EP0078208B1 - Dispositif de fixation d'un faisceau de tubes notamment pour générateur de vapeur - Google Patents

Dispositif de fixation d'un faisceau de tubes notamment pour générateur de vapeur Download PDF

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Publication number
EP0078208B1
EP0078208B1 EP82401940A EP82401940A EP0078208B1 EP 0078208 B1 EP0078208 B1 EP 0078208B1 EP 82401940 A EP82401940 A EP 82401940A EP 82401940 A EP82401940 A EP 82401940A EP 0078208 B1 EP0078208 B1 EP 0078208B1
Authority
EP
European Patent Office
Prior art keywords
tube
fixing
rod
tubes
fixing element
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
EP82401940A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0078208A1 (fr
Inventor
Yves Fournier
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Novatome SA
Commissariat a lEnergie Atomique CEA
Creusot Loire 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9263347&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0078208(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Novatome SA, Commissariat a lEnergie Atomique CEA, Creusot Loire SA filed Critical Novatome SA
Publication of EP0078208A1 publication Critical patent/EP0078208A1/fr
Application granted granted Critical
Publication of EP0078208B1 publication Critical patent/EP0078208B1/fr
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
    • F28F9/0132—Auxiliary supports for elements for tubes or tube-assemblies formed by slats, tie-rods, articulated or expandable rods

Definitions

  • the present invention relates to a device for fixing a bundle of tubes wound in a vertical helix according to several coaxial cylindrical layers.
  • the invention is particularly applicable to the bundle of tubes of a steam generator.
  • the device for fixing the tubes must also allow a certain flexibility of the assembly of the tubes so that the expansions and the vibrations which can occur in these tubes do not cause abnormally high stresses.
  • the known devices for fixing a bundle of tubes have the drawbacks mentioned above mainly when the bundle of tubes constitutes the secondary circuit of a sodium-water type steam generator.
  • the use of hot liquid sodium as a heat transfer fluid has the particularity of subjecting the structure of the steam generator to extremely violent thermal shocks due to the exceptionally high thermal conductivity of the liquid sodium.
  • the tubular bundle which constitutes the water-vapor circuit is thus subjected to dilations which can vary very suddenly over time as well as to differences in expansion between the various elements which constitute it.
  • the bundle of tubes can also be subjected to vibrations due to the high-speed circulation of the liquid sodium around the tubes and of the water vapor inside the tubes.
  • the fastening devices take on a very great importance and are difficult to carry out because of the multiple and almost contradictory functions which they must fulfill, namely the precise positioning of the tubes, the damping of their vibrations, while allowing their expansion in several directions and avoiding excessive matting and wear.
  • the present invention aims to overcome the drawbacks mentioned above.
  • the devices for fixing the tubes make only one connection which is approximately of the "ball joint" type.
  • the tube is required to keep a fixed position in space at the location of each fixing device, but it can have a certain rotational movement around this point. Consequently, the natural frequency of a portion of tube situated between two successive fixing devices is relatively low.
  • the excitation frequency which mainly results from the flow of sodium around the tube is relatively low, it is advantageous to fix the tube so that its natural frequency is as high as possible.
  • the present invention therefore aims, on the other hand, to create a tube fixing device which is such that the natural frequency of the tube is as high as possible.
  • the present invention therefore relates to a device for fixing a bundle of tubes wound in a helix in several coaxial cylindrical layers, comprising longitudinal rods provided with cylindrical notches intended to receive each portion of tube corresponding to the same cylindrical layer, said rods being thus arranged between each layer of tubes so as to form several flat radial plies, elements for fixing the tubes on these rods being interposed between two consecutive rods of the same flat radial ply, each fixing element essentially comprising a part capable to style two turns notched consecutively in the corresponding rod, the contact between the device and the corresponding tube being made on zones of the point quays tube.
  • each tube is held in the fastening device according to three point contact zones, two zones separated by a certain distance being located on the face of the tube towards the center of the beam, the third zone being diametrically opposite to the other two zones and situated in a middle position.
  • the fixing device re-embeds the tube, which gives a more rigid connection than the connection »ro tule ", which increases the natural frequency of the tube.
  • said screw intended to create the force for tracing the tube rests on the fixing element by a ball-type connection.
  • the cylindrical notches formed in the rod and in the fixing element have a radius of curvature slightly greater than that of the tubes.
  • fig. 4 which is a view along a radial plane of a steam generator, there is a set of tubes 3 arranged in two coaxial cylindrical layers 1.
  • This fig. 4 is only a partial view, the entire bundle of tubes 3 is actually formed of a plurality of coaxial cylindrical layers extending over a certain length, in known manner.
  • the tube fixing device is mainly composed of rods 4, 5, 6 arranged longitudinally, between each cylindrical layer of tubes, and constituting, in the whole of the cylindrical bundle, several flat and radial plies.
  • the tubes 3 are each arranged in a corresponding cylindrical notch of the different rods 4, 5, 6.
  • fastening elements 7, 8, 9 also comprising notches intended to come to adapt on the tubes, are arranged on the other side of the corresponding rods and assembled to them by an appropriate clamping means.
  • the fastening elements 7, 8, 9 on the other hand have on their face opposite to the face which rests on the tubes 3 a form of longitudinal female slide in which the rods 4, 5, 6 are positioned corresponding to the next cylindrical layer. In this way, all of the rods 4, 5, 6 form a rigid radial flat sheet since each rod is linked to the previous and to the next by means of the interposed fastening elements.
  • This general arrangement of the device for fixing a bundle of tubes is known per se.
  • the present invention does not reside in this general arrangement but resides in an improvement to this fixing device which makes the latter particularly reliable and effective.
  • FIGs. 1, 2 and 3 we will see in detail an exemplary embodiment which includes the improvements which are the subject of the present invention.
  • a means tightening 11 causes the force F which tends to bring the parts 8 and 4.
  • the tightening element here consists of a screw 11 whose head has a base 12 of spherical shape with radius R1 which comes to rest on a corresponding conical surface 13 of the fixing element 8. In this way, the screw 11 exerts on the fixing element 8 a force F which remains constant in intensity and in direction whatever the exact position occupied by the element fixing 8 and screw 11; the fixing element 8 thus behaves like a lifter which distributes the force F equally over the two turns of the tube 3.
  • the fastening element 8 has an exact position in the space which is imposed by the position of the rod 5 in which it is engaged, and the screw 11 must not itself impose a precise position to the fixing element 8 since this fixing element has its position imposed by the rod 5.
  • the connection of the ball-joint type 12 of the screw 11 with the fixing element 8 satisfies this condition and consequently establishes an assembly which is isostatic.
  • the attachment of the tubes 3 is only reliable if it is known in advance how to determine the exact position of the points of contact of the tube with its support elements.
  • the contact bridges between the tube and its support elements have been chosen diametrically opposite 14, 15, which is the most rational arrangement.
  • the bearing surfaces of the parts 4 and 8 with the tube 3 come into contact with the tube tangentially. In this way, the stress at the contact of the tube 3 decreases progressively between the center of the contact surface 14 or 15 and its periphery.
  • the rod 4 of the notches 16 of cylindrical shape intended to receive the tube 3 these notches 16 having a radius R2 slightly greater than the radius R of the tube 3, and on the other hand the notches formed on the fastening element 8 consist of flat surfaces 17 at the point of contact 14 on which are joined laterally, tangentially concave cylindrical surfaces 18, 19, of on both sides, and of radius R3 slightly greater than the radius R of the tube 3.
  • the centers of radii of curvature of the faces 18 and 19 are spaced by a distance d equal to the width d of the planar surface 17.
  • the planar surfaces 17 lie in a plane which is parallel to the longitudinal axis of the tube bundle.
  • Another aspect of the invention resides in the position of the contact points 14 and 15 relative to a longitudinal direction of the tube 3, which is visible in particular in FIG. 3.
  • the tube fixing device in a section B-B.
  • the tube 3 is wound in the bundle and the radius of curvature R4 of this winding is very large.
  • the contact zone between the tube 3 and the fastening element 8 is not established on a generator of the surface 17 but on a central point platform area 14, and on the other hand, for the same reason, the contact zone between the tube 3 and the notch 16 of the rod 4 is not established on a generator but on two almost point zones 15 of the lateral parts of the rod 4.
  • each tube 3 is held in a fixing device according to three point contact zones 14-15, two zones 15 separated by a certain distance "e" being located on the face of the tube 3 towards the center of the beam, and the zone 14 being diametrically opposite to the zones 15 and situated in a central position.
  • this arrangement creates recessed support, increasing the natural bending frequencies of the tubes. Tests show that this device increases the natural frequency of the tube by approximately 20, which consequently increases the damping factor by approximately 50%, compared to a fixing device creating a support at two points which creates a type of connection. »Ball joint «.
  • we. may be provided to immobilize the clamping screws after the final mounting, for it may be provided on this screw notches periph- eral 21, and the workpiece 8, a cylin- dri q ue portion 22 deformable in the vicinity of the periphery of the screw head, this part 22 being intended to be matted in order to become embedded in the notches 21 of the head of the screw.
  • the invention can also be applied to any installation other than steam generators, in which a bundle of helically wound tubes must be fixed in good condition.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supports For Pipes And Cables (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
EP82401940A 1981-10-23 1982-10-22 Dispositif de fixation d'un faisceau de tubes notamment pour générateur de vapeur Expired EP0078208B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119981 1981-10-23
FR8119981A FR2515331A1 (fr) 1981-10-23 1981-10-23 Dispositif de fixation d'un faisceau de tubes notamment pour generateur de vapeur

Publications (2)

Publication Number Publication Date
EP0078208A1 EP0078208A1 (fr) 1983-05-04
EP0078208B1 true EP0078208B1 (fr) 1984-08-29

Family

ID=9263347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401940A Expired EP0078208B1 (fr) 1981-10-23 1982-10-22 Dispositif de fixation d'un faisceau de tubes notamment pour générateur de vapeur

Country Status (5)

Country Link
US (1) US4756278A (enExample)
EP (1) EP0078208B1 (enExample)
JP (1) JPS58160704A (enExample)
DE (1) DE3260636D1 (enExample)
FR (1) FR2515331A1 (enExample)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555722B1 (fr) * 1983-11-25 1988-07-29 Stein Industrie Dispositif de suspension d'un faisceau de tubes horizontaux dans un plan vertical, et procede de fabrication de ce dispositif
US4665866A (en) * 1985-09-04 1987-05-19 Westinghouse Electric Corp. Grid-type flow distribution baffle
FR2637970B1 (fr) * 1988-10-18 1990-11-23 Stein Industrie Dispositif de suspension de tubes horizontaux d'echange de chaleur sur un tube porteur vertical et procede de fabrication de ce dispositif
GB8916375D0 (en) * 1989-07-18 1989-09-06 Radders Limited Heat exchangers
FR2652639A1 (fr) * 1989-10-02 1991-04-05 Clark Maurice Elements magnetiques anti-vibratoires pour tubes de faisceaux tubulaires d'echangeurs de chaleur.
US5012767A (en) * 1989-10-03 1991-05-07 Leighton Industries, Inc. Heat exchanger tube spacers
US5154139A (en) * 1990-05-14 1992-10-13 Norton Company Refractory tube block
US5136985A (en) * 1991-09-12 1992-08-11 Deltak Corporation Boiler tube support
US5762032A (en) * 1996-12-23 1998-06-09 Combustion Engineering, Inc. Field adjustable boltless stirrup
EP0895028B1 (de) * 1997-07-28 2002-03-06 Alstom Keramische Auskleidung
KR20040041082A (ko) * 2000-07-24 2004-05-13 비브콤 인코포레이티드 멀티미디어 북마크와 비디오의 가상 편집을 위한 시스템및 방법
DE10036211A1 (de) * 2000-07-25 2002-02-07 Rolls Royce Deutschland Brennkammerschindel
US7089887B1 (en) * 2005-07-01 2006-08-15 Mcclure Mark W Water wall fit up tool

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2121348B1 (enExample) * 1971-01-05 1974-02-15 Babcock Atlantique Sa
US4010796A (en) * 1971-11-26 1977-03-08 Reactor Centrum Nederland Lattice, composed of strips with connecting brackets positioned in between
FR2162251B1 (enExample) * 1971-12-07 1975-08-29 Babcock Atlantique Sa
US3838665A (en) * 1972-06-19 1974-10-01 Goetaverken Angteknik Ab Furnace wall containing spaced, parallel water tubes and blocks mounted thereon
GB1404643A (en) * 1972-09-23 1975-09-03 Clarke Chapman Ltd Heat exchanger
JPS5118100A (en) * 1974-08-02 1976-02-13 Otani Fumyoshi Parashuutonyoru kokahohonarabinisochi
FR2304048A1 (fr) * 1975-03-12 1976-10-08 Commissariat Energie Atomique Support de faisceaux tubulaires
JPS5240061A (en) * 1975-09-26 1977-03-28 Hitachi Ltd Semiconductor device and process for production of same
FR2336621A1 (fr) * 1975-12-22 1977-07-22 Fives Cail Babcock Support de tubes, notamment pour echangeur de chaleur
DE2613745A1 (de) * 1976-03-31 1977-10-06 Linde Ag Waermetauscher
FR2473697A1 (fr) * 1980-01-11 1981-07-17 Stein Industrie Dispositif d'accrochage d'un panneau de tubes d'echange de chaleur
US4337827A (en) * 1980-10-01 1982-07-06 The Babcock & Wilcox Company Helical steam generator tube support

Also Published As

Publication number Publication date
US4756278A (en) 1988-07-12
FR2515331B1 (enExample) 1983-12-02
FR2515331A1 (fr) 1983-04-29
JPS58160704A (ja) 1983-09-24
EP0078208A1 (fr) 1983-05-04
DE3260636D1 (en) 1984-10-04

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