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
  • 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
• • 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 wedging device antivibration of tubes of a heat exchanger such than a steam generator.
• the circulation of the fluid in contact with the tubes can cause vibrations which are likely to cause damage to these tubes if they are not maintained effectively.
• the right side of the tubes is engaged in spacers located at regular distances from each other others depending on the height of the beam. These parts straight lines are therefore effectively maintained by rigid elements.
• the curved parts of the bundle tubes constituting the bun should also be maintained and we generally use spacer bars for this which are each inserted between two layers of adjacent tubes of the bundle and arranged in substantially radial directions of the bun. These spacer bars are generally linked two by two from hinged way at one of their ends arranged at inside the bun and placed angularly to form V-shaped structures
• the outer ends of the anti-vibration bars opposite their central part are protruding by relation to the tubes constituting the outer layer of the bun and are interconnected by connecting means ensuring the maintenance of anti-vibration bars.
• the fixing of the bars antivibration requires complex operations putting most often using welds which must be carried out in the vicinity of the beam tubes which risk thus to undergo certain deteriorations.
• the materials making up the anti-vibration bars must be chosen to allow their welding and possibly their treatment after welding, in good conditions metallurgical.
• a device has been proposed wedging comprising connecting means between the outer ends of anti-vibration bars arranged following sets of at least two bars in which bars are aligned and have openings through aligned one of which is tapped. Ways of the anti-vibration bars have a pin which is inserted into the aligned openings of the set of anti-vibration bars and in the bore spacers which are each inserted between two successive anti-vibration bars.
• the brooch which has a threaded end is screwed into the threaded opening an anti-vibration bar located at the end of the row.
• the spindle is also secured to an element of rotation lock which can be welded on a spacer.
• Such a device has advantages over mechanical devices known previously but requires the use of pins whose length is adapted to the number of bars and the length of the row anti-vibration bars whose ends are assembled between them. In some cases it is necessary use a very long spindle, which can have drawbacks with regard to the conditions the mechanical resistance of the spindle.
• the object of the invention is therefore to propose a anti-vibration wedging device for exchanger tubes of heat comprising a bundle of tubes bent in U, fixed at their ends in a tubular plate, arranged in parallel layers and the parts of which curved opposite the tube plate and juxtaposed constitute a set of substantially hemispherical shape called a bun, the wedging device comprising a set of antivibration bars inserted each between the curved parts of two adjacent layers of bundle tubes and arranged in a direction substantially radial of the bun, so as to present a end outside of the bun and means of connection between the outer end parts of the anti-vibration bars arranged in a plurality sets of at least two bars in which the bars are aligned in a straight row and have aligned through openings, this wedging device using elements modular that can be easily adapted to a number any of bars and a row of bars of a any length.
• Figure 1 is an elevational sectional view partial by a vertical plane of a steam generator of a pressurized water nuclear reactor.
• FIG. 2A is a partial view from above and in section along 2-2 of Figure 1, of an upper part the bun of a steam generator having a array of square pitch tubes and a wedging device anti-vibration according to the invention.
• FIG. 2B is a view similar to the view of the FIG. 2A, in the case of a steam generator having a bundle of triangular pitch tubes.
• Figure 3 is a sectional view through a plane perpendicular to the bundle of tube plies, one anti-vibration bar connection device according to a first embodiment.
• Figure 4 is a sectional view along 4-4 of Figure 3.
• Figure 5 is a top view along 5 of Figure 4.
• Figure 6 is a top view and in section partial of a connecting means of a set of bars antivibration of a wedging device according to the invention and according to a second embodiment.
• Figure 7 is a top view of means of connection of anti-vibration bars of a calibration according to the invention and according to a variant of the first embodiment.
• Figure 8 is a top view of part a wedging device according to the invention comprising a bracket for holding the bundle tubes.
• Figure 9 is an enlarged view of a detail of realization of the fixing of the stirrup of support shown in Figure 8.
• Envelope 2 contains the tube bundle of the steam generator made up of 5 tubes bent in U and comprising at their upper part semicircular hangers 5b constituting the bun of the generator steam.
• the straight parts 5a of the bundle tubes are crimped at their ends in the tube plate 3, so as to lead into a water box 7 in two parts separated by a partition 8.
• the tubular plate 3 is crossed by a regular network of holes in each of which is fixed one end of a bundle tube.
• the regular network of holes crossing the tubular plate 3 may for example be square mesh or triangular mesh.
• FIGS. 2A and 2B show a part of a wedging device according to the invention, in the case of a bundle of tubes fixed in holes of a square mesh network crossing the tube plate and in the case of a bundle of tubes held in holes forming a triangular mesh network crossing the tube plate 3, respectively.
• Reactor cooling water pressure nuclear enters one part of the box 7 through an inlet pipe 6a, circulates in the bundle tubes then exit through an outlet tube 6b.
• the bundle of tubes 5 is surrounded by an envelope of beam 9 making it possible to channel the supply water entering the envelope of the steam generator through a inlet manifold 11.
• Generator supply water steam first flows up and down in space annular 4 located around the envelope of the bundle 9, then from bottom to top in contact with the tubes 5 of the bundle, so as to heat up then vaporize and come out in the form of vapor through the upper tube 12 of the steam generator.
• the upper part of the tube bundle called bun is formed by the juxtaposition of hangers of semi-circular shape arranged in successive layers in which the radii of the hangers 5b are decreasing from the outside to the inside of the beam.
• the different successive layers of bundle tubes parallel to the central layer shown in Figure 1 have exterior hangers decreasing in diameter towards the outside, so that the upper part of the bundle or bun constitutes a substantially hemispherical in shape.
• the straight part 5a of the tubes 5 is maintained by spacer plates 10 which prevent the setting in tube vibrations when the steam generator is in service due to the circulation of fluids exchange.
• anti-vibration bars 15 formed as a V articulated or not at their inner ends 15a and introduced between successive layers of tubes at level of hangers.
• the outer ends 15b of the branches of the antivibration bars are protruding compared to the upper surface of the bun and allow the fixing the anti-vibration bars.
• FIGS. 2A and 2B there is shown in a top view with section of the plies of tubes in their upper part, part of a shimming assembly according to the invention, in the case of a bundle of tubes maintained in a square mesh network layout and in the case of a bundle of tubes held in a layout with triangular mesh network, respectively.
• the bundle tubes are held in a regular network layout through the openings in the tube plate 3 and through the through openings of the spacer plates 10 which have networks of openings analogues.
• the arrangement of the tubes in the case of a network triangular mesh results in particular in a lower space between successive layers of tubes than in the case of a square mesh network.
• the establishment of means of connection between the ends of the anti-vibration bars inserted between the plies of tubes is therefore more difficult, in the case of a triangular mesh network, because of the more low spacing between the layers and therefore between the anti-vibration bars slid between the layers of tubes.
• the device according to the invention is particularly well suited to the case of a network of tight mesh tubes triangular but it can of course be applied to case of a square mesh network.
• FIGS. 2A and 2B the corresponding elements bear the same references with the sign ' (prime) in the case of the elements in FIG. 2B relating to a triangular mesh network.
• the tubes 14 or 14 'of the network of tubes constituting the layers external parts of the steam generator bun are shown in FIGS. 2A and 2B.
• the tubes 14 or 14 ' constitute successive layers parallels 13 or 13 'between which are inserted 15 or 15 'anti-vibration bars.
• the layers of tubes consist of the curved upper parts of the juxtaposed tubes with decreasing radii from the outside towards the inside of the bun.
• the antivibration bars 15 include projecting ends 15b on the outside of the bun and arranged in alignment with each other to constitute variable length rows.
• the protruding ends 15b of the anti-vibration bars are interconnected by means of bond such as 16, 17, 18 and 19 respectively allowing liaise two, three, five or one greater number of anti-vibration bars constituting a set of aligned bars.
• the connecting devices such as 16, 17, 18 and 19 can be made from identical modular elements which will be described by the after.
• the end portions of the bars anti-vibration 15 'inserted between the plies of tubes arranged in a triangular mesh network as shown in Figure 2B can be connected by through connecting means such as 16 ', 17', 18 'and 19' to connect the ends together a set of two, four, five or more than five bars antivibration, respectively.
• connection device such as 16, 17, 18 and 19 or 16 ', 17 ', 18' and 19 'are crossed by aligned openings along an axis perpendicular to the ends of the anti-vibration bars.
• Such a device which will be designated in its together by the mark 20 in Figures 3 to 5 is similar to device 16 or 16 'shown in Figures 2A and 2B, respectively.
• the device 20 which ensures the connection between the end portions 25b and 25'b of two bars anti-vibration 25 and 25 'arranged in two successive spaces between rows of tubes 24 comprises a screw 21, a spacer 22 and a nut 23.
• the screw 21 has a head 21a secured to a threaded rod 21b.
• Spacer 22 has a threaded opening 22a and a threaded rod 22b arranged along the axis of the spacer, the rod 22b projecting from the end of the spacer 22 opposite its end on which opens the tapped opening 22a which is produced in the form of a blind hole.
• the threaded rod 21b of the screw 21 and the opening threaded 22a of the spacer 22 are made so that the rod 21b can be screwed into opening 21a.
• the rod 22b extending the spacer 22 in the axial direction has a thread identical to the thread of the rod 21b of the screw 21, which allows in certain embodiments which will be described more away, to fix the spacers 22 constituting elements modular in extension of one another.
• the connecting device 20 further comprises a nut 23 whose threaded opening allows screwing on the threaded rod 22b extending the spacer 22.
• the anti-vibration bars 25 and 25 ' are crossed by respective openings 26 and 26 ', the diameter is greater than the diameter of the rod 21b of the screw and rod 22b of the spacer which have, as indicated above, identical threads and diameters.
• the head 21a of the screw 21 has substantially the shape of a square whose side is longer than the width of a anti-vibration bar such as 25.
• the head 21a of the screw has on its face internal, a cavity 27 having two parallel edges and crossing the screw head over its entire length, the width is substantially equal to the width of a bar antivibration such as 25.
• screw head 21a could also have the shape of a circular disc in which would be machined the cavity 27 around the rod screws 21b.
• the spacer 22 has a body of a shape substantially cylindrical extended by the rod 22b which is coaxial with the cylindrical body of the spacer 22.
• the body of the spacer 22 has counterbores planes 22c and 22d on its external surface ( Figure 5) which ensure the grip of the spacer body with a tightening tool such as a wrench to make its screwing during assembly of the connecting device 20.
• the mounting of the connecting device 20 between the end parts 25b and 25'b of two anti-vibration bars 25 and 25 'located in intervals between successive rows of tubes 24 is produced during assembly of the steam generator harness, this assembly being generally produced by layers of successive tubes, the steam generator being placed in a layout where its axis is substantially horizontal.
• the anti-vibration bars are inserted between the plies of tubes which are arranged one on the others following a stack intended to constitute the beam.
• the screw head is oriented so that the cavity 27 is in the width direction of the anti-vibration bar 25 and engaged on the anti-vibration bar 25.
• the rod 21b of the screw 21 is introduced into the opening 26 of the bar anti-vibration 25.
• the spacer 22 is then introduced. between the end parts of the anti-vibration bars 25 and 25 ', the threaded rod 22b of the spacer 22 being engaged in the opening 26 'of the anti-vibration bar 25 '.
• the spacer 22 can be easily inserted between the anti-vibration bars 25 and 25 ', because the bar 25 is simply placed on the last layer of tubes deposited.
• the nut 23 is engaged on the end of the rod 22b of the spacer 22 for locking the the spacer.
• Locking in rotation of the connecting device 20 is completed by welding points 28 between the nut 23 and the end portion of the rod 22b of the spacer 22.
• the threaded parts 21b of the screw 21 and 22b of the spacer 22 has a length greater than the thickness anti-vibration bars 25 and 25 ', so that these threaded rods have parts protruding by relative to the crossing openings 26 and 26 'of the bars vibration dampers which are screwed into the spacer respectively 22 and through the nut 23.
• the threaded opening 22a of the spacer 22 has sufficient length to receive the rod the opinion.
• the thread pitches of rods 21b and 22b, of the threaded opening 22a and the threaded bore of the nut 23 are provided in directions allowing the tightening of the two rods inside the threaded openings.
• connection device via a screwed nut then welded to the end of the spacer rod.
• a second device has also been represented. 20 'of connection between a 25' 'anti-vibration bar and the bar 25 which includes a screw 21 'and a spacer 22' identical to screw 21 and to spacer 22 of the device 20.
• the device 20 'does not have a fixing nut 23, the spacer 22 'being screwed, by means of its rod 22'b, in a tapped opening 29 machined in the bar anti-vibration 25.
• the connecting device 20 ' is put in place then tightened in a single operation, by screwing the spacer 22 ', simultaneously in the tapped opening 29 and on the rod of the screw 21 'which engages in the opening threaded 22 'spacer.
• Such a device which is substantially equivalent to device 18 or 18 'shown in Figures 2A and 2B respectively will be designated as a whole by the mark 30.
• the connecting device 30 comprises a screw 31 substantially identical to the screw 21 of the device 20 which has been described above and four identical spacers 32a, 32b, 32c and 32d which are arranged one after the other the other in an alignment direction of the anti-vibration bars 35a, 35b, 35c, 35d and 35e according to which the anti-vibration bars are pierced with aligned openings.
• the threaded rod of the screw 31 is engaged in the opening of the first anti-vibration bar 35a and the screw head 31 is engaged on this anti-vibration bar, so as to be blocked in rotation.
• the first spacer 32a is screwed through of its threaded opening on the rod of the screw 31 and through the threaded rod which extends axially the spacer opposite the opening threaded and which is engaged in the opening of the bar anti-vibration 35b, in the threaded opening of the second spacer 32b.
• the second spacer 32b is itself screwed on the threaded rod of the first spacer 32a and at inside the tapped opening of the third spacer 32c.
• the last spacer 32d disposed between the anti-vibration bars 35d and 35e has a rod threaded through the last 35th anti-vibration bar and which has a projecting part on which is fixed a locking nut 33 which is tightened then fixed by solder points 36 on the threaded rod of the last spacer 32d.
• last spacer 32d could also be fixed by its threaded rod, to the inside of a threaded opening machined in the last 35e anti-vibration bar.
• the device 30 can have any number of identical spacers to make the connection between any number of anti-vibration bars of an assembly constituting a row aligned.
• the device 37 is constituted in the form of a stirrup which is generally designated by the term anti-theft stirrup, because its function is to avoid the ejection upwards of the anti-vibration bars.
• An anti-theft stirrup 37 is fixed by the end of one of its branches on a 32 'spacer of the device link 30 'arranged at the end of the row of anti-vibration bars.
• the bracket 37 can be attached to the end of its second branch, at its second end (not shown), on a spacer of a connection device identical to the device 30 'and ensuring the connection of the end parts a set of anti-vibration bars.
• the bracket 37 allows ensure the anti-theft hold of all the bars anti-vibration.
• the ends of the stirrup are fixed in two spacers of two connecting devices according to the invention of the ends 15'b of the anti-vibration bars 15 'introduced between the plies of tubes 14'.
• the spacer end 32 'of the connecting device 30' in which is fixed the branch of the stirrup 37 is extended by a fixing lug 38 of the stirrup 37 in which a curved end part of the stirrup is introduced and fixed by a weld 39.
• the device according to the invention therefore makes it possible to simple and efficient fixing of anti-theft stirrups of the anti-vibration bars, when assembly of the steam generator harness.
• the wedging device according to the invention comprising connecting devices constituted by identical screws and spacers therefore allows for quickly and easily linking any number anti-vibration bars when mounting the steam generator harness, using only modular elements with standard dimensions.
• the wedging device according to the invention also allows for efficient and simple fixing anti-theft stirrups anti-vibration bars.
• the invention is not limited to the embodiment that has been described.
• the invention applies in the case of any generator steam or heat exchanger having a regular network of tubes with curved parts between which are inserted anti-vibration bars.

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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)
• Supports For Pipes And Cables (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9452044

Family Applications (1)

Country Status (7)

Families Citing this family (13)

Family Cites Families (1)

• 1993
  • 1993-10-20 FR FR9312514A patent/FR2711419B1/fr not_active Expired - Fee Related
• 1994
  • 1994-10-06 DE DE69410215T patent/DE69410215T2/de not_active Expired - Fee Related
  • 1994-10-06 EP EP94402249A patent/EP0654636B1/fr not_active Expired - Lifetime
  • 1994-10-18 US US08/324,660 patent/US5514250A/en not_active Expired - Fee Related
  • 1994-10-19 CN CN94117179A patent/CN1076462C/zh not_active Expired - Fee Related
  • 1994-10-20 KR KR1019940026791A patent/KR100358820B1/ko not_active IP Right Cessation
  • 1994-11-05 TW TW083110301A patent/TW279233B/zh active

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