EP0467755A1 - Device for antivibrationally securing tubes of a heat exchanger - Google Patents

Device for antivibrationally securing tubes of a heat exchanger Download PDF

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Publication number
EP0467755A1
EP0467755A1 EP91401914A EP91401914A EP0467755A1 EP 0467755 A1 EP0467755 A1 EP 0467755A1 EP 91401914 A EP91401914 A EP 91401914A EP 91401914 A EP91401914 A EP 91401914A EP 0467755 A1 EP0467755 A1 EP 0467755A1
Authority
EP
European Patent Office
Prior art keywords
bars
tubes
vibration
vibration bars
bun
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
EP91401914A
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German (de)
French (fr)
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EP0467755B1 (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
Original Assignee
Framatome SA
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Publication date
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Publication of EP0467755A1 publication Critical patent/EP0467755A1/en
Application granted granted Critical
Publication of EP0467755B1 publication Critical patent/EP0467755B1/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 an anti-vibration wedging device for tubes of a heat exchanger, such as a steam generator.
  • the steam generators in particular the steam generators of nuclear pressurized water reactors, comprise tubes bent in U having two branches crimped at their ends in a tubular plate.
  • the tubes are arranged in adjacent flat layers.
  • the curved parts of the bundle tubes which are juxtaposed at its upper part have radii of curvature different from each other and are placed adjacent to form a structure of substantially hemispherical shape called a bun.
  • the circulation of the fluid in contact with the tubes can cause vibrations which are liable to cause damage to these tubes if they are not maintained effectively.
  • the right part of the tubes is engaged in spacers located at regular distances from each other according to the height of the beam. These straight parts are therefore effectively maintained by rigid elements.
  • the curved parts of the tubes of the bundle constituting the bun must also be maintained and generally used for this are spacer bars which are interposed each between two plies of adjacent tubes of the bundle and arranged in substantially radial directions of the bun. These spacer bars are generally connected two by two in an articulated manner at one of their ends arranged towards the inside of the bun and placed in an angular manner to form V-shaped structures.
  • the outer ends of the antivibration bars opposite their articulated ends project from the tubes constituting the outer layer of the bun and are interconnected by connecting means ensuring the maintenance of the antivibration bars.
  • the object of the invention is therefore to propose a device for anti-vibration wedging of tubes of a steam generator comprising a bundle of tubes bent in a U fixed at their ends in a tubular plate, arranged in adjacent layers and whose curved parts opposite the tubular plate and juxtaposed constitute a set of substantially hemispherical shape called a bun, the wedging device comprising a set of anti-vibration bars each interposed between the curved portions of two adjacent plies of bundle tubes and arranged in a substantially radial direction of the bun , so as to have one end outside the bun and a set of connecting means between the outer end parts of the anti-vibration bars, this wedging device having a small footprint, which can be placed very quickly and very easily, too good in the case of a new fa generator briquetted in the factory than in the case of a used steam generator during maintenance and repair and allowing to ensure a very good alignment and a precise adjustment of the spacing of the anti-vibration bars.
  • the outer ends of the anti-vibration bars arranged in a plurality of sets of at least two bars in which the bars are aligned have aligned through openings, one of which is threaded
  • a means of connecting the ends of the anti-vibration bars is associated with each of the sets of bars and each of the connecting means is constituted by a pin having a threaded portion at the one of its ends and one end opposite to the threaded part constituting a screwing and unscrewing head and at least one spacer of tubular shape whose length corresponds substantially to the diameter of the tubes of a sheet, the pin being inserted into the aligned openings of a set of anti-vibration bars and in the bore of at least one spacer interposed between two anti-vibration bars, screwed into the threaded opening and blocked by a rotation blocking means.
  • Figure 1 is an elevational view in partial section of a steam generator of a pressurized water nuclear reactor comprising anti-vibration bars for holding the tubes of the bundle.
  • Figure 2 is a sectional view of a wedging device according to the invention, in its part located above the bun of the steam generator.
  • FIG. 3 is a view along 3 of FIG. 2.
  • Figure 4 and a view similar to the view of Figure 3 relating to a first alternative embodiment of a wedging device according to the invention.
  • Figure 5 is a view similar to the view of Figure 3 on a second alternative embodiment of a timing device according to the invention.
  • the casing 2 contains the bundle of tubes of the steam generator constituted by tubes 5 bent in a U and comprising at their upper part, semi-circular hangers constituting the bun of the steam generator.
  • the straight parts 5a of the bundle tubes are crimped at their ends in 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 through an inlet pipe 6a, flows through the tubes of the bundle then exits through an outlet pipe 6b.
  • the bundle of tubes 5 is surrounded by a bundle envelope 9 making it possible to channel the feed water entering the envelope 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 located around the bundle envelope 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 come out in the form steam through the upper tube 12 of the steam generator.
  • the upper part of the bundle of tubes called a bun is formed by the juxtaposition of semicircular hangers arranged in successive layers in which the radii of the hangers are decreasing from the outside to the inside of the beam.
  • the various successive layers of tubes of the bundle parallel to the central layer shown in FIG. 1 comprise external hangers of decreasing diameters, so that the upper part of the bundle or bun constitutes a substantially hemispherical assembly.
  • the straight part 5a of the tubes 5 is 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.
  • anti-vibration bars 15 formed in the form of compasses articulated at their inner end 15a and introduced between the layers of successive tubes, at the level of the hangers.
  • the outer ends 15b of the branches of the anti-vibration bars project from the upper surface of the bun and allow the fixing of the anti-vibration bars.
  • any branch of an assembly 15 in the form of a compass will be designated by anti-vibration bars.
  • FIG 2 there is shown a section of the curved part of two tubes 16a and 16b of the bundle of the steam generator arranged in two adjacent layers and placed at the outer part of these layers.
  • the external tubes such as 16a and 16b of the successive layers of the bundle of the steam generator define the external surface of the hemispherical bun.
  • an element 17 of a device anti-vibration wedging according to the invention disposed in the bun of the steam generator.
  • the element 17 of the wedging device comprises a first anti-vibration bar 18a interposed between the sheet of tubes in which the tube 16a is placed and an adjacent sheet of tubes, a second anti-vibration bar 18b interposed between the sheet of tubes in which the tube is placed tube 16a and the adjacent ply of tubes in which the tube 16b is placed, a connecting pin 20 and a spacer 21.
  • the anti-vibration bars 18a and 18b are placed in positions aligned along an axis 22 perpendicular to the axis of the tubes 16a and 16b.
  • the end portions of the antivibration bars 18a and 18b remaining projecting outside the bun that is to say relative to the tubes 16a and 16b, after their positioning in the bun, are crossed by cylindrical openings 23 and 24 having for axis the alignment axis 22 of the two anti-vibration bars 18a and 18b.
  • the opening 23 is a smooth cylindrical opening while the opening 24 is tapped, so as to allow the screwing of a threaded part 20a of the spindle 20.
  • the end of the spindle 20 opposite its threaded end 20a constitutes a head 20b, the section of which can be, for example, of hexagonal shape.
  • the head 20b allows the screwing and unscrewing of the spindle 20 to be carried out, using an appropriate tool.
  • the spacer 21 has a tubular shape, the bore of this spacer having a diameter substantially equal to the diameter of the openings 23 and 24.
  • a plate 25 cut from a steel sheet or strip is fixed by a peripheral weld line 26 to the outer surface of the spacer. 21.
  • the welding of the plate 25 on the spacer 21 can be carried out by the TIG method.
  • the length in the axial direction of the spacer 21 is equal to the average diameter of the tubes constituting the sheet in which the tube 16a is placed.
  • the anti-vibration bars 18a and 18b and in particular their projecting end parts are placed in alignment with one another, in the direction 22 perpendicular to the axis of the tubes 16a and 16b.
  • the openings 23 and 24 are then aligned, so that the axis 22 constitutes their common axis.
  • the spacer 21 is interposed between the anti-vibration bars 18a and 18b, the bore of this tubular spacer being placed in alignment with the openings 23 and 24.
  • the stop plate 25, folded at 90 °, has a folded part 25a crossed by an opening 25b which is placed in alignment with the opening 23.
  • the pin 20 is introduced into the openings 25b and 23 and into the bore of the spacer 21 and then screwed inside the threaded opening 24 of the spacer 18b, using a clamping tool.
  • the pin 20 provides the connection between the end parts of the anti-vibration bars 18a and 18b and the tightening of these anti-vibration bars on the end surfaces of the spacer 21 whose length corresponds to the average diameter of the tubes of the sheet comprising the tube 16a.
  • the spacing of the antivibration bars 18a and 18b is thus fixed at a value making it possible to optimize the conditions of the antivibration setting of the tubes of the sheet comprising the tube 16a.
  • the spindle 20 After tightening the spindle 20, it can be secured against rotation by folding the end of the part 25a of the plate 25 above the head 20b of the spindle, as indicated by the arrow 27. In this way, the spindle 20 is not liable to loosen and the connecting elements of the anti-vibration bars 18a and 18b are not liable to come off, under the effect of vibrations, in the steam generator in service.
  • the whole anti-vibration wedging device of the bundle tubes arranged in the bun is thus perfectly held in place and ensures effective wedging of the various plies of tubes in their curved part.
  • the anti-vibration bars aligned 28a to 28e have a projecting part relative to the tubes 29a, 29b, ..., located furthest outside in the layers of successive tubes.
  • the anti-vibration bars 28a, ..., 28e are crossed by openings having the axis 32 as their common axis.
  • the aligned openings passing through the anti-vibration bars are formed by smooth holes, with the exception of the opening passing through the last anti-vibration bar in the row (the bar 28e in FIG. 4) which is constituted by a tapped hole.
  • the anti-vibration bars 28a, ..., 28e are interconnected by their projecting end part, by means of a pin 30 inserted inside the aligned openings of the bars anti-vibration and inside the bores of the spacers 31a, 31b, 31c and 31d arranged between the successive anti-vibration bars 28a, ..., 28e.
  • the pin 30 has a threaded end which is screwed inside the tapped hole of the anti-vibration bar 28e, so as to ensure the connection between the anti-vibration bars and the tightening of these anti-vibration bars against the spacers.
  • the spindle 30 has a head 30b making it possible to screw or even unscrew the spindle 30.
  • the spacers 31a, 31b, 31c and 31d have a length in the axial direction 32 equal to the average diameter of the tubes, respectively 29a, 29b, 29c, 29d constituting the plies of successive tubes maintained by the spacers 28a, ..., 28e.
  • the blocking in rotation of the spindle 30 can be carried out in an identical manner to the blocking of the spindle 20 shown in FIG. 2.
  • the spacer 31a located closest to the head 30b of the spindle 30 comprises a stop plate welded on its external surface, this plate being folded after tightening of the spindle on the head 30b.
  • the ends of the antivibration bars 33a, 33b and 33c projecting from the tubes 34a and 34b located outside of successive layers of tubes are in offset positions, due to the relative arrangement of the tubes 34a and 34b of the two successive layers.
  • the outer tube 34a of the first ply has a radius of curvature at its arch less than the radius of curvature of the curved part of the tube 34b, these differences in radius of curvature resulting from the geometry of the bun of the steam generator.
  • the projecting part of the anti-vibration bar 33a is set back relative to the projecting parts of the anti-vibration bars 33b and 33c.
  • the outer end parts of the antivibration bars 33a, 33b and 33c can be connected by connecting devices 35a and 35b similar to the devices 17 shown in FIGS. 2 and 3.
  • the anti-vibration bar 33a is traversed by a smooth opening and the bar 33b by a tapped opening, these openings having a common axis 36a.
  • the device 35a comprising a pin 38 and a spacer 37 makes it possible to make the connection between the end parts of the bars 33a and 33b aligned in the direction of the axis 36a.
  • the bar 33b is also crossed by a smooth opening, in its part located towards the outside, relative to the tapped opening aligned along the axis 36a.
  • the bar 33c is pierced with a tapped opening having the axis 36b as a common axis with the smooth opening passing through the bar 33b.
  • the device 35b comprising a pin and a spacer makes it possible to ensure the connection between the bars 33b and 33c.
  • the wedging device according to the invention has the advantage of making the connection between the antivibration bars inserted between the layers of tubes inside the bun of the steam generator, without requiring welding. Any suitable material can therefore be used to form the anti-vibration bars which are not affected by the welding operations.
  • the device according to the invention makes it possible to ensure very good alignment of the anti-vibration bars arranged in a row, thanks to the use of a connecting element constituted by a pin introduced into aligned openings of the anti-vibration bars.
  • the device according to the invention comprises connecting elements between the antivibration bars whose volume is relatively small.
  • the device according to the invention makes it possible to wedge the tubes with a spacing between the anti-vibration bars maintained at a fixed value.
  • the anti-vibration wedging device according to the invention can be used in the case of any heat exchanger comprising bent tubes arranged in sheets that are 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)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The antivibrational bars are arranged as a plurality of sets of at least two bars (18a, 18b), in which the external ends of the bars are aligned according to an axis (22). The external end parts of the antivibrational bars (18a, 18b) comprise aligned through-openings (23, 24). The opening (24) is threaded. The ends of the bars (18a, 18b) are connected by a pin (20) having a threaded part (20a) at one of its ends and a screwing and unscrewing head (20b) at its other end. The pin (20) is introduced into the aligned openings (23, 24) and into the bore of a tubular distance piece (21) interposed between the antivibrational bars (18a, 18b). After screwing into the threaded opening (24), the pin (20) is rotationally locked by a locking means (25). <IMAGE>

Description

L'invention concerne un dispositif de calage antivibratoire de tubes d'un échangeur de chaleur, tel qu'un générateur de vapeur.The invention relates to an anti-vibration wedging device for tubes of a heat exchanger, such as a steam generator.

Les générateurs de vapeur, en particulier les générateurs de vapeur des réacteurs nucléaires à eau sous pression, comportent des tubes pliés en U présentant deux branches serties à leurs extrémités dans une plaque tubulaire. Les tubes sont disposés suivant des nappes planes adjacentes. Les parties courbes des tubes du faisceau qui sont juxtaposées à sa partie supérieure présentent des rayons de courbure différents les uns des autres et sont placées de manière adjacente pour constituer une structure de forme sensiblement hémisphérique appelée chignon.The steam generators, in particular the steam generators of nuclear pressurized water reactors, comprise tubes bent in U having two branches crimped at their ends in a tubular plate. The tubes are arranged in adjacent flat layers. The curved parts of the bundle tubes which are juxtaposed at its upper part have radii of curvature different from each other and are placed adjacent to form a structure of substantially hemispherical shape called a bun.

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 de ces 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.During operation of the steam generator, high temperature pressurized water flows through the bundle tubes and potable water is brought into contact with the outer surface of these tubes, along which it moves in the direction vertical by heating and then vaporizing, to come out in the form of vapor at the top of the generator.

La circulation du fluide au contact des tubes peut provoquer des vibrations qui sont susceptibles d'entraîner des détériorations de ces tubes s'ils ne sont pas maintenus de manière efficace.The circulation of the fluid in contact with the tubes can cause vibrations which are liable to cause damage to these tubes if they are not maintained effectively.

La partie droite des tubes est engagée dans des entretoises situées à des distances régulières les unes des autres suivant la hauteur du faisceau. Ces parties droites sont donc maintenues de manière efficace par des éléments rigides. Les parties courbes des tubes du faisceau constituant le chignon doivent également être maintenues et l'on utilise généralement pour cela des barres entretoises qui sont intercalées chacune entre deux nappes de tubes adjacents du faisceau et disposées suivant des directions sensiblement radiales du chignon. Ces barres entretoises sont généralement reliées deux à deux de manière articulée à l'une de leurs extrémités disposée vers l'intérieur du chignon et placées de manière angulaire pour constituer des structures en forme de V.The right part of the tubes is engaged in spacers located at regular distances from each other according to the height of the beam. These straight parts are therefore effectively maintained by rigid elements. The curved parts of the tubes of the bundle constituting the bun must also be maintained and generally used for this are spacer bars which are interposed each between two plies of adjacent tubes of the bundle and arranged in substantially radial directions of the bun. These spacer bars are generally connected two by two in an articulated manner at one of their ends arranged towards the inside of the bun and placed in an angular manner to form V-shaped structures.

Les extrémités extérieures des barres antivibratoires opposées à leurs extrémités articulées sont saillantes par rapport aux tubes constituant la couche externe du chignon et sont reliées entre elles par des moyens de liaison assurant le maintien des barres antivibratoires.The outer ends of the antivibration bars opposite their articulated ends project from the tubes constituting the outer layer of the bun and are interconnected by connecting means ensuring the maintenance of the antivibration bars.

On a proposé divers moyens de liaison des extrémités extérieures des barres antivibratoires utilisant des éléments de fixation placés sur la surface supérieure du chignon.Various means of connecting the outer ends of the antivibration bars have been proposed using fastening elements placed on the upper surface of the bun.

On a par exemple proposé de souder les extrémités des barres antivibratoires sur des éléments courbes disposés suivant des plans méridiens du chignon.For example, it has been proposed to weld the ends of the anti-vibration bars on curved elements arranged along meridian planes of the bun.

On a également proposé de fixer les extrémités des barres antivibratoires, par exemple par soudure, sur des anneaux sensiblement parallèles reposant sur la surface supérieure du chignon. Dans tous les cas, la fixation des barres antivibratoires nécessite des opérations complexes mettant le plus souvent en oeuvre des soudures qui doivent être effectuées au voisinage des tubes du faisceau qui risquent ainsi de subir certaines détériorations. De plus, les matériaux constituant les barres antivibratoires doivent être choisis pour permettre leur soudage et éventuellement leur traitement après soudage, dans de bonnes conditions métallurgiques.It has also been proposed to fix the ends of the anti-vibration bars, for example by welding, on substantially parallel rings resting on the upper surface of the bun. In all cases, the fixing of the anti-vibration bars requires complex operations, most often using welds which must be carried out in the vicinity of the tubes of the bundle, which thus risk being subjected to certain deteriorations. In addition, the materials constituting the anti-vibration bars must be chosen to allow their welding and possibly their treatment after welding, in good metallurgical conditions.

On a également proposé des dispositifs de liaison mécanique permettant de relier les extrémités extérieures des barres antivibratoires à des pièces de fixation telles que des anneaux de retenue reposant sur la surface extérieure du chignon.Mechanical connection devices have also been proposed making it possible to connect the outer ends of the anti-vibration bars to pieces of fasteners such as retaining rings resting on the outer surface of the bun.

Ces dispositifs sont relativement complexes et nécessitent pour leur fixation l'utilisation d'éléments complémentaires lourds et volumineux rapportés sur le chignon. En outre, ces dispositifs ne permettent pas d'assurer un très bon alignement des barres antivibratoires et de régler de manière précise le jeu existant entre deux barres antivibratoires successives entre lesquelles est intercalée une nappe de tubes.These devices are relatively complex and require for their fixing the use of heavy and bulky complementary elements attached to the bun. In addition, these devices do not make it possible to ensure very good alignment of the anti-vibration bars and to precisely regulate the play existing between two successive anti-vibration bars between which a sheet of tubes is interposed.

Le but de l'invention est donc de proposer une dispositif de calage antivibratoire de tubes d'un générateur de vapeur comportant un faisceau de tubes pliés en U fixés à leurs extrémités dans une plaque tubulaire, disposés suivant des nappes adjacentes et dont les parties cintrées opposées à la plaque tubulaire et juxtaposées constituent un ensemble de forme sensiblement hémisphérique appelé chignon, le dispositif de calage comprenant un ensemble de barres antivibratoires intercalées chacune entre les partie cintrées de deux nappes adjacentes de tubes du faisceau et disposées dans une direction sensiblement radiale du chignon, de manière à présenter une extrémité à l'extérieur du chignon et un ensemble de moyens de liaison entre les parties d'extrémité extérieure des barres antivibratoires, ce dispositif de calage ayant un faible encombrement, pouvant être placé très rapidement et très facilement, aussi bien dans le cas d'un générateur de vapeur neuf fabriqué en usine que dans le cas d'un générateur de vapeur usagé en cours d'entretien et de réparation et permettant d'assurer un très bon alignement et un réglage précis de l'écartement des barres antivibratoires.The object of the invention is therefore to propose a device for anti-vibration wedging of tubes of a steam generator comprising a bundle of tubes bent in a U fixed at their ends in a tubular plate, arranged in adjacent layers and whose curved parts opposite the tubular plate and juxtaposed constitute a set of substantially hemispherical shape called a bun, the wedging device comprising a set of anti-vibration bars each interposed between the curved portions of two adjacent plies of bundle tubes and arranged in a substantially radial direction of the bun , so as to have one end outside the bun and a set of connecting means between the outer end parts of the anti-vibration bars, this wedging device having a small footprint, which can be placed very quickly and very easily, too good in the case of a new fa generator briquetted in the factory than in the case of a used steam generator during maintenance and repair and allowing to ensure a very good alignment and a precise adjustment of the spacing of the anti-vibration bars.

Dans ce but, les extrémités extérieures des barres antivibratoires disposées suivant une pluralité d'ensembles d'au moins deux barres dans lesquels les barres sont alignées comportent des ouvertures traversantes alignées dont l'une est taraudée, un moyen de liaison des extrémités des barres antivibratoires est associé à chacun des ensembles de barres et chacun des moyens de liaison est constitué par une broche ayant une partie filetée à l'une de ses extrémités et une extrémité opposée à la partie filetée constituant une tête de vissage et de dévissage et au moins une entretoise de forme tubulaire dont la longueur correspond sensiblement au diamètre des tubes d'une nappe, la broche étant introduite dans les ouvertures alignées d'un ensemble de barres antivibratoires et dans l'alésage d'au moins une entretoise intercalée entre deux barres antivibratoires, vissée dans l'ouverture taraudée et bloquée par un moyen de blocage en rotation.For this purpose, the outer ends of the anti-vibration bars arranged in a plurality of sets of at least two bars in which the bars are aligned have aligned through openings, one of which is threaded, a means of connecting the ends of the anti-vibration bars is associated with each of the sets of bars and each of the connecting means is constituted by a pin having a threaded portion at the one of its ends and one end opposite to the threaded part constituting a screwing and unscrewing head and at least one spacer of tubular shape whose length corresponds substantially to the diameter of the tubes of a sheet, the pin being inserted into the aligned openings of a set of anti-vibration bars and in the bore of at least one spacer interposed between two anti-vibration bars, screwed into the threaded opening and blocked by a rotation blocking means.

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 mode de réalisation d'un dispositif de calage suivant l'invention utilisé dans le cas d'un générateur de vapeur d'un réacteur nucléaire à eau sous pression.In order to clearly understand the invention, we will now describe, by way of nonlimiting example, with reference to the attached figures, an embodiment of a wedging device according to the invention used in the case of '' a steam generator of a pressurized water nuclear reactor.

La figure 1 est une vue en élévation et en coupe partielle d'un générateur de vapeur d'un réacteur nucléaire à eau sous pression comportant des barres antivibratoires de maintien des tubes du faisceau.Figure 1 is an elevational view in partial section of a steam generator of a pressurized water nuclear reactor comprising anti-vibration bars for holding the tubes of the bundle.

La figure 2 est une vue en coupe d'un dispositif de calage suivant l'invention, dans sa partie située au-dessus du chignon du générateur de vapeur.Figure 2 is a sectional view of a wedging device according to the invention, in its part located above the bun of the steam generator.

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

La figure 4 et une vue analogue à la vue de la figure 3 relative à une première variante de réalisation d'un dispositif de calage suivant l'invention.Figure 4 and a view similar to the view of Figure 3 relating to a first alternative embodiment of a wedging device according to the invention.

La figure 5 est une vue analogue à la vue de la figure 3 relative à une seconde variante de réalisation d'un dispositif de calage suivant l'invention.Figure 5 is a view similar to the view of Figure 3 on a second alternative embodiment of a timing device according to the invention.

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 pliés en U et comportant à leur partie supérieure, des cintres semi-circulaires constituant le chignon du générateur de vapeur.The casing 2 contains the bundle of tubes of the steam generator constituted by tubes 5 bent in a U and comprising at their upper part, semi-circular hangers constituting the bun of the steam generator.

Les parties droites 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 in 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 pénètre 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 through an inlet pipe 6a, flows through the tubes of the bundle then exits 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 la forme de vapeur par la tubulure supérieure 12 du générateur de vapeur.The bundle of tubes 5 is surrounded by a bundle envelope 9 making it possible to channel the feed water entering the envelope 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 located around the bundle envelope 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 come out in the form steam through the upper tube 12 of the steam generator.

La partie supérieure du faisceau de tubes appelée chignon est constituée par la juxtaposition de cintres de forme semi-circulaire disposés suivant des nappes successives dans lesquelles les rayons des cintres sont décroissants de l'extérieur vers l'intérieur du faisceau.The upper part of the bundle of tubes called a bun is formed by the juxtaposition of semicircular hangers arranged in successive layers in which the radii of the hangers are decreasing from the outside to the inside of the beam.

De plus, les différentes nappes successives de tubes du faisceau parallèles à la couche centrale représentée sur la figure 1 comportent des cintres extérieurs de diamètres décroissants, si bien que la partie supérieure du faisceau ou chignon constitue un ensemble de forme sensiblement hémisphérique.In addition, the various successive layers of tubes of the bundle parallel to the central layer shown in FIG. 1 comprise external hangers of decreasing diameters, so that the upper part of the bundle or bun constitutes a substantially hemispherical assembly.

La partie rectiligne 5a des tubes 5 est maintenue 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.The straight part 5a of the tubes 5 is 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.

Les parties cintrées des tubes situées à l'extrémité supérieure du faisceau sont maintenues par des barres antivibratoires 15 constituées sous la forme de compas articulés à leur extrémité intérieure 15a et introduites entre les couches de tubes successives, au niveau des cintres.The curved parts of the tubes situated at the upper end of the bundle are held by anti-vibration bars 15 formed in the form of compasses articulated at their inner end 15a and introduced between the layers of successive tubes, at the level of the hangers.

Les extrémités extérieures 15b des branches des barres antivibratoires sont saillantes par rapport à la surface supérieure du chignon et permettent de réaliser la fixation des barres antivibratoires.The outer ends 15b of the branches of the anti-vibration bars project from the upper surface of the bun and allow the fixing of the anti-vibration bars.

Par la suite, on désignera par barres antivibratoires une branche quelconque d'un ensemble 15 en forme de compas.Subsequently, any branch of an assembly 15 in the form of a compass will be designated by anti-vibration bars.

Sur la figure 2, on a représenté un tronçon de la partie cintrée de deux tubes 16a et 16b du faisceau du générateur de vapeur disposés dans deux nappes adjacentes et placés à la partie externe de ces nappes. Les tubes externes tels que 16a et 16b des nappes successives du faisceau du générateur de vapeur définissent la surface extérieure du chignon de forme hémisphérique.In Figure 2, there is shown a section of the curved part of two tubes 16a and 16b of the bundle of the steam generator arranged in two adjacent layers and placed at the outer part of these layers. The external tubes such as 16a and 16b of the successive layers of the bundle of the steam generator define the external surface of the hemispherical bun.

On a également représenté sur la figure 2 ainsi que sur la figure 3, un élément 17 d'un dispositif de calage antivibratoire suivant l'invention disposé dans le chignon du générateur de vapeur.Also shown in Figure 2 and in Figure 3, an element 17 of a device anti-vibration wedging according to the invention disposed in the bun of the steam generator.

L'élément 17 du dispositif de calage comporte une première barre antivibratoire 18a intercalée entre la nappe de tubes dans laquelle est placée le tube 16a et une nappe de tubes adjacente, une seconde barre antivibratoire 18b intercalée entre la nappe de tubes dans laquelle est placé le tube 16a et la nappe de tubes adjacente dans laquelle est placé le tube 16b, une broche de liaison 20 et une entretoise 21.The element 17 of the wedging device comprises a first anti-vibration bar 18a interposed between the sheet of tubes in which the tube 16a is placed and an adjacent sheet of tubes, a second anti-vibration bar 18b interposed between the sheet of tubes in which the tube is placed tube 16a and the adjacent ply of tubes in which the tube 16b is placed, a connecting pin 20 and a spacer 21.

Les barres antivibratoires 18a et 18b sont placées dans des positions alignées suivant un axe 22 perpendiculaire à l'axe des tubes 16a et 16b.The anti-vibration bars 18a and 18b are placed in positions aligned along an axis 22 perpendicular to the axis of the tubes 16a and 16b.

Selon l'invention, les parties d'extrémité des barres antivibratoires 18a et 18b restant saillantes à l'extérieur du chignon, c'est-à-dire par rapport aux tubes 16a et 16b, après leur mise en place dans le chignon, sont traversées par des ouvertures cylindriques 23 et 24 ayant pour axe l'axe d'alignement 22 des deux barres antivibratoires 18a et 18b.According to the invention, the end portions of the antivibration bars 18a and 18b remaining projecting outside the bun, that is to say relative to the tubes 16a and 16b, after their positioning in the bun, are crossed by cylindrical openings 23 and 24 having for axis the alignment axis 22 of the two anti-vibration bars 18a and 18b.

L'ouverture 23 est une ouverture cylindrique lisse alors que l'ouverture 24 est taraudée, de manière à permettre le vissage d'une partie filetée 20a de la broche 20.The opening 23 is a smooth cylindrical opening while the opening 24 is tapped, so as to allow the screwing of a threaded part 20a of the spindle 20.

L'extrémité de la broche 20 opposée à son extrémité filetée 20a constitue une tête 20b dont la section peut être par exemple de forme hexagonale. La tête 20b permet d'effectuer le vissage et le dévissage de la broche 20, en utilisant un outil approprié.The end of the spindle 20 opposite its threaded end 20a constitutes a head 20b, the section of which can be, for example, of hexagonal shape. The head 20b allows the screwing and unscrewing of the spindle 20 to be carried out, using an appropriate tool.

L'entretoise 21 présente une forme tubulaire, l'alésage de cette entretoise ayant un diamètre sensiblement égal au diamètre des ouvertures 23 et 24.The spacer 21 has a tubular shape, the bore of this spacer having a diameter substantially equal to the diameter of the openings 23 and 24.

Une plaquette 25 découpée dans une tôle ou un feuillard d'acier est fixée par une ligne de soudure périphérique 26 sur la surface extérieure de l'entretoise 21. Le soudage de la plaquette 25 sur l'entretoise 21 peut être réalisé par la méthode TIG.A plate 25 cut from a steel sheet or strip is fixed by a peripheral weld line 26 to the outer surface of the spacer. 21. The welding of the plate 25 on the spacer 21 can be carried out by the TIG method.

La longueur dans la direction axiale de l'entretoise 21 est égale au diamètre moyen des tubes constituant la nappe dans laquelle est placé le tube 16a.The length in the axial direction of the spacer 21 is equal to the average diameter of the tubes constituting the sheet in which the tube 16a is placed.

Pour réaliser la mise en place et l'assemblage de l'élément 17 du dispositif de calage antivibratoire suivant l'invention, on réalise, dans un premier temps, comme dans la technique antérieure, la mise en place des barres antivibratoires 18a et 18b dans le chignon du générateur de vapeur. Les extrémités des barres antivibratoires 18a et 18b comportant les ouvertures 23 et 24 restent saillantes à l'extérieur du chignon du générateur de vapeur, après la mise en place des barres antivibratoires.To carry out the installation and assembly of the element 17 of the anti-vibration wedging device according to the invention, firstly, as in the prior art, the establishment of the anti-vibration bars 18a and 18b in the steam generator bun. The ends of the anti-vibration bars 18a and 18b having the openings 23 and 24 remain protruding outside the bun of the steam generator, after the establishment of the anti-vibration bars.

Les barres antivibratoires 18a et 18b et en particulier leurs parties d'extrémité saillantes sont placées dans l'alignement l'une de l'autre, suivant la direction 22 perpendiculaire à l'axe des tubes 16a et 16b.The anti-vibration bars 18a and 18b and in particular their projecting end parts are placed in alignment with one another, in the direction 22 perpendicular to the axis of the tubes 16a and 16b.

Les ouvertures 23 et 24 sont alors alignées, de manière que l'axe 22 constitue leur axe commun. L'entretoise 21 est intercalée entre les barres antivibratoires 18a et 18b, l'alésage de cette entretoise tubulaire étant placé dans l'alignement des ouvertures 23 et 24.The openings 23 and 24 are then aligned, so that the axis 22 constitutes their common axis. The spacer 21 is interposed between the anti-vibration bars 18a and 18b, the bore of this tubular spacer being placed in alignment with the openings 23 and 24.

La plaquette d'arrêt 25, pliée à 90°, présente une partie rabattue 25a traversée par une ouverture 25b qui est placée dans l'alignement de l'ouverture 23.The stop plate 25, folded at 90 °, has a folded part 25a crossed by an opening 25b which is placed in alignment with the opening 23.

La broche 20 est introduite dans les ouvertures 25b et 23 et dans l'alésage de l'entretoise 21 puis vissée à l'intérieur de l'ouverture taraudée 24 de l'entretoise 18b, en utilisant un outil de serrage.The pin 20 is introduced into the openings 25b and 23 and into the bore of the spacer 21 and then screwed inside the threaded opening 24 of the spacer 18b, using a clamping tool.

La broche 20 assure la liaison entre les parties d'extrémité des barres antivibratoires 18a et 18b et le serrage de ces barres antivibratoires sur les surfaces d'extrémité de l'entretoise 21 dont la longueur correspond au diamètre moyen des tubes de la nappe comportant le tube 16a. L'écartement des barres antivibratoires 18a et 18b est ainsi fixé à une valeur permettant d'optimiser les conditions du calage antivibratoire des tubes de la nappe comportant le tube 16a.The pin 20 provides the connection between the end parts of the anti-vibration bars 18a and 18b and the tightening of these anti-vibration bars on the end surfaces of the spacer 21 whose length corresponds to the average diameter of the tubes of the sheet comprising the tube 16a. The spacing of the antivibration bars 18a and 18b is thus fixed at a value making it possible to optimize the conditions of the antivibration setting of the tubes of the sheet comprising the tube 16a.

Après serrage de la broche 20, on peut assurer son blocage antirotation en rabattant l'extrémité de la partie 25a de la plaquette 25 au-dessus de la tête 20b de la broche, comme indiqué par la flèche 27. De cette manière, la broche 20 n'est pas susceptible de se desserrer et les éléments de liaison des barres antivibratoires 18a et 18b ne sont pas susceptibles de se détacher, sous l'effet des vibrations, dans le générateur de vapeur en service.After tightening the spindle 20, it can be secured against rotation by folding the end of the part 25a of the plate 25 above the head 20b of the spindle, as indicated by the arrow 27. In this way, the spindle 20 is not liable to loosen and the connecting elements of the anti-vibration bars 18a and 18b are not liable to come off, under the effect of vibrations, in the steam generator in service.

Il est bien évident que les extrémités des différentes barres antivibratoires introduites dans le chignon du générateur de vapeur peuvent être reliées deux à deux par des dispositifs tels que le dispositif 17 représenté sur les figures 2 et 3.It is obvious that the ends of the various anti-vibration bars introduced into the bun of the steam generator can be connected two by two by devices such as the device 17 shown in FIGS. 2 and 3.

L'ensemble du dispositif de calage antivibratoire des tubes du faisceau disposés dans le chignon est ainsi parfaitement maintenu en place et assure un calage efficace des différentes nappes de tubes dans leur partie cintrée.The whole anti-vibration wedging device of the bundle tubes arranged in the bun is thus perfectly held in place and ensures effective wedging of the various plies of tubes in their curved part.

Sur la figure 4, on voit un ensemble de barres antivibratoires 28a, 28b, 28c, 28d et 28e alignées suivant une direction 32 perpendiculaire aux axes des tubes 29a, 29b, 29c et 29d constituant des nappes successives de tubes intercalées entre les barres antivibratoires.In Figure 4, we see a set of anti-vibration bars 28a, 28b, 28c, 28d and 28e aligned in a direction 32 perpendicular to the axes of the tubes 29a, 29b, 29c and 29d constituting successive layers of tubes interposed between the anti-vibration bars.

Les barres antivibratoires alignées 28a à 28e comportent une partie saillante par rapport aux tubes 29a, 29b, ..., situés le plus à l'extérieur dans les nappes de tubes successives.The anti-vibration bars aligned 28a to 28e have a projecting part relative to the tubes 29a, 29b, ..., located furthest outside in the layers of successive tubes.

Dans ces parties saillantes, les barres antivibratoires 28a, ..., 28e sont traversées par des ouvertures ayant pour axe commun l'axe 32.In these projecting parts, the anti-vibration bars 28a, ..., 28e are crossed by openings having the axis 32 as their common axis.

Les ouvertures alignées traversant les barres antivibratoires sont constituées par des trous lisses, à l'exception de l'ouverture traversant la dernière barre antivibratoire de la rangée (la barre 28e sur la figure 4) qui est constituée par un trou taraudé.The aligned openings passing through the anti-vibration bars are formed by smooth holes, with the exception of the opening passing through the last anti-vibration bar in the row (the bar 28e in FIG. 4) which is constituted by a tapped hole.

Après leur mise en place dans le chignon du générateur de vapeur, les barres antivibratoires 28a, ..., 28e sont reliées entre elles par leur partie d'extrémité saillante, grâce à une broche 30 introduite à l'intérieur des ouvertures alignées des barres antivibratoires et à l'intérieur des alésages des entretoises 31a, 31b, 31c et 31d disposées entre les barres antivibratoires successives 28a, ..., 28e.After their installation in the bun of the steam generator, the anti-vibration bars 28a, ..., 28e are interconnected by their projecting end part, by means of a pin 30 inserted inside the aligned openings of the bars anti-vibration and inside the bores of the spacers 31a, 31b, 31c and 31d arranged between the successive anti-vibration bars 28a, ..., 28e.

La broche 30 comporte une extrémité filetée qui est vissée à l'intérieur du trou taraudé de la barre antivibratoire 28e, de manière à assurer la liaison entre les barres antivibratoires et le serrage de ces barres antivibratoires contre les entretoises. La broche 30 comporte une tête 30b permettant d'assurer le vissage ou, éventuellement, le dévissage de la broche 30.The pin 30 has a threaded end which is screwed inside the tapped hole of the anti-vibration bar 28e, so as to ensure the connection between the anti-vibration bars and the tightening of these anti-vibration bars against the spacers. The spindle 30 has a head 30b making it possible to screw or even unscrew the spindle 30.

Les entretoises 31a, 31b, 31c et 31d présentent une longueur dans la direction axiale 32 égale au diamètre moyen des tubes, respectivement 29a, 29b, 29c, 29d constituant les nappes de tubes successives maintenues par les entretoises 28a, ..., 28e.The spacers 31a, 31b, 31c and 31d have a length in the axial direction 32 equal to the average diameter of the tubes, respectively 29a, 29b, 29c, 29d constituting the plies of successive tubes maintained by the spacers 28a, ..., 28e.

De cette manière, on réalise en une seule opération, un alignement parfait d'une rangée de barres antivibratoires et une mise en place de ces barres antivibratoires de part et d'autre des nappes de tubes, avec un écartement assurant un calage optimisé des tubes.In this way, a perfect alignment of a row of anti-vibration bars is carried out in a single operation and a positioning of these anti-vibration bars on either side of the plies of tubes, with a spacing ensuring optimized wedging of the tubes.

Le blocage en rotation de la broche 30 peut être réalisé d'une manière identique au blocage de la broche 20 représentée sur la figure 2. L'entretoise 31a située le plus près de la tête 30b de la broche 30 comporte une plaquette d'arrêt soudée sur sa surface externe, cette plaquette étant repliée après serrage de la broche sur la tête 30b.The blocking in rotation of the spindle 30 can be carried out in an identical manner to the blocking of the spindle 20 shown in FIG. 2. The spacer 31a located closest to the head 30b of the spindle 30 comprises a stop plate welded on its external surface, this plate being folded after tightening of the spindle on the head 30b.

Sur la figure 5, on a représenté une seconde variante de réalisation d'éléments d'un dispositif de calage suivant l'invention.In Figure 5, there is shown a second alternative embodiment of elements of a wedging device according to the invention.

Les extrémités des barres antivibratoires 33a, 33b et 33c saillantes par rapport aux tubes 34a et 34b situés à l'extérieur de nappes de tubes successives sont dans des positions décalées, du fait de la disposition relative des tubes 34a et 34b des deux nappes successives.The ends of the antivibration bars 33a, 33b and 33c projecting from the tubes 34a and 34b located outside of successive layers of tubes are in offset positions, due to the relative arrangement of the tubes 34a and 34b of the two successive layers.

Le tube externe 34a de la première nappe présente un rayon de courbure au niveau de son cintre inférieur au rayon de courbure de la partie cintrée du tube 34b, ces différences de rayon de courbure résultant de la géométrie du chignon du générateur de vapeur.The outer tube 34a of the first ply has a radius of curvature at its arch less than the radius of curvature of the curved part of the tube 34b, these differences in radius of curvature resulting from the geometry of the bun of the steam generator.

Il en résulte que la partie saillante de la barre antivibratoire 33a se trouve en retrait par rapport aux parties saillantes des barres antivibratoires 33b et 33c.As a result, the projecting part of the anti-vibration bar 33a is set back relative to the projecting parts of the anti-vibration bars 33b and 33c.

Dans ce cas, les parties d'extrémité extérieures des barres antivibratoires 33a, 33b et 33c peuvent être reliées par des dispositifs de liaison 35a et 35b analogues aux dispositifs 17 représentés sur les figures 2 et 3.In this case, the outer end parts of the antivibration bars 33a, 33b and 33c can be connected by connecting devices 35a and 35b similar to the devices 17 shown in FIGS. 2 and 3.

La barre antivibratoire 33a est traversée par une ouverture lisse et la barre 33b par une ouverture taraudée, ces ouvertures ayant un axe commun 36a. Le dispositif 35a comportant une broche 38 et une entretoise 37 permet de réaliser la liaison entre les parties d'extrémité des barres 33a et 33b alignées suivant la direction de l'axe 36a.The anti-vibration bar 33a is traversed by a smooth opening and the bar 33b by a tapped opening, these openings having a common axis 36a. The device 35a comprising a pin 38 and a spacer 37 makes it possible to make the connection between the end parts of the bars 33a and 33b aligned in the direction of the axis 36a.

La barre 33b est également traversée par une ouverture lisse, dans sa partie située vers l'extérieur, par rapport à l'ouverture taraudée alignée suivant l'axe 36a.The bar 33b is also crossed by a smooth opening, in its part located towards the outside, relative to the tapped opening aligned along the axis 36a.

La barre 33c est percée d'une ouverture taraudée ayant l'axe 36b comme axe commun avec l'ouverture lisse traversant la barre 33b. Le dispositif 35b comportant une broche et une entretoise permet d'assurer la liaison entre les barres 33b et 33c.The bar 33c is pierced with a tapped opening having the axis 36b as a common axis with the smooth opening passing through the bar 33b. The device 35b comprising a pin and a spacer makes it possible to ensure the connection between the bars 33b and 33c.

Le dispositif de calage suivant l'invention présente l'avantage de réaliser la liaison entre les barres antivibratoires intercalées entre les nappes de tubes à l'intérieur du chignon du générateur de vapeur, sans nécessiter de soudure. On peut donc utiliser tout matériau adéquat pour constituer les barres antivibratoires qui ne sont pas affectées par les opérations de soudage.The wedging device according to the invention has the advantage of making the connection between the antivibration bars inserted between the layers of tubes inside the bun of the steam generator, without requiring welding. Any suitable material can therefore be used to form the anti-vibration bars which are not affected by the welding operations.

Il est possible de régler de manière très précise l'espacement entre les barres antivibratoires placées de part et d'autre d'une nappe de tubes, cet espacement étant fixé à une valeur correspondant au diamètre moyen des tubes dans la nappe considérée. En effet, ce diamètre moyen des tubes dans une nappe du faisceau d'un générateur de vapeur est susceptible de varier, si bien que l'utilisation d'entretoises de longueur variable permet d'optimiser l'écartement des barres antivibratoires. En outre, le dispositif suivant l'invention permet d'assurer un très bon alignement des barres antivibratoires disposées suivant une rangée, grâce à l'utilisation d'un élément de liaison constitué par une broche introduite dans des ouvertures alignées des barres antivibratoires.It is possible to very precisely adjust the spacing between the anti-vibration bars placed on either side of a sheet of tubes, this spacing being fixed at a value corresponding to the average diameter of the tubes in the sheet considered. In fact, this mean diameter of the tubes in a layer of the bundle of a steam generator is liable to vary, so that the use of spacers of variable length makes it possible to optimize the spacing of the anti-vibration bars. In addition, the device according to the invention makes it possible to ensure very good alignment of the anti-vibration bars arranged in a row, thanks to the use of a connecting element constituted by a pin introduced into aligned openings of the anti-vibration bars.

Le dispositif suivant l'invention comporte des éléments de liaison entre les barres antivibratoires dont le volume est relativement faible.The device according to the invention comprises connecting elements between the antivibration bars whose volume is relatively small.

Enfin, le dispositif suivant l'invention permet de réaliser le calage des tubes avec un écartement entre les barres antivibratoires maintenu à une valeur fixe.Finally, the device according to the invention makes it possible to wedge the tubes with a spacing between the anti-vibration bars maintained at a fixed value.

L'invention ne se limite pas aux modes de réalisation qui ont été décrits.The invention is not limited to the embodiments which have been described.

C'est ainsi qu'en fonction de la disposition des barres antivibratoires et de leur nombre, on peut envisager l'utilisation de broches de grande longueur assurant la liaison entre les parties d'extrémité d'un grand nombre de barres antivibratoires.Thus, depending on the arrangement of the antivibration bars and their number, it is possible to envisage the use of very long pins ensuring the connection between the end portions of a large number of antivibration bars.

On peut utiliser un moyen de blocage et de retenue de la broche différent d'une plaquette d'arrêt soudée sur l'entretoise située au voisinage de la tête de vissage et de dévissage de cette broche.One can use a blocking and retaining means of the spindle different from a stop plate welded on the spacer located in the vicinity of the screwing and unscrewing head of this spindle.

Enfin, le dispositif de calage antivibratoire suivant l'invention peut être utilisé dans le cas de tout échangeur de chaleur comportant des tubes cintrés disposés suivant des nappes parallèles entre elles.Finally, the anti-vibration wedging device according to the invention can be used in the case of any heat exchanger comprising bent tubes arranged in sheets that are parallel to each other.

Claims (5)

1.- Dispositif de calage antivibratoire de tubes d'un échangeur de chaleur comportant un faisceau de tubes pliés en U, fixés à leurs extrémités dans une plaque tubulaire, disposés suivant des nappes parallèles et dont les parties cintrées opposées à la plaque tubulaire et juxtaposées constituent un ensemble de forme sensiblement hémisphérique appelé chignon, le dispositif de calage comportant un ensemble de barres antivibratoires (18a, 18b, 28a, ..., 28e, 33a, 33b, 33c) intercalées chacune entre les parties cintrées de deux nappes adjacentes de tubes (16a, 16b, 29a, ..., 29d, 34a, 34b) du faisceau et disposées dans une direction sensiblement radiale du chignon, de manière à présenter une extrémité à l'extérieur du chignon et un ensemble de moyens de liaison entre les parties d'extrémité extérieures des barres antivibratoires, caractérisé par le fait que les extrémités extérieures des barres antivibratoires (18a, 18b, 29a, ..., 29d, 33a, 33b, 33c) disposées suivant une pluralité d'ensembles d'au moins deux barres dans lesquels les barres sont alignées comportent des ouvertures traversantes alignées (23, 24) dont l'une est taraudée, qu'un moyen de liaison des extrémités des barres antivibratoires est associé à chacun des ensembles de barres et que chacun des moyens de liaison est constitué par une broche (20, 30) ayant une partie filetée (20a) à l'une de ses extrémités et une extrémité opposée à la partie filetée (20a) constituant une tête de vissage et de dévissage (20b) et au moins une entretoise (21, 31a, ..., 31d, 37) de forme tubulaire dont la longueur correspond sensiblement au diamètre moyen des tubes (16a, 29a, ..., 29d, 34a) d'une nappe de tubes, la broche (20, 30, 38) étant introduite dans les ouvertures alignées d'un ensemble de barres antivibratoires et dans l'alésage d'au moins une entretoise intercalée entre deux barres antivibratoires, vissée dans l'ouverture taraudée et bloquée par un moyen de blocage antirotation (25). 1.- Anti-vibration wedging device for tubes of a heat exchanger comprising a bundle of tubes bent in a U, fixed at their ends in a tubular plate, arranged in parallel layers and whose curved parts opposite to the tube plate and juxtaposed constitute a substantially hemispherical assembly called a bun, the wedging device comprising a set of anti-vibration bars (18a, 18b, 28a, ..., 28e, 33a, 33b, 33c) each interposed between the curved portions of two adjacent plies of tubes (16a, 16b, 29a, ..., 29d, 34a, 34b) of the bundle and arranged in a substantially radial direction of the bun, so as to present an end outside the bun and a set of connecting means between the outer end parts of the anti-vibration bars, characterized in that the outer ends of the anti-vibration bars (18a, 18b, 29a, ..., 29d, 33a, 33b, 33c) have according to a plurality of sets of at least two bars in which the bars are aligned have aligned through openings (23, 24), one of which is threaded, that a means for connecting the ends of the anti-vibration bars is associated with each of the sets of bars and that each of the connecting means is constituted by a pin (20, 30) having a threaded part (20a) at one of its ends and an end opposite to the threaded part (20a) constituting a head screwing and unscrewing (20b) and at least one spacer (21, 31a, ..., 31d, 37) of tubular shape whose length substantially corresponds to the average diameter of the tubes (16a, 29a, ..., 29d, 34a) of a sheet of tubes, the spindle (20, 30, 38) being introduced into the aligned openings of a set of anti-vibration bars and into the bore of at least one spacer inserted between two anti-vibration bars, screwed into the threaded opening and blocked by an anti-rotation locking means (25). 2.- Dispositif suivant la revendication 1, caractérisé par le fait que le moyen de blocage antirotation de la broche (20) est constitué par une plaquette en tôle métallique (25) soudée sur la surface externe d'une entretoise (21) située au voisinage de la tête (25b) de vissage et de dévissage de la broche (20) comportant une partie (25a) traversée par une ouverture (25b) dans laquelle est engagée la broche (20), susceptible d'être rabattue sur la tête de vissage et de dévissage (20b) de la broche (20). 2.- Device according to claim 1, characterized in that the anti-rotation locking means of the spindle (20) consists of a sheet metal plate (25) welded to the external surface of a spacer (21) located at neighborhood of the head (25b) for screwing and unscrewing the spindle (20) comprising a part (25a) through which an opening (25b) in which the spindle (20) is engaged, capable of being folded down on the head screwing and unscrewing (20b) of the spindle (20). 3.- Dispositif suivant l'une quelconque des revendications 1 et 2, caractérisé par le fait que l'un au moins des moyens de liaison comporte au moins deux entretoises (31a, ..., 31d) intercalées chacune entre deux barres antivibratoires successives (28a, ..., 28e), les entretoises (31a, ..., 31d) ayant des longueurs différentes correspondant au diamètre moyen des tubes dans les nappes de tubes (29a, ..., 29d) entre lesquelles sont intercalées les barres antivibratoires (28a, ..., 28e). 3.- Device according to any one of claims 1 and 2, characterized in that at least one of the connecting means comprises at least two spacers (31a, ..., 31d) each interposed between two successive anti-vibration bars (28a, ..., 28e), the spacers (31a, ..., 31d) having different lengths corresponding to the average diameter of the tubes in the plies of tubes (29a, ..., 29d) between which the anti-vibration bars (28a, ..., 28e). 4.- Dispositif suivant l'une quelconque des revendications 1 et 2, dans le cas où les barres antivibratoires (33a, 33b, 33c) présentent des extrémités extérieures décalées dans la direction radiale du chignon, caractérisé par le fait que les moyens de liaison (35a, 35b) sont disposés sur les barres antivibratoires (33a, 33b, 33c) correspondantes, dans des positions décalées dans la direction radiale du chignon. 4.- Device according to any one of claims 1 and 2, in the case where the anti-vibration bars (33a, 33b, 33c) have outer ends offset in the radial direction of the bun, characterized in that the connecting means (35a, 35b) are arranged on the corresponding anti-vibration bars (33a, 33b, 33c), in positions offset in the radial direction of the bun. 5.- Dispositif suivant la revendication 1, dans le cas où l'un au moins des ensembles de barres antivibratoires comporte une pluralité de barres (28a, 28b, 28c, 28d, 28e) alignées suivant une direction (32) caractérisé par le fait que les barres antivibratoires (28a, ..., 28e) constituant l'ensemble sont traversées par des ouvertures lisses alignées ayant pour axe commun l'axe (32), à l'exception de l'une des barres antivibratoires (28e) disposée à l'extrémité de l'ensemble de barres (28a, ..., 28e) alignées qui est traversé par une ouverture taraudée. 5.- Device according to claim 1, in the case where at least one of the sets of anti-vibration bars comprises a plurality of bars (28a, 28b, 28c, 28d, 28e) aligned in a direction (32) characterized by the fact that the anti-vibration bars (28a, ..., 28e) constituting the assembly are crossed by aligned smooth openings having the axis (32) as a common axis, with the exception of one of the anti-vibration bars (28e) disposed at the end of the set of aligned bars (28a, ..., 28e) which is crossed by a tapped opening.
EP91401914A 1990-07-20 1991-07-09 Device for antivibrationally securing tubes of a heat exchanger Expired - Lifetime EP0467755B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9009331A FR2664965B1 (en) 1990-07-20 1990-07-20 DEVICE FOR ANTIVIBRATORY SETTING OF TUBES OF A HEAT EXCHANGER.
FR9009331 1990-07-20

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EP0467755A1 true EP0467755A1 (en) 1992-01-22
EP0467755B1 EP0467755B1 (en) 1994-11-02

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EP91401914A Expired - Lifetime EP0467755B1 (en) 1990-07-20 1991-07-09 Device for antivibrationally securing tubes of a heat exchanger

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EP (1) EP0467755B1 (en)
JP (1) JPH05157482A (en)
DE (1) DE69104925T2 (en)
ES (1) ES2064947T3 (en)
FR (1) FR2664965B1 (en)
ZA (1) ZA915684B (en)

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EP0639741A1 (en) * 1993-08-20 1995-02-22 Framatome Heat exchanger with holding means of anti-vibration bars inserted between the bundle tubes

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FR2711419B1 (en) * 1993-10-20 1996-02-02 Framatome Sa Device for anti-vibration wedging of tubes of a heat exchanger and use.
US5388638A (en) * 1993-12-28 1995-02-14 Phillips Petroleum Company Rod baffle heat exchanger
FR2731508B1 (en) * 1995-03-09 1997-05-09 Framatome Sa HEAT EXCHANGER, WITH U-TUBES, EQUIPPED WITH A TUBE SETTING DEVICE, ANTI-VIBRATION AND ANTI-TAKE-OFF
US6244330B1 (en) 1998-11-16 2001-06-12 Foster Wheeler Corporation Anti-vibration ties for tube bundles and related method
US6772832B2 (en) 2002-04-23 2004-08-10 Babcock & Wilcox Canada, Ltd. Heat exchanger tube support bar
US9697919B2 (en) * 2010-12-29 2017-07-04 Westinghouse Electric Company, Llc Anti-vibration tube support plate arrangement for steam generators
US8479392B2 (en) 2011-06-02 2013-07-09 Westinghouse Electric Company Llc Anti-vibration bar clamping tool and method
US20140116360A1 (en) * 2012-10-31 2014-05-01 Westinghouse Electric Company Llc Method and apparatus for securing tubes in a steam generator against vibration
EP3061099B1 (en) * 2013-10-24 2018-12-05 Holtec International Steam generator for nuclear steam supply system
WO2019150180A1 (en) 2018-02-02 2019-08-08 Bwxt Canada Ltd. Alternating offset u-bend support arrangement
CN113983854B (en) * 2021-10-22 2022-10-28 中国原子能科学研究院 Support structure for in-reactor heat exchanger

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FR2709174A1 (en) * 1993-08-20 1995-02-24 Framatome Sa Heat exchanger comprising means for holding anti-vibration bars interposed between the tubes of the heat exchanger bundle.
US5447191A (en) * 1993-08-20 1995-09-05 Framatome Heat exchanger including means for holding antivibration bars interposed between the tubes of the bundle of the exchanger

Also Published As

Publication number Publication date
ES2064947T3 (en) 1995-02-01
EP0467755B1 (en) 1994-11-02
DE69104925D1 (en) 1994-12-08
US5127469A (en) 1992-07-07
JPH05157482A (en) 1993-06-22
FR2664965A1 (en) 1992-01-24
ZA915684B (en) 1993-02-24
DE69104925T2 (en) 1995-03-16
FR2664965B1 (en) 1992-11-06

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