EP2535591B1 - Pompe centrifuge - Google Patents

Pompe centrifuge Download PDF

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Publication number
EP2535591B1
EP2535591B1 EP11004859.2A EP11004859A EP2535591B1 EP 2535591 B1 EP2535591 B1 EP 2535591B1 EP 11004859 A EP11004859 A EP 11004859A EP 2535591 B1 EP2535591 B1 EP 2535591B1
Authority
EP
European Patent Office
Prior art keywords
sealing ring
wall
centrifugal pump
impeller
projections
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
EP11004859.2A
Other languages
German (de)
English (en)
Other versions
EP2535591A1 (fr
Inventor
Aage Bruhn
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 EP11004859.2A priority Critical patent/EP2535591B1/fr
Publication of EP2535591A1 publication Critical patent/EP2535591A1/fr
Application granted granted Critical
Publication of EP2535591B1 publication Critical patent/EP2535591B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
    • F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel

Definitions

  • the invention relates to a centrifugal pump with at least one impeller and at least one fixed sealing ring, which is in sealing contact with the impeller.
  • a seal is required on the impeller in the region of the suction mouth which seals the suction side of the impeller against the pressure side.
  • This seal which is usually formed as a sealing ring is between the impeller, d. H. the suction port of the impeller and an adjacent housing part or an adjacent wall arranged to seal the gap between the impeller and the housing part or the wall by the sealing ring. It is known to fix the sealing ring on the housing part or the wall.
  • a centering with respect to the impeller is required to minimize the friction between the seal ring and impeller. This requires accurate tolerances of all components to ensure adequate centering. In addition, an accurate assembly is required.
  • DE 34 38 480 A1 discloses a multi-stage centrifugal pump with closed impeller housing.
  • a sealing ring is arranged between the impeller housing and the impeller on the input side of the impeller.
  • This sealing ring has recesses on its outer circumference, in which projections engage in the housing.
  • the sealing ring is not fixed in the axial direction of the housing.
  • the centrifugal pump according to the invention has at least one impeller which is sealed on the input side by means of a sealing ring.
  • the sealing ring is known to be arranged between the suction opening or the suction mouth of the impeller and an adjacent fixed housing part or a wall of the housing. The sealing ring thus seals the suction side of the impeller from the pressure side.
  • a multi-stage centrifugal pump unit such a seal at each pump stage, d. H. required on each wheel.
  • the sealing ring bears against a wall of a housing surrounding the impeller, wherein it surrounds an inlet opening in the wall.
  • the sealing ring bears against the wall in the peripheral region of the inlet opening, preferably without interfering with the inlet opening itself.
  • the inlet opening is preferably free of parts of the sealing ring.
  • the sealing ring rests only on the surface of the wall, surrounding the inlet opening. This has the advantage that the sealing ring is not centered in the inlet opening on the wall, but can be centered alone with respect to the impeller, so that a precise centering in the area in which the relative movement between the impeller and sealing ring takes place, in order to minimize friction in this area.
  • the radial fixation of the sealing ring takes place by projections formed on the wall. These projections are also formed outside the inlet opening on the wall at the surface thereof.
  • the projections or depressions engage with corresponding recesses on the sealing ring in such a way that it is fixed in the radial direction, preferably also in the circumferential direction.
  • the fixation of the sealing ring between the projections or recesses in the radial direction is preferably carried out with play, so that the projections or depressions cause no centering of the sealing ring on the wall to a precise position, but the sealing ring, preferably automatically, opposite the inlet opening or can cite the suction mouth of the impeller, so that in this area the friction is minimized.
  • Low position deviations of the sealing ring relative to the inlet opening in the wall are negligible in comparison.
  • the sealing ring is fixed to the wall by three spaced-apart projections.
  • Three spaced-apart projections when distributed over the circumference, preferably distributed uniformly around the circumference, allow for fixation in all radial directions. For example, three projections may be spaced 120 ° apart.
  • the projections are formed, which engage in each case in a recess formed on the sealing ring.
  • the recesses may preferably be formed on the outer circumference of the sealing ring.
  • the recesses may be open to the outer circumference, ie as from the outer circumference be formed radially inwardly directed indentations on the outer circumference of the sealing ring. This engagement has the advantage that at the same time there is still a fixation in the circumferential direction, that is, that the sealing ring can not rotate relative to the wall.
  • the projections are preferably arranged so that they are spaced in the radial direction from a side surface of the respectively associated recess.
  • all the projections may be arranged to the recesses in this way, or merely a projection on one side of the sealing ring to allow a mobility in only one radial direction.
  • a corresponding distance is provided on all the projections and recesses, so that the sealing ring can move in all radial directions by a certain amount in order to be able to center preferably relative to the impeller can.
  • the recesses are formed on the outer circumference of the sealing ring and preferably extend parallel to the central axis of the sealing ring.
  • the recesses further preferably extend over the entire axial length of the sealing ring.
  • three recesses are formed on the sealing ring, which engage with three corresponding projections on the wall.
  • the recesses, such as the associated projections are preferably distributed uniformly over the circumference of the sealing ring. This allows a radial fixation, possibly with the game described above, in all radial directions.
  • the projections form at least part of an axial fixation of the sealing ring on the wall. Ie. the sealing ring is fixed on the projections in the axial direction on the wall. This can be done via holding elements which engage the projections or are connected to the projections or are engaged.
  • At least one spring element is provided which holds the sealing ring in contact with the wall.
  • a spring element ensures a sufficient compressive force to hold the sealing ring in sealing engagement with the wall or the fixed housing part.
  • a certain axial play of the sealing ring 16 is made possible. This game is used to compensate for tolerances.
  • the ring is pressed against the wall.
  • the spring element which holds the sealing ring in contact with the wall despite the game.
  • the projections are formed, for example, as threaded pins or threaded sleeves.
  • corresponding screws can engage, with which the sealing ring is screwed or fixed axially on the wall.
  • corresponding nuts could be placed on threaded pins in order to fix the sealing ring on the wall in the axial direction via the screw connection.
  • screw elements engage with the threaded pins or threaded sleeves, wherein the screw elements each have a contact surface, which are in contact with one of the wall facing away from the side of the sealing ring in such a way that the sealing ring between the contact surface and the wall is axially fixed.
  • the contact surface thus engages around the sealing ring or engages behind the Wall facing away surface of the sealing ring to fix it axially on the wall.
  • the contact surface can, for example be formed by a screw head or a nut, wherein between the contact surface and the sealing ring may optionally be additionally arranged a washer.
  • At least one spring element is preferably arranged between the contact surface and the sealing ring. This is compressed axially as a compression spring when screwing the screw into the threaded sleeve or when screwing the screw on a threaded pin, so that a spring force is generated, which presses the sealing ring against the wall.
  • the centrifugal pump shown by way of example has a multi-stage design and has six stages 2 in this example.
  • the centrifugal pump has a suction nozzle 4 and a pressure port 6 in a known manner.
  • a not shown here electric drive motor can be flanged, which drives the shaft 10.
  • Each stage 2 has an impeller 12 which is rotatably mounted on the shaft 10.
  • nozzles 14 are arranged, which supply the flow emerging from a preceding impeller 12 radially inwards again to the suction mouth of the following impeller 12.
  • sealing rings 16 are provided. These sealing rings 16 are each attached to a wall 18 of the stage housing of the pump stages 2.
  • the wall 18 separates two adjacent stages 2 from each other.
  • the wall 18 has a central inlet opening 20, which simultaneously represents the outlet opening of a preceding in the flow direction of the nozzle 14.
  • the sealing ring 16 is now arranged so that it does not engage in the inlet opening 20 and thus is not fixed in the interior of the inlet opening 20, but only on the wall of the 18th the inlet opening 20 surrounding abuts.
  • the fixing takes place via four projections in the form of threaded sleeves 22, which are fastened or formed on the wall 18.
  • the threaded sleeves 22 extend parallel to the longitudinal axis X of the centrifugal pump of the wall 18 away and have inside a thread, in which fastening screws 24 engage.
  • the recesses 26 have a semi-cylindrical shape and also extend parallel to the longitudinal axis X and are radially spaced therefrom so located that the threaded sleeves 22 engage in the recess 26.
  • the radial distance of the recesses of the longitudinal axis X is selected so that the threaded sleeves 22 do not come directly to the wall of the recesses 26 to the system, but that between the threaded sleeve 22 and the wall of the recess 26, a gap 28 remains.
  • gaps 28 provide for a certain radial clearance between the sealing ring 16 and the projections formed by the threaded sleeves 22. This allows the sealing ring 16 to center relative to the impeller 12, so that a possible low-friction engagement of the impeller 12 in the interior of the sealing ring 16 is possible.
  • the heads of the fastening screws 24 define contact surfaces and come with between laid washers 30, on the wall 18 facing away from the axial end face 32 to the plant.
  • the sealing ring 16 can be clamped between the heads of the fastening screws 24 and the washers 30 on one side and the wall 18 on the other side, so that the sealing ring 16 sealingly comes to rest against the surface of the wall 18.
  • Fig. 4 in addition to the embodiment in Fig. 3 arranged between the head of the fastening screw 24 of the washer 30 acting as a compression spring coil spring 34.
  • the coil spring 34 causes a contact force which presses the sealing ring 16 against the wall 18, at the same time a certain mobility ensures that the centering or alignment of the sealing ring 16 favors the impeller and allows tolerance compensation.
  • a coil spring 34 can be arranged in each case on each fastening screw 24.

Landscapes

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

Claims (9)

  1. Pompe centrifuge comprenant au moins une roue mobile (12) et au moins une bague d'étanchéité fixe (16) qui est en contact à joint étanche avec la roue mobile (12), la bague d'étanchéité (16) étant en contact avec une paroi (18) d'un corps qui entoure la roue mobile (12), entourant une ouverture d'entrée (20) ménagée dans la paroi (18) et étant fixée dans la direction radiale par trois protubérances (22) formées sur la paroi (18) et qui s'engagent chacune dans un évidement (26) formé sur la bague d'étanchéité (16), caractérisée en ce que les protubérances (22) forment également au moins une partie d'une fixation axiale de la bague d'étanchéité (16) à la paroi (18), et en ce que la bague d'étanchéité (16) est maintenue en contact avec la paroi (18) par au moins un élément élastique (34).
  2. Pompe centrifuge selon la revendication 1, caractérisée en que l'ouverture d'entrée (20) est dégagée de toute partie de la bague d'étanchéité (16).
  3. Pompe centrifuge selon l'une des revendications précédentes, caractérisée en ce que la bague d'étanchéité (16) est fixée avec du jeu dans la direction radiale entre les protubérances (22) ou les évidements.
  4. Pompe centrifuge selon la revendication 1, caractérisée en ce qu'au moins une protubérance (22) est espacée d'une surface latérale de l'évidement (26) correspondant dans la direction radiale.
  5. Pompe centrifuge selon l'une des revendications précédentes, caractérisée en ce que les évidements (26) sont formés sur la périphérie extérieure de la bague d'étanchéité (16) et en ce qu'ils s'étendent de préférence parallèlement à l'axe central (X) de la bague d'étanchéité (16).
  6. Pompe centrifuge selon l'une des revendications précédentes, caractérisée en ce que, sur la bague d'étanchéité (16), sont formés trois évidements (26) qui sont répartis régulièrement sur la périphérie de la bague d'étanchéité (10).
  7. Pompe centrifuge selon l'une des revendications précédentes, caractérisée en ce que les protubérances sont constituées par des tiges filetées ou des douilles filetées (22).
  8. Pompe centrifuge selon la revendication 7, caractérisée en ce que des éléments à vis (24) sont en prise avec les tiges filetées ou les douilles filetées (22), les éléments à vis (24) présentant chacun une surface de contact qui est en contact avec un côté de la bague d'étanchéité (16) opposé à la paroi (18) de telle sorte que la bague d'étanchéité (16) est fixée axialement entre la surface de contact et la paroi (18).
  9. Pompe centrifuge selon la revendication 8, caractérisée en ce qu'au moins un élément élastique (34) est disposé entre la surface de contact et la bague d'étanchéité (16).
EP11004859.2A 2011-06-15 2011-06-15 Pompe centrifuge Active EP2535591B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11004859.2A EP2535591B1 (fr) 2011-06-15 2011-06-15 Pompe centrifuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11004859.2A EP2535591B1 (fr) 2011-06-15 2011-06-15 Pompe centrifuge

Publications (2)

Publication Number Publication Date
EP2535591A1 EP2535591A1 (fr) 2012-12-19
EP2535591B1 true EP2535591B1 (fr) 2014-04-23

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ID=44772636

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11004859.2A Active EP2535591B1 (fr) 2011-06-15 2011-06-15 Pompe centrifuge

Country Status (1)

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EP (1) EP2535591B1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039435A1 (fr) * 1980-05-02 1981-11-11 Jacuzzi Inc. Bague d'étanchéité flottante pour pompe centrifuge
DE3438480A1 (de) * 1983-10-21 1985-05-09 Jacuzzi Europe S.P.A., Valvasone Mehrstufige kreiselpumpe mit geschlossenem laufradgehaeuse

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613486C2 (de) * 1996-04-04 1998-12-24 Grundfos As Dichtungsausbildung für Kreiselpumpen zur Verminderung des Spaltverluststromes im Saugmundbereich des Pumpenlaufrades
AU5411898A (en) * 1997-09-30 1999-04-23 Ebara Corporation Centrifugal pump and sealing mechanism thereof
DE19960160B4 (de) * 1999-12-14 2014-09-11 Mahle International Gmbh Vorrichtung zur Optimierung der Spaltweite bei Kreiselpumpen
JP4532142B2 (ja) * 2003-12-22 2010-08-25 株式会社荏原製作所 流体機械のシール機構又は遠心ポンプ
DE102008001814A1 (de) * 2008-05-15 2009-11-19 Würdig, Uwe Vorrichtung zur Laufradabdichtung bei Kreiselpumpen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0039435A1 (fr) * 1980-05-02 1981-11-11 Jacuzzi Inc. Bague d'étanchéité flottante pour pompe centrifuge
DE3438480A1 (de) * 1983-10-21 1985-05-09 Jacuzzi Europe S.P.A., Valvasone Mehrstufige kreiselpumpe mit geschlossenem laufradgehaeuse

Also Published As

Publication number Publication date
EP2535591A1 (fr) 2012-12-19

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