EP0660904B1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
EP0660904B1
EP0660904B1 EP94918260A EP94918260A EP0660904B1 EP 0660904 B1 EP0660904 B1 EP 0660904B1 EP 94918260 A EP94918260 A EP 94918260A EP 94918260 A EP94918260 A EP 94918260A EP 0660904 B1 EP0660904 B1 EP 0660904B1
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.)
Expired - Lifetime
Application number
EP94918260A
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German (de)
French (fr)
Other versions
EP0660904A1 (en
Inventor
Martin Stähle
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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

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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
    • 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 that occur locally in the pump chamber have different heights depending on the impeller configuration and accordingly cause different liquid-gas compositions.
  • the invention aims to improve the separation of liquid and gas compared to the prior art mentioned - regardless of the impeller configuration.
  • the vanes of the coaxial impeller which is non-rotatably connected to the impeller, or the vanes, which are attached to the impeller hub in a radial symmetry, 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 construction, from where the liquid is returned to the pump suction line.
  • 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 chamber 2 'to a hub chamber 7.
  • a connecting line 14 (FIG. 2) connecting to the diffuser tube 13 leads the gas-liquid mixture into a gas separator 15, which connects the liquid to the suction side Returns connection 16 of the centrifugal pump and discharges the gas through a line 17 into a suitable room.
  • a shaft seal 18 protects drive and bearing elements from contact with the material to be conveyed.

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

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 kennzeichnenden 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-Gaszusammensetzungen. Die Erfindung zielt darauf, die Trennung von Flüssigkeit und Gas gegenüber dem genannten Stand der Technik - unabhängig von der Laufradkonfiguration - zu verbessern.The overpressures that occur locally in the pump chamber have different heights depending on the impeller configuration and accordingly cause different liquid-gas compositions. The invention aims 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, koachsialen Flügelrads oder die radialsymmetrisch an der Laufradnabe 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 Labyrinthspalt zum Laufradkanal zurückgelangen kann. Die separierte Flüssigkeit anderseits erhält einen höheren Druck und wird durch die Düse einer Flüssigkeitsstrahlpumpe ausgetrieben. Der vom Flüssigkeitsstrahl erzeugte Unterdruck wird zur Wegschaffung der separierten Gase nutzbar gemacht. Das aus der Flüssigkeitsstrahlpumpe austretende Gasflüssigkeitsgemisch kann in einen Gasabscheider bekannter Bauart geleitet werden, von wo die Flüssigkeit in die Pumpensaugleitung zurückgeführt wird.The vanes of the coaxial impeller, which is non-rotatably connected to the impeller, or the vanes, which are attached to the impeller hub in a radial symmetry, 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. The separated liquid, on the other hand, 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 construction, from where the liquid is returned to the pump suction line.

Anhand der beiliegenden schematischen Zeichnung wird die Erfindung beispielsweise erläutert. Es zeigen:

Fig. 1
einen Querschnitt durch eine Kreiselpumpe und
Fig. 2
eine Ansicht der Kreiselpumpe in verkleinerter Darstellung.
The invention is explained, for example, with the aid of the attached schematic drawing. Show it:
Fig. 1
a cross section through a centrifugal pump and
Fig. 2
a view of the centrifugal pump in a reduced view.

Die Kreiselpumpe gemäss Fig. 1 weist ein offenes, einschaufliges 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 Labyrinthspalt 6 bildet. Der Labrinthspalt verbindet den Pumpenraum 2' mit einem Nabenraum 7. Aus dem Fördergut im Laufradzentrum 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 ferngehalten 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 Nabengehäusewand 20 durchsetzende Treibdüse 12 in ein Diffusorrohr 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 Gasabscheider 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 Fördergut.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 chamber 2 'to a hub chamber 7. Gas which has accumulated from the material to be conveyed in the impeller center and mixed with liquid passes through the labyrinth gap 6 from the pump chamber 2' into the hub chamber 7, where it is connected by vanes 8 connected to the hub 3 in a rotationally fixed manner experiences stronger rotational 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 enter a space 11 separated from the hub space 7 by the hub housing wall 20 can. 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 connects the liquid to the suction side Returns connection 16 of the centrifugal pump and discharges the gas through a line 17 into a suitable room. A shaft seal 18 protects drive and bearing elements from contact with the material to be conveyed.

Claims (3)

  1. A centrifugal pump for the delivery of suspended solids with a gas content, having an open impeller (1) comprising an impeller hub (3), which impeller is seated rotationally fixed on a shaft (4) and the blade edge or edges of which on the driving side rotates with a slight clearance (a) above a pump housing rear wall (5) which, at its inside diameter, forms a labyrinth gap (6) with the impeller (1), which labyrinth gap connects the pumping space (2') to a hub space (7) on the driving side which is separated by a hub housing wall (20), and which labyrinth gap allows gas which accumulates in the region of the centre of the impeller to enter the hub space (7) as a liquid/gas mixture, with coarse solid fractions being kept away, wherein a coaxial impeller wheel which is attached rotationally fixed to the impeller (1) is disposed in the hub space (7) or blades (8) are attached with radial symmetry to the impeller hub (6) therein, for the purpose of imparting a stronger rotational movement to the liquid in the hub space (7) and of transferring it outwards, wherein the hub space (7) is further provided with a peripheral opening (12) for the delivery of the liquid, and the air which accumulates in the region of the shaft (4) escapes on the driving side through a gap (10) formed by the hub housing wall (20) and the shaft (4), characterised in that the peripheral opening (12) is disposed in the hub housing wall (20) and is fashioned as a propulsion nozzle, that the opening (12) leads into a space (11) which adjoins the hub space (7) on the driving side and which is connected thereto by the gap (10), that the opening (12) is directed towards a diffuser tube (13) in such a way that it forms a liquid jet pump (12, 13) through which the liquid coming from the hub space (7) flows and which entrains and carries away the gas coming from the gap (10).
  2. A centrifugal pump according to claim 1, characterised in that the liquid/gas mixture emerging from the liquid jet pump (12, 13) is conveyed into a gas separator (15) from which the liquid is returned by a connecting line (16) to the centrifugal pump inlet and the gas is conveyed into a space which is allowed for its uptake.
  3. A centrifugal pump according to claim 1 or 2, characterised in that the blades of the impeller wheel or the blades fixed to the impeller hub (6) are situated opposite and at a distance from a guide spiral (9), preferably a spiral groove (9) or a spiral rib, which runs outwards in the direction of rotation of the shaft (4) and thereby keeps solid fractions 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
CH02160/93A CH689004A5 (en) 1993-07-16 1993-07-16 Centrifugal pump.
CH2160/93 1993-07-16
PCT/CH1994/000129 WO1995002768A1 (en) 1993-07-16 1994-06-24 Centrifugal pump

Publications (2)

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

Families Citing this family (7)

* Cited by examiner, † Cited by third party
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

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE2220875A1 (en) * 1972-04-28 1974-02-14 Rheinstahl Ag SELF-PRIMING CENTRIFUGAL PUMP
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
DE2757952C2 (en) * 1977-12-24 1983-02-24 Sihi Gmbh & Co Kg, 2210 Itzehoe Self-priming centrifugal pump
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.
US5114310A (en) * 1990-09-07 1992-05-19 A. Ahlstrom Corporation Centrifugal pump with sealing means
US5152663A (en) * 1990-09-07 1992-10-06 A. Ahlstrom Corporation Centrifugal pump
US5215430A (en) * 1992-02-26 1993-06-01 J. C. Carter Company, Inc. Ignition-source free fuel pump
US5413462A (en) * 1994-03-08 1995-05-09 Reliance Electric Industrial Co. Mechanical power transmission system having improved lubricant circulation apparatus

Also Published As

Publication number Publication date
CH689004A5 (en) 1998-07-15
WO1995002768A1 (en) 1995-01-26
US5545005A (en) 1996-08-13
JPH08501615A (en) 1996-02-20
CN1112371A (en) 1995-11-22
RU95108259A (en) 1997-03-10
RU2118712C1 (en) 1998-09-10
CN1063529C (en) 2001-03-21
EP0660904A1 (en) 1995-07-05
DE59401938D1 (en) 1997-04-10

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