EP1972783B1 - Dispensing pump with an isolating membrane of one of its walls or end flange of the dispensing chamber - Google Patents
Dispensing pump with an isolating membrane of one of its walls or end flange of the dispensing chamber Download PDFInfo
- Publication number
- EP1972783B1 EP1972783B1 EP08290218A EP08290218A EP1972783B1 EP 1972783 B1 EP1972783 B1 EP 1972783B1 EP 08290218 A EP08290218 A EP 08290218A EP 08290218 A EP08290218 A EP 08290218A EP 1972783 B1 EP1972783 B1 EP 1972783B1
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- EP
- European Patent Office
- Prior art keywords
- pump
- sheet
- fluid
- chamber
- side plate
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2225/00—Synthetic polymers, e.g. plastics; Rubber
- F05C2225/04—PTFE [PolyTetraFluorEthylene]
Definitions
- the invention relates to a pump for the dosing of an extremely corrosive product.
- Such a pump conventionally comprises a pump head which defines a pumping chamber, that is to say a variable volume chamber by deformation or displacement of a wall of the head.
- This chamber is secured to a frame that supports the pump head and the driving members coupled to the movable or deformable wall.
- the aggressiveness of the pumped fluid leads to the use of noble materials for the parts in contact with the fluid: stainless steels, special alloys, titanium, etc. which are particularly expensive.
- the most common structure of a pump head consists of a thick disk-shaped piece, hollowed out to define a concave cap that forms the pumping chamber on which the valve boxes are implanted. This cap is closed by the membrane, pinched between the workpiece and the frame of the pump.
- the hollow part is a part that offers a large surface in contact with the pumped fluid. It is also a massive piece that, when it must be made of highly chemically unassailable material, is extremely expensive.
- the coating of the surface of this part turned towards the pumping chamber by means of either a kind of vulcanization (cf. US2,753,804 ) or by a kind of skin, for example polyethylene tetrafluoride formed by molding and held by clipping into the pumping chamber (see US 3,000,320 ).
- the preamble of independent claim 1 is based on the document US 3000,320 .
- the invention proposes to solve the question of the passivation of this surface exposed to the pumped fluid, by proposing a coating of this surface by means of a skin perfectly coapted to the shape of the surface to be protected so that no degradation of mechanical origin or as a result of fatigue over time, can not affect this protection.
- the subject of the invention is therefore a pump, in particular for chemically reactive fluid, in which a pump head comprises at least two walls between which is defined a pumping chamber for the fluid in question, one of the walls being fixed, the other being movable or deformable with respect to the fixed wall by means of a driving or deformation device, the at least one fixed wall being provided with a protective coating with respect to the fluid, characterized in that the coating consists of by a sheet of plastic material, sealingly pressed against the surface at the periphery thereof, the space between the protected surface and the covering sheet, within the line of their sealing contact being filled with an incompressible liquid.
- the composite material formed of the liquid and the plastic sheet is a non-deformable material under the effect of alternating pressures and depressions that prevail in the chamber. Indeed, the liquid having completely filled the space between the surface and the sheet has chased away any bubble of gas which could, by its compressibility and therefore the variation of its volume, leave a freedom of deformation to the sheet with respect to the wall which it protects, deformation which would have reduced the cubic capacity of the pump and which would have constituted a stress of fatigue of the sheet leading quickly to its tearing.
- This surface resistance can be imparted to the sheet in at least two different ways.
- the first is to conform the sheet substantially spherical or conical cap, in congruence with the inner surface of the flange to marry it as accurately as possible, with the convexity of this shape facing the interior of the chamber.
- the second is to set up a protective plate of the surface of the sheet turned on the side of the pumping chamber, protective plate of noble material having good corrosion resistance.
- the pump is finally equipped with means for proceeding in a simple and correct way to the mounting of the protective sheet, either at the time of initial assembly of the pump, or at the time of reassembly thereof after regular maintenance operations.
- These are two orifices which is equipped with the flange, opening in the immediate vicinity of the sealing line between the sheet and the pump head, one in the lowest part and the other in the most important part. top of the pumping chamber, each having a threaded plug for closure.
- a protective cap of the cap covers each of them and rests on an outer surface of the flange by a bearing face having a sealing O-ring surrounding the plug and housed in a conical bottom groove, allowing the radial expansion of this seal under the effect of a fluid under pressure from the cap and the creation of a leakage of this fluid between the cover and the flange.
- the pump head shown in figure 1 comprises, in known manner, a cylindrical ring 1 on the left flank of which is reported a flange 2, in the form of solid disc, by means of peripheral screws not shown while its right side is attached to a pump frame 3 which in closes and supports all the motor organs of this one.
- a deformable membrane 4 is clamped between the crown and the frame.
- the pumping chamber 5 is thus delimited by the ring 1, the flange 2 and the membrane 4.
- a valve box 6 constitutes the connection means of the pumping chamber 5 to a suction pipe, not shown, through at least one unidirectional valve passing from the direction A.
- the discharge of the pump also comprises a valve box 7 with a unidirectional valve whose tail 8 is seen, also passing in the direction A.
- the membrane 4 is driven by a race suction in the direction B and a discharge stroke in the direction C by means of a hydraulic fluid contained in a chamber of Work 9 which also includes a conventional device 10 for compensating leaks.
- the flange 2 is pierced with two orifices 22 and 23 which open into the chamber 5, for the one 22, in the lower part of the chamber at the boundary of the zone Z and for the other, in the upper part of the chamber, also at the edge of the zone Z. It is thus possible to introduce between the sheet 20 and the flange 2 a film of incompressible liquid, for example oil from the lower orifice 22.
- the liquid is forced by means of a pump into this space so as to cause progressive invasion until it comes out of the The upper orifice 23. It is thus certain to have driven out all the interstitial air that remained between the sheet and the flange. These openings are then plugged.
- the pump is then able to operate without loss of displacement and without mechanical stress and fatigue for the sheet 20.
- the lower orifice 22 is adapted to receive a threaded plug provided with an O-ring seal 31 and a central channel 32 which opens through a transverse channel 32a in a section 22a of the orifice 22.
- This section communicates with the final section 22b of this orifice 22 through a seat (shrink) 22c which can be closed by the conical end 30a of the threaded cap 30.
- the free end of this plug has a six maneuvering faces 30b surmounted by a fir-tail connecting end 30c for the temporary connection of the orifice 22 to a source of pressurized fluid not shown.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
L'invention concerne une pompe pour le dosage d'un produit extrêmement corrosif.The invention relates to a pump for the dosing of an extremely corrosive product.
Une telle pompe comporte de manière classique une tête de pompe qui définit une chambre de pompage, c'est-à-dire une chambre à volume variable par déformation ou déplacement d'une paroi de la tête. Cette chambre est solidaire d'un bâti qui supporte la tête de pompe et les organes moteurs attelés à la paroi mobile ou déformable.Such a pump conventionally comprises a pump head which defines a pumping chamber, that is to say a variable volume chamber by deformation or displacement of a wall of the head. This chamber is secured to a frame that supports the pump head and the driving members coupled to the movable or deformable wall.
Quand cette paroi est un piston, les organes moteurs sont formés par un embiellage reliant le piston à un vilebrequin à excentrique unique. Quand cette paroi est une membrane, ce qui est le cas principalement concerné par l'invention, les organes moteurs sont soit une transmission mécanique directe du genre embiellage, soit une transmission hydraulique avec une chambre de travail d'un côté de la membrane pleine d'un fluide hydraulique animé d'un mouvement cyclique par un piston moteur qui pousse ce fluide vers la membrane, sous pression, en diminuant le volume de la chambre de pompage, (refoulement de la pompe) ou qui l'aspire en déplaçant la membrane en sens inverse, donc en augmentant le volume de la chambre de pompage (aspiration de la pompe).When this wall is a piston, the drive members are formed by a linkage connecting the piston to a single eccentric crankshaft. When this wall is a membrane, which is the case mainly concerned by the invention, the drive members are either a direct mechanical transmission of the type linkage, or a hydraulic transmission with a working chamber on one side of the membrane full of a hydraulic fluid driven by a cyclic movement by a motor piston which pushes this fluid towards the membrane, under pressure, by reducing the volume of the pumping chamber (pump discharge) or by sucking it by moving the membrane in the opposite direction, thus increasing the volume of the pumping chamber (suction of the pump).
La tête de pompe comporte un orifice d'admission et un orifice de refoulement, chacun pourvu d'au moins un clapet unidirectionnel de sorte que le fluide circule dans un seul sens dans la chambre de pompage. Les clapets sont maintenus solidaires mais démontables de la tête de pompe par des boîtes à clapets.The pump head has an inlet port and a discharge port, each provided with at least one unidirectional valve so that the fluid flows in a single direction in the pumping chamber. The valves are held together but removable from the pump head by valve boxes.
L'agressivité du fluide pompé conduit à l'emploi de matériaux nobles pour les pièces en contact avec le fluide: aciers inoxydables, alliages spéciaux, titane, etc. qui sont particulièrement coûteux.The aggressiveness of the pumped fluid leads to the use of noble materials for the parts in contact with the fluid: stainless steels, special alloys, titanium, etc. which are particularly expensive.
La structure la plus fréquente d'une tête de pompe consiste en une pièce en forme de disque épais, creusée pour définir une calotte concave qui forme la chambre de pompage sur laquelle sont implantées les boîtes à clapets. Cette calotte est refermée par la membrane, pincée entre la pièce et le bâti de la pompe.The most common structure of a pump head consists of a thick disk-shaped piece, hollowed out to define a concave cap that forms the pumping chamber on which the valve boxes are implanted. This cap is closed by the membrane, pinched between the workpiece and the frame of the pump.
La pièce creusée est une pièce qui offre une surface importante au contact du fluide pompé. C'est en outre une pièce massive qui, lorsqu'il faut la réaliser en matériau hautement inattaquable chimiquement, revient extrêmement cher.The hollow part is a part that offers a large surface in contact with the pumped fluid. It is also a massive piece that, when it must be made of highly chemically unassailable material, is extremely expensive.
On a pensé au revêtement de la surface de cette pièce tournée vers la chambre de pompage au moyen, soit d'une sorte de vulcanisation (voir
Le préambule de la revendication indépendante 1 est basé sur le document
Aucune de ces solutions ne convient : la première parce qu'il n'existe aucune matière chimiquement neutre qui puisse former un revêtement solidement attaché par collage ou tout autre procédé d'adhésion surfacique en regard des contraintes de pression dépression existant dans une chambre de pompage, la seconde parce qu'il n'est pas possible de résister à ces contraintes par un seul agrafage d'une peau à un corps de tête de pompage. En outre pour ce dernier cas de figure, la conformation de la peau par moulage par exemple, ne peut ni être parfaitement congruente avec la surface du corps exposée dans la chambre de pompage, ni être suffisamment régulière pour qu'il n'existe pas des poches de gaz entre le corps et la peau qui se dilatent et se contractent à chaque cycle de pompage, diminuant la cylindrée de cette pompe.None of these solutions is appropriate: the first because there is no chemically neutral material that can form a firmly bonded coating by bonding or any other method of adhesion surface against vacuum pressure constraints existing in a pumping chamber the second because it is not possible to resist these constraints by a single stapling of a skin to a pumping head body. Furthermore, for the latter case, the conformation of the skin by molding, for example, can neither be perfectly congruent with the surface of the body exposed in the pumping chamber nor be sufficiently regular. so that there are no pockets of gas between the body and the skin that expand and contract each pump cycle, decreasing the displacement of this pump.
L'invention se propose de résoudre la question de la passivation de cette surface exposée au fluide pompé, en proposant un revêtement de cette surface au moyen d'une peau parfaitement coaptée à la forme de la surface à protégée de manière qu'aucune dégradation d'origine mécanique ou par suite d'une fatigue au fil du temps, ne puisse affecter cette protection.The invention proposes to solve the question of the passivation of this surface exposed to the pumped fluid, by proposing a coating of this surface by means of a skin perfectly coapted to the shape of the surface to be protected so that no degradation of mechanical origin or as a result of fatigue over time, can not affect this protection.
L'invention a donc pour objet une pompe notamment pour fluide chimiquement réactif, dans laquelle une tête de pompe comporte au moins deux parois entre lesquelles est définie une chambre de pompage du fluide considéré, l'une des parois étant fixe, l'autre étant mobile ou déformable par rapport à la paroi fixe au moyen d'un dispositif d'entraînement ou de déformation, la paroi fixe au moins étant pourvue d'un revêtement de protection à l'égard du fluide, caractérisée en ce que le revêtement est constitué par une feuille en matière plastique, plaquée de manière étanche contre la surface à la périphérie de celle-ci, l'espace compris entre la surface protégée et la feuille de revêtement, à l'intérieur de la ligne de leur contact étanche étant rempli d'un liquide incompressible.The subject of the invention is therefore a pump, in particular for chemically reactive fluid, in which a pump head comprises at least two walls between which is defined a pumping chamber for the fluid in question, one of the walls being fixed, the other being movable or deformable with respect to the fixed wall by means of a driving or deformation device, the at least one fixed wall being provided with a protective coating with respect to the fluid, characterized in that the coating consists of by a sheet of plastic material, sealingly pressed against the surface at the periphery thereof, the space between the protected surface and the covering sheet, within the line of their sealing contact being filled with an incompressible liquid.
Le matériau composite formé du liquide et de la feuille de matière plastique constitue un matériau indéformable sous l'effet des pressions et dépressions alternées qui règnent dans la chambre. En effet, le liquide ayant rempli totalement l'espace entre la surface et la feuille a chassé toute bulle de gaz qui aurait pu, par sa compressibilité donc la variation de son volume, laisser une liberté de déformation à la feuille par rapport à la paroi qu'elle protège, déformation qui aurait amoindri la cylindrée de la pompe et qui aurait constitué une contrainte de fatigue de la feuille conduisant rapidement à son déchirement.The composite material formed of the liquid and the plastic sheet is a non-deformable material under the effect of alternating pressures and depressions that prevail in the chamber. Indeed, the liquid having completely filled the space between the surface and the sheet has chased away any bubble of gas which could, by its compressibility and therefore the variation of its volume, leave a freedom of deformation to the sheet with respect to the wall which it protects, deformation which would have reduced the cubic capacity of the pump and which would have constituted a stress of fatigue of the sheet leading quickly to its tearing.
Cette disposition présente en outre un grand intérêt au niveau de la fabrication. En effet, on sait que par usinage courant, on ne peut pas obtenir un état de surface extrêmement poli de la surface du flasque. En outre, il est impossible de maîtriser la forme de la feuille (par exemple en calotte sphérique) avec les procédés de fabrication connus. Il existera toujours des irrégularités de courbures qui formeront des bosses et des creux en regard de la surface du flasque donc des poches de gaz, surtout si les dimensions de la pompe sont importantes (300 à 450 mm de diamètre extérieur de la tête de pompe par exemple). L'invention permet de s'affranchir de la nécessité de maîtriser avec précision les formes et les états de surfaces des flasque et feuille. Elle autorise donc une fabrication bon marché.This arrangement is also of great interest at the level of manufacture. Indeed, it is known that by current machining, it is not possible to obtain an extremely polished surface state of the surface of the flange. In addition, it is impossible to control the shape of the sheet (for example spherical cap) with the known manufacturing processes. There will always be irregularities of curvature which will form bumps and hollows facing the surface of the flange and therefore pockets of gas, especially if the dimensions of the pump are important (300 to 450 mm outside diameter of the pump head by example). The invention eliminates the need to accurately control the shapes and surface conditions of the flange and sheet. It allows cheap manufacturing.
Par ailleurs, plus la résistance à un allongement surfacique de la feuille de protection est grande, et moins le liquide sera sensible aux variations de pression dans la chambre de pompage. En conséquence, les zones d'étanchéité seront moins sollicitées et les risques de fuite, même au travers de joints ou clapets d'excellente qualité, seront moindres, avec comme avantage une plus longue longévité de la pompe.Furthermore, the greater the resistance to a surface elongation of the protective sheet is large, and the less the liquid will be sensitive to pressure variations in the pumping chamber. Consequently, the sealing zones will be less stressed and the risks of leakage, even through joints or valves of excellent quality, will be lower, with the advantage of a longer service life of the pump.
Cette résistance surfacique peut être conférée à la feuille d'au moins deux manières différentes.
La première consiste à conformer la feuille en calotte sensiblement sphérique ou conique, en congruence avec la surface interne du flasque pour l'épouser le plus exactement possible, avec la convexité de cette forme tournée vers l'intérieur de la chambre.This surface resistance can be imparted to the sheet in at least two different ways.
The first is to conform the sheet substantially spherical or conical cap, in congruence with the inner surface of the flange to marry it as accurately as possible, with the convexity of this shape facing the interior of the chamber.
La seconde consiste à mettre en place une plaque de protection de la surface de la feuille tournée du côté de la chambre de pompage, plaque de protection en matériau noble présentant une bonne résistance à la corrosion.
La pompe est enfin équipée des moyens pour procéder de manière simple et correcte au montage de la feuille de protection, soit au moment de l'assemblage initial de la pompe, soit au moment des remontages de celle-ci après des opérations régulières de maintenance. Il s'agit de deux orifices dont est équipé le flasque, débouchant à proximité immédiate de la ligne d'étanchéité entre la feuille et la tête de pompe, l'un dans la partie la plus basse et l'autre dans la partie la plus haute de la chambre de pompage, chacun comportant un bouchon fileté pour sa fermeture. Un capot de protection du bouchon recouvre chacun d'eux et repose sur une surface externe du flasque par une face d'appui comportant un joint torique d'étanchéité entourant le bouchon et logé dans une gorge à fond conique, permettant la dilatation radiale de ce joint sous l'effet d'un fluide sous pression issu du bouchon et la création d'une fuite de ce fluide entre le capot et le flasque.The second is to set up a protective plate of the surface of the sheet turned on the side of the pumping chamber, protective plate of noble material having good corrosion resistance.
The pump is finally equipped with means for proceeding in a simple and correct way to the mounting of the protective sheet, either at the time of initial assembly of the pump, or at the time of reassembly thereof after regular maintenance operations. These are two orifices which is equipped with the flange, opening in the immediate vicinity of the sealing line between the sheet and the pump head, one in the lowest part and the other in the most important part. top of the pumping chamber, each having a threaded plug for closure. A protective cap of the cap covers each of them and rests on an outer surface of the flange by a bearing face having a sealing O-ring surrounding the plug and housed in a conical bottom groove, allowing the radial expansion of this seal under the effect of a fluid under pressure from the cap and the creation of a leakage of this fluid between the cover and the flange.
D'autres caractéristiques et avantages de l'invention ressortiront de la description donnée ci-après à titre d'exemple d'un mode de sa réalisation.Other features and advantages of the invention will emerge from the description given below by way of example of a mode of its realization.
Il sera fait référence aux dessins annexés parmi lesquels :
- la
figure 1 est une vue en coupe axiale de la tête de pompage d'une pompe à membrane selon l'invention, - la
figure 2 est une vue en coupe axiale d'un détail de la tête de lafigure 1 et - la
figure 3 illustre un autre détail de cette tête.
- the
figure 1 is an axial sectional view of the pumping head of a diaphragm pump according to the invention, - the
figure 2 is an axial sectional view of a detail of the head of thefigure 1 and - the
figure 3 illustrates another detail of this head.
La tête de pompe représentée à la
On comprend au vu de ce dessin que le flasque 3 constitue la pièce qui offre la plus grande surface de contact avec le fluide pompé. Afin de supprimer le contact direct du flasque 3 avec le fluide, on dispose un revêtement 20 sur la surface du flasque tournée vers la chambre de pompage 5. Ce revêtement sera de préférence une feuille de polytétrafluorure d'éthylène (PTFE) d'une épaisseur comprise entre 1 et 5 mm. Pour des pompes de diamètre de l'ordre de 400mm par exemple, l'épaisseur retenue sera de 4 mm. Le PTFE est un matériau rigide de sorte que qu'une épaisseur significative lui confère une indéformabilité qui est intéressante pour obtenir un bon comportement de la pompe dans le temps.It is understood from this drawing that the
Dans le cas de la figure, la feuille 20, obtenue par compression-moulage, est en forme de calotte sphérique pour épouser la surface 21 du flasque 2 de même forme. La feuille 20 est pincée entre la couronne 1 et la flasque 2 par une zone périphérique Z de sorte que son contact dans cette zone avec la surface 21 est un contact étanche (de même d'ailleurs qu'avec la couronne 1). La forme en calotte de la feuille constitue en facteur géométrique supplémentaire de sa résistance à la déformation engendrée par les variations de pression dans la chambre 5.In the case of the figure, the
Le flasque 2 est percé de deux orifices 22 et 23 qui débouchent dans la chambre 5, pour l'un 22, en partie inférieure de la chambre à la limite de la zone Z et pour l'autre, en partie supérieure de la chambre, également à la limite de la zone Z. Il est ainsi possible d'introduire entre la feuille 20 et le flasque 2 un film de liquide incompressible, par exemple d'huile à partir de l'orifice inférieur 22. On force au moyen d'une pompe le liquide dans cet espace de manière à en provoquer l'invasion progressive jusqu'à ce qu'il ressorte par l'orifice supérieur 23. On est ainsi certain d'avoir chassé la totalité de l'air interstitiel qui demeurait entre la feuille et le flasque. On procède ensuite au bouchage de ces orifices. La pompe est alors en état de fonctionner sans perte de cylindrée et sans sollicitation mécanique et de fatigue pour la feuille 20.The
Aux
L'orifice inférieur 22 est apte à recevoir un bouchon fileté pourvu d'un joint torique d'étanchéité 31 et d'un canal central 32 qui débouche par un canal transversal 32a dans une section 22a de l'orifice 22. Cette section communique avec la section finale 22b de cet orifice 22 au travers d'un siège (rétrécissement) 22c qui peut être obturé par l'extrémité conique 30a du bouchon fileté 30. L'extrémité libre de ce bouchon possède un six pans de manoeuvre 30b surmonté d'un embout de connexion à queue de sapin 30c pour le raccordement temporaire de l'orifice 22 à une source de fluide pressurisé non représentée.The
On comprend que lorsque l'espace entre le flasque et la feuille est totalement rempli, il suffit à l'opérateur de visser le bouchon à fond pour faire porter l'extrémité conique 30a de ce dernier contre le siège 22c, extrémité qui en avait été auparavant maintenue éloignée par un vissage partiel du bouchon dans l'orifice afin de permettre le passage du fluide de gavage.It is understood that when the space between the flange and the sheet is completely filled, it is sufficient for the operator to screw the cap fully to bear the tapered end 30a of the latter against the seat 22c, which end had been previously kept away by a partial screwing of the plug in the orifice to allow the passage of the force-feeding fluid.
Pour ce qui concerne l'orifice 23, un autre bouchon fileté 35 est mis en place. Dans une version basique non représentée, ce bouchon est une simple vis pointeau (avec canaux central et transversal comme pour le bouchon 30) qui vient boucher le rétrécissement 23c de cet orifice. Dans la version représenté, le bouchon 35 comporte une extrémité 35a en forme de cône de centrage pour une bille 36 qui peut ainsi être plaquée contre le siège 23c par le bouchon ou qui peut, avec un vissage partiel, être libre entre ce siège et le cône de centrage. L'intérêt de cette structure est qu'une fois le gavage achevé, on ferme le bouchon de l'alimentation et on actionne la pompe sur quelques cycles d'aspiration/refoulement pour totalement dégazer l'espace entre le flasque et la feuille. La bille joue alors le rôle d'un clapet anti-retour qui permet au fluide ou gaz d'échapper à chaque course de refoulement tout en fermant le canal 23 pendant chaque course d'aspiration. Ces quelques cycles accomplis, on serre le bouchon 35 qui obture totalement l'orifice 23.As regards the
Il faut noter enfin sur chacune de ces figures, la présence d'un capot 40 qui vient recouvrir l'embout 30c, 35c de chaque bouchon pour le protéger des coups et salissures extérieures. La particularité de ce capot réside dans le fait qu'il est serré contre la face extérieure du flasque 2 de manière étanche grâce à un joint torique 41 qui est logé dans une gorge (ou lamage) 42 à fond 43 conique. Au moment du montage du capot, le joint est légèrement comprimé entre le flasque 2 et le fond 43 de la gorge. Si une fuite se produit au niveau du bouchon capoté, le fluide accumulé dans le bouchon tend sous la pression croissante à chaque coup de pompe, d e repousser vers l'extérieur le joint 41. Celui-ci est prévu pour se dilater et donc occuper un endroit de la gorge où sa compression disparaît du fait de la conicité du fond 43 de la gorge. Une fuite du liquide est alors possible, ce qui est un signe d'alarme pour l'opérateur et surtout qui empêche au fluide sous pression de faire sauter le capot et ainsi faire disparaître la protection des embouts de bouchon.Finally, it should be noted in each of these figures, the presence of a
Aux
Claims (5)
- A pump, in particular for a chemically reactive fluid, in which a pump head comprises at least two walls (2, 4) between which there is defined a pump chamber (5) for pumping the fluid in question, one of the walls (2) being stationary, the other wall (4) being movable or deformable relative to the stationary wall (2) by means of a drive or deformation device (9), at least the stationary wall (2) being provided with a protective coating (20) against the fluid, constituted by a sheet (20) of plastics material applied in leaktight manner against the stationary wall (2) at the periphery (Z) thereof, characterized in that the space between the protected surface (21) and the coating sheet (20), within the zone (Z) where they make leaktight contact, is filled with an incompressible liquid.
- A pump according to claim 1, characterized in that the sheet (20) is in the shape of a substantially spherical or conical cap complementary to the inside surface (21) of the side plate (2) so as to fit against it as closely as possible, with the convex side of this shape facing towards the inside of the chamber (5).
- A pump according to claim 1, characterized in that it has a protective plate (20b) for protecting the surface of the sheet (20a) that faces towards the pump chamber.
- A pump according to any preceding claim, characterized in that it includes means for filling the space between the side plate (2) and the sheet (20, 20a) with fluid, which means are constituted by two orifices (22, 23), formed in the side plate (2) and opening out in the immediate proximity of the leaktight zone (Z) between the sheet (20, 20a) and the pump head, one of the orifices (22) being in the lowest portion and the other orifice (23) being in the highest portion of the pump chamber (5), and each orifice having a threaded plug (30, 35) for closing it.
- A pump according to any preceding claim, characterized in that each of the plugs (30, 35) is protected by a respective cap (40) resting against an outside surface of the side plate (2) via a bearing face that includes an O-ring (41) surrounding the plug (30, 35) and received in a groove (42) having a conical bottom (43) that enables the O-ring (41) to expand radially under the effect of fluid under pressure coming from the plug, thereby creating a leak of said fluid between the cap (40) and the side plate (2).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0701786A FR2913732B1 (en) | 2007-03-13 | 2007-03-13 | MEMBRANE-ASSISTED DOSING PUMP OF ONE OF ITS WALLS OR EXTENT FLAG OF THE DOSING CHAMBER |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1972783A1 EP1972783A1 (en) | 2008-09-24 |
EP1972783B1 true EP1972783B1 (en) | 2010-05-12 |
Family
ID=38581918
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08290218A Expired - Fee Related EP1972783B1 (en) | 2007-03-13 | 2008-03-06 | Dispensing pump with an isolating membrane of one of its walls or end flange of the dispensing chamber |
Country Status (5)
Country | Link |
---|---|
US (1) | US7836814B2 (en) |
EP (1) | EP1972783B1 (en) |
DE (1) | DE602008001184D1 (en) |
ES (1) | ES2344489T3 (en) |
FR (1) | FR2913732B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112309150B (en) * | 2020-12-07 | 2021-12-28 | 吉安市永安交通设施有限公司 | Movable traffic signal lamp |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2496711A (en) * | 1946-11-02 | 1950-02-07 | Daniel And Florence Guggenheim | Pumping apparatus for very cold liquids |
US2753804A (en) * | 1951-09-26 | 1956-07-10 | Int Paper Box Machine Co | Diaphragm pump |
US3000320A (en) * | 1957-07-18 | 1961-09-19 | Ring Sandiford | Pump |
US3212448A (en) * | 1963-04-22 | 1965-10-19 | Clevite Corp | Fluid apparatus |
US3781141A (en) * | 1971-07-12 | 1973-12-25 | Dorr Oliver Inc | Air pressure actuated single-acting diaphragm pump |
GB1433758A (en) * | 1973-10-23 | 1976-04-28 | Hamilton T W | Membrane pump |
DE8525733U1 (en) * | 1985-09-10 | 1987-01-15 | Becker, Erich, 7812 Bad Krozingen | Diaphragm pump |
DE10012902B4 (en) * | 2000-03-16 | 2004-02-05 | Lewa Herbert Ott Gmbh + Co. | Breathable membrane clamping |
-
2007
- 2007-03-13 FR FR0701786A patent/FR2913732B1/en active Active
-
2008
- 2008-03-06 ES ES08290218T patent/ES2344489T3/en active Active
- 2008-03-06 EP EP08290218A patent/EP1972783B1/en not_active Expired - Fee Related
- 2008-03-06 DE DE602008001184T patent/DE602008001184D1/en active Active
- 2008-03-12 US US12/046,917 patent/US7836814B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE602008001184D1 (en) | 2010-06-24 |
FR2913732A1 (en) | 2008-09-19 |
FR2913732B1 (en) | 2012-08-17 |
EP1972783A1 (en) | 2008-09-24 |
US7836814B2 (en) | 2010-11-23 |
ES2344489T3 (en) | 2010-08-27 |
US20080226478A1 (en) | 2008-09-18 |
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