EP0441681B1 - Verbesserung einer Anzeigevorrichtung für den Membranbruch bei einer Doppelmembranpumpe - Google Patents

Verbesserung einer Anzeigevorrichtung für den Membranbruch bei einer Doppelmembranpumpe Download PDF

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Publication number
EP0441681B1
EP0441681B1 EP91400218A EP91400218A EP0441681B1 EP 0441681 B1 EP0441681 B1 EP 0441681B1 EP 91400218 A EP91400218 A EP 91400218A EP 91400218 A EP91400218 A EP 91400218A EP 0441681 B1 EP0441681 B1 EP 0441681B1
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EP
European Patent Office
Prior art keywords
duct
detector
capillary
diaphragms
diaphragm
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.)
Expired - Lifetime
Application number
EP91400218A
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English (en)
French (fr)
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EP0441681A1 (de
Inventor
Rémy Lefebvre
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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Publication date
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Priority to AT91400218T priority Critical patent/ATE97198T1/de
Publication of EP0441681A1 publication Critical patent/EP0441681A1/de
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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 invention relates to an improvement to diaphragm rupture detection devices in hydraulically controlled double diaphragm pumps.
  • Hydraulically operated or actuated pumps have one or more membranes which, because they are under pressure, work in better conditions than mechanically actuated pumps. At least two membranes are used to be able to easily detect the rupture of a membrane, by monitoring the pressure in the space existing between the two membranes. This space is delimited by the membranes themselves and by an annular structural part, inserted between the membranes at their periphery, on which they are pinched by the two parts of the pump body. This annular part comprises a conduit which opens to the outside. A device for detecting either the presence of a liquid or the existence of an abnormally high pressure is installed at the outlet of this conduit, the annular part serving as a support for this device.
  • a non-return valve is installed on this conduit to prevent the return of the content of the pipe between the two membranes, which would adversely affect the performance of the pump, during the suction stroke, especially if this content is partly gaseous.
  • Such pumps are illustrated in particular by documents FR-A-2,553,636 and FR-A-2,624,922.
  • This membrane rupture detection device has a drawback when the pumped product is liable to diffuse through the flexible membranes. Indeed, it is generally in the gaseous phase that this product diffuses and, little by little, with each delivery stroke, the monitoring pipe is filled with gas, trapped by the non-return valve. The pressure can reach a value disabling the non-return valve. The space between the membranes can no longer be purged of this gas, and there is a significant loss of the accuracy of the nominal flow rate given the compressibility of this gas which expands and compresses with each pumping cycle. In addition, the pressure reaches the triggering point of the membrane rupture detection device and this is information error which is thus delivered by the latter, reducing the credit given to its reliability and resulting in unnecessary interventions.
  • the invention intends to remedy this drawback by proposing a simple improvement to known devices for detecting membrane rupture such as those described in documents FR-A-2,533,636 and FR-A-2,624,922.
  • the subject of the invention is an improvement to a device for detecting the rupture of a membrane of a hydraulically actuated pump comprising two membranes pinched in a sealed manner at their periphery on a fixed structure comprising an annular part interposed between the two membranes. , the internal space between the two membranes being in communication with at least one pipe connected to an external detector through the intermediate annular piece, which consists in that the pipe comprises a bypass for putting its volume in communication with the atmosphere through a capillary duct.
  • the bypass is connected beyond the capillary duct to a leak collecting duct.
  • the pipe leading to the detector is produced in an element attached to the annular structural part, this element being provided, between the pipe and its external surface of an internal section of the branch to which the capillary duct, in the form of a tube external to the part, is detachably connected.
  • the element has another internal duct, the ends of which, opening onto its outer surface, include, for one, means of connection of the other end of the capillary tube, and for the other, means of connection of the collecting duct.
  • a double diaphragm pump comprises a pumping chamber 1, delimited by one of the membranes 2, and a pumping head 3 provided with a suction duct (not shown) and a delivery 4.
  • the volume of the pumping chamber varies because the diaphragm 2 is deformable and is subjected to the action of a hydraulic fluid contained in an actuating chamber 5, located at the rear of the diaphragm. 2 and delimited by the pump body 6 and a second deformable membrane 7, attached to the membrane 2.
  • the pumping head and the pump body are clamped on a structural part, annular 8, by pinching the periphery of the two membranes.
  • the device for detecting the rupture of a membrane comprises a pipe 10 arranged radially in the part 8, and leading to a detector 11, which can be a pressure gauge or any other sensor or device triggering an alert signal when the prevailing pressure in line 10 is greater than a given threshold.
  • a detector 11 which can be a pressure gauge or any other sensor or device triggering an alert signal when the prevailing pressure in line 10 is greater than a given threshold.
  • a non-return valve 12 prevents the product contained in the line 10 from returning towards the inter-membrane space when there is a vacuum in the working chambers and pumping, during aspiration.
  • This arrangement is necessary because the product in line 10 is generally gaseous and comes from the diffusion of a component of the product pumped through the membrane 2.
  • the gas present between the membranes expands and compresses with each pumping cycle at detriment to the flow conveyed by the pump.
  • bypass duct 13 establishing a leak line 10 to the atmosphere.
  • This bypass 13 comprises a capillary conduit 14 which calibrates the leak so that in normal operation of the pump, the leak is substantially equal to the flow of gas which enters the pipe 10 due to its diffusion through the membrane 2. This leakage therefore makes it possible to avoid that, in the long run, the pressure in the pipe 10 is too high and leads to the fact that, the valve 12 no longer being able to play its role, the gas accumulates between the membranes and causes performance to drop of the pump.
  • the pipe 10 would be filled with working liquid or pumped product, the viscosity of which is much higher than that of the diffusing gas, in an abruptly very large quantity.
  • This product or liquid would undergo, at the level of the capillary 14 a loss of head which is sufficiently large that, during the delivery stroke, the pressure in the line 10 reaches the detection threshold. Leakage of liquid or product to the outside is very low.
  • the branch 13 comprises a first section 13a, formed inside an element 15 for supporting the detector 11, which contains the pipe 10, and which ends outside this element 15.
  • the capillary conduit 14 which is in the form of a tube outside the element 15, is connected therein in a removable manner, to give the possibility of adjusting the leakage by changing the capillary tube , for example depending on the nature of the pumped fluid, or the power of the pump, if it is admitted that the element 15 can be identical for several pumps.
  • the other end of the capillary tube is connected to a second section 13b of the branch 13, formed in the element 15, the other outlet of which on the surface of this element 15 is equipped with means for the connection of a conduit 16 collecting the leak, or of the pumped product in the event of rupture of the membrane 2.
  • This arrangement is particularly important for pumps intended for handling toxic products, because it avoids their rejection into the atmosphere.
  • the presence of this element 15 allows easy adjustment of the improvement provided by the invention, by interchangeability of the capillary tubes 14.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (4)

  1. Vorrichtung zum Erfassen eines Membranbruches bei einer hydraulisch angetriebenen Pumpe mit zwei Membranen (2, 7), die an ihrem Umfang an einer feststehenden Struktur dicht eingespannt sind, wobei die Struktur ein Ringteil (8) umfaßt, das zwischen die beiden Membranen (2, 7) eingefügt ist und wobei der Zwischenraum zwischen beiden Membranen mit mindestens einer Leitung (10) in Verbindung steht, die durch das dazwischen liegende Ringteil hindurch an einen äußeren Detektor (11) angeschlossen ist, dadurch gekennzeichnet, daß die Leitung (10) eine Abzweigung (13) umfaßt, welche ihr Innenvolumen über eine Kapillarleitung (14) mit der Atmosphäre verbindet.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeich net, daß die Abzweigung (13) jenseits der Kapillarleitung an eine Leckagesammelleitung (16) angeschlossen ist.
  3. Vorrichtung nach Anspruch 1 oder 2, dadurch ge kennzeichnet, daß die zu dem Detektor führende Leitung in einem Element (15) ausgebildet ist, das sich an das Zwischenteil (8) der Struktur anschließt, wobei das Element zwischen der Leitung (10) und seiner Außenoberfläche mit einem Innenabschnitt (13a) der Abzweigung (13) Versehen ist, mit welcher die Kapillarleitung (14) in Form einer außerhalb des Elementes liegenden Rohrleitung lösbar verbunden ist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeich net, daß das Element (15) eine weitere interne Leitung (13b) besitzt, deren beide Enden an seiner Außenoberfläche münden und einerseits Anschlußmittel für das andere Ende des Kapillarrohres (14) und andererseits Anschlußmittel für die Sammelleitung (16) umfassen.
EP91400218A 1990-02-08 1991-01-30 Verbesserung einer Anzeigevorrichtung für den Membranbruch bei einer Doppelmembranpumpe Expired - Lifetime EP0441681B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91400218T ATE97198T1 (de) 1990-02-08 1991-01-30 Verbesserung einer anzeigevorrichtung fuer den membranbruch bei einer doppelmembranpumpe.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR909001458A FR2657923B1 (fr) 1990-02-08 1990-02-08 Perfectionnement a un dispositif detecteur de rupture de membrane dans une pompe a membrane double.
FR9001458 1990-02-08

Publications (2)

Publication Number Publication Date
EP0441681A1 EP0441681A1 (de) 1991-08-14
EP0441681B1 true EP0441681B1 (de) 1993-11-10

Family

ID=9393496

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400218A Expired - Lifetime EP0441681B1 (de) 1990-02-08 1991-01-30 Verbesserung einer Anzeigevorrichtung für den Membranbruch bei einer Doppelmembranpumpe

Country Status (7)

Country Link
EP (1) EP0441681B1 (de)
JP (1) JPH04228890A (de)
AT (1) ATE97198T1 (de)
CA (1) CA2035842C (de)
DE (1) DE69100597T2 (de)
ES (1) ES2063457T3 (de)
FR (1) FR2657923B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690232A1 (de) * 1994-06-28 1996-01-03 MTA Automation AG Membranpumpe
DE10233561B4 (de) * 2002-07-24 2008-02-21 Prominent Dosiertechnik Gmbh Sicherheitsmembran für eine Membranpumpe
CN109611324B (zh) * 2019-01-29 2023-06-02 重庆水泵厂有限责任公司 隔膜泵隔膜报警密封结构
CN112610462A (zh) * 2020-12-16 2021-04-06 嘉善边锋机械股份有限公司 一种适用于易燃易爆物料的隔膜泵膜片破裂预警装置
CN113790148B (zh) * 2021-10-19 2025-05-02 豪顿华工程有限公司 一种隔膜压缩机双阀微泄放装置
JP7427838B1 (ja) * 2023-07-28 2024-02-05 日機装株式会社 ダイアフラム破損検出装置および往復動ポンプ装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2164024A1 (de) * 1971-12-10 1973-07-27 Malizard Max
DE2406838A1 (de) * 1974-02-13 1975-08-21 Siemens Ag Gasbetriebene doppelmembranpumpe zur foerderung von wasserstoffperoxid
FR2533636B1 (fr) * 1982-09-28 1987-03-20 Milton Roy Dosapro Dispositif de detection de rupture de membrane
FR2564942B1 (fr) * 1984-05-25 1987-07-10 Clextral Purgeur automatique pour pompe a double membrane a commande hydraulique.
FR2624922B1 (fr) * 1987-12-17 1990-04-27 Milton Roy Dosapro Dispositif de detection de rupture d'une membrane de pompe a membrane

Also Published As

Publication number Publication date
FR2657923A1 (fr) 1991-08-09
ES2063457T3 (es) 1995-01-01
CA2035842C (fr) 1995-05-09
JPH04228890A (ja) 1992-08-18
DE69100597T2 (de) 1994-06-01
ATE97198T1 (de) 1993-11-15
EP0441681A1 (de) 1991-08-14
DE69100597D1 (de) 1993-12-16
FR2657923B1 (fr) 1994-06-10

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