WO2014076239A1 - Élasticité étendue de membrane de pompe à force de pompage conservée - Google Patents

Élasticité étendue de membrane de pompe à force de pompage conservée Download PDF

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Publication number
WO2014076239A1
WO2014076239A1 PCT/EP2013/073949 EP2013073949W WO2014076239A1 WO 2014076239 A1 WO2014076239 A1 WO 2014076239A1 EP 2013073949 W EP2013073949 W EP 2013073949W WO 2014076239 A1 WO2014076239 A1 WO 2014076239A1
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WO
WIPO (PCT)
Prior art keywords
pump
membrane element
area
membrane
central section
Prior art date
Application number
PCT/EP2013/073949
Other languages
English (en)
Inventor
Johan Werner
Joakim Gabrielsson
Original Assignee
Mindray Medical Sweden Ab
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 Mindray Medical Sweden Ab filed Critical Mindray Medical Sweden Ab
Priority to CN201380059817.XA priority Critical patent/CN104995407B/zh
Publication of WO2014076239A1 publication Critical patent/WO2014076239A1/fr

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
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • 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

  • TITLE Extended elasticity of pump membrane with conserved pump force
  • This invention pertains in general to the field of membrane pumps or diaphragm pumps. More particularly the invention relates to membrane pumps used as sampling pumps in devices for patient monitoring, breath monitoring, anaesthesia monitoring, especially for medical ventilation monitoring and gas analyzers for monitoring gas composition in patient's breathing.
  • the membrane pumps have the advantages of simple, compact and good sealing. Membrane pumps have therefore been widely used in medical instrumentations and
  • the gas measurement module analyses gases extracted from patient breathing circuits by a membrane pump. This may be done for real time monitoring of gas composition in patient's breathing circuits and to get patient's status.
  • the gas analysis module tends to be smaller with increased reliability and low power exhaust. Hence there are higher requirements for the design of membrane pumps concerning size, life and energy loss.
  • Gas monitoring instruments such as sensors, used to detect gases are precision components sensitive to
  • the sampling pump is a main vibration source in a monitoring module. Thus may introduce noise which could affect the measurement accuracy.
  • the sampling pump is therefore required to provide a more stable sample flow.
  • membrane pump has a flat membrane and a pump chamber which is either spherically concave or cylindrical with a flat bottom.
  • Two examples of there types of pumps are Thomas membrane pump or Xavitech membrane pump.
  • membrane pumps have normally membranes that are fixed to outer edges of the membrane, thus
  • a new improved design of a membrane pump would be advantageous. Especially a smaller pump with a higher pressure having low vibrations and that runs quieter than known membrane pumps .
  • embodiments of the present disclosure preferably seek to mitigate, alleviate or eliminate one or more deficiencies, disadvantages or issues in the art, such as the above-identified, singly or in any combination by providing a device or method according to the appended patent claims for providing extended elasticity of pump membrane with conserved pump force, such as in devices for patient monitoring, breath monitoring, anaesthesia
  • a pump comprising a pump housing member, a membrane element and a second pump housing member.
  • the pump housing member is having a chamber with walls and an open end having a first area.
  • the pump housing member comprises an enlarged surface surrounding the open end of the chamber.
  • the membrane element has a second area.
  • the membrane element has a first central section having a third area with same size as the first area of the open end of the chamber.
  • the membrane element is arranged on the pump housing with the first central section positioned over the open end, forming a sealed chamber.
  • a portion of the membrane element is slidably clamped between the enlarged surface and the second pump house member in such a way that the clamped portion is allowed to move radially and to stretch when a force is applied.
  • the advantages with this configuration are that by holding a membrane element slidably fixed at a larger diameter than the actual working diameter (area) is that the membrane is free to move radial and stretch.
  • the larger area makes it possible for the membrane to stretch more, hence a longer pump stroke may be achieved (i.e. more volume can be pumped per stroke) .
  • the same pump volume can be maintained with less stretching which will increase the membranes fatigue life dramatically, i.e. a longer life of the membrane due to lower fatigue stress levels.
  • the membrane's elastic resistance will consume less of the available force so a more effective use of the available pump force may be provided .
  • the first central section and the chamber may both have circular shapes.
  • the walls be bevelled inner walls.
  • the bevelled inner walls may be straight, or
  • concave, or convex or have two or more radii, or have a sinoidal shape, or be of shaped as a polynomial of higher order .
  • the third area of the first central section of the membrane element may be an effective pump area.
  • the enlarged surface of the pump housing member may have an area with at least the same size as the membrane element.
  • the enlarged surface may comprises a groove to fit the protruding brim of the membrane member. This may be used to fix the membrane element to the pump housing member .
  • the membrane element a second central section with a fourth area.
  • the second central section may be a central portion of the membrane element.
  • the second central section is thicker than the rest of the membrane element.
  • the rest of the membrane may be
  • the fourth area of the second central section is smaller than the first area of the open end of the chamber .
  • the second central section may have a circular shape.
  • the membrane may be made of an elastic material.
  • the material may be rubber and/or is selected from a list including: Chloroprene, EPDM, FKM/FPM, Silicon, TPE or nitrile.
  • the thickness ratio between the second central section to the rest of the membrane element be between 2 to 15.
  • a ratio between the second area of the membrane element to the third area of the first central section between 1.5 to 10.
  • the second central section bevelled outer walls with a base larger than a top section, such as a truncated cone.
  • the second pump housing member have an edge which is conical or has one or more radii positioned towards the open end.
  • a method for extended elasticity of pump membrane is
  • the method comprising the step of providing a pump as herein described. Applying a reciprocating stroke motion to the first centre section of the membrane element whereby a portion of the membrane element is slidably clamped between the enlarged surface of the pump housing member and the second pump housing member so that the clamped portion is free to move radially and to stretch.
  • Fig. 1 is illustrating a cross-sectional schematic overview of an example of a pump house and a membrane.
  • Fig. 2 is illustrating a cross-sectional schematic overview of an example of a pump house and a membrane.
  • Fig. 3 is illustrating a cross-sectional schematic overview of a membrane pump.
  • the membrane pump is to be used as a sampling pump in devices for patient monitoring, breath monitoring, anaesthesia monitoring, especially medical ventilation monitoring and gas analyzers for monitoring gas composition in patient's breathing.
  • the membrane pump is not limited to this application but may be applied to many other systems where a fluid pump is required.
  • Fig. 1 illustrates a membrane pump 100, with an example of a pump housing element 1 and a membrane element 6.
  • the pump housing element has a chamber 21 with an open end having a first area.
  • the membrane element 6 is
  • the chamber 21 has bevelled or chamfered walls 20.
  • the bevelled or chamfered walls 20 may be straight, such as in the shape of a truncated cone, illustrated in Fig 1.
  • the bevelled or chamfered walls 20 may be convex or concave.
  • the walls 20 have more than one radii.
  • the walls 20 may have a sinoidal shape, a wave shape, a polynomial shape or spline shaped.
  • the chamber 21 is preferably circular but may have any shape such as, a square, rectangular, a polygon or an ellipsoid.
  • the bottom area of the chamber 21 has an area 26 which is smaller than the area 25 of the open end.
  • the membrane element 6 has a second area 27 and a first central section having a third area 28 (see Fig. 2) .
  • the first central section is a central portion of the membrane element.
  • the third area is smaller than the second area 27.
  • the membrane element has preferably a circular shape but may have any shape, such as a square, rectangular, a polygon or an ellipsoid. Additionally, the first central section has preferably a circular shape but may have any shape, such as a square, rectangular, a polygon or an ellipsoid .
  • the shape of the membrane element and first central section does not need to be the same, for example, the membrane element may be a square while the first central section has is circularly shaped.
  • the first central section has the same shape as the open end of the chamber .
  • the membrane element is preferably made of a flexible or elastic material, such as rubber.
  • a flexible or elastic material such as rubber.
  • materials that may be used are Chloroprene, EPDM, FKM/FPM, Silicon, TPE or nitrile. But other materials with similar properties known by the skilled person may be used.
  • the membrane element may include a second central section having a fourth area 24.
  • the second central section has a thickness 23 which is larger than the thickness 22 of the rest of the membrane element.
  • the rest of the membrane may be defined as a periphery section surrounding the second central section Preferably the ratio between the thicknesses 23 of the second central section to the thickness 22 of the rest of the membrane element may be between 2 to 15.
  • the thicker second central section may preferably be shaped to protruding in an opposite direction from the open end of the chamber.
  • the walls of the protruding part are bevelled or chamfered, such as a truncated cone or convex or concave.
  • the protruding part may be shaped as a segment of a circle or a half circle .
  • the thicker second central section of the membrane element may preferably have a smaller area than the opening. Also the thicker second central section of the membrane element may be centrally positioned over the open end of the chamber 21.
  • the thickness of the second central section provides for a stiffer central part of the membrane element 6 at a location where a reciprocating pump stroke motion from an actuator, such as a voice coil, a minimotor, a piston, a cam or any other mechanical device that could be used to expose the membrane element 6 to a force, is applied.
  • an actuator such as a voice coil, a minimotor, a piston, a cam or any other mechanical device that could be used to expose the membrane element 6 to a force.
  • P F/A (l) where, P is the pump pressure, F is the force of the stroke and A is the effective pump area.
  • the shape and the thickness 23 of the thicker section can be varied. The same applies to the design of the inner walls 20 of chamber.
  • the membrane element is a membrane element
  • This brim 30 may be positioned at the periphery edge of the membrane element 6.
  • the pump housing 1 may have an enlarged surface surrounding the open end of the chamber 21. This enlarged surface may comprise a groove 31 to fit the protruding brim
  • the enlarged surface may have an area at least the same as the area of the membrane element 6.
  • Fig. 2 illustrates further example of a membrane pump 200.
  • the membrane pump 200 has a pump housing member 1 and a membrane element 32.
  • the pump housing member 1 and membrane element 32 may be configured in accordance with the description to Fig. 1.
  • the pump housing 1 and could have a chamber 21 which either has a spherical or a flat bottom surface.
  • the total area 27 of the membrane element 32 is an elastic membrane area 27 and the part of the membrane element 32 covering the open end of the chamber 21 is the effective pump area 28 (i.e. same as the area 25 of the open end) . Additionally, in some examples, when the
  • membrane element 32 has a centrally positioned second central section having a thickness 23 larger than a thickness 22 rest of the membrane element (see Fig 1), the effective pump area (i.e. the first central section) 28 is larger than the area 24 of the second central section.
  • a major difference between the design illustrated in Fig. 2 and prior art is that the membrane element 32 is not fixed at the edge of the chamber 21. Instead a portion of the membrane element 32 is slidably clamped between an enlarged surface of the pump housing 1 and a second member 5 of the pump housing 1.
  • the second member 5 of the pump housing 1 may be a membrane fixing plate. In the area between the second member 5 of the pump housing 1 and the enlarged surface of the pump housing 1, the membrane element 32 is free to move radial and to stretch when a force is applied.
  • the membrane element 32 may be fixed at an outer diameter, for example, by a protruding brim 30 fitted into a groove 31 at the enlarged surface of the pump housing 1. In the area between the fixing point and the pump chamber 21 the membrane element 32 is in this configuration still able to freely move radially and stretch.
  • the slidebly clamped portion of the membrane element 32 is located between the membrane fixing point (i.e. an outer edge) and the chamber 21.
  • the same pump volume can be maintained with less stretching which may increase the membrane fatigue life due to less fatigue stress levels.
  • the elastic resistance of the membrane element 32 may consume less of the available pumping force when comparing a pump of a design illustrated in Fig 2 with a prior art pump, both having same pump chamber size. The same effect would also be achieved if a flat membrane element would have been used instead of a membrane element with a thicker midsection as illustrated in the figures.
  • the material of the pump housing 1 and the second pump housing member 5 should have low friction and be stiff. Some examples of materials are polymer, metal or composite materials.
  • a problem with having a flat membrane surface meeting a concave spherical surface or a flat surface is that the meeting between these two will generate noise and the pump stroke movement will stop instantly causing mechanical vibrations.
  • the shape of the pump chamber 21 to have wall being conical or with one or more radii positioned in the area where the membrane element 32 becomes stiffer (thicker) it is possible to decelerate the pump stroke in a progressive way. This will make the stops, when the membrane element is in its end positions silent and also reduces the mechanical vibrations due to the progressive motion deceleration.
  • the edge of the the second pump housing member 5 i.e. membrane fixing plate
  • the edge of the second pump housing member 5 i.e. membrane fixing plate
  • the shape of the cavity and membrane fixing plate wall may be designed in many
  • a preferred ratio between the area 27 of the elastic membrane element to the effective pump area 28, defined by the previous equation 1, is between 1.5 to 10. The longer a stroke is the larger the difference between the two areas has to be.
  • Fig. 3 illustrates a cross-sectional view of an example of a membrane pump 300.
  • the membrane pump 300 comprises a membrane element 33 (according to any of the herein disclosed configurations) and a pump housing 1, and optional second housing member 5 (e.g. membrane fixing plate) and a pump chamber 21.
  • the pump chamber 21 has bevelled walls to abutting the area where the membrane element 33 becomes thicker. Hence decelerate the pump stroke in a progressive way.
  • the pump further comprises a pump head 12. In this example, the pump head 12 is abutting the second central section of the membrane element 33.
  • the pump head may be mechanically attached to the top of second central section, such as inserted into the second central section or a screw could be used to screw secure them together.
  • an adhesive may be used between the top of the second central section and the abutting area of the pump head 12 to affix the two members. Examples of adhesives may be, glue, sticky tape, etc.
  • the actuator exerting a force on the membrane element 33 is a voice coil.
  • the voice coil is used to transmit a reciprocating stroke motions by the pump head 12 to the membrane element 33.
  • the voice coil may be a cylindrical voice coil .
  • the coil 13 is a circular cylinder structure, which is fixed on the pump head 12 and placed in an air gap.
  • the air gap is enclosed by a magnetic cup with conical bottom 7, a conical magnet 8, such as a permanent magnet, and a one side conical pole shoe 9.
  • the coil 13 may be a skeletonless coil, entwined by self-adhesive lining. This design may take advantage of the limit space of the air gap, hence it's possible to design smaller membrane pumps 300.
  • the magnet cup with a conical bottom 7 is positioned as an inverted M- shape .
  • the contact surface between the conical pole shoe 9, the conical magnet 8 and the contact surface between the conical magnet and conical bottom of the magnet cup 7 are all tapered.
  • the tapered surfaces are tapered in the same direction. Such structure increases the side area of the conical pole shoe 9, making the magnetic field in the air gap distribute evenly radially.
  • the conical shape provides better support for the free shaft of the pump head 12 without adding any volume outside of the cylinder volume.
  • the magnetic field is as large as possible when the coil 13 works in the air gap.
  • the working principle of the membrane pump 300 is: the coil 13 positioned in the magnetic field formed by the one side conical pole shoe 9, the conical magnet 8 and the magnet cup with conical bottom 7.
  • the coil 13 will produce an alternating ampere force to drive the pump head 12 in reciprocating linear motion.
  • the pump cycle will produce a cycle of positive and negative pressure in the pump chamber 21.
  • pressure in the sealed room is negative, fluid will move through a pump inlet into the chamber 21.
  • pressure in the sealed room is positive, the pump 300 will move fluid out through an outlet .
  • a small voice coil is adopted to drive membrane to do linear motion so that large transmission mechanisms are eliminated.
  • the voice coil does not affect the working life of the pump 300, because the voice coil does not comprise structures that are easily worn out.
  • the voice coil drives the membrane element 33 directly without the process of transforming motion to another; hence no intermediate energy is consumed. Further, there is no starting torque problem; hence the pump 300 may start almost instantly by applying a small voltage.
  • the voice coil therefore also output a force or a displacement of the pump head 12 to collect a small volume of fluid even at small driving voltage or current.
  • the reciprocating motion of the pump head 12 is controlled by controlling the frequency of the voltage. Because the magnitude of reciprocating motion is dependent to the amplitude of the current, the collected flow size may be easily controlled by adjusting the amplitude of the voltage to the voice coil.

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

Abstract

La présente invention se rapporte à une pompe comprenant un élément logement (1) de pompe possédant une chambre (21) dotée de parois intérieures et d'une extrémité ouverte ayant une première superficie (25), l'élément logement (1) de pompe comprenant une surface agrandie entourant l'extrémité ouverte de la chambre (21). La pompe comprend en outre un deuxième élément logement (5) de pompe et un élément membrane (32) ayant une deuxième superficie (27). L'élément membrane (32) comporte une première section centrale ayant une troisième superficie (28) de la même taille que la première superficie (25) de l'extrémité ouverte de la chambre (21). L'élément membrane (32) est agencé sur l'élément logement (1) de pompe, la première section centrale étant positionnée par-dessus l'extrémité ouverte, formant une chambre hermétiquement fermée. Une partie de l'élément membrane (32) est serrée coulissante entre la surface agrandie et le second élément logement (5) de pompe.
PCT/EP2013/073949 2012-11-15 2013-11-15 Élasticité étendue de membrane de pompe à force de pompage conservée WO2014076239A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201380059817.XA CN104995407B (zh) 2012-11-15 2013-11-15 泵及用于泵膜的扩张弹性的方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201261726965P 2012-11-15 2012-11-15
EP12192859 2012-11-15
US61/726,965 2012-11-15
EP12192859.2 2012-11-15

Publications (1)

Publication Number Publication Date
WO2014076239A1 true WO2014076239A1 (fr) 2014-05-22

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PCT/EP2013/073949 WO2014076239A1 (fr) 2012-11-15 2013-11-15 Élasticité étendue de membrane de pompe à force de pompage conservée

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EP (1) EP2733355B1 (fr)
CN (1) CN104995407B (fr)
WO (1) WO2014076239A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105971861A (zh) * 2016-06-29 2016-09-28 湖州安瑞能液压气动科技有限公司 膜片式汽车用电动真空泵的运行机构
CN105952625A (zh) * 2016-06-29 2016-09-21 湖州安瑞能液压气动科技有限公司 膜片式汽车用电动真空泵的泵体膜片止口机构
WO2019019154A1 (fr) * 2017-07-28 2019-01-31 深圳市大疆创新科技有限公司 Pompe à membrane
DE102019128680A1 (de) * 2019-10-23 2021-04-29 Qonqave Gmbh Pumpe mit einer Fördervorrichtung zumindest zu einem Fördern eines Fluids und derartige Fördervorrichtung
DE102019128679A1 (de) * 2019-10-23 2021-04-29 Qonqave Gmbh Fördervorrichtung zumindest zu einem Fördern eines Fluids und Pumpe mit einer derartigen Fördervorrichtung
DE102019128678A1 (de) * 2019-10-23 2021-04-29 Qonqave Gmbh Fördervorrichtung zumindest zu einem Fördern eines Fluids und Pumpe mit einer derartigen Fördervorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416461A (en) * 1966-09-01 1968-12-17 Hills Mccanna Co Diaphragm pump
US4785719A (en) * 1980-05-16 1988-11-22 J. Wagner Gmbh Diaphragm for high pressure pumps, compressors or the like
EP1950416A1 (fr) * 2005-10-25 2008-07-30 Nitto Kohki Co., Ltd. Pompe a faibles vibrations
DE102010009670A1 (de) * 2010-02-27 2011-09-01 Knf Neuberger Gmbh Membranpumpe
DE102011003461A1 (de) * 2011-02-01 2012-08-02 Robert Bosch Gmbh Membranpumpe sowie Abgasnachbehandlungssystem mit einer Membranpumpe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007005019A1 (de) * 2006-05-18 2007-12-06 Continental Teves Ag & Co. Ohg Membranpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416461A (en) * 1966-09-01 1968-12-17 Hills Mccanna Co Diaphragm pump
US4785719A (en) * 1980-05-16 1988-11-22 J. Wagner Gmbh Diaphragm for high pressure pumps, compressors or the like
EP1950416A1 (fr) * 2005-10-25 2008-07-30 Nitto Kohki Co., Ltd. Pompe a faibles vibrations
DE102010009670A1 (de) * 2010-02-27 2011-09-01 Knf Neuberger Gmbh Membranpumpe
DE102011003461A1 (de) * 2011-02-01 2012-08-02 Robert Bosch Gmbh Membranpumpe sowie Abgasnachbehandlungssystem mit einer Membranpumpe

Also Published As

Publication number Publication date
CN104995407B (zh) 2017-05-03
EP2733355B1 (fr) 2019-05-08
EP2733355A1 (fr) 2014-05-21
CN104995407A (zh) 2015-10-21

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