EP0296952A1 - Selfpriming centrifugal pump for dangerous liquids particularly radio-active liquids - Google Patents

Selfpriming centrifugal pump for dangerous liquids particularly radio-active liquids Download PDF

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Publication number
EP0296952A1
EP0296952A1 EP88401531A EP88401531A EP0296952A1 EP 0296952 A1 EP0296952 A1 EP 0296952A1 EP 88401531 A EP88401531 A EP 88401531A EP 88401531 A EP88401531 A EP 88401531A EP 0296952 A1 EP0296952 A1 EP 0296952A1
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EP
European Patent Office
Prior art keywords
groove
pump
wheel
hole
partition
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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.)
Granted
Application number
EP88401531A
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German (de)
French (fr)
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EP0296952B1 (en
Inventor
Jacques Dollfus
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Societe Generale pour les Techniques Nouvelles SA SGN
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Societe Generale pour les Techniques Nouvelles SA SGN
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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
    • F04D9/00—Priming; Preventing vapour lock
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/605—Mounting; Assembling; Disassembling specially adapted for liquid pumps
    • F04D29/606—Mounting in cavities

Definitions

  • the pump described in this patent externally comprises a bowl on which are welded the suction and discharge pipes and an internal hydraulic part which is arranged (with sealing) in said bowl and which can be dismantled vertically under protection.
  • the present invention is a pump whose configuration is that described in said French patent but which offers a different internal hydraulic part in particular better suited to the transfer of liquids with low flow rates (for example of the order of 2 m3 / h).
  • the present invention therefore relates to a vertical self-priming centrifugal pump, placed under a concrete slab, consisting of a fixed bowl welded to suction and discharge pipes and fixed under said slab and an internal hydraulic part arranged in a sealed manner.
  • said hydraulic part consists of a wheel (13) with radial fins driven by a drive shaft passing through said slab, said wheel rotating between a lower plate (14) provided with a suction hole and an upper partition (20) forming the bottom of a chamber (12) and hollowed out, on the wheel side, with an oval groove (23) going around said partition, said groove being closed to the one of its ends and terminated by a hole (21) at the other of its ends, said hole allowing the evacuation of the liquid.
  • Cell 2 containing dangerous products is inaccessible to personnel while cell 1 is intended to remain clean and accessible.
  • the pump 4 is placed in the lower cell while the drive motor 7 is located in the cell 1.
  • the assembly of the motor comprises a lantern 8, the motor shaft 6 and a bearing box 5.
  • a coupling is placed between the motor and the shaft.
  • the pump consists of an external bowl with tubing, a removable equipment, a rotating hydraulic equipment, ball bearings, fixed seals, rotating seals.
  • the pump therefore consists of a bowl 15, of generally cylindrical shape, the upper part of which, open, forms a collar fixed to the concrete slab 3 and the lower part of which is closed.
  • the bowl has three welded pipes (and welded to the pipes): a suction pipe 18, a delivery pipe 24 and a ventilation pipe (not shown).
  • the suction pipe is welded to the pipe bringing the fluid to be pumped.
  • the discharge pipe is welded to the piping bringing the pumped liquid.
  • the ventilation pipe is connected to a general ventilation system.
  • the bowl should be considered as fixed and constituting a whole with the pipes.
  • this part is extractable and comprises a rotating assembly and a movable assembly (the mobile adjective being there to remind that said movable assembly is extractable but, in the operation of the pump, said movable assembly is of course fixed).
  • the rotating assembly is shown, mounted in the bowl, in FIG. 2 and in exploded view for the impeller in FIG. 3.
  • FIGS. 2, 3, 4, 5 and 6 we can also see the mobile assembly which, with a few details, presents itself as a part of revolution around the axis of the motor shaft 6 (vertical).
  • the upper part of the movable assembly comprises flat parts which, being supported on corresponding flat parts of the bowl, make it possible to ensure sealing by means of two seals 30 and 32 (FIG. 5).
  • the lower part of the moving assembly forms a cylindrical box bounded laterally by a wall 11, downwards by the removable base plate 14 (held in place by screws 33 - Figure 6) pierced with an orifice provided with the nozzle 16 and upwards by a plate 10 perforated with holes 29.
  • the central part of this movable assembly surrounds the motor shaft 6, obviously leaving the necessary space for the seal (s) 9.
  • a horizontal partition 20 which separates the interior of the box into two parts, a lower part which will contain the impeller 13 and a high part (12 figure 7) forming a delivery chamber.
  • Said partition 20 therefore delimits the lower chamber in which the impeller 13 is arranged; this partition and the role it plays in the invention are described below with particular reference to FIGS. 4 and 6.
  • This partition has the shape of a thick circular disc hollowed out of a groove 23 on the underside. (It is recalled that Figure 4 shows the partition turned over to allow the groove to be seen).
  • the groove ends with a hole 21 passing through the partition 20.
  • a small plate 17 separates the two holes 21 and 22.
  • the groove 23 is surrounded by a flat part 35.
  • Figure 6 shows that the groove 23 has the shape of a half-oval and for example of a "basket handle”.
  • the radius Rm of the hub 34 of the impeller 13 must be significantly smaller than the inner radius Ri of the groove.
  • Figure 6 shows that there is a clearance between the impeller 13 and the partition 20 on the one hand and the base plate 14 on the other hand. This play must allow the free rotation of the wheel, but be weak enough for the capillary forces to ensure a seal on both sides of the impeller.
  • a play of 0.1 mm can be proposed as a preferred value.
  • a joint can be placed between the wall 11 and the boss 39 of the bowl or, in a preferred manner, metal segments 38 can be placed in grooves 36, 37 of the wall 11.
  • the segments are preferably 2 in number.
  • the plate 17 separating the two holes prevents the emulsion from falling through the hole 22 before the water-air separation.
  • the same cycle is repeated until all the air from the suction line has been evacuated to the discharge.
  • the liquid to be sucked then fills the pump which takes its normal hydraulic speed as a peripheral channel pump.
  • the suction is sucked into the bottom of the bowl through the tube 16, it is discharged through the hole 21 in the chamber 12 and then through the holes 29 in the discharge chamber 12 ′ and the discharge nozzle 24.
  • the dimensions and characteristics of one of the pumps that can be produced according to the invention will be mentioned: - 90 mm diameter impeller; 10 mm thick and comprising 24 fins; - speed of rotation of the motor shaft 2 900 rpm; with said pump and by pumping cold water the level of which is located 6.5 m below the pump, a flow rate of 1,500 l / h is ensured if the water delivery level is at 46 m and 2,000 l / h if the delivery level is 25 m.

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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 present invention relates to a vertical, self-priming centrifugal pump located under a protective slab comprising a fixed bowl welded to the intake and delivery pipework and movable fittings removable through the top, characterised in that the hydraulic section comprises a wheel 13 with radial vanes driven by an engine shaft, that the said wheel turns between a bottom plate 14 provided with an intake hole and an upper bulkhead 20 hollowed out on the wheel side, an oval recess 23 ending in a hole 21 allowing the liquid to flow out. <IMAGE>

Description

Les transferts de liquides dangereux, notamment de liquides radioactifs, entre deux récipients (réservoirs, appareils, etc.), l'un étant un récipient bas et l'autre un récipient haut, au moyen d'une pompe, requièrent des précautions particulières à savoir :

  • a) la pompe doit être placée au-dessus du récipient bas, une avarie sur la pompe conduisant à une fuite n'amène pas à répandre tout le liquide du récipient,
  • b) la canalisation de refoulement ne doit pas plonger dans le liquide du récipient haut, un arrêt de la pompe ou une fuite ne doit pas siphonner le contenu du récipient haut,
  • c) la pompe doit être démontable sans interrompre la canali­sation entre les deux récipients,
  • d) quand la pompe est utilisée, plus spécialement sur des liquides radioactifs, on peut prévoir de placer les deux récipients, la pompe et les canalisations dans une "cellule".
Transfers of dangerous liquids, in particular radioactive liquids, between two containers (tanks, devices, etc.), one being a low container and the other a high container, by means of a pump, require special precautions to know :
  • a) the pump must be placed above the low container, damage to the pump leading to a leak does not cause all the liquid to spill from the container,
  • b) the discharge line must not immerse in the liquid of the high container, a stop of the pump or a leak must not siphon the contents of the high container,
  • c) the pump must be removable without interrupting the pipe between the two containers,
  • d) when the pump is used, more especially on radioactive liquids, provision may be made to place the two receptacles, the pump and the pipes in a "cell".

Il est avantageux de placer la pompe au plafond de la cellule, avec l'arbre moteur vertical traversant la dalle de plafond, le moteur électrique de la pompe étant ainsi hors de la cellule,donc facilement accessible.It is advantageous to place the pump at the ceiling of the cell, with the vertical motor shaft passing through the ceiling slab, the electric motor of the pump being thus outside the cell, therefore easily accessible.

Une pompe permettant ces transferts de liquide et présentant ces divers avantages a été décrite dans le brevet français n⁰ 76 24748.A pump allowing these liquid transfers and having these various advantages has been described in French patent n ° 76 24748.

La pompe décrite dans ce brevet comprend extérieurement un bol sur lequel sont soudées les tuyauteries d'aspiration et de refoulement et une partie interne hydraulique qui est disposée (avec étanchéité) dans ledit bol et qui peut être démontée verti­calement sous protection.The pump described in this patent externally comprises a bowl on which are welded the suction and discharge pipes and an internal hydraulic part which is arranged (with sealing) in said bowl and which can be dismantled vertically under protection.

La présente invention est une pompe dont la configuration reprend celle décrite dans ledit brevet français mais qui propose une partie hydraulique interne différente en particulier mieux adaptée aux transferts des liquides avec des débits faibles (par exemple de l'ordre de 2 m³/h).The present invention is a pump whose configuration is that described in said French patent but which offers a different internal hydraulic part in particular better suited to the transfer of liquids with low flow rates (for example of the order of 2 m³ / h).

La présente invention concerne donc une pompe centrifuge auto­amorçante verticale, placée sous une dalle de béton, constituée d'un bol fixe soudé a des tuyauteries d'aspiration et de refoule­ment et fixe sous ladite dalle et d'une partie hydraulique interne disposée de façon étanche dans ledit bol et extractible par le haut,caractérisée en ce que ladite partie hydraulique est constituée d'une roue (13) à ailettes radiales entraînée par un arbre moteur traversant ladite dalle, ladite roue tournant entre une plaque inférieure (14) munie d'un trou d'aspiration et une cloison supé­rieure (20) formant le fond d'une chambre (12) et creusée, côté roue, d'une gorge ovale (23) faisant le tour de ladite cloison, ladite gorge étant fermée à l'une de ses extrémités et terminée par un trou (21) à l'autre de ses extrémités, ledit trou permettant l'évacuation du liquide.The present invention therefore relates to a vertical self-priming centrifugal pump, placed under a concrete slab, consisting of a fixed bowl welded to suction and discharge pipes and fixed under said slab and an internal hydraulic part arranged in a sealed manner. in said bowl and extractable from above, characterized in that said hydraulic part consists of a wheel (13) with radial fins driven by a drive shaft passing through said slab, said wheel rotating between a lower plate (14) provided with a suction hole and an upper partition (20) forming the bottom of a chamber (12) and hollowed out, on the wheel side, with an oval groove (23) going around said partition, said groove being closed to the one of its ends and terminated by a hole (21) at the other of its ends, said hole allowing the evacuation of the liquid.

L'invention sera mieux comprise et les autres caractéristiques de l'invention se dégageront plus facilement en se référant à l'exemple non limitatif ci-après qui illustre l'invention. La pompe selon l'invention est représentée sur les figures 1 à 7.The invention will be better understood and the other characteristics of the invention will emerge more easily by referring to the nonlimiting example below which illustrates the invention. The pump according to the invention is shown in Figures 1 to 7.

Lesdites figures représentent :

  • - figure 1 : une coupe verticale générale schématisant les positions de la pompe et de son moteur dans une dalle de béton ;
  • - figure 2 : une coupe verticale de la pompe ;
  • - figure 3 : une vue éclatée en perspective de la partie hydraulique ;
  • - figure 4 : une vue perspective de la fermeture inférieure de la partie hydraulique ;
  • - figure 5 : une coupe verticale de l'équipage démontable ;
  • - figure 6 : une coupe verticale agrandie de la partie hydraulique ;
  • - figure 7 : un modèle de joint.
Said figures represent:
  • - Figure 1: a general vertical section schematically showing the positions of the pump and its motor in a concrete slab;
  • - Figure 2: a vertical section of the pump;
  • - Figure 3: an exploded perspective view of the hydraulic part;
  • - Figure 4: a perspective view of the lower closure of the hydraulic part;
  • - Figure 5: a vertical section of the removable crew;
  • - Figure 6: an enlarged vertical section of the hydraulic part;
  • - Figure 7: a joint model.

Disposition générale (figure 1)General layout (Figure 1)

Une dalle de béton 3, horizontale, sépare une cellule haute 1 et une cellule basse 2. La cellule 2 contenant des produits dange­reux est inaccessible au personnel alors que la cellule 1 est destinée à rester propre et accessible.A concrete slab 3, horizontal, separates a high cell 1 and a low cell 2. Cell 2 containing dangerous products is inaccessible to personnel while cell 1 is intended to remain clean and accessible.

La pompe 4 est placée dans la cellule basse alors que le moteur d'entraînement 7 est situé dans la cellule 1.The pump 4 is placed in the lower cell while the drive motor 7 is located in the cell 1.

Le montage du moteur comprend une lanterne 8, l'arbre moteur 6 et une boîte à roulement 5. On place entre le moteur et l'arbre un accouplement.The assembly of the motor comprises a lantern 8, the motor shaft 6 and a bearing box 5. A coupling is placed between the motor and the shaft.

Constitution générale de la pompeGeneral constitution of the pump

La pompe est constituée d'un bol extérieur avec tubulure, d'un équipage démontable, d'un équipage hydraulique tournant, des roulements à billes, joints fixes, joints tournants.The pump consists of an external bowl with tubing, a removable equipment, a rotating hydraulic equipment, ball bearings, fixed seals, rotating seals.

La pompe est donc constituée d'un bol 15, de forme générale cylindrique, dont la partie haute, ouverte, forme une collerette fixée à la dalle de béton 3 et dont la partie basse est fermée.The pump therefore consists of a bowl 15, of generally cylindrical shape, the upper part of which, open, forms a collar fixed to the concrete slab 3 and the lower part of which is closed.

Le bol comporte trois tubulures soudées (et soudées aux tuyauteries) : une tubulure d'aspiration 18, une tubulure de refou­lement 24 et une tubulure d'aération (non figurée). La tubulure d'aspiration est soudée à la conduite amenant le fluide à pomper.The bowl has three welded pipes (and welded to the pipes): a suction pipe 18, a delivery pipe 24 and a ventilation pipe (not shown). The suction pipe is welded to the pipe bringing the fluid to be pumped.

La tubulure de refoulement est soudée à la tuyauterie amenant le liquide pompé.The discharge pipe is welded to the piping bringing the pumped liquid.

La tubulure d'aération est reliée à un système général de ventilation.The ventilation pipe is connected to a general ventilation system.

On doit considérer le bol comme fixe et constituant un tout avec les tuyauteries.The bowl should be considered as fixed and constituting a whole with the pipes.

Dans le bol prend place toute la partie hydraulique de la pompe ; cette partie est extractible et comporte un équipage tour­nant et un équipage mobile (l'adjectif mobile étant là pour rappeler que ledit équipage mobile est extractible mais,dans le fonction­nement de la pompe,ledit équipage mobile est bien entendu fixe).In the bowl takes place all the hydraulic part of the pump; this part is extractable and comprises a rotating assembly and a movable assembly (the mobile adjective being there to remind that said movable assembly is extractable but, in the operation of the pump, said movable assembly is of course fixed).

L'équipage tournant est représenté, monté dans le bol, sur la figure 2 et en vue éclatée pour la roue à ailettes sur la figure 3.The rotating assembly is shown, mounted in the bowl, in FIG. 2 and in exploded view for the impeller in FIG. 3.

Sur les figures 2 et 3, on peut voir l'équipage tournant qui comporte :
    - un arbre moteur 6 guidé en partie haute par les roulements à billes 25,
    - les garnitures d'étanchéité (ou joints tournants) 9,
    - en 13, à l'extrémité basse de l'arbre, une roue à ailettes dont les ailettes disposées radialement sont rectangulaires et régulièrement espacées. L'arc de circonférence entre deux ailettes consécutives est compris entre 10 et 30 degrés et de préférence voisin de 15 degrés. On notera que la roue à ailettes comporte une couronne centrale (34) pleine (figure 6) (non évidée en ailettes).In Figures 2 and 3, we can see the rotating crew which includes:
- a motor shaft 6 guided in the upper part by the ball bearings 25,
- the seals (or rotary joints) 9,
- At 13, at the lower end of the shaft, a fin wheel whose fins arranged radially are rectangular and regularly spaced. The arc of circumference between two consecutive fins is between 10 and 30 degrees and preferably around 15 degrees. It will be noted that the impeller has a central crown (34) full (Figure 6) (not hollowed out fins).

Sur les figures 2, 3, 4, 5 et 6 on peut voir également l'équipage mobile qui, à quelques détails près, se présente comme une pièce de révolution autour de l'axe de l'arbre moteur 6 (ver­tical).In FIGS. 2, 3, 4, 5 and 6 we can also see the mobile assembly which, with a few details, presents itself as a part of revolution around the axis of the motor shaft 6 (vertical).

La partie haute de l'équipage mobile comporte des parties planes qui,s'appuyant sur des parties planes correspondantes du bol,permettent d'assurer l'étanchéité grâce à deux joints 30 et 32 (figure 5).The upper part of the movable assembly comprises flat parts which, being supported on corresponding flat parts of the bowl, make it possible to ensure sealing by means of two seals 30 and 32 (FIG. 5).

La partie basse de l'équipage mobile forme une boîte cylin­drique limitée latéralement par une paroi 11, vers le bas par la plaque de base amovible 14 (maintenue en place par des vis 33 - ­figure 6) percée d'un orifice muni de l'ajutage 16 et vers le haut par une plaque 10 perforée de trous 29. La partie centrale de cet équipage mobile entoure l'arbre moteur 6 en laissant évidem­ment la place nécessaire pour la ou les garnitures d'étanchéité 9. A l'intérieur de la boîte cylindrique se trouve une cloison horizon­tale 20 qui sépare l'intérieur de la boîte en deux parties, une partie basse qui contiendra la roue à ailettes 13 et une partie haute (12 figure 7) formant chambre de refoulement.The lower part of the moving assembly forms a cylindrical box bounded laterally by a wall 11, downwards by the removable base plate 14 (held in place by screws 33 - Figure 6) pierced with an orifice provided with the nozzle 16 and upwards by a plate 10 perforated with holes 29. The central part of this movable assembly surrounds the motor shaft 6, obviously leaving the necessary space for the seal (s) 9. Inside the cylindrical box is a horizontal partition 20 which separates the interior of the box into two parts, a lower part which will contain the impeller 13 and a high part (12 figure 7) forming a delivery chamber.

Ladite cloison 20 délimite donc la chambre basse dans laquelle la roue à ailettes 13 est disposée ; cette cloison et le rôle qu'elle joue dans l'invention sont décrits ci-après en se référant plus particulièrement aux figures 4 et 6.Said partition 20 therefore delimits the lower chamber in which the impeller 13 is arranged; this partition and the role it plays in the invention are described below with particular reference to FIGS. 4 and 6.

Cette cloison a la forme d'un disque circulaire épais creusé d'une gorge 23 sur la face inférieure. (Il est rappelé que la figure 4 montre la cloison retournée pour permettre de voir la gorge).This partition has the shape of a thick circular disc hollowed out of a groove 23 on the underside. (It is recalled that Figure 4 shows the partition turned over to allow the groove to be seen).

La gorge se termine par un trou 21 traversant la cloison 20. Un deuxième trou 22 situé sur un même rayon que le premier trou 21, mais plus près du centre, traverse également la cloison 20.The groove ends with a hole 21 passing through the partition 20. A second hole 22 situated on the same radius as the first hole 21, but closer to the center, also passes through the partition 20.

A la partie supérieure (voir en particulier les figures 2 et 3),une petite plaque 17 sépare les deux trous 21 et 22.At the upper part (see in particular Figures 2 and 3), a small plate 17 separates the two holes 21 and 22.

La gorge 23 est entourée d'une partie plane 35.The groove 23 is surrounded by a flat part 35.

La figure 6 montre que la gorge 23 a la forme d'un demi-­ovale et par exemple d'une "anse de panier".Figure 6 shows that the groove 23 has the shape of a half-oval and for example of a "basket handle".

On voit de même sur la figure 6 que la paroi latérale 11 doit, à l'intérieur, présenter en partie basse, un profil concave 31 prolongeant la section de la gorge 23.It can also be seen in FIG. 6 that the side wall 11 must, on the inside, have in the lower part, a concave profile 31 extending the section of the groove 23.

Les dimensions relatives (en diamètre) de la gorge 23 et de la roue à ailettes 13 sont bien indiquées par la figure 6 : l'ai­lette doit occuper entre les 3/4 et les 2/3 de la gorge.The relative dimensions (in diameter) of the groove 23 and the impeller 13 are well indicated in Figure 6: the fin must occupy between 3/4 and 2/3 of the groove.

En appelant Ra le rayon maximal de la roue à ailettes, Re le rayon extérieur de la gorge, Ri son rayon intérieur, on doit avoir de préférence :
    Re -¼ (Re-Ri) > Ra > Re - ⅓ (Re -Ri).By calling Ra the maximum radius of the impeller, Re the outside radius of the groove, Ri its inside radius, we should preferably have:
R e -¼ (R e -Ri)> R a > R e - ⅓ (R e -Ri).

Par contre, le rayon Rm du moyeu 34 de la roue à ailettes 13 doit être notablement plus petit que le rayon intérieur Ri de la gorge.By cons, the radius Rm of the hub 34 of the impeller 13 must be significantly smaller than the inner radius Ri of the groove.

La figure 6 montre qu'il existe un jeu entre la roue à ailettes 13 et la cloison 20 d'une part et la plaque de base 14 d'autre part. Ce jeu doit permettre la libre rotation de la roue, mais être assez faible pour que les forces capillaires assurent une étanchéité des deux côtés de la roue à ailettes.Figure 6 shows that there is a clearance between the impeller 13 and the partition 20 on the one hand and the base plate 14 on the other hand. This play must allow the free rotation of the wheel, but be weak enough for the capillary forces to ensure a seal on both sides of the impeller.

On peut proposer un jeu de 0,1 mm comme valeur préférée.A play of 0.1 mm can be proposed as a preferred value.

Le fonctionnement correct de la pompe selon l'invention implique, comme l'imagine le spécialiste, qu'il y ait indépen­dance, c'est-à-dire de préférence étanchéité, entre la chambre d'aspiration 19 (figures 2 et 7) comprise entre le bol et l'équi­page mobile et la chambre de refoulement 12 (figure 7).The correct functioning of the pump according to the invention implies, as the specialist imagines, that there is independence, that is to say preferably a seal, between the suction chamber 19 (FIGS. 2 and 7) between the bowl and the moving element and the delivery chamber 12 (FIG. 7).

On peut placer un joint entre la paroi 11 et le bossage 39 du bol ou, d'une manière préférée,placer des segments métalliques 38 dans des gorges 36, 37 de la paroi 11. Les segments sont de préférence au nombre de 2.A joint can be placed between the wall 11 and the boss 39 of the bowl or, in a preferred manner, metal segments 38 can be placed in grooves 36, 37 of the wall 11. The segments are preferably 2 in number.

On notera qu'il est impératif de laisser un jeu entre le diamètre de fond de gorge et le diamètre intérieur du segment pour permettre le montage de la pompe.Note that it is imperative to leave a clearance between the throat bottom diameter and the inner diameter of the segment to allow mounting of the pump.

On peut tolérer une legère fuite au niveau des segments métalliques ; son seul inconvénient est de diminuer (très peu) le débit de la pompe.We can tolerate a slight leak at the metal segments; its only drawback is to decrease (very little) the flow rate of the pump.

On décrira maintenant de façon sommaire le mode de fonction­nement de la pompe selon l'invention qui, on le rappelle, est une pompe centrifuge autoamorçante.We will now describe briefly the operating mode of the pump according to the invention which, as we recall, is a self-priming centrifugal pump.

On prend comme point de départ une pompe arrêtée, contenant assez de liquide pour l'immersion de la roue ; il y a de l'air dans la canalisation d'aspiration et en partie haute du bol.We take as a starting point a stopped pump, containing enough liquid for the immersion of the wheel; there is air in the suction pipe and in the upper part of the bowl.

A la mise en rotation, le liquide présent dans la gorge 23 est poussé, par le trou 21,dans la chambre 12.On rotation, the liquid present in the groove 23 is pushed through the hole 21 into the chamber 12.

Ce volume de liquide est remplacé par un même volume d'air provenant de la tubulure 16.This volume of liquid is replaced by the same volume of air coming from the tube 16.

La rotation de la roue mélange eau et air et par le trou 21 il sort une "émulsion" instable. Dans la zone 12 il y a séparation de l'air qui part par les trous 29 et de l'eau qui retombe par le trou 22 vers la roue.The rotation of the wheel mixes water and air and through hole 21 there comes out an unstable "emulsion". In zone 12 there is separation of the air which leaves through the holes 29 and the water which falls through the hole 22 towards the wheel.

La plaque 17 séparant les deux troux évite à l'émulsion de retomber par le trou 22 avant la séparation eau-air.The plate 17 separating the two holes prevents the emulsion from falling through the hole 22 before the water-air separation.

Le même cycle se renouvelle jusqu'à ce que tout l'air de la canalisation d'aspiration ait été évacué vers le refoulement. Le liquide à aspirer emplit alors la pompe qui prend son régime hydraulique normal comme pompe à canal périphérique. On aspire dans le fond du bol par la tubulure 16, on refoule par le trou 21 dans la chambre 12 puis par les trous 29 dans la chambre de refou­lement 12′ et la tubulure de refoulement 24.The same cycle is repeated until all the air from the suction line has been evacuated to the discharge. The liquid to be sucked then fills the pump which takes its normal hydraulic speed as a peripheral channel pump. The suction is sucked into the bottom of the bowl through the tube 16, it is discharged through the hole 21 in the chamber 12 and then through the holes 29 in the discharge chamber 12 ′ and the discharge nozzle 24.

On met donc en fonctionnement une pompe située au-dessus du réservoir de liquide à déplacer, sans aucun clapet, ce qui élimine le risque de fuite.We therefore put into operation a pump located above the liquid reservoir to be moved, without any valve, which eliminates the risk of leakage.

Pour le démontage de la pompe on notera que, en enlevant le moteur, puis l'accouplement, on peut extraire tout l'intérieur de la pompe : équipement mobile et partie tournante à travers le trou de la dalle de séparation. La pompe étant placée au-dessus du réservoir et les canalisations étant soudées au bol qui reste en place, il n'y à aucun liquide répandu.For the dismantling of the pump, it should be noted that, by removing the motor, then the coupling, the entire interior of the pump can be extracted: mobile equipment and rotating part through the hole in the separation slab. The pump being placed above the tank and the pipes being welded to the bowl which remains in place, there is no liquid spilled.

Il est nécessaire de protéger le personnel contre le liquide restant sur la partie extraite de la pompe quand ce dernier est radioactif.It is necessary to protect personnel against the liquid remaining on the extracted part of the pump when the latter is radioactive.

On mentionnera enfin les dimensions et caractéristiques d'une des pompes réalisable selon l'invention :
    - roue à ailettes de diamètre 90 mm ; d'épaisseur 10 mm et comportant 24 ailettes ;
    - vitesse de rotation de l'arbre moteur 2 900 tr/min ; avec ladite pompe et en pompant de l'eau froide dont le niveau est situé à 6,5 m au-dessous de la pompe, on assure un débit de 1 500 l/h si le niveau de refoulement de l'eau est à 46 m et de 2 000 l/h si le niveau de refoulement est à 25 m.Finally, the dimensions and characteristics of one of the pumps that can be produced according to the invention will be mentioned:
- 90 mm diameter impeller; 10 mm thick and comprising 24 fins;
- speed of rotation of the motor shaft 2 900 rpm; with said pump and by pumping cold water the level of which is located 6.5 m below the pump, a flow rate of 1,500 l / h is ensured if the water delivery level is at 46 m and 2,000 l / h if the delivery level is 25 m.

Cette même roue, utilisée dans une pompe centrifuge connue, donnerait une hauteur manométrique totale environ 4 fois plus faible.This same wheel, used in a known centrifugal pump, would give a total head height approximately 4 times lower.

Claims (5)

1. Pompe centrifuge autoamorçante verticale, placée sous une dalle de protection,constituée d'un bol fixe soudé aux tuyaute­ries d'aspiration et de refoulement et d'un équipement mobile extractible par le haut, caractérisée en ce que la partie hydrau­lique est constituée d'une roue (13) à ailettes radiales entraînée par un arbre moteur, que ladite roue tourne entre une plaque infé­rieure (14) munie d'un trou d'aspiration et une cloison supérieure (20) creusée, côté roue, d'une gorge ovale (23) terminée par un trou (21) permettant la sortie du liquide.1. Vertical self-priming centrifugal pump, placed under a protective slab, consisting of a fixed bowl welded to the suction and discharge pipes and of mobile equipment extractable from above, characterized in that the hydraulic part consists of '' a wheel (13) with radial fins driven by a drive shaft, that said wheel rotates between a lower plate (14) provided with a suction hole and an upper partition (20) hollowed out, on the wheel side, with a groove oval (23) terminated by a hole (21) allowing the liquid to exit. 2. Pompe selon la revendication 1, caractérisée en ce que la cloison de fermeture supérieure (20) comporte un deuxième trou (22) situé pratiquement sur le même rayon que le trou (21) mais plus près de l'axe et que sur la face de la cloison (20) opposée à la roue (13) une plaque (17) sépare les trous (21) et (22).2. Pump according to claim 1, characterized in that the upper closing partition (20) has a second hole (22) located practically on the same radius as the hole (21) but closer to the axis and than on the face of the partition (20) opposite the wheel (13) a plate (17) separates the holes (21) and (22). 3. Pompe selon les revendications 1 et 2, caractérisée en ce que la gorge (23) a une section en anse de panier et que la partie basse (31) de la paroi latérale (11) de l'équipement mobile a une section prolongeant sans discontinuité la section de la gorge (23).3. Pump according to claims 1 and 2, characterized in that the groove (23) has a basket handle section and that the lower part (31) of the side wall (11) of the mobile equipment has a section extending without discontinuity the section of the groove (23). 4. Pompe selon les revendications 1 à 3, caractérisée en ce que l'étanchéité entre le bol fixe et l'équipement mobile (11) est assurée par un ou plusieurs segments métalliques placés chacun dans une gorge (37) creusée dans la paroi latérale (11).4. Pump according to claims 1 to 3, characterized in that the seal between the fixed bowl and the mobile equipment (11) is ensured by one or more metal segments each placed in a groove (37) hollowed out in the side wall (11). 5. Pompe selon l'une quelconque des revendications précé­dentes, caractérisée en ce que le rayon extérieur Ra de la roue à ailettes (13), le rayon extérieur Re de la gorge (23) et le rayon intérieur Ri de ladite gorge sont liés par l'inégalité
      Re - ¼ (Re-Ri) > Ra > Re - ⅓ (Re -Ri).5. Pump according to any one of the preceding claims, characterized in that the external radius Ra of the impeller (13), the external radius Re of the groove (23) and the internal radius Ri of said groove are linked by inequality
R e - ¼ (R e -Ri)> R a > R e - ⅓ (R e -Ri).
EP88401531A 1987-06-22 1988-06-20 Selfpriming centrifugal pump for dangerous liquids particularly radio-active liquids Expired - Lifetime EP0296952B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8708726A FR2616853B1 (en) 1987-06-22 1987-06-22 SELF-PRIMING CENTRIFUGAL PUMP FOR DANGEROUS LIQUIDS ESPECIALLY RADIOACTIVE
FR8708726 1987-06-22

Publications (2)

Publication Number Publication Date
EP0296952A1 true EP0296952A1 (en) 1988-12-28
EP0296952B1 EP0296952B1 (en) 1992-03-04

Family

ID=9352340

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88401531A Expired - Lifetime EP0296952B1 (en) 1987-06-22 1988-06-20 Selfpriming centrifugal pump for dangerous liquids particularly radio-active liquids

Country Status (9)

Country Link
EP (1) EP0296952B1 (en)
JP (1) JP2637477B2 (en)
KR (1) KR960016790B1 (en)
CN (1) CN1015126B (en)
BR (1) BR8803160A (en)
CA (1) CA1325552C (en)
DE (1) DE3868719D1 (en)
ES (1) ES2030184T3 (en)
FR (1) FR2616853B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211033A1 (en) * 1992-04-02 1993-10-07 Klein Schanzlin & Becker Ag Pump unit

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE761490C (en) * 1941-06-28 1954-01-25 Siemens Schuckertwerke A G Submersible pump
FR1334508A (en) * 1962-06-29 1963-08-09 Wauquier Soc Nouv Ets Method of constructing centrifugal pumps with vertical axis and pumps produced by this method
FR1356951A (en) * 1962-12-19 1964-04-03 Materiel Telephonique Vertical pump
FR1593585A (en) * 1968-10-09 1970-06-01
DE2165412A1 (en) * 1970-12-31 1972-07-06 Pomorska Odlewnia Emaliernia Self-priming circulation pump
FR2389788A1 (en) * 1977-05-07 1978-12-01 Hermetic Pumpen Gmbh Electrically driven pump for remote location - has tapered casing for alignment into tapered seat of pipeline
EP0133497A2 (en) * 1983-08-03 1985-02-27 Robert Bosch Gmbh Regenerative pump for transferring a fuel

Family Cites Families (10)

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FR1334408A (en) * 1962-06-25 1963-08-09 Moteurs Leroy Alternator pole wheel
JPS4213729Y1 (en) * 1964-03-16 1967-08-04
JPS5730466Y2 (en) * 1976-07-30 1982-07-03
FR2361558A1 (en) * 1976-08-13 1978-03-10 Saint Gobain Techn Nouvelles SELF-PRIMING CENTRIFUGAL PUMPS IMPROVEMENTS
JPS5824637B2 (en) * 1976-09-30 1983-05-23 株式会社ワ−ルドケミカル self-priming pump
JPS5664193A (en) * 1979-12-06 1981-06-01 Anretsuto:Kk Self-suction box of clean water self-suction system line pump
JPS5896289A (en) * 1981-12-04 1983-06-08 株式会社日立製作所 Gasket of internal pump
JPS616700U (en) * 1984-06-20 1986-01-16 共同エンジニアリング株式会社 self-priming pump
JPS6134388A (en) * 1985-02-25 1986-02-18 Hitachi Ltd Method of manufacturing synthetic resin pump
JPS6375665U (en) * 1986-11-07 1988-05-20

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE761490C (en) * 1941-06-28 1954-01-25 Siemens Schuckertwerke A G Submersible pump
FR1334508A (en) * 1962-06-29 1963-08-09 Wauquier Soc Nouv Ets Method of constructing centrifugal pumps with vertical axis and pumps produced by this method
FR1356951A (en) * 1962-12-19 1964-04-03 Materiel Telephonique Vertical pump
FR1593585A (en) * 1968-10-09 1970-06-01
DE2165412A1 (en) * 1970-12-31 1972-07-06 Pomorska Odlewnia Emaliernia Self-priming circulation pump
FR2389788A1 (en) * 1977-05-07 1978-12-01 Hermetic Pumpen Gmbh Electrically driven pump for remote location - has tapered casing for alignment into tapered seat of pipeline
EP0133497A2 (en) * 1983-08-03 1985-02-27 Robert Bosch Gmbh Regenerative pump for transferring a fuel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4211033A1 (en) * 1992-04-02 1993-10-07 Klein Schanzlin & Becker Ag Pump unit
DE4211033C2 (en) * 1992-04-02 2000-08-03 Ksb Ag Centrifugal pump unit

Also Published As

Publication number Publication date
JP2637477B2 (en) 1997-08-06
BR8803160A (en) 1989-02-08
CN1015126B (en) 1991-12-18
EP0296952B1 (en) 1992-03-04
KR890000795A (en) 1989-03-16
CA1325552C (en) 1993-12-28
KR960016790B1 (en) 1996-12-21
JPH01117994A (en) 1989-05-10
CN1030815A (en) 1989-02-01
FR2616853A1 (en) 1988-12-23
ES2030184T3 (en) 1992-10-16
DE3868719D1 (en) 1992-04-09
FR2616853B1 (en) 1989-11-17

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