EP1323924A2 - Membrane de pompe partiellement prétendue - Google Patents

Membrane de pompe partiellement prétendue Download PDF

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Publication number
EP1323924A2
EP1323924A2 EP02258415A EP02258415A EP1323924A2 EP 1323924 A2 EP1323924 A2 EP 1323924A2 EP 02258415 A EP02258415 A EP 02258415A EP 02258415 A EP02258415 A EP 02258415A EP 1323924 A2 EP1323924 A2 EP 1323924A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm
attachment portion
plane
distance
diaphragm according
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Withdrawn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
EP02258415A
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German (de)
English (en)
Other versions
EP1323924A3 (fr
Inventor
Stephen D. Able
Thomas R. Headley
Gerald M. Distel
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 EP1323924A2 publication Critical patent/EP1323924A2/fr
Publication of EP1323924A3 publication Critical patent/EP1323924A3/fr
Withdrawn legal-status Critical Current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
    • F04B43/0054—Special features particularities of the flexible members

Definitions

  • This invention relates to diaphragms for such uses as air-operated or mechanically operated diaphragm pumps, brake actuators or other diaphragm-operated devices in which a central plate or plates is connected to or makes contact with the central portion of the diaphragm.
  • Diaphragm pumps are widely used in pumping a wide variety of materials including materials which are abrasive, have high viscosity, or consist of slurries that might damage other pump designs. Diaphragm pumps are often air driven which is advantageous in pumping flammable liquids or in environments where electrically driven equipment could otherwise be hazardous. Electrically or otherwise mechanically driven diaphragm pump designs, however, are also utilised.
  • the pump diaphragm is the critical driving member of the diaphragm pump and is a relatively flexible membrane that has an outer attachment 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 inner attachment and outer attachment portions.
  • the inner attachment portion is clamped between a pair of clamping washers or the like during operation of the pump.
  • the working and inner attachment portions of the diaphragm are displaced in a reciprocating manner along an axis to drive liquid out of the pump.
  • Fig. 3 Shown in Fig. 3 is an example of a conventional rubber diaphragm 9 shown having a dish shape with an inner attachment portion 6, an outer attachment portion 2 which may be dovetailed or beaded for retention in an associated pump housing, and an innerconnecting flexure sidewall working portion 4. Fabric reinforcement must be embedded in the body of these diaphragms to achieve adequate flex fatigue life, which drives up the cost. If the reinforcing fabric is not uniformly encased inside of the rubber, however, premature diaphragm failure may still occur. In certain applications the lack of chemical resistance presents problems as well.
  • thermoplastic polyurethane diaphragms have also been used as pump diaphragms. These polyurethane diaphragms have been constructed with a generally curvilinear flexure sidewall incorporating concentric ribs, terminating in an outer beaded flange and radially inward bead for mounting to a split piston plate.
  • TPE thermoplastic elastomers
  • EPDM ethylene propylene
  • PTFE polytetrafluoroethylene
  • a partially preloaded diaphragm comprising an outer attachment portion defining a first plane and disposed about an axis substantially perpendicular to said first plane, and an inner attachment portion disposed substantially perpendicular to said axis of said outer attachment portion and defining a second plane, said inner attachment portion being movable away from said outer attachment portion into a fully extended pumping position defining a third plane, said first plane and said second plane being spaced at a distance to define a preload distance when said diaphragm is at rest, and said first and third plane being spaced to define a pump stroke distance when said diaphragm is fully extended, said preload distance being from about 25 percent to about 85 percent of said pump stroke distance.
  • diaphragm means a flexible barrier that divides two fluid containing chambers or compartments. Typically, such barriers are useful with diaphragm pumps, however, these diaphragms may also be employed as a barrier layer between two compartments in any application where a fluid exists in one compartment and would cause deleterious effects if present in the other compartment.
  • preloaded diaphragms means a diaphragm that in a free state has inner and outer attachment portions that are not substantially coplanar.
  • preloaded TPE diaphragms Unlike fabric-reinforced rubber diaphragms that can be easily inverted by hand, preloaded TPE diaphragms generally require the use of assembly fixtures such as a chain fall or press to overcome the preload in the diaphragm in order to clamp the outer attachment portion between housing portions.
  • assembly fixtures such as a chain fall or press
  • Another problem encountered when using stiff preloaded diaphragms was buckling of the diaphragm when inverted during installation. This buckling caused the formation of typically six or eight radial wrinkles in the working portion of the diaphragm. Because each fold or wrinkle in the working portion is known to be a natural place for the premature formation of a crack, the buckling that occurs is believed to have a detrimental effect on diaphragm life.
  • the present inventors similarly considered moulding a diaphragm with the inner and outer attachment portions in a coplanar configuration, i.e., without a preload, like that shown in Fig. 1.
  • stiffer materials such as TPE
  • the extra force required to deform such a diaphragm as it approaches the fully extended position becomes significant and can result in a pressure loss from the air to the liquid side of the pump.
  • the diaphragm performs work on the fluid being pumped by force transfer.
  • the force transferred to the liquid side of the diaphragm is the air pressure times the area of the diaphragm minus frictional losses, minus the force to extend each diaphragm.
  • the pressure loss of the air causes a decreasing output fluid pressure as the diaphragm moves into its forward pumping position.
  • a partially preloaded diaphragm having outer and inner attachment portions spaced at a distance to define a preload distance when the diaphragm is at rest, of from about 25 percent to about 85 percent of the pump stroke distance.
  • Shown in Fig. 8 is a graph illustrating the output fluid pressure curves obtained for a given motive (input) air pressure curve for a forward pumping stroke using two SANTOPRENE® TPE diaphragms, one having a conventional configuration with coplanar inner and outer attachment portions shown in Fig. 1, and the other having a partially preloaded configuration shown in Fig. 2 according to the present invention.
  • the output fluid pressure obtained using the partially preloaded configuration results in an output fluid pressure that substantially corresponds to the motive air (input) pressure while the prior art coplanar configuration has a decreasing output fluid pressure as the diaphragm moves to the forward position in its stroke.
  • This pressure loss is due to the air pressure needed to extend the inner attachment portion from its coplanar position with the outer attachment portion.
  • Diaphragm 10 Shown in Figs. 2, 4, and 5-7 is a pump diaphragm 10 that is partially preloaded according to the present invention.
  • Diaphragm 10 includes a outer attachment portion 12 that is clamped or otherwise attached and held stationary between pump housing sections 50 and 53 during operation of the pump as shown sequentially in Figs. 5-7.
  • outer attachment portion 12 is adapted for attachment to a pump.
  • outer attachment portion 12 can be formed with an enlarged bead, or a dovetailed portion as shown or may alternately be provided with a plurality of holes for receiving fastening members to retain the diaphragm in the pump housing.
  • Diaphragm 10 also includes an inner attachment portion 16 having an opening 18 located at approximately the centre of the diaphragm.
  • an annular working portion 20 connects the outer and inner attachment portions.
  • inner attachment portion 16 is attached to a pump to define a motive fluid chamber 49 and a pumping fluid chamber 54 by clamping between a pair of clamping washers 51, 52 each having a centrally positioned opening to be aligned with diaphragm opening 18.
  • the openings in clamping washers 51, 52 and inner attachment portion 16 are adapted to attach to an end of a diaphragm rod 36 or other member for moving the annular working portion 20 and the inner attachment portion 16 in a reciprocating manner, relative to the fixed outer attachment portion 12, along axis 21.
  • diaphragm rod 36 is connected to clamping washers 51, 52 at diaphragm inner attachment portion 16 by a threaded bolt 37 passing therethrough as shown.
  • Diaphragm rod 36 may also be either operatively connected to a mechanical driving means or may be connected to a second diaphragm.
  • outer attachment portion 12 defines a first plane (P) and is disposed about an axis 21 that is substantially perpendicular to the first plane.
  • Inner attachment portion 16 is disposed substantially perpendicular to axis 21 of the outer attachment portion 12 and defines a second plane (C).
  • Inner attachment portion 16 is movable away from the outer attachment portion 12 into a fully extended pumping position defining a third plane (F).
  • the first plane (P) and the second plane (C) are spaced at a distance to define a preload distance (PC) when the diaphragm is at rest.
  • the first plane (P) and third plane (F) are spaced to define a pump stroke distance (PF) when the diaphragm is fully extended with the preload distance (PC) being from about 25 percent to about 85 percent of the pump stroke distance.
  • the preload distance is from about 50 percent to about 75 percent of the pump stroke distance with most preferred loading being at 67 percent.
  • annular working portion 20 is provided in a convoluted form shown in Figs. 2 and 6 comprising empirically derived radii such that when inner attachment portion 16 is moved to the fully extended position (shown in Fig. 7), the annular working portion 20 is stretched to form a linear wall.
  • the radii of annular working portion 20 are provided such that, when inner attachment portion 16 is in the fully extended position, a peripheral portion 17 forms annularly between the inner attachment portion 16 and the annular working portion 20.
  • the convoluted portion of annular working portion 20 is preferably spaced from outer attachment portion 12 as shown to reduce wear caused by pump housing sections 50 and 53 during operation of the pump.
  • the useful life of the partially preloaded diaphragm may be further enhanced by reducing the amount of excess material to reduce the tendency of the diaphragm to buckle during mid-stroke.
  • the chord length of annular working portion 20 is, preferably, the minimum that is needed to prevent overstressing at the end of the stroke.
  • diaphragms having an annular working portion 20 that stretches to form peripheral portion 17, described above and shown in Figure 7, is most preferred because it achieves this reduction in diaphragm material.
  • thermoplastic elastomers which may be employed include SANTOPRENE® blend of EPDM rubber and polypropylene (available from Advanced Elastomer Systems, Akron, OH), HYLENE® diisocyanate and HYTREL® polyester elastomers (available from DuPont Company, Wilmington, DE), GEOLAST® polypropylene and nitrile rubber blend (available from Advanced Elastomer Systems, Akron, OH), SARLINK® elastomer (available from DSM Elastomers, The Netherlands), and various thermoplastic urethanes including polyether and polyester based polyurethanes, such as ESTANE® thermoplastic polyurethane (available from B F Goodrich, Cleveland, OH).
  • SANTOPRENE® blend of EPDM rubber and polypropylene available from Advanced Elastomer Systems, Akron, OH
  • HYLENE® diisocyanate and HYTREL® polyester elastomers available from DuPont Company, Wilmington, DE
  • thermoplastic elastomers A suitable listing of usable thermoplastic elastomers is given in "Elastomerics,” Oct. 1986, v. 118, no. 10. pp. 13-19. Although the polyurethanes yield superior abrasion resistance and have excellent flexing properties, SANTOPRENE® thermoplastic elastomer is preferred for many applications because of lower cost, and long flex life when employing the preferred wall design. The thermoplastic elastomers provide advantages of both thermoplastics and elastomers separately. Additionally, fluoropolymers such as TEFLON® polytetrafluoro-ethylene (available from DuPont Company, Wilmington, DE) may also be employed in the diaphragms.
  • TEFLON® polytetrafluoro-ethylene available from DuPont Company, Wilmington, DE
  • diaphragms of other materials with similar or greater stiffnesses may be utilised to improve their useful flexure lives.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP02258415A 2001-12-19 2002-12-05 Membrane de pompe partiellement prétendue Withdrawn EP1323924A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27422 1987-03-18
US10/027,422 US20030110939A1 (en) 2001-12-19 2001-12-19 Partially preloaded pump diaphragms

Publications (2)

Publication Number Publication Date
EP1323924A2 true EP1323924A2 (fr) 2003-07-02
EP1323924A3 EP1323924A3 (fr) 2003-11-26

Family

ID=21837647

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02258415A Withdrawn EP1323924A3 (fr) 2001-12-19 2002-12-05 Membrane de pompe partiellement prétendue

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US (1) US20030110939A1 (fr)
EP (1) EP1323924A3 (fr)
CA (1) CA2413376A1 (fr)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6901960B2 (en) * 2002-09-06 2005-06-07 Ingersoll-Rand Company Double diaphragm pump including spool valve air motor
US6865981B2 (en) * 2003-03-11 2005-03-15 Ingersoll-Rand Company Method of producing a pump
US6883417B2 (en) * 2003-03-19 2005-04-26 Ingersoll-Rand Company Connecting configuration for a diaphragm in a diaphragm pump
HUE041864T2 (hu) 2007-11-21 2019-06-28 Smith & Nephew Sebkötözõ
GB0723855D0 (en) 2007-12-06 2008-01-16 Smith & Nephew Apparatus and method for wound volume measurement
CH702436A1 (fr) * 2009-12-23 2011-06-30 Jean-Denis Rochat Pompe doseuse a usage medical.
CH702437A1 (fr) * 2009-12-23 2011-06-30 Jean-Denis Rochat Pompe volumetrique alternative a membrane pour usage medical.
GB201015656D0 (en) 2010-09-20 2010-10-27 Smith & Nephew Pressure control apparatus
US8596648B2 (en) * 2010-10-22 2013-12-03 Oshkosh Corporation Pump for vehicle suspension system
US9067003B2 (en) 2011-05-26 2015-06-30 Kalypto Medical, Inc. Method for providing negative pressure to a negative pressure wound therapy bandage
US9084845B2 (en) 2011-11-02 2015-07-21 Smith & Nephew Plc Reduced pressure therapy apparatuses and methods of using same
CN104507513B (zh) 2012-03-20 2017-04-12 史密夫及内修公开有限公司 基于动态占空比阈值确定的减压治疗系统的控制操作
US9427505B2 (en) 2012-05-15 2016-08-30 Smith & Nephew Plc Negative pressure wound therapy apparatus
US20140134019A1 (en) * 2012-11-15 2014-05-15 Mindray Medical Sweden Ab Magnetic circuit
CN107249524A (zh) 2014-12-22 2017-10-13 史密夫及内修公开有限公司 负压伤口治疗装置和方法
WO2017177174A1 (fr) 2016-04-08 2017-10-12 Oshkosh Corporation Système de mise à niveau pour dispositif de levage
JP6895493B2 (ja) * 2019-08-27 2021-06-30 株式会社タクミナ ダイヤフラムポンプ
DE102020125567A1 (de) * 2020-09-30 2022-03-31 Ulman Dichtungstechnik Gmbh Verbundmembran für Membranpumpen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011758A (en) 1958-05-01 1961-12-05 Hills Mccanna Co Valve diaphragms

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3813500A1 (de) * 1988-04-22 1989-11-02 Alkor Gmbh Membranpumpe oder membrankompressor
DE9306501U1 (de) * 1993-04-29 1993-09-02 ASF, Gesellschaft für elektrotechnische Geräte mbH, 82178 Puchheim Membrane für eine Membranpumpe zum Fördern eines brennbaren Fluids
DE9403103U1 (de) * 1994-02-24 1994-04-14 ASF, Gesellschaft für elektrotechnische Geräte mbH, 82178 Puchheim Membrane für eine Membranpumpe zum Fördern eines brennbaren Fluids
US5996470A (en) * 1997-11-18 1999-12-07 Westinghouse Air Brake Company Wear ring for diaphragm and outer piston

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011758A (en) 1958-05-01 1961-12-05 Hills Mccanna Co Valve diaphragms

Also Published As

Publication number Publication date
CA2413376A1 (fr) 2003-06-19
EP1323924A3 (fr) 2003-11-26
US20030110939A1 (en) 2003-06-19

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