WO1992019866A1 - Multi-layered diaphragm with leakage offtake for diaphragm pumps - Google Patents
Multi-layered diaphragm with leakage offtake for diaphragm pumps Download PDFInfo
- Publication number
- WO1992019866A1 WO1992019866A1 PCT/DE1992/000351 DE9200351W WO9219866A1 WO 1992019866 A1 WO1992019866 A1 WO 1992019866A1 DE 9200351 W DE9200351 W DE 9200351W WO 9219866 A1 WO9219866 A1 WO 9219866A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- membrane according
- leakage
- knitted fabric
- layer membrane
- Prior art date
Links
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
- F04B43/0081—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 a multi-layer diaphragm with leakage derivation for diaphragm pumps, in particular hydraulically actuated pumps, consisting of at least two individual diaphragms lying one above the other and fixed at a circumferential clamping point, between each of which there is an intermediate space.
- Multi-layer diaphragms of this type have the advantage that a diaphragm rupture can be indicated before the working and pumped medium come into contact with each other.
- the middle membrane is perforated and provided with radially outwardly conductive slots.
- One or more of the slots are connected to the environment. If one of the two outer membranes in contact with the conveying or hydraulic medium breaks, the medium passing through the breaking point is directed outward along the radial slots of the middle membrane and can be fed there to a suitable monitoring and signaling device.
- the superimposed membranes have to act as a single membrane in their entirety. by Glue to be connected.
- this adhesive connection is subject to considerable shear forces during operation, particularly at higher pressures, loads the diaphragms very unfavorably during the suction stroke and therefore noticeably affects the operational safety of the pump. Increased rigidity must also be accepted.
- DE-PS 31 46 222 are porous, in the radial and axial direction permeable intermediate layers, e.g. in the form of fleece, between the individual membranes.
- permeable intermediate layers e.g. in the form of fleece
- such relatively soft, porous intermediate layers lose their porosity with increasing surface pressure, i.e. in the higher pressure range.
- the invention has for its object to form a multi-layer membrane of the type mentioned in such a way that the discharge of the leak from the space between the multi-layer membrane is created with the simplest of means, without sacrificing operational reliability.
- the space between the multilayer membrane should also be permeable to higher-viscosity media in both the low-pressure and high-pressure range so that in the event of a membrane breakage, conveying or penetrating between the membrane systems. Hydraulic medium can leak around the periphery of the membrane for the purpose of leakage monitoring or reporting.
- a multilayer membrane of the type mentioned at the outset in that at least one space with at least one wrinkle-free and force-free layer following the deformation of the individual membranes and also liquid-permeable layer made of a scrim, knitted fabric, knitted fabric or fabric made of hard filaments is provided and that the intermediate space provided with this layer or these layers communicates in the area of the clamping point with a leakage discharge line accommodated in a surrounding housing.
- the material used here e.g. made of metal or ceramic or plastic
- the multilayer membrane can be designed in such a way that it concerns multiaxial or multidirectional scrims, knitted fabrics, knitted fabrics or fabrics. With such a material it is possible to work without wrinkles and forces even with a relatively large layer thickness.
- the multilayer membrane can be designed in such a way that at least one layer is in the form of a knitted fabric. This results in a particularly advantageous adaptation of the layer to the curvature of the individual membranes at low cost.
- the multilayer membrane can be designed in such a way that at least one layer is designed as a polyamide knitted fabric. The hardness of the polyamide can be chosen so that the layer remains liquid-permeable even at high pressures.
- the layer is a very inexpensive component.
- the multilayer membrane can be designed such that at least one layer is formed by a fiber reinforcement consisting of a scrim, knitted fabric, knitted fabric or fabric made of hard filaments, which is arranged on one of the mutually facing surfaces of two superimposed individual membranes and from this surface protrudes.
- the fabric reinforcement is usually placed inside the membrane.
- this proposal according to the invention uses a plastic fabric, for example made of polyester or polyamide, with a texture that is as coarse as possible, so that the fibers of the fabric are still partially outside the rubber-like membrane. Base material.
- the protruding texture facilitates the drainage of accumulated leakage between the membrane systems in the event of a membrane breakage.
- the texture of the protruding tissue can be sufficient for the leakage fluid to drain, particularly in the case of low-viscosity conveying and hydraulic fluids and when the pressures are not extremely high.
- the multilayer membrane can be designed such that at least one layer (9) as a separate intermediate layer between two on top of one another! single membranes is formed.
- Layer thickness and material can be used here be well adapted to the respective requirements.
- the combination of such a layer forming a separate intermediate layer with a layer formed by a reinforcing insert can be expedient.
- the multilayer membrane can be designed in such a way that a liquid which is inert to the conveying and hydraulic medium is located in the intermediate spaces and, in the event of a membrane breakage, hydraulically transmits a leakage message to the outside.
- a liquid which is inert to the conveying and hydraulic medium is located in the intermediate spaces and, in the event of a membrane breakage, hydraulically transmits a leakage message to the outside.
- Such an inert liquid which is in communication with the environment outside the pump housing, enables a quick response in the event of a diaphragm rupture, so that there is the possibility of a leakage message long before the multi-layer diaphragm becomes leaky as a whole.
- the multilayer membrane can be designed such that the individual membranes are spherical shaped membranes made of elastomers, which are mechanically connected to one another, for example via two membrane braces clamped by means of a screw connection.
- the pump stroke is carried out by stretching the diaphragm in one and in the opposite direction. Repeated stretching exposes both the membranes and the tissue reinforcement to constant internal tension so that they tend to tear in the area of greatest tension, ie in the middle of the membrane.
- the service life of such flat membranes is therefore short and they have to be changed accordingly often.
- Another disadvantage of flat membranes is that due to the high internal stresses, they are not made with chemically highly resistant plastics such as PTFE.
- the mechanical coupling of the individual membranes is a structurally particularly simple solution. In addition, it is also completely leak-tight if one membrane plate is vulcanized into the membrane layer facing the medium to be pumped and the other membrane plate clamps the two membrane systems together using a screw connection.
- the multi-layer membrane can be designed such that the individual membranes each have a ring-like bead on their outer edges, which is tightly clamped in a correspondingly formed circumferential groove in the housing.
- the clamping point of the multi-layer membrane serves on the one hand as centering and fixing the individual membranes; on the other hand, it must seal the fluid and the hydraulic medium space from the outside.
- the simplest method of clamping a membrane in a sealing manner is based on the principle of a round sealing ring, which has a semicircular to triangular-like cross section. For this purpose, a round ring-like bead is attached to the outer circumference of the individual membranes and the clamping point in the housing is designed as a correspondingly shaped groove.
- the multilayer membrane can be designed such that the circumferential groove or the circumferential grooves is or are connected to the environment outside the housing.
- a possible leakage can be visually detected by optical monitoring on the outside of the pump housing.
- the multilayer membrane can be designed such that the circumferential groove or grooves is or are connected to a leakage detection device.
- the leakage can be done automatically, for example by electr see evaluation of a liquid sensor can be detected.
- the multilayer membrane can be designed such that the leakage detection device is a pressure sensor or pressure switch.
- the leakage report can be made continuously using a pressure sensor or discontinuously using a pressure switch.
- the pressure sensor has the advantage that a creeping diaphragm rupture is noticeable through a slowly increasing pressure build-up.
- the pressure switch is probably the cheapest automatic signaling device, but can only be set to a fixed value, which then outputs the leakage message without warning.
- two exemplary embodiments of the multilayer membrane according to the invention are illustrated with the aid of a drawing.
- the drawing shows a section of a longitudinally cut diaphragm pump with a multi-layer diaphragm consisting of two individual diaphragms 1, 2, which is clamped between the housing parts 3, 4.
- the two single membranes 1, 2 are mechanically clamped over two membranes 5.6 and a screw connection.
- the individual membranes 1, 2 each have a round-ring-like bead 7, 8 with a triangular cross section on their outer edges.
- a layer which is permeable to liquid even under pressure here connects the intermediate space 10 between the individual membranes 1, 2 with a groove 11 located in the housing 3, 4.
- the layer 9 is designed as a knitted fabric and lies as a blank between the individual membranes 1, 2. It consists of textured polyamide filament yarn of type 6.6.
- the groove 11 communicates with the surroundings outside the housing 3, 4 via a bore 12.
- a bore 13 is provided for receiving a pressure sensor or pressure switch (not shown).
- layer 9 is of a fabric reinforcement is formed, which is embedded in a single membrane 1, 2 and protrudes from the surface of the single membrane 1, 2 facing the adjacent single membrane 1, 2. This results in an above-mentioned liquid-permeable texturing.
- Both mutually facing surfaces of two individual membranes 1, 2 delimiting an intermediate space 10 can be provided with such a texturing.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92909856A EP0582628B1 (en) | 1991-05-03 | 1992-05-04 | Multi-layered diaphragm with leakage offtake for diaphragm pumps |
JP04508953A JP3133067B2 (en) | 1991-05-03 | 1992-05-04 | Multilayer diaphragm with leak outlet for diaphragm pump |
DE59207956T DE59207956D1 (en) | 1991-05-03 | 1992-05-04 | MULTI-LAYER DIAPHRAGM WITH LEAKAGE DRAINAGE FOR DIAPHRAGM PUMPS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4114439 | 1991-05-03 | ||
DEP4114439.2 | 1991-05-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992019866A1 true WO1992019866A1 (en) | 1992-11-12 |
Family
ID=6430886
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1992/000351 WO1992019866A1 (en) | 1991-05-03 | 1992-05-04 | Multi-layered diaphragm with leakage offtake for diaphragm pumps |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0582628B1 (en) |
JP (1) | JP3133067B2 (en) |
AT (1) | ATE148202T1 (en) |
DE (1) | DE59207956D1 (en) |
WO (1) | WO1992019866A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1164292A1 (en) * | 1999-06-04 | 2001-12-19 | Firma Carl Freudenberg | Diaphragm leak detection device |
WO2004007960A1 (en) * | 2002-07-15 | 2004-01-22 | Schuetze Thomas | Multilayer membrane |
EP1384891A1 (en) * | 2002-07-24 | 2004-01-28 | ProMinent Dosiertechnik GmbH | Secure membrane for a membrane type pump |
CN103362793A (en) * | 2013-07-26 | 2013-10-23 | 胜瑞兰工业设备(苏州)有限公司 | Woven wire mesh membrane leakage guide device |
US8807014B2 (en) | 2011-04-27 | 2014-08-19 | Ckd Corporation | Multi-layer diaphragm |
US20150030466A1 (en) * | 2011-08-22 | 2015-01-29 | Cummins Emission Solutions, Inc. | Urea Solution Pumps Having Leakage Bypass |
WO2015054598A1 (en) * | 2013-10-11 | 2015-04-16 | Checkpoint Fluidic Systems International, Ltd. | Scalable pumping mechanism utilizing anti-synchronized poly-diaphragm stack |
WO2018036979A1 (en) * | 2016-08-25 | 2018-03-01 | Siemens Aktiengesellschaft | Double membrane for a dust pump |
US10914299B2 (en) | 2016-01-27 | 2021-02-09 | Dipl. Ing. Ernst Schmitz Gmbh & Co. Kg Maschinen Und Apparatebau | Diaphragm pump comprising dust suction from below |
US11215174B2 (en) | 2016-08-25 | 2022-01-04 | Dipl. Ing. Ernst Schmitz Gmbh & Co. Kg Maschinen Und Apparatebau | Diaphragm pump having a porous, arched aluminum filter |
US11590440B2 (en) | 2016-08-25 | 2023-02-28 | Dipl. Ing. Ernst Schmitz GmbH & Co. KG Maschinen and Apparatebau | Production of a porous aluminum filter for a diaphragm pump |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5776098A (en) * | 1995-08-03 | 1998-07-07 | Medela, Incorporated | Diaphragm pump and pump mounted in a carrying case useful in breast pumping |
DE19906317C1 (en) * | 1999-02-16 | 2000-10-19 | Knf Flodos Ag Sursee | Diaphragm pump |
JP4578981B2 (en) * | 2005-01-06 | 2010-11-10 | トヨタ自動車株式会社 | Cartridge tank and coating machine |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR990698A (en) * | 1944-03-29 | 1951-09-25 | Improvements to diaphragm pumps | |
FR2339076A1 (en) * | 1976-01-20 | 1977-08-19 | Warwick Pump & Eng Co | PUMPS FOR HIGH PRESSURES |
DE2620228A1 (en) * | 1976-05-07 | 1977-11-10 | Bran & Luebbe | Hydraulically actuated triple diaphragm pump - has middle diaphragm slots connected to liq. filled duct with resilient seal as rupture indicator |
DE3522711A1 (en) * | 1984-06-27 | 1986-01-02 | Clextral, Courbevoie | Diaphragm for hydraulically controlled or actuated pumps |
EP0250026A2 (en) * | 1986-06-11 | 1987-12-23 | NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. | Improved pumping device, particularly suitable for compressing fluids on deep sea-bottoms |
EP0267041A2 (en) * | 1986-11-07 | 1988-05-11 | The Gates Rubber Company | Diaphragm |
EP0321338A1 (en) * | 1987-12-17 | 1989-06-21 | DOSAPRO MILTON ROY, SociÀ©té dite: | Diaphragm failure detection device for a diaphragm pump |
WO1991002161A1 (en) * | 1989-08-11 | 1991-02-21 | Systems Chemistry, Inc. | Fluid pumping apparatus and system with leak detection and containment |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4934001A (en) * | 1972-07-31 | 1974-03-29 | ||
DE3931516C2 (en) * | 1989-09-21 | 1993-10-14 | Ott Kg Lewa | Diaphragm pump with a mechanically driven diaphragm |
-
1992
- 1992-05-04 JP JP04508953A patent/JP3133067B2/en not_active Expired - Fee Related
- 1992-05-04 AT AT92909856T patent/ATE148202T1/en not_active IP Right Cessation
- 1992-05-04 WO PCT/DE1992/000351 patent/WO1992019866A1/en active IP Right Grant
- 1992-05-04 DE DE59207956T patent/DE59207956D1/en not_active Expired - Lifetime
- 1992-05-04 EP EP92909856A patent/EP0582628B1/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR990698A (en) * | 1944-03-29 | 1951-09-25 | Improvements to diaphragm pumps | |
FR2339076A1 (en) * | 1976-01-20 | 1977-08-19 | Warwick Pump & Eng Co | PUMPS FOR HIGH PRESSURES |
DE2620228A1 (en) * | 1976-05-07 | 1977-11-10 | Bran & Luebbe | Hydraulically actuated triple diaphragm pump - has middle diaphragm slots connected to liq. filled duct with resilient seal as rupture indicator |
DE3522711A1 (en) * | 1984-06-27 | 1986-01-02 | Clextral, Courbevoie | Diaphragm for hydraulically controlled or actuated pumps |
EP0250026A2 (en) * | 1986-06-11 | 1987-12-23 | NUOVOPIGNONE INDUSTRIE MECCANICHE E FONDERIA S.p.A. | Improved pumping device, particularly suitable for compressing fluids on deep sea-bottoms |
EP0267041A2 (en) * | 1986-11-07 | 1988-05-11 | The Gates Rubber Company | Diaphragm |
EP0321338A1 (en) * | 1987-12-17 | 1989-06-21 | DOSAPRO MILTON ROY, SociÀ©té dite: | Diaphragm failure detection device for a diaphragm pump |
WO1991002161A1 (en) * | 1989-08-11 | 1991-02-21 | Systems Chemistry, Inc. | Fluid pumping apparatus and system with leak detection and containment |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1164292A1 (en) * | 1999-06-04 | 2001-12-19 | Firma Carl Freudenberg | Diaphragm leak detection device |
WO2004007960A1 (en) * | 2002-07-15 | 2004-01-22 | Schuetze Thomas | Multilayer membrane |
EP1384891A1 (en) * | 2002-07-24 | 2004-01-28 | ProMinent Dosiertechnik GmbH | Secure membrane for a membrane type pump |
US6907816B2 (en) | 2002-07-24 | 2005-06-21 | Prominent Dosiertechnik Gmbh | Safety diaphragm for a diaphragm pump |
US8807014B2 (en) | 2011-04-27 | 2014-08-19 | Ckd Corporation | Multi-layer diaphragm |
US20150030466A1 (en) * | 2011-08-22 | 2015-01-29 | Cummins Emission Solutions, Inc. | Urea Solution Pumps Having Leakage Bypass |
US9938875B2 (en) | 2011-08-22 | 2018-04-10 | Cummins Emission Solutions, Inc. | Urea injection systems valves |
US10087804B2 (en) * | 2011-08-22 | 2018-10-02 | Cummins Emission Solutions, Inc. | Urea solution pumps having leakage bypass |
CN103362793A (en) * | 2013-07-26 | 2013-10-23 | 胜瑞兰工业设备(苏州)有限公司 | Woven wire mesh membrane leakage guide device |
WO2015054598A1 (en) * | 2013-10-11 | 2015-04-16 | Checkpoint Fluidic Systems International, Ltd. | Scalable pumping mechanism utilizing anti-synchronized poly-diaphragm stack |
US10914299B2 (en) | 2016-01-27 | 2021-02-09 | Dipl. Ing. Ernst Schmitz Gmbh & Co. Kg Maschinen Und Apparatebau | Diaphragm pump comprising dust suction from below |
WO2018036979A1 (en) * | 2016-08-25 | 2018-03-01 | Siemens Aktiengesellschaft | Double membrane for a dust pump |
US10781807B2 (en) | 2016-08-25 | 2020-09-22 | Dipl. Ing. Ernst Schmitz Gmbh & Co. Kg Maschinen Und Apparatebau | Double membrane for a dust pump |
US11215174B2 (en) | 2016-08-25 | 2022-01-04 | Dipl. Ing. Ernst Schmitz Gmbh & Co. Kg Maschinen Und Apparatebau | Diaphragm pump having a porous, arched aluminum filter |
US11590440B2 (en) | 2016-08-25 | 2023-02-28 | Dipl. Ing. Ernst Schmitz GmbH & Co. KG Maschinen and Apparatebau | Production of a porous aluminum filter for a diaphragm pump |
Also Published As
Publication number | Publication date |
---|---|
ATE148202T1 (en) | 1997-02-15 |
JP3133067B2 (en) | 2001-02-05 |
EP0582628B1 (en) | 1997-01-22 |
EP0582628A1 (en) | 1994-02-16 |
JPH06506998A (en) | 1994-08-04 |
DE59207956D1 (en) | 1997-03-06 |
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