EP0515286A1 - Protection apparatus against clogging of plate-like heat-exchangers - Google Patents

Protection apparatus against clogging of plate-like heat-exchangers Download PDF

Info

Publication number
EP0515286A1
EP0515286A1 EP92401413A EP92401413A EP0515286A1 EP 0515286 A1 EP0515286 A1 EP 0515286A1 EP 92401413 A EP92401413 A EP 92401413A EP 92401413 A EP92401413 A EP 92401413A EP 0515286 A1 EP0515286 A1 EP 0515286A1
Authority
EP
European Patent Office
Prior art keywords
heat exchanger
inlet
plates
pipe
plate heat
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.)
Granted
Application number
EP92401413A
Other languages
German (de)
French (fr)
Other versions
EP0515286B1 (en
Inventor
Jean Barbaud
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.)
Electricite de France SA
Original Assignee
Electricite de France 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 Electricite de France SA filed Critical Electricite de France SA
Publication of EP0515286A1 publication Critical patent/EP0515286A1/en
Application granted granted Critical
Publication of EP0515286B1 publication Critical patent/EP0515286B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

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
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/08—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning
    • F28F3/083—Elements constructed for building-up into stacks, e.g. capable of being taken apart for cleaning capable of being taken apart

Definitions

  • Plate heat exchangers are well known for performing heat exchange between two fluids. They consist of a stack of plates tightly sealed against each other with the interposition of a seal so as to produce fluid circulation channels between them, each plate having four holes determining with the holes of the other plates four collectors, namely two inlet collectors and two return collectors, the ends of these collectors being connected, on one side of the stack, to an inlet or return pipe, so as to produce two separate fluid circuits, the seals allowing the communication of the channels with one or the other of said fluid circulation circuits.
  • the channels arranged between the plates are, thanks to the aforementioned seals, assigned to one or the other of the fluid circuits with alternation from one channel to the other.
  • the inlet and return pipes are arranged along a diagonal of the plates which have a rectangular shape.
  • the inlet piping of a circuit is arranged on the same short side of the rectangle as the outlet piping of the second circuit so that the two fluids flow against the current. The ends of the collectors opposite the junction with the inlet or outlet pipes are closed.
  • the refrigerant consists of raw water which contains impurities.
  • a first solution consists in reversing the direction of circulation of the fluid in the clogged circuit; this first process greatly complicates the layout of the pipes and requires the installation of three valves.
  • a second solution involves at least partial disassembly to extract the debris that has become trapped between the plates. This latter solution results in a significant labor expenditure and a fairly long downtime.
  • Another solution is to install a filter upstream of the inlet manifold. This solution is relatively expensive and a complex installation.
  • the present invention therefore proposes to provide a plate heat exchanger which is protected against clogging.
  • the subject of the invention is a plate heat exchanger consisting of a stack of plates tightly sealed against one another with the interposition of a seal so as to produce fluid circulation channels between them, each plate having four holes determining with the holes of the other plates four collectors, namely two inlet collectors and two return collectors, the ends of these collectors being connected, on one side of the stack, to a piping arrival or return, so as to produce two separate fluid circuits, the seals allowing the communication of the channels with one or the other of said fluid circulation circuits, characterized in that at least one of the two inlet manifolds is provided with a peripheral cylindrical filter cartridge, the mesh of which is lower or equal to the distance between two contiguous plates, and is connected, at its end opposite to the inlet pipe, to the corresponding return pipe by a pipe controlled by a valve.
  • the valve is normally closed during operation of the exchanger and circulation in the two circuits is carried out in exactly the same way as in a conventional exchanger.
  • the valve is opened, the debris that has become trapped by the filter cartridge is evacuated by the current of fluid which flows along the inlet manifold and returns directly to the return piping.
  • the above-mentioned pipe is connected to the opposite end to the return pipe of the return manifold.
  • the filter cartridge is constituted by a grid comprising transverse bars assembled by rings and the distance separating two continuous bars is less than or equal to the distance between two adjoining plates.
  • the filter cartridge is formed by bars arranged in the direction of circulation of the fluid makes it possible, during the unclogging operation, facilitate the evacuation of debris blocked by the filter cartridge.
  • Figures 1 and 2 show a plate type heat exchanger of known type. It consists of a number of rectangular plates 1 which are stacked one on top of the other with the interposition of a joint so as to arrange between two adjacent plates a fluid circulation channel.
  • Each plate has four holes marked 2, 3, 4 and 5 which are each arranged in a corner of the rectangle.
  • the alignments of the holes in the plates of the stack determine collectors 6 and 7 (FIG. 2) which can be placed in communication with the channels arranged between the plates.
  • each channel is placed in communication with two collectors, an inlet collector 6 arranged for example at the bottom of the plate and a return collector 7 disposed on the other side. of the plate, that is to say at its upper part.
  • the assembly of two manifolds and the channels connected to them constitutes a first fluid circulation circuit.
  • the other two collectors are associated with the other channels so as to constitute the second fluid circulation circuit.
  • the successive channels are alternately connected to one and the other of the two circuits, the odd-order channels being assigned to a first circuit and the even-order channels to the other circuit.
  • the circulation of the two fluids takes place against the current, that is to say that the inlet manifold of one of the circuits is located in the lower part of the exchanger and the inlet manifold of the other circuit is in its upper part.
  • the two collectors of the same circuit can be diametrically opposite, that is to say, that, for example, the collector constituted by the holes 2 constitutes the input collector d a first circuit with which the outlet collector formed by the holes 4 is associated, while the inlet collector of the circuit is formed by the holes 5, the return collector being formed by the holes 3.
  • Each manifold is connected to an associated inlet 8 or return 9 piping.
  • all the inlet and return pipes are arranged on the same side of the exchanger, on the left in the example shown.
  • the collectors are terminated by a closure plate 11 respectively 12.
  • Figure 3 is a view corresponding to Figure 2 of a plate heat exchanger according to the present invention.
  • the normally closed end of the inlet manifold 26, that is to say its end opposite to that connected to the inlet pipe 28, is connected by a pipe 31 provided with a valve 32 to the corresponding outlet pipe 29.
  • this connection is achieved by the fact that the pipe 31 in fact connects the normally closed ends of the collectors 26 and 27.
  • a filter cartridge 33 of cylindrical shape disposed against the inner wall of the manifold 26; this filter cartridge is therefore disposed between the manifold 26 and the circulation channels associated with it.
  • the section of the pipe 31 is at least equal to the section of the collector 26. This is necessary in the case where the size of the detritus is not negligible compared to that of the collector.
  • the passage section of the valve 32 is at least equal to the section of the pipe 31.
  • the mesh of the filter cartridge 33 is at most equal to the distance separating two adjacent plates, which corresponds to the thickness of the circulation channels.
  • FIG. 4 represents an embodiment of the filter cartridge 33 of FIG. 2. It consists of a set of parallel bars 34 constituting the generatrices of a cylinder. These bars have a square or rectangular section and are held equidistantly by means of rings 35 arranged regularly over the length of the filter cartridge 33.
  • the distance between two contiguous bars 34 is less than or equal to the distance between two neighboring plates.
  • the outer diameter of the rings 35 is slightly less than the diameter of the manifold 26.
  • the refrigerant In the case of an exchanger used in the auxiliary refrigeration circuits of a power plant, the refrigerant consists of raw water which can therefore contain impurities or debris and it is therefore the refrigerant circuit which includes the clogging protection device according to the invention.
  • the filter cartridge 33 stops all the particles whose dimensions are greater than that of the thickness of the circulation channels so that the only particles which can pass through the filter cartridge circulate with the fluid in the circulation channels and are evacuated by the collector outlet 27 and outlet pipe 29.
  • the filter cartridge 33 the only element of the exchanger which can be clogged is the filter cartridge 33.
  • the valve 32 is opened, which is advantageously remote-controlled, and the raw water then circulates at high speed in the collector 26, the pipe 31 and the collector 27; the particles which clog the filter cartridge are entrained by this flow of fluid and evacuated.
  • the valve 32 can then be closed and the exchanger works again in normal fashion.
  • the filter cartridge is constituted by bars arranged along the length of the collector has the consequence that it has no resistance to flow, which promotes the evacuation of the waste which clogs it.
  • the unclogging operation can be very rapid, for example of the order of one minute.
  • the latter can be maintained upstream by a restriction in diameter of the inlet pipe, which will require disassembly of the exchanger .
  • the diameter of the cartridge is advantageous for the diameter of the cartridge to be less than that of the holes in the plates in order to compensate for the misalignment of the latter.
  • the additional elements used by the invention namely the pipe 31 and the valve 32 are arranged on the normally closed side of the plate heat exchanger so that there is no problem of space requirement.
  • the invention makes it possible, with relatively low expense, to avoid clogging of the plates of a plate heat exchanger; the only clogged element, namely the filter cartridge, can be unclogged extremely quickly so that this unclogging operation can be carried out without stopping the operation of the exchanger.
  • the outlet of the collector 26 is directly connected to a drainage device such as a sewer network, without passing through the return collector 27.
  • two valves can be arranged in series on the pipe 31.

Abstract

The present invention relates to a plate heat exchanger consisting of a stack of plates (21) which are clamped in a sealed manner against each other and with seals inserted therebetween so as to form fluid flow channels between them, each plate comprising four holes determining, with the holes of the other plates, four manifolds (26, 27), namely two inlet manifolds and two outlet manifolds, the ends of these manifolds being connected, on one side of the stack, to inlet or outlet piping (28, 29), so as to form two distinct fluid circuits, the seals enabling the channels to communicate with either of the said fluid flow circuits, characterised in that at least one of the two inlet manifolds (26) is provided with a peripheral filtering cartridge (33), whose mesh size is less than or equal to the distance between two contiguous plates (21), and is connected, at its opposite end to the inlet piping (28), to the corresponding outlet piping (29) by a pipe (31) controlled by a valve (32). Application to the auxiliary cooling circuits of power stations. <IMAGE>

Description

Les échangeurs de chaleur à plaques sont bien connus pour réaliser un échange thermique entre deux fluides. Ils sont constitués d'un empilage de plaques serrées de manière étanche les unes contre les autres avec interposition d'un joint d'étanchéité de manière à réaliser entre elles des canaux de circulation de fluide, chaque plaque comportant quatre trous déterminant avec les trous des autres plaques quatre collecteurs, à savoir deux collecteurs d'entrée et deux collecteurs de retour, les extrémités de ces collecteurs étant reliées, d'un côté de l'empilage, à une tuyauterie d'arrivée ou de retour, de manière à réaliser deux circuits de fluide distincts, les joints permettant la communication des canaux avec l'un ou l'autre desdits circuits de circulation de fluide.Plate heat exchangers are well known for performing heat exchange between two fluids. They consist of a stack of plates tightly sealed against each other with the interposition of a seal so as to produce fluid circulation channels between them, each plate having four holes determining with the holes of the other plates four collectors, namely two inlet collectors and two return collectors, the ends of these collectors being connected, on one side of the stack, to an inlet or return pipe, so as to produce two separate fluid circuits, the seals allowing the communication of the channels with one or the other of said fluid circulation circuits.

Généralement, les canaux aménagés entre les plaques sont, grâce aux joints précités, affectés à l'un ou à l'autre des circuits de fluide avec alternance d'un canal à l'autre. Les canalisations d'entrée et de retour sont disposées selon une diagonale des plaques qui ont une forme rectangulaire. De plus, la tuyauterie d'entrée d'un circuit est disposée sur le même petit côté du rectangle que la tuyauterie de sortie du deuxième circuit de telle sorte que les deux fluides circulent à contre-courant. Les extrémités des collecteurs opposées à la jonction avec les tuyauteries d'entrée ou de sortie sont fermées.Generally, the channels arranged between the plates are, thanks to the aforementioned seals, assigned to one or the other of the fluid circuits with alternation from one channel to the other. The inlet and return pipes are arranged along a diagonal of the plates which have a rectangular shape. In addition, the inlet piping of a circuit is arranged on the same short side of the rectangle as the outlet piping of the second circuit so that the two fluids flow against the current. The ends of the collectors opposite the junction with the inlet or outlet pipes are closed.

Ces échangeurs de chaleur sont d'une grande efficacité mais ils présentent l'inconvénient de se colmater par les impuretés véhiculées par les fluides. En particulier, dans le cas des circuits de réfrigération auxiliaire d'une centrale électrique, le fluide réfrigérant est constitué par de l'eau brute qui comporte des impuretés.These heat exchangers are very effective, but they have the drawback of being blocked by the impurities carried by the fluids. In particular, in the case of auxiliary refrigeration circuits of a power plant, the refrigerant consists of raw water which contains impurities.

Lorsque des débris de dimensions supérieures à la distance séparant deux plaques voisines, c'est-à-dire à l'épaisseur du canal de circulation, se trouvent piégés dans le collecteur d'entrée et lorsque la quantité de ces débris est importante, il y a colmatage de l'échangeur qui devient indisponible.When debris of dimensions greater than the distance separating two neighboring plates, that is to say the thickness of the circulation channel, are trapped in the inlet collector and when the quantity of this debris is large, it there is blockage of the exchanger which becomes unavailable.

Il se pose donc le problème de décolmater de manière périodique les échangeurs de chaleur à plaques du type précité.The problem therefore arises of periodically unclogging plate heat exchangers of the aforementioned type.

Une première solution consiste à faire inverser le sens de circulation du fluide dans le circuit colmaté; ce premier procédé complique fortement le tracé des tuyauteries et nécessite l'installation de trois vannes.A first solution consists in reversing the direction of circulation of the fluid in the clogged circuit; this first process greatly complicates the layout of the pipes and requires the installation of three valves.

Une deuxième solution implique un démontage au moins partiel pour en extraire les débris qui se sont coincés entre les plaques. Cette dernière solution se traduit par une dépense en main-d'oeuvre importante et par un temps d'indisponibilité assez long.A second solution involves at least partial disassembly to extract the debris that has become trapped between the plates. This latter solution results in a significant labor expenditure and a fairly long downtime.

Une autre solution consiste à installer un filtre en amont du collecteur d'entrée. Cette solution est relativement onéreuse et d'une installation complexe.Another solution is to install a filter upstream of the inlet manifold. This solution is relatively expensive and a complex installation.

La présente invention se propose donc de fournir un échangeur de chaleur à plaques qui est protégé contre le colmatage.The present invention therefore proposes to provide a plate heat exchanger which is protected against clogging.

L'invention a pour objet un échangeur de chaleur à plaques constitué d'un empilage de plaques serrées de manière étanche les unes contre les autres avec interposition d'un joint d'étanchéité de manière à réaliser entre elles des canaux de circulation de fluide, chaque plaque comportant quatre trous déterminant avec les trous des autres plaques quatre collecteurs, à savoir deux collecteurs d'entrée et deux collecteurs de retour, les extrémités de ces collecteurs étant reliées, d'un côté de l'empilage, à une tuyauterie d'arrivée ou de retour, de manière à réaliser deux circuits de fluide distincts, les joints permettant la communication des canaux avec l'un ou l'autre desdits circuits de circulation de fluide, caractérisé en ce qu'au moins un des deux collecteurs d'entrée est muni d'une cartouche filtrante cylindrique périphérique, dont la maille est inférieure ou égale à la distance entre deux plaques contiguës, et est reliée, à son extrémité opposée à la tuyauterie d'arrivée, à la tuyauterie de retour correspondante par une canalisation commandée par une vanne.The subject of the invention is a plate heat exchanger consisting of a stack of plates tightly sealed against one another with the interposition of a seal so as to produce fluid circulation channels between them, each plate having four holes determining with the holes of the other plates four collectors, namely two inlet collectors and two return collectors, the ends of these collectors being connected, on one side of the stack, to a piping arrival or return, so as to produce two separate fluid circuits, the seals allowing the communication of the channels with one or the other of said fluid circulation circuits, characterized in that at least one of the two inlet manifolds is provided with a peripheral cylindrical filter cartridge, the mesh of which is lower or equal to the distance between two contiguous plates, and is connected, at its end opposite to the inlet pipe, to the corresponding return pipe by a pipe controlled by a valve.

La vanne est normalement fermée pendant le fonctionnement de l'échangeur et la circulation dans les deux circuits s'effectue exactement de la même manière que dans un échangeur classique. Lorsque l'on ouvre la vanne, les débris qui sont restés coincés par la cartouche filtrante sont évacués par le courant du fluide qui circule tout le long du collecteur d'entrée et retourne directement à la tuyauterie de retour.The valve is normally closed during operation of the exchanger and circulation in the two circuits is carried out in exactly the same way as in a conventional exchanger. When the valve is opened, the debris that has become trapped by the filter cartridge is evacuated by the current of fluid which flows along the inlet manifold and returns directly to the return piping.

Avantageusement, la canalisation précitée est reliée à l'extrémité opposée à la tuyauterie de retour du collecteur de retour.Advantageously, the above-mentioned pipe is connected to the opposite end to the return pipe of the return manifold.

De cette manière, l'encombrement est réduit puisqu'il sagit simplement de rajouter une canalisation munie d'une vanne à l'arrière de l'échangeur de chaleur à plaques, endroit où il y a beaucoup de place disponible sans gêner l'encombrement.In this way, the space requirement is reduced since it simply involves adding a pipe fitted with a valve to the rear of the plate heat exchanger, a place where there is a lot of space available without disturbing the space requirement. .

Selon un mode de réalisation de l'invention, la cartouche filtrante est constituée par une grille comportant des barreaux transversaux assemblés par des anneaux et la distance séparant deux barreaux continus est inférieure ou égale à la distance entre deux plaques contiguës.According to one embodiment of the invention, the filter cartridge is constituted by a grid comprising transverse bars assembled by rings and the distance separating two continuous bars is less than or equal to the distance between two adjoining plates.

Le fait que la cartouche filtrante soit constituée par des barreaux disposés dans le sens de circulation du fluide permet, lors de l'opération de décolmatage, de faciliter l'évacuation des débris bloqués par la cartouche filtrante.The fact that the filter cartridge is formed by bars arranged in the direction of circulation of the fluid makes it possible, during the unclogging operation, facilitate the evacuation of debris blocked by the filter cartridge.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui suit d'un exemple de réalisation de l'invention, faite en se référant aux dessins annexés sur lesquels :

  • la figure 1 représente en vue de face une plaque d'un échangeur de chaleur à plaques de type connu;
  • la figure 2 est une vue de profil en coupe d'un échangeur constitué d'un empilement de plaques de la figure 1 ;
  • la figure 3 est une vue de profil d'un échangeur de chaleur à plaques conforme à la présente invention; et
  • la figure 4 est une vue de détail représentant la cartouche filtrante.
Other characteristics and advantages of the invention will emerge from the following description of an exemplary embodiment of the invention, made with reference to the appended drawings in which:
  • Figure 1 shows a front view of a plate of a plate type heat exchanger of known type;
  • Figure 2 is a sectional side view of an exchanger consisting of a stack of plates of Figure 1;
  • Figure 3 is a side view of a plate heat exchanger according to the present invention; and
  • Figure 4 is a detail view showing the filter cartridge.

Les figures 1 et 2 représentent un échangeur de chaleur à plaques de type connu. Il est constitué d'un certain nombres de plaques 1 rectangulaires qui sont empilées les unes sur les autres avec interposition d'un joint de manière à aménager entre deux plaques contiguës un canal de circulation de fluide.Figures 1 and 2 show a plate type heat exchanger of known type. It consists of a number of rectangular plates 1 which are stacked one on top of the other with the interposition of a joint so as to arrange between two adjacent plates a fluid circulation channel.

Chaque plaque comporte quatre trous repérés 2, 3, 4 et 5 qui sont disposés chacun dans un angle du rectangle. Les alignements des trous des plaques de l'empilement déterminent des collecteurs 6 et 7 (figure 2) qui peuvent être mis en communication avec les canaux aménagés entre les plaques.Each plate has four holes marked 2, 3, 4 and 5 which are each arranged in a corner of the rectangle. The alignments of the holes in the plates of the stack determine collectors 6 and 7 (FIG. 2) which can be placed in communication with the channels arranged between the plates.

Les joints disposés entre les plaques sont conformés et disposés de telle manière que chaque canal est mis en communication avec deux collecteurs, un collecteur d'entrée 6 disposé par exemple en bas de la plaque et un collecteur de retour 7 disposé de l'autre côté de la plaque, c'est-à-dire à sa partie supérieure.The seals arranged between the plates are shaped and arranged in such a way that each channel is placed in communication with two collectors, an inlet collector 6 arranged for example at the bottom of the plate and a return collector 7 disposed on the other side. of the plate, that is to say at its upper part.

L'ensemble de deux collecteurs et des canaux qui leur sont reliés constitue un premier circuit de circulation de fluide. Les deux autres collecteurs sont associés aux autres canaux de manière à constituer le deuxième circuit de circulation de fluide.The assembly of two manifolds and the channels connected to them constitutes a first fluid circulation circuit. The other two collectors are associated with the other channels so as to constitute the second fluid circulation circuit.

Avantageusement, les canaux successifs sont alternativement reliés à l'un et à l'autre des deux circuits, les canaux d'ordre impair étant affectés à un premier circuit et les canaux d'ordre pair à l'autre circuit.Advantageously, the successive channels are alternately connected to one and the other of the two circuits, the odd-order channels being assigned to a first circuit and the even-order channels to the other circuit.

De cette manière, on réalise l'échange thermique entre les deux fluides circulant dans les deux circuits de circulation de fluide.In this way, the heat exchange between the two fluids flowing in the two fluid circulation circuits is carried out.

Avantageusement, la circulation des deux fluides s'effectue à contre-courant, c'est-à-dire que le collecteur d'entrée d'un des circuits se trouve dans la partie inférieure de l'échangeur et le collecteur d'entrée de l'autre circuit se trouve dans sa partie supérieure. De plus, pour améliorer l'échange thermique, les deux collecteurs d'un même circuit peuvent être diamétralement opposés, c'est-à-dire, que, par exemple, le collecteur constitué par les trous 2 constitue le collecteur d'entrée d'un premier circuit auquel est associé le collecteur de sortie constitué par les trous 4 alors que le collecteur d'entrée du circuit est constitué par les trous 5, le collecteur de retour étant constitué par les trous 3.Advantageously, the circulation of the two fluids takes place against the current, that is to say that the inlet manifold of one of the circuits is located in the lower part of the exchanger and the inlet manifold of the other circuit is in its upper part. In addition, to improve the heat exchange, the two collectors of the same circuit can be diametrically opposite, that is to say, that, for example, the collector constituted by the holes 2 constitutes the input collector d a first circuit with which the outlet collector formed by the holes 4 is associated, while the inlet collector of the circuit is formed by the holes 5, the return collector being formed by the holes 3.

Chaque collecteur est relié à une tuyauterie associée d'entrée 8 ou de retour 9. Avantageusement toutes les tuyauteries d'entrée et de retour sont disposées d'un même côté de l'échangeur, à gauche dans l'exemple représenté. A l'autre extrémité, les collecteurs sont terminés par une plaque de fermeture 11 respectivement 12.Each manifold is connected to an associated inlet 8 or return 9 piping. Advantageously, all the inlet and return pipes are arranged on the same side of the exchanger, on the left in the example shown. At the other end, the collectors are terminated by a closure plate 11 respectively 12.

La figure 3 est une vue correspondante à la figure 2 d'un échangeur de chaleur à plaques conforme à la présente invention.Figure 3 is a view corresponding to Figure 2 of a plate heat exchanger according to the present invention.

Pour au moins un des circuits de circulation de fluide, l'extrémité normalement fermée du collecteur d'entrée 26, c'est-à-dire son extrémité opposée à celle reliée à la tuyauterie d'entrée 28, est reliée par une canalisation 31 munie d'une vanne 32 à la tuyauterie de sortie correspondante 29. Avantageusement, cette liaison est réalisée par le fait que la canalisation 31 relie en fait les extrémités normalement fermées des collecteurs 26 et 27.For at least one of the fluid circulation circuits, the normally closed end of the inlet manifold 26, that is to say its end opposite to that connected to the inlet pipe 28, is connected by a pipe 31 provided with a valve 32 to the corresponding outlet pipe 29. Advantageously, this connection is achieved by the fact that the pipe 31 in fact connects the normally closed ends of the collectors 26 and 27.

Selon une autre caractéristique de l'invention, on dispose dans le collecteur d'entrée 26 une cartouche filtrante 33 de forme cylindrique disposée contre la paroi intérieure du collecteur 26 ; cette cartouche filtrante est donc disposée entre le collecteur 26 et les canaux de circulation qui lui sont associés.According to another characteristic of the invention, there is in the inlet manifold 26 a filter cartridge 33 of cylindrical shape disposed against the inner wall of the manifold 26; this filter cartridge is therefore disposed between the manifold 26 and the circulation channels associated with it.

Avantageusement, la section de la canalisation 31 est au moins égale à la section du collecteur 26. Ceci est nécessaire dans le cas où la taille des détritus n'est pas négligeable devant celle du collecteur.Advantageously, the section of the pipe 31 is at least equal to the section of the collector 26. This is necessary in the case where the size of the detritus is not negligible compared to that of the collector.

On peut également envisager une réduction de section de la canalisation 31 par rapport au collecteur, par exemple pour limiter la variation de débits dans le circuit.One can also consider a reduction in section of the pipe 31 relative to the manifold, for example to limit the variation of flow rates in the circuit.

De plus, la section de passage de la vanne 32 est au moins égale à la section de la canalisation 31.In addition, the passage section of the valve 32 is at least equal to the section of the pipe 31.

La maille de la cartouche filtrante 33 est au plus égale à la distance séparant deux plaques voisines, ce qui correspond à l'épaisseur des canaux de circulation.The mesh of the filter cartridge 33 is at most equal to the distance separating two adjacent plates, which corresponds to the thickness of the circulation channels.

La figure 4 représente un mode de réalisation de la cartouche filtrante 33 de la figure 2. Elle est constituée d'un ensemble de barreaux parallèles 34 constituant les génératrices d'un cylindre. Ces barreaux ont une section carrée ou rectangulaire et sont maintenus de manière équidistante au moyen d'anneaux 35 disposés régulièrement sur la longueur de la cartouche filtrante 33.FIG. 4 represents an embodiment of the filter cartridge 33 of FIG. 2. It consists of a set of parallel bars 34 constituting the generatrices of a cylinder. These bars have a square or rectangular section and are held equidistantly by means of rings 35 arranged regularly over the length of the filter cartridge 33.

La distance entre deux barreaux contigus 34 est inférieure ou égale à la distance entre deux plaques voisines. Le diamètre extérieur des anneaux 35 est légèrement inférieur au diamètre du collecteur 26. Ces anneaux de maintien sont répartis de manière à ne pas obstruer les plaques.The distance between two contiguous bars 34 is less than or equal to the distance between two neighboring plates. The outer diameter of the rings 35 is slightly less than the diameter of the manifold 26. These retaining rings are distributed so as not to obstruct the plates.

Le fonctionnement de l'échangeur qui vient d'être décrit est le suivant. En fonctionnement normal, la vanne 32 est fermée et le liquide arrivant par la tuyauterie d'entrée 28 dans le collecteur 26 traverse les canaux qui lui sont affectés et est récupérée par le collecteur 27 puis évacuée par la tuyauterie de sortie 29. L'échangeur fonctionne donc de la même manière qu'un échangeur de chaleur à plaques de type connu.The operation of the exchanger which has just been described is as follows. In normal operation, the valve 32 is closed and the liquid arriving through the inlet piping 28 in the manifold 26 passes through the channels which are assigned to it and is recovered by the manifold 27 then discharged through the outlet piping 29. The exchanger It therefore works in the same way as a known type plate heat exchanger.

Dans le cas d'un échangeur utilisé dans les circuits de réfrigération auxiliaire d'une centrale électrique, le fluide réfrigérant est constitué par de l'eau brute qui peut donc contenir des impuretés ou des débris et c'est donc le circuit du réfrigérant qui comporte le dispositif de protection contre le colmatage selon l'invention.In the case of an exchanger used in the auxiliary refrigeration circuits of a power plant, the refrigerant consists of raw water which can therefore contain impurities or debris and it is therefore the refrigerant circuit which includes the clogging protection device according to the invention.

La cartouche filtrante 33 arrête toutes les particules dont les dimensions sont supérieures à celle de l'épaisseur des canaux de circulation si bien que les seules particules qui peuvent traverser la cartouche filtrante circulent avec le fluide dans les canaux de circulation et sont évacués par le collecteur de sortie 27 et la canalisation de sortie 29.The filter cartridge 33 stops all the particles whose dimensions are greater than that of the thickness of the circulation channels so that the only particles which can pass through the filter cartridge circulate with the fluid in the circulation channels and are evacuated by the collector outlet 27 and outlet pipe 29.

Il en résulte que le seul élément de l'échangeur qui peut être colmaté est la cartouche filtrante 33. Lorsque cela se produit, ou à intervalles réguliers, lors d'opérations d'entretien, on ouvre la vanne 32, qui est avantageusement télécommandée, et l'eau brute circule alors à grande vitesse dans le collecteur 26, la canalisation 31 et le collecteur 27 ; les particules qui colmatent la cartouche filtrante sont entraînées par ce flux de fluide et évacuées. On peut alors refermer la vanne 32 et l'échangeur fonctionne de nouveau de manière normale.As a result, the only element of the exchanger which can be clogged is the filter cartridge 33. When this occurs, or at regular intervals, during maintenance operations, the valve 32 is opened, which is advantageously remote-controlled, and the raw water then circulates at high speed in the collector 26, the pipe 31 and the collector 27; the particles which clog the filter cartridge are entrained by this flow of fluid and evacuated. The valve 32 can then be closed and the exchanger works again in normal fashion.

Le fait que la cartouche filtrante soit constituée par des barreaux disposés selon la longueur du collecteur a pour conséquence qu'elle ne présente de résistance à l'écoulement, ce qui favorise l'évacuation des déchets qui la colmate. Il en résulte que l'opération de décolmatage peut être très rapide, par exemple de l'ordre de une minute.The fact that the filter cartridge is constituted by bars arranged along the length of the collector has the consequence that it has no resistance to flow, which promotes the evacuation of the waste which clogs it. As a result, the unclogging operation can be very rapid, for example of the order of one minute.

Le fait que le diamètre extérieur des anneaux de maintien 35 soit légèrement inférieur au diamètre intérieur du collecteur 26 permet une mise en place aisée de cette cartouche filtrante dans un collecteur quelconque, sans démontage de l'échangeur. Par conséquent, les échangeurs existants peuvent être facilement et rapidement équipés avec le dispositif de décolmatage selon l'invention.The fact that the outside diameter of the retaining rings 35 is slightly less than the inside diameter of the manifold 26 allows easy installation of this filter cartridge in any manifold, without dismantling the exchanger. Consequently, existing exchangers can be easily and quickly fitted with the unclogging device according to the invention.

Dans le cas où les plaques ne sont pas suffisamment bien alignées pour assurer le maintien de la cartouche, cette dernière pourra être maintenue à l'amont par une restriction de diamètre de la tubulure d'entrée, ce qui nécessitera un démontage de l'échangeur.In the case where the plates are not sufficiently well aligned to ensure the maintenance of the cartridge, the latter can be maintained upstream by a restriction in diameter of the inlet pipe, which will require disassembly of the exchanger .

De toute façon, il est avantageux que le diamètre de la cartouche soit inférieur à celui des trous des plaques afin de compenser le défaut d'alignement de ces dernières.In any case, it is advantageous for the diameter of the cartridge to be less than that of the holes in the plates in order to compensate for the misalignment of the latter.

La facilité de montage et de démontage de la cartouche permet également de la remplacer dans le cas oùThe ease of assembly and disassembly of the cartridge also makes it possible to replace it in the event that

La facilité de montage et de démontage de la cartouche permet également de la remplacer dans le cas où l'ouverture de la vanne 32 n'aurait pas permis de la décolmater.The ease of assembly and disassembly of the cartridge also makes it possible to replace it in the case where the opening of the valve 32 would not have made it possible to unclog it.

Les éléments supplémentaires utilisés par l'invention, à savoir la canalisation 31 et la vanne 32 sont disposés du côté normalement fermé de l'échangeur de chaleur à plaques si bien qu'il ne se pose pas de problème d'encombrement.The additional elements used by the invention, namely the pipe 31 and the valve 32 are arranged on the normally closed side of the plate heat exchanger so that there is no problem of space requirement.

On voit donc que l'invention permet avec une dépense relativement faible d'éviter le colmatage des plaques d'un échangeur de chaleur à plaques ; le seul élément colmaté, à savoir la cartouche filtrante, peut être décolmaté extrêmement rapidement si bien que cette opération de décolmatage peut être réalisée sans arrêter le fonctionnement de l'échangeur.It can therefore be seen that the invention makes it possible, with relatively low expense, to avoid clogging of the plates of a plate heat exchanger; the only clogged element, namely the filter cartridge, can be unclogged extremely quickly so that this unclogging operation can be carried out without stopping the operation of the exchanger.

La description ci-dessus n'a été fournie qu'à titre d'exemple illustratif et nullement limitatif et l'on peut y apporter des modifications ou variantes sans pour autant sortir du cadre de la présente invention.The above description has been provided by way of illustration only and is in no way limitative and modifications or variants can be made without departing from the scope of the present invention.

En particulier, on peut relier directement la sortie du collecteur 26 à la tuyauterie de retour 29 sans passer par le collecteur de retour 27. Par ailleurs, bien évidemment, on peut disposer un dispositif de protection contre le colmatage sur les deux circuits de l'échangeur si cela est nécessaire.In particular, it is possible to directly connect the outlet of the manifold 26 to the return pipe 29 without passing through the return manifold 27. Furthermore, of course, it is possible to have a device for protection against clogging on the two circuits of the exchanger if necessary.

Selon une autre variante, la sortie du collecteur 26 est reliée directement à un dispositif de vidange tel qu'un réseau d'égout, sans passer par le collecteur de retour 27.According to another variant, the outlet of the collector 26 is directly connected to a drainage device such as a sewer network, without passing through the return collector 27.

Par ailleurs, pour accroître la fiabilité du dispositif, on peut disposer deux vannes en série sur la canalisation 31.Furthermore, to increase the reliability of the device, two valves can be arranged in series on the pipe 31.

Claims (9)

Echangeur de chaleur à plaques constitué d'un empilage de plaques (1;21) serrées de manière étanche les unes contre les autres avec interposition d'un joint d'étanchéité de manière à réaliser entre elles des canaux de circulation de fluide, chaque plaque comportant quatre trous (2-5) déterminant avec les trous des autres plaques quatre collecteurs (6,7;26,27), à savoir deux collecteurs d'entrée et deux collecteurs de retour, les extrémités de ces collecteurs étant reliées, d'un côté de l'empilage, à une tuyauterie d'arrivée ou de retour (8,9;28,29), de manière à réaliser deux circuits de fluide distincts, les joints permettant la communication des canaux avec l'un ou l'autre desdits circuits de circulation de fluide, caractérisé en ce qu'au moins un des deux collecteurs d'entrée (26) est muni d'une cartouche filtrante périphérique (33), dont la maille est inférieure ou égale à la distance entre deux plaques (21) contiguës, et est relié, à son extrémité opposée à la tuyauterie d'arrivée (28), à la tuyauterie de retour (29) correspondante par une canalisation (31) commandée par une vanne (32) ou à un dispositif de vidange.Plate heat exchanger consisting of a stack of plates (1; 21) tightly sealed against one another with the interposition of a seal so as to form fluid circulation channels between them, each plate comprising four holes (2-5) determining with the holes of the other plates four collectors (6,7; 26,27), namely two inlet collectors and two return collectors, the ends of these collectors being connected, one side of the stack, to an inlet or return pipe (8,9; 28,29), so as to produce two separate fluid circuits, the joints allowing the communication of the channels with one or the other of said fluid circulation circuits, characterized in that at least one of the two inlet collectors (26) is provided with a peripheral filter cartridge (33), the mesh of which is less than or equal to the distance between two plates (21) contiguous, and is connected, to its extrem ity opposite to the inlet pipe (28), to the corresponding return pipe (29) by a pipe (31) controlled by a valve (32) or to a draining device. Echangeur de chaleur à plaques selon la revendication 1, caractérisé en ce que ladite canalisation (31) est reliée à l'extrémité opposée à la tuyauterie de retour (29) du collecteur de retour (27).Plate heat exchanger according to claim 1, characterized in that said pipe (31) is connected to the opposite end to the return pipe (29) of the return manifold (27). Echangeur de chaleur à plaques selon la revendication 1 ou 2, caractérisé en ce que la cartouche filtrante (33) est constituée par une grille comportant des barreaux (34) assemblés par des anneaux (35) et en ce que la distance séparant deux barreaux (34) contigus est inférieure ou égale à la distance entre deux plaques (21) contiguës.Plate heat exchanger according to claim 1 or 2, characterized in that the filter cartridge (33) consists of a grid comprising bars (34) joined by rings (35) and in that the distance separating two bars ( 34) contiguous is less than or equal to the distance between two contiguous plates (21). Echangeur de chaleur à plaques selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la vanne a une section au moins égale à celle de la canalisation (31).Plate heat exchanger according to any one of claims 1 to 3, characterized in that the valve has a section at least equal to that of the pipe (31). Echangeur de chaleur à plaques selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la vanne (32) est télécommandée.Plate heat exchanger according to any one of claims 1 to 4, characterized in that the valve (32) is remote-controlled. Echangeur de chaleur à plaques selon la revendication 3, caractérisé en ce que les barreaux (34) ont une section carrée ou rectangulaire.Plate heat exchanger according to claim 3, characterized in that the bars (34) have a square or rectangular section. Echangeur de chaleur à plaques selon l'une quelconque des revendications 3 à 6, caractérisé en ce que la distance entre plaques (21) contiguës est de 4 à 5 mm et en ce que la distance entre deux barreaux (34) voisins est d'environ 3 mm.Plate heat exchanger according to any one of Claims 3 to 6, characterized in that the distance between adjacent plates (21) is 4 to 5 mm and in that the distance between two neighboring bars (34) is about 3 mm. Echangeur de chaleur à plaques selon l'une quelconque des revendications 1 à 7, caractérisé en ce que chacun des deux circuits de circulation de fluide comporte une cartouche filtrante (33) et une canalisation de raccordement (31) du collecteur d'entrée à la tuyauterie de retour.Plate heat exchanger according to any one of Claims 1 to 7, characterized in that each of the two fluid circulation circuits comprises a filter cartridge (33) and a connection pipe (31) from the inlet manifold to the return piping. Echangeur de chaleur à plaques selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la canalisation de raccordement (31) comporte deux vannes en série.Plate heat exchanger according to any one of claims 1 to 8, characterized in that the connection pipe (31) comprises two valves in series.
EP92401413A 1991-05-24 1992-05-22 Protection apparatus against clogging of plate-like heat-exchangers Revoked EP0515286B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9106295A FR2676803A1 (en) 1991-05-24 1991-05-24 DEVICE FOR PROTECTION AGAINST BLOCKING OF PLATE HEAT EXCHANGERS.
FR9106295 1991-05-24
US07/981,853 US5307868A (en) 1991-05-24 1992-11-24 Device for preventing choking in plate heat exchangers
CA002083724A CA2083724A1 (en) 1991-05-24 1992-11-25 Corrosion protection device for plates heat exchangers

Publications (2)

Publication Number Publication Date
EP0515286A1 true EP0515286A1 (en) 1992-11-25
EP0515286B1 EP0515286B1 (en) 1996-03-27

Family

ID=27169259

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401413A Revoked EP0515286B1 (en) 1991-05-24 1992-05-22 Protection apparatus against clogging of plate-like heat-exchangers

Country Status (8)

Country Link
US (1) US5307868A (en)
EP (1) EP0515286B1 (en)
AT (1) ATE136111T1 (en)
CA (1) CA2083724A1 (en)
DE (1) DE69209365T2 (en)
DK (1) DK0515286T3 (en)
ES (1) ES2088115T3 (en)
FR (1) FR2676803A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5509467A (en) * 1994-06-28 1996-04-23 Champion Clam Traps, Inc. Heat exchanger tube strainer
SE518058C2 (en) * 2000-12-22 2002-08-20 Alfa Laval Ab Component for supporting a filter member in a port channel to a plate heat exchanger, device comprising a tubular filter member and said component, and plate heat exchanger comprising a tubular filter member and said component
DE102006038720A1 (en) * 2006-08-18 2008-02-21 Gea Ecoflex Gmbh Plate heat exchanger
DE102015216481A1 (en) * 2015-08-28 2017-03-02 Volkswagen Aktiengesellschaft Plate-type heat exchanger with by-pass and method for producing a plate-type heat exchanger with bypass
CN108419412B (en) * 2018-02-08 2020-01-14 惠州汉旭五金塑胶科技有限公司 Water-cooling row with impurity filtering function
CN113532162A (en) * 2021-07-07 2021-10-22 衢州市智能制造技术与装备研究院 Corrosion-resistant heat exchanger with automatic speed-changing and filtering functions

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1207919A (en) * 1968-10-29 1970-10-07 Apv Co Ltd Improvements in or relating to plate heat exchangers
US3605881A (en) * 1968-09-05 1971-09-20 Hisaka Works Ltd Plate heat exchanger

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR892333A (en) * 1942-11-24 1944-04-04 Cooler for automotive gasifiers
JPS51114758A (en) * 1975-04-01 1976-10-08 Toshiba Corp Heat exchanger for making cooling water out of sea water
NL184024C (en) * 1980-09-05 1989-03-16 Esmil Bv DEVICE WITH A NUMBER OF HEAT EXCHANGERS PLACED ABOVE EACH OTHER.
JPS57188999A (en) * 1981-05-19 1982-11-20 Toshiba Corp Foreign body removing device for heat exchanger
US4590994A (en) * 1984-08-17 1986-05-27 Champion Elmer L Heat exchanger tube strainer
SU1225514A2 (en) * 1984-11-20 1986-04-23 Головное Специализированное Конструкторское Бюро По Комплексу Машин Для Ферм Крупного Рогатого Скота Milk cooler
US4790514A (en) * 1988-01-27 1988-12-13 Marks Harold L Remote control valve operator
US4838310A (en) * 1988-03-28 1989-06-13 Motorola, Inc. Hydroelectrically powered, remotely controlled irrigation system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3605881A (en) * 1968-09-05 1971-09-20 Hisaka Works Ltd Plate heat exchanger
GB1207919A (en) * 1968-10-29 1970-10-07 Apv Co Ltd Improvements in or relating to plate heat exchangers

Also Published As

Publication number Publication date
DE69209365T2 (en) 1996-09-26
FR2676803A1 (en) 1992-11-27
DK0515286T3 (en) 1996-06-10
DE69209365D1 (en) 1996-05-02
ATE136111T1 (en) 1996-04-15
EP0515286B1 (en) 1996-03-27
ES2088115T3 (en) 1996-08-01
CA2083724A1 (en) 1994-05-26
US5307868A (en) 1994-05-03

Similar Documents

Publication Publication Date Title
EP0515286B1 (en) Protection apparatus against clogging of plate-like heat-exchangers
WO2010026352A2 (en) Heating system with optimized recovery of waste water heat
FR2890148A1 (en) Compliant connection for suction strainer modules in emergency core cooling system for nuclear reactor comprises coupler, first garter spring, second garter spring, and pair of adjacent flow modules each with flowpath
EP2239064B1 (en) Balls cleaning apparatus for heat exchanger
EP2368087B1 (en) Facility for recovering heat energy from wastewater and self-cleaning filter for such a facility
EP1155271B1 (en) Plate heat exchanger with an integrated valve
EP0877222B1 (en) Device for injecting pressurized fluids in a plate-like heat exchanger and process for cleaning this injection device
FR2982357A1 (en) Installation for recovering heat from fluid circulating in drain in sewage system, has heat exchanger installed on circuit, and connection junction installed in point downstream of drain, to which fluid part is reinjected into drain
EP0319409B1 (en) Cold trap for the purification of liquid metals with zones of separated traps
EP0694749B1 (en) Solid particle cooling device at the outlet of a treatment arrangement
WO1999040993A1 (en) Separator for three-phase mixture to be used under the sea
CA2514502C (en) Pipe-connecting device
FR2764680A1 (en) Condenser for vehicle air conditioning system.
BE1012278A3 (en) Boiler manifold and boiler fitted with such a manifold
FR2919635A1 (en) PY-PASS DEVICE FOR HYDROCARBON SEPARATOR FOR TREATING RUNOFF WATER
FR2803025A1 (en) Plate heat exchanger has two main openings linked by channel in top plate equipped with discharge valve
EP4078056A1 (en) Heat exchanger with attached collector
FR2935783A1 (en) Heating system for use in building, has internal and external heat exchangers recovering calories in vat and using calories in heat pump, where vat is emptied by overflowing waste water through waste water outlet
FR2793875A1 (en) Plate heat exchanger has enclosed elongate bundle of plates open at one end within closed elongate drum with free space around enclosed bundle
FR3058787B1 (en) HEAT EXCHANGER
FR2546414A1 (en) CARTRIDGE FILTER, AS WELL AS A FILTRATION SYSTEM INCLUDING SUCH A FILTER
FR2738906A1 (en) BEAM OF PLATES FOR A HEAT EXCHANGER AND HEAT EXCHANGER COMPRISING SUCH A BEAM OF PLATES
FR2863697A1 (en) Heat exchanger, has evacuation collector, formed of single piece, connected to enclosure for evacuation of coolant from enclosure, and device placed in collector to separate cleaning balls from coolant which transports them
WO2011141670A1 (en) Method and device for unclogging a heat exchanger
WO2011144862A2 (en) Method and device for heat exchanger fouling removal

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE

17P Request for examination filed

Effective date: 19930510

17Q First examination report despatched

Effective date: 19931229

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE

REF Corresponds to:

Ref document number: 136111

Country of ref document: AT

Date of ref document: 19960415

Kind code of ref document: T

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

REF Corresponds to:

Ref document number: 69209365

Country of ref document: DE

Date of ref document: 19960502

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Effective date: 19960531

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

REG Reference to a national code

Ref country code: ES

Ref legal event code: BA2A

Ref document number: 2088115

Country of ref document: ES

Kind code of ref document: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19960628

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2088115

Country of ref document: ES

Kind code of ref document: T3

SC4A Pt: translation is available

Free format text: 960509 AVAILABILITY OF NATIONAL TRANSLATION

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PLBQ Unpublished change to opponent data

Free format text: ORIGINAL CODE: EPIDOS OPPO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

26 Opposition filed

Opponent name: ALFA LAVAL AB

Effective date: 19961219

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19970327

Year of fee payment: 6

NLR1 Nl: opposition has been filed with the epo

Opponent name: ALFA LAVAL AB

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19970418

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DK

Payment date: 19970421

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19970424

Year of fee payment: 6

Ref country code: LU

Payment date: 19970424

Year of fee payment: 6

Ref country code: AT

Payment date: 19970424

Year of fee payment: 6

Ref country code: DE

Payment date: 19970424

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PT

Payment date: 19970505

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19970514

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19970516

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19970529

Year of fee payment: 6

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19970613

Year of fee payment: 6

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980522

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980522

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980523

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980523

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980531

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980531

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980531

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19980630

BERE Be: lapsed

Owner name: ELECTRICITE DE FRANCE SERVICE NATIONAL

Effective date: 19980531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19981130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19981201

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19980522

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed

Ref document number: 92401413.7

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 19981201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: PT

Ref legal event code: MM4A

Free format text: LAPSE DUE TO NON-PAYMENT OF FEES

Effective date: 19981130

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 19990108

REG Reference to a national code

Ref country code: PT

Ref legal event code: MF4A

Effective date: 19990531

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP