EP1314895A1 - Thermal barrier for rotating shaft - Google Patents

Thermal barrier for rotating shaft Download PDF

Info

Publication number
EP1314895A1
EP1314895A1 EP02292872A EP02292872A EP1314895A1 EP 1314895 A1 EP1314895 A1 EP 1314895A1 EP 02292872 A EP02292872 A EP 02292872A EP 02292872 A EP02292872 A EP 02292872A EP 1314895 A1 EP1314895 A1 EP 1314895A1
Authority
EP
European Patent Office
Prior art keywords
ring
nickel alloy
shaft
pin
screen according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02292872A
Other languages
German (de)
French (fr)
Other versions
EP1314895B1 (en
Inventor
Louis Mazuy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva NP SAS
Original Assignee
Jeumont SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jeumont SA filed Critical Jeumont SA
Priority to SI200230888T priority Critical patent/SI1314895T1/en
Publication of EP1314895A1 publication Critical patent/EP1314895A1/en
Application granted granted Critical
Publication of EP1314895B1 publication Critical patent/EP1314895B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • 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
    • F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
    • 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 present invention relates to a thermal protection screen for a rotating shaft, in particular for a primary plant pump shaft nuclear.
  • these primary pumps have a heat exchanger called a thermal barrier, which cools the water supplying a hydrodynamic bearing and rotating seals with the shaft longitudinal. There is therefore a transition zone between hot water and water cold located at the bottom of the thermal barrier.
  • the part of the tree located in this transition zone is by therefore subject to a significant thermal gradient which favors thermal instabilities which can create cracks in the tree.
  • a heat shield is placed on the tree in the area where the thermal gradient is greatest.
  • this heat shield is formed by a ring in stainless steel surrounding the shaft in said transition zone. This solution does not enough to fully guard against the risk of cracking, because after a few years of operation, the cracks may appear in various places in the tree below this ring.
  • the invention aims to provide a protective screen thermal which improves the efficiency of the protection and thereby reduce the risk of cracking in the tree.
  • the invention therefore relates to a thermal protection screen for a rotating shaft, in particular for a primary plant pump shaft nuclear, characterized in that it comprises, in the thermal transition zone between the hot fluid and the cold fluid, a nickel alloy ring shrunk onto said tree.
  • Fig. 1 there is shown schematically a part of a primary pump of a nuclear power station and which is intended to convey water hot at a temperature of the order of 300 ° C.
  • this pump has a lower part Said hot in which circulates hot water at the temperature of approximately 300 ° C and a so-called cold upper part B in which the cold water circulates about 40 ° C.
  • Zones A and B are crossed by a tree 1 and the part lower comprises, in a conventional manner, a wheel 2 and a pump casing 3.
  • the upper part B comprises a casing 4, a bearing hydrodynamics 5 and rotary seals 6.
  • the casing 4 is fixed to the volute 3 by means of connecting elements 7 removable, such as studs.
  • the pump Between the lower part A and the upper part B, the pump includes a heat exchanger 8 called a thermal barrier, which cools the water supplying the hydrodynamic bearing 5 and the rotary seals 6.
  • transition zone C Between the lower part A called hot and the upper part B so-called cold, there is a transition zone C between hot water and cold water at bottom of the heat exchanger 8 and in which the shaft area is subjected to a large thermal gradient of around 260 ° C.
  • the shaft 1 is equipped with a screen for thermal protection designated as a whole by the reference 10.
  • the thermal protection screen 10 comprises, in the transition zone thermal C between the hot fluid and the cold fluid, a ring 11 of alloy nickel hooped over its entire length on said shaft 1.
  • the nickel alloy constituting the ring 11 is chosen so that the metal / metal contact between the shaft 1 which is made of austenitic stainless steel and this nickel alloy ring 11 is kept in common situations of operation.
  • the characteristics of the nickel alloy allow this contact thanks to its lower expansion coefficient than that of metal constituting the tree 1 and also by its capacity to support the transients thermal without plasticizing.
  • the protective screen 10 also includes a pin 12 transverse nickel alloy ensuring the connection of the ring 11 with the shaft 1.
  • This pin 12 is mounted in an orifice 13 formed in the shaft 1 and in the ring 10 and the free end 12a of this pin 12 is welded to this ring 11.
  • the ring 11 made of nickel alloy is surrounded by an outer ring 15 made of steel austenitic stainless.
  • This outer ring 15 is hooped at each of its ends on the ring 11 made of nickel alloy and has between the two ends hooped, a cylindrical recess 16 to form a play with the external surface of said ring 11.
  • the outer ring 15 protects the alloy ring 11 from nickel against the instabilities of the transition zone between hot water and water Cold.
  • the clearance formed by the recess 16 is fixed in such a way that the outer ring 15 deformed by the thermal gradient in nominal situation of operation comes into contact with the outer surface of the ring 11 in nickel alloy.
  • This deformation eliminates or minimizes the film of water that can circulate between the two rings 11 and 15 because the circulation of water between said rings promotes thermal fatigue.
  • Thermal insulation is also improved thanks to the presence of the ring 11 made of nickel alloy which has a low conductivity.
  • the total length of the hoop ends of the outer ring 15 on the nickel alloy ring 11 represents approximately 20% the length of this outer ring 15.
  • the protective screen 10 comprises a transverse pin 17 made of austenitic stainless steel for connecting the rings 11 and 15 with the shaft 1.
  • This pin 17 is mounted in an orifice 18 formed in the shaft 1 and the rings 11 and 15 and the free end 17a of this pin 17 is welded to the outer ring 15.
  • the wall of the recess cylindrical 16 of the outer ring 15 has annular portions 16a in projection to reduce the clearance between the wall of the recess and the external face of the ring 11 made of nickel alloy.
  • the protruding portions 16a are distributed so equidistant.
  • the shaft 1 After disassembly of the ring 11 made of nickel alloy and possibly from the outer ring 15, the shaft 1 is hollowed out locally to eliminate cracks.
  • a split ring 20 is arranged and the adjacent edges of the slot 21 of this ring 20 are joined together by a weld bead 22 (Fig. 6), or by at least one radial pin 23 (Fig. 7) or by gluing or by means of a wire winding.
  • This winding is placed in a groove, not shown, formed in the ring 20, preferably in the upper part of this ring 20.
  • the width of this groove is determined to receive at least two turns of wire, the latter is welded at its two ends in the bottom of the groove.
  • the ring 11 or the rings 11 and 15 according to the embodiment, are then again mounted on the shaft 1.
  • the split ring 20 is made of a material whose expansion coefficient is identical to the material of the shaft 1.
  • the hooping of the ring 11 made of nickel alloy, as well as the setting in place of the split ring 20 avoid the presence of moving water and therefore provide effective thermal protection.
  • the thermal protection screen according to the invention makes it possible to obtain more effective thermal protection of the tree thanks in particular to the presence of the nickel alloy ring, while keeping the same size to the solutions used so far.

Landscapes

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

Abstract

The protective thermal screen comprises a ring (11) of a nickel alloy fretted to the shaft (1) in the thermal transition zone between hot and cold fluids, fastened to the shaft by a transverse nickel alloy peg (12). The nickel alloy ring can be surrounded by an outer ring of austenitic stainless steel fretted at its two ends, with a cylindrical cavity forming a clearance between the two ends, the outer ring having a series of inner annular projections forming zones where the clearance is reduced.

Description

La présente invention concerne un écran de protection thermique pour un arbre tournant, notamment pour un arbre de pompe primaire de centrale nucléaire.The present invention relates to a thermal protection screen for a rotating shaft, in particular for a primary plant pump shaft nuclear.

De nombreuses installations industrielles comportent des arbres tournants qui sont soumis à des différentiels de températures entre deux zones engendrant sur ces arbres des variations de contraintes thermiques importantes.Many industrial facilities have trees turning points which are subject to temperature differentials between two zones generating significant thermal stress variations on these trees.

C'est le cas notamment pour les pompes primaires de centrale nucléaire qui véhiculent de l'eau chaude à haute température.This is particularly the case for primary plant pumps that carry hot water at high temperature.

Dans leur partie haute, ces pompes primaires comportent un échangeur de chaleur appelé barrière thermique, qui refroidit l'eau alimentant un palier hydrodynamique et les joints tournants d'étanchéité avec l'arbre longitudinal. Il existe donc une zone de transition entre l'eau chaude et l'eau froide située au bas de la barrière thermique.In their upper part, these primary pumps have a heat exchanger called a thermal barrier, which cools the water supplying a hydrodynamic bearing and rotating seals with the shaft longitudinal. There is therefore a transition zone between hot water and water cold located at the bottom of the thermal barrier.

La partie de l'arbre située dans cette zone de transition est par conséquent soumise à un important gradient thermique qui favorise les instabilités thermiques pouvant créer des fissures dans l'arbre.The part of the tree located in this transition zone is by therefore subject to a significant thermal gradient which favors thermal instabilities which can create cracks in the tree.

Afin de réduire ce risque de fissurations, un écran thermique est disposé sur l'arbre dans la zone où le gradient thermique est le plus important.To reduce the risk of cracking, a heat shield is placed on the tree in the area where the thermal gradient is greatest.

Jusqu'à présent, cet écran thermique est formé par une bague en acier inoxydable entourant l'arbre dans ladite zone de transition. Cette solution ne suffit pas pour se prémunir totalement du risque de fissuration, car après quelques années de fonctionnement, les fissures peuvent apparaítre en divers endroits dans l'arbre au-dessous de cette bague.So far, this heat shield is formed by a ring in stainless steel surrounding the shaft in said transition zone. This solution does not enough to fully guard against the risk of cracking, because after a few years of operation, the cracks may appear in various places in the tree below this ring.

L'invention a pour but de proposer un écran de protection thermique qui permet d'améliorer l'efficacité de la protection et de ce fait de diminuer les risques de fissuration dans l'arbre.The invention aims to provide a protective screen thermal which improves the efficiency of the protection and thereby reduce the risk of cracking in the tree.

L'invention a donc pour objet un écran de protection thermique pour un arbre tournant, notamment pour un arbre de pompe primaire de centrale nucléaire, caractérisé en ce qu'il comprend, dans la zone de transition thermique entre le fluide chaud et le fluide froid, une bague en alliage de nickel frettée sur ledit arbre.The invention therefore relates to a thermal protection screen for a rotating shaft, in particular for a primary plant pump shaft nuclear, characterized in that it comprises, in the thermal transition zone between the hot fluid and the cold fluid, a nickel alloy ring shrunk onto said tree.

Selon d'autres caractéristiques de l'invention :

  • la bague en alliage de nickel est entourée d'une bague externe en acier inoxydable austénitique frettée à chacune de ses extrémités sur cette bague en alliage de nickel et comportant, entre les deux extrémités frettées, un évidement cylindrique pour former un jeu avec la surface externe de ladite bague en alliage de nickel,
  • la paroi de l'évidement cylindrique de la bague externe comporte des portions annulaires en saillie de réduction du jeu entre ladite paroi et la face externe de la bague en alliage de nickel,
  • la longueur totale des extrémités frettées de la bague externe représente environ 20% de la longueur de cette bague,
  • l'écran comporte un pion transversal en alliage de nickel de liaison de la bague en alliage de nickel avec l'arbre, ledit pion étant monté dans un orifice ménagé dans l'arbre et la bague et l'extrémité libre de ce pion étant soudée sur cette bague,
  • l'écran comporte un pion transversal en acier inoxydable austénitique de liaison de la bague en alliage de nickel et de la bague externe en acier inoxydable austénitique avec l'arbre, ledit pion étant monté dans un orifice ménagé dans l'arbre et les bagues et l'extrémité libre de ce pion étant soudée sur la bague externe,
  • l'arbre comporte, au niveau de la partie inférieure de la bague en alliage de nickel, un évidemment dans lequel est montée une bague fendue,
  • la bague fendue est réalisée en un matériau dont le coefficient de dilatation est identique au matériau de l'arbre.
According to other characteristics of the invention:
  • the nickel alloy ring is surrounded by an external austenitic stainless steel ring hooped at each of its ends on this nickel alloy ring and comprising, between the two hooped ends, a cylindrical recess to form a play with the external surface of said nickel alloy ring,
  • the wall of the cylindrical recess of the outer ring has annular protruding portions for reducing the clearance between said wall and the outer face of the nickel alloy ring,
  • the total length of the hooped ends of the outer ring represents approximately 20% of the length of this ring,
  • the screen comprises a transverse nickel alloy pin connecting the nickel alloy ring with the shaft, said pin being mounted in an orifice made in the shaft and the ring and the free end of this pin being welded on this ring,
  • the screen comprises a transverse pin of austenitic stainless steel connecting the nickel alloy ring and the outer ring of austenitic stainless steel with the shaft, said pin being mounted in an orifice made in the shaft and the rings and the free end of this pin being welded to the outer ring,
  • the shaft comprises, at the level of the lower part of the nickel alloy ring, a recess in which a split ring is mounted,
  • the split ring is made of a material whose expansion coefficient is identical to the material of the shaft.

Les caractéristiques et avantages de l'invention apparaítront au cours de la description qui va suivre, donnée à titre d'exemple et faite en référence aux dessins annexés, sur lesquels :

  • la Fig. 1 est une demi-vue schématique en coupe axiale d'une partie d'une pompe primaire équipée d'un écran de protection thermique conforme à l'invention,
  • la Fig. 2 est une vue schématique en coupe axiale et à plus grande échelle d'un premier mode de réalisation de l'écran de protection thermique conforme à l'invention,
  • la Fig. 3 est une vue schématique en coupe axiale et à plus grande échelle d'un deuxième mode de réalisation de l'écran de protection thermique conforme à l'invention,
  • la Fig. 4 est une vue à plus grande échelle du détail A de la Fig. 3,
  • la Fig. 5 est une vue schématique en coupe axiale et à plus grande échelle d'un troisième mode de réalisation de l'écran de protection thermique conforme à l'invention, et
  • la Fig. 6 est une vue partielle en coupe selon la ligne 6-6 de la Fig. 5, selon un premier mode de réalisation,
  • la Fig. 7 est une vue partielle en coupe selon la ligne 6-6 de la Fig. 5, selon un second mode de réalisation.
The characteristics and advantages of the invention will appear during the description which follows, given by way of example and made with reference to the accompanying drawings, in which:
  • Fig. 1 is a schematic half-view in axial section of a part of a primary pump equipped with a thermal protection screen according to the invention,
  • Fig. 2 is a schematic view in axial section and on a larger scale of a first embodiment of the thermal protection screen according to the invention,
  • Fig. 3 is a schematic view in axial section and on a larger scale of a second embodiment of the thermal protection screen according to the invention,
  • Fig. 4 is an enlarged view of detail A in FIG. 3
  • Fig. 5 is a diagrammatic view in axial section and on a larger scale of a third embodiment of the thermal protection screen according to the invention, and
  • Fig. 6 is a partial sectional view along line 6-6 of FIG. 5, according to a first embodiment,
  • Fig. 7 is a partial sectional view along line 6-6 of FIG. 5, according to a second embodiment.

Sur la Fig. 1, on a représenté schématiquement une partie d'une pompe primaire d'une centrale nucléaire et qui est destinée à véhiculer de l'eau chaude à une température de l'ordre de 300°C.In Fig. 1, there is shown schematically a part of a primary pump of a nuclear power station and which is intended to convey water hot at a temperature of the order of 300 ° C.

De manière classique, cette pompe comporte une partie inférieure A dite chaude dans laquelle circule l'eau chaude à la température d'environ 300°C et une partie supérieure B dite froide dans laquelle circule l'eau froide à environ 40°C.Conventionally, this pump has a lower part Said hot in which circulates hot water at the temperature of approximately 300 ° C and a so-called cold upper part B in which the cold water circulates about 40 ° C.

Les zones A et B sont traversées par un arbre 1 et la partie inférieure comporte, de manière classique, une roue 2 et une volute de pompe 3.Zones A and B are crossed by a tree 1 and the part lower comprises, in a conventional manner, a wheel 2 and a pump casing 3.

La partie supérieure B comporte un carter 4, un palier hydrodynamique 5 et des joints tournants d'étanchéité 6.The upper part B comprises a casing 4, a bearing hydrodynamics 5 and rotary seals 6.

Le carter 4 est fixé à la volute 3 au moyen d'éléments de liaison 7 démontables, comme par exemple des goujons.The casing 4 is fixed to the volute 3 by means of connecting elements 7 removable, such as studs.

Entre la partie inférieure A et la partie supérieure B, la pompe comporte un échangeur de chaleur 8 appelé barrière thermique, qui refroidit l'eau alimentant le palier hydrodynamique 5 et les joints tournants d'étanchéité 6.Between the lower part A and the upper part B, the pump includes a heat exchanger 8 called a thermal barrier, which cools the water supplying the hydrodynamic bearing 5 and the rotary seals 6.

Entre la partie inférieure A dite chaude et la partie supérieure B dite froide, il existe une zone de transition C entre l'eau chaude et l'eau froide au bas de l'échangeur de chaleur 8 et dans laquelle la zone de l'arbre est soumise à un important gradient thermique de 260°C environ. Between the lower part A called hot and the upper part B so-called cold, there is a transition zone C between hot water and cold water at bottom of the heat exchanger 8 and in which the shaft area is subjected to a large thermal gradient of around 260 ° C.

Dans cette zone de transition C, l'arbre 1 est équipé d'un écran de protection thermique désigné dans son ensemble par la référence 10.In this transition zone C, the shaft 1 is equipped with a screen for thermal protection designated as a whole by the reference 10.

Selon un premier mode de réalisation représenté à la Fig. 2, l'écran de protection thermique 10 comprend, dans la zone de transition thermique C entre le fluide chaud et le fluide froid, une bague 11 en alliage de nickel frettée sur toute sa longueur sur ledit arbre 1.According to a first embodiment shown in FIG. 2 the thermal protection screen 10 comprises, in the transition zone thermal C between the hot fluid and the cold fluid, a ring 11 of alloy nickel hooped over its entire length on said shaft 1.

L'alliage de nickel constituant la bague 11 est choisi pour que le contact métal/métal entre l'arbre 1 qui est en acier inoxydable austénitique et cette bague 11 en alliage de nickel soit conservé dans les situations courantes de fonctionnement.The nickel alloy constituting the ring 11 is chosen so that the metal / metal contact between the shaft 1 which is made of austenitic stainless steel and this nickel alloy ring 11 is kept in common situations of operation.

Les caractéristiques de l'alliage de nickel permettent d'assurer ce contact grâce à son coefficient de dilatation plus faible que celui du métal constituant l'arbre 1 et aussi par sa capacité à supporter les transitoires thermiques sans se plastifier.The characteristics of the nickel alloy allow this contact thanks to its lower expansion coefficient than that of metal constituting the tree 1 and also by its capacity to support the transients thermal without plasticizing.

Un des alliages les plus performants pour cette fonction est par exemple "l'inconel 718".One of the best performing alloys for this function is by example "inconel 718".

L'écran de protection 10 comporte également un pion 12 transversal en alliage de nickel assurant la liaison de la bague 11 avec l'arbre 1. Ce pion 12 est monté dans un orifice 13 ménagé dans l'arbre 1 et dans la bague 10 et l'extrémité libre 12a de ce pion 12 est soudée sur cette bague 11.The protective screen 10 also includes a pin 12 transverse nickel alloy ensuring the connection of the ring 11 with the shaft 1. This pin 12 is mounted in an orifice 13 formed in the shaft 1 and in the ring 10 and the free end 12a of this pin 12 is welded to this ring 11.

Selon un deuxième mode de réalisation représenté à la Fig. 3, la bague 11 en alliage de nickel est entourée d'une bague externe 15 en acier inoxydable austénitique.According to a second embodiment shown in FIG. 3, the ring 11 made of nickel alloy is surrounded by an outer ring 15 made of steel austenitic stainless.

Cette bague externe 15 est frettée à chacune de ses extrémités sur la bague 11 en alliage de nickel et comporte entre les deux extrémités frettées, un évidement cylindrique 16 pour former un jeu avec la surface externe de la dite bague 11.This outer ring 15 is hooped at each of its ends on the ring 11 made of nickel alloy and has between the two ends hooped, a cylindrical recess 16 to form a play with the external surface of said ring 11.

Ainsi, la bague externe 15 protège la bague 11 en alliage de nickel contre les instabilités de la zone de transition entre l'eau chaude et l'eau froide.Thus, the outer ring 15 protects the alloy ring 11 from nickel against the instabilities of the transition zone between hot water and water Cold.

Le jeu formé par l'évidement 16 est fixé de telle manière que la bague externe 15 déformée par le gradient thermique en situation nominale de fonctionnement vienne en contact avec la surface externe de la bague 11 en alliage de nickel.The clearance formed by the recess 16 is fixed in such a way that the outer ring 15 deformed by the thermal gradient in nominal situation of operation comes into contact with the outer surface of the ring 11 in nickel alloy.

Cette déformation permet de supprimer ou de minimiser le film d'eau pouvant circuler entre les deux bagues 11 et 15 car la circulation de l'eau entre lesdites bagues favorise la fatigue thermique.This deformation eliminates or minimizes the film of water that can circulate between the two rings 11 and 15 because the circulation of water between said rings promotes thermal fatigue.

L'isolation thermique est également améliorée grâce à la présence de la bague 11 en alliage de nickel qui présente une faible conductivité.Thermal insulation is also improved thanks to the presence of the ring 11 made of nickel alloy which has a low conductivity.

De préférence, la longueur totale des extrémités frettées de la bague externe 15 sur la bague 11 en alliage de nickel représente environ 20% de la longueur de cette bague externe 15.Preferably, the total length of the hoop ends of the outer ring 15 on the nickel alloy ring 11 represents approximately 20% the length of this outer ring 15.

Dans ce mode de réalisation également, l'écran de protection 10 comporte un pion transversal 17 en acier inoxydable austénitique de liaison des bagues 11 et 15 avec l'arbre 1. Ce pion 17 est monté dans un orifice 18 ménagé dans l'arbre 1 et les bagues 11 et 15 et l'extrémité libre 17a de ce pion 17 est soudée sur la bague externe 15.Also in this embodiment, the protective screen 10 comprises a transverse pin 17 made of austenitic stainless steel for connecting the rings 11 and 15 with the shaft 1. This pin 17 is mounted in an orifice 18 formed in the shaft 1 and the rings 11 and 15 and the free end 17a of this pin 17 is welded to the outer ring 15.

Selon une variante représentée à la Fig. 4, la paroi de l'évidement cylindrique 16 de la bague externe 15 comporte des portions annulaires 16a en saillie permettant de réduire le jeu entre la paroi de l'évidement et la face externe de la bague 11 en alliage de nickel.According to a variant shown in FIG. 4, the wall of the recess cylindrical 16 of the outer ring 15 has annular portions 16a in projection to reduce the clearance between the wall of the recess and the external face of the ring 11 made of nickel alloy.

De préférence, les portions en saillie 16a sont réparties de façon équidistante.Preferably, the protruding portions 16a are distributed so equidistant.

Au cours d'une opération de maintenance relative à la surveillance de l'état superficiel de l'arbre 1 dans la zone critique, on opère systématiquement au retrait de la bague 11 en alliage de nickel. Dans le cas où la zone de l'arbre à protéger par l'écran thermique comporte des fissures peu profondes, ces fissures peuvent être éliminées de la façon suivante.During a maintenance operation relating to the monitoring of the surface state of the shaft 1 in the critical zone, we operate systematically when removing the nickel alloy ring 11. In the case where the area of the tree to be protected by the heat shield has little cracks these cracks can be removed as follows.

Après démontage de la bague 11 en alliage de nickel et éventuellement de la bague externe 15, l'arbre 1 est creusé localement pour éliminer les fissures.After disassembly of the ring 11 made of nickel alloy and possibly from the outer ring 15, the shaft 1 is hollowed out locally to eliminate cracks.

Ainsi que représenté à la Fig. 5, dans l'évidement ainsi formé sur l'arbre 1, une bague fendue 20 est disposée et les bords adjacents de la fente 21 de cette bague 20 sont solidarisés entre eux par un cordon de soudure 22 (Fig. 6), ou par au moins un pion radial 23 (Fig. 7) ou par collage ou au moyen d'un enroulement de fil. Cet enroulement est placé dans une gorge, non représentée, ménagée dans la bague 20, de préférence dans la partie haute de cette bague 20. La largeur de cette gorge est déterminée pour recevoir au minimum deux spires de fil, ce dernier est soudé à ses deux extrémités dans le fond de la gorge.As shown in FIG. 5, in the recess thus formed on the shaft 1, a split ring 20 is arranged and the adjacent edges of the slot 21 of this ring 20 are joined together by a weld bead 22 (Fig. 6), or by at least one radial pin 23 (Fig. 7) or by gluing or by means of a wire winding. This winding is placed in a groove, not shown, formed in the ring 20, preferably in the upper part of this ring 20. The width of this groove is determined to receive at least two turns of wire, the latter is welded at its two ends in the bottom of the groove.

La bague 11 ou les bagues 11 et 15 selon le mode de réalisation, sont ensuite de nouveau montées sur l'arbre 1.The ring 11 or the rings 11 and 15 according to the embodiment, are then again mounted on the shaft 1.

De préférence, la bague fendue 20 est réalisée en un matériau dont le coefficient de dilatation est identique au matériau de l'arbre 1.Preferably, the split ring 20 is made of a material whose expansion coefficient is identical to the material of the shaft 1.

Le frettage de la bague 11 en alliage de nickel, ainsi que la mise en place de la bague fendue 20 évitent la présence d'eau en mouvement et assurent donc une protection thermique efficace.The hooping of the ring 11 made of nickel alloy, as well as the setting in place of the split ring 20 avoid the presence of moving water and therefore provide effective thermal protection.

L'écran de protection thermique selon l'invention permet d'obtenir une protection thermique plus efficace de l'arbre grâce notamment à la présence de la bague en alliage de nickel, tout en conservant un encombrement identique aux solutions utilisées jusqu'à présent.The thermal protection screen according to the invention makes it possible to obtain more effective thermal protection of the tree thanks in particular to the presence of the nickel alloy ring, while keeping the same size to the solutions used so far.

Dans ces conditions, les gradients thermiques dans l'arbre sont atténués et se font de manière plus progressive si bien que les risques de fissuration de l'arbre notamment dans le cas d'un arbre de pompe primaire, sont de ce fait diminués.Under these conditions, the thermal gradients in the tree are mitigated and are done more gradually so that the risks of tree cracking especially in the case of a primary pump shaft, are thereby diminished.

Claims (8)

Ecran de protection thermique pour un arbre tournant (1), notamment pour un arbre de pompe primaire de centrale nucléaire, caractérisé en ce qu'il comprend, dans la zone de transition thermique entre le fluide chaud et le fluide froid, une bague (11) en alliage de nickel frettée sur ledit arbre (1).Thermal protection screen for a rotating shaft (1), in particular for a primary pump shaft of a nuclear power plant, characterized in that it comprises, in the zone of thermal transition between the hot fluid and the cold fluid, a ring (11 ) made of nickel alloy hooped on said shaft (1). Ecran selon la revendication 1, caractérisé en ce que la bague (11) en alliage de nickel est entourée d'une bague externe (15) en acier inoxydable austénitique frettée à chacune de ses extrémités sur cette bague (11) en alliage de nickel et comportant, entre les deux extrémités frettées, un évidement cylindrique (16) pour former un jeu avec la surface externe de ladite bague (11) en alliage de nickel.Screen according to claim 1, characterized in that the ring (11) of nickel alloy is surrounded by an external ring (15) of austenitic stainless steel hooped at each of its ends on this ring (11) of nickel alloy and comprising, between the two hooped ends, a cylindrical recess (16) to form a clearance with the external surface of said ring (11) made of nickel alloy. Ecran selon la revendication 2, caractérisé en ce que la paroi de l'évidement cylindrique (16) de la bague externe (15) comporte des portions annulaires (16a) en saillie de réduction du jeu entre ladite paroi et la face externe de la bague (11) en alliage de nickel.Screen according to claim 2, characterized in that the wall of the cylindrical recess (16) of the outer ring (15) has annular portions (16a) projecting to reduce the clearance between said wall and the outer face of the ring (11) made of nickel alloy. Ecran selon la revendication 2 ou 3, caractérisé en ce que la longueur totale des extrémités frettées de la bague externe (15) représente environ 20% de la longueur de cette bague (15).Screen according to claim 2 or 3, characterized in that the total length of the hooped ends of the outer ring (15) represents approximately 20% of the length of this ring (15). Ecran selon la revendication 1, caractérisé en ce qu'il comporte un pion transversal (12) en alliage de nickel de liaison de la bague (11) en alliage de nickel avec l'arbre (1), ledit pion (12) étant monté dans un orifice (13) ménagé dans l'arbre (1) et dans la bague (11) et l'extrémité libre (12a) de ce pion (12) étant soudée sur cette bague (11).Screen according to claim 1, characterized in that it comprises a transverse pin (12) made of nickel alloy connecting the ring (11) made of nickel alloy with the shaft (1), said pin (12) being mounted in an orifice (13) formed in the shaft (1) and in the ring (11) and the free end (12a) of this pin (12) being welded to this ring (11). Ecran selon l'une quelconque des revendications 2 à 3, caractérisé en ce qu'il comporte un pion transversal (17) en acier inoxydable austénitique de liaison de la bague (11) en alliage de nickel et de la bague externe (15) en acier inoxydable austénitique avec l'arbre (1), ledit pion (17) étant monté dans un orifice (18) ménagé dans l'arbre (1) et les bagues (11 ; 15) et l'extrémité libre (17a) de ce pion (17) étant soudée sur la bague externe (15).Screen according to any one of Claims 2 to 3, characterized in that it comprises a transverse pin (17) in austenitic stainless steel for connecting the ring (11) made of nickel alloy and the outer ring (15) in austenitic stainless steel with the shaft (1), said pin (17) being mounted in an orifice (18) formed in the shaft (1) and the rings (11; 15) and the free end (17a) of this pin (17) being welded to the outer ring (15). Ecran selon l'une quelconque des revendications précédentes, caractérisé en ce que l'arbre (1) comporte, au niveau de la partie inférieure de la bague (11) en alliage de nickel, un évidement dans lequel est montée une bague fendue (20).Screen according to any one of the preceding claims, characterized in that the shaft (1) comprises, at the level of the lower part of the ring (11) made of nickel alloy, a recess in which is mounted a split ring (20 ). Ecran selon la revendication 7, caractérisé en ce que la bague fendue (20) est réalisée en un matériau dont le coefficient de dilatation est identique au matériau de l'arbre (1).Screen according to claim 7, characterized in that the split ring (20) is made of a material whose coefficient of expansion is identical to the material of the shaft (1).
EP02292872A 2001-11-21 2002-11-19 Thermal barrier for rotating shaft Expired - Lifetime EP1314895B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200230888T SI1314895T1 (en) 2001-11-21 2002-11-19 Thermal barrier for rotating shaft

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0115076A FR2832543B1 (en) 2001-11-21 2001-11-21 THERMAL PROTECTION SCREEN FOR A ROTATING SHAFT
FR0115076 2001-11-21

Publications (2)

Publication Number Publication Date
EP1314895A1 true EP1314895A1 (en) 2003-05-28
EP1314895B1 EP1314895B1 (en) 2010-01-06

Family

ID=8869642

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02292872A Expired - Lifetime EP1314895B1 (en) 2001-11-21 2002-11-19 Thermal barrier for rotating shaft

Country Status (5)

Country Link
US (1) US7021908B2 (en)
EP (1) EP1314895B1 (en)
ES (1) ES2338991T3 (en)
FR (1) FR2832543B1 (en)
SI (1) SI1314895T1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004052796A1 (en) * 2004-11-02 2006-05-11 Volkswagen Ag Drive shaft with a heat shield sleeve
US9303688B2 (en) * 2013-07-02 2016-04-05 Dresser-Rand Company Thermal barrier coating for bearing journal surfaces of rotary shafts

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4932836A (en) * 1988-06-10 1990-06-12 Bw/Ip International, Inc. Pump with heat exchanger
US5072608A (en) * 1988-05-18 1991-12-17 Bw/Ip International, Inc. Reduction of transient thermal stresses in machine components
EP0844399A1 (en) * 1996-11-22 1998-05-27 Jeumont Industrie Thermal barrier for primary pump
WO2001094069A2 (en) * 2000-06-06 2001-12-13 Westinghouse Electric Company Llc A method of repairing a reactor coolant pump shaft and a reactor coolant pump repaired by such method
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194083A (en) * 1964-05-11 1965-07-13 Gen Electric Hollow power transmission members
GB1151742A (en) * 1965-06-24 1969-05-14 Hayward Tyler & Company Ltd Improvements in or relating to Glandless Electric Motor Driven Pumps
US4127080A (en) * 1977-03-08 1978-11-28 Lakiza Rostislav I Tubular shaft of a marine line shafting
US4820119A (en) * 1988-05-23 1989-04-11 United Technologies Corporation Inner turbine seal
US5332358A (en) * 1993-03-01 1994-07-26 General Electric Company Uncoupled seal support assembly
US6328541B1 (en) * 2000-03-07 2001-12-11 Westinghouse Electric Company Llc Thermal barrier and reactor coolant pump incorporating the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5072608A (en) * 1988-05-18 1991-12-17 Bw/Ip International, Inc. Reduction of transient thermal stresses in machine components
US4932836A (en) * 1988-06-10 1990-06-12 Bw/Ip International, Inc. Pump with heat exchanger
EP0844399A1 (en) * 1996-11-22 1998-05-27 Jeumont Industrie Thermal barrier for primary pump
WO2001094069A2 (en) * 2000-06-06 2001-12-13 Westinghouse Electric Company Llc A method of repairing a reactor coolant pump shaft and a reactor coolant pump repaired by such method
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
US7021908B2 (en) 2006-04-04
ES2338991T3 (en) 2010-05-14
FR2832543B1 (en) 2006-04-14
FR2832543A1 (en) 2003-05-23
SI1314895T1 (en) 2010-05-31
EP1314895B1 (en) 2010-01-06
US20030136553A1 (en) 2003-07-24

Similar Documents

Publication Publication Date Title
CA2400151C (en) Stay sector of stator shroud of the high-pressure turbine of a gas turbine engine with clearance control
CA2777253C (en) Method for protecting the passage of air in a drive part coupling in an unprotected environment, coupling for implementation, and rotor line fitted with such couplings
EP1265035B1 (en) Double mounting of a ceramic matrix composite combustion chamber
EP3759319B1 (en) Assembly for a turbomachine
FR3020408A1 (en) ROTARY ASSEMBLY FOR TURBOMACHINE
WO2015044579A1 (en) Rotary assembly for a turbomachine
EP1314895B1 (en) Thermal barrier for rotating shaft
FR2926612A1 (en) Rotor drum for e.g. turbo-jet engine of aircraft, has cooling units at internal surface and at right of sealing elements to exchange heat by convection between wall and cooling and ventilation air circulating inside walls and between disks
EP0123599B1 (en) Dismountable fastening device for an internal structure in an envelope such as a conduit or a recipient
EP0844399A1 (en) Thermal barrier for primary pump
EP0531202B1 (en) Shrouded turbine guide vane
FR2514099A1 (en) Wedging of metal sleeve inside metal tube - by radial expansion of sleeve, esp. to isolate defect in tube in steam generator of nuclear power station
FR2953252A1 (en) Distribution sector for low pressure turbine of e.g. turbojet of airplane, has outer platform sector comprising stiffeners located in extension of vanes and extended along axis parallel to tangent at upstream and downstream edges of vanes
WO2014128028A1 (en) Pump including a shield for protecting a pump wheel against a coolant leak along the hub of the wheel
FR2812117A1 (en) Thermal protection screen, for rotary shaft especially for primary pump in nuclear power plant, has sleeve fixed to shaft enclosing metal ring
FR2801413A1 (en) Nuclear PWR primary pump has drive shaft end with core forming one end of shaft connected to electric motor rotor
FR2692972A1 (en) Localised repair of heat exchanger tubes - uses neutral atmos. during welding of replacement section to prevent oxidn. in weld
WO2020058648A1 (en) Turbine seal
FR3126445A1 (en) Cooling device for a turbine of a turbomachine
FR3137415A1 (en) Sealing assembly for low pressure turbine stator and low pressure turbine ring comprising such a sealing assembly
FR3022599A1 (en) CYLINDRICAL AND PARTIALLY COATED METALLIC TREE
FR3116558A1 (en) SET OF TURBOMACHINE ROTOR ELEMENTS EQUIPPED WITH SEALING DEVICE.
FR3096411A1 (en) TURBOMACHINE INCLUDING AN ANNULAR FIXING FLANGE
FR2533680A1 (en) Cooler for vertical furnaces.
BE486646A (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

17P Request for examination filed

Effective date: 20031108

AKX Designation fees paid

Designated state(s): BE ES FR GB SE

AXX Extension fees paid

Extension state: SI

Payment date: 20031108

REG Reference to a national code

Ref country code: DE

Ref legal event code: 8566

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE ES FR GB SE

AX Request for extension of the european patent

Extension state: SI

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2338991

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: JSPM

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20100106

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20101007

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

Owner name: AREVA NP

Effective date: 20140109

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20140102 AND 20140108

BECA Be: change of holder's address

Owner name: TOUR AREVA PLACE MILLIER 1,F-92400 COURBEVOIE

Effective date: 20140103

Owner name: AREVA NP

Effective date: 20140103

BECH Be: change of holder

Owner name: AREVA NP

Effective date: 20140103

REG Reference to a national code

Ref country code: SI

Ref legal event code: SP73

Owner name: AREVA NP; FR

Effective date: 20140103

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Owner name: AREVA NP, FR

Effective date: 20140924

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 14

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 16

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20191120

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20191126

Year of fee payment: 18

Ref country code: FR

Payment date: 20191129

Year of fee payment: 18

Ref country code: ES

Payment date: 20191223

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20191122

Year of fee payment: 18

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20201119

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20201130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20201120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201119

REG Reference to a national code

Ref country code: SI

Ref legal event code: KO00

Effective date: 20211202

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20220202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20201130