EP1479910A2 - Membrane de capteur - Google Patents

Membrane de capteur Download PDF

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Publication number
EP1479910A2
EP1479910A2 EP04101686A EP04101686A EP1479910A2 EP 1479910 A2 EP1479910 A2 EP 1479910A2 EP 04101686 A EP04101686 A EP 04101686A EP 04101686 A EP04101686 A EP 04101686A EP 1479910 A2 EP1479910 A2 EP 1479910A2
Authority
EP
European Patent Office
Prior art keywords
membrane
sensor
layer
conductive
membrane layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04101686A
Other languages
German (de)
English (en)
Other versions
EP1479910B1 (fr
EP1479910A3 (fr
Inventor
Rainer Weisbrodt
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.)
Prominent Dosiertechnik GmbH
Original Assignee
Prominent Dosiertechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prominent Dosiertechnik GmbH filed Critical Prominent Dosiertechnik GmbH
Priority to SI200430443T priority Critical patent/SI1479910T1/sl
Priority to PL04101686T priority patent/PL1479910T3/pl
Publication of EP1479910A2 publication Critical patent/EP1479910A2/fr
Publication of EP1479910A3 publication Critical patent/EP1479910A3/fr
Application granted granted Critical
Publication of EP1479910B1 publication Critical patent/EP1479910B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F04B43/0054—Special features particularities of the flexible members
    • 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
    • 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 present invention relates to a sensor membrane having a plurality of sandwiches arranged membrane layers, which allows a rupture of the delivery membrane during operation or to determine at a standstill.
  • diaphragm pumps are known in which a flexible membrane, the terminates a pump volume, is rapidly reciprocated to produce a fluid, i. a liquid or a gas to suck through an intake valve and in the next cycle through an exhaust valve eject.
  • a fluid i. a liquid or a gas
  • Such diaphragm pumps are often used for dosing chemicals in process engineering Processes used.
  • the membranes must be inert to aggressive ones Chemicals, e.g. Acids, be. Therefore, the delivery membrane is mostly from the brand Teflon available plastic PTFE (polytetrafluoroethylene) produced.
  • PTFE polytetrafluoroethylene
  • sensor membranes For early detection of breaks in the delivery membrane so-called sensor membranes known that generate an electrical warning signal when tearing the conveyor diaphragm.
  • the document EP 0 715 690 B1 shows a delivery membrane, in which in the PTFE layer a wire loop is poured, covering the largest possible area of the membrane. Tears or breaks the membrane, so the wire of the loop also breaks and the electrical contact is interrupted. The interruption of the contact is detected by a corresponding evaluation electronics and an alarm signal is triggered.
  • a disadvantage here proves that the wires due to which, that they must be designed very thin, already by the mechanical stress during Cycle the membrane can break, although still no cracks in the PTFE material of the delivery membrane appeared.
  • EP 0 732 501 B1 discloses a sensor membrane comprising two conductive layers within the membrane, which is isolated by another non-conductive layer against each other are. All three layers are made of rubber, that for the conductive layers with carbon is mixed. Now breaks the arranged on the rubber layers conveyor membrane, it comes to pumping liquid or the gas in contact with the first conductive layer. Break these too first conductive layer and also the underlying insulating rubber layer, so closes the liquid the two conductive layers are short and a warning signal is output.
  • a great disadvantage in this embodiment of a sensor membrane that breaks in the delivery membrane only detected be, although the lying below the conveyor membrane conductive and insulating membrane layers made of rubber. A diaphragm fracture thus becomes a very advanced one Time of damage indicated. Especially with very aggressive liquids At this time, liquid may already have entered the drive unit of the pump.
  • the present invention has the object, a To provide sensor membrane, which solves the aforementioned problems.
  • the sensor membrane according to the invention in that they have several sandwiched membrane layers having a delivery membrane, a first electrically conductive membrane layer disposed thereunder, an electrically arranged underneath insulating membrane layer and a second electrically conductive membrane layer arranged underneath comprising, wherein the first and second conductive membrane layers by the electrically insulating membrane layer are separated from each other and electrically insulated and the second electrically conductive membrane layer has portions passing through openings in the electrically insulating Membrane layer and pass through openings in the first electrically conductive membrane layer and the electrically insulating membrane layer has portions passing through openings in the first reach through the conductive membrane layer.
  • the inventive solution of the problem is particularly advantageous because a break in the Delivery membrane is detected as soon as liquid has passed through the delivery membrane and up to the level the first conductive membrane layer has penetrated. Up to this level, i. above the first conductive membrane layer, also extends through the openings cross-cutting material of the second Membrane layer. In the normal state, i. intact condition, the materials are the first and second conductive membrane layers, however, by the material of the insulating membrane layer, the also passes through the openings in the first conductive membrane layer, electrically from each other isolated.
  • PTFE polytetrafluoroethylene
  • the electrically conductive and electrically insulating membrane layers Rubber, preferably a plastic-fiber-reinforced EPDM (ethylene-propylene terpolymer) are made.
  • EPDM ethylene-propylene terpolymer
  • Such a rubber has the advantage that it is highly flexible, pressure resistant and very is claimable. This is especially true for those occurring in membranes in diaphragm pumps Walk movements. If the rubber is mixed with an appropriate amount of carbon particles, so it becomes conductive, with the positive properties of the rubber full or at least in be preserved to a sufficient extent.
  • the membrane is substantially circular disk-shaped is. Due to the symmetry then the stresses occur by the walking movements evenly distributed over the circumference of the membrane. It is advantageous if the Membrane layers have substantially the same diameter. This prevents, for example when tearing the delivery membrane to the underlying membrane layers liquid passes into the area of the pump drive.
  • the passages through the first electrically conductive membrane layer have a circular, oval or square shape, wherein circular penetration for stability reasons are particularly preferred.
  • at least some of the passages are kidney-shaped about the midpoint the membrane arranged openings.
  • the membrane many possible contact bridges that capture a fraction of the delivery membrane can, arrange. Due to the circular disk shape of the membrane, it is advantageous if the passages are arranged symmetrically around the center of the membrane around. In addition it can be advantageous if a penetration in the center of the membrane is arranged. That's how everyone is monitor areas of the conveyor diaphragm that are particularly prone to galling for cracks and fractures.
  • an embodiment of the invention in which preferably between 4 and 20 Passages symmetrically arranged in concentric circles around the center of the membrane are. This allows a goodêtnabdekkung for the typical diameter of the delivery membranes by the possible contact bridges between the first and the second conductive membrane layer. Thus, the particularly strongly gewalkten areas of the membrane near the clamping area especially good and monitor the length of the entire circumference.
  • the passages in the form of concentric circles around the center of the Membrane be arranged around. This allows monitoring of the tightness of the delivery membrane along the length of the entire circumference in the area of maximum stress.
  • the delivery membrane has one or more having concentrically arranged around the center of the membrane sealing beads. These are arranged in the region of the clamping region of the membrane, so that they here an effective seal form between the delivery membrane and the pump volume limiting housing. Since the delivery membrane does not need to be further sealed, it can easily, without additional To use sealant to be replaced.
  • the membrane has a membrane core made of plastic or metal or combinations thereof, which is below the second conductive Membrane layer is arranged symmetrically to the center of the membrane. This forms the mechanical connection between the individual membrane layers and the membrane driving Mechanics.
  • a further insulating membrane layer is arranged below the second conductive membrane layer, i. between this and the membrane core. This provides electrical insulation between the second conductive membrane layer and the membrane core ago. It can also be positively connected to the membrane core, so that they transmits the movement of the core directly to the membrane.
  • an embodiment of the invention in which the two electrically conductive Membrane layers with the two connections of a resistance, current or voltage measuring device are connected.
  • a bridging of the insulation between the two can be electrically conductive membrane layers by the liquid to be pumped easily by a change detect the resistance and optionally output an alarm signal.
  • the conductive membrane layers are preferably made of rubber, as stated above, which are admixed with carbon particles for the conductivity.
  • the conductivity of these mixtures is but not comparable to that of metallic conductors, but by several orders of magnitude lower.
  • the resistors to be measured at contact closure between the first and second conductive membrane layer are therefore usually in the megaohm range. It is appropriate when the conductive membrane layers by means of metallic contact pins of the pumped Liquid can be contacted from opposite side.
  • the pin contacting the first conductive membrane layer by the second electrically conductive membrane layer and the electrically insulating membrane layer engages being in the area the second electrically conductive membrane layer by material of the insulating membrane layer opposite the second electrically conductive membrane layer or other insulating material is isolated.
  • Such a design makes it possible to easily replace the membrane, since can apply a simple plug-in connection to the contact pins, the membrane with the corresponding Measuring electronics connects.
  • FIG. 1 clearly shows the schematic structure of a preferred embodiment of the invention Sensor membrane.
  • the delivery membrane 1 forms the uppermost layer of the sensor membrane. It consists in the embodiment shown of PTFE.
  • two sealing beads 8 can be seen, which protrude from the conveying membrane 1.
  • the two sealing beads 8 are in the so-called clamping region 9 of the membrane. This area will clamped in the designated clamp mount the diaphragm pump under pressure. there seal the sealing beads 8, the membrane against its holder, so that no liquid from the Working space can escape.
  • the first conductive membrane layer 2 arranged below the delivery membrane 1, which is made of rubber, which enriched with synthetic fibers to increase the stability and additionally contains carbon particles in an amount such that the rubber membrane is conductive is.
  • the first conductive membrane layer 2 forms a continuous body, as a Part is made. This can be seen particularly clearly in the exploded view in FIG.
  • the first conductive membrane layer 2 has openings 6. Below the first conductive membrane layer 2 is the insulating membrane layer 3, also made of rubber with plastic fibers, arranged. This has regions 12 which extend over the plane formed by the membrane layer 3 extend upward and reach through the openings 6 of the first conductive membrane layer 2.
  • the second electrically conductive membrane layer 4 is arranged below the insulating membrane layer 3. This has areas 7, which protrude from the plane formed by the membrane layer 4 and through the openings 5 in the insulating membrane layer 3 in the openings 6 of the first conductive Engage membrane layer 2. They are from the also in the openings 6 of the first conductive membrane layer 2 engaging portions 12 of the insulating membrane layer 3 surrounded and thus electrically isolated from the first conductive membrane layer 2.
  • Figure 3 shows an alternative embodiment to the membrane of Figures 1 and 2 with a somewhat other number and arrangement of the through openings. Otherwise, the structure is the same, which is why like parts are designated by like reference numerals.
  • the individual layers of the membrane are connected to each other by vulcanization or gluing, so that they form a unit mechanically.
  • a membrane core 10 is arranged made of metal or plastic. This consists essentially of a cylindrical rod which has a receptacle 15 at the lower end has, in which engages the connecting rod of the drive unit.
  • the membrane core 10 transmits the Translational movement of the drive unit to the located above the diaphragm core 10 layers the sensor membrane.
  • the lowest insulating membrane layer 11 designed so that they form fit in the head 16 of the Diaphragm core 10 intervenes.
  • the translational movement of the diaphragm core 10 becomes both in the lifting as well as in the suction direction on the membrane layers (1, 2, 3, 4, 11). This can also be seen particularly clearly in FIG.
  • the electrical contacting of the electrically conductive membrane layers 2, 4 takes place by means of metal pins 13 and 14, which pass through the lowest insulating membrane layer 11 to the corresponding electrically conductive membrane layers into it. It is important to note that the pin 13, the first electrically conductive membrane layer 2 contacted by means of the material of the insulating Membrane layer 3 or with another material compared to the second electrically conductive Membrane layer 4 is isolated.
  • the pins 13 and 14 with the two terminals a resistance meter connected.
  • the electrical resistance between the two electrical conductive membranes 2, 4 is measured. If the delivery membrane 1 is intact, i. reject them no continuous cracks or breaks, so the surface of the under the conveyor membrane 1 membrane layers are not wetted by the liquid and the resistance between the first and second electrically conductive layer (2, 4) is extremely large. In case of damage, i. when in the Conveying membrane 1 through cracks or breaks occur, penetrates the liquid to be pumped through the conveying membrane 1 and wets the surface of the under the conveying membrane. 1 lying diaphragm layers, so that the electrical resistance between the first 2 and second electrically conductive membrane layer becomes smaller, e.g. in the range of 50 M ⁇ and less. Such a decrease of the electrical resistance can be detected by the resistance measuring device and triggers an alarm when it falls below a previously set threshold.
  • the sensor membrane can be immediately after the occurrence of the leak alarm or after a predetermined Time interval are exchanged.
  • the replacement of the membrane is due to the design
  • Their mechanical and electrical connections are very simple and can be learned Assistants executable.
  • the edge areas of the membrane are in a designated Holder clamped and are due to the provided sealing beads 8 after clamping automatically sealed.
  • the electrical connection to the Pins 13 and 14 is done by means of a standardized plug element.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Measuring Fluid Pressure (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Diaphragms And Bellows (AREA)
  • Laminated Bodies (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
EP04101686A 2003-05-20 2004-04-22 Membrane de capteur Expired - Lifetime EP1479910B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200430443T SI1479910T1 (sl) 2003-05-20 2004-04-22 Senzorska membrana
PL04101686T PL1479910T3 (pl) 2003-05-20 2004-04-22 Membrana czujnikowa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10323059A DE10323059A1 (de) 2003-05-20 2003-05-20 Sensormembran
DE10323059 2003-05-20

Publications (3)

Publication Number Publication Date
EP1479910A2 true EP1479910A2 (fr) 2004-11-24
EP1479910A3 EP1479910A3 (fr) 2005-09-21
EP1479910B1 EP1479910B1 (fr) 2007-09-05

Family

ID=33039255

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04101686A Expired - Lifetime EP1479910B1 (fr) 2003-05-20 2004-04-22 Membrane de capteur

Country Status (9)

Country Link
US (1) US6935180B2 (fr)
EP (1) EP1479910B1 (fr)
JP (1) JP4666340B2 (fr)
AT (1) ATE372461T1 (fr)
DE (2) DE10323059A1 (fr)
DK (1) DK1479910T3 (fr)
ES (1) ES2290626T3 (fr)
PL (1) PL1479910T3 (fr)
SI (1) SI1479910T1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106841327A (zh) * 2017-04-06 2017-06-13 重庆华伟沃电科技有限公司 一种带破损检测传感器的窨井盖
WO2017125349A1 (fr) * 2016-01-21 2017-07-27 Tetra Laval Holdings & Finance S.A. Pompe à membrane à détection de fuite
WO2017140418A1 (fr) * 2016-02-17 2017-08-24 Timmer Gmbh Pompe à membrane, membrane pour une pompe à membrane et procédé de détection d'une membrane défectueuse d'une pompe à membrane
CH712963A1 (de) * 2016-09-29 2018-03-29 Daetwyler Schweiz Ag Pumpenmembran für eine Membranpumpe zur Förderung eines Fluides.

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6941853B2 (en) * 2003-12-02 2005-09-13 Wanner Engineering, Inc. Pump diaphragm rupture detection
GB2433298A (en) * 2005-12-13 2007-06-20 Joseph Anthony Griffiths Diaphragm with rupture detection
US20080003120A1 (en) * 2006-06-30 2008-01-03 Meza Humberto V Pump apparatus and method
DE102009023012A1 (de) * 2009-05-28 2010-12-16 G.S. Anderson Gmbh Membranventil-Membran
GB201015586D0 (en) 2010-09-17 2010-10-27 Qinetiq Ltd Leakage censor
JP6271871B2 (ja) * 2013-06-04 2018-01-31 株式会社フジキン ダイヤフラム弁
DE102013214304A1 (de) 2013-07-22 2015-01-22 Gemü Gebr. Müller Apparatebau Gmbh & Co. Kommanditgesellschaft Membran und Verfahren zu deren Herstellung
US10330094B2 (en) 2013-08-26 2019-06-25 Blue-White Industries, Ltd. Sealing diaphragm and methods of manufacturing said diaphragm
EP3415759B1 (fr) 2017-06-13 2020-12-02 SISTO Armaturen S.A. Membrane dotée des structures conductrices
EP3604876B2 (fr) 2018-08-03 2024-04-03 SISTO Armaturen S.A. Diagnostic de membrane à l'aide de l'interface aérienne
DE102019109283A1 (de) * 2019-04-09 2020-10-15 Prominent Gmbh Membranbruchüberwachung
TWI864482B (zh) * 2022-11-10 2024-12-01 茂特隆股份有限公司 壓力感測膜片
DE102023132946A1 (de) * 2023-11-27 2025-05-28 Prominent Gmbh Membranbruchmeldeeinrichtung
DE102024210443A1 (de) * 2024-10-30 2026-04-30 Robert Bosch Gesellschaft mit beschränkter Haftung Membran für Membranpumpe

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US4177680A (en) * 1977-10-14 1979-12-11 Bunker Ramo Corporation Dual pressure sensor
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017125349A1 (fr) * 2016-01-21 2017-07-27 Tetra Laval Holdings & Finance S.A. Pompe à membrane à détection de fuite
WO2017140418A1 (fr) * 2016-02-17 2017-08-24 Timmer Gmbh Pompe à membrane, membrane pour une pompe à membrane et procédé de détection d'une membrane défectueuse d'une pompe à membrane
CH712963A1 (de) * 2016-09-29 2018-03-29 Daetwyler Schweiz Ag Pumpenmembran für eine Membranpumpe zur Förderung eines Fluides.
WO2018060034A1 (fr) * 2016-09-29 2018-04-05 Dätwyler Schweiz Ag Pompe à membrane
US10900478B2 (en) 2016-09-29 2021-01-26 Dätwyler Schweiz Ag Pump membrane for diaphragm pump
CN106841327A (zh) * 2017-04-06 2017-06-13 重庆华伟沃电科技有限公司 一种带破损检测传感器的窨井盖

Also Published As

Publication number Publication date
JP4666340B2 (ja) 2011-04-06
PL1479910T3 (pl) 2008-01-31
ATE372461T1 (de) 2007-09-15
EP1479910B1 (fr) 2007-09-05
EP1479910A3 (fr) 2005-09-21
JP2004347115A (ja) 2004-12-09
US20040261536A1 (en) 2004-12-30
DK1479910T3 (da) 2008-04-21
DE10323059A1 (de) 2004-12-09
DE502004004843D1 (de) 2007-10-18
US6935180B2 (en) 2005-08-30
ES2290626T3 (es) 2008-02-16
SI1479910T1 (sl) 2007-12-31

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