EP2535591A1 - Centrifugal pump - Google Patents

Centrifugal pump Download PDF

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Publication number
EP2535591A1
EP2535591A1 EP11004859A EP11004859A EP2535591A1 EP 2535591 A1 EP2535591 A1 EP 2535591A1 EP 11004859 A EP11004859 A EP 11004859A EP 11004859 A EP11004859 A EP 11004859A EP 2535591 A1 EP2535591 A1 EP 2535591A1
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EP
European Patent Office
Prior art keywords
sealing ring
wall
centrifugal pump
projections
pump according
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Granted
Application number
EP11004859A
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German (de)
French (fr)
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EP2535591B1 (en
Inventor
Aage Bruhn
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Grundfos Management AS
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Grundfos Management AS
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Priority to EP11004859.2A priority Critical patent/EP2535591B1/en
Publication of EP2535591A1 publication Critical patent/EP2535591A1/en
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    • 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.
  • 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 solely with respect to the impeller, so that a precise centering in the region in which the relative movement between impeller and sealing ring takes place, in order minimize friction in this area.
  • the radial fixation of the sealing ring which preferably does not engage in the inlet opening, is effected by at least two projections or recesses formed on the wall. These projections or recesses are also formed outside the inlet opening on the wall at the surface thereof.
  • the projections or depressions Preferably engage with corresponding recesses or projections on the sealing ring so 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 clearance, so that the projections or recesses 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 at least three spaced-apart projections or depressions.
  • Three spaced-apart projections or depressions if they are arranged distributed over the circumference, preferably distributed uniformly over the circumference, allow a fixation in all radial directions.
  • three projections may be spaced 120 ° apart.
  • projections are formed on the wall, which in each case engages 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 towards the outer periphery, ie be formed as from the outer circumference ago radially inwardly directed indentations on the outer circumference of the sealing ring. This intervention has the advantage that at the same time still a fixation in the circumferential direction takes place, ie 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.
  • At least three or four recesses are formed on the sealing ring, which engage with three or four 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 preferably form at least part of an axial fixation of the sealing ring on the wall. Ie. the sealing ring is fixed over the projections in the axial direction on the wall. This can be done via holding elements, which on attack 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 from the 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 such 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 18 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.

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

Abstract

The pump has a fixed seal ring (16) sealingly connected with an impeller (12), and resting against a wall (18) of a housing that surrounds the impeller. The sealing ring surrounds an inlet opening (20) in the wall and is fixed in a radial direction by two projections formed on the wall. The projections are engaged with recesses (26) that are formed at an outer peripheral part of the seal ring. The projections are designed as threaded pins or threaded sleeves (22), and the recesses are formed parallel to a central axis (X) of the seal ring.

Description

Die Erfindung betrifft eine Kreiselpumpe mit zumindest einem Laufrad und zumindest einem feststehenden Dichtungsring, welcher mit dem Laufrad in dichtender Anlage ist.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.

Bei Kreiselpumpe ist am Laufrad im Bereich des Saugmundes eine Dichtung erforderlich, welche die Saugseite des Laufrades gegenüber der Druckseite abdichtet. Diese Dichtung, welche üblicherweise als Dichtungsring ausgebildet ist, wird zwischen dem Laufrad, d. h. dem Saugmund des Laufrades und einem angrenzenden Gehäuseteil bzw. einer angrenzenden Wandung angeordnet, um den Spalt zwischen dem Laufrad und dem Gehäuseteil bzw. der Wandung durch den Dichtungsring abzudichten. Dabei ist es bekannt, den Dichtungsring an dem Gehäuseteil bzw. der Wandung zu fixieren. Dabei ist jedoch gleichzeitig eine Zentrierung gegenüber dem Laufrad erforderlich, um die Reibung zwischen Dichtungsring und Laufrad zu minimieren. Dies erfordert genaue Toleranzen sämtlicher Bauteile, um eine ausreichende Zentrierung zu gewährleisten. Darüber hinaus ist eine genaue Montage erforderlich.In the case of a centrifugal pump, 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. However, at the same time 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.

Im Hinblick auf diese Problematik ist es Aufgabe der Erfindung, eine Kreiselpumpe dahingehend zu verbessern, dass ein die Eintrittsseite des Laufrades abdichtender Dichtungsring einfacher zu montieren und einfacher relativ zu dem Laufrad zu zentrieren ist, ohne auf besonders geringe Toleranzen der Bauteile achten zu müssen.In view of this problem, it is an object of the invention to improve a centrifugal pump to the effect that a the inlet side of the impeller sealing sealing ring easier to install and easier to center relative to the impeller, without having to pay attention to very low tolerances of the components.

Diese Aufgabe wird durch eine Kreiselpumpe mit den in Anspruch 1 angegebenen Merkmalen gelöst. Bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen, der nachfolgenden Beschreibung sowie den beigefügten Figuren.This object is achieved by a centrifugal pump having the features specified in claim 1. Preferred embodiments result from the subclaims, the following description and the accompanying figures.

Die erfindungsgemäße Kreiselpumpe weist zumindest ein Laufrad auf, welches mit Hilfe eines Dichtungsringes eingangsseitig abgedichtet ist. Dabei ist der Dichtungsring bekannterweise zwischen der Saugöffnung bzw. dem Saugmund des Laufrades und einem angrenzenden feststehenden Gehäuseteil bzw. einer Wandung des Gehäuses angeordnet. Der Dichtungsring dichtet somit die Saugseite des Laufrades gegenüber der Druckseite ab. Im Falle eines mehrstufigen Kreiselpumpenaggregates ist eine solche Abdichtung an jeder Pumpenstufe, d. h. an jedem Laufrad erforderlich.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. In this case, 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. In the case of a multi-stage centrifugal pump unit such a seal at each pump stage, d. H. required on each wheel.

Erfindungsgemäß liegt der Dichtungsring an einer Wandung eines das Laufrad umgebenden Gehäuses an, wobei er eine Eintrittsöffnung in der Wandung umgibt. D. h. der Dichtungsring liegt an der Wandung im Umfangsbereich der Eintrittsöffnung an, vorzugsweise ohne in die Eintrittsöffnung selber einzugreifen. Insofern ist die Eintrittsöffnung vorzugsweise frei von Teilen des Dichtungsringes. Der Dichtungsring liegt lediglich an der Oberfläche der Wandung, die Eintrittsöffnung umgebend, an. Dies hat den Vorteil, dass der Dichtungsring nicht in der Eintrittsöffnung an der Wandung zentriert wird, sondern allein gegenüber dem Laufrad zentriert werden kann, sodass eine genaue Zentrierung in dem Bereich, in dem die Relativbewegung zwischen Laufrad und Dichtungsring stattfindet, erfolgen kann, um in diesem Bereich die Reibung zu minimieren.According to the invention, the sealing ring bears against a wall of a housing surrounding the impeller, wherein it surrounds an inlet opening in the wall. Ie. the sealing ring bears against the wall in the peripheral region of the inlet opening, preferably without interfering with the inlet opening itself. In this respect, 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 solely with respect to the impeller, so that a precise centering in the region in which the relative movement between impeller and sealing ring takes place, in order minimize friction in this area.

Die radiale Fixierung des Dichtungsringes, welcher vorzugsweise nicht in die Eintrittsöffnung eingreift, erfolgt durch zumindest zwei an der Wandung ausgebildete Vorsprünge oder Vertiefungen. Diese Vorsprünge oder Vertiefungen sind ebenfalls außerhalb der Eintrittsöffnung an der Wandung an deren Oberfläche ausgebildet. Die Vorsprünge oder Vertiefungen treten mit korrespondierenden Ausnehmungen oder Vorsprüngen an dem Dichtungsring vorzugsweise so in Eingriff, dass dieser in radialer Richtung, vorzugsweise auch in Umfangsrichtung fixiert wird.The radial fixation of the sealing ring, which preferably does not engage in the inlet opening, is effected by at least two projections or recesses formed on the wall. These projections or recesses are also formed outside the inlet opening on the wall at the surface thereof. The projections or depressions Preferably engage with corresponding recesses or projections on the sealing ring so that it is fixed in the radial direction, preferably also in the circumferential direction.

Dabei erfolgt die Fixierung des Dichtungsringes zwischen den Vorsprüngen oder Vertiefungen in radialer Richtung vorzugsweise mit Spiel, sodass auch die Vorsprünge oder Vertiefungen keine Zentrierung des Dichtungsringes an der Wandung auf eine genaue Position bewirken, sondern der Dichtungsring sich, vorzugsweise selbsttätig, gegenüber der Eintrittsöffnung bzw. dem Saugmund des Laufrades zitieren kann, sodass in diesem Bereich die Reibung minimiert wird. Geringe Lageabweichungen des Dichtungsringes relativ zu der Eintrittsöffnung in der Wandung sind demgegenüber unerheblich.In this case, the fixation of the sealing ring between the projections or recesses in the radial direction is preferably carried out with clearance, so that the projections or recesses 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.

Bevorzugt ist der Dichtungsring an der Wandung durch zumindest drei voneinander beabstandete Vorsprünge oder Vertiefungen fixiert. Drei voneinander beabstandete Vorsprünge oder Vertiefungen ermöglichen, wenn sie über den Umfang verteilt angeordnet sind, vorzugsweise gleichmäßig über den Umfang verteilt angeordnet sind, eine Fixierung in allen radialen Richtungen. Beispielsweise können drei Vorsprünge um 120° beabstandet sein. Auch eine Anordnung von vier Vorsprüngen oder Vertiefungen, welche dann vorzugsweise um 90° voneinander beabstandet sind, ist möglich.Preferably, the sealing ring is fixed to the wall by at least three spaced-apart projections or depressions. Three spaced-apart projections or depressions, if they are arranged distributed over the circumference, preferably distributed uniformly over the circumference, allow a fixation in all radial directions. For example, three projections may be spaced 120 ° apart. An arrangement of four projections or depressions, which are then preferably spaced apart by 90 °, is possible.

Besonders bevorzugt sind an der Wandung Vorsprünge ausgebildet, welche jeweils in eine an dem Dichtungsring ausgebildete Ausnehmung eingreift. Dabei können die Ausnehmungen vorzugsweise am Außenumfang des Dichtungsringes ausgebildet sein. Die Ausnehmungen können dabei zum Außenumfang hin geöffnet sein, d. h. als vom Außenumfang her radial nach innen gerichtete Einbuchtungen am Außenumfang des Dichtungsringes ausgebildet sein. Dieser Eingriff hat den Vorteil, dass gleichzeitig auch noch eine Fixierung in Umfangsrichtung erfolgt, d. h. dass der Dichtungsring sich nicht relativ zu der Wandung drehen kann.Particularly preferably, projections are formed on the wall, which in each case engages 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 towards the outer periphery, ie be formed as from the outer circumference ago radially inwardly directed indentations on the outer circumference of the sealing ring. This intervention has the advantage that at the same time still a fixation in the circumferential direction takes place, ie that the sealing ring can not rotate relative to the wall.

Die Vorsprünge sind vorzugsweise so angeordnet, dass sie in radialer Richtung von einer Seitenfläche der jeweils zugehörigen Ausnehmung beabstandet sind. Dabei können alle Vorsprünge zu den Ausnehmungen in dieser Weise angeordnet sein oder lediglich ein Vorsprung an einer Seite des Dichtungsringes, um eine Beweglichkeit in nur einer radialen Richtung zuzulassen. Vorzugsweise ist ein entsprechender Abstand jedoch an allen Vorsprüngen und Ausnehmungen vorgesehen, sodass der Dichtungsring sich in allen radialen Richtungen um ein gewisses Maß bewegen kann, um sich bevorzugt relativ zu dem Laufrad zentrieren zu können. Weiter bevorzugt sind die Ausnehmungen am Außenumfang des Dichtungsringes ausgebildet und erstrecken sich vorzugsweise parallel zur Mittelachse des Dichtungsringes. Dabei erstrecken sich die Ausnehmungen weiter bevorzugt über die gesamte axiale Länge des Dichtungsringes. So können sich in axialer Richtung von der Wandung erstreckende Stifte, welche die Vorsprünge bilden, in diese Ausnehmungen eingreifen.The projections are preferably arranged so that they are spaced in the radial direction from a side surface of the respectively associated recess. In this case, 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. Preferably, however, 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. More preferably, the recesses are formed on the outer circumference of the sealing ring and preferably extend parallel to the central axis of the sealing ring. In this case, the recesses further preferably extend over the entire axial length of the sealing ring. Thus, in the axial direction of the wall extending pins which form the projections, engage in these recesses.

Besonders bevorzugt sind zumindest drei oder vier Ausnehmungen an dem Dichtungsring ausgebildet, welche mit drei bzw. vier korrespondierenden Vorsprüngen an der Wandung in Eingriff treten. Dabei sind die Ausnehmungen, wie die zugehörigen Vorsprünge vorzugsweise gleichmäßig über den Umfang des Dichtungsringes verteilt. Dies ermöglicht eine radiale Fixierung, gegebenenfalls mit dem vorangehend beschriebenen Spiel, in allen radialen Richtungen.Particularly preferably, at least three or four recesses are formed on the sealing ring, which engage with three or four 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.

Darüber hinaus bilden die Vorsprünge vorzugsweise zumindest einen Teil einer axialen Fixierung des Dichtungsringes an der Wandung. D. h. der Dichtungsring wird über die Vorsprünge in axialer Richtung an der Wandung fixiert. Dies kann über Halteelemente geschehen, welche an den Vorsprüngen angreifen bzw. mit den Vorsprüngen verbunden sind oder in Eingriff sind.In addition, the projections preferably form at least part of an axial fixation of the sealing ring on the wall. Ie. the sealing ring is fixed over the projections in the axial direction on the wall. This can be done via holding elements, which on attack the projections or are connected to the projections or are engaged.

Dabei ist vorzugsweise zumindest ein Federelement vorgesehen, welches den Dichtungsring in Anlage mit der Wandung hält. Ein solches Federelement stellt eine ausreichende Druckkraft sicher, um den Dichtungsring in dichtender Anlage mit der Wandung bzw. dem feststehenden Gehäuseteil zu halten. Gleichzeitig wird ein gewisses axiales Spiel des Dichtungsringes 16 ermöglicht. Dieses Spiel dient dazu, Toleranzen auszugleichen. Bei hohem Druck auf der Druckseite der jeweiligen Pumpenstufe wird der Ring gegen die Wandung gedrückt. Wenn die Pumpe jedoch mit geringerem Druck und höherem Durchfluss arbeitet, ist es möglich, dass der Ring sich in axialer Richtung bewegt. Dies wird durch das Federelement verhindert, welches trotz des Spiels den Dichtungsring in Anlage mit der Wandung hält.In this case, preferably at least one spring element is provided which holds the sealing ring in contact with the wall. Such a spring element ensures a sufficient compressive force to hold the sealing ring in sealing engagement with the wall or the fixed housing part. At the same time a certain axial play of the sealing ring 16 is made possible. This game is used to compensate for tolerances. At high pressure on the pressure side of the respective pump stage, the ring is pressed against the wall. However, when the pump is operating at lower pressure and higher flow, it is possible for the ring to move in the axial direction. This is prevented by the spring element, which holds the sealing ring in contact with the wall despite the game.

Um eine axiale Fixierung zu ermöglichen, sind die Vorsprünge beispielsweise als Gewindestifte oder Gewindehülsen ausgebildet. In die Gewindehülsen können korrespondierende Schrauben eingreifen, mit welchen der Dichtungsring axial an der Wandung angeschraubt bzw. fixiert wird. Entsprechend könnten auf Gewindestifte korrespondierende Muttern aufgesetzt werden, um über die Schraubverbindung den Dichtungsring an der Wandung in axialer Richtung zu fixieren.In order to allow axial fixation, the projections are formed, for example, as threaded pins or threaded sleeves. In the threaded sleeves corresponding screws can engage, with which the sealing ring is screwed or fixed axially on the wall. Correspondingly, 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.

So sind vorzugsweise Schraubelemente mit den Gewindestiften oder Gewindehülsen in Eingriff, wobei die Schraubelemente jeweils eine Anlagefläche aufweisen, welche mit einer der Wandung abgewandten Seite des Dichtungsringes derart in Anlage sind, dass der Dichtungsring zwischen der Anlagefläche und der Wandung axial fixiert ist. Die Anlagefläche umgreift somit den Dichtungsring bzw. hintergreift die der Wandung abgewandte Oberfläche des Dichtungsringes, um diesen axial an der Wandung zu fixieren. Die Anlagefläche kann beispielsweise von einem Schraubenkopf oder einer Mutter gebildet werden, wobei zwischen der Anlagefläche und dem Dichtungsring gegebenenfalls zusätzlich eine Unterlegscheibe angeordnet sein.Thus, preferably, 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 from the 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.

Bei der Verwendung eines Federelementes ist vorzugsweise zwischen der Anlagefläche und dem Dichtungsring zumindest ein Federelement angeordnet. Dieses wird als Druckfeder beim Einschrauben des Schraubelements in die Gewindehülse bzw. beim Aufschrauben des Schraubelementes auf einen Gewindestift axial gestaucht, sodass eine Federkraft erzeugt wird, welche den Dichtungsring gegen die Wandung drückt.When using a spring element, 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.

Nachfolgend wird die Erfindung beispielhaft anhand der beigefügten Figuren beschrieben. In diesen zeigt:

Fig. 1
eine Schnittansicht einer Kreiselpumpe,
Fig. 2
vergrößert den Ausschnitt 11 in Fig. 1,
Fig. 3
eine perspektivische Explosionsansicht der Befestigung eines Dichtungsringes in der Kreiselpumpe gemäß den Fig. 1 und 2,
Fig. 4
vergrößert die Anordnung einer Befestigungsschraube in einer alternativen Ausführungsform der Erfindung,
Fig. 5
eine Schnittansicht des befestigten Dichtungsringes quer zur Längsachse der Kreiselpumpe, und
Fig. 6
eine vergrößerte Ausschnittansicht des Ausschnittes VI in Fig. 5.
The invention will now be described by way of example with reference to the accompanying drawings. In these shows:
Fig. 1
a sectional view of a centrifugal pump,
Fig. 2
increases the section 11 in Fig. 1 .
Fig. 3
an exploded perspective view of the attachment of a sealing ring in the centrifugal pump according to the Fig. 1 and 2 .
Fig. 4
enlarges the arrangement of a fastening screw in an alternative embodiment of the invention,
Fig. 5
a sectional view of the attached sealing ring transverse to the longitudinal axis of the centrifugal pump, and
Fig. 6
an enlarged sectional view of the section VI in Fig. 5 ,

Die in Fig. 1 beispielhaft gezeigte Kreiselpumpe ist mehrstufig ausgebildet und weist in diesem Beispiel sechs Stufen 2 auf. Die Kreiselpumpe weist in bekannter Weise einen Saugstutzen 4 und einen Druckstutzen 6 auf. Am in Fig. 1 oberen Ende 8 kann ein hier nicht gezeigter elektrischer Antriebsmotor angeflanscht werden, welcher die Welle 10 antreibt. Jede Stufe 2 hat ein Laufrad 12, welches drehfest auf der Welle 10 angeordnet ist. Zwischen den einzelnen Laufrädern 12 sind Leitapparate 14 angeordnet, welche die aus einem vorangehenden Laufrad 12 austretende Strömung radial wieder nach innen dem Saugmund des nachfolgenden Laufrades 12 zuführen. Zwischen der Ausgangsseite jedes Leitapparates 14 und der Eingangsseite bzw. dem Saugmund des in Strömungsrichtung folgenden Laufrades 12 ist eine Dichtung erforderlich, um zu verhindern, dass unter Druck stehendes Fluid von der Druckseite des Laufrades 12 direkt wieder zu Eingangsseite desselben Laufrades 12 strömen kann. Hierzu sind Dichtungsringe 16 vorgesehen. Diese Dichtungsringe 16 sind jeweils an einer Wandung 18 des Stufengehäuses der Pumpenstufen 2 befestigt. Die Wandung 18 trennt zwei aneinander angrenzende Stufen 2 voneinander. Die Wandung 18 weist eine zentrale Eintrittsöffnung 20 auf, welche gleichzeitig die Austrittsöffnung eines in Strömungsrichtung vorangehenden Leitapparates 14 darstellt. Durch die Eintrittsöffnung 20 strömt das Fluid in den Saugmund des nächsten Laufrades 12. Erfindungsgemäß ist der Dichtungsring 16 nun so angeordnet, dass sie nicht in die Eintrittsöffnung 20 eingreift und somit auch nicht im Inneren der Eintrittsöffnung 20 fixiert ist, sondern lediglich an der Wandung 18 die Eintrittsöffnung 20 umgebend anliegt. Die Fixierung erfolgt über vier Vorsprünge in Form von Gewindehülsen 22, welche an der Wandung 18 befestigt bzw. ausgebildet sind. Die Gewindehülsen 22 erstrecken sich parallel zur Längsachse X der Kreiselpumpe von der Wandung 18 weg und weisen im Inneren ein Gewinde auf, in welches Befestigungsschrauben 24 eingreifen.In the Fig. 1 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. At the in Fig. 1 upper end 8, 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. Between the individual wheels 12, 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. Between the output side of each nozzle 14 and the inlet side or the suction port of the impeller following in the flow direction 12, a seal is required to prevent pressurized fluid from the pressure side of the impeller 12 can flow directly back to the inlet side of the same impeller 12. For this purpose, 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. According to the invention, the sealing ring 16 is now arranged such 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 18 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.

Am Außenumfang des Dichtungsringes 16 sind am den den Winkelposition der Gewindehülsen 22 in entsprechenden Winkelpositionen im Wesentlichen halbkreisförmige Ausnehmungen 26 ausgebildet. Die Ausnehmungen 26 haben eine halbzylindrische Form und erstrecken sich ebenfalls parallel zur Längsachse X und sind von dieser radial beabstandet so gelegen, dass die Gewindehülsen 22 in die Ausnehmung 26 eingreifen. Dabei ist der radiale Abstand der Ausnehmungen von der Längsachse X so gewählt, dass die Gewindehülsen 22 nicht direkt an der Wandung der Ausnehmungen 26 zur Anlage kommen, sondern dass zwischen der Gewindehülse 22 und der Wandung der Ausnehmung 26 ein Spalt 28 verbleibt. Diese Spalte 28 sorgen für ein gewisses radiales Spiel zwischen dem Dichtungsring 16 und den von den Gewindehülsen 22 gebildeten Vorsprüngen. Dies ermöglicht dem Dichtungsring 16 sich relativ zu dem Laufrad 12 zu zentrieren, sodass ein möglichst reibungsarmer Eingriff des Laufrades 12 in das Innere des Dichtungsringes 16 möglich wird.On the outer circumference of the sealing ring 16 are formed in the angular position of the threaded sleeves 22 in corresponding angular positions substantially semicircular recesses 26. 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. These 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.

Die axiale Befestigung des Dichtungsringes 16 erfolgt über die Befestigungsschrauben 24, welche in die Gewindehülsen 22 eingeschraubt sind. Die Köpfe der Befestigungsschrauben 24 definieren Anlageflächen und kommen mit zwischen gelegten Unterlegscheiben 30, an der der Wandung 18 abgewandten axialen Stirnseite 32 zur Anlage. So kann der Dichtungsring 16 zwischen den Köpfen der Befestigungsschrauben 24 bzw. den Unterlegscheiben 30 auf der einen Seite und der Wandung 18 auf der anderen Seite geklemmt werden, sodass der Dichtungsring 16 dichtend an der Oberfläche der Wandung 18 zur Anlage kommt. Um eine gleichmäßige Anlagekraft zu erreichen, ist in dem Ausführungsbeispiel gemäß Fig. 4 zusätzlich zu der Ausführungsform in Fig. 3 zwischen dem Kopf der Befestigungsschraube 24 der Unterlegscheibe 30 eine als Druckfeder wirkende Schraubenfeder 34 angeordnet. Die Schraubenfeder 34 bewirkt eine Anlagekraft, welche den Dichtungsring 16 gegen die Wandung 18 drückt, gleichzeitig wird eine gewisse Beweglichkeit gewährleistet, welche die Zentrierung bzw. Ausrichtung des Dichtungsringes 16 zu dem Laufrad begünstigt und einen Toleranzausgleich ermöglicht. Eine solche Schraubenfeder 34 kann jeweils an jeder Befestigungsschraube 24 angeordnet sein.The axial attachment of the sealing ring 16 via the fastening screws 24, which are screwed into the threaded sleeves 22. 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. Thus, 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. In order to achieve a uniform contact force is in the embodiment according to 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. Such a coil spring 34 can be arranged in each case on each fastening screw 24.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

2 -2 -
Stufenstages
4 -4 -
Saugstutzensuction
6 -6 -
Druckstutzenpressure port
8 -8th -
oberes Endetop end
10 -10 -
Wellewave
12 -12 -
Laufräderimpellers
14 -14 -
Leitapparatenozzles
16 -16 -
Dichtungsringsealing ring
18 -18 -
Wandungwall
20 -20 -
Eintrittsöffnunginlet opening
22 -22 -
Gewindehülsenthreaded sleeves
24 -24 -
Befestigungsschraubenmounting screws
26 -26 -
Ausnehmungenrecesses
28 -28 -
Spaltgap
30 -30 -
Unterlegscheibenwashers
32 -32 -
Stirnseitefront
34 -34 -
Federfeather
X -X -
Längsachselongitudinal axis

Claims (13)

1. Kreiselpumpe mit zumindest einem Laufrad (12) und zumindest einem feststehenden Dichtungsring (16), welcher mit dem Laufrad (12) in dichtender Anlage ist, dadurch gekennzeichnet, dass der Dichtungsring (16) an einer Wandung (18) eines das Laufrad (16) umgebenden Gehäuses anliegt, eine Eintrittsöffnung (20) in der Wandung (18) umgibt und in radialer Richtung durch zumindest zwei an der Wandung (18) ausgebildete Vorsprünge (22) oder Vertiefungen fixiert ist. 1. Centrifugal pump with at least one impeller (12) and at least one fixed sealing ring (16) which is in sealing contact with the impeller (12), characterized in that the sealing ring (16) on a wall (18) of the impeller ( 16) surrounding the housing, an inlet opening (20) in the wall (18) surrounds and in the radial direction by at least two on the wall (18) formed projections (22) or depressions is fixed. 2. Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, dass die Eintrittsöffnung (20) frei von Teilen des Dichtungsringes (16) ist. 2. Centrifugal pump according to claim 1, characterized in that the inlet opening (20) is free of parts of the sealing ring (16). 3. Kreiselpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Dichtungsring (16) an der Wandung (18) durch zumindest drei voneinander beabstandete Vorsprünge (22) oder Vertiefungen fixiert ist. 3. Centrifugal pump according to claim 1 or 2, characterized in that the sealing ring (16) on the wall (18) by at least three spaced-apart projections (22) or depressions is fixed. 4. Kreiselpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Dichtungsring (16) zwischen den Vorsprüngen (22) oder Vertiefungen in radialer Richtung mit Spiel fixiert ist. 4. Centrifugal pump according to one of the preceding claims, characterized in that the sealing ring (16) is fixed between the projections (22) or depressions in the radial direction with play. 5. Kreiselpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Vorsprünge(22) jeweils in eine an dem Dichtungsring (16) ausgebildete Ausnehmung (26) eingreifen. 5. Centrifugal pump according to one of the preceding claims, characterized in that the projections (22) in each case engage in a formed on the sealing ring (16) recess (26). 6. Kreiselpumpe nach Anspruch 5, dadurch gekennzeichnet, dass zumindest ein Vorsprung (22) in radialer Richtung von einer Seitenfläche der zugehörigen Ausnehmung (26) beabstandet ist. 6. Centrifugal pump according to claim 5, characterized in that at least one projection (22) in the radial direction from a side surface of the associated recess (26) is spaced. 7. Kreiselpumpe nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Ausnehmungen (26) am Außenumfang des Dichtungsringes (16) ausgebildet sind und sich vorzugsweise parallel zur Mittelachse (X) des Dichtungsringes (16) erstrecken. 7. Centrifugal pump according to claim 5 or 6, characterized in that the recesses (26) on the outer circumference of the sealing ring (16) are formed and preferably parallel to the central axis (X) of the sealing ring (16) extend. 8. Kreiselpumpe nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass zumindest drei Ausnehmungen (26) an dem Dichtungsring (16) ausgebildet sind, welche vorzugsweise gleichmäßig über den Umfang des Dichtungsringes (10) verteilt sind. 8. Centrifugal pump according to one of claims 5 to 7, characterized in that at least three recesses (26) on the sealing ring (16) are formed, which are preferably evenly distributed over the circumference of the sealing ring (10). 9. Kreiselpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Vorsprünge (22) zumindest einen Teil einer axialen Fixierung des Dichtungsringes (16) an der Wandung (18) bilden. 9. Centrifugal pump according to one of the preceding claims, characterized in that the projections (22) form at least part of an axial fixation of the sealing ring (16) on the wall (18). 10. Kreiselpumpe nach Anspruch 9, dadurch gekennzeichnet, dass der Dichtungsring (16) durch zumindest ein Federelement (34) in Anlage mit der Wandung (18) gehalten wird. 10. Centrifugal pump according to claim 9, characterized in that the sealing ring (16) by at least one spring element (34) is held in contact with the wall (18). 11. Kreiselpumpe nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Vorsprünge als Gewindestifte oder Gewindehülsen (22) ausgebildet sind. 11. Centrifugal pump according to claim 9 or 10, characterized in that the projections are designed as threaded pins or threaded sleeves (22). 12. Kreiselpumpe nach Anspruch 11, dadurch gekennzeichnet, dass Schraubelemente (24) mit den Gewindestiften oder Gewindehülsen (22) in Eingriff sind, wobei die Schraubelemente (24) jeweils eine Anlagefläche aufweisen, welche mit einer der Wandung (18) abgewandten Seite des Dichtungsringes (16) derart in Anlage ist, dass der Dichtungsring (16) zwischen der Anlagefläche und der Wandung (18) axial fixiert ist. 12. Centrifugal pump according to claim 11, characterized in that screw elements (24) with the threaded pins or threaded sleeves (22) are in engagement, wherein the screw elements (24) each have a contact surface, which with one of the wall (18) facing away from the sealing ring (16) is in such a system that the sealing ring (16) between the contact surface and the wall (18) is axially fixed. 13. Kreiselpumpe nach Anspruch 12, dadurch gekennzeichnet, dass zwischen der Anlagefläche und dem Dichtungsring (16) zumindest ein Federelement (34) angeordnet ist. 13. Centrifugal pump according to claim 12, characterized in that between the contact surface and the sealing ring (16) at least one spring element (34) is arranged.
EP11004859.2A 2011-06-15 2011-06-15 Centrifugal pump Active EP2535591B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11004859.2A EP2535591B1 (en) 2011-06-15 2011-06-15 Centrifugal pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11004859.2A EP2535591B1 (en) 2011-06-15 2011-06-15 Centrifugal pump

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EP2535591A1 true EP2535591A1 (en) 2012-12-19
EP2535591B1 EP2535591B1 (en) 2014-04-23

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613486A1 (en) * 1996-04-04 1997-10-09 Grundfos As Seal on low-pressure end of centrifugal pump rotor
EP0905381A1 (en) * 1997-09-30 1999-03-31 Ebara Corporation Centrifugal pump
DE19960160A1 (en) * 1999-12-14 2001-06-21 Guenther Beez Rotary pump impeller casing bore gap optimizer rings impeller free end by seal-flanged collar joined to faced gap ring in inside casing.
US20060147328A1 (en) * 2003-12-22 2006-07-06 Shoji Ito Seal mechanism for fluid machine
DE102008001814A1 (en) * 2008-05-15 2009-11-19 Würdig, Uwe Device for impeller sealing in centrifugal pumps

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1158922A (en) * 1980-05-02 1983-12-20 James P. Larson Free floating sealing disk for centrifugal fluid pump
IT8323312V0 (en) * 1983-10-21 1983-10-21 Jacuzzi Europ MULTI-STAGE CENTRIFUGAL PUMP OF THE CLOSED IMPELLER TYPE.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613486A1 (en) * 1996-04-04 1997-10-09 Grundfos As Seal on low-pressure end of centrifugal pump rotor
EP0905381A1 (en) * 1997-09-30 1999-03-31 Ebara Corporation Centrifugal pump
DE19960160A1 (en) * 1999-12-14 2001-06-21 Guenther Beez Rotary pump impeller casing bore gap optimizer rings impeller free end by seal-flanged collar joined to faced gap ring in inside casing.
US20060147328A1 (en) * 2003-12-22 2006-07-06 Shoji Ito Seal mechanism for fluid machine
DE102008001814A1 (en) * 2008-05-15 2009-11-19 Würdig, Uwe Device for impeller sealing in centrifugal pumps

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