EP0660904A1 - Centrifugal pump. - Google Patents

Centrifugal pump.

Info

Publication number
EP0660904A1
EP0660904A1 EP94918260A EP94918260A EP0660904A1 EP 0660904 A1 EP0660904 A1 EP 0660904A1 EP 94918260 A EP94918260 A EP 94918260A EP 94918260 A EP94918260 A EP 94918260A EP 0660904 A1 EP0660904 A1 EP 0660904A1
Authority
EP
European Patent Office
Prior art keywords
impeller
hub
space
liquid
gap
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
EP94918260A
Other languages
German (de)
French (fr)
Other versions
EP0660904B1 (en
Inventor
Martin Staehle
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0660904A1 publication Critical patent/EP0660904A1/en
Application granted granted Critical
Publication of EP0660904B1 publication Critical patent/EP0660904B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
    • 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
    • F04D9/001—Preventing vapour lock
    • F04D9/002—Preventing vapour lock by means in the very pump
    • F04D9/003—Preventing vapour lock by means in the very pump separating and removing the vapour
    • 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
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/06—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock of jet type

Definitions

  • the present invention relates to a centrifugal pump according to the preamble of claim 1.
  • a centrifugal pump of this type is described for example in EP-PS 114 932.
  • the object of the present invention is to improve the separation of gas and liquid in a pump of the type mentioned.
  • the overpressures occurring locally in the pump chamber have different heights depending on the impeller configuration and accordingly result in different liquid-gas compositions.
  • the aim of the invention is to improve the separation of liquid and gas compared to the prior art mentioned - regardless of the impeller configuration.
  • the vanes of the coaxial axial impeller which is non-rotatably connected to the impeller, or the vanes attached radially symmetrically to the impeller hub capture the medium entering the hub space and set it in intensive rotation.
  • the separation of gas and liquid becomes clearer because the gas with the smallest diameter (at the shaft gap) can leave the hub space.
  • the gas leaves the hub space before it mixes with the liquid again and can return to the impeller channel due to the uneven pressure conditions in the labyrinth gap.
  • the separated liquid receives a higher pressure and is expelled through the nozzle of a liquid jet pump.
  • the negative pressure generated by the liquid jet is used to remove the separated gases.
  • the end The gas-liquid mixture emerging from the liquid jet pump can be passed into a gas separator of known design, from where the liquid is returned to the pump suction line.
  • Fig. 1 shows a cross section through a centrifugal pump and Fig. 2 is a view of the centrifugal pump in a reduced view.
  • the centrifugal pump according to FIG. 1 has an open, single-bladed centrifugal pump wheel 1 and is rotatably mounted in a pump housing 2.
  • the centrifugal pump wheel 1 sits with its hub 3 on a shaft 4 mounted in a bearing 19 and rotates with little play "a" over the rear wall 5, which forms a labyrinth gap 6 with the hub 3 of the centrifugal pump wheel 1.
  • the labyrinth gap connects the pump space 2 1 to a hub space 7. Gas which has been collected from the material to be conveyed in the impeller center and mixed with liquid passes through the labyrinth gap 6 from the pump space 2 'into the hub space 7, where it is rotatably connected to the hub 3 connected wing 8 experiences a stronger rotary movement.
  • the liquid flows under higher pressure from the hub space 7 through a drive nozzle 12 passing through the hub housing wall 20 into a diffuser tube 13 and thereby entrains the gas from the space 11.
  • a connecting line 14 (FIG. 2) connecting to the diffuser tube 13 leads the gas-liquid mixture into a gas separator 15, which separates the liquid from the suction side Returns connection 16 of the centrifugal pump and discharges the gas through a line 17 into a suitable space.
  • a shaft seal 18 protects drive and bearing elements from contact with the conveyor belt.

Landscapes

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

Abstract

Proposed is a pump with an impeller (1) which is securely mounted by its boss (3) on a shaft (4) so that it cannot rotate. The rear (driven) edges of the impeller rotate, leaving a narrow clearance (a), over the rear wall (5) of the pump housing. Together with the impeller (1), this wall forms a labyrinth gap (6) which connects the pump chamber (2') with a hollow space (7) in the boss. Connected in this hollow space (7) to the impeller (1) so that it cannot rotate is a coaxial flywheel designed to impart a vigorous rotational motion to the liquid in the hollow space (7) and hence force it out of the space. The space (7) has a peripheral opening (12) to allow the liquid to pass out. The air which collects near the shaft (4) escapes through a gap (10) between the boss-housing wall (20) and the shaft (4). The peripheral opening (12) is located in the boss-housing wall (20) and designed as a propulsion nozzle. It opens out into a space (11) adjacent to the hollow space (7) in the boss and connected to it by the gap (10), the nozzle pointing towards a diffusion tube (13) and forming a jet pump (12, 13) through which the liquid emerging from the hollow space (7) in the boss flows.

Description

KreiselpumpeCentrifugal pump
Die vorliegende Erfindung bezieht sich auf eine Kreiselpumpe gemäss dem Oberbegriff des Anspruchs 1.The present invention relates to a centrifugal pump according to the preamble of claim 1.
Eine Kreiselpumpe dieser Art ist beispielsweise in der EP-PS 114 932 beschrieben.A centrifugal pump of this type is described for example in EP-PS 114 932.
Die vorliegende Erfindung stellt sich die Aufgabe, bei einer Pumpe der genannten Art die Trennung von Gas und Flüssigkeit zu verbessern.The object of the present invention is to improve the separation of gas and liquid in a pump of the type mentioned.
Erfindungsgemäss wird diese Aufgabe gelöst durch die kenn¬ zeichnenden Merkmale des Anspruchs 1.According to the invention, this object is achieved by the characterizing features of claim 1.
Die im Pumpenraum örtlich auftretenden Überdrucke haben je nach Laufradkonfiguration unterschiedliche Höhe und bewirken entsprechend unterschiedliche Flüssigkeit-Gaszusammensetzun¬ gen. Die Erfindung zielt darauf, die Trennung von Flüssig- keit und Gas gegenüber dem genannten Stand der Technik - unabhängig von der Laufradkonfiguration - zu verbessern.The overpressures occurring locally in the pump chamber have different heights depending on the impeller configuration and accordingly result in different liquid-gas compositions. The aim of the invention is to improve the separation of liquid and gas compared to the prior art mentioned - regardless of the impeller configuration.
Die Flügel des mit dem Laufrad drehfest verbundenen, ko- achsialen Flügelrads oder die radialsymmetrisch an der Lauf- radnabe befestigten Flügel erfassen das in den Nabenraum tretende Medium und versetzen es in eine intensive Rotation. Das hat zur Folge, dass die Trennung von Gas und Flüssigkeit eindeutiger wird, weil das Gas am kleinsten Durchmesser (am Wellenspalt) den Nabenraum verlassen kann. Das Gas verlässt den Nabenraum bevor es sich wieder mit der Flüssigkeit mischt und durch die ungleichen Druckverhältnisse im Laby¬ rinthspalt zum Laufradkanal zurückgelangen kann. Die sepa¬ rierte Flüssigkeit anderseits erhält einen höheren Druck und wird durch die Düse einer Flüssigkeitsstrahlpumpe ausgetrie- ben. Der vom Flüssigkeitsstrahl erzeugte Unterdruck wird zur Wegschaffung der separierten Gase nutzbar gemacht. Das aus der Flüssigkeitsstrahlpumpe austretende Gasflüssigkeits¬ gemisch kann in einen Gasabscheider bekannter Bauart gelei¬ tet werden, von wo die Flüssigkeit in die Pumpensaugleitung zurückgeführt wird.The vanes of the coaxial axial impeller, which is non-rotatably connected to the impeller, or the vanes attached radially symmetrically to the impeller hub capture the medium entering the hub space and set it in intensive rotation. As a result, the separation of gas and liquid becomes clearer because the gas with the smallest diameter (at the shaft gap) can leave the hub space. The gas leaves the hub space before it mixes with the liquid again and can return to the impeller channel due to the uneven pressure conditions in the labyrinth gap. On the other hand, the separated liquid receives a higher pressure and is expelled through the nozzle of a liquid jet pump. The negative pressure generated by the liquid jet is used to remove the separated gases. The end The gas-liquid mixture emerging from the liquid jet pump can be passed into a gas separator of known design, from where the liquid is returned to the pump suction line.
Anhand der beiliegenden schematischen Zeichnung wird die Erfindung beispielsweise erläutert. Es zeigen:The invention is explained, for example, with the aid of the attached schematic drawing. Show it:
Fig. 1 einen Querschnitt durch eine Kreiselpumpe und Fig. 2 eine Ansicht der Kreiselpumpe in verkleinerter Darstellung.Fig. 1 shows a cross section through a centrifugal pump and Fig. 2 is a view of the centrifugal pump in a reduced view.
Die Kreiselpumpe ge äss Fig. 1 weist ein offenes, einschauf- liges Kreiselpumpenrad 1 auf und ist drehbar in einem Pumpengehäuse 2 gelagert. Das Kreiselpumpenrad 1 sitzt mit seiner Nabe 3 auf einer in einem Lager 19 gelagerten Welle 4 und dreht mit geringem Spiel "a" über der Gehäuserückwand 5, welche mit der Nabe 3 des Kreiselpumpenrades 1 einen Laby¬ rinthspalt 6 bildet. Der Labrinthspalt verbindet den Pumpen- räum 21 mit einem Nabenraum 7. Aus dem Fördergut im Laufrad- zentrum angesammeltes und mit Flüssigkeit vermischtes Gas tritt durch den Labyrinthspalt 6 aus dem Pumpenraum 2 ' in den Nabenraum 7, wo es durch drehfest mit der Nabe 3 verbundene Flügel 8 eine stärkere Drehbewegung erfährt. Die stärkere Drehbewegung des Gasflüssigkeitsgemisches bewirkt eine bessere Trennung zwischen Gas und Flüssigkeit, wobei allfällige Faserstoffe durch eine in einer Nabengehäusewand 20 angeordnete Spiralnute 9 von einem Wellenspalt 10 fern¬ gehalten wird, durch welchen die Gase in einen durch die Nabengehäusewand 20 vom Nabenraum 7 getrennten Raum 11 treten können. Während dessen strömt die Flüssigkeit unter höherem Druck aus dem Nabenraum 7 durch eine die Naben¬ gehäusewand 20 durchsetzende Treibdüse 12 in ein Diffusor- rohr 13 und reisst dabei das Gas aus dem Raum 11 mit. Eine an das Diffusorrohr 13 anschliessende Verbindungsleitung 14 (Fig. 2) führt das Gasflüssigkeitsgemisch in einen Gasab¬ scheider 15, der die Flüssigkeit an den saugseitigen Anschluss 16 der Kreiselpumpe zurückgibt und das Gas durch eine Leitung 17 in einen geeigneten Raum abführt. Eine Wellendichtung 18 schützt Antriebs- und Lagerelemente vor Berührung mit dem Fördergurt. The centrifugal pump according to FIG. 1 has an open, single-bladed centrifugal pump wheel 1 and is rotatably mounted in a pump housing 2. The centrifugal pump wheel 1 sits with its hub 3 on a shaft 4 mounted in a bearing 19 and rotates with little play "a" over the rear wall 5, which forms a labyrinth gap 6 with the hub 3 of the centrifugal pump wheel 1. The labyrinth gap connects the pump space 2 1 to a hub space 7. Gas which has been collected from the material to be conveyed in the impeller center and mixed with liquid passes through the labyrinth gap 6 from the pump space 2 'into the hub space 7, where it is rotatably connected to the hub 3 connected wing 8 experiences a stronger rotary movement. The greater rotational movement of the gas-liquid mixture results in a better separation between gas and liquid, any fibers being kept away from a shaft gap 10 by a spiral groove 9 arranged in a hub housing wall 20, through which the gases are passed into a space separated from the hub space 7 by the hub housing wall 20 11 can kick. During this time, the liquid flows under higher pressure from the hub space 7 through a drive nozzle 12 passing through the hub housing wall 20 into a diffuser tube 13 and thereby entrains the gas from the space 11. A connecting line 14 (FIG. 2) connecting to the diffuser tube 13 leads the gas-liquid mixture into a gas separator 15, which separates the liquid from the suction side Returns connection 16 of the centrifugal pump and discharges the gas through a line 17 into a suitable space. A shaft seal 18 protects drive and bearing elements from contact with the conveyor belt.

Claims

Patentansprüche claims
1. Kreiselpumpe zur Förderung von aufgeschwemmten Feststoffen mit Gasgehalt, mit einem offenen, eine Laufrad- nabe (3) aufweisenden Laufrad (1), welches drehfest auf einer Welle (4) sitzt und dessen antriebsseitige Schaufel¬ kante oder Kanten mit geringem Spiel (a) über einer Pumpen- gehäuserückwand (5) dreht, welche bei ihrem Innendurchmesser mit dem Laufrad (1) einen Labyrinthspalt (6) bildet, der den Pumpenraum (21 ) mit einem antriebsseitig durch eine Naben¬ gehäusewand (20) getrennten Nabenraum (7) verbindet, und im Laufradzentrumsbereich sich ansammelndes Gas als Flüssig¬ keitsgasgemisch, unter Fernhaltung von groben Festteilen in den Nabenraum (7) treten lässt, wobei im Nabenraum (7) mit dem Laufrad (1) drehfest verbunden ein koachsiales Flügelrad angeordnet ist oder radialsymmetrisch an der Laufradnabe (6) Flügel (8) befestigt sind, zum Zweck, der Flüssigkeit im Nabenraum (7) eine stärkere Rotationsbewegung zu erteilen und sie auszuschleudern, wobei weiter der Nabenraum (7) mit einer periferalen Öffnung (12) für den Austritt der Flüssig¬ keit versehen ist und die im Bereich der Welle (4) sich ansammelnde Luft antriebsseitig durch einen von der Naben¬ gehäusewand (20) und der Welle (4) gebildeten Spalt (10) entweicht, dadurch gekennzeichnet, dass die periferale Öffnung (12) in der Nabengehäusewand (20) angeordnet und als Treibdüse gestaltet ist, dass die Öffnung (12) in einen antriebseitig an den Nabenraum (7) angrenzenden und mit ihm durch den Spalt (10) verbundenen Raum (11) mündet, dass die Öffnung (12) gegen ein Diffusorrohr (11) gerichtet ist, der- art, dass sie eine Flüssigkeitsstrahlpumpe (12, 13) bildet, durch die die aus dem Nabenraum (8) kommende Flüssigkeit strömt und das aus dem Spalt (10) kommende Gas mitreisst und abfördert. 1. Centrifugal pump for conveying suspended solids with a gas content, with an open impeller (1) having an impeller hub (3), which sits non-rotatably on a shaft (4) and whose drive-side blade edge or edges with little play (a ) rotates over a pump housing rear wall (5), which, with its inner diameter, forms a labyrinth gap (6) with the impeller (1), which seals the pump chamber (2 1 ) with a hub chamber (7) separated on the drive side by a hub housing wall (20) ) connects, and gas accumulating in the impeller center area as a liquid gas mixture can be kept in the hub space (7) while keeping coarse solid parts away, a coaxial impeller being arranged in a rotationally fixed manner in the hub space (7) connected to the impeller (1) or being radially symmetrical the impeller hub (6) wings (8) are attached, for the purpose of giving the liquid in the hub space (7) a stronger rotational movement and ejecting it, the Na Benraum (7) is provided with a peripheral opening (12) for the exit of the liquid and the air collecting in the area of the shaft (4) on the drive side is formed by a wall of the hub housing (20) and the shaft (4) Gap (10) escapes, characterized in that the peripheral opening (12) is arranged in the hub housing wall (20) and is designed as a propellant nozzle, that the opening (12) in a drive side adjacent to the hub space (7) and with it through the Gap (10) connected space (11) opens that the opening (12) is directed against a diffuser tube (11) in such a way that it forms a liquid jet pump (12, 13) through which the from the hub space (8) incoming liquid flows and the gas coming out of the gap (10) entrains and conveys it away.
2. Kreiselpumpe nach Anspruch 1, dadurch gekenn¬ zeichnet, dass das aus der Flüssigkeitsstrahlpumpe (12, 13) austretende Flüssigkeitsgasgemisch in einen Gasabscheider (15) geleitet wird, von wo die Flüssigkeit mit einer An- Schlussleitung (16) zum Kreiselpumpeneintritt zurückgeführt und das Gas in einen zu dessen Aufnahme zulässigen Raum geleitet wird.2. Centrifugal pump according to claim 1, characterized gekenn¬ characterized in that the liquid jet pump (12, 13) emerging liquid gas mixture is passed into a gas separator (15), from where the liquid with a connecting line (16) is returned to the centrifugal pump inlet and the Gas is led into a space permitted for its reception.
3. Kreiselpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Flügel des Flügelrades oder die an der Laufradnabe (6) befestigten Flügel mit Abstand einer Leitspirale (9), vorzugsweise einer Spiralnut (9) oder einer Spiralrippe gegenüber liegen, die im Drehsinn der Welle (4) nach aussen läuft und dadurch Festteile vom Spalt (10) fern- hält. 3. Centrifugal pump according to claim 1 or 2, characterized in that the blades of the impeller or the blades attached to the impeller hub (6) are spaced apart from a guide spiral (9), preferably a spiral groove (9) or a spiral rib, which are in the direction of rotation the shaft (4) runs outwards and thereby keeps solid parts away from the gap (10).
EP94918260A 1993-07-16 1994-06-24 Centrifugal pump Expired - Lifetime EP0660904B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH2160/93 1993-07-16
CH02160/93A CH689004A5 (en) 1993-07-16 1993-07-16 Centrifugal pump.
PCT/CH1994/000129 WO1995002768A1 (en) 1993-07-16 1994-06-24 Centrifugal pump

Publications (2)

Publication Number Publication Date
EP0660904A1 true EP0660904A1 (en) 1995-07-05
EP0660904B1 EP0660904B1 (en) 1997-03-05

Family

ID=4227284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94918260A Expired - Lifetime EP0660904B1 (en) 1993-07-16 1994-06-24 Centrifugal pump

Country Status (8)

Country Link
US (1) US5545005A (en)
EP (1) EP0660904B1 (en)
JP (1) JPH08501615A (en)
CN (1) CN1063529C (en)
CH (1) CH689004A5 (en)
DE (1) DE59401938D1 (en)
RU (1) RU2118712C1 (en)
WO (1) WO1995002768A1 (en)

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Publication number Priority date Publication date Assignee Title
SE508348C2 (en) * 1996-03-27 1998-09-28 Sunds Defibrator Ind Ab Method and apparatus for pumping a gas-containing medium in which the gas is evacuated by the suction action of an ejector
US5997242A (en) * 1996-12-02 1999-12-07 Alden Research Laboratory, Inc. Hydraulic turbine
DE102009030161A1 (en) * 2009-06-24 2011-02-10 Schröder Maschinenbau KG Recirculation system for food-compatible liquids
DE102015002397A1 (en) * 2015-02-24 2016-08-25 Dickow-Pumpen Kg Cooling and degassing system
WO2016165090A1 (en) * 2015-04-16 2016-10-20 威海凌云流体传动科技有限公司 Gas-liquid two-phase pump
US20190023411A1 (en) * 2017-07-24 2019-01-24 Hamilton Sundstrand Corporation Hydrocarbon fuel system
US11781556B2 (en) 2018-08-27 2023-10-10 The Texas A&M University System High energy density turbomachines

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GB775161A (en) * 1954-05-17 1957-05-22 Rene Leduc Improvements in centrifugal pump installations
DE1098364B (en) * 1957-06-27 1961-01-26 Paul Bungartz Shaft gap seal for centrifugal pumps, centrifugal compressors, agitators, etc. Like. With an auxiliary conveyor wheel
GB1027790A (en) * 1964-03-10 1966-04-27 Frank Mohn Improvements in self-priming centrifugal pumps
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CH557472A (en) * 1972-09-13 1974-12-31 Sulzer Ag Rotary pump for delivering superheated media - has bypass for cooling of shaft seals and shaft bearings
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EP0114932B1 (en) * 1982-12-22 1986-09-03 Martin Stähle Centrifugal pump of the open channel rotor type
FI73023C (en) * 1984-07-17 1987-08-10 Ahlstroem Oy ANORDINATION FOR AVAILABILITY OF FIBERS AND PENSION.
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US5215430A (en) * 1992-02-26 1993-06-01 J. C. Carter Company, Inc. Ignition-source free fuel pump
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Title
See references of WO9502768A1 *

Also Published As

Publication number Publication date
JPH08501615A (en) 1996-02-20
US5545005A (en) 1996-08-13
CN1063529C (en) 2001-03-21
RU2118712C1 (en) 1998-09-10
EP0660904B1 (en) 1997-03-05
CN1112371A (en) 1995-11-22
DE59401938D1 (en) 1997-04-10
RU95108259A (en) 1997-03-10
CH689004A5 (en) 1998-07-15
WO1995002768A1 (en) 1995-01-26

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