EP1777481B1 - Separation grid for separating cleaning particles from a carrier fluid of a heat exchanger - Google Patents

Separation grid for separating cleaning particles from a carrier fluid of a heat exchanger Download PDF

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Publication number
EP1777481B1
EP1777481B1 EP06291622A EP06291622A EP1777481B1 EP 1777481 B1 EP1777481 B1 EP 1777481B1 EP 06291622 A EP06291622 A EP 06291622A EP 06291622 A EP06291622 A EP 06291622A EP 1777481 B1 EP1777481 B1 EP 1777481B1
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EP
European Patent Office
Prior art keywords
grid
longitudinal members
axis
spacers
longitudinal
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EP06291622A
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German (de)
French (fr)
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EP1777481A1 (en
Inventor
Damien Thivent
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Technos et Cie
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Technos et Cie
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
    • F28G1/00—Non-rotary, e.g. reciprocated, appliances
    • F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies

Definitions

  • the invention relates to the cleaning of heat exchangers (in particular of the tubular or plate type).
  • a tubular heat exchanger comprises, in a conventional manner, a plurality of tubes in which circulates a heat transfer fluid. To ensure the cleaning of the tubes, it is done, usually occasionally and repeatedly, circulate in the tubes, within the fluid, the cleaning bodies which pickle the inner walls of the tubes to prevent their fouling by the deposition of impurities conveyed by the fluid. These bodies - with a diameter slightly greater than the internal diameter of the tubes - are collected downstream of the heat exchanger and then reinjected upstream.
  • one or more separation grids which, while allowing the fluid to pass through, retain the cleaning bodies and guide them towards a recycling device.
  • This grid which comprises a plurality of longitudinal reinforcements (called side members) interconnected by cross members (having a spacer function) and mounted on a pivot axis, is assembled at the factory, then mounted in a block within the led, the assembly then being mounted in the heat exchanger.
  • Such a design requires replacing the duct / grid assembly (s), or at least the grids when they are worn, damaged or, in any case, when their operation is no longer satisfactory.
  • This replacement requires heavy intervention. It is necessary to proceed to the removal of the conduit and, possibly, pipes located upstream and downstream thereof. But the imposing dimensions of the duct require the use of a crane or any other type of mechanical lift. We must then proceed with the replacement, either of the conduit as a whole, or at least of the grid as a whole before reassembling the whole.
  • the invention aims to simplify the maintenance of heat exchangers by proposing a grid whose design makes it easy to repair or replace it, as well as mounting on an existing duct devoid of separation grid.
  • the subject of the invention is also a method for mounting such a separation grid in a discharge duct of a heat exchanger, according to which the grid is brought into spare parts in the duct and then assembled into the duct. of it, by mounting the longitudinal members on the axis and then fixing the spacers to the longitudinal members.
  • FIG. 1 there is shown a discharge pipe 1 for a heat exchanger (not shown but whose general structure is for example in accordance with the patent application French FR 2 634 672 in the name of the plaintiff).
  • This pipe 1, tubular, is disposed downstream of the heat exchanger; it is traversed by a coolant such as water, which carries spherical cleaning bodies (called “balls”) ensuring the stripping the pipes of the heat exchanger.
  • a coolant such as water
  • the balls are separated from the fluid by a filtration device 2 which comprises at least one filtering grid 3 mounted obliquely in the duct 1. More precisely, in accordance with the embodiment illustrated in the figures, the filtration device 2 comprises two grids 3 vis-à-vis mounted obliquely in the conduit 1 to jointly form a funnel separating the balls of the fluid and the guide to a recycling device (not shown) which reinjects the balls upstream of the heat exchanger.
  • Each grid 3 comprises a plurality of equidistant parallel beams 4, mounted on a common pivot axis 5, perpendicular to the longitudinal members 4 and rotatably mounted by each of its ends 6, 7, in two bearings 8 formed by substantially diametrically opposed holes practiced. in the wall of the duct 1.
  • the spars 4 are in the form of metal blades (made, in practice, stainless steel) which have a rectilinear upstream edge 9, and a curved downstream edge 10, bulged at the passage of the axis 5. Between two longitudinal members 4 adjacent is mounted a filter element (not shown) reported, which has a series of lamellae whose spacing is less than the diameter of the balls.
  • a person skilled in the art can refer to the patent application French N ° FR 2 815 548 , supra, in the name of the plaintiff.
  • Each spar 4 has an inner end 11, located near a vertical plane of symmetry of the duct 1, and an opposite outer end 12 located in the vicinity of the wall of the duct 1.
  • the longitudinal members 4 are not of equal length: in view of the oblique arrangement of the grid 3, the outer ends 12 are distributed substantially over a elliptical contour, the central beams 4 being longer than the side members 4.
  • the longitudinal members 4 are mounted on the axis by means of removable fastening means.
  • each spar 4 is provided with a cylindrical sleeve 13 which protrudes from both sides at the bulge of the spar 4.
  • This sleeve 13 is pierced with two pairs of diametrically coaxial holes 14, 15 opposite, whose axis is parallel to the plane of the spar 4 and perpendicular to the upstream edge 9 thereof.
  • the axis 5 which is in the form of a cylindrical bar, comprises a series of conical diametrical holes 16 placed opposite each of the pairs of holes 14, 15.
  • a threaded conical pin 17 is introduced together in each piercing. 16 and in each corresponding pair of holes 14, 15, so as to ensure the rigid attachment, constant spacing, the longitudinal members 4 on the axis 5.
  • On each pin 17 is screwed a nut 18 which ensures the clamping.
  • the grid 3 comprises a plurality of spacers 19 mounted between the longitudinal members 4.
  • Each spacer 19 is in the form of a flat piece which has a central portion 20 extending between two adjacent longitudinal members 4, extended on either side by two end portions 21, 22 resting against the longitudinal members 4. As can be seen in particular on the figure 6 the spacers 19 are arranged in alignment with each other. Two sets of spacers 19 are provided, on either side of the axis 5: a first series on the side of the outer ends 12 of the longitudinal members 4, a second on the side of their inner ends 11.
  • the spacers 19 are preferably inclined relative to the longitudinal members, so that each series of spacers has a V-shaped profile which turns its concavity towards the axis 5. This arrangement provides a better rigidity of the grid at the central spars 4, where the fluid flow (and thus the impact force of the balls) is maximum.
  • the spacers 19 are mounted on the longitudinal members4 by means of removable fastening means. More specifically, the spacers are bolted to the longitudinal members 4. Their end portions 21, 22 are pierced with holes 23 placed opposite corresponding holes 24 formed in the longitudinal members 4. A same bolt 25 (shown on the figure 5 by its axis in dash) performs the joint fixing of two spacers 19 on either side of the same spar 4, crossing the holes 23, 24 in the end portions 21, 22 and in the spar 4 together. .
  • the grid 3 further comprises a peripheral frame 26, mounted on the longitudinal members 4 by removable fastening means (in this case by bolts 27).
  • the frame 26 has a generally U-shaped shape and comprises two opposite lateral flanges 28, each fixed together with the three longitudinal members 4 closest to each end 6, 7 of the axis 5, the lateral flanges 28 being connected by a flange. end 29 inclined relative to the plane in which extend the upstream edges 9 of the longitudinal members 4, and fixed at the same time to the lateral flanges 28 and the central spars 4.
  • Each side edge 28 has, along the spar 4 located at the end of the axis (side spar), a cross section at right angles and comprises an upper panel 30, which extends in the plane of the upstream edges 9 of the side members 4 (this plane being parallel to the axis 5), and a lower panel 31, perpendicular to the axis 5 and by which the flange 28 is fixed to the side spar 4.
  • the lower flange 31 stops at the outer end 12 of the side spar 4, while the upper flange 30 extends in an arc to the end flange 29.
  • the brackets 32 welded to the upper panel 30 and bolted to the two adjacent side members 4 of the side spar 4, complete the removable attachment of the lateral flange 28 to the longitudinal members 4.
  • brackets 32 The attachment of the end flange 29 to the longitudinal members 4 is provided by brackets 32, welded to the flange 29 and bolted to the central spars 4. To complete this attachment, the positioning of the end flange 29 with respect to the lateral flanges 28 may be provided by means of a pair of brackets 33 welded or glued to the end flange 29 or to the side flanges 28.
  • the components of the grid 3 are fixed to each other removably, which allows to mount in situ the grid 3 in a duct 1 already in place in a heat exchanger . It is also possible to proceed to its subsequent replacement by a similar grid, without the need to remove the conduit 1. Similarly, it is possible to replace a defective part (for example a 4), remove the grid 3, replace the part, then reassemble the grid 3. This results in substantial gains in cost and maintenance time.
  • a defective part for example a 4
  • the grid 3 is brought into spare parts in the duct 2, then it is assembled within it, by mounting the longitudinal members 4 on the axis 5 and then fixing the spacers 19 to the longitudinal members 4, and finally by fixing the frame 26 (side edges 28 and end edge 29) to the longitudinal members 4. More specifically, the longitudinal members 4 are introduced one by one in the conduit 1 by a manhole 34, and mounted successively on the axis 5, itself gradually introduced into the conduit 1 by one of its bearings 8.
  • the mounting of the spacers 4 is preferably performed after the stacking and fixing (by means of the pins) of the longitudinal members 4 on axis 5 are completed. The order of assembly is provided for information only. For example, the assembly of the spacers 19 and that of the frame 26 may be reversed.

Abstract

The grid has a set of longerons (4) each having an inner end (11) placed near a symmetric vertical plane of an exhaust duct and an outer end (12) placed near a wall of the duct. The longerons are fixed to a common pivot pin (5) in a removable manner, where the pivot pin is perpendicular to the longerons. A set of crosspieces (19) is fixed to the longerons via bolts in a removable manner. The cross pieces are inclined with respect to the longerons so that each crosspiece has a V profile which turns its concavity towards the pin. An independent claim is also included for a method of assembling a screening grid.

Description

L'invention a trait au nettoyage des échangeurs thermiques (notamment de types tubulaires ou à plaques).The invention relates to the cleaning of heat exchangers (in particular of the tubular or plate type).

Un échangeur thermique tubulaire comprend, de manière classique, une pluralité de tubes dans lesquels circule un fluide caloporteur. Pour assurer le nettoyage des tubes, on fait, généralement de manière occasionnelle et répétée, circuler dans les tubes, au sein du fluide, des corps nettoyants qui décapent les parois internes des tubes pour éviter leur encrassement par le dépôt d'impuretés véhiculées par le fluide. Ces corps - d'un diamètre légèrement supérieur au diamètre interne des tubes - sont collectés en aval de l'échangeur thermique, puis réinjectés en amont.A tubular heat exchanger comprises, in a conventional manner, a plurality of tubes in which circulates a heat transfer fluid. To ensure the cleaning of the tubes, it is done, usually occasionally and repeatedly, circulate in the tubes, within the fluid, the cleaning bodies which pickle the inner walls of the tubes to prevent their fouling by the deposition of impurities conveyed by the fluid. These bodies - with a diameter slightly greater than the internal diameter of the tubes - are collected downstream of the heat exchanger and then reinjected upstream.

Afin de procéder à cette collecte, on dispose en aval de l'échangeur thermique, au sein d'un conduit d'évacuation, une ou plusieurs grilles de séparation qui, tout en laissant passer le fluide, retiennent les corps nettoyants et les guident vers un dispositif de recyclage.In order to carry out this collection, downstream of the heat exchanger, within a drainage duct, is provided one or more separation grids which, while allowing the fluid to pass through, retain the cleaning bodies and guide them towards a recycling device.

Une telle grille de séparation est connue de la demande de brevet français publiée sous le numéro FR 2 815 548 au nom de la demanderesse.Such a separation grid is known from the French patent application published under the number FR 2 815 548 in the name of the plaintiff.

Cette grille, qui comprend une pluralité d'armatures longitudinales (appelées longerons) reliées entre elles par des traverses (ayant une fonction d'entretoise) et montés sur un axe pivot, est assemblée en usine, puis montée d'un bloc au sein du conduit, l'ensemble étant ensuite monté dans l'échangeur thermique.This grid, which comprises a plurality of longitudinal reinforcements (called side members) interconnected by cross members (having a spacer function) and mounted on a pivot axis, is assembled at the factory, then mounted in a block within the led, the assembly then being mounted in the heat exchanger.

Une telle conception impose de remplacer l'ensemble conduit/grille(s), ou tout du moins les grilles lorsque celles-ci sont usées, endommagées ou, en tout cas, lorsque leur fonctionnement n'est plus satisfaisant. Ce remplacement nécessite une intervention lourde. Il est nécessaire de procéder à la dépose du conduit et, éventuellement, des canalisations situées en amont et en aval de celui-ci. Or les dimensions imposantes du conduit nécessitent l'utilisation d'une grue ou tout autre type d'élévateur mécanique. On doit ensuite procéder au remplacement, soit du conduit dans son ensemble, soit, au moins, de la grille dans son ensemble avant de remonter le tout.Such a design requires replacing the duct / grid assembly (s), or at least the grids when they are worn, damaged or, in any case, when their operation is no longer satisfactory. This replacement requires heavy intervention. It is necessary to proceed to the removal of the conduit and, possibly, pipes located upstream and downstream thereof. But the imposing dimensions of the duct require the use of a crane or any other type of mechanical lift. We must then proceed with the replacement, either of the conduit as a whole, or at least of the grid as a whole before reassembling the whole.

L'invention vise à simplifier la maintenance des échangeurs thermiques en proposant une grille dont la conception permette d'en faciliter la réparation ou le remplacement, ainsi que le montage sur un conduit existant dépourvu de grille de séparation.The invention aims to simplify the maintenance of heat exchangers by proposing a grid whose design makes it easy to repair or replace it, as well as mounting on an existing duct devoid of separation grid.

A cet effet, l'invention propose une grille de séparation pour séparer d'un fluide porteur des corps nettoyants provenant d'un échangeur thermique, cette grille comprenant :

  • une pluralité de longerons parallèles équidistants, montés sur un axe pivot commun perpendiculaire aux longerons, et
  • une pluralité d'entretoises montées entre les longerons,
grille dans laquelle les longerons sont fixés à l'arbre de manière amovible, et les entretoises sont fixées aux longerons de manière amovible.For this purpose, the invention proposes a separation grid for separating a cleaning fluid from a heat exchanger coming from a heat exchanger, this grid comprising:
  • a plurality of equidistant parallel spars, mounted on a common pivot axis perpendicular to the spars, and
  • a plurality of spacers mounted between the longitudinal members,
grid in which the rails are removably attached to the shaft, and the spacers are attached to the rails removably.

De la sorte, il est possible d'assembler la grille in situ, c'est-à-dire au sein même du conduit d'évacuation de l'échangeur thermique, sans qu'il soit nécessaire de procéder à la dépose de celui-ci.In this way, it is possible to assemble the gate in situ, that is to say within the same duct evacuation of the heat exchanger, without it being necessary to proceed with the removal of this- this.

L'invention a aussi pour objet un procédé de montage d'une telle grille de séparation dans un conduit d'évacuation d'un échangeur thermique, suivant lequel on amène en pièces détachées la grille dans le conduit, puis on l'assemble au sein de celui-ci, en montant les longerons sur l'axe puis en fixant les entretoises aux longerons.The subject of the invention is also a method for mounting such a separation grid in a discharge duct of a heat exchanger, according to which the grid is brought into spare parts in the duct and then assembled into the duct. of it, by mounting the longitudinal members on the axis and then fixing the spacers to the longitudinal members.

D'autres objets et avantages de l'invention apparaîtront à la lumière de la description faite ci-après en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue d'élévation en perspective montrant un conduit d'évacuation d'un échangeur thermique, équipé de grilles de séparation conformes à l'invention ;
  • la figure 2 est une vue en plan de dessus du conduit de la figure 1 ;
  • la figure 3 est une vue d'élévation en coupe du conduit d'évacuation des figures 1 et 2, suivant le plan de coupe III-III de la figure 2;
  • la figure 4 est une vue en perspective montrant une grille de séparation conforme à l'invention ;
  • la figure 5 est une vue d'un détail de la grille de séparation de la figure 4 ;
  • la figure 6 est une vue en plan de la grille de séparation de la figure 4 ;
  • la figure 7 est une vue de côté de la grille de séparation de la figure 6 ;
  • la figure 8 est une vue en coupe de la grille de séparation de la figure 7, suivant le plan de coupe VIII-VIII ;
  • la figure 9 est une vue en coupe de la grille de séparation de la figure 6, suivant le plan de coupe IX-IX ;
  • et la figure 10 est une vue d'un détail de la grille de séparation de la figure 9.
Other objects and advantages of the invention will become apparent in the light of the description given below. with reference to the accompanying drawings in which:
  • the figure 1 is a perspective elevation view showing a discharge pipe of a heat exchanger, equipped with separation grids according to the invention;
  • the figure 2 is a top plan view of the duct of the figure 1 ;
  • the figure 3 is a sectional elevational view of the exhaust duct of the figures 1 and 2 according to section III-III of the figure 2 ;
  • the figure 4 is a perspective view showing a separation grid according to the invention;
  • the figure 5 is a view of a detail of the separation grid of the figure 4 ;
  • the figure 6 is a plan view of the separation grid of the figure 4 ;
  • the figure 7 is a side view of the separation grid of the figure 6 ;
  • the figure 8 is a sectional view of the separation grid of the figure 7 following section VIII-VIII;
  • the figure 9 is a sectional view of the separation grid of the figure 6 along the IX-IX section plane;
  • and the figure 10 is a view of a detail of the separation grid of the figure 9 .

Sur la figure 1 est représenté un conduit 1 d'évacuation pour un échangeur thermique (non représenté mais dont la structure générale est par exemple conforme à la demande de brevet français FR 2 634 672 au nom de la demanderesse).On the figure 1 there is shown a discharge pipe 1 for a heat exchanger (not shown but whose general structure is for example in accordance with the patent application French FR 2 634 672 in the name of the plaintiff).

Ce conduit 1, tubulaire, est disposé en aval de l'échangeur thermique ; il est parcouru par un fluide caloporteur tel que de l'eau, qui charrie des corps nettoyants sphériques (appelées « boules ») assurant le décapage des canalisations de l'échangeur thermique.This pipe 1, tubular, is disposed downstream of the heat exchanger; it is traversed by a coolant such as water, which carries spherical cleaning bodies (called "balls") ensuring the stripping the pipes of the heat exchanger.

Les boules sont séparées du fluide par un dispositif 2 de filtration qui comprend au moins une grille 3 de filtration montée de manière oblique dans le conduit 1. Plus précisément, conformément au mode de réalisation illustré sur les figures, le dispositif 2 de filtration comprend deux grilles 3 en vis-à-vis montées de manière oblique dans le conduit 1 pour former conjointement un entonnoir séparant les boules du fluide et les guide vers un dispositif de recyclage (non représenté) qui réinjecte les boules en amont de l'échangeur thermique.The balls are separated from the fluid by a filtration device 2 which comprises at least one filtering grid 3 mounted obliquely in the duct 1. More precisely, in accordance with the embodiment illustrated in the figures, the filtration device 2 comprises two grids 3 vis-à-vis mounted obliquely in the conduit 1 to jointly form a funnel separating the balls of the fluid and the guide to a recycling device (not shown) which reinjects the balls upstream of the heat exchanger.

Chaque grille 3 comprend une pluralité de longerons 4 parallèles équidistants, montés sur un axe pivot 5 commun, perpendiculaire aux longerons 4 et monté en rotation, par chacune de ses extrémités 6, 7, dans deux paliers 8 formés par des trous sensiblement diamétralement opposés pratiqués dans la paroi du conduit 1.Each grid 3 comprises a plurality of equidistant parallel beams 4, mounted on a common pivot axis 5, perpendicular to the longitudinal members 4 and rotatably mounted by each of its ends 6, 7, in two bearings 8 formed by substantially diametrically opposed holes practiced. in the wall of the duct 1.

Les longerons 4 se présentent sous la forme de lames métalliques (réalisées, en pratique, en acier inoxydable) qui présentent un bord amont 9 rectiligne, et un bord aval 10 courbe, renflé au niveau du passage de l'axe 5. Entre deux longerons 4 adjacents est monté un élément de filtration (non représenté) rapporté, qui présente une série de lamelles dont l'écartement est inférieur au diamètre des boules. Pour la réalisation et le montage des éléments de filtration, l'homme du métier pourra se reporter à la demande de brevet français N° FR 2 815 548 , précitée, au nom de la demanderesse.The spars 4 are in the form of metal blades (made, in practice, stainless steel) which have a rectilinear upstream edge 9, and a curved downstream edge 10, bulged at the passage of the axis 5. Between two longitudinal members 4 adjacent is mounted a filter element (not shown) reported, which has a series of lamellae whose spacing is less than the diameter of the balls. For the production and assembly of filtration elements, a person skilled in the art can refer to the patent application French N ° FR 2 815 548 , supra, in the name of the plaintiff.

Chaque longeron 4 présente une extrémité interne 11, localisée au voisinage d'un plan vertical de symétrie du conduit 1, et une extrémité externe 12 opposée, localisée au voisinage de la paroi du conduit 1.Each spar 4 has an inner end 11, located near a vertical plane of symmetry of the duct 1, and an opposite outer end 12 located in the vicinity of the wall of the duct 1.

Les longerons 4 ne sont pas de longueurs égales : compte tenu de la disposition oblique de la grille 3, les extrémités externes 12 sont réparties sensiblement sur un contour elliptique, les longerons 4 centraux étant plus longs que les longerons 4 latéraux.The longitudinal members 4 are not of equal length: in view of the oblique arrangement of the grid 3, the outer ends 12 are distributed substantially over a elliptical contour, the central beams 4 being longer than the side members 4.

Les longerons 4 sont montés sur l'axe à l'aide de moyens de fixation amovible.The longitudinal members 4 are mounted on the axis by means of removable fastening means.

Plus précisément, chaque longeron 4 est muni d'une douille 13 cylindrique qui s'étend en saillie de part et d'autre, au niveau du renflement du longeron 4. Cette douille 13 est percée de deux paires de trous 14, 15 coaxiaux diamétralement opposés, dont l'axe est parallèle au plan du longeron 4 et perpendiculaire au bord amont 9 de celui-ci.More specifically, each spar 4 is provided with a cylindrical sleeve 13 which protrudes from both sides at the bulge of the spar 4. This sleeve 13 is pierced with two pairs of diametrically coaxial holes 14, 15 opposite, whose axis is parallel to the plane of the spar 4 and perpendicular to the upstream edge 9 thereof.

L'axe 5, qui se présente sous la forme d'un barreau cylindrique, comprend une série de perçages 16 diamétraux coniques, placés en regard de chacune des paires de trous 14, 15. Une goupille 17 conique filetée est introduite conjointement dans chaque perçage 16 et dans chaque paire correspondante de trous 14, 15, de manière à assurer la fixation rigide, à écartement constant, des longerons 4 sur l'axe 5. Sur chaque goupille 17 est vissée un écrou 18 qui en assure le serrage.The axis 5, which is in the form of a cylindrical bar, comprises a series of conical diametrical holes 16 placed opposite each of the pairs of holes 14, 15. A threaded conical pin 17 is introduced together in each piercing. 16 and in each corresponding pair of holes 14, 15, so as to ensure the rigid attachment, constant spacing, the longitudinal members 4 on the axis 5. On each pin 17 is screwed a nut 18 which ensures the clamping.

Par ailleurs, à des fins de rigidification et pour maintenir constant l'écartement entre les longerons 4, la grille 3 comprend une pluralité d'entretoises 19 montées entre les longerons 4.Furthermore, for purposes of stiffening and to maintain constant spacing between the longitudinal members 4, the grid 3 comprises a plurality of spacers 19 mounted between the longitudinal members 4.

Chaque entretoise 19 se présente sous la forme d'une pièce plate qui présente un portion centrale 20 s'étendant entre deux longerons 4 adjacents, prolongée de part et d'autre par deux portions d'extrémité 21, 22 en appui contre les longerons 4. Comme cela est visible notamment sur la figure 6, les entretoises 19 sont disposées dans l'alignement les unes des autres. Deux séries d'entretoises 19 sont prévues, de part et d'autre de l'axe 5 : une première série du côté des extrémités externes 12 des longerons 4, une seconde du côté de leurs extrémités internes 11. Les entretoises 19 sont de préférence inclinées par rapport aux longerons, de sorte que chaque série d'entretoises présente un profil en V qui tourne sa concavité vers l'axe 5. Cette disposition permet d'obtenir une meilleure rigidité de la grille au niveau des longerons 4 centraux, où le débit de fluide (et donc la force d'impact des boules) est maximum.Each spacer 19 is in the form of a flat piece which has a central portion 20 extending between two adjacent longitudinal members 4, extended on either side by two end portions 21, 22 resting against the longitudinal members 4. As can be seen in particular on the figure 6 the spacers 19 are arranged in alignment with each other. Two sets of spacers 19 are provided, on either side of the axis 5: a first series on the side of the outer ends 12 of the longitudinal members 4, a second on the side of their inner ends 11. The spacers 19 are preferably inclined relative to the longitudinal members, so that each series of spacers has a V-shaped profile which turns its concavity towards the axis 5. This arrangement provides a better rigidity of the grid at the central spars 4, where the fluid flow (and thus the impact force of the balls) is maximum.

Les entretoises 19 sont montées sur les longerons4 à l'aide de moyens de fixation amovible. Plus précisément, les entretoises sont boulonnées sur les longerons 4. Leurs portions d'extrémités 21, 22 sont percées de trous 23 placés en regard de trous 24 correspondants pratiqués dans les longerons 4. Un même boulon 25 (matérialisé sur la figure 5 par son axe en trait mixte) réalise la fixation conjointe de deux entretoises 19 de part et d'autre d'un même longeron 4, en traversant conjointement les trous 23, 24 dans les portions d'extrémité 21, 22 et dans le longeron 4.The spacers 19 are mounted on the longitudinal members4 by means of removable fastening means. More specifically, the spacers are bolted to the longitudinal members 4. Their end portions 21, 22 are pierced with holes 23 placed opposite corresponding holes 24 formed in the longitudinal members 4. A same bolt 25 (shown on the figure 5 by its axis in dash) performs the joint fixing of two spacers 19 on either side of the same spar 4, crossing the holes 23, 24 in the end portions 21, 22 and in the spar 4 together. .

Comme cela est visible notamment sur les figures 4 et 6, la grille 3 comprend en outre un cadre 26 périphérique, monté sur les longerons 4 par des moyens de fixation amovible (en l'occurrence par des boulons 27).As can be seen in particular on figures 4 and 6 , the grid 3 further comprises a peripheral frame 26, mounted on the longitudinal members 4 by removable fastening means (in this case by bolts 27).

Le cadre 26 présente une forme générale en U et comprend deux rebords latéraux 28 opposés, chacun fixé conjointement aux trois longerons 4 les plus proches de chaque extrémité 6, 7 de l'axe 5, les rebords latéraux 28 étant reliés par un rebord d'extrémité 29 incliné par rapport au plan dans lequel s'étendent les bords amont 9 des longerons 4, et fixé à la fois aux rebords latéraux 28 et aux longerons centraux 4.The frame 26 has a generally U-shaped shape and comprises two opposite lateral flanges 28, each fixed together with the three longitudinal members 4 closest to each end 6, 7 of the axis 5, the lateral flanges 28 being connected by a flange. end 29 inclined relative to the plane in which extend the upstream edges 9 of the longitudinal members 4, and fixed at the same time to the lateral flanges 28 and the central spars 4.

Chaque rebord latéral 28 présente, le long du longeron 4 situé à l'extrémité de l'axe (longeron latéral), une section transversale en équerre et comprend un pan supérieur 30, qui s'étend dans le plan des bords amont 9 des longerons 4 (ce plan étant parallèle à l'axe 5), et un pan inférieur 31, perpendiculaire à l'axe 5 et par lequel le rebord 28 est fixé au longeron latéral 4. Le pan inférieur 31 s'interrompt au niveau de l'extrémité externe 12 du longeron latéral 4, tandis que le pan supérieur 30 se prolonge en arc jusqu'au rebord d'extrémité 29. Des équerres 32, soudées au pan supérieur 30 et boulonnées aux deux longerons 4 voisins du longeron latéral 4, complètent la fixation amovible du rebord latéral 28 aux longerons 4.Each side edge 28 has, along the spar 4 located at the end of the axis (side spar), a cross section at right angles and comprises an upper panel 30, which extends in the plane of the upstream edges 9 of the side members 4 (this plane being parallel to the axis 5), and a lower panel 31, perpendicular to the axis 5 and by which the flange 28 is fixed to the side spar 4. The lower flange 31 stops at the outer end 12 of the side spar 4, while the upper flange 30 extends in an arc to the end flange 29. The brackets 32, welded to the upper panel 30 and bolted to the two adjacent side members 4 of the side spar 4, complete the removable attachment of the lateral flange 28 to the longitudinal members 4.

La fixation du rebord d'extrémité 29 aux longerons 4 est assurée par des équerres 32, soudées au rebord 29 et boulonnées aux longerons centraux 4. Pour compléter cette fixation, le positionnement du rebord d'extrémité 29 par rapport aux rebords latéraux 28 peut être assurée au moyen d'une paire d'étriers 33 soudés ou collés sur le rebord d'extrémité 29 ou sur les rebords latéraux 28.The attachment of the end flange 29 to the longitudinal members 4 is provided by brackets 32, welded to the flange 29 and bolted to the central spars 4. To complete this attachment, the positioning of the end flange 29 with respect to the lateral flanges 28 may be provided by means of a pair of brackets 33 welded or glued to the end flange 29 or to the side flanges 28.

Comme nous l'avons vu, les composants de la grille 3 sont fixés les uns aux autres de manière amovible, ce qui permet de monter in situ la grille 3 dans un conduit 1 d'évacuation déjà en place au sein d'un échangeur thermique. Il est également possible de procéder à son remplacement ultérieur par une grille semblable, sans qu'il soit nécessaire de procéder à la dépose du conduit 1. De même, il est possible, pour procéder au remplacement d'une pièce défectueuse (par exemple un longeron 4), de démonter la grille 3, remplacer la pièce, puis remonter la grille 3. Il en résulte des gains substantiels de coût et de temps de maintenance.As we have seen, the components of the grid 3 are fixed to each other removably, which allows to mount in situ the grid 3 in a duct 1 already in place in a heat exchanger . It is also possible to proceed to its subsequent replacement by a similar grid, without the need to remove the conduit 1. Similarly, it is possible to replace a defective part (for example a 4), remove the grid 3, replace the part, then reassemble the grid 3. This results in substantial gains in cost and maintenance time.

Pour réaliser le montage de la grille 3 dans le conduit 1, on procède comme suit. On amène en pièces détachées la grille 3 dans le conduit 2, puis on l'assemble au sein de celui-ci, en montant les longerons 4 sur l'axe 5 puis en fixant les entretoises 19 aux longerons 4, et enfin en fixant le cadre 26 (bords latéraux 28 puis bord d'extrémité 29) aux longerons 4. Plus précisément, les longerons 4 sont introduits un par un dans le conduit 1 par un trou d'homme 34, et montés successivement sur l'axe 5, lui même introduit progressivement dans le conduit 1 par l'un de ses paliers 8. Le montage des entretoises 4 est réalisé de préférence après que l'empilement et la fixation (au moyen des goupilles) des longerons 4 sur l'axe 5 sont achevés. L'ordre de montage est fourni à titre indicatif. On pourra par exemple intervertir le montage des entretoises 19 et celui du cadre 26.To mount the gate 3 in the conduit 1, proceed as follows. The grid 3 is brought into spare parts in the duct 2, then it is assembled within it, by mounting the longitudinal members 4 on the axis 5 and then fixing the spacers 19 to the longitudinal members 4, and finally by fixing the frame 26 (side edges 28 and end edge 29) to the longitudinal members 4. More specifically, the longitudinal members 4 are introduced one by one in the conduit 1 by a manhole 34, and mounted successively on the axis 5, itself gradually introduced into the conduit 1 by one of its bearings 8. The mounting of the spacers 4 is preferably performed after the stacking and fixing (by means of the pins) of the longitudinal members 4 on axis 5 are completed. The order of assembly is provided for information only. For example, the assembly of the spacers 19 and that of the frame 26 may be reversed.

Claims (13)

  1. Fitter grid (3) for separating cleaning particles from a carrier fluid of a heal exchanger, this grid (3) comprising a plurality of equidistant parallel longitudinal members (4), mounted on a common pivot axis (5) perpendicular to the longitudinal members (4), and a plurality of spacers (19) mounted between the longitudinal members (4), this grid (3) being characterised in that the longitudinal members (4) are removably fixed to the axis (5) and in that the spacers (19) arc removably fixed to the longitudinal members (4).
  2. Grid (3) according to claim 1, characterised in that each longitudinal member (4) is provided with a bushing (13) which is attached to it and which is traversed by the pivot axis (5), and in that removable means of fastening (17) of the longitudinal member (4) to the axis (5) are adapted to rigidly fix said bushing (13) to the axis (5).
  3. Grid (3) according to claim 2, characterised in that said removable means of fastening include a pin (17) which passes through two diametrically opposite holes (14, 15) made in said bushing (13), and further passes through a diametrical bore hole (16) made in the axis (5) across from said holes (14, 15).
  4. Grid (3) according to one of claims 1 to 3, characterised in that the spacers (19) are fixed to the longitudinal members (4) by means of bolts.
  5. Grid (3) according to claim 4, characterised in that each spacer (19) has the form of a flat part which has a central portion (20) extending between two adjacent longitudinal members (4), extended on either side by two end portions (21, 22) pressing against the longitudinal members (4), and pierced with holes (23) for the passing of the bolts.
  6. Grid (3) according to claim 4 or 5, characterised in that the same bolt carries out the conjoint fastening of two spacers (19) on either side of the same longitudinal member (4).
  7. Grid (3) according to one of claims 1 to 6, characterised in that it further comprises a periphery frame (26), removably mounted on the longitudinal members (4).
  8. Grid (3) according to claim 7, characterised in that the frame (26) is fixed to the longitudinal members (4) by the intermediary of bolts.
  9. Grid (3) according to claim 8, characterised in that the frame (26) has, at least locally, a transversal section at a right angle and comprises an upper face (30), which extends in a plane parallel to the axis (5), and a lower face (31), perpendicular to the axis (5) and by which the frame (26) is fixed to a longitudinal member (4).
  10. Grid (3) according to claim 7, characterised in that the frame (26) has the general shape of a U and comprises two opposite lateral edges (28) which are substantially parallel to the longitudinal members (4), connected by a terminal edge (29) which is substantially perpendicular to the longitudinal members (4).
  11. Device (2) for separating cleaning particles from a carrier fluid of a heat exchanger, this device comprising a pipe (1) and, mounted in a slanted manner in the latter, it least one grid according to one of claims 1 to 10.
  12. Method of mounting a grid according to one of claims 1 to 10 in a discharge pipe (1) of a heat exchanger, according to which the grid is brought as a spare part in the pipe, then it is assembled within the latter, by mounting the longitudinal members on the axis then by fixing the spacers to the longitudinal members.
  13. Method of mounting according to claim 12, for a grid according to one of clams 2 to 10, according to which the axis (5) is introduced progressively into the pipe (1) by one of two bearings (8) formed by substantially diametrically opposite holes made in the wall of the pipe, in order to pass through each longitudinal member.
EP06291622A 2005-10-19 2006-10-18 Separation grid for separating cleaning particles from a carrier fluid of a heat exchanger Not-in-force EP1777481B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0510669A FR2892186B1 (en) 2005-10-19 2005-10-19 SEPARATING GRID FOR SEPARATING FROM A CARRIER FLUID CLEANING BODIES FROM A HEAT EXCHANGER.

Publications (2)

Publication Number Publication Date
EP1777481A1 EP1777481A1 (en) 2007-04-25
EP1777481B1 true EP1777481B1 (en) 2010-02-24

Family

ID=36636941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06291622A Not-in-force EP1777481B1 (en) 2005-10-19 2006-10-18 Separation grid for separating cleaning particles from a carrier fluid of a heat exchanger

Country Status (5)

Country Link
EP (1) EP1777481B1 (en)
AT (1) ATE458980T1 (en)
DE (1) DE602006012413D1 (en)
ES (1) ES2340312T3 (en)
FR (1) FR2892186B1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1832518A (en) * 1927-10-26 1931-11-17 William L Wettlaufer Shaking screen
US3042206A (en) * 1959-12-15 1962-07-03 Hewitt Robins Inc Screen deck
US5816412A (en) * 1996-04-02 1998-10-06 Western Wire Works, Inc. Screening systems and methods for screening particulate material
US6267246B1 (en) * 2000-02-14 2001-07-31 Western Wire Works, Inc. Screening system for screening or diverting particulate material
FR2811072B1 (en) * 2000-07-03 2002-10-18 Beaudrey C S GRID FOR INTERCEPTING SOLID ELEMENTS CIRCULATED IN A HEAT EXCHANGER FOR CLEANING THE SAME, AND INSTALLATION FOR MANAGING SUCH ELEMENTS COMPRISING SUCH A GRID
FR2815548B1 (en) * 2000-10-25 2003-08-15 Technos Et Cie SEPARATION GRID FOR SEPARATING CLEANING BODIES FROM A FLUID AND DEVICE COMPRISING SUCH A GRID

Also Published As

Publication number Publication date
ES2340312T3 (en) 2010-06-01
FR2892186A1 (en) 2007-04-20
EP1777481A1 (en) 2007-04-25
FR2892186B1 (en) 2008-02-08
DE602006012413D1 (en) 2010-04-08
ATE458980T1 (en) 2010-03-15

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