EP0775825A2 - Membrane de pompe - Google Patents

Membrane de pompe Download PDF

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Publication number
EP0775825A2
EP0775825A2 EP96308482A EP96308482A EP0775825A2 EP 0775825 A2 EP0775825 A2 EP 0775825A2 EP 96308482 A EP96308482 A EP 96308482A EP 96308482 A EP96308482 A EP 96308482A EP 0775825 A2 EP0775825 A2 EP 0775825A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm
central
peripheral
working
portions
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.)
Withdrawn
Application number
EP96308482A
Other languages
German (de)
English (en)
Other versions
EP0775825A3 (fr
Inventor
Stephen D. Able
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.)
Ingersoll Rand Co
Original Assignee
Ingersoll Rand Co
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 Ingersoll Rand Co filed Critical Ingersoll Rand Co
Publication of EP0775825A2 publication Critical patent/EP0775825A2/fr
Publication of EP0775825A3 publication Critical patent/EP0775825A3/fr
Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to a pump diaphragm for a fluid operated diaphragm pump and more particularly to a pump diaphragm for an air operated diaphragm pump where the diaphragm includes means for reducing pump diaphragm failure due to fatigue.
  • Diaphragms are used in air operated diaphragm pumps to pump a liquid at a flow rate that typically does not exceed 250 gal/min. (946.25 l/min.).
  • the diaphragms used in such diaphragm pumps are relatively flexible membranes that have an outer peripheral portion that is clamped or otherwise held in a stationary position against the pump housing.
  • Such diaphragms also include a centrally located portion and a working portion that joins the central and peripheral portions. The central portion is sandwiched between a pair of clamping washers or the like during operation of the pump.
  • the working and central portions of the diaphragm are displaced in a reciprocating manner along an axis to drive liquid out of the pump. Corners are defined where the working portion joins the peripheral portion and the central portion.
  • a diaphragm rod or other rigid connection member is connected at one end to the washers along the diaphragm central portion, and extends through the diaphragm, and is operatively connected to a mechanical means for cycling the diaphragm in a reciprocating manner.
  • the useful life of a diaphragm can range from 10 - 20 million cycles. Whether the useful life of a diaphragm is maximised or minimised is dependent mainly on the pressure of the liquid pumped, the pressure of the driving fluid, and the volume of abrasives contained in the liquid handled by the pump.
  • Diaphragm failure is most frequently caused by fatigue.
  • the fatigue is a result of bending stresses which are imparted on the diaphragm as the diaphragm is cycled during pump operation.
  • the bending stresses are highest at the corners that are formed where the working portion joins the peripheral and central portions. Fatigue failure is believed to initiate in the corners and propagate radially toward the centre of the diaphragm.
  • abrasives can scratch the diaphragm body. Frequently these scratches are produced by abrasives which have accumulated in the corners of the diaphragm. These scratches greatly increase the stress concentration in the corners, accelerate fatigue failure and significantly reduce the useful life of the pump diaphragm.
  • a diaphragm for a fluid pump comprising a unitary diaphragm body having a central portion, a peripheral portion and a working portion joining the peripheral and central portions; characterised in that the peripheral portion and central portions each have a thickness that is greater than the thickness of at least part of the working portion.
  • a flexible diaphragm for an air operated pump comprising a central portion, a peripheral portion and a working portion joining the central and peripheral portions; characterised by means for limiting the effects of stresses in the working, central and peripheral portions, said means being located substantially where the working portion joins the central and peripheral portions.
  • the pump diaphragm shown in Figures 1 and 2 is indicated generally at 10.
  • the side of the diaphragm generally indicated at 11 in Figure 2 is a liquid receiving side and the diaphragm side generally indicated at 13 is an air pressure receiving side.
  • the diaphragm includes a peripheral portion 12 that is clamped or otherwise held stationary by a pump housing 50 during operation of the pump.
  • a plurality of apertures 14 are provided in the peripheral portion.
  • the apertures are oriented in a circular array along the portion 12 and are equi-spaced from one another.
  • the apertures are for receiving a conventional connection member such as a bolt, pin or the like.
  • the diaphragm 10 has a central portion 16 having an opening 18 located at approximately the centre of the diaphragm.
  • the central portion is sandwiched between a pair of clamping washers 51 each including a centrally positioned opening to be aligned with the diaphragm opening 18.
  • the openings in the clamping washers and central diaphragm portion are adapted to receive an end of a diaphragm rod (not shown) or other member for moving a working portion 20 and the central portion 16 in a reciprocating manner, relative to the fixed peripheral portion 12, along an axis 21 in the direction shown by arrow 32.
  • One end of the diaphragm rod is connected to the clamping washers at the diaphragm central portion and may also be either operatively connected to a mechanical driving means or to a second diaphragm.
  • the annular working portion 20 joins the central and peripheral portions 16 and 12. As shown in Figure 2, the annular working portion has an arcuate cross section that is directed outwardly away from the peripheral and central portions and towards the liquid receiving side 11 of the diaphragm 10.
  • An inner corner 22 is defined by the working and central portions where the working portion joins the central portion.
  • An outer corner area 24 is defined by the working and peripheral portions where the working portion joins the peripheral portion. As shown in dashed font in Figure 1, both the inner and outer corners 22 and 24 form circular paths and extend completely around the body of the diaphragm. During pump operation, bending stresses in the diaphragm are greatest at the corners 22 and 24 and scratches caused by abrasives in the pumped liquid tend to form most frequently in the corners.
  • the diaphragm includes first and second skirt members 26 and 28 along the liquid receiving side 11 of the diaphragm 10.
  • the first skirt member 26 extends substantially across the peripheral portion 12, outer corner 24 and a portion of the working portion adjacent the peripheral portion 12.
  • the skirt member 26 may completely cover the peripheral portion 12 or may only cover a portion of the surface area defined by the peripheral portion. Apertures 14 are not covered by the first skirt member 26.
  • the second skirt member 28 covers substantially all of the central portion 16, the inner corner 22 and a portion of the working portion 20 adjacent the central portion 16.
  • the second skirt does not cover the opening 18, and although the second skirt member is shown as covering substantially all of the central portion, it need only cover a portion of the central portion 16.
  • the diaphragm may include only one of the skirts members 26 and 28 or may include both of the skirt members as shown in Figures 1 and 2.
  • the skirt members may extend in a full circle along the surface of the diaphragm or may only extend in a partial circle and cover only a portion of the diaphragm surface.
  • skirt members do not extend completely over the working portion 20, they do not affect the operation of the diaphragm. It is recommended that the skirt members cover about half of the working portion and not a majority of the working portion.
  • the skirt members increase the useful life of the diaphragm by reducing the bending stresses at the diaphragm corners and also by preventing the accumulation of a high concentration of abrasives at both of the corners.
  • the diaphragm 10 may be made from any suitable material such as the material known and sold under the trade mark "Teflon", a thermoplastic material or rubber.
  • the skirt members 26 and 28 may be made from the same material as the diaphragm body or from a different material. It is recommended that the skirt member be one to two times the thickness of the diaphragm.
  • skirt members are located on the portions of the diaphragm which experience the largest number of scratches, it is likely any diaphragm scratches will be formed in the skirt members, and will not affect the corners. In this way, it is believed the scratches will not increase the stresses at the corners and accelerate failure of the diaphragm. Therefore, pump diaphragms which include one or both of the skirt members will be able to sustain scratches without increasing stress at the corners and decreasing the useful life of the diaphragm.
  • diaphragm 40 is shown in the enlarged sectional view of Figure 3 and includes the peripheral portion 12, central portion 16 and working portion 20 joining the central and peripheral portions.
  • the diaphragm 40 also includes a liquid receiving side 11 and an air pressure side 13.
  • the diaphragm peripheral portion is held in place during pump operation by the pump housing 50 and the central portion is sandwiched between the clamping washers 51, as previously described.
  • the peripheral and central portions 12 and 16 have a thickness "T", which is greater than the thickness "t" of the working portion 20.
  • the thickness "T" of the peripheral and central portions may be twice the thickness "t”.
  • Increasing the thickness of the diaphragm portions 12 and 16 helps to minimise the effects of scratches which may form along the central and peripheral portions near the working portion, and also reduce the effects of diaphragm bending stresses.
  • both the central and peripheral portions 16 and 12 may have a thickness that is greater than the thickness of the working portion or only one of the portions may be of greater thickness. In this way, at least one of the portions 12 or 16 has a thickness that is greater than the thickness of the working portion.
  • An inner stress reducing notch 41 is formed where the central portion joins the working portion and an outer stress reducing notch 42 is formed where the peripheral portion joins the working portion.
  • Each notch is U-shaped; however, the notch may have any suitable shape.
  • the notches extend completely around the diaphragm in the same manner that the corners 22 and 24 extend around the diaphragm 10. The notches reduce the stress concentration in the central and peripheral portions, which are the portions of the diaphragm 40 which experience the largest magnitude of bending stresses during pump operation.
  • the diaphragm 40 may include both notches 41 and 42 or may include only one of the notches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP96308482A 1995-11-27 1996-11-25 Membrane de pompe Withdrawn EP0775825A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US56302995A 1995-11-27 1995-11-27
US563029 1995-11-27

Publications (2)

Publication Number Publication Date
EP0775825A2 true EP0775825A2 (fr) 1997-05-28
EP0775825A3 EP0775825A3 (fr) 1998-06-10

Family

ID=24248812

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96308482A Withdrawn EP0775825A3 (fr) 1995-11-27 1996-11-25 Membrane de pompe

Country Status (2)

Country Link
EP (1) EP0775825A3 (fr)
JP (1) JPH09184484A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916846A3 (fr) * 1997-11-18 1999-06-09 Westinghouse Air Brake Company Anneau d'usure pour une membrane et support en forme de piston
FR2780476A1 (fr) * 1998-06-30 1999-12-31 Peugeot Dispositif de transmission d'un volume de fluide sous pression et membrane pour un tel dispositif
US6742997B2 (en) * 2001-12-05 2004-06-01 Yamada Corporation Diaphragm-type pumping apparatus
US9084845B2 (en) 2011-11-02 2015-07-21 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US9901664B2 (en) 2012-03-20 2018-02-27 Smith & Nephew Plc Controlling operation of a reduced pressure therapy system based on dynamic duty cycle threshold determination
US9956121B2 (en) 2007-11-21 2018-05-01 Smith & Nephew Plc Wound dressing
US10299964B2 (en) 2012-05-15 2019-05-28 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10307517B2 (en) 2010-09-20 2019-06-04 Smith & Nephew Plc Systems and methods for controlling operation of a reduced pressure therapy system
US10682446B2 (en) 2014-12-22 2020-06-16 Smith & Nephew Plc Dressing status detection for negative pressure wound therapy
US12029549B2 (en) 2007-12-06 2024-07-09 Smith & Nephew Plc Apparatus and method for wound volume measurement
US12097095B2 (en) 2011-05-26 2024-09-24 Smith & Nephew, Inc. Method and apparatus for providing negative pressure to a negative pressure wound therapy bandage

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB544013A (en) * 1940-09-23 1942-03-24 Emile Bernard Bates An improved diaphragm pump
US3276389A (en) * 1965-08-06 1966-10-04 Panther Pump & Equipment Co In Balanced pressure pump
FR2418352A1 (fr) * 1978-02-27 1979-09-21 Joint Francais Membrane de pompe
US4238992A (en) * 1978-10-30 1980-12-16 Wilden Pump & Engineering Co. Pump diaphragm
GB2036166B (en) * 1978-12-07 1982-12-08 Warwick Pump & Eng Co High pressure pump
NZ205100A (en) * 1983-08-01 1987-04-30 Flynn L W & Co Ltd Diaphram pump with diaphram having central portion off-set axially from periphery
US4864918A (en) * 1986-11-07 1989-09-12 The Gates Rubber Company Thermoplastic diaphragm
DE8702941U1 (de) * 1987-02-26 1987-05-07 DEPA Gesellschaft für Verfahrenstechnik mbH, 4000 Düsseldorf Doppelmembranpumpe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0916846A3 (fr) * 1997-11-18 1999-06-09 Westinghouse Air Brake Company Anneau d'usure pour une membrane et support en forme de piston
FR2780476A1 (fr) * 1998-06-30 1999-12-31 Peugeot Dispositif de transmission d'un volume de fluide sous pression et membrane pour un tel dispositif
WO2000000743A1 (fr) * 1998-06-30 2000-01-06 Automobiles Peugeot Pompe a membrane et membrane pour une telle pompe
US6742997B2 (en) * 2001-12-05 2004-06-01 Yamada Corporation Diaphragm-type pumping apparatus
US9956121B2 (en) 2007-11-21 2018-05-01 Smith & Nephew Plc Wound dressing
US10744041B2 (en) 2007-11-21 2020-08-18 Smith & Nephew Plc Wound dressing
US10016309B2 (en) 2007-11-21 2018-07-10 Smith & Nephew Plc Wound dressing
US12491121B2 (en) 2007-11-21 2025-12-09 Smith & Nephew Plc Wound dressing
US10231875B2 (en) 2007-11-21 2019-03-19 Smith & Nephew Plc Wound dressing
US11364151B2 (en) 2007-11-21 2022-06-21 Smith & Nephew Plc Wound dressing
US11351064B2 (en) 2007-11-21 2022-06-07 Smith & Nephew Plc Wound dressing
US10555839B2 (en) 2007-11-21 2020-02-11 Smith & Nephew Plc Wound dressing
US11179276B2 (en) 2007-11-21 2021-11-23 Smith & Nephew Plc Wound dressing
US11129751B2 (en) 2007-11-21 2021-09-28 Smith & Nephew Plc Wound dressing
US12029549B2 (en) 2007-12-06 2024-07-09 Smith & Nephew Plc Apparatus and method for wound volume measurement
US11623039B2 (en) 2010-09-20 2023-04-11 Smith & Nephew Plc Systems and methods for controlling operation of a reduced pressure therapy system
US11534540B2 (en) 2010-09-20 2022-12-27 Smith & Nephew Plc Pressure control apparatus
US12226611B2 (en) 2010-09-20 2025-02-18 Smith & Nephew Plc Pressure control apparatus
US11027051B2 (en) 2010-09-20 2021-06-08 Smith & Nephew Plc Pressure control apparatus
US10307517B2 (en) 2010-09-20 2019-06-04 Smith & Nephew Plc Systems and methods for controlling operation of a reduced pressure therapy system
US12097095B2 (en) 2011-05-26 2024-09-24 Smith & Nephew, Inc. Method and apparatus for providing negative pressure to a negative pressure wound therapy bandage
US12582762B2 (en) 2011-11-02 2026-03-24 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US9084845B2 (en) 2011-11-02 2015-07-21 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US11648342B2 (en) 2011-11-02 2023-05-16 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US11253639B2 (en) 2011-11-02 2022-02-22 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US10143783B2 (en) 2011-11-02 2018-12-04 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
US9901664B2 (en) 2012-03-20 2018-02-27 Smith & Nephew Plc Controlling operation of a reduced pressure therapy system based on dynamic duty cycle threshold determination
US11730877B2 (en) 2012-03-20 2023-08-22 Smith & Nephew Plc Controlling operation of a reduced pressure therapy system based on dynamic duty cycle threshold determination
US10881764B2 (en) 2012-03-20 2021-01-05 Smith & Nephew Plc Controlling operation of a reduced pressure therapy system based on dynamic duty cycle threshold determination
US10299964B2 (en) 2012-05-15 2019-05-28 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10702418B2 (en) 2012-05-15 2020-07-07 Smith & Nephew Plc Negative pressure wound therapy apparatus
US12116991B2 (en) 2012-05-15 2024-10-15 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10682446B2 (en) 2014-12-22 2020-06-16 Smith & Nephew Plc Dressing status detection for negative pressure wound therapy
US11654228B2 (en) 2014-12-22 2023-05-23 Smith & Nephew Plc Status indication for negative pressure wound therapy
US10737002B2 (en) 2014-12-22 2020-08-11 Smith & Nephew Plc Pressure sampling systems and methods for negative pressure wound therapy
US10973965B2 (en) 2014-12-22 2021-04-13 Smith & Nephew Plc Systems and methods of calibrating operating parameters of negative pressure wound therapy apparatuses
US10780202B2 (en) 2014-12-22 2020-09-22 Smith & Nephew Plc Noise reduction for negative pressure wound therapy apparatuses

Also Published As

Publication number Publication date
JPH09184484A (ja) 1997-07-15
EP0775825A3 (fr) 1998-06-10

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