EP1612426B1 - Pompe multi-étages commandée à faible consommation d'énergie avec étage haute pression - Google Patents

Pompe multi-étages commandée à faible consommation d'énergie avec étage haute pression Download PDF

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Publication number
EP1612426B1
EP1612426B1 EP05011473.5A EP05011473A EP1612426B1 EP 1612426 B1 EP1612426 B1 EP 1612426B1 EP 05011473 A EP05011473 A EP 05011473A EP 1612426 B1 EP1612426 B1 EP 1612426B1
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EP
European Patent Office
Prior art keywords
centrifugal pump
shut
pressure
pump according
flow
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.)
Active
Application number
EP05011473.5A
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German (de)
English (en)
Other versions
EP1612426A3 (fr
EP1612426A2 (fr
Inventor
Thomas ELSÄSSER
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KSB AG
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KSB AG
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Publication of EP1612426A3 publication Critical patent/EP1612426A3/fr
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Publication of EP1612426B1 publication Critical patent/EP1612426B1/fr
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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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/10—Multi-stage pumps with means for changing the flow-path through the stages, e.g. series-parallel, e.g. side loads
    • 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
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • 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
    • F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel

Definitions

  • the invention relates to a centrifugal pump of multi-stage design, wherein for a removal of a subset of the total pump delivery in the pump housing behind the last pump stage, a flow guide channel is arranged, which supplies an additional impeller the removed subset, wherein the impeller exerts on the subset a further increase in pressure ,
  • a centrifugal pump is known in which a flow guide channel is arranged within the pump housing and after the impeller of the centrifugal pump. With the help of the already funded by the impeller total flow is taken from a subset in the last pump stage and fed to an additional impeller. With the impeller, a circulation of this subset takes place by a storage of the centrifugal pump. This subset is used for lubrication and cooling of the storage and then flows back into the centrifugal pump housing. Between the pump housing and bearing therefore circulating permanently serving a cooling subset.
  • multi-stage centrifugal pumps In large-scale plants, for example in power plants, mainly multi-stage centrifugal pumps are used, with which, for example, a steam generator, the necessary feed water quantities are supplied.
  • Such multistage centrifugal pumps often also have a so-called minimum volume control in order to ensure that during so-called standby operation of centrifugal pumps no overheating occurs.
  • the minimum quantity control has the further advantage that in the case of short-term performance requirements, the centrifugal pump can immediately switch to full-load operation.
  • a reduced amount of liquid with a higher pressure level is needed it generally provides such a multi-stage centrifugal pump. Such requirements are met with additional pumping units.
  • the invention is therefore based on the problem to develop for such additional and small amounts of liquid at high pressures, a solution by means of which a little more complex way of a multi-stage high-pressure centrifugal pump on the Auslegeddling beyond pressure increase is occasionally possible without this actual conveying task of such a centrifugal pump to negatively influence and to prevent the emergence of additional heat loads at a flow rate not required by the system.
  • a per se known, pressure increasing and arranged within the centrifugal pump behind the last pump stage special impeller generates a pressure increased subset and the subset flows to a flow divider provided with a line system that branch off from the flow divider at least two branches and at least a branch line is provided with a shut-off device.
  • a controlled version of a shut-off has proven, with which the delivery of the increased pressure subset is simplified.
  • a branch line leading away from the high-pressure region of the pump is provided with the shut-off element.
  • this solution Compared with the previously known minimum quantities of centrifugal pumps, this solution has the significant advantage that reduced in the branch only the pressure level of the special wheel and not - as before - the pressure level of the entire pump. This means a significant energy saving in the operation of the centrifugal pump.
  • a shut-off valve is arranged in each branch line and the obturator are controlled by a changeover circuit.
  • a changeover circuit For a safe flow control in the event of a return of the flow in the high pressure region of the pump or the connected line system and a removal of the subset of the pump is controlled. Due to the controlled changeover of the shut-off is always only a flow path is released while one or more other flow paths remain blocked.
  • a throttle device is arranged in the branch line leading back to the high-pressure region of the centrifugal pump.
  • the flow is fed into the discharge nozzle or a line connected thereto.
  • the throttle device reduces the pressure increase of the special impeller to the final pressure of the centrifugal pump.
  • the throttle device arranged in this branch line leading back to the centrifugal pump is thus adapted to the pressure increase of the special impeller and brings about a trouble-free combination of the two fluid streams.
  • a shut-off or a plurality of shut-off valves are designed as two switching positions having fittings.
  • predominantly functionally reliable valves are used as components with the two switching positions OPEN and CLOSE.
  • Their operation in a changeover circuit can be done in principle by manual and / or motorized means. This depends on the safety requirements of each installation. In every case of operation it should be ensured that only one of the branch lines is flowed through by the delivery rate of the special stage.
  • shut-off devices of the branch lines are mechanically, hydraulically, pneumatically or electrically connected to each other.
  • the respective other branch line is opened at the same time and vice versa.
  • This mutually dependent switching position of the valves is connected to protect the pump to the system control control technology and assigned a protection. The latter prevents unauthorized interventions.
  • the alternately switched shut-off devices always release only one outflow in the flow direction from the flow divider.
  • the flow divider is provided with a plurality of branch lines. This solution is used by a plurality of consumers. Likewise, it has proven to be advantageous if all shut-off devices are monitored and controlled in their position by a control unit. This simplifies the control and regulation handling of a centrifugal pump and the associated system.
  • the delivery flow of the special impeller and the delivery flow of the centrifugal pump flow as total delivery flow of the system.
  • the flow of the pump including the flow rate of the special stages of the actual delivery task of the pump available. This corresponds to the design criteria as in the absence of the special stage with the special wheel.
  • the pressure energy level losses are limited to a maximum of the pressure energy level of the special stage.
  • a multi-stage centrifugal pump 1 is shown in a schematic representation, in whose housing a shaft is arranged with a plurality of wheels.
  • a fluid to be pumped flows through a suction port 2 into the centrifugal pump, is increased in the pump stages in the pressure and is conveyed via the discharge port 3 back into a plant.
  • the arrows symbolize the flow direction in this context.
  • Behind the last pump stage 4, a special impeller 5 is arranged in the pump housing, which promotes a conduit system 6.
  • Within the conduit system 6 there is a flow divider 7, from which flows through a provided by the special impeller with higher pressure subset of the pump delivery in a leading branch line 8 or in a return to the centrifugal pump 1 branch line 9.
  • a throttle device 10 is ensured with the help that returns to the centrifugal pump 1 subset of the branch line 9 flows back with a pressure to the centrifugal pump, which corresponds to the end pressure generated by the last pump stage 4.
  • the returning branch line 9 in the region of the last pump stage 4 alternatively lead into the centrifugal pump, open into the discharge nozzle 3 or open into a connected to the discharge nozzle 3 pressure line 11. This is shown by a dashed representation of the branch line 9.
  • the flow divider 7 shown in the drawing outside of the centrifugal pump 1 may just as well be disposed within the pump housing.
  • Essential in this solution is at least the arrangement of a shut-12 in the leading away from flow divider 7 branch 8.
  • obturator 12 ensures that a supplied from the special impeller 5 subset supplied only in the respective case of need and with open shut-off valve 12 through the branch line 8 an external consumer can be.
  • the obturator 12 is closed, the subset circulates through the throttle device 10 and the returning branch line 9 back to the high-pressure side of the centrifugal pump.
  • shut-off element 12, 13 is arranged downstream of the flow divider 7 and in both branch lines 8, 9.
  • These shut-off devices are predominantly designed as valves having two switch positions, which primarily have an open-close function.
  • the shut-off devices 12, 13 may be mechanically, hydraulically, pneumatically and / or electrically connected to each other, so that only one outflow in a flow direction is ensured with a changeover circuit 14.
  • the changeover circuit 14 of the shut-off elements 12, 13 can be solved in this case by means of known connection techniques in a mechanical, electrical, pneumatic or hydraulic manner.
  • shut-off devices 12, 13 can be monitored in their position.
  • a connection with a higher-level system control unit is possible.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)

Claims (12)

  1. Pompe centrifuge de construction multi-étagée, un canal de guidage d'écoulement étant disposé derrière le dernier étage de pompe (4) dans le carter de pompe (1) pour un prélèvement d'une quantité partielle à partir de la quantité totale de refoulement de pompe, lequel canal de guidage d'écoulement achemine la quantité partielle prélevée jusqu'à une roue mobile supplémentaire, la roue mobile exerçant une augmentation de pression supplémentaire sur la quantité partielle, caractérisée en ce qu'une roue mobile spéciale (5) connue en soi, augmentant la pression et disposée à l'intérieur de la pompe centrifuge (1) derrière le dernier étage de pompe (4) produit une quantité partielle de pression augmentée et la quantité partielle s'écoule jusqu'à un système de conduites (6) pourvu d'un répartiteur d'écoulement (7), et en ce qu'au moins deux conduites de dérivation (8, 9) bifurquent à partir du répartiteur d'écoulement (7) et au moins une conduite de dérivation (8) est pourvue d'un organe d'arrêt (12).
  2. Pompe centrifuge selon la revendication 1, caractérisée en ce qu'une conduite de dérivation (8) partant de la région haute pression de la pompe (1) est pourvue de l'organe d'arrêt (12).
  3. Pompe centrifuge selon la revendication 1 ou 2, caractérisée en ce qu'un organe d'arrêt (12, 13) est disposé dans chaque conduite de dérivation (8, 9) et en ce que les organes d'arrêt (12, 13) sont commandés par le biais d'une connexion alternée (14) .
  4. Pompe centrifuge selon la revendication 1, 2 ou 3, caractérisée en ce qu'un dispositif d'étranglement (10) est disposé dans la conduite de dérivation (9) ramenant à la région haute pression de la pompe centrifuge (1).
  5. Pompe centrifuge selon la revendication 4, caractérisée en ce que le dispositif d'étranglement (10) réduit l'augmentation de pression de la roue mobile spéciale (5) à la pression finale de la pompe centrifuge (1).
  6. Pompe centrifuge selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'un organe d'arrêt (8) ou plusieurs organes d'arrêt (12, 13) sont réalisés sous forme de garnitures présentant deux positions de commutation.
  7. Pompe centrifuge selon l'une quelconque des revendications 3 à 6, caractérisée en ce que les organes d'arrêt (12, 13) des conduites de dérivation (8, 9) sont reliés les uns aux autres de manière mécanique, hydraulique, pneumatique ou électrique.
  8. Pompe centrifuge selon l'une quelconque des revendications 3 à 7, caractérisée en ce que les organes d'arrêt (12, 13) connectés en alternance libèrent un écoulement dans un sens d'écoulement à partir du répartiteur d'écoulement (7).
  9. Pompe centrifuge selon l'une quelconque des revendications 1 à 8, caractérisée en ce que le répartiteur d'écoulement (7) est pourvu de plusieurs conduites de dérivation (8, 9).
  10. Pompe centrifuge selon l'une quelconque des revendications 1 à 9, caractérisée en ce que la position de tous les organes d'arrêt (12, 13) est surveillée et commandée par une unité de commande (15) .
  11. Pompe centrifuge selon l'une quelconque des revendications 1 à 10, caractérisée en ce que, lorsque l'organe d'arrêt de la conduite de dérivation (9) d'alimentation est ouvert, le flux de refoulement de la roue mobile spéciale et le flux de refoulement de la pompe centrifuge s'écoulent en tant que flux d'écoulement total de l'installation.
  12. Pompe centrifuge selon l'une quelconque des revendications 1 à 11, caractérisée en ce que les pertes de hauteur d'énergie de pression sont limitées au maximum à la hauteur d'énergie de pression de l'étage spécial.
EP05011473.5A 2004-06-30 2005-05-27 Pompe multi-étages commandée à faible consommation d'énergie avec étage haute pression Active EP1612426B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102004031469A DE102004031469A1 (de) 2004-06-30 2004-06-30 Gesteuerte, energiesparende Mindestmengeneinrichtung einer mehrstufigen Kreiselpumpe mit einer Höchstdrucksonderstufe

Publications (3)

Publication Number Publication Date
EP1612426A2 EP1612426A2 (fr) 2006-01-04
EP1612426A3 EP1612426A3 (fr) 2009-06-24
EP1612426B1 true EP1612426B1 (fr) 2015-08-05

Family

ID=34936993

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Application Number Title Priority Date Filing Date
EP05011473.5A Active EP1612426B1 (fr) 2004-06-30 2005-05-27 Pompe multi-étages commandée à faible consommation d'énergie avec étage haute pression

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Country Link
EP (1) EP1612426B1 (fr)
CN (1) CN1715680B (fr)
DE (1) DE102004031469A1 (fr)
ES (1) ES2550242T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009031309A1 (de) * 2009-06-30 2011-01-05 Ksb Aktiengesellschaft Verfahren zur Förderung von Fluiden mit Kreiselpumpen

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118386A (en) * 1964-01-21 Multi-stage centrifugal pump
GB216893A (en) * 1923-06-01 1924-06-26 Sulzer Ag Improvements in or relating to apparatus for supplying water of different pressures on ships propelled by internal combustion engines
DE680838C (de) * 1937-07-15 1939-09-09 Aeg Kesselspeiseanlage mit einer mehrstufigen, mit Zwischenentnahme versehenen Kreiselpumpe
GB806219A (en) * 1955-10-29 1958-12-23 Oerlikon Maschf Multi-stage radial flow compressor and method of operating same
FR1201234A (fr) * 1957-08-10 1959-12-29 Babcock & Wilcox France Procédé pour la mise en route d'une chaudière à circulation forcée
CH562405A5 (en) * 1973-02-14 1975-05-30 Sulzer Ag Multi-or- single-stage centrifugal pump - has device driven by pump shaft for additional pressure intensification of part flow
DE8708334U1 (de) * 1987-06-12 1987-07-30 Dickow-Pumpen KG, 8264 Waldkraiburg Kreiselpumpe
DE4014720A1 (de) * 1989-05-12 1990-11-15 Ruhrkohle Ag Mehrstufige kreiselpumpe
EP0604390A3 (fr) * 1992-12-24 1995-04-19 Austrian Energy & Environment Méthode pour alimenter un générateur de vapeur à pressions multiples et pompe d'alimentation.
AU6260198A (en) * 1997-02-04 1998-08-25 William E. Murray Centrifugal process pump with auxiliary impeller
CN2551784Y (zh) * 2002-06-11 2003-05-21 赵其林 多级串联连体水泵

Also Published As

Publication number Publication date
CN1715680A (zh) 2006-01-04
ES2550242T3 (es) 2015-11-05
DE102004031469A1 (de) 2006-01-26
EP1612426A3 (fr) 2009-06-24
CN1715680B (zh) 2011-03-30
EP1612426A2 (fr) 2006-01-04

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