EP0809028A2 - Neutral shaped pump diaphragm - Google Patents

Neutral shaped pump diaphragm Download PDF

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Publication number
EP0809028A2
EP0809028A2 EP97303541A EP97303541A EP0809028A2 EP 0809028 A2 EP0809028 A2 EP 0809028A2 EP 97303541 A EP97303541 A EP 97303541A EP 97303541 A EP97303541 A EP 97303541A EP 0809028 A2 EP0809028 A2 EP 0809028A2
Authority
EP
European Patent Office
Prior art keywords
diaphragm
pump
shape
neutral
pump 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.)
Withdrawn
Application number
EP97303541A
Other languages
German (de)
French (fr)
Other versions
EP0809028A3 (en
Inventor
Sheila S. Mckee
Ronald M. Markusson
Kathleen M. Barnes
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.)
Graco Inc
Original Assignee
Graco Inc
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 Graco Inc filed Critical Graco Inc
Publication of EP0809028A2 publication Critical patent/EP0809028A2/en
Publication of EP0809028A3 publication Critical patent/EP0809028A3/en
Withdrawn legal-status Critical Current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
    • 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
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
    • F04B45/041—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms double acting plate-like flexible pumping member
    • 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
    • F04B45/00—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids
    • F04B45/04—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms
    • F04B45/043—Pumps or pumping installations having flexible working members and specially adapted for elastic fluids having plate-like flexible members, e.g. diaphragms two or more plate-like pumping flexible members in parallel
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/22—Arrangements for enabling ready assembly or disassembly

Definitions

  • Air operated double diaphragm pumps of various sorts have been known and used for many years. Such pumps typically utilize a pair of diaphragms molded from various materials depending upon the chemical compatibility required for the pump.
  • the diaphragms are typically molded in a hat shaped configuration. Because one side of the diaphragm is designed to face the fluid and the other to face the air chamber, when assembling the pump it is generally necessary to turn one of the "hats" inside out for assembly. In larger pump sizes, this requirement may be especially difficult.
  • the diaphragm is molded in an "S" shape which corresponds to the shape of the diaphragm in the center (of the pump stroke) or relaxed position.
  • diaphragms should also lead to increased life of the diaphragm. There is less chance for the diaphragm to rub and be abraded on either the fluid cover or air cover housings. Further, the maximum distance that the diaphragm will flex is substantially less than with diaphragms manufactured according to current practice. Improved diaphragm life due to reduced applied stress at pump stroke changeover will result as the diaphragm profile facilitates a natural roll motion through the peak stress points in pump operation. Proportionally larger arc segments can be used in this diaphragm profile cross-section as well to improve the flex life of diaphragms.
  • the diaphragm as shown in the attached drawing is made of a rubber material (such as VITONTM) having a nylon fabric reinforcement and is manufactured using a compression molding process. Of course this same technique may be used for diaphragms made of other materials as well. For a 14 inch diameter diaphragm in a 3 inch pump, the diaphragm has a nominal thickness of .160 inches.
  • Figure 1 is a front view of the diaphragm of the instant invention.
  • Figure 2 is a sectional view taken along line 2-2 of Figure 1.
  • Figure 3 shows the diaphragm in its relaxed position in solid and at the two extreme positions in phantom.
  • the diaphragm 10 is molded in an "S" shape which corresponds to the shape of the diaphragm in the center (of the pump stroke) or relaxed position.
  • S the shape of the diaphragm in the center (of the pump stroke) or relaxed position.
  • the diaphragm 10 as shown in the attached drawings is made of a rubber material (such as VITONTM having a nylon fabric reinforcement and is manufactured using a compression molding process. Of course this same technique may be used for diaphragms made of other materials as well. For a 14 inch diameter diaphragm in a 3 inch pump, the diaphragm has a nominal thickness of .160 inches.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)

Abstract

In the invention, the diaphragm for an air-operated double diaphragm pump is molded in an "S" shape which corresponds to the shape of the diaphragm in the center (of the pump stroke) or relaxed position. By allowing the pump to be assembled in this center or relaxed position, the diaphragm need not be flexed in order to perform the pump assembly.

Description

    BACKGROUND OF THE INVENTION
  • Air operated double diaphragm pumps of various sorts have been known and used for many years. Such pumps typically utilize a pair of diaphragms molded from various materials depending upon the chemical compatibility required for the pump. The diaphragms are typically molded in a hat shaped configuration. Because one side of the diaphragm is designed to face the fluid and the other to face the air chamber, when assembling the pump it is generally necessary to turn one of the "hats" inside out for assembly. In larger pump sizes, this requirement may be especially difficult.
    • SUMMARY OF THE INVENTION
  • It is therefore an object of this invention to provide a diaphragm for such pumps which will ease the assembly of such pumps and which would exhibit increased life compared to prior art designs.
  • In the instant invention, the diaphragm is molded in an "S" shape which corresponds to the shape of the diaphragm in the center (of the pump stroke) or relaxed position. By allowing the pump to be assembled in this center or relaxed position, the diaphragm need not be flexed in order to perform the assembly.
  • The use of such diaphragms should also lead to increased life of the diaphragm. There is less chance for the diaphragm to rub and be abraded on either the fluid cover or air cover housings. Further, the maximum distance that the diaphragm will flex is substantially less than with diaphragms manufactured according to current practice. Improved diaphragm life due to reduced applied stress at pump stroke changeover will result as the diaphragm profile facilitates a natural roll motion through the peak stress points in pump operation. Proportionally larger arc segments can be used in this diaphragm profile cross-section as well to improve the flex life of diaphragms.
  • The diaphragm as shown in the attached drawing is made of a rubber material (such as VITON™) having a nylon fabric reinforcement and is manufactured using a compression molding process. Of course this same technique may be used for diaphragms made of other materials as well. For a 14 inch diameter diaphragm in a 3 inch pump, the diaphragm has a nominal thickness of .160 inches.
  • These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
    • A BRIEF DESCRIPTION OF THE DRAWINGS
  • Figure 1 is a front view of the diaphragm of the instant invention.
  • Figure 2 is a sectional view taken along line 2-2 of Figure 1.
  • Figure 3 shows the diaphragm in its relaxed position in solid and at the two extreme positions in phantom.
    • DESCRIPTION OF THE PREFERRED EMBODIMENT
  • In the instant invention, the diaphragm 10 is molded in an "S" shape which corresponds to the shape of the diaphragm in the center (of the pump stroke) or relaxed position. By allowing the pump to be assembled in this center or relaxed position, the diaphragm need not be flexed into the first 12 or second 14 extreme positions in order to perform the assembly.
  • The diaphragm 10 as shown in the attached drawings is made of a rubber material (such as VITON™ having a nylon fabric reinforcement and is manufactured using a compression molding process. Of course this same technique may be used for diaphragms made of other materials as well. For a 14 inch diameter diaphragm in a 3 inch pump, the diaphragm has a nominal thickness of .160 inches.
  • It is contemplated that various changes and modifications may be made to the diaphragm without departing from the spirit and scope of the invention as defined by the following claims.

Claims (3)

  1. A diaphragm for use in an air-operated double diaphragm pump, siad diaphragm flexing during use between first and second extreme positions, the improvement comprising said diaphragm being molded in a relaxed state so as to be shaped similar to the shape of said diaphragm intermediate said first and second positions.
  2. The diaphragm of claim 1 wherein said relaxed state shape is the shape of said diaphragm at a position equidistant from said first and second positions.
  3. The diaphragm of claim 1 wherein said diaphragm is S-shaped in cross-section.
EP97303541A 1996-05-23 1997-05-23 Neutral shaped pump diaphragm Withdrawn EP0809028A3 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US1862396P 1996-05-23 1996-05-23
US18623 1996-05-23
1996-11-18
US85913397A 1997-05-20 1997-05-20
US859133 1997-05-20

Publications (2)

Publication Number Publication Date
EP0809028A2 true EP0809028A2 (en) 1997-11-26
EP0809028A3 EP0809028A3 (en) 1999-06-02

Family

ID=26691311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97303541A Withdrawn EP0809028A3 (en) 1996-05-23 1997-05-23 Neutral shaped pump diaphragm

Country Status (3)

Country Link
EP (1) EP0809028A3 (en)
JP (1) JPH11159461A (en)
KR (1) KR970075365A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6276907B1 (en) 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump
WO2006092333A1 (en) * 2005-03-02 2006-09-08 Ami Agrolinz Melamine International Gmbh Diaphragm pump and method for the production thereof
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) 2021-12-17 2024-09-24 Smith & Nephew, Inc. Method and apparatus for providing negative pressure to a negative pressure wound therapy bandage

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5531038B2 (en) * 2012-02-16 2014-06-25 多田プラスチック工業株式会社 Diaphragm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906174A1 (en) * 1978-09-27 1980-04-10 Franz Borgias Dost Hand-operated membrane type air pump - has membrane with radial elasticity to give large movement between ends of stroke
EP0280070A2 (en) * 1987-02-26 1988-08-31 Depa Gesellschaft Für Verfahrenstechnik Mbh Double diaphragm pump
US4867653A (en) * 1988-01-20 1989-09-19 Grace Inc. Diaphragm pump
DE29505354U1 (en) * 1995-03-16 1995-06-22 ABEL GmbH & Co Handels- und Verwaltungsgesellschaft, 21514 Büchen Diaphragm piston pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2906174A1 (en) * 1978-09-27 1980-04-10 Franz Borgias Dost Hand-operated membrane type air pump - has membrane with radial elasticity to give large movement between ends of stroke
EP0280070A2 (en) * 1987-02-26 1988-08-31 Depa Gesellschaft Für Verfahrenstechnik Mbh Double diaphragm pump
US4867653A (en) * 1988-01-20 1989-09-19 Grace Inc. Diaphragm pump
DE29505354U1 (en) * 1995-03-16 1995-06-22 ABEL GmbH & Co Handels- und Verwaltungsgesellschaft, 21514 Büchen Diaphragm piston pump

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6276907B1 (en) 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump
WO2006092333A1 (en) * 2005-03-02 2006-09-08 Ami Agrolinz Melamine International Gmbh Diaphragm pump and method for the production thereof
US10744041B2 (en) 2007-11-21 2020-08-18 Smith & Nephew Plc Wound dressing
US9956121B2 (en) 2007-11-21 2018-05-01 Smith & Nephew Plc Wound dressing
US10016309B2 (en) 2007-11-21 2018-07-10 Smith & Nephew Plc Wound dressing
US11364151B2 (en) 2007-11-21 2022-06-21 Smith & Nephew Plc Wound dressing
US10231875B2 (en) 2007-11-21 2019-03-19 Smith & Nephew Plc Wound dressing
US11351064B2 (en) 2007-11-21 2022-06-07 Smith & Nephew Plc Wound dressing
US11179276B2 (en) 2007-11-21 2021-11-23 Smith & Nephew Plc Wound dressing
US10555839B2 (en) 2007-11-21 2020-02-11 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
US11534540B2 (en) 2010-09-20 2022-12-27 Smith & Nephew Plc Pressure control apparatus
US11027051B2 (en) 2010-09-20 2021-06-08 Smith & Nephew Plc Pressure control apparatus
US11623039B2 (en) 2010-09-20 2023-04-11 Smith & Nephew Plc Systems and methods for controlling operation of a reduced pressure therapy system
US10307517B2 (en) 2010-09-20 2019-06-04 Smith & Nephew Plc Systems and methods for controlling operation of a reduced pressure therapy system
US10143783B2 (en) 2011-11-02 2018-12-04 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
US11253639B2 (en) 2011-11-02 2022-02-22 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
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
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
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
US10702418B2 (en) 2012-05-15 2020-07-07 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10299964B2 (en) 2012-05-15 2019-05-28 Smith & Nephew Plc Negative pressure wound therapy apparatus
US10780202B2 (en) 2014-12-22 2020-09-22 Smith & Nephew Plc Noise reduction for negative pressure wound therapy apparatuses
US10973965B2 (en) 2014-12-22 2021-04-13 Smith & Nephew Plc Systems and methods of calibrating operating parameters of negative pressure wound therapy apparatuses
US11654228B2 (en) 2014-12-22 2023-05-23 Smith & Nephew Plc Status indication for negative pressure wound therapy
US10682446B2 (en) 2014-12-22 2020-06-16 Smith & Nephew Plc Dressing status detection 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
US12097095B2 (en) 2021-12-17 2024-09-24 Smith & Nephew, Inc. Method and apparatus for providing negative pressure to a negative pressure wound therapy bandage

Also Published As

Publication number Publication date
JPH11159461A (en) 1999-06-15
EP0809028A3 (en) 1999-06-02
KR970075365A (en) 1997-12-10

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