EP0027092B1 - Abstandshaltegitter für Rohrbündel - Google Patents

Abstandshaltegitter für Rohrbündel Download PDF

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Publication number
EP0027092B1
EP0027092B1 EP19800401438 EP80401438A EP0027092B1 EP 0027092 B1 EP0027092 B1 EP 0027092B1 EP 19800401438 EP19800401438 EP 19800401438 EP 80401438 A EP80401438 A EP 80401438A EP 0027092 B1 EP0027092 B1 EP 0027092B1
Authority
EP
European Patent Office
Prior art keywords
grooves
tubes
face
sheet
bars
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.)
Expired
Application number
EP19800401438
Other languages
English (en)
French (fr)
Other versions
EP0027092A1 (de
Inventor
Michel Batistoni
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0027092A1 publication Critical patent/EP0027092A1/de
Application granted granted Critical
Publication of EP0027092B1 publication Critical patent/EP0027092B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • F28F9/0135—Auxiliary supports for elements for tubes or tube-assemblies formed by grids having only one tube per closed grid opening

Definitions

  • the present invention relates to a spacer grid for tubular bundles, more particularly intended by way of example for tubular bundles of steam generators of nuclear power plants.
  • the steam generators of pressurized water nuclear power plants comprise a long, straight or U-shaped tubular bundle, traversed by the primary fluid coming from the reactor core, and bathed by the secondary fluid which enters in liquid form to exit in the form of steam after having taken a significant part of the calories from the primary fluid.
  • the tubes are generally held radially at several points by maintein and spacing grids.
  • the most conventional grids are constituted by a simple flat sheet metal pierced with holes, at the pitch of the bundle of tubes and of diameter slightly greater than the outside diameter of the latter, to take account of the inevitable misalignments during assembly of the generator.
  • These grids further comprise a mesh of additional orifices for the circulation of the secondary fluid; of course, an effort is made to keep sections sufficient to withstand the radial forces between the orifices, so that the fluid passage sections remain relatively small and restrict its circulation.
  • this solution facilitates the appearance of corrosion in the transition zones between the actual bearing zone of the tube on the spacer and the crescent zone where the clearance appears due to the differences in diameters.
  • the present invention allows the production of spacer grids of low manufacturing cost thanks to simple machining, without tight tolerances, and achievable on conventional machines, while ensuring good rigidity of the assembly, good support of the tubes and a large section. secondary fluid passage.
  • the spacer grid is constituted by a flat sheet having on each face a series of parallel grooves, of different direction for each face, with depths of grooves, respectively relative to each face, such that their sum is greater than l sheet thickness, the number, the pitch and the width of the grooves being determined as a function of the corresponding characteristics of the tube bundle.
  • Figure 1 shows the angle of a thick sheet machined according to the invention to form a spacer grid. It is to facilitate the drawing and the description that a part of a rectangular sheet has been shown here, but of course, in particular for use in a steam generator, the outline of the sheet before machining will be more often circular.
  • the sheet 1 On its upper face the sheet 1 is here hollowed out by a series of parallel grooves 2 with a U-shaped profile. On the lower face it is also hollowed out by a series of parallel grooves 3 with inverted U profile, the directions of the grooves 2 and 3 being perpendicular.
  • the depths of grooves 2 and 3 are here greater than the half-thickness of the sheet metal, so that there is interpenetration of the grooves and appearance of lights at their intersections. If, as here, the grooves 2 and 3 are equidistant, of the same width and perpendicular, a regular network of orifices 5 is obtained, the profile of which is square when the sheet is viewed perpendicularly to one or other of its faces.
  • the sheet thus perforated remains a single piece, therefore particularly rigid, and is presented as the superposition with offset of two crossed networks of parallel bars 7 and 8, rigidly joined by connecting parts 9.
  • the two series of grooves can be made on entirely conventional machine tools such as planers or milling machines, and with completely standard tools, that is to say under very economical conditions of production.
  • the passage sections between bars on the lower and upper faces of the spacer only depend on the characteristics of the tubes, that is to say on their pitch and their diameter; on the other hand the passage section inside the spacer depends on the relative values of the groove depths and the thickness of the raw sheet, so that the choice of these various parameters will depend on the residual section that is will want to leave the bars 7 and 8, that is to say the importance of the radial forces that we want to make them bear.
  • FIG. 8 schematically illustrates an embodiment, for a triangular mesh of the tubes, where the two series of grooves instead of being perpendicular are inclined at 60 °; the tube passage orifices then have, seen from above, a diamond shape.

Claims (1)

  1. Zwischenrost für das Rohrbündel eines Wärmetauschers zum Halten der Rohre (11) in Querrichtung, wobei der Umlauf des die Rohre aussen umspülenden Mediums in senkrechter Richtung möglich ist, dadurch gekennzeichnet, dass dieser Rost aus einem ebenen Blech (1) mit auf jeder Seite einer Reihe paralleler Nuten (2, 3) besteht, die auf jeder Seite in anderer Richtung verlaufen und auf jeder Seite jeweils solche Nutentiefen (2, 3) aufweisen, dass die Summe dieser Tiefen grösser ist als die Blechdicke (1), wobei Anzahl, Abstand und Breite der Nuten (2, 3) je nach den entsprechenden Daten des Rohrbündels bestimmt werden.
EP19800401438 1979-10-08 1980-10-08 Abstandshaltegitter für Rohrbündel Expired EP0027092B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7924984 1979-10-08
FR7924984A FR2467371A1 (fr) 1979-10-08 1979-10-08 Grille entretoise pour faisceaux tubulaires

Publications (2)

Publication Number Publication Date
EP0027092A1 EP0027092A1 (de) 1981-04-15
EP0027092B1 true EP0027092B1 (de) 1982-03-24

Family

ID=9230436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800401438 Expired EP0027092B1 (de) 1979-10-08 1980-10-08 Abstandshaltegitter für Rohrbündel

Country Status (3)

Country Link
EP (1) EP0027092B1 (de)
DE (1) DE3060251D1 (de)
FR (1) FR2467371A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003067170A1 (en) * 2002-02-05 2003-08-14 Shell Internationale Research Maatschappij B.V. Tube bundle
WO2005015107A1 (en) 2003-08-06 2005-02-17 Shell Internationale Research Maatschappij B.V. Support for a tube bundle

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE788031A (fr) * 1971-08-27 1973-02-26 Babcock & Wilcox Co Perfectionnements aux echangeurs de chaleur et a leur fabrication
US3820594A (en) * 1972-12-15 1974-06-28 Westinghouse Electric Corp Tube support system for heat exchanger
US4143709A (en) * 1977-03-15 1979-03-13 Westinghouse Electric Corp. Tube support system

Also Published As

Publication number Publication date
FR2467371B1 (de) 1981-10-16
EP0027092A1 (de) 1981-04-15
FR2467371A1 (fr) 1981-04-17
DE3060251D1 (en) 1982-04-29

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