EP0066522A1 - Hydraulically actuated diaphragm pump - Google Patents

Hydraulically actuated diaphragm pump Download PDF

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Publication number
EP0066522A1
EP0066522A1 EP82401008A EP82401008A EP0066522A1 EP 0066522 A1 EP0066522 A1 EP 0066522A1 EP 82401008 A EP82401008 A EP 82401008A EP 82401008 A EP82401008 A EP 82401008A EP 0066522 A1 EP0066522 A1 EP 0066522A1
Authority
EP
European Patent Office
Prior art keywords
membrane
diaphragm
beads
elements
pump
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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
EP82401008A
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German (de)
French (fr)
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EP0066522B2 (en
EP0066522B1 (en
Inventor
Max-Albert Malizard
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.)
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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Expired - Lifetime legal-status Critical Current

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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 new membrane.
  • a membrane for a diaphragm pump with hydraulic control the two faces of which are in contact with two different fluids, constituted by a cup of substantially spherical shape in rubber covered on one of its faces with a plastic layer and having a substantially planar outer annular edge.
  • each of the faces of said edge is provided with a bead for fixing the membrane in the pump body.
  • the depth of the inner spherical cap defined by the membrane prefferably be of the order of 4 to 6% of the inside diameter of said annular edge.
  • each of said elements is provided with an O-ring groove to receive the aforementioned beads and in that the bringing together of the elements at the end of tightening is limited to approximately 80% of the total thickness of the membrane at the level of its beads, the tightening being carried out only on the beads.
  • a membrane according to the invention constituted by a spherical cap 1 of diameter D surrounded by a substantially planar annular rim 2 of width e.
  • This cap 1 and this rim 2 are in one piece and consist of a composite material of which the thickest layer 3 and a rubber (natural or synthetic) and the thinnest layer 4 of which is constituted by a plastic material in particular by tetrafluoroethylene.
  • the thickness proportion of the two constituents is approximately 4/5 for rubber and 1/5 for tetrafluoroethylene.
  • the depth of the spherical cap F (or the arrow ' thereof in the cutting plane) is between 0.04D and 0.06D.
  • 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 of the thickness of the membrane.
  • 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 a compensation device 7.
  • a first membrane 8 isolates this chamber from an intermediate chamber 9 which is itself insulated by a second membrane 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 provided frontally 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 Figure 1) of the membrane at this location 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 chambers 5, 9 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 performance in operation improved.
  • the tightness ensured during assembly is better (similar to that of the O-ring) with a lower clamping force 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 particularly metering pumps.

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 composite diaphragm membranes in hydraulically controlled diaphragm pumps, the edge of which is clamped tightly between two moving parts of the body.

Lorsqu'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 the pinched membrane is flat in the rest position, 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. A 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 in- désirables. 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 i n - desirable 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 membranes deformed randomly.

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

La présente invention entend remédier à ces inconvénients en proposant une nouvelle membrane.The present invention intends to remedy these drawbacks by proposing a new membrane.

Elle a donc pour objet une membrane pour pompe à membrane à commande hydraulique, dont les deux faces sont au contact de deux fluides différents, constituée par une coupelle de forme sensiblement sphérique en caoutchouc recouverte sur l'une des ses faces d'une couche de matière plastique et comportant un bord annulaire extérieur sensiblement plan.It therefore relates to a membrane for a diaphragm pump with hydraulic control, the two faces of which are in contact with two different fluids, constituted by a cup of substantially spherical shape in rubber covered on one of its faces with a plastic layer and having a substantially planar outer annular edge.

En outre, chacune des faces dudit bord est pourvue d'un bourrelet de fixation de la membrane dans le corps de pompe.In addition, each of the faces of said edge is provided with a bead for fixing the membrane in the pump body.

Il sera par ailleurs avantageux que la profondeur de la calotte sphérique intérieure définie par la membrane soit de l'ordre de 4 à 6% du diamètre intérieur dudit bord annulaire.It will also be advantageous for the depth of the inner spherical cap defined by the membrane to be of the order of 4 to 6% of the inside diameter of said annular edge.

Elle concerne également la pompe adaptée pour recevoir ladite membrane dont le corps comporte au moins deux éléments entre lesquels la membrane est serrée. Cette pompe est remarquable en ce que chacun desdits éléments est pourvu d'une gorge torique pour recevoir les bourrelets susdits et en ce 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.It also relates to the pump adapted to receive said membrane, the body of which comprises at least two elements between which the membrane is clamped. This pump is remarkable in that each of said elements is provided with an O-ring groove to receive the aforementioned beads and in that the bringing together of the elements at the end of tightening is limited to approximately 80% of the total thickness of the membrane at the level of its beads, the tightening being carried out only on the beads.

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

Sur la figure 1 on voit une membrane selon l'invention constituée par une calotte sphérique 1 de diamètre D entourée d'un rebord annulaire sensiblement plan 2 de largeur e.In Figure 1 we see a membrane according to the invention constituted by a spherical cap 1 of diameter D surrounded by a substantially planar annular rim 2 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 et un caoutchouc (naturel ou synthétique) et dont la couche la plus mince 4 est constituée par une matière plastique notamment par du tetrafluoréthylène. Dans le cas de figure la proportion en épaisseur des deux constituants est environ 4/5 pour le caoutchouc et 1/5 pour le tetrafluoréthylène.This cap 1 and this rim 2 are in one piece and consist of a composite material of which the thickest layer 3 and a rubber (natural or synthetic) and the thinnest layer 4 of which is constituted by a plastic material in particular by tetrafluoroethylene. In the case of figure the thickness proportion of the two constituents is approximately 4/5 for 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 0,04D et 0,o6D.The depth of the spherical cap F (or the arrow ' thereof in the cutting plane) is between 0.04D and 0.06D.

Il faut remarquer enfin que le rebord 2 comporte sur chacune des ses faces un bourrelet 2a et 2b constitué sensiblement par un 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 millimètres.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, it is possible to adopt a value of R equal to 2.5 millimeters.

La figure 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 un dispositif de compensation 7. Une première membrane 8 isole cette chambre d'une chambre intermédiaire 9 elle-même isolée par une seconde membranelO 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 a compensation device 7. A first membrane 8 isolates this chamber from an intermediate chamber 9 which is itself insulated by a second membrane from the pumping chamber 11.

Les membranes 8 et 10 sont attelées comme le montre en détail la figure 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 provided frontally 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 figure 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 encastrés uniquement au niveau des bourrelets qui coopèrent avec les éléments 12a àl2c à la manière de joints toriques pour assurer l'étanchéité entre les chambres 5, 9 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 Figure 1) of the membrane at this location 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 chambers 5, 9 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. Enfi.n, 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 performance in operation improved. The tightness ensured during assembly is better (similar to that of the O-ring) with a lower clamping force 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 particularly metering pumps.

Claims (6)

1. Membrane pour pompe à membrane à commande hydraulique dont les deux faces sont au contact de deux fluides différents, constituée par deux matériaux différents à savoir : une base en caoutchouc recouverte sur l'une de ses faces d'une couche de matière plastique (4), caractérisée en ce qu'elle forme une coupelle (1) sensiblement sphérique qui comporte un bord annulaire (2) extérieur sensiblement plan.1. Membrane for a hydraulically operated diaphragm pump, the two sides of which are in contact with two different fluids, made up of two different materials, namely: a rubber base covered on one of its faces with a layer of plastic material ( 4), characterized in that it forms a substantially spherical cup (1) which has a substantially planar outer annular edge (2). 2. Membrane selon la revendication 1, caractérisée en ce que chacune des faces dudit bord est pourvue d'un bourrelet (2a, 2b) de fixation de la membrane dans le corps de pompe.2. Membrane according to claim 1, characterized in that each of the faces of said edge is provided with a bead (2a, 2b) for fixing the membrane in the pump body. 3. Membrane selon la revendication 1 ou la revendication 2, caractérisée en ce que la profondeur (F) de la calotte sphérique intérieure définie par la membrane est de l'ordre de 4 à 6 % du diamètre intérieur (D).3. Membrane according to claim 1 or claim 2, characterized in that the depth (F) of the inner spherical cap defined by the membrane is of the order of 4 to 6% of the inner diameter (D). 4. Membrane selon l'une quelconque des revendications précédentes, caractérisée en ce que la matière plastique susdite est un tetrafluoréthylène.4. Membrane according to any one of the preceding claims, characterized in that the aforesaid plastic material is a tetrafluoroethylene. 5. Membrane selon l'une quelconque des revendications 2 à 4, caractérisée en ce que les bourrelets (2a, 2b) susdits sont sensiblement semi-toriques de rayon extérieur égal à 2,5 millimètres.5. Membrane according to any one of claims 2 to 4, characterized in that the above-mentioned beads (2a, 2b) are substantially semi-toric with an outside radius equal to 2.5 millimeters. 6. Pompe à commande hydraulique à simple ou double membrane adaptée pour recevoir au moins une membrane selon l'une quelconque des revendications 2 à 5, et dont le corps comporte au moins deux éléments (12a, 12b) entre lesquels la membrane (10) est serrée, caractérisée en ce que chacun desdits éléments est pourvu d'une gorge torique (13) pour recevoir les bourrelets susdits et en ce que le rapprochement des éléments en fin de serrage est limité à 80 % environ de l'épaisseur totale E de la membrane au niveau de ses bourrelets, le serrage n'étant effectué que sur les bourrelets.6. Single or double diaphragm hydraulic control pump adapted to receive at least one diaphragm according to any one of claims 2 to 5, and the body of which comprises at least two elements (12a, 12b) between which the diaphragm (10) is clamped, characterized in that each of said elements is provided with an O-ring groove (13) to receive the aforementioned beads and in that the bringing together of the elements at the end of clamping is limited to approximately 80% of the total thickness E of the membrane at the level of its beads, the tightening being carried out only on the beads.
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
FR8110917 1981-06-02
FR8110917A FR2506859B1 (en) 1981-06-02 1981-06-02 MEMBRANE FOR HYDRAULICALLY CONTROLLED PUMP AND APPLICABLE PUMP

Publications (3)

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

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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)

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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

Citations (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
FR1547601A (en) * 1966-10-20 1968-11-29 Diaphragm pump, especially for vacuum generation in aggressive media
US3771907A (en) * 1971-09-13 1973-11-13 Reynolds Products Simplified positive displacement syrup pump assembly for drink machines

Patent Citations (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
FR1547601A (en) * 1966-10-20 1968-11-29 Diaphragm pump, especially for vacuum generation in 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
ATE10964T1 (en) 1985-01-15
FR2506859A1 (en) 1982-12-03
EP0066522B2 (en) 1990-01-31
EP0066522B1 (en) 1984-12-27
FR2506859B1 (en) 1986-04-11
DE3261687D1 (en) 1985-02-07

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