ausgeschaltet, insbesondere 2 bis 50 mal.Under a lower speed but also a 0-speed is understood, that is, the pump can also be switched off completely for a short time and especially in a momentary change of switching on and off. The Off times are 0.5 to 15 seconds and the intervening Switch-on times 1 to 15 seconds. As stated above, a one-time shutdown, especially a single shutdown, sufficient to air the impeller and in particular the impeller space to free. Preferably, however, the pump is shut down several times or switched off, especially 2 to 50 times.

Damit das erfindungsgemäße Entlüftungsverfahren automatisch erfolgen kann, besitzt die Pumpensteuerung eine Erkennungseinrichtung von Luftmengen im Laufradraum. Hierzu werden die Leistungsaufnahme des Pumpenmotors, die Drehzahl der Pumpe, die Flüssigkeitstemperatur hinter der Pumpe, der Flüssigkeitsdruck hinter der Pumpe, der Flüssigkeitsdruck vor der Pumpe und/oder der Differenzdruck über der Pumpe gemessen und hierdurch erkannt, dass sich Luft im Laufrad und im Laufradraum angesammelt hat. Nachdem dies die Pumpensteuerung erkannt hat, fährt sie die Drehzahl der Pumpe selbsttätig nach dem obengenannten Verfahren herunter und nach dem einmaligen oder mehrmaligen Herunterfahren und Herauffahren bzw. Stillstand wird der Normalbetrieb wieder aufgenommen.So that the deaeration process according to the invention can take place automatically, the pump controller has a detection device of air quantities in Impeller chamber. For this purpose, the power consumption of the pump motor, the Speed of the pump, the liquid temperature behind the pump, the Fluid pressure behind the pump, fluid pressure in front of the pump and / or the differential pressure measured across the pump and thereby recognized, that air has accumulated in the impeller and impeller space. After this has detected the pump control, it drives the speed of the pump automatically down after the above procedure and after the one-off or repeated shutdown and startup or standstill is the Normal operation resumed.

Claims (10)

Verfahren zum Entlüften einer Kreiselpumpe, insbesondere im Wasserkreislauf einer Heizungsanlage oder eines Warmwasser erzeugenden Boilers, wobei die Pumpe vorzugsweise direkt im oder am Ein- oder Auslass eines Heizkörpers angeordnet ist, dadurch gekennzeichnet, dass zum Befreien des Laufrades und/oder des das Laufrad umgebenden Raumes von Luft, die Pumpendrehzahl von der Normaldrehzahl insbesondere kurzzeitig auf eine solch niedrige Drehzahl heruntergesteuert wird, dass sich die Luft vom Laufrad trennt und aus dem Laufradraum austritt.A method for venting a centrifugal pump, in particular in the water cycle of a heating system or a hot water-producing boiler, wherein the pump is preferably arranged directly in or at the inlet or outlet of a radiator, characterized in that to free the impeller and / or the surrounding space of the impeller of air, the pump speed is controlled down from the normal speed, in particular briefly to such a low speed that the air separates from the impeller and exits the impeller space. Verfahren nach Anspruch 1,dadurch gekennzeichnet, dass die Pumpendrehzahl mehrfach hintereinander von der Normaldrehzahl auf eine niedrige Drehzahl heruntergesteuert wird.A method according to claim 1, characterized in that the pump speed is controlled down several times in succession from the normal speed to a low speed. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die niedrige Drehzahl 5 % bis 50 % der maximalen Drehzahl beträgt.A method according to claim 1 or 2, characterized in that the low speed is 5% to 50% of the maximum speed. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Pumpe im kurzzeitigen Wechsel ein- und ausgeschaltet wird.Method according to one of the preceding claims, characterized in that the pump is switched on and off in the short-term change. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Ausschaltzeiten 0,5 bis 15 Sekunden betragen und die dazwischen liegenden Einschaltzeiten 1 bis 15 Sekunden betragen.A method according to claim 4, characterized in that the turn-off be 0.5 to 15 seconds and the intermediate turn-on times 1 to 15 seconds. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Anzahl des Herunterfahrens, insbesondere des Ausschaltens 2 bis 50 betragen. A method according to claim 4 or 5, characterized in that the number of shutdown, in particular the turn off 2 to 50 amount. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass zum Erkennen einer Luftmenge im Laufradraum die Leistungsaufnahme, der Strom, die Spannung, der Winkel cos ϕ des Motors des Pumpenmotors, die Drehzahl der Pumpe, die Flüssigkeitstemperatur hinter der Pumpe, der Flüssigkeitsdruck hinter der Pumpe, der Flüssigkeitsdruck vor der Pumpe und/oder der Differenzdruck über der Pumpe gemessen wird.Method according to one of the preceding claims, characterized in that for detecting an amount of air in the impeller space, the power consumption, the current, the voltage, the angle cos φ the motor of the pump motor, the speed of the pump, the liquid temperature behind the pump, the fluid pressure behind the Pump, the fluid pressure before the pump and / or the differential pressure across the pump is measured. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass nach dem Erkennen einer Luftmenge in der Pumpe die Pumpensteuerung die Drehzahl selbsttätig herunter fährt und nach dem Entlüftungszeitraum wieder herauf fährt.A method according to claim 7, characterized in that after the detection of an amount of air in the pump, the pump control automatically ramps down the speed and after the venting period moves up again. Verfahren nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass die Luft über eine selbsttätige Entlüftungsvorrichtung die Pumpe verlässt.Method according to one of the preceding claims, characterized in that the air leaves the pump via an automatic venting device. Anwendung des Verfahrens nach einem der vorherigen Ansprüche bei Pumpen mit einer hydraulischen Leistung von 0,001 bis 40 W.Application of the method according to one of the preceding claims Pumps with a hydraulic power of 0.001 to 40 W.
EP05003976.7A 2004-05-04 2005-02-24 Method for venting a centrifugal pump Active EP1593851B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004021988 2004-05-04
DE200410021988 DE102004021988A1 (en) 2004-05-04 2004-05-04 Method for venting a centrifugal pump

Publications (3)

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EP1593851A2 true EP1593851A2 (en) 2005-11-09
EP1593851A3 EP1593851A3 (en) 2010-12-29
EP1593851B1 EP1593851B1 (en) 2016-11-16

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EP05003976.7A Active EP1593851B1 (en) 2004-05-04 2005-02-24 Method for venting a centrifugal pump

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DE (1) DE102004021988A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016016212A1 (en) * 2014-07-31 2016-02-04 Xylem Ip Management Sàrl Method for operating a fluid delivery system, and delivery pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20240102478A1 (en) * 2022-09-22 2024-03-28 Grundfos Holding A/S Air venting

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841793A (en) 1973-09-24 1974-10-15 Gen Motors Corp Motor-pump system for preventing a vapor lock
EP0964158A2 (en) 1998-06-12 1999-12-15 Linde Aktiengesellschaft Pump operating process for boiling refrigerants or coolants

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520538A1 (en) * 1985-06-07 1986-12-11 Kraftwerk Union AG, 4330 Mülheim Method and device for operating a centrifugal pump
DE4422297C1 (en) * 1994-06-25 1995-08-31 Viessmann Werke Kg Central heating circulation pump control
DE10145410A1 (en) * 2001-09-14 2003-04-03 Wilo Gmbh Pump in the valve housing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3841793A (en) 1973-09-24 1974-10-15 Gen Motors Corp Motor-pump system for preventing a vapor lock
EP0964158A2 (en) 1998-06-12 1999-12-15 Linde Aktiengesellschaft Pump operating process for boiling refrigerants or coolants

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016016212A1 (en) * 2014-07-31 2016-02-04 Xylem Ip Management Sàrl Method for operating a fluid delivery system, and delivery pump

Also Published As

Publication number Publication date
EP1593851A3 (en) 2010-12-29
EP1593851B1 (en) 2016-11-16
DE102004021988A1 (en) 2005-11-24

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