EP0077268B1 - Heat exchanger with helically coiled tubes - Google Patents

Heat exchanger with helically coiled tubes Download PDF

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Publication number
EP0077268B1
EP0077268B1 EP19820401846 EP82401846A EP0077268B1 EP 0077268 B1 EP0077268 B1 EP 0077268B1 EP 19820401846 EP19820401846 EP 19820401846 EP 82401846 A EP82401846 A EP 82401846A EP 0077268 B1 EP0077268 B1 EP 0077268B1
Authority
EP
European Patent Office
Prior art keywords
bundle
head
heat exchanger
faces
wedge
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
EP19820401846
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German (de)
French (fr)
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EP0077268A1 (en
Inventor
Paul Landet
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.)
Creusot Loire SA
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Creusot Loire SA
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Publication date
Application filed by Creusot Loire SA filed Critical Creusot Loire SA
Publication of EP0077268A1 publication Critical patent/EP0077268A1/en
Application granted granted Critical
Publication of EP0077268B1 publication Critical patent/EP0077268B1/en
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

Definitions

  • the present invention relates to a heat exchanger composed of bundles of helical windings of tubes, such as a steam generator with convection bundles.
  • the subject of the present invention is a device for bracing and supporting the helical windings of tubes of a heat exchanger which effectively ensures radial and longitudinal immobilization in an inexpensive manner and with great ease of implementation.
  • the exchanger according to the invention comprises at least one bundle constituted by at least one helical winding of tube, and it is characterized in that it comprises a plurality of shims which are each constituted by a rod having two bearing faces parallel separated by a thickness corresponding to the spacing between two neighboring turns of said bundle so as to be inserted between said turns and by a flared head forming a wedge, said head being welded to said turns.
  • the head forms two planar and divergent faces. These faces are formed on two branches, the wedge having the shape of a Y.
  • the exchanger comprises bracing bars which are mounted longitudinally in each annular space separating two bundles nested one inside the other.
  • Figure 1 is an elevational view of a portion of the exchanger according to the invention.
  • FIG. 2 is a longitudinal section, along II-II, of the exchanger of FIG. 1.
  • the exchanger according to the invention consists of an enclosure, not shown, in which a heat-carrying gas circulates and inside which are housed bundles 1, 2 of tubes which are bathed by the gas and which channel a fluid such as water vapor.
  • the drawings show only two partially represented beams but the number of beams can be greater.
  • Each bundle 1 or 2 is composed of several helical windings 11 or 21 of tubes having the same mean winding cylinder.
  • Each winding 11 or 21 is formed of a tube 111 or 211 wound helically on the winding cylinder 12 or 22 with a sufficient pitch so that at least one intermediate winding can be accommodated between the turns of said winding.
  • the helical windings of the same mean diameter of a bundle are nested one inside the other.
  • the helices of the windings of the same winding cylinder have the same direction and their pitch is identical.
  • the bundles 1 and 2 are nested one inside the other so that the respective winding cylinders 12 and 22 of different diameters have the same axis 7.
  • Two neighboring bundles such as 1 and 2 can be made up of windings whose helices have opposite meanings. If the inner bundle 1 consists of windings whose propellers are on the right, the outer bundle 2 then consists of windings whose propellers are on the left and vice versa.
  • the exchanger comprises a plurality of shims 4 which are each inserted between two adjacent tubular turns of the same bundle.
  • each wedge 4 is therefore inserted between two turns of two helical windings.
  • Each wedge is constituted by a rod 41 having two flat and parallel faces 411 separated by a thickness which corresponds to the spacing between two neighboring turns of the same beam.
  • the bearing faces 411 are in contact with the generatrices of the two neighboring turns at minimum spacing.
  • the rod 41 is connected to a flared head 42 forming a corner.
  • This head provides two support faces 421 which are planar and symmetrical with respect to the median plane of symmetry of the rod extending parallel to the faces 411 and at equal distance from the latter. These bearing faces 421 which diverge from the rod 41 act as abutments for implementation, and are applied against the generators of two neighboring turns. This head is oriented towards the outside of the winding because the positioning of the wedge takes place from the outside.
  • the two bearing faces 421 are formed on the outer faces of two branches formed by a V-notch, these branches being symmetrical with respect to the median plane of the rod defined above.
  • the wedge thus has a Y shape.
  • the flared head 42 of the wedge has two flats 422 which are welded to the two neighboring turns, by two weld beads 5, the spacing of the two beads being greater than the thickness of the wedge .
  • the exchanger has, parallel to the longitudinal axis 7, at least one alignment of shims 4 each inserted between two neighboring turns.
  • the exchanger has three alignments of this type so that over 360 ° - that is to say that for a current interval between two turns - there are three shims marked 4.
  • the exchanger has, in each annular space between two neighboring bundles, a set of spacer bars 6. These bars are mounted longitudinally in this space to facilitate winding and ensure the relative positioning of the two neighboring bundles. These bars can support the beams.
  • Each bundle 1 or 2 could consist of a single helical tube winding.

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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)

Description

La présente invention se rapporte à un échangeur de chaleur composé de faisceaux d'enroulements hélicoïdaux de tubes, tel qu'un générateur de vapeur à faisceaux de convection.The present invention relates to a heat exchanger composed of bundles of helical windings of tubes, such as a steam generator with convection bundles.

On connaît des échangeurs constitués par plusieurs faisceaux composés chacun d'enroulements de tubes enroulés, en hélices, sur des cylindres d'enroulement coaxiaux, ces faisceaux étant emboîtés les uns dans les autres. Les solutions connues pour réaliser l'entretoisement des spires et le supportage présentent des inconvénients.Exchangers are known which consist of several bundles each made up of windings of tubes wound in helices on coaxial winding cylinders, these bundles being nested one inside the other. The known solutions for making the bracing of the turns and the support have drawbacks.

La présente invention a pour objet un dispositif d'entretoisement et de supportage des enroulements hélicoïdaux de tubes d'un échangeur de chaleur qui assure de manière efficace une immobilisation radiale et longitudinale de manière peu onéreuse et avec une grande facilité de mise en oeuvre.The subject of the present invention is a device for bracing and supporting the helical windings of tubes of a heat exchanger which effectively ensures radial and longitudinal immobilization in an inexpensive manner and with great ease of implementation.

L'échangeur selon l'invention comporte au moins un faisceau constitué par au moins un enroulement hélicoïdal de tube, et il est caractérisé par le fait qu'il comporte une pluralité de cales qui sont constituées chacune par une tige présentant deux faces d'appui parallèles séparées par une épaisseur correspondant à l'écartement entre deux spires voisines dudit faisceau de manière à être insérée entre lesdites spires et par une tête évasée formant coin, ladite tête étant soudée auxdites spires.The exchanger according to the invention comprises at least one bundle constituted by at least one helical winding of tube, and it is characterized in that it comprises a plurality of shims which are each constituted by a rod having two bearing faces parallel separated by a thickness corresponding to the spacing between two neighboring turns of said bundle so as to be inserted between said turns and by a flared head forming a wedge, said head being welded to said turns.

Selon une caractéristique de l'invention, la tête forme deux faces planes et divergentes. Ces faces sont ménagées sur deux branches, la cale ayant la forme d'un Y.According to a characteristic of the invention, the head forms two planar and divergent faces. These faces are formed on two branches, the wedge having the shape of a Y.

Selon une autre caractéristique de l'invention, l'échangeur comprend des barres d'entretoisement qui sont montées longitudinalement dans chaque espace annulaire séparant deux faisceaux emboîtés les uns dans les autres.According to another characteristic of the invention, the exchanger comprises bracing bars which are mounted longitudinally in each annular space separating two bundles nested one inside the other.

L'invention va maintenant être décrite avec plus de détails en se référant à un mode de réalisation donné à titre d'exemple et représenté par les dessins annexés.The invention will now be described in more detail with reference to an embodiment given by way of example and represented by the accompanying drawings.

La figure 1 est une vue en élévation d'une portion de l'échangeur selon l'invention.Figure 1 is an elevational view of a portion of the exchanger according to the invention.

La figure 2 est une coupe longitudinale, selon II-II, de l'échangeur de la figure 1.FIG. 2 is a longitudinal section, along II-II, of the exchanger of FIG. 1.

L'échangeur selon l'invention se compose d'une enceinte non réprésentée dans laquelle circule un gaz caloporteur et à l'intérieur de laquelle sont logés des faisceaux 1, 2 de tubes qui sont baignés par le gaz et qui canalisent un fluide tel que la vapeur d'eau. Les dessins ne montrent que deux faisceaux partiellement représentés mais le nombre de faisceaux peut être plus grand. Chaque faisceau 1 ou 2 est composé de plusieurs enroulements hélicoïdaux 11 ou 21 de tubes ayant le même cylindre d'enroulement moyen. Chaque enroulement 11 ou 21 est formé d'un tube 111 ou 211 enroulé hélicoïdalement sur le cylindre d'enroulement 12 ou 22 avec un pas suffisant pour qu'au moins un enroulement intermédiaire puisse être logé entre les spires dudit enroulement. Ainsi les enroulements hélicoïdaux de même diamètre moyen d'un faisceau sont imbriqués les uns dans les autres. Pour permettre cette conception, les hélices des enroulements de même cylindre d'enroulement ont le même sens et leurs pas sont identiques. Les faisceaux 1 et 2 sont emboîtés les uns dans les autres de manière que les cylindres d'enroulements respectifs 12 et 22 de diamètres différents aient le même axe 7. Deux faisceaux voisins tels que 1 et 2 peuvent être constitués d'enroulements dont les hélices ont des sens inverses. Si le faisceau intérieur 1 est constitué d'enroulements dont les hélices sont à droite, le faisceau extérieur 2 est alors constitué d'enroulements dont les hélices sont à gauche et inversement.The exchanger according to the invention consists of an enclosure, not shown, in which a heat-carrying gas circulates and inside which are housed bundles 1, 2 of tubes which are bathed by the gas and which channel a fluid such as water vapor. The drawings show only two partially represented beams but the number of beams can be greater. Each bundle 1 or 2 is composed of several helical windings 11 or 21 of tubes having the same mean winding cylinder. Each winding 11 or 21 is formed of a tube 111 or 211 wound helically on the winding cylinder 12 or 22 with a sufficient pitch so that at least one intermediate winding can be accommodated between the turns of said winding. Thus the helical windings of the same mean diameter of a bundle are nested one inside the other. To allow this design, the helices of the windings of the same winding cylinder have the same direction and their pitch is identical. The bundles 1 and 2 are nested one inside the other so that the respective winding cylinders 12 and 22 of different diameters have the same axis 7. Two neighboring bundles such as 1 and 2 can be made up of windings whose helices have opposite meanings. If the inner bundle 1 consists of windings whose propellers are on the right, the outer bundle 2 then consists of windings whose propellers are on the left and vice versa.

L'échangeur comporte une pluralité de cales 4 qui sont insérées chacune entre deux spires tubulaires voisines d'un même faisceau. Dans le mode de réalisation décrit ci-dessus, chaque cale 4 est donc insérée entre deux spires de deux enroulements hélicoïdaux. Chaque cale est constituée par une tige 41 présentant deux faces planes et parallèles 411 séparées par une épaisseur qui correspond à l'écartement entre deux spires voisines d'un même faisceau. Lorsque la tige de la cale est inserée entre les deux spires voisines, les faces d'appui 411 sont au contact des génératrices des deux spires voisines à l'écartement minimum. Dans chaque cale la tige 41 se raccorde à une tête évasée 42 formant coin. Cette tête ménage deux faces d'appui 421 qui sont planes et symétriques par rapport au plan médian de symétrie de la tige s'étendant parallèlement aux faces 411 et à égale distance de celles-ci. Ces faces d'appui 421 qui divergent à partir de la tige 41 font office de butées à la mise en place, et s'appliquent contre les génératrices de deux spires voisines. Cette tête est orientée vers l'extérieur de l'enroulement du fait que la mise en place de la cale s'effectue de l'extérieur. Les deux faces d'appui 421 sont ménagées sur les faces extérieures de deux branches formées par une entaille en V, ces branches étant symétriques par rapport au plan médian de la tige défini ci-dessus. La cale a ainsi une forme en Y. La tête évasée 42 de la cale comporte deux méplats 422 qui sont soudés aux deux spires voisines, par deux cordons de soudure 5, l'écartement des deux cordons étant supérieur à l'épaisseur de la cale.The exchanger comprises a plurality of shims 4 which are each inserted between two adjacent tubular turns of the same bundle. In the embodiment described above, each wedge 4 is therefore inserted between two turns of two helical windings. Each wedge is constituted by a rod 41 having two flat and parallel faces 411 separated by a thickness which corresponds to the spacing between two neighboring turns of the same beam. When the wedge rod is inserted between the two neighboring turns, the bearing faces 411 are in contact with the generatrices of the two neighboring turns at minimum spacing. In each wedge the rod 41 is connected to a flared head 42 forming a corner. This head provides two support faces 421 which are planar and symmetrical with respect to the median plane of symmetry of the rod extending parallel to the faces 411 and at equal distance from the latter. These bearing faces 421 which diverge from the rod 41 act as abutments for implementation, and are applied against the generators of two neighboring turns. This head is oriented towards the outside of the winding because the positioning of the wedge takes place from the outside. The two bearing faces 421 are formed on the outer faces of two branches formed by a V-notch, these branches being symmetrical with respect to the median plane of the rod defined above. The wedge thus has a Y shape. The flared head 42 of the wedge has two flats 422 which are welded to the two neighboring turns, by two weld beads 5, the spacing of the two beads being greater than the thickness of the wedge .

De préférence, l'échangeur présente parallèlement à l'axe longitudinal 7, au moins un alignement de cales 4 inserées chacune entre deux spires voisines. De préférence l'échangeur présente trois alignements de ce type de manière que sur 360° - c'est-à-dire que pour un intervalle courant entre deux spires - il y ait trois cales repérées 4.Preferably, the exchanger has, parallel to the longitudinal axis 7, at least one alignment of shims 4 each inserted between two neighboring turns. Preferably, the exchanger has three alignments of this type so that over 360 ° - that is to say that for a current interval between two turns - there are three shims marked 4.

L'échangeur présente, dans chaque espace annulaire compris entre deux faisceaux voisins, un jeu de barres d'entretoisement 6. Ces barres sont montées longitudinalement dans cet espace pour faciliter l'enroulement et assurer le positionnement relatif des deux faisceaux voisins. Ces barres peuvent supporter les faisceaux.The exchanger has, in each annular space between two neighboring bundles, a set of spacer bars 6. These bars are mounted longitudinally in this space to facilitate winding and ensure the relative positioning of the two neighboring bundles. These bars can support the beams.

Chaque faisceau 1 ou 2 pourrait être constitué d'un seul enroulement hélicoïdal de tube.Each bundle 1 or 2 could consist of a single helical tube winding.

Claims (4)

1. A heat exchanger comprising at least one bundle (1, 2) formed by at least on helical tube coil, characterised in that it comprises a plurality of wedges (4) each consisting of a stem (41) having two parallel bearing faces (411) separated by a thickness (e) corresponding to the spacing between two neighbouring whorls of the said bundle so as to be inserted between the said whorls, and of a flared head (42) forming a chock, the said head being welded to the said whorls.
2. An exchanger according to Claim 1, characterised in that the head (42) forms two planar and divergent faces (421).
3. An exchanger according to Claim 2, characterised in that the planar and divergent faces (421) are arranged on two branches, the wedge being Y-shaped.
4. An exchanger according to any one of the preceding claims, characterised in that it comprises spacer bars (6) which are fitted longitudinally in each annular space separating two bundles (1, 2) encased in each other.
EP19820401846 1981-10-09 1982-10-08 Heat exchanger with helically coiled tubes Expired EP0077268B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8119063 1981-10-09
FR8119063A FR2514481A1 (en) 1981-10-09 1981-10-09 HEAT EXCHANGER WITH TUBE HELICOIDAL WINDINGS

Publications (2)

Publication Number Publication Date
EP0077268A1 EP0077268A1 (en) 1983-04-20
EP0077268B1 true EP0077268B1 (en) 1984-05-09

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EP19820401846 Expired EP0077268B1 (en) 1981-10-09 1982-10-08 Heat exchanger with helically coiled tubes

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EP (1) EP0077268B1 (en)
DE (1) DE3260146D1 (en)
FR (1) FR2514481A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8716522D0 (en) * 1987-07-14 1987-08-19 Hick Hargreaves & Co Ltd Securing tie

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR807020A (en) * 1935-06-12 1936-12-31 Cie Gen De Constr De Fours Tight and elastic connection device for tubes forming the walls of tubular boilers or other devices
BE559078A (en) * 1956-07-10
DE2921406A1 (en) * 1979-05-26 1980-12-04 Deggendorfer Werft Eisenbau Tube grid for heat exchanger - consists of rectangles formed by short bridging channels between deeper parallel strips

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DE3260146D1 (en) 1984-06-14
FR2514481B1 (en) 1983-12-02
EP0077268A1 (en) 1983-04-20
FR2514481A1 (en) 1983-04-15

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