EP0172102B1 - Multistage pump with dismountable cartridge - Google Patents

Multistage pump with dismountable cartridge Download PDF

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Publication number
EP0172102B1
EP0172102B1 EP85401591A EP85401591A EP0172102B1 EP 0172102 B1 EP0172102 B1 EP 0172102B1 EP 85401591 A EP85401591 A EP 85401591A EP 85401591 A EP85401591 A EP 85401591A EP 0172102 B1 EP0172102 B1 EP 0172102B1
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EP
European Patent Office
Prior art keywords
screws
motor
cartridge
shaft
pump
Prior art date
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Expired
Application number
EP85401591A
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German (de)
French (fr)
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EP0172102A1 (en
Inventor
Roland Brunel
Jean-Claude Peu
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Wilo Salmson France SAS
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Pompes Salmson SAS
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Application filed by Pompes Salmson SAS filed Critical Pompes Salmson SAS
Publication of EP0172102A1 publication Critical patent/EP0172102A1/en
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Expired legal-status Critical Current

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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
    • 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
    • F04D1/066—Multi-stage pumps of the vertically split casing type the casing consisting of a plurality of annuli bolted together

Definitions

  • the present invention relates to a multicellular centrifugal pump mounted on a pump body between this body and a drive motor and comprising cells each equipped with a centrifugal turbine and a static part formed by a diffuser and channels, these cells being stacked on a pump shaft with a bearing for this shaft which is connected to a drive motor by a coupling, the stacked cells being surrounded by an annular envelope, providing an annular channel for discharging the pump liquid, and being mounted vertically on a pump body having suction and discharge ports.
  • Document DE-C-832 854 describes a multicellular pump where the cells are assembled by tie rods to suction and discharge pipes as well as to ball end bearings protected against liquid leakage by supports of sealing.
  • This arrangement of the pump allows its interchangeable coupling to the suction and discharge pipes as well as to a drive motor but does not allow this assembly to be inserted between a pump body located at the bottom and a drive motor. located in the upper part, according to the arrangement most generally used for common multi-stage pumps of medium power.
  • a multicellular centrifugal pump is arranged vertically between a lower body provided with a fluid inlet and outlet and respectively an upper body located on the side of the drive motor. Tie rods seem to connect the upper body to the lower body, and so that in order to exchange the hydraulic assembly of this pump, it is necessary to disconnect not only the motor coupling but also the suction and repression.
  • the present invention specifically aims to allow, in case of replacement of the hydraulic assembly of the pump, easy disassembly of this hydraulic assembly without having to intervene on the circuit of the suction and discharge lines of the pump.
  • the present invention relates to a multicellular pump which is characterized mainly by the fact that the hydraulic and mechanical elements of the pump are included in a removable cartridge, on the one hand on the side of the drive shaft, on the other hand on the side of the circuit of the fluid to be pumped.
  • the stacked cells form, with the envelope, the shaft and a sealing system for this shaft, a cartridge of hydraulic assembly, this cartridge being made in one piece by a set of tie rods connecting a flange greater than a lower flange provided with a suction flange and an annular delivery chamber, and the monobloc cartridge is fixed with interposition of seals and easily interchangeably, on the one hand on the side of the motor shaft by screws cooperating with the upper flange and on the other hand, on the side of the pump body by screws or bolts fixing the lower flange to the pump body.
  • the monobloc cartridge comprises at its upper part, around a motor coupling device, a lantern which allows access to the sealing system, which is connected to the upper flange by screws and which carries a motor centering flange fixed by screws, so that after release of the coupling, motor fixing screws on the centering flange, lifting the motor above the lantern and releasing the screws or fixing bolts on the pump body, the monobloc cartridge can be released and replaced by another in working order.
  • the motor centering flange is fixed to the lantern by screws.
  • a vertical multicellular pump of the centrifugal type mainly comprising a motor 1 coupled by a device 2 to a hydraulic assembly 3.
  • the pump is mounted on a circuit of fluid to be pumped comprising mainly a suction pipe 8 and a discharge line 9.
  • the motor shaft 4 is coupled by means of a coupling device 6 to the shaft 5 of the pump itself.
  • the hydraulic and mechanical elements are contained in several successive stages established along the pump shaft 5.
  • hydraulic element at least one cell like that 7a shown in the figure. It comprises a centrifugal turbine 12 and a static part formed by the diffuser 30 and channels 31.
  • mechanical element is meant, for example, the cell 7b which comprises a support 13 and a bearing for guiding the shaft 5, composed of a jacket 14 and a pad 15 secured to the support 13. It is mainly these hydraulic and mechanical elements which are subject to wear or deterioration due to conditions of use which may cause degradation, disturbance or stoppage.
  • the assembly is made in one piece by a plurality of tie rods 17 which attach the lower flange 19 to the rest of the cartridge.
  • the tie rod 17 connects the two end flanges.
  • the cartridge can also take the form of a cartridge 3b, cartridge 3 to which a lantern 2 has been added which gives access to the sealing device 23. It can also be associated with a centering flange 32 of the cartridge 3b on motor 1.
  • the lantern 2 is linked to the upper flange 24 by screws 27 and the centering flange 32 to the lantern 2 by screws 33.
  • the cartridge 3b is therefore mounted on the motor 1 by screws 38.
  • the cartridge To seal the cartridge, it has seals 35, 37 disposed between the flange 19 and the cartridge body 16 and an O-ring 39 disposed between the flange 19 and the pump body 20.
  • the diameter of the housing of the pump body 20 which receives the seal 39 is indicated by D.
  • the sealing device 23 makes it possible to prevent the pumping liquid from rising up along the shaft towards the coupling device.
  • the pump is mounted on a pump body of the "in line" type where the suction 8 and discharge 9 ports are aligned and at the same level.
  • the suction pipe 8 of the pump body communicates with a suction flange 10 connected, at the foot of the shaft 5, to the first hydraulic element 7a.
  • the pumped fluid is sucked up and goes up along the shaft 5 in the succession of stacked cells before finally falling back into an annular channel 11 disposed between the outer envelope 16 of the cartridge and the cylindrical surface 26 formed by the stacking of cells .
  • the pumping liquid enters an annular delivery chamber 22 which communicates with the delivery pipe 9.
  • the fixing between the flange 19 and the pump body 20 is carried out by several bolts 18.

Description

La présente invention concerne une pompe centrifuge multicellulaire montée sur un corps de pompe entre ce corps et un moteur d'entraînement et comportant des cellules équipées chacune d'une turbine centrifuge et d'une partie statique formée d'un diffuseur et de canaux, ces cellules étant empilées sur un arbre de pompe avec un palier pour cet arbre qui est relié à un moteur d'entraînement par un accouplement, les cellules empilées étant entourées d'une enveloppe annulaire, ménageant un canal annulaire de refoulement du liquide pompe, et étant montées verticalement sur un corps de pompe présentant des orifices d'aspiration et de refoulement.The present invention relates to a multicellular centrifugal pump mounted on a pump body between this body and a drive motor and comprising cells each equipped with a centrifugal turbine and a static part formed by a diffuser and channels, these cells being stacked on a pump shaft with a bearing for this shaft which is connected to a drive motor by a coupling, the stacked cells being surrounded by an annular envelope, providing an annular channel for discharging the pump liquid, and being mounted vertically on a pump body having suction and discharge ports.

Dans l'art antérieur, il est connu de réaliser des pompes constituées par un empilement de cellules de pompage. Sur un arbre de pompe commun, plusieurs cellules comportant des éléments hydrauliques et mécaniques sont empilés les uns à la suite des autres. L'ensemble est accouplé à un arbre moteur par un dispositif d'accouplement. En cas de panne ou encore en cas de changement de caractéristiques de pompage, on est contraint de démonter, sur l'installation en place, chacun des éléments de la pompe que l'on doit remplacer. Les temps d'intervention sont longs, coûteux et immobilisent l'installation sans pompage pendant un temps qui peut être important.In the prior art, it is known to produce pumps constituted by a stack of pumping cells. On a common pump shaft, several cells comprising hydraulic and mechanical elements are stacked one after the other. The assembly is coupled to a motor shaft by a coupling device. In the event of a breakdown or in the event of a change in pumping characteristics, it is forced to dismantle, on the installation in place, each of the elements of the pump that must be replaced. Intervention times are long, expensive and immobilize the installation without pumping for a time which can be significant.

Le document DE-C-832 854 décrit une pompe multicellulaire où les cellules sont assemblées par des tirants à des canalisations d'aspiration et de refoulement ainsi qu'à des paliers d'extrémité à billes protégés contre les fuites de liquide par des supports d'étanchéité. Cette disposition de la pompe permet son accouplement interchangeable aux canalisations d'aspiration et de refoulement ainsi qu'à un moteur d'entraînement mais ne permet pas d'intercaler cet ensemble entre un corps de pompe situé en partie basse et un moteur d'entraînement situé en partie haute, selon la disposition la plus généralement utilisée pour les pompes multicellulaires courantes de puissance moyenne.Document DE-C-832 854 describes a multicellular pump where the cells are assembled by tie rods to suction and discharge pipes as well as to ball end bearings protected against liquid leakage by supports of sealing. This arrangement of the pump allows its interchangeable coupling to the suction and discharge pipes as well as to a drive motor but does not allow this assembly to be inserted between a pump body located at the bottom and a drive motor. located in the upper part, according to the arrangement most generally used for common multi-stage pumps of medium power.

Selon le document GB-A-2013279, une pompe centrifuge multicellulaire est disposée verticalement entre un corps inférieur muni d'une entrée et d'une sortie de fluide et respectivement un corps supérieur situé du côté du moteur d'entraînement. Des tirants paraissent relier le corps supérieur au corps inférieur, et sorte que pour procéder à l'échange de l'ensemble hydraulique de cette pompe, il est nécessaire de déconnecter non seulement l'accouplement du moteur mais aussi les conduites d'aspiration et de refoulement.According to document GB-A-2013279, a multicellular centrifugal pump is arranged vertically between a lower body provided with a fluid inlet and outlet and respectively an upper body located on the side of the drive motor. Tie rods seem to connect the upper body to the lower body, and so that in order to exchange the hydraulic assembly of this pump, it is necessary to disconnect not only the motor coupling but also the suction and repression.

La présente invention a précisément pour but de permettre, en cas de remplacement de l'ensemble hydraulique de la pompe, le démontage aisé de cet ensemble hydraulique sans avoir à intervenir sur le circuit des conduites d'aspiration et de refoulement de la pompe.The present invention specifically aims to allow, in case of replacement of the hydraulic assembly of the pump, easy disassembly of this hydraulic assembly without having to intervene on the circuit of the suction and discharge lines of the pump.

Afin de porter remède aux inconvénients de l'art antérieur, la présente invention concerne une pompe multicellulaire qui se caractérisé principalement par le fait que les éléments hydrauliques et mécaniques de la pompe sont inclus dans une cartouche démontable, d'une part du côté de l'arbre d'entraînement, d'autre part du côté du circuit du fluide à pomper.In order to remedy the drawbacks of the prior art, the present invention relates to a multicellular pump which is characterized mainly by the fact that the hydraulic and mechanical elements of the pump are included in a removable cartridge, on the one hand on the side of the drive shaft, on the other hand on the side of the circuit of the fluid to be pumped.

Selon l'invention, les cellules empilées forment, avec l'enveloppe, l'arbre et un système d'étanchéité pour cet arbre, une cartouche d'ensemble hydraulique, cette cartouche étant rendue monobloc par un ensemble de tirants reliant un flasque supérieur à un flasque inférieur muni d'un flasque d'aspiration et d'une chambre annulaire de refoulement, et la cartouche monobloc est fixée avec interposition de joints et de façon aisément interchangeable, d'une part du côté de l'arbre du moteur par des vis coopérant avec le flasque supérieur et d'autre part, du côté du corps de pompe par des vis ou boulons fixant le flasque inférieur sur le corps de pompe.According to the invention, the stacked cells form, with the envelope, the shaft and a sealing system for this shaft, a cartridge of hydraulic assembly, this cartridge being made in one piece by a set of tie rods connecting a flange greater than a lower flange provided with a suction flange and an annular delivery chamber, and the monobloc cartridge is fixed with interposition of seals and easily interchangeably, on the one hand on the side of the motor shaft by screws cooperating with the upper flange and on the other hand, on the side of the pump body by screws or bolts fixing the lower flange to the pump body.

Selon un autre mode de réalisation, la cartouche monobloc comporte à sa partie supérieure, autour d'un dispositif d'accouplement au moteur, une lanterne qui permet d'accéder au système d'étanchéité, qui est reliée au flasque supérieur par des vis et qui porte une bride de centrage du moteur fixé par des vis, de telle manière qu'après libération de l'accouplement, des vis de fixation du moteur sur la bride de centrage, levage du moteur au-dessus de la lanterne et libération des vis ou boulons de fixation sur le corps de pompe, la cartouche monobloc puisse être dégagée et remplacée par une autre en état de marche. La bride de centrage du moteur est fixé sur la lanterne par des vis.According to another embodiment, the monobloc cartridge comprises at its upper part, around a motor coupling device, a lantern which allows access to the sealing system, which is connected to the upper flange by screws and which carries a motor centering flange fixed by screws, so that after release of the coupling, motor fixing screws on the centering flange, lifting the motor above the lantern and releasing the screws or fixing bolts on the pump body, the monobloc cartridge can be released and replaced by another in working order. The motor centering flange is fixed to the lantern by screws.

D'autres caractéristiques et avantages apparaîtront à la lecture de la description et de la figure unique annexée.Other characteristics and advantages will appear on reading the description and the attached single figure.

A la figure, on a représenté une pompe multicellulaire verticale du type centrifuge comprenant principalement un moteur 1 accouplé par un dispositif 2 à un ensemble hydraulique 3. La pompe est montée sur un circuit de fluide à pomper comportant principalement une canalisation d'aspiration 8 et une canalisation de refoulement 9. L'arbre moteur 4 est accouplé au moyen d'un dispositif d'accouplement 6 à l'arbre 5 de la pompe elle-même.In the figure, there is shown a vertical multicellular pump of the centrifugal type mainly comprising a motor 1 coupled by a device 2 to a hydraulic assembly 3. The pump is mounted on a circuit of fluid to be pumped comprising mainly a suction pipe 8 and a discharge line 9. The motor shaft 4 is coupled by means of a coupling device 6 to the shaft 5 of the pump itself.

Les éléments hydrauliques et mécaniques sont contenus dans plusieurs étages successifs établis le long de l'arbre de pompe 5.The hydraulic and mechanical elements are contained in several successive stages established along the pump shaft 5.

Par élément hydraulique, on entend au moins une cellule comme celle 7a représentée à la figure. Elle comporte une turbine centrifuge 12 et une partie statique formée du diffuseur 30 et de canaux 31. Par élément mécanique, on entend par exemple la cellule 7b qui comporte un support 13 et un palier de guidage de l'arbre 5, composé d'une chemise 14 et d'un coussinet 15 solidaire du support 13. Ce sont principalement ces éléments hydrauliques et mécaniques qui sont sujets à usure ou à détérioration dues à des conditions d'emploi pouvant entraîner des dégradations, des perturbations ou des arrêts.By hydraulic element is meant at least one cell like that 7a shown in the figure. It comprises a centrifugal turbine 12 and a static part formed by the diffuser 30 and channels 31. By mechanical element is meant, for example, the cell 7b which comprises a support 13 and a bearing for guiding the shaft 5, composed of a jacket 14 and a pad 15 secured to the support 13. It is mainly these hydraulic and mechanical elements which are subject to wear or deterioration due to conditions of use which may cause degradation, disturbance or stoppage.

Dans l'art antérieur, il fallait alors une intervention de démontage complet de la pompe pour procéder à sa remise en état.In the prior art, an intervention was then required. complete disassembly of the pump to carry out its repair.

Selon l'invention, la cartouche 3 est constituée essentiellement:

  • - de l'arbre 5 équipé d'un système d'étanchéité 23,
  • - d'un fla_-!ue d'extrémité inférieure 19, dit de fermeture,
  • - d'un flasque d'extrémité supérieure 24.
According to the invention, the cartridge 3 essentially consists:
  • - the shaft 5 fitted with a sealing system 23,
  • - a fla _-! ue lower end 19, said closing,
  • - an upper end flange 24.

L'ensemble est rendu monobloc par une pluralité de tirants 17 qui rattachent le flasque inférieur 19 au reste de la cartouche. Ici, le tirant 17 relie les deux flasques d'extrémité. Mais, la cartouche peut prendre aussi la forme d'une cartouche 3b, cartouche 3 à laquelle on a rajouté une lanterne 2 qui permet d'accéder au dispositif d'étanchéité 23. On peut y associer aussi une bride de centrage 32 de la cartouche 3b sur le moteur 1.The assembly is made in one piece by a plurality of tie rods 17 which attach the lower flange 19 to the rest of the cartridge. Here, the tie rod 17 connects the two end flanges. However, the cartridge can also take the form of a cartridge 3b, cartridge 3 to which a lantern 2 has been added which gives access to the sealing device 23. It can also be associated with a centering flange 32 of the cartridge 3b on motor 1.

La lanterne 2 est lié au flasque supérieur 24 par des vis 27 et la bride de centrage 32 à la lanterne 2 par des vis 33. La cartouche 3b est donc montée sur le moteur 1 par des vis 38.The lantern 2 is linked to the upper flange 24 by screws 27 and the centering flange 32 to the lantern 2 by screws 33. The cartridge 3b is therefore mounted on the motor 1 by screws 38.

Cette constitution permet en particulier des interventions globales sur la pompe en dehors du moteur. Ainsi tout changement de pompe peut être réalisé par un opérateur non spécialisé en une opération sur le site de difficulté technique très simple ne durant que très peu de temps ce qui réduit le coût d'immobilisation de la pompe. On réduit aussi le coût d'intervention. La constitution en une cartouche globale et stockable des éléments hydraulique et mécaniques permet d'éviter l'usage d'un groupe de secours complet prévu en réserve. On évite aussi la gestion d'un ensemble de pompes compliquée car on n'a plus à gérer un grand nombre de pièces de rechange comme c'était le cas selon l'art antérieur. Il est aussi possible de personnaliser chaque application par un simple changement de cartouche sur le site. Ainsi les impulseurs et les parties fixes peuvent être réalisées aussi bien en matière synthétique qu'en acier inox, par exemple. Les caractéristiques de pompage changent selon le matériau et la forme des éléments hydrauliques et mécaniques.This constitution allows in particular global interventions on the pump outside the engine. Thus any change of pump can be carried out by an operator not specialized in an operation on the site of very simple technical difficulty lasting only a very short time which reduces the cost of immobilizing the pump. We also reduce the cost of intervention. The constitution of a global and storable cartridge of hydraulic and mechanical elements makes it possible to avoid the use of a complete backup group provided in reserve. It also avoids the management of a complicated set of pumps because one no longer has to manage a large number of spare parts as was the case according to the prior art. It is also possible to customize each application by simply changing the cartridge on the site. Thus the impellers and the fixed parts can be made both of synthetic material and of stainless steel, for example. The pumping characteristics change according to the material and the shape of the hydraulic and mechanical elements.

Pour assurer l'étanchéité de la cartouche celle-ci comporte des joints d'étanchéité 35, 37 disposés entre le flasque 19 et le corps de cartouche 16 et un joint torique 39 disposé entre le flasque 19 et le corps de pompe 20. Le diamètre du logement du corps de pompe 20 qui reçoit le joint 39 est indiqué par D. Le dispositif d'étanchéité 23 permet d'éviter la remontée du liquide de pompage le long de l'arbre vers le dispositif d'accouplement. Dans l'exemple de réalisation préféré, la pompe est montée sur un corps de pompe du type «in line» où les orifices d'aspiration 8 et de refoulement 9 sont alignés et au même niveau. La canalisation d'aspiration 8 du corps de pompe communique avec un flasque d'aspiration 10 relié, au pied de l'arbre 5, au premier élément hydraulique 7a. Le lequide pompé est aspiré et remonte le long de l'arbre 5 dans la succession de cullules empilées pour finalement retomber dans un canal annulaire 11 disposé entre l'enveloppe extérieure 16 de la cartouche et la surface cylindrique 26 constituée per l'empilement des cellules. Le liquide de pompage pénètre dans une chambre annulaire de refoulement 22 qui communique avec la canalisation 9 de refoulement. La fixation entre le flasque 19 et le corps de pompe 20 est réalisée par plusieurs boulons 18.To seal the cartridge, it has seals 35, 37 disposed between the flange 19 and the cartridge body 16 and an O-ring 39 disposed between the flange 19 and the pump body 20. The diameter of the housing of the pump body 20 which receives the seal 39 is indicated by D. The sealing device 23 makes it possible to prevent the pumping liquid from rising up along the shaft towards the coupling device. In the preferred embodiment, the pump is mounted on a pump body of the "in line" type where the suction 8 and discharge 9 ports are aligned and at the same level. The suction pipe 8 of the pump body communicates with a suction flange 10 connected, at the foot of the shaft 5, to the first hydraulic element 7a. The pumped fluid is sucked up and goes up along the shaft 5 in the succession of stacked cells before finally falling back into an annular channel 11 disposed between the outer envelope 16 of the cartridge and the cylindrical surface 26 formed by the stacking of cells . The pumping liquid enters an annular delivery chamber 22 which communicates with the delivery pipe 9. The fixing between the flange 19 and the pump body 20 is carried out by several bolts 18.

Pour la maintenance de la pompe multicellulaire selon l'invention, il est nécessaire dans un premier temps de libérer le dispositif d'accouplement 6 qui lie l'arbre 5 à l'arbre moteur 4. Puis, dans un deuxième temps dans le cas où la cartouche est du genre 3b, on libère les liaisons bride de centrage 32 - moteur 1 par manoeuvre des vis 33 et flasque intérieur 19 - corps de pompe 20 par manoeuvre des vis 18. Par simple levage du bloc moteur 1 - dispositif d'accouplement 6, il est possible alors de dégager la cartouche 3b qui peut être à ce moment là renvoyée pour les réparations d'usage ou pour un simple changement de cartouche.For the maintenance of the multicellular pump according to the invention, it is necessary firstly to release the coupling device 6 which connects the shaft 5 to the motor shaft 4. Then, in a second step in the case where the cartridge is of the type 3b, the centering flange 32 connections are released - motor 1 by operation of the screws 33 and inner flange 19 - pump body 20 by operation of the screws 18. By simple lifting of the engine block 1 - coupling device 6, it is then possible to release the cartridge 3b which can then be returned for the usual repairs or for a simple cartridge change.

Claims (3)

1. Multistage centrifugal pump mounted on a pump body (20) between this body and a driving motor (1) and comprising cells (7a, 7b) each equipped with a centrifugal impeller (12) and a static part formed of a diffuser (30) and channels (31); these cells being stacked on a pump shaft (5) with a bearing (14, 15) for this shaft which is connectrd to the driving motor (1) by a coupling (6), the stacked cells (7a, 7b) being surrounded by an annular shell (16) providing an annular discharge channel (11) for the pumped liquid, and being vertically mounted on a pump body (20) presenting suction (8) and discharge (9) orifices, characterized in that the stacked cells form, with the shell (16), the shaft (5) and a sealing system (23) for this shaft, a hydraulic assembly cartridge, this cartridge being rendered single-piece by an assembly of tie-rods (17) connecting an upper flange (24) to a lower flange (19) provided with a suction flange (10) and an annular discharge chamber (22) and in that the single-piece cartridge (3) is secured with interposition of sealings (39) and easily interchangeable, on the one hand on the side of the shaft (4) of the motor (1) by screws (27) cooperating with the upper flange (24) and on the other hand, on the side of the pump body (20) by screws or bolts (18) securing the lower flange (19) onto the pump body (20).
2. Centrifugal pump according to claim 1, characterized in that the single-piece cartridge (3b) comprises on its upper portion, around a coupling device (6) to the motor (1), a window (2) which allows access to the sealing system (23), which is connected to the upper flange (24) by screws (27) and which carries a centering collar (32), of the motor (1) secured by screws (38) whereby after release of the coupling (6), the screws (38) securing to the motor on the centering collar (32), raising of the motor (1) above the window (2) and releasing the screws or bolts (18) for securing on the pump body (20), the single-piece cartridge can be disengaged and replaced by another one in good working order.
3. Centrifugal pump according to claim 2, characterized in that the centering collar (32) of the motor (1) il secured onto the window (2) by screws (33).
EP85401591A 1984-08-03 1985-08-02 Multistage pump with dismountable cartridge Expired EP0172102B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8412336 1984-08-03
FR8412336A FR2568636B1 (en) 1984-08-03 1984-08-03 MULTICELLULAR PUMP WITH REMOVABLE CARTRIDGE

Publications (2)

Publication Number Publication Date
EP0172102A1 EP0172102A1 (en) 1986-02-19
EP0172102B1 true EP0172102B1 (en) 1989-01-18

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85401591A Expired EP0172102B1 (en) 1984-08-03 1985-08-02 Multistage pump with dismountable cartridge

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US (1) US4669956A (en)
EP (1) EP0172102B1 (en)
DE (1) DE3567703D1 (en)
FR (1) FR2568636B1 (en)

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Also Published As

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FR2568636A1 (en) 1986-02-07
US4669956A (en) 1987-06-02
FR2568636B1 (en) 1989-01-06
DE3567703D1 (en) 1989-02-23
EP0172102A1 (en) 1986-02-19

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