EP0844399A1 - Thermal barrier for primary pump - Google Patents

Thermal barrier for primary pump Download PDF

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Publication number
EP0844399A1
EP0844399A1 EP97402717A EP97402717A EP0844399A1 EP 0844399 A1 EP0844399 A1 EP 0844399A1 EP 97402717 A EP97402717 A EP 97402717A EP 97402717 A EP97402717 A EP 97402717A EP 0844399 A1 EP0844399 A1 EP 0844399A1
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EP
European Patent Office
Prior art keywords
thermal barrier
flange
heat shield
barrier according
envelope
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Withdrawn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
EP97402717A
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German (de)
French (fr)
Inventor
Louis Mazuy
Jean Guy Bertrand
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Jeumont Industrie
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Jeumont Industrie
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Filing date
Publication date
Application filed by Jeumont Industrie filed Critical Jeumont Industrie
Publication of EP0844399A1 publication Critical patent/EP0844399A1/en
Withdrawn legal-status Critical Current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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5893—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps heat insulation or conduction
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5866—Cooling at last part of the working fluid in a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/06—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being hot or corrosive, e.g. liquid metals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive

Definitions

  • the invention relates to a thermal barrier of nuclear reactor primary pump.
  • thermal barrier is arranged just above the primary pump impeller and its purpose is to prevent the heat flow of the fluid primary go back to the upper parts of the pump. It thus makes it possible in particular to protect the joints sealing.
  • Figure 1 illustrates the state of the art and represents a partial section of a primary pump, along the axis of the pump, this pump comprising a thermal barrier classic.
  • the primary pump has a shaft 1, with an axis substantially vertical 9, which is set in motion by a motor not shown in the figure and arranged above the pump body, via a support 3.
  • the thermal barrier 7 consists of a flange 10, and of an envelope 12, of revolution around the axis 9 of the machine.
  • the envelope 12 has a lower part or bottom 18 and a peripheral wall 19.
  • the wall peripheral 19 is cylindrical of revolution around the axis 9.
  • the flange 10 and the bottom 18 are substantially planar and parallel to each other.
  • the flange 10 and the casing 12 are welded together by the link 15 and define a cavity 20 in which is placed a coil 11 forming a heat exchanger heat. It consists of 28 tubes which pass through holes in the flange which are welded to this one.
  • the connection 15 is a corner weld.
  • a heat shield 13 is provided inside the envelope 12, on the peripheral wall 19 of the envelope 12.
  • the tubes 28 of the coil are connected to a conduit 14 connected to a coolant circuit.
  • the subject of the invention is a thermal barrier of primary pump comprising a flange, a casing, as well that a heat exchanger and a heat shield placed at the interior of the cavity delimited by the flange and the envelope, characterized in that the heat shield covers substantially the entire internal surface of the envelope.
  • This screen modification protects the entire envelope and removes the root cause cracks between the periphery and the bottom of the envelope.
  • This new weld avoids introducing primers cracking at the connection between the flange and the envelope.
  • the thermal barrier according to the invention can be originally mounted on a primary pump when manufacture of the latter. It can also be made from a conventional thermal barrier, by example during a maintenance operation, when cracks were detected during an inspection.
  • the barrier thermal is substantially centered on the axis 9 of the pump primary and includes the flange 10, the heat exchanger 11 and the envelope 12 already described with reference to FIG. 1.
  • the heat shield 35 is modified. His part peripheral 16, substantially centered on axis 9 and already provided in conventional thermal barriers (see the reference 13 in FIG. 1), is extended by a part lower 17 which protects the bottom 18 of the casing 12.
  • the lower part 17 of the heat shield can in particular be constituted by a disc plate, pinched between the bottom 18 of the casing and the heat exchanger 11.
  • an interface 21 connects the part device 16 of the screen at its lower part 17.
  • This interface is designed to take into account expansions differentials between parts.
  • the lower part 17 of the heat shield is advantageously placed on the bottom 18 of the envelope and placed edge to edge with interface 21, seamless.
  • the lower part 17 and the interface 21 include, for example, complementary heels 46 and 47 providing an annular clearance between them.
  • the heat shield 35 substantially covers and protects the entire internal surface 36 of the envelope.
  • a preferred embodiment of the game thermal screen device 16 has been described in reference to figure 3.
  • the peripheral part includes an outer sheet 48 and an inner sheet 49. These two sheets are substantially cylindrical and centered on the shaft 9.
  • the outer sheet 48 is connected to the interface 21, by through a weld 50, to avoid any passage of water between the casing 12 and the heat shield 16.
  • a spot welding is provided between the inner sheet 49 and interface 21.
  • These sheets 51 have bosses 52 regularly distributed over their surface. The sheets are placed one compared to the others, so that the bosses 52 are staggered. These bosses maintain a space between the sheets 51.
  • the bottom of the groove 22 advantageously has a curved shape to avoid breaking points in the flange.
  • an upper part 25 which takes the form of a ring, substantially centered on the shaft 9.
  • This ring has a clearance 26. It is located opposite the link 27, made between the flange 10 and the peripheral wall 19 of the envelope.
  • the opposite ends of the flange 10 and of the peripheral wall 19 of the envelope 12 has a heel 40, respectively 41.
  • the heels are intended to be placed edge to edge, a recess 42 being formed between the flange 10 and the wall peripheral 19.
  • the clearance 26 produced in the ring 25 provides a full weld penetration without risk of reaching the ring 25.
  • the ring 25 can move freely in a direction substantially parallel to the shaft 9, thanks to the clearance 26. The latter eliminates any risk of jamming of the ring 25 against the bead 45 created during the welding operation.
  • This welding does not introduce primers of cracking between the flange and the casing.
  • the ring 25 is advantageously made of a material thermally protective.
  • the screen thus has a part upper which extends the protection in the flange, beyond of the link 27.
  • the ring 25 has, on its inner surface 43, studs 44. They are regularly distributed over the surface 43.
  • the studs also allow the circulation of this gas.
  • thermal barrier shown in Figure 6 has been designed from the outset in accordance with the invention.
  • a flange 34 different from that used for a known thermal barrier a flange 34 different from that used for a known thermal barrier.
  • the holes 30 made in the flange for the passage of the tubes 28 of the coil can be positioned on a diameter lower than that conventionally chosen for holes 29 of a thermal barrier conforming to the state of the technical.
  • a groove 31 is produced during the flange manufacturing.
  • the heat shield is consisting of a peripheral part 16 and a part lower 17, protecting the peripheral part 19 and the bottom 18 of the envelope.
  • an interface 21 is provided between the peripheral part 19 and bottom 18 to compensate for differential expansions between parts.
  • the heat shield could also include a part upper 32, placed in the groove 31, above the joint welded 33 between the casing 12 and the flange 10.
  • the upper part 32 makes it possible to further improve the thermal protection of the enclosure and the flange.
  • the link 33 is, like the welded joint 27 illustrated in Figures 2 and 3, of the butt joint type by welding full penetration. Conventional methods can be implemented for this purpose.
  • This type of joint avoids introducing primers of cracking in the flange.
  • the weld between the flange 10 and the peripheral wall 19 of the envelope is made of TIG automatic, under an Argon atmosphere. Any other type of suitable soldering can be considered.
  • the thermal barrier according to the invention obtained by modification of a conventional barrier already in service or designed from the outset to present the characteristics of the invention thus eliminates the risks of existing cracking on thermal barriers classics. It contributes to increasing the safety of nuclear reactors.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The thermal barrier consists of a coupling member (34), a shell (12), a heat exchanger (11) and a thermal screen (35) which covers virtually the whole inner surface of the shell. Between the shell and the coupling an end-to-end joint (33) is formed, for example, by full penetration welding. The thermal screen has a peripheral section in the form of a ring round the axis of the pump and a base (17) which lies perpendicular to it. The ring is formed from sheet metal and the base is a disc, with the two linked by an interface (21).

Description

L'invention est relative à une barrière thermique de pompe primaire de réacteur nucléaire.The invention relates to a thermal barrier of nuclear reactor primary pump.

De façon connue, une telle barrière thermique est disposée juste au-dessus de la roue de la pompe primaire et elle a pour objet d'empêcher le flux de chaleur du fluide primaire de remonter vers les parties supérieures de la pompe. Elle permet ainsi notamment de protéger les joints d'étanchéité.In known manner, such a thermal barrier is arranged just above the primary pump impeller and its purpose is to prevent the heat flow of the fluid primary go back to the upper parts of the pump. It thus makes it possible in particular to protect the joints sealing.

La figure 1 illustre l'état de l'art et représente une coupe partielle d'une pompe primaire, selon l'axe de la pompe, cette pompe comportant une barrière thermique classique.Figure 1 illustrates the state of the art and represents a partial section of a primary pump, along the axis of the pump, this pump comprising a thermal barrier classic.

La pompe primaire comporte un arbre 1, à axe sensiblement vertical 9, qui est mis en mouvement par un moteur non représenté sur la figure et disposé au-dessus du corps de pompe, par l'intermédiaire d'un support 3.The primary pump has a shaft 1, with an axis substantially vertical 9, which is set in motion by a motor not shown in the figure and arranged above the pump body, via a support 3.

Le corps de pompe 2 comprend essentiellement les éléments suivants :

  • une partie hydraulique comportant une volute 4, une roue 5 et un ensemble diffuseur-guide d'eau 6,
  • une tubulure d'aspiration et une tubulure de refoulement qui ne sont pas représentées sur les figures,
  • une barrière thermique 7, un palier 8 et un dispositif de joint d'arbre qui n'est pas illustré sur la figure.
The pump body 2 essentially comprises the following elements:
  • a hydraulic part comprising a volute 4, a wheel 5 and a diffuser-water guide assembly 6,
  • a suction pipe and a delivery pipe which are not shown in the figures,
  • a thermal barrier 7, a bearing 8 and a shaft seal device which is not illustrated in the figure.

La barrière thermique 7 est constituée d'une bride 10, et d'une enveloppe 12, de révolution autour de l'axe 9 de la machine. L'enveloppe 12 comporte une partie inférieure ou fond 18 et une paroi périphérique 19. La paroi périphérique 19 est cylindrique de révolution autour de l'axe 9. La bride 10 et le fond 18 sont sensiblement plans et parallèles entre eux.The thermal barrier 7 consists of a flange 10, and of an envelope 12, of revolution around the axis 9 of the machine. The envelope 12 has a lower part or bottom 18 and a peripheral wall 19. The wall peripheral 19 is cylindrical of revolution around the axis 9. The flange 10 and the bottom 18 are substantially planar and parallel to each other.

La bride 10 et l'enveloppe 12 sont soudées entre elles par la liaison 15 et définissent une cavité 20 dans laquelle est placé un serpentin 11 formant un échangeur de chaleur. Il est constitué de tubes 28 qui passent à travers des orifices pratiqués dans la bride et qui sont soudés sur celle-ci. La liaison 15 est une soudure en coin.The flange 10 and the casing 12 are welded together by the link 15 and define a cavity 20 in which is placed a coil 11 forming a heat exchanger heat. It consists of 28 tubes which pass through holes in the flange which are welded to this one. The connection 15 is a corner weld.

Un écran thermique 13 est prévu à l'intérieur de l'enveloppe 12, sur la paroi périphérique 19 de l'enveloppe 12.A heat shield 13 is provided inside the envelope 12, on the peripheral wall 19 of the envelope 12.

Les tubes 28 du serpentin sont raccordés à un conduit 14 relié à un circuit de fluide de refroidissement.The tubes 28 of the coil are connected to a conduit 14 connected to a coolant circuit.

Des fluctuations thermiques importantes apparaissent au niveau de la barrière thermique. L'enveloppe 12, la liaison soudée 15 et les secteurs de bride situés entre les deux faisceaux de tubes sont très sollicités par les changements thermiques.Significant thermal fluctuations appear at the level of the thermal barrier. Envelope 12, the connection welded 15 and the flange sectors located between the two tube bundles are highly stressed by changes thermal.

Ces sollicitations risquent, dans certains cas, de générer des fissures.These requests risk, in some cases, generate cracks.

Or ces éventuelles fissures peuvent, à terme, avoir des conséquences dommageables sur le fonctionnement de la pompe primaire.However, these possible cracks may ultimately have damaging consequences on the functioning of the pump primary.

Dans un souci d'accroítre la sécurité des centrales nucléaires, il est donc apparu nécessaire d'améliorer les barrières thermiques connues pour éviter tout risque de fissuration.In order to increase the safety of power plants nuclear power, it therefore appeared necessary to improve the thermal barriers known to avoid any risk of cracking.

L'invention a pour objet une barrière thermique de pompe primaire comprenant une bride, une enveloppe, ainsi qu'un échangeur de chaleur et un écran thermique placés à l'intérieur de la cavité délimitée par la bride et l'enveloppe, caractérisée en ce que l'écran thermique recouvre sensiblement toute la surface interne de l'enveloppe.The subject of the invention is a thermal barrier of primary pump comprising a flange, a casing, as well that a heat exchanger and a heat shield placed at the interior of the cavity delimited by the flange and the envelope, characterized in that the heat shield covers substantially the entire internal surface of the envelope.

Cette modification de l'écran permet de protéger l'ensemble de l'enveloppe et supprime la cause essentielle des fissurations entre la périphérie et le fond de l'enveloppe. This screen modification protects the entire envelope and removes the root cause cracks between the periphery and the bottom of the envelope.

Par ailleurs, la soudure classiquement utilisée pour fixer l'enveloppe sur la bride est relativement difficile à réaliser et elle a tendance à générer une fissuration dans la bride.Furthermore, the weld conventionally used for fixing the casing to the flange is relatively difficult to realize and it tends to generate cracking in the flange.

C'est pourquoi, de façon préférée, la barrière thermique selon l'invention comporte, entre la bride et l'enveloppe, une liaison du type joint bout à bout, par soudage à pleine pénétration.This is why, preferably, the barrier between the flange and the envelope, a joint type joint end to end, by full penetration welding.

Cette nouvelle soudure évite d'introduire des amorces de fissuration au niveau de la liaison entre la bride et l'enveloppe.This new weld avoids introducing primers cracking at the connection between the flange and the envelope.

D'autres caractéristiques de l'invention peuvent également être prises en considération, seules ou selon toute combinaison techniquement possible :

  • l'écran thermique comporte une partie périphérique de révolution autour de l'axe de la pompe et une partie inférieure sensiblement perpendiculaire audit axe,
  • la partie périphérique de l'écran thermique est constituée par des tôles sensiblement cylindriques et centrées sur l'axe de la pompe,
  • une partie desdites tôles comportent des bossages, les tôles étant de préférence disposées de telle sorte que les bossages sont disposés en quinconce,
  • une interface est placée entre les parties périphérique et inférieure,
  • la partie inférieure de l'écran est une plaque-disque posée sur le fond de l'enveloppe,
  • la partie inférieure de l'écran thermique et l'interface comportent des talons complémentaires ménageant entre eux un jeu annulaire,
  • une gorge est pratiquée dans la bride pour permettre la réalisation du joint,
  • l'écran thermique comporte une partie supérieure qui le prolonge dans la bride, au-delà dudit joint entre la bride et l'enveloppe.
Other characteristics of the invention can also be taken into consideration, alone or in any technically possible combination:
  • the thermal screen comprises a peripheral part of revolution around the axis of the pump and a lower part substantially perpendicular to said axis,
  • the peripheral part of the heat shield consists of substantially cylindrical sheets and centered on the axis of the pump,
  • part of said sheets have bosses, the sheets being preferably arranged in such a way that the bosses are staggered,
  • an interface is placed between the peripheral and lower parts,
  • the lower part of the screen is a disk plate placed on the bottom of the envelope,
  • the lower part of the heat shield and the interface have complementary heels providing an annular clearance between them,
  • a groove is made in the flange to allow the joint to be produced,
  • the heat shield has an upper part which extends it into the flange, beyond said joint between the flange and the casing.

D'autres buts, avantages et caractéristiques de l'invention apparaítront plus clairement à la lecture de la description qui suit de modes de réalisation non limitatifs de l'invention et qui est faite en relation avec les dessins annexés sur lesquels :

  • la figure 2 représente une demi-coupe selon l'axe de la pompe primaire, d'une barrière thermique selon l'invention réalisée à partir d'une barrière thermique classique,
  • la figure 3 représente, en vue agrandie, le détail A de la figure 2,
  • la figure 4 représente, en vue agrandie, le détail B de la figure 2, avant la réalisation de la soudure,
  • la figure 5 représente, en vue agrandie, le même détail B, après réalisation de la soudure et
  • la figure 6 représente une demi-coupe selon l'axe de la pompe primaire, d'une barrière thermique réalisée, à l'origine, selon l'invention.
Other objects, advantages and characteristics of the invention will appear more clearly on reading the description which follows of nonlimiting embodiments of the invention and which is given in relation to the appended drawings in which:
  • FIG. 2 represents a half-section along the axis of the primary pump, of a thermal barrier according to the invention produced from a conventional thermal barrier,
  • FIG. 3 represents, in an enlarged view, the detail A of FIG. 2,
  • FIG. 4 represents, in an enlarged view, the detail B of FIG. 2, before the welding is carried out,
  • FIG. 5 represents, in an enlarged view, the same detail B, after completion of the welding and
  • FIG. 6 represents a half-section along the axis of the primary pump, of a thermal barrier produced, originally, according to the invention.

Les éléments communs aux différentes figures seront désignés par les mêmes références.The elements common to the different figures will be designated by the same references.

La barrière thermique selon l'invention peut être montée à l'origine sur une pompe primaire lors de la fabrication de cette dernière. Elle peut également être réalisée à partir d'une barrière thermique classique, par exemple lors d'une opération de maintenance, lorsque des fissures ont été détectées au cours d'un contrôle.The thermal barrier according to the invention can be originally mounted on a primary pump when manufacture of the latter. It can also be made from a conventional thermal barrier, by example during a maintenance operation, when cracks were detected during an inspection.

En référence tout d'abord à la figure 2, la barrière thermique est sensiblement centrée sur l'axe 9 de la pompe primaire et comporte la bride 10, l'échangeur de chaleur 11 et l'enveloppe 12 déjà décrits en référence à la figure 1. Referring first to Figure 2, the barrier thermal is substantially centered on the axis 9 of the pump primary and includes the flange 10, the heat exchanger 11 and the envelope 12 already described with reference to FIG. 1.

En premier lieu, si des fissures ont été détectées lors d'un contrôle, il convient de les éliminer, par exemple par un procédé mécanique, suivi le cas échéant par un rechargement par soudure.First, if cracks have been detected during of a control, they should be eliminated, for example by a mechanical process, followed if necessary by a reloading by welding.

L'écran thermique 35 est modifié. Sa partie périphérique 16, sensiblement centrée sur l'axe 9 et déjà prévue dans les barrières thermiques classiques (voir la référence 13 sur la figure 1), est prolongée par une partie inférieure 17 qui protège le fond 18 de l'enveloppe 12.The heat shield 35 is modified. His part peripheral 16, substantially centered on axis 9 and already provided in conventional thermal barriers (see the reference 13 in FIG. 1), is extended by a part lower 17 which protects the bottom 18 of the casing 12.

La partie inférieure 17 de l'écran thermique peut notamment être constituée par une plaque-disque, pincée entre le fond 18 de l'enveloppe et l'échangeur de chaleur 11.The lower part 17 of the heat shield can in particular be constituted by a disc plate, pinched between the bottom 18 of the casing and the heat exchanger 11.

De préférence, une interface 21 relie la partie périphérique 16 de l'écran à sa partie inférieure 17. Cette interface est conçue pour tenir compte des dilatations différentielles entre les pièces.Preferably, an interface 21 connects the part device 16 of the screen at its lower part 17. This interface is designed to take into account expansions differentials between parts.

La partie inférieure 17 de l'écran thermique est avantageusement posée sur le fond 18 de l'enveloppe et placée bord à bord avec l'interface 21, sans soudure.The lower part 17 of the heat shield is advantageously placed on the bottom 18 of the envelope and placed edge to edge with interface 21, seamless.

A cet effet, la partie inférieure 17 et l'interface 21 comportent, par exemple, des talons complémentaires 46 et 47 ménageant entre eux un jeu annulaire.To this end, the lower part 17 and the interface 21 include, for example, complementary heels 46 and 47 providing an annular clearance between them.

Ainsi, d'éventuelles dilatations différentielles n'entrainent pas de déformations de la partie périphérique 16 de l'écran thermique.Thus, possible differential expansions do not cause deformations of the peripheral part 16 of the heat shield.

L'écran thermique 35 recouvre et protège sensiblement toute la surface interne 36 de l'enveloppe.The heat shield 35 substantially covers and protects the entire internal surface 36 of the envelope.

Un mode préféré de réalisation de la partie périphérique 16 de l'écran thermique a été décrit en référence à la figure 3.A preferred embodiment of the game thermal screen device 16 has been described in reference to figure 3.

La partie périphérique comporte une tôle extérieure 48 et une tôle intérieure 49. Ces deux tôles sont sensiblement cylindriques et centrées sur l'arbre 9. The peripheral part includes an outer sheet 48 and an inner sheet 49. These two sheets are substantially cylindrical and centered on the shaft 9.

La tôle extérieure 48 est reliée à l'interface 21, par l'intermédiaire d'une soudure 50, pour éviter tout passage d'eau entre l'enveloppe 12 et l'écran thermique 16. Un soudage par points est prévu entre la tôle intérieure 49 et l'interface 21.The outer sheet 48 is connected to the interface 21, by through a weld 50, to avoid any passage of water between the casing 12 and the heat shield 16. A spot welding is provided between the inner sheet 49 and interface 21.

Entre les tôles intérieure et extérieure, sont prévues plusieurs tôles 51, sensiblement cylindriques et centrées sur l'arbre 9.Between the inner and outer sheets are provided several sheets 51, substantially cylindrical and centered on the tree 9.

Ces tôles 51 comportent des bossages 52 régulièrement répartis sur leur surface. Les tôles sont placées les unes par rapport aux autres, de telle sorte que les bossages 52 sont en quinconce. Ces bossages permettent de maintenir un espace entre les tôles 51.These sheets 51 have bosses 52 regularly distributed over their surface. The sheets are placed one compared to the others, so that the bosses 52 are staggered. These bosses maintain a space between the sheets 51.

Pour réaliser la nouvelle soudure, il convient tout d'abord de réaliser une gorge 22 dans la bride 10. Elle est sensiblement centrée sur l'axe 9. On se reportera plus particulièrement aux figures 4 et 5.To make the new weld, everything is first make a groove 22 in the flange 10. It is substantially centered on axis 9. We will refer more particularly in Figures 4 and 5.

Le fond de la gorge 22 présente avantageusement une forme courbe pour éviter des amorces de rupture dans la bride.The bottom of the groove 22 advantageously has a curved shape to avoid breaking points in the flange.

Dans la cavité 23 ainsi formée entre la gorge et l'extrémité libre 24 de l'écran thermique 16, est placée une partie supérieure 25 qui prend la forme d'un anneau, sensiblement centré sur l'arbre 9. Cet anneau comporte un dégagement 26. Il est situé en regard de la liaison 27, réalisée entre la bride 10 et la paroi périphérique 19 de l'enveloppe.In the cavity 23 thus formed between the groove and the free end 24 of the heat shield 16 is placed an upper part 25 which takes the form of a ring, substantially centered on the shaft 9. This ring has a clearance 26. It is located opposite the link 27, made between the flange 10 and the peripheral wall 19 of the envelope.

Comme le montre la figure 4, les extrémités en regard de la bride 10 et de la paroi périphérique 19 de l'enveloppe 12 présentent un talon 40, respectivement 41. Les talons sont destinés à être placés bord à bord, un évidement 42 étant ménagé entre la bride 10 et la paroi périphérique 19. As shown in Figure 4, the opposite ends of the flange 10 and of the peripheral wall 19 of the envelope 12 has a heel 40, respectively 41. The heels are intended to be placed edge to edge, a recess 42 being formed between the flange 10 and the wall peripheral 19.

En référence à la figure 5, le dégagement 26 réalisé dans l'anneau 25 permet d'obtenir une soudure à pleine pénétration sans risque d'atteindre l'anneau 25.With reference to FIG. 5, the clearance 26 produced in the ring 25 provides a full weld penetration without risk of reaching the ring 25.

En effet, lors du rétreint de la soudure, l'anneau 25 peut se déplacer librement dans une direction sensiblement parallèle à l'arbre 9, grâce au dégagement 26. Ce dernier supprime tout risque de coincement de l'anneau 25 contre le bourrelet 45 créé lors de l'opération de soudage.Indeed, during the shrinking of the weld, the ring 25 can move freely in a direction substantially parallel to the shaft 9, thanks to the clearance 26. The latter eliminates any risk of jamming of the ring 25 against the bead 45 created during the welding operation.

Cette soudure permet de ne pas introduire d'amorces de fissuration entre la bride et l'enveloppe.This welding does not introduce primers of cracking between the flange and the casing.

L'anneau 25 est avantageusement réalisé en un matériau thermiquement protecteur. L'écran comporte ainsi une partie supérieure qui prolonge la protection dans la bride, au-delà de la liaison 27.The ring 25 is advantageously made of a material thermally protective. The screen thus has a part upper which extends the protection in the flange, beyond of the link 27.

Dans un mode préféré de réalisation, l'anneau 25 comporte, sur sa surface intérieure 43, des plots 44. Ils sont régulièrement répartis sur la surface 43.In a preferred embodiment, the ring 25 has, on its inner surface 43, studs 44. They are regularly distributed over the surface 43.

Ces plots facilitent tout d'abord le positionnement de l'ensemble constitué par l'anneau 25, l'écran thermique 16 et la paroi périphérique 19 de l'enveloppe 42, par rapport à la bride 10.These pads first facilitate the positioning of the assembly constituted by the ring 25, the heat shield 16 and the peripheral wall 19 of the envelope 42, relative to the flange 10.

Les talons 40 et 41 des pièces à souder 10 et 19 sont ainsi aisément placés en vis-à-vis.The heels 40 and 41 of the parts to be welded 10 and 19 are thus easily placed opposite.

Dans la mesure où l'opération de soudage nécessite la présence d'un gaz, par exemple d'Argon pur, les plots permettent également la circulation de ce gaz.Insofar as the welding operation requires the presence of a gas, for example of pure Argon, the studs also allow the circulation of this gas.

La barrière thermique représentée à la figure 6 a été conçue, dès l'origine, conformément à l'invention.The thermal barrier shown in Figure 6 has been designed from the outset in accordance with the invention.

Dans ce cas, on utilise une bride 34 différente de celle utilisée pour une barrière thermique connue. Les trous 30 réalisés dans la bride pour le passage des tubes 28 du serpentin peuvent être positionnés sur un diamètre inférieur à celui qui est classiquement choisi pour les trous 29 d'une barrière thermique conforme à l'état de la technique.In this case, a flange 34 different from that used for a known thermal barrier. The holes 30 made in the flange for the passage of the tubes 28 of the coil can be positioned on a diameter lower than that conventionally chosen for holes 29 of a thermal barrier conforming to the state of the technical.

Par ailleurs, une gorge 31 est réalisée lors de la fabrication de la bride.Furthermore, a groove 31 is produced during the flange manufacturing.

Comme représenté à la figure 2, l'écran thermique est constitué d'une partie périphérique 16 et d'une partie inférieure 17, protégeant la partie périphérique 19 et le fond 18 de l'enveloppe.As shown in Figure 2, the heat shield is consisting of a peripheral part 16 and a part lower 17, protecting the peripheral part 19 and the bottom 18 of the envelope.

De préférence, une interface 21 est prévue entre la partie périphérique 19 et le fond 18 pour compenser les dilatations différentielles entre les pièces.Preferably, an interface 21 is provided between the peripheral part 19 and bottom 18 to compensate for differential expansions between parts.

Sensiblement toute la surface interne 36 de l'enveloppe est ainsi thermiquement protégée.Substantially the entire internal surface 36 of the envelope is thus thermally protected.

Dans l'exemple de réalisation représenté à la figure 4, l'écran thermique pourrait comprendre également une partie supérieure 32, placée dans la gorge 31, au-dessus du joint soudé 33 entre l'enveloppe 12 et la bride 10.In the embodiment shown in Figure 4, the heat shield could also include a part upper 32, placed in the groove 31, above the joint welded 33 between the casing 12 and the flange 10.

La partie supérieure 32 permet d'améliorer encore la protection thermique de l'enveloppe et de la bride.The upper part 32 makes it possible to further improve the thermal protection of the enclosure and the flange.

La liaison 33 est, comme le joint soudé 27 illustré aux figures 2 et 3, du type joint bout à bout par soudage à pleine pénétration. Des procédés classiques peuvent être mis en oeuvre à cet effet.The link 33 is, like the welded joint 27 illustrated in Figures 2 and 3, of the butt joint type by welding full penetration. Conventional methods can be implemented for this purpose.

Ce type de joint évite d'introduire des amorces de fissuration dans la bride.This type of joint avoids introducing primers of cracking in the flange.

A titre d'exemple, la soudure entre la bride 10 et la paroi périphérique 19 de l'enveloppe est réalisée en TIG automatique, sous atmosphère d'Argon. Tout autre type de soudure approprié peut être envisagé.For example, the weld between the flange 10 and the peripheral wall 19 of the envelope is made of TIG automatic, under an Argon atmosphere. Any other type of suitable soldering can be considered.

La barrière thermique selon l'invention, obtenue par modification d'une barrière classique déjà en service ou conçue dès l'origine pour présenter les caractéristiques de l'invention, permet ainsi de supprimer les risques de fissuration existant sur les barrières thermiques classiques. Elle contribue à accroítre la sécurité des réacteurs nucléaires.The thermal barrier according to the invention, obtained by modification of a conventional barrier already in service or designed from the outset to present the characteristics of the invention thus eliminates the risks of existing cracking on thermal barriers classics. It contributes to increasing the safety of nuclear reactors.

Les signes de référence insérés après les caractéristiques techniques mentionnées dans les revendications ont pour seul but de faciliter la compréhension de ces dernières et ne sauraient en limiter la portée.The reference signs inserted after the technical characteristics mentioned in the claims are intended only to facilitate the understanding of these and cannot limit them the scope.

Claims (10)

Barrière thermique de pompe primaire comprenant une bride (10, 34), une enveloppe (12), ainsi qu'un échangeur de chaleur (11) et un écran thermique (35) placés à l'intérieur de la cavité délimitée par la bride et l'enveloppe, caractérisée en ce que l'écran thermique (35) recouvre sensiblement toute la surface interne (36) de l'enveloppe (12).Primary pump thermal barrier comprising a flange (10, 34), a casing (12), as well as an exchanger heat (11) and a heat shield (35) placed at the interior of the cavity delimited by the flange and the envelope, characterized in that the heat shield (35) covers substantially the entire internal surface (36) of the envelope (12). Barrière thermique selon la revendication 1, caractérisée en ce qu'elle comporte, entre la bride (10, 34) et l'enveloppe (12), une liaison (27,33) du type joint bout à bout, par soudage à pleine pénétration.Thermal barrier according to claim 1, characterized in that it comprises, between the flange (10, 34) and the casing (12), a joint (27,33) of the joint type butt, by full penetration welding. Barrière thermique selon l'une des revendications 1 ou 2, caractérisée en ce que l'écran thermique (35) comporte une partie périphérique (16) de révolution autour de l'axe (9) de la pompe et une partie inférieure (17), sensiblement perpendiculaire audit axe.Thermal barrier according to one of claims 1 or 2, characterized in that the heat shield (35) has a peripheral part (16) of revolution around the axis (9) of the pump and a lower part (17), substantially perpendicular to said axis. Barrière thermique selon la revendication 3, caractérisée en ce que la partie périphérique (16) de l'écran thermique est constituée par des tôles (48, 49, 51) sensiblement cylindriques et centrées sur l'axe (9) de la pompe.Thermal barrier according to claim 3, characterized in that the peripheral part (16) of the heat shield consists of sheets (48, 49, 51) substantially cylindrical and centered on the axis (9) of the pump. Barrière thermique selon la revendication 4, caractérisée en ce qu'une partie desdites tôles (51) comportent des bossages (52), lesdites tôles étant de préférence disposées de telle sorte que les bossages sont en quinconce.Thermal barrier according to claim 4, characterized in that part of said sheets (51) have bosses (52), said sheets being of preferably arranged so that the bosses are in a staggered arrangement. Barrière thermique selon l'une des revendications 3 à 5, caractérisée en ce qu'une interface (21) est placée entre les parties périphérique (16) et inférieure (17).Thermal barrier according to one of claims 3 to 5, characterized in that an interface (21) is placed between the peripheral (16) and lower (17) parts. Barrière thermique selon l'une des revendications 3 à 6, caractérisée en ce que la partie inférieure (17) de l'écran thermique est une plaque-disque, posée sur le fond (18) de l'enveloppe (12).Thermal barrier according to one of claims 3 to 6, characterized in that the lower part (17) of the heat shield is a disk plate, placed on the bottom (18) of the envelope (12). Barrière thermique selon l'une des revendications 3 à 7, caractérisée la partie inférieure (17) de l'écran thermique et l'interface (21) comportent des talons complémentaires (46, 47) ménageant entre eux un jeu annulaire.Thermal barrier according to one of claims 3 to 7, characterized the lower part (17) of the screen thermal and interface (21) have heels complementary (46, 47) providing a play between them annular. Barrière thermique selon l'une des revendications 3 à 8, caractérisée en ce qu'une gorge (22, 31) est pratiquée dans la bride (10, 34).Thermal barrier according to one of claims 3 to 8, characterized in that a groove (22, 31) is made in the flange (10, 34). Barrière thermique selon l'une des revendications 2 à 9, caractérisée en ce que l'écran thermique comporte une partie supérieure (25, 32) qui le prolonge dans la bride, au-delà de la liaison soudée (27, 33) entre la bride (10, 34) et l'enveloppe (12).Thermal barrier according to one of claims 2 9, characterized in that the heat shield has a upper part (25, 32) which extends it into the flange, beyond the welded connection (27, 33) between the flange (10, 34) and the envelope (12).
EP97402717A 1996-11-22 1997-11-13 Thermal barrier for primary pump Withdrawn EP0844399A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9614328 1996-11-22
FR9614328A FR2756328B1 (en) 1996-11-22 1996-11-22 PRIMARY PUMP THERMAL BARRIER

Publications (1)

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EP0844399A1 true EP0844399A1 (en) 1998-05-27

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EP97402717A Withdrawn EP0844399A1 (en) 1996-11-22 1997-11-13 Thermal barrier for primary pump

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EP (1) EP0844399A1 (en)
FR (1) FR2756328B1 (en)
ZA (1) ZA9710212B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2812117A1 (en) * 2000-07-24 2002-01-25 Jeumont Ind Thermal protection screen, for rotary shaft especially for primary pump in nuclear power plant, has sleeve fixed to shaft enclosing metal ring
WO2001066951A3 (en) * 2000-03-07 2002-10-17 Westinghouse Electric Corp Thermal barrier for reactor coolant pump
FR2832543A1 (en) * 2001-11-21 2003-05-23 Jeumont Sa Protective thermal screen, for rotary shaft, e.g. of nuclear power station primary pump, has fretted nickel alloy ring on shaft surface
WO2003091572A1 (en) * 2002-04-26 2003-11-06 Allweiler Ag Centrifugal pump, in particular spirally-housed centrifugal pump for a heat exchange medium
FR3002295A1 (en) * 2013-02-20 2014-08-22 Jspm Jeumont Systemes De Pompes Et De Mecanismes PUMP COMPRISING A SCREEN FOR PROTECTING THE PUMP WHEEL AGAINST A FLOW OF A COOLING FLUID ALONG THE HUB OF THE WHEEL
FR3045110A1 (en) * 2015-12-14 2017-06-16 Areva PUMP FOR A HEAT PUMP, NUCLEAR REACTOR EQUIPPED WITH SUCH A PUMP
WO2018185096A1 (en) * 2017-04-04 2018-10-11 Framatome Pump for a nuclear reactor
EP2477731B1 (en) * 2009-09-15 2020-05-20 Flowserve Management Company Vertically rotatable shaft assembly with thermally insulated housing
CN114352576A (en) * 2021-12-17 2022-04-15 哈尔滨电气动力装备有限公司 Heat shield of modular small reactor shielding type nuclear main pump

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FR2165510A5 (en) * 1971-12-14 1973-08-03 Westinghouse Electric Corp
FR2649165A1 (en) * 1989-06-29 1991-01-04 Jeumont Schneider Wheel-shaft connection, particularly for a cooling pump of a nuclear reactor
US5246337A (en) * 1992-04-09 1993-09-21 Bw/Ip International, Inc. Heat exchanger with hydrostatic bearing return flow guide

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FR2039971A5 (en) * 1969-03-25 1971-01-15 Westinghouse Electric Corp
FR2165510A5 (en) * 1971-12-14 1973-08-03 Westinghouse Electric Corp
FR2649165A1 (en) * 1989-06-29 1991-01-04 Jeumont Schneider Wheel-shaft connection, particularly for a cooling pump of a nuclear reactor
US5246337A (en) * 1992-04-09 1993-09-21 Bw/Ip International, Inc. Heat exchanger with hydrostatic bearing return flow guide

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4859162B2 (en) * 2000-03-07 2012-01-25 ウエスチングハウス・エレクトリック・カンパニー・エルエルシー Reactor coolant pump thermal barrier
JP2003526051A (en) * 2000-03-07 2003-09-02 ウエスチングハウス・エレクトリック・カンパニー・エルエルシー Thermal barrier and reactor coolant pump incorporating it
KR100730857B1 (en) 2000-03-07 2007-06-20 웨스팅하우스 일레트릭 캄파니 엘엘씨 Reactor coolant pump
WO2001066951A3 (en) * 2000-03-07 2002-10-17 Westinghouse Electric Corp Thermal barrier for reactor coolant pump
FR2812117A1 (en) * 2000-07-24 2002-01-25 Jeumont Ind Thermal protection screen, for rotary shaft especially for primary pump in nuclear power plant, has sleeve fixed to shaft enclosing metal ring
FR2832543A1 (en) * 2001-11-21 2003-05-23 Jeumont Sa Protective thermal screen, for rotary shaft, e.g. of nuclear power station primary pump, has fretted nickel alloy ring on shaft surface
EP1314895A1 (en) * 2001-11-21 2003-05-28 Jeumont S.A. Thermal barrier for rotating shaft
US7021908B2 (en) 2001-11-21 2006-04-04 Jeumont S.A. Thermal protection shield for a rotating shaft
WO2003091572A1 (en) * 2002-04-26 2003-11-06 Allweiler Ag Centrifugal pump, in particular spirally-housed centrifugal pump for a heat exchange medium
EP2477731B1 (en) * 2009-09-15 2020-05-20 Flowserve Management Company Vertically rotatable shaft assembly with thermally insulated housing
FR3002295A1 (en) * 2013-02-20 2014-08-22 Jspm Jeumont Systemes De Pompes Et De Mecanismes PUMP COMPRISING A SCREEN FOR PROTECTING THE PUMP WHEEL AGAINST A FLOW OF A COOLING FLUID ALONG THE HUB OF THE WHEEL
WO2014128028A1 (en) * 2013-02-20 2014-08-28 Areva Np Pump including a shield for protecting a pump wheel against a coolant leak along the hub of the wheel
FR3045110A1 (en) * 2015-12-14 2017-06-16 Areva PUMP FOR A HEAT PUMP, NUCLEAR REACTOR EQUIPPED WITH SUCH A PUMP
WO2017102730A1 (en) * 2015-12-14 2017-06-22 Areva Np Pump for a heat-transfer fluid and nuclear reactor comprising such a pump
CN108700077A (en) * 2015-12-14 2018-10-23 法马通公司 For heat-transfer fluid pump and include the nuclear reactor of this pump
WO2018185096A1 (en) * 2017-04-04 2018-10-11 Framatome Pump for a nuclear reactor
CN114352576A (en) * 2021-12-17 2022-04-15 哈尔滨电气动力装备有限公司 Heat shield of modular small reactor shielding type nuclear main pump

Also Published As

Publication number Publication date
ZA9710212B (en) 1998-06-03
FR2756328B1 (en) 1998-12-31
FR2756328A1 (en) 1998-05-29

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