EP0639741A1 - Heat exchanger with holding means of anti-vibration bars inserted between the bundle tubes - Google Patents

Heat exchanger with holding means of anti-vibration bars inserted between the bundle tubes Download PDF

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Publication number
EP0639741A1
EP0639741A1 EP94401848A EP94401848A EP0639741A1 EP 0639741 A1 EP0639741 A1 EP 0639741A1 EP 94401848 A EP94401848 A EP 94401848A EP 94401848 A EP94401848 A EP 94401848A EP 0639741 A1 EP0639741 A1 EP 0639741A1
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EP
European Patent Office
Prior art keywords
tubes
bundle
heat exchanger
parts
fixing
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
EP94401848A
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German (de)
French (fr)
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EP0639741B1 (en
Inventor
Gérard Boula
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
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Framatome SA
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Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0639741A1 publication Critical patent/EP0639741A1/en
Application granted granted Critical
Publication of EP0639741B1 publication Critical patent/EP0639741B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/10—Water tubes; Accessories therefor
    • F22B37/20—Supporting arrangements, e.g. for securing water-tube sets
    • F22B37/205—Supporting and spacing arrangements for tubes of a tube bundle
    • F22B37/206—Anti-vibration supports for the bends of U-tube steam generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0132—Auxiliary supports for elements for tubes or tube-assemblies formed by slats, tie-rods, articulated or expandable rods

Definitions

  • the invention relates to a heat exchanger and in particular a steam generator of a pressurized water nuclear reactor comprising means for holding antivibration bars interposed between the tubes of the heat exchanger bundle.
  • the steam generators of pressurized water nuclear reactors comprise U-shaped bent tubes having two rectilinear parts or straight branches crimped at their ends in a tubular plate.
  • the straight branches of the bundle tubes are held by spacers arranged parallel to each other, distributed along the length of the straight branches and each comprising a network of through openings to ensure the passage of the tubes.
  • the networks of openings of the tube plate and of the spacer plates are identical and the openings are arranged in these networks, so that the tubes of the bundle constitute parallel flat sheets having a small spacing.
  • the hangers of substantially semi-circular shape are juxtaposed and have decreasing radii of curvature from the outside towards the inside of the bundle.
  • the hangers having the maximum radius of curvature of each of the plies have a decreasing radius from the central part towards the peripheral part of the beam.
  • the curved parts of the tubes constitute a structure of substantially hemispherical shape called a bun at the top of the steam generator bundle.
  • the tubes of the same layer and the adjacent layers are separated by free spaces of small width allowing the passage of the feed water of the steam generator inside the bundle, in contact with the external exchange surface. tubes.
  • pressurized water at high temperature circulates in the bundle tubes and drinking water is brought into contact with the external exchange surface of the tubes along which it moves in the vertical direction by heating and then vaporizing, to come out as vapor at the top of the steam generator.
  • the straight part of the tubes is effectively held by the spacers made in the form of rigid plates.
  • the curved parts of the tubes of the bundle constituting the bun must also be maintained and generally used for this purpose anti-vibration bars which are interposed between the plies of adjacent tubes of the bundle and arranged in substantially radial directions of the bun.
  • These spacer bars can be folded or assembled, so as to have the shape of a V, the two branches of which are directed in service in radial directions of the bun between the plies of tubes of each of the pairs of adjacent plies.
  • the assembly of the steam generator harness is carried out by successive layers, in the envelope of the steam generator placed in a horizontal position on a tacker.
  • the anti-vibration bars which are introduced between the layers of tubes so that their branches have well-defined radial arrangements with respect to the bun are capable of sliding and tilting, so that their installation risks being carried out in a defective manner.
  • the ends of the anti-vibration branches opposite their ends situated towards the central part of the bun are generally projecting with respect to the tubes constituting the outer layer of the bun and connected together by curved bars resting on the surface external of the bun on which the external end parts of the anti-vibration bars are welded.
  • the maintenance of the anti-vibration bars with respect to the other is not ensured during the manufacturing phases subsequent to assembly of the harness, for example when welding the bottom of the steam generator constituting the water box or during the final welding of the steam generator, so that the tilting of the bars or other displacements can occur during manufacture and cause defects in the positioning of the anti-vibration bars and a bending of the plies of tubes, causing the presence of defects in the shape of the bun of the steam generator.
  • the anti-vibration bars which are in contact with a fluid circulating at high speed may be moved inside the bun, because they are connected to each other only by their outer ends and by connecting devices located above the surface of the bun.
  • spacer plates ensuring the maintenance of the straight parts of the tubes of the steam generator are fixed to tie rods perpendicular to the spacer plates and passing through these inside openings which replace tube passage openings in the networks of the plates. spacers.
  • Each of the tie rods is fixed in particular by mechanical assembly parts to the upper spacer of the steam generator, that is to say to the spacer located closest to the curved part of the bundle tubes.
  • the object of the invention is therefore to propose a heat exchanger comprising a bundle of heat exchange tubes bent in a U and each comprising two rectilinear parts and a curved part, a tubular plate and a plurality of parallel spacer plates. between them and spaced along the length of the rectilinear parts of the tubes, in which the tubes of the bundle are engaged inside through openings ensuring the maintenance of the tubes according to flat sheets parallel to each other, tie rods for holding the spacer plates arranged inside the bundle parallel to the straight parts of the tubes and sets of anti-vibration bars interposed between the bent parts of the tubes arranged in adjacent layers, this heat exchanger having a design making it possible to improve the positioning and the maintenance of the anti-vibration bars and tubes, during assembly of the harness as well as maintenance of the anti-vibration bars on the one hand during manufacture and on the other hand during the operation of the heat exchanger.
  • the heat exchanger further comprises, for maintaining at least one set of anti-vibration bars arranged between the tubes of two adjacent plies, at least one metal hoop having a shape analogous to the shape curved parts of the bundle tubes, fixed at each of its ends to the spacer plate located closest to the curved parts of the tubes, in the extension of two tie rods, interposed between two tubes of a sheet of tubes and comprising means for fixing of all the antivibration bars inserted between the ply of tubes in which the arch is arranged and at least one adjacent ply.
  • Figure 1 is an exploded perspective view in partial section of a pressurized water nuclear reactor steam generator according to the invention.
  • FIG. 2 is a sectional view of the upper part of the bundle of the steam generator shown in FIG. 1.
  • FIG. 3 is a top view along 3 in FIG. 2.
  • FIG. 4 is a top view on a large scale along 4-4 of FIG. 2.
  • FIG. 5 is an enlarged view in section through a vertical plane of detail 5 of FIG. 2.
  • the casing 2 contains the bundle of tubes of the steam generator constituted by tubes 5 bent in a U shape and comprising at their upper part, semi-circular hangers 5b and two straight parts 5a.
  • the straight parts 5a of the bundle tubes are crimped at their ends into the tube plate 3, so as to open into a water box 7 in two parts separated by a partition 8.
  • the pressurized water from the nuclear reactor enters one of the parts of the water box 7 via an inlet pipe 6a, flows through the tubes of the bundle and then leaves through an outlet pipe 6b.
  • the bundle of tubes 5 is surrounded by a bundle casing 9 making it possible to channel the feed water entering the casing of the steam generator by an inlet pipe 11.
  • the feed water of the steam generator circulates first from top to bottom in the annular space around the envelope of bundle 9 then from bottom to top in contact with the tubes 5 of the bundle, so as to heat up then to vaporize and to emerge in the form of vapor by the upper tube 12 of the steam generator.
  • the upper part of the bundle of tubes 5 is constituted by the juxtaposition of hangers of semi-circular shape whose radii are decreasing from the outside towards the inside of a flat sheet as shown in FIG. 1.
  • the different successive layers of tubes of the bundle parallel to each other comprise external hangers of decreasing diameters so that the upper part of the bundle constitutes a substantially hemispherical assembly called a bun.
  • the straight parts 5a of the tubes 5 are held by spacer plates 10 which prevent the tubes from vibrating when the steam generator is in operation under the effect of the circulation of exchange fluids.
  • the tubular plate 3 and the spacer plates 10 are pierced in a network of through openings allowing the passage of the straight branches 5a of the tubes 5, for their fixing or their maintenance in an arrangement such that the branches 5a of the tubes are all mutually parallel and arranged in the axial direction of the beam which is the vertical direction when the steam generator 1 is in service in the nuclear reactor.
  • the tubes 5 are arranged in planar plies parallel to each other, because the tubular plate 3 and the spacer plates 10 are pierced with openings aligned in straight rows successive.
  • the two branches of each of the tubes are engaged in two aligned openings in the same row located on either side of the central part of the spacer plates and of the tube plate.
  • the network of openings of the tubular plate and of the spacer plates also constitutes rectilinear rows in a direction perpendicular to the parallel plies of tubes so that the bent tubes are also aligned in a direction perpendicular to the section plane of FIG. 1.
  • bent tubes with a smaller radius of curvature located at the central part of the bundle define a free central aisle inside the bundle on either side of which the rectilinear parts of the tubes are arranged symmetrically.
  • anti-vibration bars 13 each comprising two branches connected to each other at the central part 13a of the anti-vibration bar located inside the beam.
  • the two branches of each of the antivibration bars can be connected to each other in an articulated manner and thus constitute a piece in the form of a compass or be produced in the form of a folded bar, the central part 13a constituting the folded part.
  • the spacer plates 10 are held inside the bundle 4 in parallel arrangements and spaced from one another along the length of the straight branches 5a of the bundle tubes, by tie rods 14 arranged inside the bundle 4 in arrangements parallel to the straight branches 5a of the tubes 5.
  • the tie rods 14 are fixed in the tubular plate 3 and pass through each of the spacer plates 10 inside an opening of the network of openings for crossing the tubes 5.
  • the tie rods 14 are fixed to each of the spacer plates 10 which they pass through, at the level of the corresponding crossing opening, for example by mechanical devices and / or by welds.
  • the straight tie rods 14 are fixed at their upper part to the upper spacer plate 10a, by means of mechanical devices such as nuts and locking washers fixed to a threaded end part of the tie rod protruding above the upper spacer plate 10a.
  • the fastening by nuts of the tie rods 14 is completed by welds, so as to ensure the blocking and the captivity of the fixing parts.
  • FIGS. 1 and 2 there are shown a few tubes 5 of a flat sheet 18 located in the vicinity of the central part of the bundle of the steam generator and a set of four V-shaped anti-vibration bars 13 each having two rectilinear branches arranged in substantially radial directions inside the bun of the bundle 4, in contact with the tubes 5 of the flat sheet 18.
  • the four anti-vibration bars 13 whose branches form variable angles between them constitute a set or set of anti-vibration bars interposed between two adjacent plies 18 of tubes 5 of the bundle.
  • the anti-vibration bars 13 are engaged more or less deeply inside the bun of the bundle 4, so that the successive branches of the different anti-vibration bars make substantially constant angles between them.
  • the set of anti-vibration bars has four bars and eight branches.
  • the anti-vibration bars 13 of a set of bars intended to come into contact with a flat sheet 18 of tubes are placed on the sheet 18 which has just been formed.
  • the anti-vibration bars 13 which are not held are liable to tilt around their internal part 13a, between the two plies of tubes 18 with which they are in contact when the steam generator is rotated about its axis 2 'on the rollers of the tacker, so as to carry out various mounting or welding operations.
  • the sets of anti-vibration bars 13 interposed between certain plies of tubes 18 can be immobilized in a precise mounting position, using a metal hoop 20 having a shape analogous to the shape of the bent parts 5b of the tubes 5, c that is to say a substantially semi-circular shape.
  • the arch 20 is fixed by devices 19 which will be described in more detail in the following description, on the upper spacer plate 10a of the generator. steam, in the extension of two tie rods 14 for holding the spacer plates 10.
  • the sheet of tubes 18 represented in FIGS. 1 and 2 comprises tubes 5 engaged in aligned openings of the spacer plates 10 and of the tube plate 3, two of these openings being reserved for the passage and the fixing of two retaining rods 14 .
  • the arch 20 is made up of successive segments 21 in the shape of a semicircle.
  • the segments 21'a and 21'b situated at the ends of the arch 20 are fixed above the upper face of the upper spacer plate 10a, by means of the fixing devices 19.
  • the successive segments 21 of the arch 20, between the segments 21'a and 21'b, are connected to each other end to end and to the anti-vibration bars 13, by connecting devices 22 which will be described in more detail with reference to Figure 4.
  • FIG. 4 shows two successive segments 21a and 21b of the arch 20 at a connection zone 22 of the segments 21 between them and with two branches of anti-vibration bars 13 inserted between tubes 5 of adjacent layers of the steam generator harness.
  • the segments 21a and 21b are cut in the shape of a semicircle and each have at their ends located opposite at the level of the connection zone 22, a connection yoke.
  • the yokes 22a, 22b of each of the segments 21a and 21b are placed opposite one another and opposite an end portion of the segment on which they are to be assembled.
  • the end parts of the segments 21a and 21b and the yokes 22a, 22b are crossed by openings having a threaded part.
  • the yokes 22a and 22b are offset laterally relative to the median plane of the corresponding segments 21a and 21b, so that in the assembly position of the segments 21a and 21b, there remains a space between the yoke 22a of the segment 21a and the segment 21b and between the yoke 22b of the segment 21b and the segment 21a allowing the introduction and the fixing of a branch of an anti-vibration bar 13.
  • the yokes 22a and 22b and the hoop segments 21a and 21b are capable of securing two branches of anti-vibration bars 13 interposed in two spaces between the ply 18 and an adjacent ply, on one side and the other of the ply 18.
  • the successive segments such as 21a and 21b of the arch 20 are joined together by screws such as 23a and 23b.
  • the two branches of anti-vibration bars 13 arranged on either side of the ply of tubes 18 are clamped and held firmly between the yokes and the end parts of the segments.
  • the device 19 for fixing an end segment such as 21 ′ a of the arch 20 comprises a first element 24 crossed by two successive tapped openings 24 a, 24 b having the same axis, a threaded rod 25 secured to a nut 26 and a second element constituted by the end part of the segment 21'a in which a threaded hole is machined.
  • the device 19 comprising the first element 24, the second element 21'a and the rod 25 constitutes a tensioner making it possible to exert traction on one end of the arch 20 and of securing this arch on the upper spacer plate 10a.
  • the first element 24 has, along its axis, a first tapped opening 24a and a second tapped opening 24b with a diameter less than the diameter of the tapped opening 24a separated by a smooth intermediate opening 24c having an intermediate diameter between the diameter of the openings 24a and 24b and by a groove 24d.
  • the tie rod 14, in the extension of which one end of the ring 20 is placed, comprises a threaded end part 14a projecting above the upper spacer plate 10a.
  • the threaded opening 24a of the element 24 has a diameter and a pitch allowing the fixing by screwing of the element 24 on the end portion 14a of the tie rod 14.
  • a blocking and abutment piece 28 is placed inside the intermediate opening 24c on which the part 14a of the tie rod abuts when the element 24 is screwed.
  • the rod 25 comprises two threaded parts 25a and 25b having reverse pitches, on either side of the nut 26.
  • the end segment 21'a of the hoop 20 has a threaded opening whose diameter and pitch allow the screwing of the part 25a of the rod 25.
  • the threaded opening 24b has a diameter and a pitch allowing the screwing of the part 25b of the rod 25.
  • the rod 25 is screwed into the tapped opening 24b of the element 24 by its part 25b and in the tapped opening of the end segment 21'a of the arch, by its part 25a.
  • the tensioning and fixing of the arch 20 are carried out by means of the nut 26 of the device 19 which constitutes a tensioner.
  • the establishment of the ring 20 can therefore be carried out during the assembly of the bundle, by assembling the successive segments 21 of the ring between them and to the anti-vibration bars placed on either side of the ply of tubes being mounting; the fastening devices 19 at each end of the hoop 20 are put in place and tightened so as to ensure the tension of the hoop 20 and the fixing in place of the two sets of anti-vibration bars 13 arranged on either side of the sheet of tubes 18.
  • the rod 25 can be locked relative to the part 24 by a weld 27, after tightening and tensioning of the ring.
  • FIG. 3 there is shown in a top view, four arches 20a, 20b, 20c and 20d of a steam generator produced according to the invention, the arches 20a and 20b on the one hand and 20c and 20d of on the other hand being symmetrical to each other with respect to the central aisle of the steam generator whose axis 28 has been shown in FIG. 3.
  • the upper spacer plate 10a of the steam generator is pierced with openings arranged in a network allowing the passage of the tubes of the bundle and the tie rods for fixing the spacer plates.
  • FIG 3 there is shown only the end portions of the tie rods 14 fixed on the spacer plate 10a.
  • the arches 20a, 20b, 20c and 20d are fixed by their ends to the spacer plate 10a, each in the extension of two tie rods 14.
  • the tie rods 14 in the extension of which the arches are fixed are all arranged on a circle 29 concentric with respect to the spacer plate 10a.
  • the arches 20a and 20b on the one hand and 20c and 20d on the other hand can be assembled and put in place, during the mounting of the steam generator tubes, by connection of modular segments in the form of semicircular arcs comprising assembly means at their end part.
  • the assembled arches can be fixed on the spacer plate 10a and tensioned by fixing devices 19 connected to the end parts of the corresponding tie rods 14.
  • the hoops for fixing the anti-vibration bars of the steam generator according to the invention are of course left in place in the bun after mounting the steam generator, so that these hoops also ensure the maintenance of the anti-vibration bars and the stiffening of the bun of the steam generator during operation of this generator.
  • the metal hoop according to the invention holds in place the elements added in the bun of the steam generator (anti-vibration bars) and thus ensures the anti-flight function.
  • the devices for fixing the arches on the upper spacer plate in the extension of the tie rods may be different from the tensioners 19 which have been described above.
  • the invention applies not only to steam generators of nuclear pressurized water reactors but also to other steam generators or heat exchangers comprising a bundle of curved tubes arranged in planar layers parallel to each other.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The heat exchanger comprises at least one metal arch (20) having a shape similar to the shape of the arched parts (5b) of the tubes of the bundle, fixed at each of its ends on the bracing plate (10a) situated closest to the arched parts (5b) of the tubes, in the continuation of two stay rods (14), inserted between two successive tubes of a plane sheet of tubes (18) and comprising means (22) for fixing the assembly of anti-vibration bars (13) inserted between two adjacent sheets of tubes. <IMAGE>

Description

L'invention concerne un échangeur de chaleur et notamment un générateur de vapeur d'un réacteur nucléaire à eau sous pression comportant des moyens de maintien de barres antivibratoires intercalés entre les tubes du faisceau de l'échangeur.The invention relates to a heat exchanger and in particular a steam generator of a pressurized water nuclear reactor comprising means for holding antivibration bars interposed between the tubes of the heat exchanger bundle.

Les générateurs de vapeur des réacteurs nucléaires à eau sous pression comportent des tubes cintrés en U présentant deux parties rectilignes ou branches droites serties à leurs extrémités dans une plaque tubulaire. Les branches droites des tubes du faisceau sont maintenues par des entretoises disposées parallèlement les unes aux autres, réparties suivant la longueur des branches droites et comportant chacune un réseau d'ouvertures traversantes pour assurer le passage des tubes.The steam generators of pressurized water nuclear reactors comprise U-shaped bent tubes having two rectilinear parts or straight branches crimped at their ends in a tubular plate. The straight branches of the bundle tubes are held by spacers arranged parallel to each other, distributed along the length of the straight branches and each comprising a network of through openings to ensure the passage of the tubes.

Les réseaux d'ouvertures de la plaque tubulaire et des plaques entretoises sont identiques et les ouvertures sont disposées dans ces réseaux, de manière que les tubes du faisceau constituent des nappes planes parallèles présentant un faible espacement.The networks of openings of the tube plate and of the spacer plates are identical and the openings are arranged in these networks, so that the tubes of the bundle constitute parallel flat sheets having a small spacing.

Dans chacune des nappes, les cintres de forme sensiblement semi-circulaire sont juxtaposés et présentent des rayons de courbure décroissants depuis l'extérieur vers l'intérieur du faisceau. De plus, les cintres présentant le rayon de courbure maximal de chacune des nappes ont un rayon décroissant depuis la partie centrale vers la partie périphérique du faisceau.In each of the layers, the hangers of substantially semi-circular shape are juxtaposed and have decreasing radii of curvature from the outside towards the inside of the bundle. In addition, the hangers having the maximum radius of curvature of each of the plies have a decreasing radius from the central part towards the peripheral part of the beam.

De ce fait, les parties cintrées des tubes constituent une structure de forme sensiblement hémisphérique appelée chignon à la partie supérieure du faisceau de générateur de vapeur.Therefore, the curved parts of the tubes constitute a structure of substantially hemispherical shape called a bun at the top of the steam generator bundle.

Les tubes d'une même nappe et les nappes adjacentes sont séparés par des espaces libres de faible largeur permettant le passage de l'eau d'alimentation du générateur de vapeur à l'intérieur du faisceau, en contact avec la surface extérieure d'échange des tubes.The tubes of the same layer and the adjacent layers are separated by free spaces of small width allowing the passage of the feed water of the steam generator inside the bundle, in contact with the external exchange surface. tubes.

Pendant le fonctionnement du générateur de vapeur, de l'eau sous pression à haute température circule dans les tubes du faisceau et de l'eau alimentaire est amenée au contact de la surface extérieure d'échange des tubes le long desquels elle se déplace dans la direction verticale en s'échauffant puis en se vaporisant, pour ressortir sous forme de vapeur à la partie supérieure du générateur de vapeur.During operation of the steam generator, pressurized water at high temperature circulates in the bundle tubes and drinking water is brought into contact with the external exchange surface of the tubes along which it moves in the vertical direction by heating and then vaporizing, to come out as vapor at the top of the steam generator.

La circulation des fluides au contact des tubes peut provoquer des vibrations qui sont susceptibles d'entraîner des détériorations des tubes si ceux-ci ne sont pas maintenus de manière efficace.The circulation of fluids in contact with the tubes can cause vibrations which are liable to cause damage to the tubes if the latter are not effectively maintained.

La partie droite des tubes est maintenue de manière efficace par les entretoises réalisées sous forme de plaques rigides. Les parties courbes des tubes du faisceau constituant le chignon doivent également être maintenues et on utilise généralement pour cela des barres antivibratoires qui sont intercalées entre les nappes de tubes adjacentes du faisceau et disposées suivant des directions sensiblement radiales du chignon. Ces barres entretoises peuvent être pliées ou assemblées, de manière à présenter la forme d'un V dont les deux branches sont dirigées en service suivant des directions radiales du chignon entre les nappes de tubes de chacun des couples de nappes adjacentes.The straight part of the tubes is effectively held by the spacers made in the form of rigid plates. The curved parts of the tubes of the bundle constituting the bun must also be maintained and generally used for this purpose anti-vibration bars which are interposed between the plies of adjacent tubes of the bundle and arranged in substantially radial directions of the bun. These spacer bars can be folded or assembled, so as to have the shape of a V, the two branches of which are directed in service in radial directions of the bun between the plies of tubes of each of the pairs of adjacent plies.

Le montage du faisceau du générateur de vapeur est réalisé par nappes successives, dans l'enveloppe du générateur de vapeur placée en position horizontale sur un vireur.The assembly of the steam generator harness is carried out by successive layers, in the envelope of the steam generator placed in a horizontal position on a tacker.

La plupart des opérations de montage et de soudage des éléments du générateur de vapeur sont également effectuées avec le générateur de vapeur en position horizontale.Most assembly and welding operations on the steam generator elements are also carried out with the steam generator in a horizontal position.

Pendant le montage du faisceau, les barres antivibratoires qui sont introduites entre les nappes de tubes de manière que leurs branches présentent des dispositions radiales bien définies par rapport au chignon sont susceptibles de glisser et de basculer, de sorte que leur mise en place risque d'être réalisée de manière défectueuse.During assembly of the harness, the anti-vibration bars which are introduced between the layers of tubes so that their branches have well-defined radial arrangements with respect to the bun are capable of sliding and tilting, so that their installation risks being carried out in a defective manner.

A l'issue du montage du faisceau, les extrémités des branches antivibratoires opposées à leurs extrémités situées vers la partie centrale du chignon sont généralement saillantes par rapport aux tubes constituant la couche externe du chignon et reliées entre elles par des barres courbes reposant sur la surface externe du chignon sur lesquelles sont soudées les parties d'extrémité externes des barres antivibratoires.At the end of the assembly of the bundle, the ends of the anti-vibration branches opposite their ends situated towards the central part of the bun are generally projecting with respect to the tubes constituting the outer layer of the bun and connected together by curved bars resting on the surface external of the bun on which the external end parts of the anti-vibration bars are welded.

On a également proposé d'autres modes de fixation des extrémités externes des barres antivibratoires pouvant mettre en oeuvre des éléments de fixation amovibles tels que des éléments vissés.Other methods of fixing the external ends of the anti-vibration bars have also been proposed which can implement removable fixing elements such as screw elements.

Dans la mesure où les barres courbes ou autres dispositifs de maintien des extrémités externes des barres antivibratoires sont mis en place seulement après qu'on ait réalisé le montage de l'ensemble des tubes du faisceau, le maintien des barres antivibratoires les unes par rapport aux autres n'est pas assuré pendant les phases de la fabrication ultérieures au montage du faisceau, par exemple lors du soudage du fond du générateur de vapeur constituant la boîte à eau ou lors du soudage final du générateur de vapeur, de sorte que le basculement des barres ou d'autres déplacements peuvent intervenir pendant la fabrication et entraîner des défauts de positionnement des barres antivibratoires et un fléchissement des nappes de tubes entraînant la présence de défauts de forme du chignon du générateur de vapeur.Insofar as the curved bars or other devices for holding the external ends of the anti-vibration bars are put in place only after the assembly of all the tubes of the bundle, the maintenance of the anti-vibration bars with respect to the other is not ensured during the manufacturing phases subsequent to assembly of the harness, for example when welding the bottom of the steam generator constituting the water box or during the final welding of the steam generator, so that the tilting of the bars or other displacements can occur during manufacture and cause defects in the positioning of the anti-vibration bars and a bending of the plies of tubes, causing the presence of defects in the shape of the bun of the steam generator.

En outre, pendant le fonctionnement du générateur de vapeur, les barres antivibratoires qui sont en contact avec un fluide circulant à grande vitesse peuvent être déplacées à l'intérieur du chignon, du fait qu'elles ne sont reliées entre elles que par leurs extrémités extérieures et par des dispositifs de liaison situés au-dessus de la surface du chignon.In addition, during the operation of the steam generator, the anti-vibration bars which are in contact with a fluid circulating at high speed may be moved inside the bun, because they are connected to each other only by their outer ends and by connecting devices located above the surface of the bun.

Les plaques entretoises assurant le maintien des parties droites des tubes du générateur de vapeur sont fixées à des tirants perpendiculaires aux plaques entretoises et traversant celles-ci à l'intérieur d'ouvertures se substituant à des ouvertures de passage de tubes dans les réseaux des plaques entretoises.The spacer plates ensuring the maintenance of the straight parts of the tubes of the steam generator are fixed to tie rods perpendicular to the spacer plates and passing through these inside openings which replace tube passage openings in the networks of the plates. spacers.

Chacun des tirants est fixé en particulier par des pièces d'assemblage mécaniques à l'entretoise supérieure du générateur de vapeur, c'est-à-dire à l'entretoise située le plus près de la partie cintrée des tubes du faisceau.Each of the tie rods is fixed in particular by mechanical assembly parts to the upper spacer of the steam generator, that is to say to the spacer located closest to the curved part of the bundle tubes.

Dans le prolongement des tirants, à l'intérieur du chignon, il subsiste des espaces libres disposés entre deux tubes successifs d'une même nappe, du fait de la présence des tirants à l'intérieur du faisceau, dans des positions qui pourraient être occupées par des tubes. Le faisceau du générateur de vapeur présente donc certaines discontinuités à l'intérieur du chignon, dans le prolongement des tirants.In the extension of the tie rods, inside the bun, there remain free spaces arranged between two successive tubes of the same ply, due to the presence of the tie rods inside the bundle, in positions which could be occupied by tubes. The bundle of the steam generator therefore has certain discontinuities inside the bun, in the extension of the tie rods.

On ne connaissait pas jusqu'ici de dispositif permettant d'assurer un montage du faisceau d'un générateur de vapeur en évitant des basculements ou d'autres déplacements des barres antivibratoires de maintien des parties cintrées des tubes, aussi bien pendant les opérations de fabrication en aval du montage des tubes que pendant le fonctionnement du générateur de vapeur.Until now, no device has been known which allows the assembly of the bundle of a steam generator to avoid tilting or other displacements of the anti-vibration bars for holding the curved parts of the tubes, both during the manufacturing operations. downstream of the assembly of the tubes only during the operation of the steam generator.

Le but de l'invention est donc de proposer un échangeur de chaleur comportant un faisceau de tubes d'échange de chaleur pliés en U et comprenant chacun deux parties rectilignes et une partie cintrée, une plaque tubulaire et une pluralité de plaques entretoises parallèles entre elles et espacées suivant la longueur des parties rectilignes des tubes, dans lesquelles les tubes du faisceau sont engagés à l'intérieur d'ouvertures traversantes assurant le maintien des tubes suivant des nappes planes parallèles entre elles, des tirants de maintien des plaques entretoises disposés à l'intérieur du faisceau parallèlement aux parties rectilignes des tubes et des ensembles de barres antivibratoires intercalées entre les parties cintrées de tubes disposées suivant des nappes adjacentes, cet échangeur de chaleur ayant une conception permettant d'améliorer la mise en place et le maintien des barres antivibratoires et des tubes, pendant le montage du faisceau ainsi que le maintien des barres antivibratoires d'une part pendant la fabrication et d'autre part pendant le fonctionnement de l'échangeur de chaleur.The object of the invention is therefore to propose a heat exchanger comprising a bundle of heat exchange tubes bent in a U and each comprising two rectilinear parts and a curved part, a tubular plate and a plurality of parallel spacer plates. between them and spaced along the length of the rectilinear parts of the tubes, in which the tubes of the bundle are engaged inside through openings ensuring the maintenance of the tubes according to flat sheets parallel to each other, tie rods for holding the spacer plates arranged inside the bundle parallel to the straight parts of the tubes and sets of anti-vibration bars interposed between the bent parts of the tubes arranged in adjacent layers, this heat exchanger having a design making it possible to improve the positioning and the maintenance of the anti-vibration bars and tubes, during assembly of the harness as well as maintenance of the anti-vibration bars on the one hand during manufacture and on the other hand during the operation of the heat exchanger.

Dans ce but, l'échangeur de chaleur suivant l'invention comporte de plus, pour le maintien d'au moins un ensemble de barres antivibratoires disposées entre les tubes de deux nappes adjacentes, au moins un arceau métallique présentant une forme analogue à la forme des parties cintrées des tubes du faisceau, fixé à chacune de ses extrémités à la plaque entretoise située le plus près des parties cintrées des tubes, dans le prolongement de deux tirants, intercalé entre deux tubes d'une nappe de tubes et comportant des moyens de fixation de l'ensemble des barres antivibratoires intercalées entre la nappe de tubes dans laquelle l'arceau est disposé et au moins une nappe adjacente.For this purpose, the heat exchanger according to the invention further comprises, for maintaining at least one set of anti-vibration bars arranged between the tubes of two adjacent plies, at least one metal hoop having a shape analogous to the shape curved parts of the bundle tubes, fixed at each of its ends to the spacer plate located closest to the curved parts of the tubes, in the extension of two tie rods, interposed between two tubes of a sheet of tubes and comprising means for fixing of all the antivibration bars inserted between the ply of tubes in which the arch is arranged and at least one adjacent ply.

Afin de bien faire comprendre l'invention, on va maintenant décrire, à titre d'exemple non limitatif, en se référant aux figures jointes en annexe, un générateur de vapeur d'un réacteur nucléaire à eau sous pression selon l'invention.In order to clearly understand the invention, a description will now be given, by way of nonlimiting example, with reference to the appended figures, a steam generator of a pressurized water nuclear reactor according to the invention.

La figure 1 est une vue en perspective éclatée et en coupe partielle d'un générateur de vapeur de réacteur nucléaire à eau sous pression suivant l'invention.Figure 1 is an exploded perspective view in partial section of a pressurized water nuclear reactor steam generator according to the invention.

La figure 2 est une vue en coupe de la partie supérieure du faisceau du générateur de vapeur représenté sur la figure 1.FIG. 2 is a sectional view of the upper part of the bundle of the steam generator shown in FIG. 1.

La figure 3 est une vue de dessus suivant 3 de la figure 2.FIG. 3 is a top view along 3 in FIG. 2.

La figure 4 est une vue de dessus à grande échelle suivant 4-4 de la figure 2.FIG. 4 is a top view on a large scale along 4-4 of FIG. 2.

La figure 5 est une vue à plus grande échelle en coupe par un plan vertical du détail 5 de la figure 2.FIG. 5 is an enlarged view in section through a vertical plane of detail 5 of FIG. 2.

Sur la figure 1, on voit un générateur de vapeur d'un réacteur nucléaire à eau sous pression désigné de manière générale par le repère 1 et comportant une enveloppe externe 2 reliée à sa partie inférieure à une plaque tubulaire 3 de forte épaisseur.In Figure 1, we see a steam generator of a pressurized water nuclear reactor generally designated by the reference 1 and having an outer casing 2 connected at its lower part to a tubular plate 3 of great thickness.

L'enveloppe 2 renferme le faisceau de tubes du générateur de vapeur constitué par des tubes 5 cintrés en U et comportant à leur partie supérieure, des cintres 5b semi-circulaires et deux parties rectilignes 5a.The casing 2 contains the bundle of tubes of the steam generator constituted by tubes 5 bent in a U shape and comprising at their upper part, semi-circular hangers 5b and two straight parts 5a.

Les parties rectilignes 5a des tubes du faisceau sont serties à leurs extrémités dans la plaque tubulaire 3, de manière à déboucher dans une boîte à eau 7 en deux parties séparées par une cloison 8.The straight parts 5a of the bundle tubes are crimped at their ends into the tube plate 3, so as to open into a water box 7 in two parts separated by a partition 8.

L'eau sous pression du réacteur nucléaire pénétre dans une des parties de la boîte à eau 7 par une tubulure d'entrée 6a, circule dans les tubes du faisceau puis ressort par une tubulure de sortie 6b.The pressurized water from the nuclear reactor enters one of the parts of the water box 7 via an inlet pipe 6a, flows through the tubes of the bundle and then leaves through an outlet pipe 6b.

Le faisceau de tubes 5 est entouré par une enveloppe de faisceau 9 permettant de canaliser l'eau d'alimentation pénétrant dans l'enveloppe du générateur de vapeur par une tubulure d'arrivée 11. L'eau d'alimentation du générateur de vapeur circule d'abord de haut en bas dans l'espace annulaire situé autour de l'enveloppe de faisceau 9 puis de bas en haut au contact des tubes 5 du faisceau, de manière à s'échauffer puis à se vaporiser et à ressortir sous forme de vapeur par la tubulure supérieure 12 du générateur de vapeur.The bundle of tubes 5 is surrounded by a bundle casing 9 making it possible to channel the feed water entering the casing of the steam generator by an inlet pipe 11. The feed water of the steam generator circulates first from top to bottom in the annular space around the envelope of bundle 9 then from bottom to top in contact with the tubes 5 of the bundle, so as to heat up then to vaporize and to emerge in the form of vapor by the upper tube 12 of the steam generator.

La partie supérieure du faisceau de tubes 5 est constituée par la juxtaposition de cintres de forme semi-circulaire dont les rayons sont décroissants de l'extérieur vers l'intérieur d'une nappe plane telle que représentée sur la figure 1.The upper part of the bundle of tubes 5 is constituted by the juxtaposition of hangers of semi-circular shape whose radii are decreasing from the outside towards the inside of a flat sheet as shown in FIG. 1.

De plus, les différentes nappes successives de tubes du faisceau parallèles entre elles comportent des cintres extérieurs de diamètres décroissants si bien que la partie supérieure du faisceau constitue un ensemble de forme sensiblement hémisphérique appelé chignon.In addition, the different successive layers of tubes of the bundle parallel to each other comprise external hangers of decreasing diameters so that the upper part of the bundle constitutes a substantially hemispherical assembly called a bun.

Les parties rectilignes 5a des tubes 5 sont maintenues par des plaques entretoises 10 qui empêchent la mise en vibration des tubes lorsque le générateur de vapeur est en service sous l'effet de la circulation des fluides d'échange. La plaque entretoise 10a située le plus haut dans le générateur de vapeur, juste en-dessous des cintres 5b, est appelée plaque entretoise supérieure du générateur de vapeur.The straight parts 5a of the tubes 5 are held by spacer plates 10 which prevent the tubes from vibrating when the steam generator is in operation under the effect of the circulation of exchange fluids. The spacer plate 10a located highest in the steam generator, just below the hangers 5b, is called the upper spacer plate of the steam generator.

La plaque tubulaire 3 et les plaques entretoises 10 sont percées suivant un réseau d'ouvertures traversantes permettant le passage des branches rectilignes 5a des tubes 5, pour leur fixation ou leur maintien dans une disposition telle que les branches 5a des tubes sont toutes parallèles entre elles et disposées dans la direction axiale du faisceau qui est la direction verticale lorsque le générateur de vapeur 1 est en service dans le réacteur nucléaire.The tubular plate 3 and the spacer plates 10 are pierced in a network of through openings allowing the passage of the straight branches 5a of the tubes 5, for their fixing or their maintenance in an arrangement such that the branches 5a of the tubes are all mutually parallel and arranged in the axial direction of the beam which is the vertical direction when the steam generator 1 is in service in the nuclear reactor.

De plus, les tubes 5 sont disposés suivant des nappes planes parallèles entre elles, du fait que la plaque tubulaire 3 et les plaques entretoises 10 sont percées d'ouvertures alignées suivant des rangées rectilignes successives. Les deux branches de chacun des tubes sont engagées dans deux ouvertures alignées d'une même rangée situées de part et d'autre de la partie centrale des plaques entretoises et de la plaque tubulaire. Le réseau d'ouvertures de la plaque tubulaire et des plaques entretoises constitue également des rangées rectilignes dans une direction perpendiculaire aux nappes parallèles de tubes de sorte que les tubes cintrés sont également alignés dans une direction perpendiculaire au plan de coupe de la figure 1.In addition, the tubes 5 are arranged in planar plies parallel to each other, because the tubular plate 3 and the spacer plates 10 are pierced with openings aligned in straight rows successive. The two branches of each of the tubes are engaged in two aligned openings in the same row located on either side of the central part of the spacer plates and of the tube plate. The network of openings of the tubular plate and of the spacer plates also constitutes rectilinear rows in a direction perpendicular to the parallel plies of tubes so that the bent tubes are also aligned in a direction perpendicular to the section plane of FIG. 1.

Les tubes cintrés de plus faible rayon de courbure situé à la partie centrale du faisceau définissent une allée centrale libre à l'intérieur du faisceau de part et d'autre de laquelle les parties rectilignes des tubes sont disposées de manière symétrique.The bent tubes with a smaller radius of curvature located at the central part of the bundle define a free central aisle inside the bundle on either side of which the rectilinear parts of the tubes are arranged symmetrically.

Les parties cintrées des tubes situés à l'extrémité supérieure du faisceau sont maintenues par des barres antivibratoires 13 comportant chacune deux branches reliées entre elles à la partie centrale 13a de la barre antivibratoire située à l'intérieur du faisceau. Les deux branches de chacune des barres antivibratoires peuvent être reliées entre elles de manière articulée et constituer ainsi une pièce en forme de compas ou être réalisées sous la forme d'une barre pliée dont la partie centrale 13a constitue la partie pliée.The curved parts of the tubes located at the upper end of the bundle are held by anti-vibration bars 13 each comprising two branches connected to each other at the central part 13a of the anti-vibration bar located inside the beam. The two branches of each of the antivibration bars can be connected to each other in an articulated manner and thus constitute a piece in the form of a compass or be produced in the form of a folded bar, the central part 13a constituting the folded part.

Les extrémités des branches des barres antivibratoires 13 opposées à la partie centrale 13a qui sont légèrement saillantes par rapport à la couche externe de tubes du chignon sont soudées sur des pièces annulaires de maintien 16 situées au-dessus de la surface du chignon.The ends of the arms of the anti-vibration bars 13 opposite the central part 13a which are slightly projecting with respect to the outer layer of bun tubes are welded to annular retaining pieces 16 situated above the surface of the bun.

Les plaques entretoises 10 sont maintenues à l'intérieur du faisceau 4 dans des dispositions parallèles et espacées les unes des autres suivant la longueur des branches droites 5a des tubes du faisceau, par des tirants 14 disposés à l'intérieur du faisceau 4 dans des dispositions parallèles aux branches droites 5a des tubes 5.The spacer plates 10 are held inside the bundle 4 in parallel arrangements and spaced from one another along the length of the straight branches 5a of the bundle tubes, by tie rods 14 arranged inside the bundle 4 in arrangements parallel to the straight branches 5a of the tubes 5.

Les tirants 14 sont fixés dans la plaque tubulaire 3 et traversent chacune des plaques entretoises 10 à l'intérieur d'une ouverture du réseau d'ouvertures de traversée des tubes 5.The tie rods 14 are fixed in the tubular plate 3 and pass through each of the spacer plates 10 inside an opening of the network of openings for crossing the tubes 5.

Les tirants 14 sont fixés sur chacune des plaques entretoises 10 qu'ils traversent, au niveau de l'ouverture correspondante de traversée, par exemple par des dispositifs mécaniques et/ou par des soudures.The tie rods 14 are fixed to each of the spacer plates 10 which they pass through, at the level of the corresponding crossing opening, for example by mechanical devices and / or by welds.

Les tirants 14 rectilignes sont fixés à leur partie supérieure sur la plaque entretoise supérieure 10a, par l'intermédiaire de dispositifs mécaniques tels que des écrous et des rondelles de blocage fixés sur une partie d'extrémité filetée du tirant 14 saillante au-dessus de la plaque entretoise supérieure 10a. La fixation par écrous des tirants 14 est complétée par des soudures, de manière à assurer le blocage et l'imperdabilité des pièces de fixation.The straight tie rods 14 are fixed at their upper part to the upper spacer plate 10a, by means of mechanical devices such as nuts and locking washers fixed to a threaded end part of the tie rod protruding above the upper spacer plate 10a. The fastening by nuts of the tie rods 14 is completed by welds, so as to ensure the blocking and the captivity of the fixing parts.

Sur les figures 1 et 2, on a représenté quelques tubes 5 d'une nappe plane 18 située au voisinage de la partie centrale du faisceau du générateur de vapeur et un ensemble de quatre barres antivibratoires 13 en forme de V comportant chacune deux branches rectilignes disposées dans des directions sensiblement radiales à l'intérieur du chignon du faisceau 4, en contact avec les tubes 5 de la nappe plane 18.In FIGS. 1 and 2, there are shown a few tubes 5 of a flat sheet 18 located in the vicinity of the central part of the bundle of the steam generator and a set of four V-shaped anti-vibration bars 13 each having two rectilinear branches arranged in substantially radial directions inside the bun of the bundle 4, in contact with the tubes 5 of the flat sheet 18.

Les quatre barres antivibratoires 13 dont les branches font entre elles des angles variables constituent un ensemble ou jeu de barres antivibratoires intercalé entre deux nappes adjacentes 18 de tubes 5 du faisceau. Les barres antivibratoires 13 sont engagées plus ou moins profondément à l'intérieur du chignon du faisceau 4, de manière que les branches successives des différentes barres antivibratoires fassent entre elles des angles sensiblement constants.The four anti-vibration bars 13 whose branches form variable angles between them constitute a set or set of anti-vibration bars interposed between two adjacent plies 18 of tubes 5 of the bundle. The anti-vibration bars 13 are engaged more or less deeply inside the bun of the bundle 4, so that the successive branches of the different anti-vibration bars make substantially constant angles between them.

Dans le mode de réalisation représenté, l'ensemble de barres antivibratoires comporte quatre barres et huit branches.In the embodiment shown, the set of anti-vibration bars has four bars and eight branches.

Lors du montage du faisceau du générateur de vapeur, par engagement des tubes 5 à l'intérieur des ouvertures des plaques entretoises 10 et de la plaque tubulaire 3, on constitue successivement les nappes planes 18 par juxtaposition des tubes 5, l'enveloppe 2 du générateur de vapeur étant placée avec son axe de symétrie 2' dans une direction horizontale.When mounting the bundle of the steam generator, by engagement of the tubes 5 inside the openings of the spacer plates 10 and of the tube plate 3, the flat layers 18 are successively formed by juxtaposition of the tubes 5, the casing 2 of the steam generator being placed with its axis of symmetry 2 'in a horizontal direction.

Les barres antivibratoires 13 d'un ensemble de barres destinées à venir en contact avec une nappe plane 18 de tubes sont mises en place sur la nappe 18 qui vient d'être constituée. En outre, du fait qu'elles ne sont pas fixées entre elles par les anneaux de fixation 16, les barres antivibratoires 13 qui ne sont pas maintenues risquent de basculer autour de leur partie interne 13a, entre les deux nappes de tubes 18 avec lesquelles elles sont en contact, lorsqu'on fait tourner le générateur de vapeur autour de son axe 2' sur les rouleaux du vireur, de manière à réaliser diverses opérations de montage ou de soudage.The anti-vibration bars 13 of a set of bars intended to come into contact with a flat sheet 18 of tubes are placed on the sheet 18 which has just been formed. In addition, due to the fact that they are not fixed to each other by the fixing rings 16, the anti-vibration bars 13 which are not held are liable to tilt around their internal part 13a, between the two plies of tubes 18 with which they are in contact when the steam generator is rotated about its axis 2 'on the rollers of the tacker, so as to carry out various mounting or welding operations.

Selon l'invention, les ensembles de barres antivibratoires 13 intercalées entre certaines nappes de tubes 18 peuvent être immobilisés dans une position de montage précise, en utilisant un arceau métallique 20 présentant une forme analogue à la forme des parties cintrées 5b des tubes 5, c'est-à-dire une forme sensiblement semi-circulaire.According to the invention, the sets of anti-vibration bars 13 interposed between certain plies of tubes 18 can be immobilized in a precise mounting position, using a metal hoop 20 having a shape analogous to the shape of the bent parts 5b of the tubes 5, c that is to say a substantially semi-circular shape.

L'arceau 20 est fixé par des dispositifs 19 qui seront décrits plus en détail dans la suite de la description, sur la plaque entretoise supérieure 10a du générateur de vapeur, dans le prolongement de deux tirants 14 de maintien des plaques-entretoises 10.The arch 20 is fixed by devices 19 which will be described in more detail in the following description, on the upper spacer plate 10a of the generator. steam, in the extension of two tie rods 14 for holding the spacer plates 10.

La nappe de tubes 18 représentée sur les figures 1 et 2 comporte des tubes 5 engagés dans des ouvertures alignées des plaques entretoises 10 et de la plaque tubulaire 3, deux de ces ouvertures étant réservées pour le passage et la fixation de deux tirants de maintien 14.The sheet of tubes 18 represented in FIGS. 1 and 2 comprises tubes 5 engaged in aligned openings of the spacer plates 10 and of the tube plate 3, two of these openings being reserved for the passage and the fixing of two retaining rods 14 .

Dans le chignon du faisceau 4, il subsiste entre deux tubes voisins de la nappe 18, dans le prolongement des tirants 14, un espace permettant d'intercaler l'arceau de fixation 20 des barres antivibratoires 13.In the bun of the bundle 4, there remains between two neighboring tubes of the ply 18, in the extension of the tie rods 14, a space allowing the fixing hoop 20 of the anti-vibration bars 13 to be inserted.

L'arceau 20 est constitué de segments successifs 21 en forme d'arc-de-cercle. Les segments 21'a et 21'b situés aux extrémités de l'arceau 20 sont fixés au-dessus de la face supérieure de la plaque entretoise supérieure 10a, par l'intermédiaire des dispositifs de fixation 19.The arch 20 is made up of successive segments 21 in the shape of a semicircle. The segments 21'a and 21'b situated at the ends of the arch 20 are fixed above the upper face of the upper spacer plate 10a, by means of the fixing devices 19.

Les segments successifs 21 de l'arceau 20, entre les segments 21'a et 21'b, sont reliés entre eux bout à bout et aux barres antivibratoires 13, par des dispositifs de liaison 22 qui seront décrits plus en détail en se référant à la figure 4.The successive segments 21 of the arch 20, between the segments 21'a and 21'b, are connected to each other end to end and to the anti-vibration bars 13, by connecting devices 22 which will be described in more detail with reference to Figure 4.

Sur la figure 4, on a représenté deux segments successifs 21a et 21b de l'arceau 20 au niveau d'une zone de liaison 22 des segments 21 entre eux et avec deux branches de barres antivibratoires 13 insérées entre des tubes 5 de nappes adjacentes du faisceau du générateur de vapeur.FIG. 4 shows two successive segments 21a and 21b of the arch 20 at a connection zone 22 of the segments 21 between them and with two branches of anti-vibration bars 13 inserted between tubes 5 of adjacent layers of the steam generator harness.

Les segments 21a et 21b sont découpés en forme d'arc-de-cercle et comportent chacun à leurs extrémités situées en vis-à-vis au niveau de la zone de liaison 22, une chape de liaison. Les chapes 22a, 22b de chacun des segments 21a et 21b sont placées en vis-à-vis l'une de l'autre et en vis-à-vis d'une partie d'extrémité du segment sur lequel elles doivent être assemblées.The segments 21a and 21b are cut in the shape of a semicircle and each have at their ends located opposite at the level of the connection zone 22, a connection yoke. The yokes 22a, 22b of each of the segments 21a and 21b are placed opposite one another and opposite an end portion of the segment on which they are to be assembled.

Les parties d'extrémité des segments 21a et 21b et des chapes 22a, 22b sont traversées par des ouvertures ayant une partie filetée.The end parts of the segments 21a and 21b and the yokes 22a, 22b are crossed by openings having a threaded part.

Les chapes 22a et 22b sont décalées latéralement par rapport au plan médian des segments correspondants 21a et 21b, de manière que dans la position d'assemblage des segments 21a et 21b, il subsiste un espace entre la chape 22a du segment 21a et le segment 21b et entre la chape 22b du segment 21b et le segment 21a permettant l'introduction et la fixation d'une branche d'une barre antivibratoire 13.The yokes 22a and 22b are offset laterally relative to the median plane of the corresponding segments 21a and 21b, so that in the assembly position of the segments 21a and 21b, there remains a space between the yoke 22a of the segment 21a and the segment 21b and between the yoke 22b of the segment 21b and the segment 21a allowing the introduction and the fixing of a branch of an anti-vibration bar 13.

Du fait que l'arceau 20 est disposé à l'intérieur d'une nappe de tubes 18, entre deux tubes séparés par un espace dû à la présence d'un tirant, les chapes 22a et 22b et les segments d'arceau 21a et 21b sont susceptibles d'assurer la fixation de deux branches de barres antivibratoires 13 intercalées dans deux espaces entre la nappe 18 et une nappe adjacente, d'un côté et de l'autre de la nappe 18.Due to the fact that the arch 20 is placed inside a ply of tubes 18, between two tubes separated by a space due to the presence of a tie rod, the yokes 22a and 22b and the hoop segments 21a and 21b are capable of securing two branches of anti-vibration bars 13 interposed in two spaces between the ply 18 and an adjacent ply, on one side and the other of the ply 18.

Les segments successifs tels que 21a et 21b de l'arceau 20 sont assemblés entre eux par des vis telles que 23a et 23b. Les deux branches de barres antivibratoires 13 disposées de part et d'autre de la nappe de tubes 18 sont serrées et maintenues fermement entre les chapes et les parties d'extrémité des segments.The successive segments such as 21a and 21b of the arch 20 are joined together by screws such as 23a and 23b. The two branches of anti-vibration bars 13 arranged on either side of the ply of tubes 18 are clamped and held firmly between the yokes and the end parts of the segments.

Comme il est visible sur la figure 5, le dispositif de fixation 19 d'un segment d'extrémité tel que 21'a de l'arceau 20 comporte un premier élément 24 traversé par deux ouvertures taraudées successives 24a, 24b ayant le même axe, une tige filetée 25 solidaire d'un écrou 26 et un second élément constitué par la partie d'extrémité du segment 21'a dans laquelle est usiné un trou taraudé.As can be seen in FIG. 5, the device 19 for fixing an end segment such as 21 ′ a of the arch 20 comprises a first element 24 crossed by two successive tapped openings 24 a, 24 b having the same axis, a threaded rod 25 secured to a nut 26 and a second element constituted by the end part of the segment 21'a in which a threaded hole is machined.

Le dispositif 19 comportant le premier élément 24, le second élément 21'a et la tige 25 constitue un tendeur permettant d'exercer une traction sur une extrémité de l'arceau 20 et d'assurer la fixation de cet arceau sur la plaque entretoise supérieure 10a.The device 19 comprising the first element 24, the second element 21'a and the rod 25 constitutes a tensioner making it possible to exert traction on one end of the arch 20 and of securing this arch on the upper spacer plate 10a.

Le premier élément 24 comporte suivant son axe, une première ouverture taraudée 24a et une seconde ouverture taraudée 24b d'un diamètre inférieur au diamètre de l'ouverture taraudée 24a séparées par une ouverture intermédiaire lisse 24c ayant un diamètre intermédiaire entre le diamètre des ouvertures 24a et 24b et par une gorge 24d.The first element 24 has, along its axis, a first tapped opening 24a and a second tapped opening 24b with a diameter less than the diameter of the tapped opening 24a separated by a smooth intermediate opening 24c having an intermediate diameter between the diameter of the openings 24a and 24b and by a groove 24d.

Le tirant 14 dans le prolongement duquel on vient placer une extrémité de l'anneau 20 comporte une partie filetée d'extrémité 14a venant en saillie au-dessus de la plaque entretoise supérieure 10a. L'ouverture taraudée 24a de l'élément 24 présente un diamètre et un pas permettant de réaliser la fixation par vissage de l'élément 24 sur la partie d'extrémité 14a du tirant 14. Préalablement à la fixation par vissage de l'élément 24 sur l'extrémité 14a du tirant 14, on place à l'intérieur de l'ouverture intermédiaire 24c, une pièce de blocage et de butée 28 sur laquelle la partie 14a du tirant vient en butée lors du vissage de l'élément 24.The tie rod 14, in the extension of which one end of the ring 20 is placed, comprises a threaded end part 14a projecting above the upper spacer plate 10a. The threaded opening 24a of the element 24 has a diameter and a pitch allowing the fixing by screwing of the element 24 on the end portion 14a of the tie rod 14. Prior to the fixing by screwing of the element 24 on the end 14a of the tie rod 14, a blocking and abutment piece 28 is placed inside the intermediate opening 24c on which the part 14a of the tie rod abuts when the element 24 is screwed.

La tige 25 comporte deux parties filetées 25a et 25b ayant des pas inverses, de part et d'autre de l'écrou 26.The rod 25 comprises two threaded parts 25a and 25b having reverse pitches, on either side of the nut 26.

Le segment d'extrémité 21'a de l'arceau 20 comporte une ouverture taraudée dont le diamètre et le pas permettent le vissage de la partie 25a de la tige 25.The end segment 21'a of the hoop 20 has a threaded opening whose diameter and pitch allow the screwing of the part 25a of the rod 25.

L'ouverture taraudée 24b présente un diamètre et un pas permettant le vissage de la partie 25b de la tige 25.The threaded opening 24b has a diameter and a pitch allowing the screwing of the part 25b of the rod 25.

Après fixation par vissage et serrage de la pièce 24, par l'intermédiaire de son ouverture taraudée 24a sur la partie d'extrémité 14a du tirant 14, la tige 25 est vissée dans l'ouverture taraudée 24b de l'élément 24 par sa partie 25b et dans l'ouverture taraudée du segment d'extrémité 21'a de l'arceau, par sa partie 25a.After fixing by screwing and tightening the part 24, by means of its tapped opening 24a on the end part 14a of the tie rod 14, the rod 25 is screwed into the tapped opening 24b of the element 24 by its part 25b and in the tapped opening of the end segment 21'a of the arch, by its part 25a.

La mise en tension et la fixation de l'arceau 20 sont réalisées par l'intermédiaire de l'écrou 26 du dispositif 19 qui constitue un tendeur.The tensioning and fixing of the arch 20 are carried out by means of the nut 26 of the device 19 which constitutes a tensioner.

La mise en place de l'anneau 20 peut donc être réalisée pendant le montage du faisceau, en assemblant les segments successifs 21 de l'anneau entre eux et aux barres antivibratoires disposées de part et d'autre de la nappe de tubes en cours de montage ; les dispositifs de fixation 19 à chacune des extrémités de l'arceau 20 sont mis en place et serrés de manière à assurer la tension de l'arceau 20 et la fixation en place des deux ensembles de barres antivibratoires 13 disposés de part et d'autre de la nappe de tubes 18.The establishment of the ring 20 can therefore be carried out during the assembly of the bundle, by assembling the successive segments 21 of the ring between them and to the anti-vibration bars placed on either side of the ply of tubes being mounting; the fastening devices 19 at each end of the hoop 20 are put in place and tightened so as to ensure the tension of the hoop 20 and the fixing in place of the two sets of anti-vibration bars 13 arranged on either side of the sheet of tubes 18.

On peut réaliser le blocage de la tige 25 par rapport à la pièce 24 par une soudure 27, à l'issue du serrage et de la mise en tension de l'anneau.The rod 25 can be locked relative to the part 24 by a weld 27, after tightening and tensioning of the ring.

Sur la figure 3, on a représenté dans une vue de dessus, quatre arceaux 20a, 20b, 20c et 20d d'un générateur de vapeur réalisé suivant l'invention, les arceaux 20a et 20b d'une part et 20c et 20d d'autre part étant symétriques l'un de l'autre par rapport à l'allée centrale du générateur de vapeur dont l'axe 28 a été représenté sur la figure 3.In Figure 3, there is shown in a top view, four arches 20a, 20b, 20c and 20d of a steam generator produced according to the invention, the arches 20a and 20b on the one hand and 20c and 20d of on the other hand being symmetrical to each other with respect to the central aisle of the steam generator whose axis 28 has been shown in FIG. 3.

De manière à montrer les arceaux 20a à 20d disposés à l'intérieur du chignon du faiseau du générateur de vapeur, on n'a représenté que deux nappes de tubes 18a et 18b situées de part et d'autre d'une nappe 18c dans laquelle est intercalé l'arceau 20a.So as to show the arches 20a to 20d arranged inside the bun of the bundle of the steam generator, only two plies of tubes 18a and 18b have been shown located on either side of a ply 18c in which is interposed the arch 20a.

La plaque entretoise supérieure 10a du générateur de vapeur est percée d'ouvertures disposées suivant un réseau permettant le passage des tubes du faisceau et des tirants de fixation des plaques entretoises.The upper spacer plate 10a of the steam generator is pierced with openings arranged in a network allowing the passage of the tubes of the bundle and the tie rods for fixing the spacer plates.

Sur la figure 3, on a représenté uniquement les parties d'extrémité des tirants 14 fixés sur la plaque entretoise 10a. Les arceaux 20a, 20b, 20c et 20d sont fixés par leurs extrémités sur la plaque entretoise 10a, chacun dans le prolongement de deux tirants 14.In Figure 3, there is shown only the end portions of the tie rods 14 fixed on the spacer plate 10a. The arches 20a, 20b, 20c and 20d are fixed by their ends to the spacer plate 10a, each in the extension of two tie rods 14.

Les tirants 14 dans le prolongement desquels sont fixés les arceaux sont tous disposés sur un cercle 29 concentrique par rapport à la plaque entretoise 10a.The tie rods 14 in the extension of which the arches are fixed are all arranged on a circle 29 concentric with respect to the spacer plate 10a.

Dans le cas du générateur de vapeur représenté sur la figure 3, huit ensembles de barres antivibratoires disposés entre des nappes 18 du faisceau sont maintenus en place par les deux grands arceaux 20a et 20b disposés au voisinage de l'allée centrale 28 et par les deux petits arceaux 20c et 20d placés dans des positions plus éloignées de l'allée centrale 28.In the case of the steam generator shown in FIG. 3, eight sets of anti-vibration bars arranged between layers 18 of the bundle are held in place by the two large arches 20a and 20b arranged in the vicinity of the central aisle 28 and by the two small hoops 20c and 20d placed in positions further from the central aisle 28.

Les arceaux 20a et 20b d'une part et 20c et 20d d'autre part peuvent être assemblés et mis en place, lors du montage des tubes du générateur de vapeur, par raccordement de segments modulaires en forme d'arcs-de-cercle comportant des moyens d'assemblage à leur partie d'extrémité. Les arceaux assemblés peuvent être fixés sur la plaque entretoise 10a et mis en tension par des dispositifs de fixation 19 reliés aux parties d'extrémité des tirants 14 correspondants.The arches 20a and 20b on the one hand and 20c and 20d on the other hand can be assembled and put in place, during the mounting of the steam generator tubes, by connection of modular segments in the form of semicircular arcs comprising assembly means at their end part. The assembled arches can be fixed on the spacer plate 10a and tensioned by fixing devices 19 connected to the end parts of the corresponding tie rods 14.

On réalise ainsi, pendant le montage du faisceau du générateur de vapeur, la mise en place précise et la fixation d'un grand nombre de barres antivibratoires, ce qui permet d'assurer une plus grande rigidité des nappes planes de tubes successives et de l'ensemble du chignon.In this way, during the assembly of the steam generator harness, precise positioning and fixing of a large number of anti-vibration bars, which ensures greater rigidity of the flat layers of successive tubes and of the whole bun.

Lors des opérations en atelier nécessaires pour la fabrication du générateur de vapeur s'accompagnant de déplacements du faisceau en rotation autour de son axe placé dans une disposition horizontale, les barres antivibratoires sont maintenues efficacement si bien qu'elles ne sont plus susceptibles de basculer entre les nappes de tubes.During the workshop operations necessary for the manufacture of the steam generator accompanied by movements of the rotating beam around its axis placed in a horizontal arrangement, the anti-vibration bars are effectively maintained so that they do not are more likely to switch between the plies of tubes.

Ces barres antivibratoires sont également maintenues de telle sorte qu'elles ne peuvent plus se déplacer par glissement et s'enfoncer à l'intérieur du chignon.These anti-vibration bars are also held so that they can no longer move by sliding and sink into the inside of the bun.

De manière générale, pendant le montage du faisceau et du générateur de vapeur, on assure plus facilement une meilleure mise en place et un maintien efficace des barres antivibratoires introduites dans le chignon du générateur de vapeur.In general, during assembly of the harness and the steam generator, it is more easily ensured that the anti-vibration bars introduced into the bun of the steam generator are better positioned and effectively maintained.

Les arceaux de fixation des barres antivibratoires du générateur de vapeur suivant l'invention sont bien entendu laissés en place dans le chignon après le montage du générateur de vapeur, de sorte que ces arceaux assurent également le maintien des barres antivibratoires et le raidissement du chignon du générateur de vapeur pendant le fonctionnement de ce générateur.The hoops for fixing the anti-vibration bars of the steam generator according to the invention are of course left in place in the bun after mounting the steam generator, so that these hoops also ensure the maintenance of the anti-vibration bars and the stiffening of the bun of the steam generator during operation of this generator.

En cas de rupture de la tubulure de vapeur du générateur, l'arceau métallique selon l'invention maintient en place les éléments rapportés dans le chignon du générateur de vapeur (barres antivibratoires) et assure ainsi la fonction anti-envol.In case of rupture of the steam pipe of the generator, the metal hoop according to the invention holds in place the elements added in the bun of the steam generator (anti-vibration bars) and thus ensures the anti-flight function.

L'obtention et le maintien des caractéristiques géométriques du faisceau du générateur de vapeur sont donc assurés de manière très efficace dans les générateurs de vapeur suivant l'invention.Obtaining and maintaining the geometrical characteristics of the bundle of the steam generator are therefore very effectively ensured in the steam generators according to the invention.

L'invention ne se limite pas au mode de réalisation qui a été décrit.The invention is not limited to the embodiment which has been described.

C'est ainsi qu'on peut imaginer des arceaux réalisés sous une forme différente de celle qui a été décrite, cette forme de réalisation modulaire présentant l'avantage de réaliser simultanément l'assemblage et l'adaptation des arceaux et la fixation des barres antivibratoires.This is how we can imagine hoops produced in a form different from that which has been described, this modular embodiment having the advantage of simultaneously assembling and adapting the hoops and fixing the anti-vibration bars. .

De même, les dispositifs de fixation des arceaux sur la plaque entretoise supérieure dans le prolongement des tirants peuvent être différents des tendeurs 19 qui ont été décrits plus haut.Similarly, the devices for fixing the arches on the upper spacer plate in the extension of the tie rods may be different from the tensioners 19 which have been described above.

Il est bien évident qu'on peut placer un nombre quelconque d'arceaux de fixation des barres antivibratoires et de raidissement à l'intérieur du chignon du faisceau du générateur de vapeur, ce nombre dépendant du nombre et de la position des tirants de maintien des plaques entretoises se substituant à certains tubes du faisceau.It is quite obvious that any number of arches for fixing the anti-vibration and stiffening bars can be placed inside the bun of the bundle of the steam generator, this number depending on the number and the position of the tie rods for holding the spacer plates replacing some of the bundle tubes.

On peut même envisager, dans des cas très particuliers, de n'utiliser qu'un seul arceau de fixation et de raidissement. Généralement, du fait de la symétrie du faisceau des générateurs de vapeur, on utilisera un nombre pair d'arceaux de fixation et de raidissement disposés deux à deux de manière symétrique par rapport au plan de symétrie du faisceau.We can even consider, in very specific cases, to use only one hoop for fixing and stiffening. Generally, due to the symmetry of the bundle of steam generators, an even number of fixing and stiffening hoops will be used, arranged in pairs symmetrically with respect to the plane of symmetry of the bundle.

L'invention s'applique non seulement aux générateurs de vapeur des réacteurs nucléaires à eau sous pression mais également à d'autres générateurs de vapeur ou échangeurs de chaleur comportant un faisceau de tubes cintrés disposés suivant des nappes planes parallèles entre elles.The invention applies not only to steam generators of nuclear pressurized water reactors but also to other steam generators or heat exchangers comprising a bundle of curved tubes arranged in planar layers parallel to each other.

Claims (9)

1.- Echangeur de chaleur comportant un faisceau de tubes (5) d'échange de chaleur pliés en U et comprenant chacun deux parties rectilignes (5a) et une partie cintrée (5b), une plaque tubulaire (3) et une pluralité de plaques entretoises (10) parallèles entre elles et espacées suivant la direction longitudinale des parties rectilignes (5a) des tubes (5), dans lesquelles les tubes (5) du faisceau sont engagés à l'intérieur d'ouvertures traversantes assurant le maintien des tubes (5) suivant des nappes planes (18) parallèles entre elles, des tirants (14) de maintien des plaques entretoises (10) disposés à l'intérieur du faisceau parallèlement aux parties rectilignes des tubes (5) et des ensembles de barres antivibratoires (13) intercalées entre les parties cintrées (5b) des tubes (5) disposés suivant des nappes adjacentes (18), caractérisé par le fait qu'il comporte de plus, pour le maintien d'au moins un ensemble de barres antivibratoires (13), disposées entre les tubes (5) de deux nappes adjacentes (18), au moins un arceau métallique (20) présentant une forme analogue à la forme des parties cintrées (5b) des tubes (5) du faisceau, fixé à chacune de ses extrémités à la plaque entretoise (10a) située le plus près des parties cintrées (5b) des tubes (5), dans le prolongement de deux tirants (14), intercalé entre deux tubes (5) d'une nappe de tubes (18) et comportant des moyens de fixation (22) de l'ensemble des barres antivibratoires (13) intercalées entre la nappe (18) dans laquelle l'arceau (20) est disposé et au moins une nappe adjacente. 1.- Heat exchanger comprising a bundle of heat exchange tubes (5) bent into a U and each comprising two rectilinear parts (5a) and a curved part (5b), a tubular plate (3) and a plurality of plates spacers (10) parallel to each other and spaced apart in the longitudinal direction of the rectilinear parts (5a) of the tubes (5), in which the tubes (5) of the bundle are engaged inside through openings ensuring the maintenance of the tubes ( 5) along flat sheets (18) parallel to each other, tie rods (14) for holding the spacer plates (10) arranged inside the bundle parallel to the straight parts of the tubes (5) and the sets of anti-vibration bars (13 ) interposed between the curved parts (5b) of the tubes (5) arranged in adjacent plies (18), characterized in that it further comprises, for maintaining at least one set of anti-vibration bars (13), arranged between the tubs es (5) of two adjacent plies (18), at least one metal hoop (20) having a shape analogous to the shape of the curved parts (5b) of the tubes (5) of the bundle, fixed at each of its ends to the plate spacer (10a) located closest to the curved parts (5b) of the tubes (5), in the extension of two tie rods (14), interposed between two tubes (5) of a sheet of tubes (18) and comprising means fixing (22) of the set of anti-vibration bars (13) interposed between the ply (18) in which the arch (20) is arranged and at least one adjacent ply. 2.- Echangeur de chaleur suivant la revendication 1, caractérisé par le fait que l'arceau métallique (20) est constitué par des segments successifs (21) assemblés entre eux par des dispositifs d'assemblage (22) assurant également la fixation des barres antivibratoires (13). 2.- heat exchanger according to claim 1, characterized in that the metal hoop (20) is constituted by successive segments (21) assembled together by assembly devices (22) also ensuring the fixing of the bars anti-vibration (13). 3.- Echangeur de chaleur suivant la revendication 2, caractérisé par le fait que l'arceau (20) présentant une forme semi-circulaire est constitué par des segments successifs (21) en forme d'arcs-de-cercle. 3.- Heat exchanger according to claim 2, characterized in that the hoop (20) having a semi-circular shape is constituted by successive segments (21) in the form of arcs-of-circle. 4.- Echangeur de chaleur suivant l'une quelconque des revendications 2 et 3, caractérisé par le fait que les segments successifs (21) de l'arceau (20) sont assemblés entre eux par vissage et comportent des parties d'assemblage (22a, 22b ; 21a, 21b) entre lesquelles sont serrées les barres antivibratoires (13). 4.- Heat exchanger according to any one of claims 2 and 3, characterized in that the successive segments (21) of the hoop (20) are assembled together by screwing and comprise assembly parts (22a , 22b; 21a, 21b) between which the anti-vibration bars (13) are clamped. 5.- Echangeur de chaleur suivant l'une quelconque des revendications 1 à 4, caractérisé par le fait que l'arceau (20) est fixé à chacune de ses extrémités sur la plaque entretoise (10a), par l'intermédiaire de dispositifs de fixation (19) constituant des tendeurs pour exercer une traction sur les extrémités de l'arceau (20). 5.- Heat exchanger according to any one of claims 1 to 4, characterized in that the hoop (20) is fixed at each of its ends to the spacer plate (10a), by means of fixing (19) constituting tensioners to exert traction on the ends of the arch (20). 6.- Echangeur de chaleur suivant la revendication 5, caractérisé par le fait que le dispositif de fixation (19) constitué sous la forme d'un tendeur comporte un premier élément (24) comprenant des moyens (24a) de fixation sur la plaque entretoise (10a) et un alésage taraudé (24b), une tige (25) comprenant deux parties filetées de pas inverses (25a, 25b) et un écrou (26) entre les deux parties filetées et un second élément (21'a) constituant un segment d'extrémité de l'arceau (20) comportant une ouverture taraudée, la tige filetée (25) pouvant être vissée simultanément par ses parties filetées de pas inverses (25a, 25b), dans les ouvertures taraudées (24b) du premier élément (24) solidaire de la plaque entretoise (10a) et (25a) du second élément (21'a) constituant un segment d'extrémité de l'arceau (20). 6.- Heat exchanger according to claim 5, characterized in that the fixing device (19) constituted in the form of a tensioner comprises a first element (24) comprising means (24a) for fixing on the spacer plate (10a) and a threaded bore (24b), a rod (25) comprising two threaded parts of reverse pitch (25a, 25b) and a nut (26) between the two threaded parts and a second element (21'a) constituting a end segment of the arch (20) comprising a threaded opening, the threaded rod (25) being able to be screwed simultaneously by its threaded portions of reverse pitch (25a, 25b), into the threaded openings (24b) of the first element ( 24) secured to the spacer plate (10a) and (25a) of the second element (21'a) constituting an end segment of the arch (20). 7.- Echangeur de chaleur suivant la revendication 6, caractérisé par le fait que le moyen de fixation (24a) du premier élément (24) sur la plaque entretoise (10a) est un alésage taraudé (24a) susceptible d'être vissé sur une partie filetée (14a) d'un tirant (14) traversant la plaque entretoise (10a). 7.- Heat exchanger according to claim 6, characterized in that the fixing means (24a) of the first element (24) on the spacer plate (10a) is a threaded bore (24a) capable of being screwed onto a threaded part (14a) of a tie rod (14) passing through the spacer plate (10a). 8.- Echangeur de chaleur suivant l'une quelconque des revendications 1 à 7, caractérisé par le fait qu'il comporte au moins deux arceaux (20a, 20b, 20c, 20d) disposés symétriquement par rapport à un plan de symétrie (28) du faisceau du générateur de vapeur. 8.- Heat exchanger according to any one of claims 1 to 7, characterized in that it comprises at least two arches (20a, 20b, 20c, 20d) arranged symmetrically with respect to a plane of symmetry (28) of the steam generator harness. 9.- Utilisation d'un échangeur de chaleur suivant l'une quelconque des revendications 1 à 8, comme générateur de vapeur d'un réacteur nucléaire à eau sous pression. 9.- Use of a heat exchanger according to any one of claims 1 to 8, as a steam generator of a pressurized water nuclear reactor.
EP94401848A 1993-08-20 1994-08-11 Heat exchanger with holding means of anti-vibration bars inserted between the bundle tubes Expired - Lifetime EP0639741B1 (en)

Applications Claiming Priority (2)

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FR9310158A FR2709174B1 (en) 1993-08-20 1993-08-20 Heat exchanger comprising means for holding anti-vibration bars inserted between the tubes of the heat exchanger bundle.
FR9310158 1993-08-20

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EP0639741A1 true EP0639741A1 (en) 1995-02-22
EP0639741B1 EP0639741B1 (en) 1996-12-11

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EP (1) EP0639741B1 (en)
JP (1) JPH07151487A (en)
KR (1) KR950006417A (en)
CN (1) CN1102500A (en)
CA (1) CA2130491A1 (en)
DE (1) DE69401103D1 (en)
FR (1) FR2709174B1 (en)

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EP0731328A1 (en) * 1995-03-09 1996-09-11 FRAMATOME Société Anonyme Heat exchanger with U-tubes, provided with a damping and anti- blowout device for securing tubes
FR2731508A1 (en) * 1995-03-09 1996-09-13 Framatome Sa HEAT EXCHANGER, WITH U-TUBES, EQUIPPED WITH A TUBE SETTING DEVICE, ANTI-VIBRATION AND ANTI-TAKE-OFF
EP1061320A2 (en) * 1995-03-09 2000-12-20 Framatome Heat exchanger with U-tubes, provided with a damping and anti- blowout device for securing tubes
EP1061320A3 (en) * 1995-03-09 2001-01-17 Framatome Heat exchanger with U-tubes, provided with a damping and anti- blowout device for securing tubes
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EP2003416A4 (en) * 2006-03-31 2014-04-09 Mitsubishi Heavy Ind Ltd Support structure for heat transfer tube
CN103659169A (en) * 2012-09-23 2014-03-26 丹阳市龙鑫合金有限公司 Method for manufacturing anti-vibration bar component of nuclear power unit
CN103659169B (en) * 2012-09-23 2016-06-22 丹阳市龙鑫合金有限公司 A kind of method of the anti-vibration bar assembly preparing nuclear power generating sets

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KR950006417A (en) 1995-03-21
CN1102500A (en) 1995-05-10
JPH07151487A (en) 1995-06-16
FR2709174B1 (en) 1995-11-17
US5447191A (en) 1995-09-05
FR2709174A1 (en) 1995-02-24
EP0639741B1 (en) 1996-12-11
DE69401103D1 (en) 1997-01-23
CA2130491A1 (en) 1995-02-21

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