EP1936205A1 - Procédé destiné au fonctionnement d'un agrégat de pompe centrifuge à vitesse de rotation réglable - Google Patents

Procédé destiné au fonctionnement d'un agrégat de pompe centrifuge à vitesse de rotation réglable Download PDF

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Publication number
EP1936205A1
EP1936205A1 EP06026796A EP06026796A EP1936205A1 EP 1936205 A1 EP1936205 A1 EP 1936205A1 EP 06026796 A EP06026796 A EP 06026796A EP 06026796 A EP06026796 A EP 06026796A EP 1936205 A1 EP1936205 A1 EP 1936205A1
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EP
European Patent Office
Prior art keywords
pump
characteristic
control
speed
operating
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.)
Withdrawn
Application number
EP06026796A
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German (de)
English (en)
Inventor
Heinz Dipl.-Phys. Bohn
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.)
Grundfos Management AS
Original Assignee
Grundfos Management AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Grundfos Management AS filed Critical Grundfos Management AS
Priority to EP06026796A priority Critical patent/EP1936205A1/fr
Publication of EP1936205A1 publication Critical patent/EP1936205A1/fr
Withdrawn legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a method for operating a variable speed centrifugal pump assembly with the features specified in the preamble of claim 1.
  • the characteristic curve of a pump indicates the behavior of the pump as a function of the operating conditions.
  • the effective pump characteristic can be varied within wide ranges by changing the speed.
  • a centrifugal pump due to the given mechanical / hydraulic conditions for each speed on a certain pump characteristic (throttle curve), which indicates the head depending on the flow rate.
  • throttle curve which indicates the head depending on the flow rate.
  • pump characteristics in which the delivery height decreases with increasing flow and which are referred to as stable. If, on the other hand, there are areas in which the delivery head increases with an increasing flow rate, this is called an unstable pump curve or throttle curve, which, in particular in conjunction with a flat pipe network characteristic, can result in no clear intersection between the pipe network characteristic and the pump characteristic but typically two intersections.
  • the invention has for its object to provide a method for operating a variable speed centrifugal pump assembly with unstable pump characteristic that avoids the aforementioned disadvantages and in particular ensures that there is always only one intersection between the pump characteristic and system characteristic.
  • the speed-controllable centrifugal pump assembly is operated with unstable pump characteristic so that the effective pump characteristic is raised to lower delivery heights by increasing the speed so far that always results in only one intersection with the current pipe network characteristic.
  • the basic idea of the present invention is thus, only if, on the one hand, the system characteristic curve is relatively flat and the pump is to be operated in the range of small flow rates, the pump characteristic curve is raised by increasing the speed so that it is ensured even in this area that only a clear point of intersection with the system characteristic so the pipe network characteristic of the system in which promotes the centrifugal pump is given.
  • This method according to the invention is particularly advantageous, since it makes it possible to drive centrifugal pump units with unstable pump curve, possibly also in the per se unstable conveying region of the characteristic curve stable.
  • the raising of the speed to low flow rates advantageously by a controller (open loop), which raises the power consumption of the pump set to low heads.
  • a controller may also be provided which raises the rotational speed of the pump assembly to low delivery heights.
  • a controller may also be provided which raises the rotational speed of the pump assembly to low delivery heights.
  • control / regulation it is expedient for the aforementioned control / regulation that, if it takes place as a subordinate regulation or control, it takes place so quickly that when the delivery rate drops, the normally resulting unstable states of the pump are not reached at all. This can be ensured by the subordinate fast control being designed to be faster than the inertia of the conveyed liquid column. Then it is ensured that the increase in the speed always takes place before the delivery has dropped so far that an unstable operating state could result.
  • the speed of the control Since the required speed of the control is dependent on the inertia of the pumped liquid column, the speed of the control will have to be adjusted to this case in individual cases. In practice, however, it has been found that it is sufficient for almost all applications if the subordinate fast control / regulation has a time constant or control time constant of less than one second preferably less than 300 ms. The last-mentioned time constant is sufficient even with comparatively small tube lengths to safely master the aforementioned problem and, moreover, can be implemented with relatively little technical effort in terms of control / regulation.
  • a centrifugal pump 1 delivers from a storage tank 2, a liquid via a line 3 with the interposition of a check valve 4 and a check valve 5 in a container 6.
  • a height difference Hg1 is overcome, which substantially the height difference between the liquid surface 0 of the comparatively corresponding to the level fluctuation substantially constant storage tank 2 to the liquid surface 7 of the comparatively small container 6, which it is necessary to fill.
  • the centrifugal pump 1 - which is a variable-speed centrifugal pump with an unstable pump characteristic - conveys a large amount Flow rate Q up to a head Hg 1.
  • the valve 5 is closed with increasing reaching the level 7, whereby the flow rate decreases slowly.
  • the pipe network characteristic of Ra changes to Rb, etc., then adjust according to operating points c, d, e, f, g, h and i, the further the valve 5 is closed. Due to sinking liquid level from level 7 to the level 8 is then to be overcome head Hg2 significantly lower than before during subsequent opening of the valve 5, which is why the flow rate then either increased abruptly, or almost dried there, as the FIG. 1 shows, the pump characteristic 9 has at least with the pipe network characteristic Rb two points of intersection and it is not predictable which of the two operating points adjusts itself.
  • Such behavior is highly undesirable if steady and stable operation is to be achieved in a flow range that is skipped, as it were.
  • Such an operating state can occur, for example, when pumping water into a steam boiler (boiler feed application) while using waste heat to heat the feed water.
  • the effective pump curve 9 is raised to falling flow rates so far that instead of the in FIG. 3 With 9 marked course a course 9 'results in which it is ensured that only one intersection with the pipe network characteristic is always given.
  • the pipe network characteristic Rb is shown, which is almost horizontal and therefore particularly critical for this application.
  • the pipe network characteristic Rb can be detected in a manner known per se, so that the self-adjusting pipe network characteristics are stored in the control or regulation of the pump and corresponding Speed increases can be made only in this critical area, as determined by FIG. 3 is shown.
  • the pump side To increase the speed to falling flow rates out, it is necessary on the pump side to detect the flow rate - also called flow. This can be done either by suitable sensors by direct measurement, or preferably by indirect measurement based on the electrical variables of the pump driving the electric motor.
  • the delivery rate of the pump can be detected, at least in the region of instability of the pump characteristic, if, as is typically the case, the power consumption with the delivery rate increases or decreases severely monotonically.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
EP06026796A 2006-12-22 2006-12-22 Procédé destiné au fonctionnement d'un agrégat de pompe centrifuge à vitesse de rotation réglable Withdrawn EP1936205A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06026796A EP1936205A1 (fr) 2006-12-22 2006-12-22 Procédé destiné au fonctionnement d'un agrégat de pompe centrifuge à vitesse de rotation réglable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06026796A EP1936205A1 (fr) 2006-12-22 2006-12-22 Procédé destiné au fonctionnement d'un agrégat de pompe centrifuge à vitesse de rotation réglable

Publications (1)

Publication Number Publication Date
EP1936205A1 true EP1936205A1 (fr) 2008-06-25

Family

ID=38108591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06026796A Withdrawn EP1936205A1 (fr) 2006-12-22 2006-12-22 Procédé destiné au fonctionnement d'un agrégat de pompe centrifuge à vitesse de rotation réglable

Country Status (1)

Country Link
EP (1) EP1936205A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102032200A (zh) * 2011-01-10 2011-04-27 靳波 给排水离心泵节电设计法
WO2013068016A1 (fr) * 2011-11-08 2013-05-16 Wärtsilä Svanehøj A/S Correction de la vitesse de pompes
EP2997284B1 (fr) 2013-05-17 2021-04-28 Gerald Hehenberger Procédé permettant de faire fonctionner une chaîne cinématique et chaîne cinématique
EP3108154B1 (fr) 2013-05-17 2021-05-05 Gerald Hehenberger Procédé permettant de faire fonctionner une chaîne d'entraînement et de transmission et chaîne d'entraînement et de transmission

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240380A (en) * 1991-05-21 1993-08-31 Sundstrand Corporation Variable speed control for centrifugal pumps
DE19645129A1 (de) * 1996-11-04 1998-05-07 Abb Patent Gmbh Verfahren zum kavitiationsfreien Betrieb einer drehzahlgeregelten Pumpe
US20040101415A1 (en) * 2001-08-16 2004-05-27 Levitronix Llc Method and a pump apparatus for the generation of an adjustable, substantially constant volume flow of a fluid and a use of this method
EP1431583A2 (fr) * 2002-12-20 2004-06-23 Dab Pumps S.p.A. Dispositif d'activation de pompes électriques pour système de distribution de liquide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5240380A (en) * 1991-05-21 1993-08-31 Sundstrand Corporation Variable speed control for centrifugal pumps
DE19645129A1 (de) * 1996-11-04 1998-05-07 Abb Patent Gmbh Verfahren zum kavitiationsfreien Betrieb einer drehzahlgeregelten Pumpe
US20040101415A1 (en) * 2001-08-16 2004-05-27 Levitronix Llc Method and a pump apparatus for the generation of an adjustable, substantially constant volume flow of a fluid and a use of this method
EP1431583A2 (fr) * 2002-12-20 2004-06-23 Dab Pumps S.p.A. Dispositif d'activation de pompes électriques pour système de distribution de liquide

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102032200A (zh) * 2011-01-10 2011-04-27 靳波 给排水离心泵节电设计法
WO2013068016A1 (fr) * 2011-11-08 2013-05-16 Wärtsilä Svanehøj A/S Correction de la vitesse de pompes
EP2997284B1 (fr) 2013-05-17 2021-04-28 Gerald Hehenberger Procédé permettant de faire fonctionner une chaîne cinématique et chaîne cinématique
EP3108154B1 (fr) 2013-05-17 2021-05-05 Gerald Hehenberger Procédé permettant de faire fonctionner une chaîne d'entraînement et de transmission et chaîne d'entraînement et de transmission
EP2997284B2 (fr) † 2013-05-17 2025-06-25 SET Sustainable Energy Technologies GmbH Procédé permettant de faire fonctionner une chaîne cinématique et chaîne cinématique

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