EP1331399A1 - Floating pump bearing - Google Patents

Floating pump bearing Download PDF

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Publication number
EP1331399A1
EP1331399A1 EP03290029A EP03290029A EP1331399A1 EP 1331399 A1 EP1331399 A1 EP 1331399A1 EP 03290029 A EP03290029 A EP 03290029A EP 03290029 A EP03290029 A EP 03290029A EP 1331399 A1 EP1331399 A1 EP 1331399A1
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EP
European Patent Office
Prior art keywords
bearing
inner ring
shaft
ring
bearing according
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.)
Withdrawn
Application number
EP03290029A
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German (de)
French (fr)
Inventor
Michel Caigny
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KSB SAS
Original Assignee
KSB SAS
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Filing date
Publication date
Application filed by KSB SAS filed Critical KSB SAS
Publication of EP1331399A1 publication Critical patent/EP1331399A1/en
Withdrawn legal-status Critical Current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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0465—Ceramic bearing designs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D1/06—Multi-stage pumps
    • F04D1/063—Multi-stage pumps of the vertically split casing type
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings

Definitions

  • Multicell pump includes a stack of impellers integral in rotation with a common shaft by means of at least one bearing. Each wheel is inserted into a diffuser. The diffusers are held together by forming a fixed pump body by means of support which are usually tie rods.
  • the bearing includes a ring interior of a material having a first hardness, in particular of sintered materials, such as carbides or graphite. The inner ring is integral in rotation with the shaft.
  • the bearing also includes a ring outer, usually of the same material of great hardness, which is fixed to the body and which is arranged opposite the inner ring with a certain game.
  • the inner ring and the outer ring rotate one compared to the other at high speed of up to 3500 rpm, they must be made of a material of great hardness so that there is no wear and the friction coefficient remains substantially constant.
  • the such hard materials are necessarily fragile. They are not able to withstand great mechanical stresses, so yet they are subject to such constraints when they transmit the forces applied by clamping means to the wheels axial.
  • There is often a rupture of the inner ring which causes the wheels are released inside the body. The wheels hit the diffusers and destroy themselves. A simple rupture of the bearing thus causes the total destruction of the pump.
  • Document EP 0667 456 discloses a centrifugal pump having a shaft end bearing, having an inner ring integral in rotation with the shaft, an outer ring facing the ring inner, an annular jacket interposed between the inner ring and the tree and having a rim at one end.
  • the bearing also has a clamping ring at the end of the tree.
  • This type of bearing cannot be used as a bearing intermediate in a multicellular pump.
  • this bearing is poorly lubricated and an additional device must be provided, namely the labyrinth (58 ') which ensures the presence of the element lubricant by sucking through the bearing part of the pumped liquid according to a direction of rotation (that of the labyrinth).
  • the labyrinth 58 '
  • the invention remedies these drawbacks by a bearing which can be used as an end bearing as well as an intermediate bearing, which is less subject to destruction, easier to manufacture, better lubricated and which, even when the inner ring seizes up, still retains a certain bearing function.
  • the bearing is as defined in claim 1.
  • the ring interior retains the function of ensuring the consistency of the coefficient of friction and resistance to wear, but it no longer has to provide resistance to axial stress due to the forces applied by the axial clamping means, this function being supported by the shirts which, made up of a less hard and therefore less fragile material, can better assume it.
  • the shirts may be made of metal and are in particular, preferably, stainless steel.
  • the inner ring seizes, without being able to turn by compared to the outer ring, it still has the possibility of turning by compared to shirts, which provides a leveling effect at least of relief. Even if the inner ring breaks, the bearing effect certainly disappears, but the wheels remain held in place by the clamping means. The pump does not destroy itself.
  • the drive means of the inner ring by the shirts is an elastic means, in particular being an O-ring interposed between the radial flanges and the inner ring.
  • This allows to flexibly compensate for dimensional tolerances between the ring inner and liners and thus prevents breakage of the inner ring.
  • a clearance is provided between the two shirts and the inner ring.
  • the present invention also relates to a multicellular pump having a bearing according to the invention.
  • Figure 1 is a partial view in axial section of a pump according to the invention.
  • Figure 2 is an enlarged view of the bearing of the pump of figure 1.
  • the multicell pump shown in Figure 1 includes a stack of wheels 1, integral in rotation with a shaft 2, the wheels being pinched between spacers 3, the shaft is common to all the wheels which are held together by end clamping means, comprising successively, from the inside to the outside, a washer 4 and a nut 5 inchtsserable. By tightening the nut, we tighten the spacers and thus tighten the wheels 1 also via the bearing which will be described in a way more precise below.
  • Each wheel 1 is inserted into a diffuser 6.
  • the diffusers 6 are held together in a pump body by tie rods 7 forming holding means.
  • the bearing itself includes an inner carbide ring 8 of silicon and an outer ring 9 of silicon carbide, fixed to the body 6 and disposed opposite the inner ring 8 with a clearance forming a bearing.
  • the bearing further comprises according to the invention two jackets 10, 11 annular interposed between the shaft 2 and the inner ring 8 made of stainless steel.
  • the shirts 10.11 are threaded end to end at one end 12 and they are provided with the opposite end of a radial rim 13 going outwards.
  • the bearing is semi-floating, in the axis of the shaft and perpendicular to the tree.
  • each shirt In axial section, in a plane parallel to the axis of the shaft (figure 2), each shirt has an L shape with the shortest branch corresponds to edge 13.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The pump consists of vaned wheels (1) mounted on a shaft (2) and rotating together with it by means of a common bearing and an axial locking assembly, with the wheels located inside diffusers held together in a pump housing. The bearing comprises an inner ring (8) that rotates with the shaft and is made from silicon carbide, tungsten carbide or graphite, an outer ring (9) set with a clearance from the inner ring, and two sleeves (10, 11) of a material that is softer than the inner ring, e.g. of a metal such as stainless steel. Each sleeve has an outer radial rim (13) at one end, and they drive the inner ring through an elastic seal ring (15).

Description

Une pompe multicellulaire comprend un empilement de roues solidaires en rotation d'un arbre commun par l'intermédiaire d'au moins un palier. Chaque roue est insérée dans un diffuseur. Les diffuseurs sont maintenus ensemble en formant un corps de pompe fixe par des moyens de maintien qui sont habituellement des tirants. Le palier comprend une bague intérieure en un matériau ayant une première dureté, notamment en matériaux frittés, tels que des carbures ou en graphite. La bague intérieure est solidaire en rotation de l'arbre. Le palier comprend également une bague extérieure, habituellement en le même matériau de grande dureté, qui est fixée au corps et qui est disposée en regard de la bague intérieure avec un certain jeu.Multicell pump includes a stack of impellers integral in rotation with a common shaft by means of at least one bearing. Each wheel is inserted into a diffuser. The diffusers are held together by forming a fixed pump body by means of support which are usually tie rods. The bearing includes a ring interior of a material having a first hardness, in particular of sintered materials, such as carbides or graphite. The inner ring is integral in rotation with the shaft. The bearing also includes a ring outer, usually of the same material of great hardness, which is fixed to the body and which is arranged opposite the inner ring with a certain game.

Comme la bague intérieure et la bague extérieure tournent l'une par rapport à l'autre à grande vitesse allant jusqu'à 3500 tours à la minute, elles doivent être en un matériau de grande dureté pour qu'il n'y ait pas d'usure et que le coefficient de friction reste sensiblement constant. Les matériaux de ce genre d'une grande dureté sont nécessairement fragiles. Ils ne sont pas aptes à supporter de grandes contraintes mécaniques, alors pourtant qu'ils sont soumis à des contraintes de ce genre lorsqu'ils transmettent aux roues les forces appliquées par des moyens de serrage axial. Il se produit souvent une rupture de la bague intérieure qui fait que les roues sont libérées à l'intérieur du corps. Les roues viennent heurter les diffuseurs et se détruisent. Une simple rupture du palier entraíne ainsi la destruction totale de la pompe.As the inner ring and the outer ring rotate one compared to the other at high speed of up to 3500 rpm, they must be made of a material of great hardness so that there is no wear and the friction coefficient remains substantially constant. The such hard materials are necessarily fragile. They are not able to withstand great mechanical stresses, so yet they are subject to such constraints when they transmit the forces applied by clamping means to the wheels axial. There is often a rupture of the inner ring which causes the wheels are released inside the body. The wheels hit the diffusers and destroy themselves. A simple rupture of the bearing thus causes the total destruction of the pump.

Par le document EP 0667 456, on connaít une pompe centrifuge comportant un palier de bout d'arbre, comportant une bague intérieure solidaire en rotation de l'arbre, une bague extérieure en regard de la bague intérieure, une chemise annulaire interposée entre la bague intérieure et l'arbre et ayant un rebord à une extrémité.Document EP 0667 456 discloses a centrifugal pump having a shaft end bearing, having an inner ring integral in rotation with the shaft, an outer ring facing the ring inner, an annular jacket interposed between the inner ring and the tree and having a rim at one end.

Le palier comporte également une bague de serrage au bout de l'arbre.The bearing also has a clamping ring at the end of the tree.

Ce type de palier ne peut pas être utilisé comme palier intermédiaire dans une pompe multicellulaire.This type of bearing cannot be used as a bearing intermediate in a multicellular pump.

En outre, ce palier est mal lubrifié et un artifice supplémentaire doit être prévu, à savoir le labyrinthe (58') qui assure la présence de l'élément lubrifiant en aspirant à travers le palier une partie du liquide pompé suivant un sens de rotation (celui du labyrinthe). Il en résulte des températures de fonctionnement élevées et une usure rapide des bagues extérieure et intérieure. Il peut notamment résulter de cette usure un grippage de la pompe au niveau du rebord (72) de la chemise.In addition, this bearing is poorly lubricated and an additional device must be provided, namely the labyrinth (58 ') which ensures the presence of the element lubricant by sucking through the bearing part of the pumped liquid according to a direction of rotation (that of the labyrinth). This results in temperatures of high operation and rapid wear of the outer rings and interior. In particular, this wear could result in pump seizure at the rim (72) of the shirt.

L'invention remédie à ces inconvénients par un palier qui peut être utilisé aussi bien comme palier de bout que palier intermédiaire, qui est moins sujet à se détruire, plus facile à fabriquer, mieux lubrifié et qui, même lorsque la bague intérieure se grippe, conserve encore une certaine fonction de palier.The invention remedies these drawbacks by a bearing which can be used as an end bearing as well as an intermediate bearing, which is less subject to destruction, easier to manufacture, better lubricated and which, even when the inner ring seizes up, still retains a certain bearing function.

Suivant l'invention, le palier est tel que défini à la revendication 1.According to the invention, the bearing is as defined in claim 1.

Par cette constitution du palier en plusieurs parties, la bague intérieure conserve la fonction d'assurer la constance du coefficient de friction et de résistance à l'usure, mais elle n'a plus à assurer une résistance à la contrainte axiale due aux forces appliquées par les moyens de serrage axial, cette fonction étant prise en charge par les chemises qui, constituées en un matériau moins dur et donc moins fragile, peuvent mieux l'assumer. C'est ainsi, notamment, qu'alors que la bague intérieure et également la bague extérieure sont en carbure de silicium, en carbure de tungstène, en graphite ou autre matériau fritté, les chemises peuvent être en métal et sont notamment, de préférence, en inox. En outre, comme on n'a plus à rectifier la face intérieure et les deux faces frontales de la bague intérieure, sa fabrication est simplifiée. Enfin, si la bague intérieure se grippe, sans pouvoir tourner par rapport à la bague extérieure, elle a encore la possibilité de tourner par rapport aux chemises, ce qui assure un effet de palier au moins de secours. Même si la bague intérieure vient à se briser, l'effet de palier disparaít certes, mais les roues restent maintenues en place par les moyens de serrage. La pompe ne se détruit pas.By this constitution of the bearing in several parts, the ring interior retains the function of ensuring the consistency of the coefficient of friction and resistance to wear, but it no longer has to provide resistance to axial stress due to the forces applied by the axial clamping means, this function being supported by the shirts which, made up of a less hard and therefore less fragile material, can better assume it. It is so, in particular, that while the inner ring and also the ring outer are made of silicon carbide, tungsten carbide, graphite or other sintered material, the shirts may be made of metal and are in particular, preferably, stainless steel. Furthermore, since we no longer have to adjust the inner face and the two front faces of the inner ring, its manufacture is simplified. Finally, if the inner ring seizes, without being able to turn by compared to the outer ring, it still has the possibility of turning by compared to shirts, which provides a leveling effect at least of relief. Even if the inner ring breaks, the bearing effect certainly disappears, but the wheels remain held in place by the clamping means. The pump does not destroy itself.

De préférence, le moyen d'entraínement de la bague intérieure par les chemises est un moyen élastique en étant notamment un joint torique interposé entre les rebords radiaux et la bague intérieure. Cela permet de compenser d'une manière souple les tolérances de cote entre la bague intérieure et les chemises et prévient ainsi des ruptures de la bague intérieure.Preferably, the drive means of the inner ring by the shirts is an elastic means, in particular being an O-ring interposed between the radial flanges and the inner ring. This allows to flexibly compensate for dimensional tolerances between the ring inner and liners and thus prevents breakage of the inner ring.

De préférence, il est prévu un jeu entre les deux chemises et la bague intérieure. Preferably, a clearance is provided between the two shirts and the inner ring.

On obtient ainsi une plus grande souplesse de fonctionnement, permettant un mouvement latéral (perpendiculaire à l'axe de l'arbre) pendant le fonctionnement de la pompe.This gives greater operating flexibility, allowing lateral movement (perpendicular to the axis of the shaft) during pump operation.

La présente invention vise également une pompe multicellulaire ayant un palier suivant l'invention.The present invention also relates to a multicellular pump having a bearing according to the invention.

Au dessin annexé, donné uniquement à titre d'exemple :In the attached drawing, given solely by way of example:

La figure 1 est une vue partielle en coupe axiale d'une pompe suivant l'invention etFigure 1 is a partial view in axial section of a pump according to the invention and

La figure 2 est une vue à plus grande échelle du palier de la pompe de la figure 1.Figure 2 is an enlarged view of the bearing of the pump of figure 1.

La pompe multicellulaire représentée à la figure 1 comprend un empilement de roues 1, solidaire en rotation d'un arbre 2, les roues étant pincées entre des entretoises 3, l'arbre est commun à toutes les roues qui sont maintenues ensemble par des moyens de serrage en bout, comprenant successivement, de l'intérieur vers l'extérieur, une rondelle 4 et un écrou 5 indésserable. En serrant l'écrou, on serre les entretoises et on serre ainsi les roues 1 par l'intermédiaire également du palier qui sera décrit d'une manière plus précise plus bas. Chaque roue 1 est insérée dans un diffuseur 6. Les diffuseurs 6 sont maintenus ensemble en un corps de pompe par des tirants 7 formant moyens de maintien.The multicell pump shown in Figure 1 includes a stack of wheels 1, integral in rotation with a shaft 2, the wheels being pinched between spacers 3, the shaft is common to all the wheels which are held together by end clamping means, comprising successively, from the inside to the outside, a washer 4 and a nut 5 indésserable. By tightening the nut, we tighten the spacers and thus tighten the wheels 1 also via the bearing which will be described in a way more precise below. Each wheel 1 is inserted into a diffuser 6. The diffusers 6 are held together in a pump body by tie rods 7 forming holding means.

Le palier soi-même comprend une bague 8 intérieure en carbure de silicium et une bague 9 extérieure en carbure de silicium, fixée au corps 6 et disposée en regard de la bague 8 intérieure avec un jeu formant palier. Le palier comporte en outre suivant l'invention deux chemises 10, 11 annulaires interposées entre l'arbre 2 et la bague 8 intérieure en inox. Les chemises 10,11 sont enfilées bout à bout à une extrémité 12 et elles sont munies à l'extrémité opposée d'un rebord 13 radial allant vers l'extérieur. Entre les rebords 13 radiaux et les faces frontales 14 de la bague 8 intérieure sont interposés deux joints 15 toriques qui font que la bague 8 intérieure est entraínée par les chemises 10, 11 et est ainsi solidaire en rotation de l'arbre 2, puisque les chemises 10, 11 qui sont montées en tant qu'entretoises dans la chaíne des entretoises 3, tournent en même temps que l'arbre 2.The bearing itself includes an inner carbide ring 8 of silicon and an outer ring 9 of silicon carbide, fixed to the body 6 and disposed opposite the inner ring 8 with a clearance forming a bearing. The bearing further comprises according to the invention two jackets 10, 11 annular interposed between the shaft 2 and the inner ring 8 made of stainless steel. The shirts 10.11 are threaded end to end at one end 12 and they are provided with the opposite end of a radial rim 13 going outwards. Between the 13 radial edges and the front faces 14 of the inner ring 8 are interposed two O-rings 15 which make the inner ring 8 is driven by the liners 10, 11 and is thus secured in rotation with the shaft 2, since the shirts 10, 11 which are mounted as spacers in the chain of spacers 3, rotate at the same time as the shaft 2.

Il existe un jeu entre les deux chemises 10, 11 et la bague 8 intérieure. There is a play between the two shirts 10, 11 and the ring 8 interior.

Le palier est semi-flottant, dans l'axe de l'arbre et perpendiculairement à l'arbre.The bearing is semi-floating, in the axis of the shaft and perpendicular to the tree.

En coupe axiale, dans un plan parallèle à l'axe de l'arbre (figure 2), chaque chemise a une forme en L dont la branche la plus courte correspond au rebord 13.In axial section, in a plane parallel to the axis of the shaft (figure 2), each shirt has an L shape with the shortest branch corresponds to edge 13.

Claims (9)

Palier de pompe multicellulaire comprenant un empilement de roues (1) solidaires en rotation d'un arbre (2) par au moins un palier commun et maintenues ensemble par des moyens (4,5) de serrage axial, chaque roue (1) étant insérée dans un diffuseur (6), les diffuseurs (6) étant maintenus ensemble en un corps de pompe fixe par des moyens (7) de maintien, le palier comprenant : a) une bague (8) intérieure en un matériau ayant une première dureté et solidaire en rotation de l'arbre (2), b) une bague (9) extérieure fixée au corps et disposée en regard de la bague (8) intérieure avec jeu, c) une première chemise (10) annulaire interposée entre l'arbre (2) et la bague (8) intérieure en un matériau d'une dureté moindre que la première dureté et munie à une extrémité d'un rebord (13) radial allant vers l'extérieur,    caractérisé en ce que le palier comprend d) une deuxième chemise (11) en un matériau d'une dureté moindre que la première dureté et munie à une extrémité d'un rebord radial allant vers l'extérieur, les deux chemises (10, 11) étant enfilées bout à bout à leur extrémité opposée à l'extrémité où se trouve le rebord (13) radial, et e) un moyen (15) d'entraínement de la bague (8) intérieure par les chemises (10,11). Multicellular pump bearing comprising a stack of wheels (1) integral in rotation with a shaft (2) by at least one common bearing and held together by means (4,5) of axial clamping, each wheel (1) being inserted in a diffuser (6), the diffusers (6) being held together in a fixed pump body by means (7) for holding, the bearing comprising: a) an inner ring (8) made of a material having a first hardness and integral in rotation with the shaft (2), b) an outer ring (9) fixed to the body and disposed opposite the inner ring (8) with play, c) a first annular jacket (10) interposed between the shaft (2) and the inner ring (8) made of a material of less hardness than the first hardness and provided at one end with a radial rim (13) going outwards, characterized in that the bearing comprises d) a second jacket (11) made of a material of less hardness than the first hardness and provided at one end with a radial rim going towards the outside, the two shirts (10, 11) being threaded end to end their end opposite the end where the radial flange (13) is located, and e) a means (15) for driving the inner ring (8) by the shirts (10,11). Palier suivant la revendication 1, caractérisé en ce que le moyen d'entraínement est élastique.Bearing according to claim 1, characterized in that the drive means is elastic. Palier suivant la revendication 2, caractérisé en ce que le moyen d'entraínement est un joint (15) torique.Bearing according to claim 2, characterized in that the drive means is an O-ring (15). Palier suivant l'une des revendications précédentes, caractérisé en ce que la bague intérieure est en carbure de silicium, en carbure de tungstène ou en graphite. Bearing according to one of the preceding claims, characterized in that the inner ring is made of silicon carbide, tungsten carbide or graphite. Palier suivant l'une des revendications précédentes, caractérisé en ce que les chemises (10,11) sont en métal, notamment en inox.Bearing according to one of the preceding claims, characterized in that the liners (10,11) are made of metal, in particular stainless steel. Palier suivant l'une des revendications précédentes, caractérisé en ce qu'il existe un jeu entre les deux chemises (10, 11) et la bague (8) intérieure.Bearing according to one of the preceding claims, characterized in that there is play between the two liners (10, 11) and the inner ring (8). Palier suivant l'une des revendications précédentes, caractérisé en ce qu'en coupe axiale, chaque chemise a une forme en L dont la branche la plus courte correspond au rebord (13).Bearing according to one of the preceding claims, characterized in that in axial section, each jacket has an L-shape, the shortest branch of which corresponds to the flange (13). Pompe multicellulaire comprenant un empilement de roues solidaires en rotation d'un arbre (2) par au moins un palier intermédiaire suivant l'une des revendications 1 à 7.Multistage pump comprising a stack of impellers integral in rotation with a shaft (2) by at least one intermediate bearing according to one of claims 1 to 7. Pompe multicellulaire comprenant un empilement de roues solidaires en rotation d'un arbre (2) par au moins un palier de bout suivant l'une des revendications 1 à 7.Multistage pump comprising a stack of impellers integral in rotation with a shaft (2) by at least one following end bearing one of claims 1 to 7.
EP03290029A 2002-01-24 2003-01-07 Floating pump bearing Withdrawn EP1331399A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0200867A FR2835020B1 (en) 2002-01-24 2002-01-24 MULTI-CELL PUMP WITH SEMI-FLOATING BEARING
FR0200867 2002-01-24

Publications (1)

Publication Number Publication Date
EP1331399A1 true EP1331399A1 (en) 2003-07-30

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EP03290029A Withdrawn EP1331399A1 (en) 2002-01-24 2003-01-07 Floating pump bearing

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EP (1) EP1331399A1 (en)
FR (1) FR2835020B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1596069A3 (en) * 2004-05-10 2010-12-29 Hitachi Industries Co., Ltd. Pump device
CN105317729A (en) * 2014-08-04 2016-02-10 威乐(中国)水泵系统有限公司 Sliding bearing and multi-stage centrifugal pump
CN108757544A (en) * 2018-04-16 2018-11-06 广东永力泵业有限公司 Tungsten carbide sliding bearing housing and water pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492605A1 (en) * 1990-12-27 1992-07-01 Ebara Corporation Shaft sleeve made of ceramics
EP0667456A1 (en) * 1994-02-11 1995-08-16 A. Ahlstrom Corporation Centrifugal pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0492605A1 (en) * 1990-12-27 1992-07-01 Ebara Corporation Shaft sleeve made of ceramics
EP0667456A1 (en) * 1994-02-11 1995-08-16 A. Ahlstrom Corporation Centrifugal pump

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1596069A3 (en) * 2004-05-10 2010-12-29 Hitachi Industries Co., Ltd. Pump device
CN105317729A (en) * 2014-08-04 2016-02-10 威乐(中国)水泵系统有限公司 Sliding bearing and multi-stage centrifugal pump
CN108757544A (en) * 2018-04-16 2018-11-06 广东永力泵业有限公司 Tungsten carbide sliding bearing housing and water pump

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Publication number Publication date
FR2835020B1 (en) 2004-10-08
FR2835020A1 (en) 2003-07-25

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