EP1525399B1 - Diaphragm pump - Google Patents
Diaphragm pump Download PDFInfo
- Publication number
- EP1525399B1 EP1525399B1 EP04714736A EP04714736A EP1525399B1 EP 1525399 B1 EP1525399 B1 EP 1525399B1 EP 04714736 A EP04714736 A EP 04714736A EP 04714736 A EP04714736 A EP 04714736A EP 1525399 B1 EP1525399 B1 EP 1525399B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- diaphragm
- support ribs
- chamber wall
- diaphragm pump
- pumping chamber
- 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.)
- Expired - Lifetime
Links
- 238000005086 pumping Methods 0.000 claims description 23
- 230000033001 locomotion Effects 0.000 claims description 12
- 239000012528 membrane Substances 0.000 description 36
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Images
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
- the invention relates to a diaphragm pump with an oscillating during the pumping movements between a lower and a top dead center working diaphragm, which defines a pump space between itself and a preferably concavely curved pump chamber wall, wherein the working diaphragm rests at top dead center on the pump chamber wall.
- Diaphragm pumps of the type mentioned are already known in various designs. If such diaphragm pumps are operated in the lower vacuum range, there is the danger that the working diaphragm will bulge due to the differential pressure load occurring between the upper and lower diaphragm sides and in this way reduce the pumping chamber volume. Especially in this deeper vacuum range, large pressure differences occur between the membrane top and bottom. While the membrane underside generally bears the atmospheric pressure, the respective evacuation pressure acts on the upper side of the membrane, the maximum pressure difference resulting from the atmospheric pressure minus the end pressure of the diaphragm pump.
- a membrane pump with a working diaphragm made of elastic material which has a receiving cavity for a connecting rod in its reinforced central area and is held on the outside with a clamping edge on the pump housing.
- a plurality of radially spaced-apart and circumferential circumferential ribs are provided radially outwardly adjacent to the reinforced central region of the diaphragm, by which a higher strength of the diaphragm against pressure while retaining the flexibility of the central region bounding outer ring zone of the membrane is desired.
- the diaphragm pump according to the invention has a working diaphragm which has an inner and an outer annular zone, wherein between these annular zones a stiffened and during the pumping movements non-deformable membrane region is arranged. While the inner and outer annular zones form two hinge regions which allow the working diaphragm to bend in these regions due to the stroke, the undeformable diaphragm region in between counteracts undesirable and performance-reducing bulging of the working diaphragm under increased differential pressure loads.
- the stiffening of the membrane is carried out in its non-deformable membrane area such that the working membrane still rests unhindered at the top dead center on the preferably concavely curved pump chamber wall.
- the working membrane is stiffened according to the invention in its non-deformable membrane region by means of radially oriented and circumferentially spaced support ribs, which are arranged on the side facing away from the pump chamber wall diaphragm bottom. Since the working diaphragm of the diaphragm pump according to the invention has reinforcing ribs stiffening on its underside facing away from the pump chamber wall, it can be formed in its non-deformable membrane region from a single-layer material layer.
- the support or reinforcing ribs are geometric and dimensionally designed so that, for example, even at low end pressures the atmospheric pressure prevailing during the intake stroke on the membrane underside can not bend the membrane in its non-deformable membrane area.
- the support ribs stiffening this membrane area are delimited on both sides by the deformable annular zones which form the hinge areas required for the flexing movements of the membrane during the pumping movements.
- the support ribs can be arranged in the radial direction on the membrane underside.
- the greater the angle of the support ribs to the radial the less the radial deformation of the support ribs and the deformation of the compression space associated with an increase in the harmful space and with a reduction in the final vacuum facing contour of the ribs.
- a development according to the invention provides that the support ribs have a curved longitudinal extension and are thus arranged practically helically on the diaphragm underside.
- the ribs have a straight longitudinal extent, it can be advantageous if the support ribs preferably deviate up to ⁇ 30 ° from the radial.
- circumferentially spaced support ribs have the same direction of curvature or deviation from the radial.
- a diaphragm pump 1 is shown in the region of its pump head 2.
- the membrane pump 1 has a working diaphragm 3, which is clamped at its peripheral edge in the pump head.
- a central fixing core 4 is formed, which is connected to the connecting rod 5 of a crank drive, not shown here.
- the pumping movements between the in Fig. 1 shown top dead center and the in Fig. 2 shown bottom dead center oscillating working diaphragm 3 defines between itself and a concave pump chamber wall 6 a pump space. 7
- the working diaphragm pump 1 shown here for example as a backing pump of a turbomolecular pump
- the working diaphragm 3 does not buckle under the differential pressure load which occurs between the upper and lower diaphragm sides and thereby decisively reduces the pumping chamber volume
- the working diaphragm 3 has a stiffened annular zone which is substantially non-deformable during the pumping movements.
- This non-deformable membrane area is bounded by an inner annular zone 8 and an outer annular zone 9, which serve as deformable hinge areas during the pumping motions.
- radially oriented support ribs 10 are provided here, which are arranged on the pump chamber wall 6 facing away from the membrane bottom. These support ribs 10 are circumferentially spaced at regular intervals from each other. So that the working diaphragm 3 - like Fig. 1 shows - at the top dead center of the pump chamber wall 6 can preferably invest over the entire surface, the pump room wall 6 facing side of the support ribs 10 is adapted to the contour of the pump chamber wall 6.
- the support ribs 10 may have a straight longitudinal extent. In order to favor the stiffening of the working membrane 3 in the non-deformable annular zone, it may be advantageous if the support ribs 10 preferably deviate up to ⁇ 30 ° from the radial. It is also possible that the support ribs - as in Fig. 4 is shown - have a curved longitudinal extent and are arranged practically helically on the diaphragm underside.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Description
Die Erfindung betrifft eine Membranpumpe mit einer während der Pumpbewegungen zwischen einem unteren und einem oberen Totpunkt oszillierenden Arbeitsmembrane, die zwischen sich und einer vorzugsweise konkav gewölbten Pumpraumwand einen Pumpraum begrenzt, wobei die Arbeitsmembrane im oberen Totpunkt an der Pumpraumwand anliegt.The invention relates to a diaphragm pump with an oscillating during the pumping movements between a lower and a top dead center working diaphragm, which defines a pump space between itself and a preferably concavely curved pump chamber wall, wherein the working diaphragm rests at top dead center on the pump chamber wall.
Membranpumpen der eingangs erwähnten Art sind bereits in verschiedenen Ausführungen bekannt. Werden solche Membranpumpen im tieferen Vakuumbereich betrieben, besteht die Gefahr, dass die Arbeitsmembrane aufgrund der zwischen Membranober- und - unterseite auftretenden Differenzdruckbelastung ausbeult und auf diese Weise das Schöpfraumvolumen verkleinert. Gerade in diesem tieferen Vakuumbereich treten große Druckdifferenzen zwischen Membranober- und -unterseite auf. Während auf die Membranunterseite in der Regel der atmosphärische Druck lastet, wirkt auf die Membranoberseite der jeweilige Evakuierungsdruck ein, wobei sich die maximale Druckdifferenz aus atmosphärischem Druck minus Enddruck der Membranpumpe ergibt.Diaphragm pumps of the type mentioned are already known in various designs. If such diaphragm pumps are operated in the lower vacuum range, there is the danger that the working diaphragm will bulge due to the differential pressure load occurring between the upper and lower diaphragm sides and in this way reduce the pumping chamber volume. Especially in this deeper vacuum range, large pressure differences occur between the membrane top and bottom. While the membrane underside generally bears the atmospheric pressure, the respective evacuation pressure acts on the upper side of the membrane, the maximum pressure difference resulting from the atmospheric pressure minus the end pressure of the diaphragm pump.
Bei den üblichen Membranen herkömmlicher Membranpumpen, insbesondere wenn diese Membranpumpen im Bereich des Enddruckes arbeiten und auf den Membranen große Druckdifferenzen lasten, ist festzustellen, dass die seitliche elastische Zone der flexiblen Membrane durch den atmosphärischen Druck in Richtung zum Förderraum ausgebeult wird. Dieses "Ausbeulen" der Membrane führt dazu, dass das Schöpfraumvolumen entscheidend verkleinert wird, was sich negativ auf das Saugvermögen der Membranpumpen auswirkt.In the conventional membranes of conventional diaphragm pumps, in particular when these diaphragm pumps operate in the region of the final pressure and load large pressure differences on the diaphragms, it can be seen that the lateral elastic zone of the flexible diaphragm is bulged by the atmospheric pressure in the direction of the delivery chamber. This "bulging" of the membrane leads to the fact that the pump chamber volume is significantly reduced, which has a negative effect on the pumping speed of the diaphragm pump.
Besonders ausgeprägt ist diese Formveränderung bei zwei- und mehrstufigen Membranpumpen mit tiefen Enddrücken. Bei diesen Pumpen ist die tiefere Vakuumstufe am stärksten betroffen, da hier die größten Druckdifferenzen auftreten.This change in shape is particularly pronounced in the case of two-stage and multi-stage diaphragm pumps with low end pressures. In these pumps, the lower vacuum level is the hardest hit, as the greatest pressure differences occur here.
Aus der
Mit Hilfe der an der Membranoberseite der vorbekannten Membrane vorgesehenen Rippen wird zwar einer Rissbildung an der Membranoberseite entgegengewirkt -, ein Ausbeulen der Membrane in ihrer zwischen Einspannrand und Zentralbereich vorgesehenen flexiblen Ringzone lässt sich jedoch mit den in Umfangsrichtung orientierten Rippen keinesfalls vermeiden.Although with the help of the provided on the membrane top of the prior art membrane ribs on the membrane top is counteracted - a bulging of the membrane in its provided between clamping edge and central region flexible annular zone can be avoided with the oriented in the circumferential direction ribs under any circumstances.
Es besteht daher insbesondere die Aufgabe, eine Membranpumpe der eingangs erwähnten Art zu schaffen, die auch bei zwischen Membranober- und -Unterseite auftretenden erhöhten Differenzdruckbelastungen weder zu einer Vergrößerung des Totraumvolumens noch zu einer Verkleinerung des Schöpfraumvolumens neigt.It is therefore the object, in particular, to provide a diaphragm pump of the type mentioned at the outset, which does not increase the dead space volume even when elevated differential pressure loads occur between the upper and lower diaphragm sides still tends to a reduction of the creator space volume.
Die erfindungsgemäße Lösung dieser Aufgabe besteht bei der Membranpumpe der eingangs erwähnten Art insbesondere in den Merkmalen des geltenden Patentanspruchs 1.The inventive solution to this problem is in the diaphragm pump of the type mentioned in particular in the features of the current patent claim. 1
Die erfindungsgemäße Membranpumpe hat eine Arbeitsmembrane, die eine innere und eine äußere Ringzone aufweist, wobei zwischen diesen Ringzonen ein ausgesteifter und während der Pumpbewegungen unverformbarer Membranbereich angeordnet ist. Während die innere und die äußere Ringzone zwei Scharnierbereiche bilden, die das durch den Hub erforderliche Knicken der Arbeitsmembrane in diesen Bereichen erlauben, wirkt der dazwischenliegende unverformbare Membranbereich einem unerwünschten und leistungsmindernden Ausbeulen der Arbeitsmembrane bei erhöhten Differenzdruckbelastungen entgegen. Dabei erfolgt die Aussteifung der Membrane in ihrem unverformbaren Membranbereich derart, dass die Arbeitsmembrane im oberen Totpunkt dennoch ungehindert an der vorzugsweise konkav gewölbten Pumpraumwand anliegt.The diaphragm pump according to the invention has a working diaphragm which has an inner and an outer annular zone, wherein between these annular zones a stiffened and during the pumping movements non-deformable membrane region is arranged. While the inner and outer annular zones form two hinge regions which allow the working diaphragm to bend in these regions due to the stroke, the undeformable diaphragm region in between counteracts undesirable and performance-reducing bulging of the working diaphragm under increased differential pressure loads. In this case, the stiffening of the membrane is carried out in its non-deformable membrane area such that the working membrane still rests unhindered at the top dead center on the preferably concavely curved pump chamber wall.
Die Arbeitsmembrane ist in ihrem unverformbaren Membranbereich erfindungsgemäß mittels radial orientierter und in Umfangsrichtung voneinander beabstandeter Stützrippen ausgesteift, die auf der der Pumpraumwand abgewandten Membranunterseite angeordnet sind. Da die Arbeitsmembrane der erfindungsgemäßen Membranpumpe an ihrer der Pumpraumwand abgewandten Membranunterseite derart aussteifende Stützrippen hat, kann diese in ihrem unverformbaren Membranbereich aus einer einschichtigen Materiallage gebildet sein. Dabei sind die Stütz- oder Verstärkungsrippen geometrisch und maßlich so ausgestaltet, dass beispielsweise auch bei tiefen Enddrücken der während des Ansaughubs auf der Membranunterseite herrschende Atmosphärendruck die Membrane in ihrem unverformbaren Membranbereich nicht durchbiegen können. Die diesen Membranbereich aussteifenden Stützrippen werden beidseits durch die verformbaren Ringzonen begrenzt, welche die für die Walkbewegungen der Membrane während der Pumpbewegungen erforderlichen Scharnierbereiche bilden.The working membrane is stiffened according to the invention in its non-deformable membrane region by means of radially oriented and circumferentially spaced support ribs, which are arranged on the side facing away from the pump chamber wall diaphragm bottom. Since the working diaphragm of the diaphragm pump according to the invention has reinforcing ribs stiffening on its underside facing away from the pump chamber wall, it can be formed in its non-deformable membrane region from a single-layer material layer. The support or reinforcing ribs are geometric and dimensionally designed so that, for example, even at low end pressures the atmospheric pressure prevailing during the intake stroke on the membrane underside can not bend the membrane in its non-deformable membrane area. The support ribs stiffening this membrane area are delimited on both sides by the deformable annular zones which form the hinge areas required for the flexing movements of the membrane during the pumping movements.
Die Stützrippen können in radialer Richtung an der Membranunterseite angeordnet sein. Je größer jedoch der Winkel der Stützrippen zur Radialen ist, desto geringer ist die radiale Verformung der Stützrippen und die mit einer Vergrößerung des schädlichen Raums sowie mit einer Verminderung des Endvakuums verbundene Deformation der dem Verdichtungsraum zugewandten Kontur der Rippen. Dabei sieht eine Weiterbildung gemäß der Erfindung vor, dass die Stützrippen eine gekrümmte Längserstreckung aufweisen und somit praktisch spiralförmig an der Membranunterseite angeordnet sind.The support ribs can be arranged in the radial direction on the membrane underside. However, the greater the angle of the support ribs to the radial, the less the radial deformation of the support ribs and the deformation of the compression space associated with an increase in the harmful space and with a reduction in the final vacuum facing contour of the ribs. In this case, a development according to the invention provides that the support ribs have a curved longitudinal extension and are thus arranged practically helically on the diaphragm underside.
Weisen die Rippen demgegenüber eine gerade Längserstreckung auf, kann es vorteilhaft sein, wenn die Stützrippen vorzugsweise bis zu ± 30° von der Radialen abweichen.If, on the other hand, the ribs have a straight longitudinal extent, it can be advantageous if the support ribs preferably deviate up to ± 30 ° from the radial.
Dabei ist es zweckmäßig, wenn die in Umfangsrichtung voneinander beabstandeten Stützrippen dieselbe Krümmungsrichtung oder Abweichung von der Radialen haben.It is expedient if the circumferentially spaced support ribs have the same direction of curvature or deviation from the radial.
Damit sich insbesondere auch eine in ihrem unverformbaren Membranbereich gleichmäßig dicke Arbeitsmembrane im oberen Totpunkt gut an die vorzugsweise konkav gewölbte Pumpraumwand anlegen kann, ist es vorteilhaft, wenn die der Pumpraumwand zugewandte Seite der Stützrippen an die Kontur der Pumpraumwandform angepasst ist.Thus, even in their non-deformable membrane area uniformly thick working membrane at top dead center can invest well on the preferably concave pump chamber wall, it is advantageous if the pump room wall facing side of the support ribs is adapted to the contour of the pump space wall shape.
Weitere Merkmale der Erfindung ergeben sich aus der folgenden Beschreibung erfindungsgemäßer Ausführungsbeispiele in Verbindung mit den Ansprüchen sowie der Zeichnung. Die einzelnen Merkmale können je für sich oder zu mehreren bei einer Ausführungsform gemäß der Erfindung verwirklicht sein.Further features of the invention will become apparent from the following description of inventive embodiments in conjunction with the claims and the drawings. The individual features may be implemented individually or in combination in an embodiment according to the invention.
Es zeigt in schematischer Darstellung:
- Fig. 1
- die Arbeitsmembrane einer Membranpumpe im oberen Totpunkt ihrer Pumpbewegungen, wobei die Arbeitsmembrane zwei als verformbare Scharnierbereiche wirkende Ringzonen hat, zwischen denen ein mittels Stützrippen ausgesteifter unverformbarer Membranbereich angeordnet ist,
- Fig. 2
- die Arbeitsmembrane aus
Fig. 1 im unteren Totpunkt ihrer Pumpbewegungen, - Fig. 3
- die Membranunterseite einer mit
Fig. 1 vergleichbaren Arbeitsmembrane und - Fig. 4
- die Arbeitsmembrane aus den
Fig. 1 bis 3 in einer geänderten Ausführungsform.
- Fig. 1
- the working diaphragm of a diaphragm pump at top dead center of its pumping movements, wherein the working diaphragm has two annular zones acting as deformable hinge areas, between which an undeformable one stiffened by means of supporting ribs Membrane region is arranged,
- Fig. 2
- the working diaphragm off
Fig. 1 at the bottom dead center of her pumping movements, - Fig. 3
- the membrane base one with
Fig. 1 comparable working diaphragm and - Fig. 4
- the working membrane from the
Fig. 1 to 3 in a modified embodiment.
In den
Insbesondere wenn die hier dargestellte Membranpumpe 1, beispielsweise als Vorpumpe einer Turbomolekularpumpe, in tieferen Vakuumbereichen arbeitet, treten große Druckdifferenzen zwischen Membranober- und -unterseite auf. Damit nicht die Arbeitsmembrane 3 unter der zwischen Membranober- und -unterseite auftretenden Differenzdruckbelastung ausbeult und sich dadurch das Schöpfraumvolumen entscheidend verkleinert, weist die Arbeitsmembrane 3 eine ausgesteifte und während der Pumpbewegungen im wesentlichen unverformbare Ringzone auf. Dieser unverformbare Membranbereich wird durch eine innere Ringzone 8 und eine äußere Ringzone 9 begrenzt, die als verformbare Scharnierbereiche während der Pumpbewegungen dienen.In particular, when the diaphragm pump 1 shown here, for example as a backing pump of a turbomolecular pump, operates in deeper vacuum regions, large pressure differences occur between the membrane top and bottom side. So that the working
Zur Aussteifung der Membrane in ihrem unverformbaren Membranbereich sind hier radial orientierte Stützrippen 10 vorgesehen, die an der der Pumpraumwand 6 abgewandten Membranunterseite angeordnet sind. Diese Stützrippen 10 sind in Umfangsrichtung in gleichmäßigen Abständen voneinander beabstandet. Damit sich die Arbeitsmembrane 3 - wie
Wie in
Je größer der Winkel der in
Claims (7)
- Diaphragm pump (1) having a working diaphragm (3) that oscillates between a top and bottom dead centre during the pumping movements, said diaphragm delimiting a pumping chamber (7) between itself and a pumping chamber wall (6) and abutting on the pumping chamber wall (6) at top dead centre, the working diaphragm (3) having an inner and an outer annular zone (8, 9) which are deformable during the pumping movements, while between these annular zones (8, 9) is disposed a reinforced diaphragm region which is substantially non-deformable during the pumping movements, and wherein the working diaphragm (3) is reinforced in its non-deformable diaphragm region by radially oriented support ribs (10) that are spaced from one another in the circumferential direction, and which are arranged on the underside of the diaphragm remote from the pumping chamber wall (6).
- Diaphragm pump according to claim 1, characterised in that the pumping chamber wall has a concave curvature.
- Diaphragm pump according to claim 1 or 2, characterised in that the support ribs (10) have a curved longitudinal extent.
- Diaphragm pump according to claim 1 or 2, characterised in that the support ribs (10) have a straight longitudinal extent.
- Diaphragm pump according to one of claims 1 to 4, characterised in that the support ribs (10) preferably deviate from the radial by up to plus/minus 30°.
- Diaphragm pump according to one of claims 1 to 5, characterised in that the support ribs (10) which are spaced from one another in the circumferential direction have the same direction of curvature or deviation from the radial.
- Diaphragm pump according to one of claims 1 to 6, characterised in that the side of the support ribs (10) that faces the pumping chamber wall (6) is adapted in shape to fit the contour of the pumping chamber wall (6).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10312899 | 2003-03-22 | ||
| DE10312899A DE10312899A1 (en) | 2003-03-22 | 2003-03-22 | diaphragm pump |
| PCT/EP2004/001887 WO2004083639A1 (en) | 2003-03-22 | 2004-02-26 | Diaphragm pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1525399A1 EP1525399A1 (en) | 2005-04-27 |
| EP1525399B1 true EP1525399B1 (en) | 2008-06-25 |
Family
ID=32946075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04714736A Expired - Lifetime EP1525399B1 (en) | 2003-03-22 | 2004-02-26 | Diaphragm pump |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7363850B2 (en) |
| EP (1) | EP1525399B1 (en) |
| JP (1) | JP2006520868A (en) |
| DE (2) | DE10312899A1 (en) |
| WO (1) | WO2004083639A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12061487B2 (en) | 2022-06-01 | 2024-08-13 | Husqvarna | Pressure reducer |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0409446D0 (en) | 2004-04-28 | 2004-06-02 | Smith & Nephew | Apparatus |
| FR2921443A1 (en) * | 2007-09-20 | 2009-03-27 | Fresenius Vial Soc Par Actions | FINGER LINEAR PERISTALTIC PUMP AND A MEMBRANE AND A FINGER FOR SUCH A PUMP |
| WO2009066106A1 (en) | 2007-11-21 | 2009-05-28 | Smith & Nephew Plc | Wound dressing |
| GB0723855D0 (en) | 2007-12-06 | 2008-01-16 | Smith & Nephew | Apparatus and method for wound volume measurement |
| JP4792598B2 (en) | 2008-03-24 | 2011-10-12 | 株式会社日本製鋼所 | Hydrogen permeation module and method of use thereof |
| WO2011005286A1 (en) * | 2009-06-22 | 2011-01-13 | Lansinoh Laboratories, Inc. | Breast milk collection apparatus and components thereof |
| GB201015656D0 (en) | 2010-09-20 | 2010-10-27 | Smith & Nephew | Pressure control apparatus |
| 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 |
| 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 |
| US9427505B2 (en) | 2012-05-15 | 2016-08-30 | Smith & Nephew Plc | Negative pressure wound therapy apparatus |
| JP6991067B2 (en) | 2014-12-22 | 2022-01-12 | スミス アンド ネフュー ピーエルシー | Negative pressure closure therapy equipment and methods |
| DE102019135153A1 (en) * | 2019-12-19 | 2021-06-24 | Prominent Gmbh | Dosing pump with dosing diaphragm |
| DE102020126241A1 (en) | 2020-10-07 | 2022-04-07 | Alfmeier Präzision SE | DIAPHRAGM ARRANGEMENT |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3947156A (en) | 1972-03-08 | 1976-03-30 | Erich Becker | Diaphragm pump, particularly for the generation of vacuum |
| CA2131449C (en) | 1992-03-05 | 2003-10-28 | Joseph Luiz Santa | A pump, control valve and diaphragm |
| US5349896A (en) | 1993-06-14 | 1994-09-27 | W. L. Gore & Associates, Inc. | Pump diaphragm |
| DE19510828C2 (en) * | 1995-03-24 | 1998-12-24 | Knf Neuberger Gmbh | Diaphragm pump with a shaped membrane |
| DE19834468C1 (en) | 1998-07-30 | 2000-02-24 | Asf Thomas Ind Gmbh | Membrane for a membrane pump comprises a membrane body made of elastic material, which can be circumferentially tensioned, and a central rigid core |
| DE19906317C1 (en) * | 1999-02-16 | 2000-10-19 | Knf Flodos Ag Sursee | Diaphragm pump |
| DE50112760D1 (en) * | 2001-01-02 | 2007-09-06 | Medela Holding Ag | diaphragm pump |
-
2003
- 2003-03-22 DE DE10312899A patent/DE10312899A1/en not_active Withdrawn
-
2004
- 2004-02-26 EP EP04714736A patent/EP1525399B1/en not_active Expired - Lifetime
- 2004-02-26 JP JP2006504472A patent/JP2006520868A/en active Pending
- 2004-02-26 US US10/541,350 patent/US7363850B2/en active Active
- 2004-02-26 WO PCT/EP2004/001887 patent/WO2004083639A1/en active IP Right Grant
- 2004-02-26 DE DE502004007433T patent/DE502004007433D1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12061487B2 (en) | 2022-06-01 | 2024-08-13 | Husqvarna | Pressure reducer |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1525399A1 (en) | 2005-04-27 |
| JP2006520868A (en) | 2006-09-14 |
| DE502004007433D1 (en) | 2008-08-07 |
| WO2004083639A1 (en) | 2004-09-30 |
| DE10312899A1 (en) | 2004-10-07 |
| US7363850B2 (en) | 2008-04-29 |
| US20060039806A1 (en) | 2006-02-23 |
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