EP0066522B2 - Hydraulically actuated diaphragm pump - Google Patents

Hydraulically actuated diaphragm pump Download PDF

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Publication number
EP0066522B2
EP0066522B2 EP82401008A EP82401008A EP0066522B2 EP 0066522 B2 EP0066522 B2 EP 0066522B2 EP 82401008 A EP82401008 A EP 82401008A EP 82401008 A EP82401008 A EP 82401008A EP 0066522 B2 EP0066522 B2 EP 0066522B2
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EP
European Patent Office
Prior art keywords
diaphragm
pump
elements
beads
membrane
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Expired - Lifetime
Application number
EP82401008A
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German (de)
French (fr)
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EP0066522A1 (en
EP0066522B1 (en
Inventor
Max-Albert Malizard
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Dosapro Milton Roy SA
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Dosapro Milton Roy SA
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Application filed by Dosapro Milton Roy SA filed Critical Dosapro Milton Roy SA
Priority to AT82401008T priority Critical patent/ATE10964T1/en
Publication of EP0066522A1 publication Critical patent/EP0066522A1/en
Application granted granted Critical
Publication of EP0066522B1 publication Critical patent/EP0066522B1/en
Publication of EP0066522B2 publication Critical patent/EP0066522B2/en
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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
    • F04B43/0009—Special features
    • F04B43/0081—Special features systems, control, safety measures
    • F04B43/009—Special features systems, control, safety measures leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid

Definitions

  • the present invention intends to remedy these drawbacks by proposing a pump which, by its membrane and the mounting thereof, has the qualities necessary for the removal of the above uncertainties and hazards.
  • French patent No. 581223 discloses a rubber membrane for a pump, the two faces of which are in contact with two different fluids, this membrane forming a substantially spherical cup which has a substantially planar outer annular edge.
  • a membrane for a vacuum pump is also known, which is made up of two layers, one made of rubber and the other of a tetrafluoroethylene.
  • membranes are also used, for example in mechanically actuated pumps, which have peripheral fixing beads and a layer of tetrafluoroethylene.
  • the subject of the invention is a hydraulically controlled diaphragm pump comprising at least one diaphragm, the two faces of which are in contact with two different fluids, this diaphragm forming a substantially spherical cup which comprises a substantially planar outer annular edge, the body of pump comprising at least two elements between which the membrane is tightened, in which pump said membrane is constituted by two layers, one in rubber and the other in plastic material such as a tetrafluoroethylene, the other aforesaid layer is on the side concave, each of the faces of said edge is provided with a bead for fixing the membrane in the pump body, between the two aforementioned elements, each of said elements is provided with a toric groove for receiving the aforementioned beads, while the approximation elements at the end of tightening is limited to approximately 80% of the total thickness of the membrane at its beads, the tightening being carried out only on the beads.
  • the depth of the interior spherical cup prefferably be of the order of 4 to 6% of the interior diameter of said annular edge.
  • a membrane according to the invention constituted by a spherical cap 1 of diameter D surrounded by an annular rim 2 substantially planar of width E.
  • This cap 1 and this rim 2 are in one piece and consist of a composite material whose thickest layer 3 is made of rubber (natural or synthetic) and whose thinnest layer 4 is formed on the concave side 1 a by a plastic material, in particular by a tetrafluoroethylene.
  • a plastic material in particular by a tetrafluoroethylene.
  • the proportion in thickness of the two components is about 0/5 Rubber and 1/5 for tetrafluoroethylene.
  • the depth of the spherical cap F (or the arrow thereof in the cutting plane) is between 0.04 and 0.06 D.
  • the rim 2 has on each of its faces a bead 2a and 2b consisting substantially of a half-torus whose radius R is of the order of the thickness of the membrane.
  • R radius
  • Fig. 2 schematically illustrates a double diaphragm pump with hydraulic control.
  • the control chamber 5 is associated in a known manner with a piston 6 and with a compensation device 7.
  • a first membrane 8 isolates this chamber from an intermediate chamber 9, itself even isolated by a second membrane 10 from the pumping chamber 11.
  • the membranes 8 and 10 are coupled, as shown in detail in FIG. 2A, by pinching between elements 12a, 12b, 12c of the pump body. These elements are frontally provided with toric grooves 13 to receive the beads 2a, 2b of the membranes.
  • the elements 12a, 12b, 12c as well as the grooves 13 have dimensions such that, on the one hand, the crushing of the beads 2a, 2b does not exceed 20% of the dimension E (see fig. 1) of the membrane at this point and that, on the other hand, the rest of the membrane located between the above elements is not pinched.
  • the membranes are embedded only at the level of the beads which cooperate with the elements 12a to 12c in the manner of O-rings to seal between the chambers 5, and 11.
  • the advantages of the invention lie in the fact that a pump equipped with the above-described membrane has, for equal diameter, a greater capacity.
  • the longevity of the membrane is increased and its operating performance improved.
  • the tightness ensured during assembly is better (similar to that of the O-ring) with a clamping force lower than that usually practiced on conventional pumps.
  • the intermediate volume is much better defined by the membranes according to the invention and can be much better filled.
  • the invention finds an interesting application in the field of hydraulically controlled diaphragm pumps, and in particular metering pumps.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

1. Diaphragm for hydraulically-controlled diaphragm pump of which two faces are in contact with two different fluids, said diaphragm forming a cup-shaped member (1) which is substantially spherical and comprises an annular outer edge (2) substantially plane, said diaphragm being characterised in that it is constituted in a manner known per se, by two layers, one (3) in rubber and the other (4) in plastic material such as tetrafluor-ethylene and in that each of the faces of said edge is provided with a bead (2a, 2b) by which the diaphragm is secured in the pump body.

Description

Il est habituel de mettre en oeuvre, dans les pompes à membranes à commande hydraulique, des membranes planes composites dont on pince le bord de manière étanche entre deux pièces mobiles du corps.It is usual to use, in hydraulically controlled diaphragm pumps, composite flat membranes, the edge of which is clamped tightly between two moving parts of the body.

Lorsque, en position de repos, la membrane pincée est plane, elle travaille en extension, ce qui à la longue entraîne une déformation permanente. Cette déformation est, dans la pratique, aléatoire et constitue une incertitude quant au fonctionnement de la pompe.When, in the rest position, the pinched membrane is flat, it works in extension, which in the long term causes permanent deformation. This deformation is, in practice, random and constitutes uncertainty as to the operation of the pump.

Pour remédier à l'inconvénient d'une telle déformation, on met parfois en place une membrane de diamètre extérieur supérieur au diamètre de montage dans la pompe. Il se produit alors un flambage qui crée une incertitude quant à la position de la membrane au repos.To remedy the drawback of such a deformation, a membrane with an outside diameter greater than the mounting diameter is sometimes installed in the pump. Buckling then occurs which creates uncertainty as to the position of the membrane at rest.

Ces déformations, voulues ou non, ont également une incidence sur le fonctionnement des systèmes de compensation commandée qui peut comporter des aléas indésirables. Elles constituent un problème important pour les pompes à double membrane. Il est en effet difficile de remplir correctement l'espace intermédiaire (entre les deux membranes) délimité par des membranes déformées de manière aléatoire.These deformations, whether desired or not, also have an impact on the operation of controlled compensation systems which may include undesirable hazards. They are a major problem for double diaphragm pumps. It is indeed difficult to correctly fill the intermediate space (between the two membranes) delimited by randomly deformed membranes.

Enfin le serrage de la membrane sur sa périphérie entraîne un affaiblissement de cette dernière à ce niveau, afaiblissement qui peut se traduire par une déchirure ou du moins par une longévité moins importante.Finally, the tightening of the membrane on its periphery leads to a weakening of the latter at this level, weakening which can result in a tear or at least in a less important longevity.

La présente invention entend remédier à ces inconvénients en proposant une pompe qui, par sa membrane et le montage de celle-ci, présente les qualités nécessaires à la supression des incertitudes et des aléas susdits.The present invention intends to remedy these drawbacks by proposing a pump which, by its membrane and the mounting thereof, has the qualities necessary for the removal of the above uncertainties and hazards.

Par le brevet français No 581223, on connaît une membrane en caoutchouc pour pompe dont les deux faces sont au contact de deux fluides différents, cette membrane formant une coupelle sensiblement sphérique qui comporte un bord annulaire extérieur sensiblement plan.French patent No. 581223 discloses a rubber membrane for a pump, the two faces of which are in contact with two different fluids, this membrane forming a substantially spherical cup which has a substantially planar outer annular edge.

Par le brevet français No 1547601, on connaît également une membrane pour pompe à vide, qui est constituée par deux couches, l'une en caoutchouc et l'autre en un tétrafluoréthylène.From French patent No. 1547601, a membrane for a vacuum pump is also known, which is made up of two layers, one made of rubber and the other of a tetrafluoroethylene.

Par le brevet US No 3771907, on connaît une membrane pour pompe à boisson mue mécaniquement, cette membrane étant fixée dans le corps de pompe par un bourrelet faisant saillie sur chacune des faces du bord annulaire de cette membrane.From patent US Pat. No. 3,771,907, a membrane for a mechanically driven beverage pump is known, this membrane being fixed in the pump body by a bead projecting from each of the faces of the annular edge of this membrane.

En outre, on utilise également des membrane, par exemple dans des pompes actionnées mécaniquement, qui possèdent des bourrelets périphériques de fixation et une couche de tétrafluoréthylène.In addition, membranes are also used, for example in mechanically actuated pumps, which have peripheral fixing beads and a layer of tetrafluoroethylene.

L'invention cependant a pour objet une pompe à membrane à commande hydraulique comportant au moins une membrane dont les deux faces sont au contact de deux fluides différents, cette membrane formant une coupelle sensiblement sphérique qui comporte un bord annulaire extérieur sensiblement plan, le corps de pompe comportant au moins deux éléments entre lesquels la membrane est serrée, dans laquelle pompe ladite membrane est constituée par deux couches, l'une en caoutchouc et l'autre en matière plastique telle qu'un tétrafluoréthylène, l'autre couche susdite est du côté concave, chacune des faces dudit bord est pourvue d'un bourrelet de fixation de la membrane dans le corps de pompe, entre les deux éléments susdits, chacun desdits éléments est pourvu d'une gorge torique pour recevoir les bourrelets susdits, tandis que le rapprochement des éléments en fin de serrage est limité à 80% environ de l'épaisseur totale de la membrane au niveau de ses bourrelets, le serrage n'étant effectué que sur les bourrelets.The subject of the invention, however, is a hydraulically controlled diaphragm pump comprising at least one diaphragm, the two faces of which are in contact with two different fluids, this diaphragm forming a substantially spherical cup which comprises a substantially planar outer annular edge, the body of pump comprising at least two elements between which the membrane is tightened, in which pump said membrane is constituted by two layers, one in rubber and the other in plastic material such as a tetrafluoroethylene, the other aforesaid layer is on the side concave, each of the faces of said edge is provided with a bead for fixing the membrane in the pump body, between the two aforementioned elements, each of said elements is provided with a toric groove for receiving the aforementioned beads, while the approximation elements at the end of tightening is limited to approximately 80% of the total thickness of the membrane at its beads, the tightening being carried out only on the beads.

Il sera par ailleurs avantageux que la profondeur de la coupelle sphérique intérieure soit de l'ordre de 4 à 6% du diamètre intérieur dudit bord annulaire.It will also be advantageous for the depth of the interior spherical cup to be of the order of 4 to 6% of the interior diameter of said annular edge.

L'invention sera mieux comprise au cours de la description donnée ci-après à titre d'exemple purement indicatif et non limitatif, qui permettra d'en dégager les avantages et les caractéristiques secondaires.The invention will be better understood during the description given below by way of purely indicative and nonlimiting example, which will make it possible to identify the advantages and the secondary characteristics thereof.

Il sera fait référence aux dessins annexés dans lesquels:

  • la fig. 1 est une vue en coupe de la membrane selon l'invention;
  • les fig. 2 et 2A illustrent une pompe à double membrane dans laquelle la membrane est appliquée, la fig. 2A étant une vue grossie d'un détail de la fig. 2.
Reference will be made to the appended drawings in which:
  • fig. 1 is a sectional view of the membrane according to the invention;
  • fig. 2 and 2A illustrate a double diaphragm pump in which the diaphragm is applied, FIG. 2A being an enlarged view of a detail of FIG. 2.

Sur la fig. 1, on voit une membrane selon l'invention constituée par une calotte sphérique 1 de diamètre D entourée d'un rebord annulaire 2 sensiblement plan de largeur E.In fig. 1, we see a membrane according to the invention constituted by a spherical cap 1 of diameter D surrounded by an annular rim 2 substantially planar of width E.

Cette calotte 1 et ce rebord 2 sont en une seule pièce et constitués par un matériau composite dont la couche la plus épaisse 3 est en caoutchouc (naturel ou synthétique) et dont la couche la plus mince 4 est constituée du côté concave 1 a par une matière plastique, notamment par un tétrafluoréthylène. Dans le cas de la figure, la proportion en épaisseur des deux constituants est environ 0/ 5 pour le caoutchouc et 1/5 pour le tétrafluoréthylène.This cap 1 and this rim 2 are in one piece and consist of a composite material whose thickest layer 3 is made of rubber (natural or synthetic) and whose thinnest layer 4 is formed on the concave side 1 a by a plastic material, in particular by a tetrafluoroethylene. In the case of the figure, the proportion in thickness of the two components is about 0/5 Rubber and 1/5 for tetrafluoroethylene.

La profondeur de la calotte sphérique F (ou la flèche de celle-ci dans le plan de coupe) est comprise entre 0,04 et 0,06 D.The depth of the spherical cap F (or the arrow thereof in the cutting plane) is between 0.04 and 0.06 D.

Il faut remarquer enfin que le rebord 2 comporte sur chacune de ses faces un bourrelet 2a et 2b constitué sensiblement par une demi-tore dont le rayon R est de l'ordre de l'épaisseur de la membrane. Dans la pratique, on a constaté que, pour toutes les membranes d'une gamme, on pouvait adopter une valeur de R égale à 2,5 mm.Finally, it should be noted that the rim 2 has on each of its faces a bead 2a and 2b consisting substantially of a half-torus whose radius R is of the order of the thickness of the membrane. In practice, it has been found that, for all the membranes in a range, an R value equal to 2.5 mm could be adopted.

La fig. 2 illustre schématiquement une pompe à double membrane à commande hydraulique. La chambre de commande 5 est associée de manière connue à un piston 6 et à un dispositif de compensation 7. Une première membrane 8 isole cette chambre d'une chambre intermédiaire 9, elle-même isolée par une seconde membrane 10 de la chambre de pompage 11.Fig. 2 schematically illustrates a double diaphragm pump with hydraulic control. The control chamber 5 is associated in a known manner with a piston 6 and with a compensation device 7. A first membrane 8 isolates this chamber from an intermediate chamber 9, itself even isolated by a second membrane 10 from the pumping chamber 11.

Les membranes 8 et 10 sont attelées, comme le montre en détail la fig. 2A, par pincement entre des éléments 12a, 12b, 12c du corps de pompe. Ces éléments sont pourvus frontalement de gorges toriques 13 pour recevoir les bourrelets 2a, 2b des membranes.The membranes 8 and 10 are coupled, as shown in detail in FIG. 2A, by pinching between elements 12a, 12b, 12c of the pump body. These elements are frontally provided with toric grooves 13 to receive the beads 2a, 2b of the membranes.

Une fois serrés les uns contre les autres, les éléments 12a, 12b, 12c ainsi que les gorges 13 ont des dimensions telles que, d'une part, l'écrasement des bourrelets 2a, 2b n'excède pas 20% de la dimension E (voir fig. 1) de la membrane à cet endroit et que, d'autre part, le reste de la membrane situé entre les éléments susdits n'est pas pincé. Ainsi, les membranes sont encastrées uniquement au niveau des bourrelets qui coopèrent avec les éléments 12a à 12c à la manière de joints toriques pour assurer l'étanchéité entre les chambres 5, et 11.Once tightened against each other, the elements 12a, 12b, 12c as well as the grooves 13 have dimensions such that, on the one hand, the crushing of the beads 2a, 2b does not exceed 20% of the dimension E (see fig. 1) of the membrane at this point and that, on the other hand, the rest of the membrane located between the above elements is not pinched. Thus, the membranes are embedded only at the level of the beads which cooperate with the elements 12a to 12c in the manner of O-rings to seal between the chambers 5, and 11.

Les avantages de l'invention résident dans le fait qu'une pompe équipée de la membrane ci- dessus décrite possède, à diamètre égal, une plus grande capacité. En outre, la longévité de la membrane est accrue et sa tenue en fonctionnement améliorée. L'étanchéité assurée au montage est meilleure (analogue à celle du joint torique) avec un effort de serrage inférieur à celui habituellement pratiqué sur les pompes classiques. Enfin, dans l'application aux pompes à double membrane, le volume intermédiaire est beaucoup mieux défini par les membranes selon l'invention et peut être beaucoup mieux rempli.The advantages of the invention lie in the fact that a pump equipped with the above-described membrane has, for equal diameter, a greater capacity. In addition, the longevity of the membrane is increased and its operating performance improved. The tightness ensured during assembly is better (similar to that of the O-ring) with a clamping force lower than that usually practiced on conventional pumps. Finally, in the application to double diaphragm pumps, the intermediate volume is much better defined by the membranes according to the invention and can be much better filled.

L'invention trouve une application intéressante dans le domaine des pompes à membranes commandées hydrauliquement, et particulièrement des pompes doseuses.The invention finds an interesting application in the field of hydraulically controlled diaphragm pumps, and in particular metering pumps.

Claims (4)

1. Hydraulically controlled diaphragm pump having at least one diaphragm, the two sides of which are in contact with two different fluids, said diaphragm forming a cup-shaped member (1) which is substantially spherical, which comprises an annular outer edge (2) substantially plane, the pump body having at least two elements (12a, 12b) between which the diaphragm (10) is gripped, characterized in that said diaphragm is constituted by two layers, one (3) in rubber and the other (4) in plastic material such as tetrafluorethylene, in that said other layer (4) is on the internal side (1a), in that each face of said edge is provided with a bead (2a, 2b) for securing the diaphragm in the pump body between said two elements, in that each of said elements (12, 12b) is provided with a annular groove (13) to receive beads and in that the bringing together of the elements at the end of the tightening is limited to about 80% of the total thickness (E) of the diaphragm at the level of its beads, tightening being applied on the beads only..
2. Pump as claimed in claim 1, characterized in that the depth (F) of the internal spherical cup shaped member is between 4 to 6% of the inner diameter (D) of said annular edge.
3. Pump as claimed in claim 1 characterized in that the beads (2a, 2b) are substantially semi annular, of outer radius equal to 2.5 millimeters.
4. Pump as claimed in any one of the preceding claims characterized in that it comprises two diaphragms (8, 10).
EP82401008A 1981-06-02 1982-06-02 Hydraulically actuated diaphragm pump Expired - Lifetime EP0066522B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401008T ATE10964T1 (en) 1981-06-02 1982-06-02 DIAPHRAGM FOR A HYDRAULICALLY OPERATED DIAPHRAGM PUMP AND PUMP WITH ITS APPLICATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8110917A FR2506859B1 (en) 1981-06-02 1981-06-02 MEMBRANE FOR HYDRAULICALLY CONTROLLED PUMP AND APPLICABLE PUMP
FR8110917 1981-06-02

Publications (3)

Publication Number Publication Date
EP0066522A1 EP0066522A1 (en) 1982-12-08
EP0066522B1 EP0066522B1 (en) 1984-12-27
EP0066522B2 true EP0066522B2 (en) 1990-01-31

Family

ID=9259112

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401008A Expired - Lifetime EP0066522B2 (en) 1981-06-02 1982-06-02 Hydraulically actuated diaphragm pump

Country Status (4)

Country Link
EP (1) EP0066522B2 (en)
AT (1) ATE10964T1 (en)
DE (1) DE3261687D1 (en)
FR (1) FR2506859B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3714153A1 (en) * 1987-04-28 1988-12-01 Sergej Michajlovic Altuchov Diaphragm machine unit
DE102006044253B3 (en) * 2006-09-16 2008-03-27 Thomas Magnete Gmbh Membrane, for a hydraulic membrane pump for diesel exhaust cleaning, has a recess to define the exact delivery dose volume

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR581223A (en) * 1924-04-19 1924-11-25 Elastic diaphragm pump
FR1274473A (en) * 1960-08-04 1961-10-27 Pumps including piston, or diaphragm pumps
FR1373780A (en) * 1963-08-19 1964-10-02 Improvements to diaphragm pumps
DE1653369A1 (en) * 1966-10-20 1970-08-27 Erich Becker Diaphragm pump, especially for generating a vacuum with aggressive media
US3771907A (en) * 1971-09-13 1973-11-13 Reynolds Products Simplified positive displacement syrup pump assembly for drink machines

Also Published As

Publication number Publication date
FR2506859B1 (en) 1986-04-11
EP0066522A1 (en) 1982-12-08
FR2506859A1 (en) 1982-12-03
DE3261687D1 (en) 1985-02-07
EP0066522B1 (en) 1984-12-27
ATE10964T1 (en) 1985-01-15

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