EP0188730B1 - Pompe à disphragme à diaphragme roulant actionné hydrauliquement - Google Patents

Pompe à disphragme à diaphragme roulant actionné hydrauliquement Download PDF

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Publication number
EP0188730B1
EP0188730B1 EP85115807A EP85115807A EP0188730B1 EP 0188730 B1 EP0188730 B1 EP 0188730B1 EP 85115807 A EP85115807 A EP 85115807A EP 85115807 A EP85115807 A EP 85115807A EP 0188730 B1 EP0188730 B1 EP 0188730B1
Authority
EP
European Patent Office
Prior art keywords
rolling
support
membrane
pressure chamber
rolling membrane
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
Application number
EP85115807A
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German (de)
English (en)
Other versions
EP0188730A2 (fr
EP0188730A3 (en
Inventor
Horst Dipl.-Ing. Fritsch
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.)
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa Herbert Ott GmbH and Co KG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6253563&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0188730(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Lewa Herbert Ott GmbH and Co KG filed Critical Lewa Herbert Ott GmbH and Co KG
Publication of EP0188730A2 publication Critical patent/EP0188730A2/fr
Publication of EP0188730A3 publication Critical patent/EP0188730A3/de
Application granted granted Critical
Publication of EP0188730B1 publication Critical patent/EP0188730B1/fr
Expired 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
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06—Pumps having fluid drive
    • F04B43/067—Pumps having fluid drive the fluid being actuated directly by a piston

Definitions

  • the invention relates to a diaphragm pump with a membrane designed as a rolling diaphragm, which separates a delivery chamber from a liquid-filled pressure chamber and is firmly clamped with its peripheral edge between a housing body and a pump cover, and with an oscillating hydraulic piston which is located in a bore of the housing body between the pressure chamber and a hydraulic reservoir for membrane actuation is displaceable, the rolling membrane alternately rolling or rolling on an outer roll cylinder formed by the wall of the pressure chamber and an inner roll cylinder which is formed by the peripheral surface of an axially displaceable support piston for the roll membrane, the end face of which is connected to the assigned surface section of the rolling membrane.
  • Flat or pre-formed plate-shaped flat membranes are used for high-pressure diaphragm pumps, the diaphragms of which are actuated exclusively hydraulically. These can either consist of plastic with an operating limit of up to approx. 350 bar delivery pressure or of metal with an application limit of up to 3000 bar delivery pressure.
  • the plastic flat membranes used have the advantage of high elasticity and thus a large deflection, so that such plastic flat membranes have relatively small diameters. However, they still result in much larger pump head diameters than a piston pump with the same power. The price difference between piston pump and diaphragm pump is correspondingly large.
  • a diaphragm pump of the above-mentioned type with a diaphragm designed as a rolling diaphragm is now known (e.g. from US Pat. No. 3,769,879), the rolling diaphragm alternately on an outer rolling cylinder formed by the wall of the pressure chamber and an inner one Rolls or unrolls the rolling cylinder, which is formed by the circumferential surface of a support piston for the rolling membrane, which can be displaced axially in the pressure chamber, the end face of which is connected to the assigned surface section of the rolling membrane.
  • a so-called liquid support for the roll membrane is provided at the transition point between the outer and inner roll cylinder.
  • a liquid support disadvantageously disregards the fact that a rolling membrane is relatively sensitive to pressure differences that occur and therefore always requires adequate support. This applies in particular to the rear limiting position of the rolling diaphragm at the end of the piston suction stroke, since in this rear limiting position the leakage supplementation, which is brought about via the snifting valve of the pump, and possibly also ventilation or degassing, usually takes place.
  • the rolling diaphragm In this state of sniffing the pump, however, the rolling diaphragm must be supported in a flawless manner or be able to put it on at a suitable point, since the sniffer valve only responds when there is a sufficient pressure difference between the hydraulic pressure chamber and the delivery chamber. However, this means that the rolling diaphragm is relatively heavily stressed at this moment if it is not properly supported. In extreme cases, a pressure difference can act on the diaphragm in its rear limiting position, which corresponds to the full delivery pressure of the pump, for example 350 bar. This case can occur when e.g. B. when the pump is at a standstill due to slight leakage, the pressure valve in the pump workspace sets the system pressure equal to the delivery pressure of the pump. For safety reasons, the roll membrane must be able to withstand this stress.
  • the invention is therefore based on the object of designing the diaphragm pump of the generic type in order to eliminate the disadvantages described in such a way that the rolling diaphragm, even in its rear limiting position, withstands the high stresses which may occur there, caused in particular by large pressure differences.
  • the diaphragm pump according to the invention with a hydraulically driven rolling diaphragm is also advantageously suitable for high delivery pressures, with the rolling diaphragm being properly supported in the rear limiting position; this causes damage on the conveying side when pressure is applied the rolling membrane is definitely avoided.
  • a gap-free contact surface is thus provided for the rolling membrane, which, when the rolling membrane is in its rear limiting position, is formed by the corresponding surfaces of the pressure chamber and the supporting mushroom for the rolling membrane.
  • Such a surface naturally has no bores. This is of particular importance in order to prevent the rolling diaphragm from contacting such bores with a prevailing pressure difference when the pump is sniffing.
  • the invention also makes it possible to use much smaller membrane diameters. This has the advantage of an extremely inexpensive construction, since a significantly smaller space is required. This is not least due to the fact that due to the much larger deflection of a rolling membrane compared to a flat membrane, the hydraulic cylinder used for the membrane drive can also have a significantly smaller diameter, so that the area under pressure is thereby smaller. In addition, the screw forces required for the pump are significantly reduced. This also makes a significant contribution to reducing the cost of a diaphragm pump with a rolling diaphragm.
  • a rolling membrane is basically a stocking-shaped rubber membrane which has an extremely long service life, since it can roll up and down with great frequency without breaking.
  • the rolling membrane which is made of a rubber-like material, accordingly rolls alternately on the outer rolling cylinder formed by the wall of the pressure chamber and on the inner rolling cylinder which is formed by the outer peripheral surface of the axially displaceable support mushroom. This rolling up and down of the rolling membrane takes place like the movement of a stocking or a sock when putting on and taking off.
  • the invention makes it possible for the first time to use rolling diaphragms in diaphragm pumps in which, in particular, higher delivery pressures have to be mastered and thus a hydraulic diaphragm drive is advantageous in order to ensure that a balanced pressure prevails on both sides of the diaphragm.
  • the configuration is such that the end faces of the support mushroom are firmly connected to the assigned surface section of the rolling diaphragm.
  • the inner roll cylinder is designed so that it forms a completely gap-free support surface in the rear limiting position of the roll membrane together with the outer roll cylinder, which is adapted to the natural deformation and roll geometry of the roll membrane.
  • the support mushroom in the rear limiting position is at least partially immersed in a pressure chamber section of smaller diameter, which adjoins the pressure chamber section of the larger diameter forming the outer rolling cylinder to form a support shoulder for the rolling membrane.
  • the stop for limiting the rear position of the supporting mushroom is expediently formed by an annular shoulder in the housing body, which is provided at the end of the pressure chamber section of smaller diameter.
  • the support mushroom has a guide rod which ensures an exactly central axial movement of the support mushroom.
  • the support mushroom or its guide rod has no mechanical connection with the hydraulic piston. This means that the support mushroom is only moved back and forth by the rolling membrane.
  • the support mushroom which is therefore independent of the kinematics of the hydraulic piston, fulfills two functions. On the one hand, it allows the rolling membrane to roll, which, when rolling, requires an outer roll cylinder formed by the wall of the pressure chamber and an inner roll cylinder formed by the outer circumferential surface of the support mushroom. On the other hand, the support mushroom fulfills the function of supporting the roll membrane.
  • the configuration according to the invention is such that in the rear limiting position of the roll membrane such an overall contour of support mushroom including pressure chamber is formed such that a gap-free area has arisen and thus the roll membrane is only pressed against completely smooth surfaces when a pressure difference occurs and accordingly not is at risk of damage.
  • the diaphragm pump shown has a pump housing in the form of a housing body 2 which is closed at the end by a pump cover 1 and in which an oscillating hydraulic piston 3 operates as a hydraulic diaphragm drive. This can be pushed back and forth in a bore 4 of the housing body and separates a pressure chamber 5 from a hydraulic reservoir 6.
  • a rolling membrane 7 is firmly clamped with its peripheral edge, which separates the pressure chamber 5 from a delivery chamber 8 in the manner shown in the drawing.
  • the pressure chamber 5 is completely filled with hydraulic fluid, so that when the hydraulic piston 3 is pushed back and forth, the rolling diaphragm 7 is actuated in a corresponding manner and acts on the delivery chamber 8 in the sense of a suction stroke or pressure stroke.
  • the pump cover 1 has a spring-loaded suction valve 9 and a spring-loaded pressure valve 10. These valves 9, 10 are connected to the delivery chamber 8 via an inlet channel 11 or an outlet channel 12 in such a way that the conveying medium during the suction stroke of the rolling diaphragm 7 to the right as shown in the drawing in the direction of arrow A via the suction valve 9 and the inlet channel 11 is sucked into the delivery chamber 8. In contrast, when the pressure stroke of the rolling membrane 7 to the left as shown in the drawing, the pumped medium is pressed out of the pump chamber 8 in a metered manner in the direction of arrow B via the outlet channel 12 and the pressure valve 10.
  • a support mushroom 13 is arranged axially displaceably within the pressure chamber 5 and has a guide rod 14 projecting axially backwards in the direction of the hydraulic piston 3. This is guided in an eye 15 arranged centrally in the pressure chamber 5 in such a way that an exactly centric axial movement of the supporting mushroom 13 is ensured.
  • the support mushroom 13 is connected at its end face to the associated surface section of the rolling membrane 7, so that the support mushroom 13 thereby follows the axial displacement movement of the rolling membrane 7.
  • the rolling surface required for the rolling membrane 7 is formed by an outer rolling cylinder and an inner rolling cylinder.
  • the peripheral wall 16 of the pressure chamber 5 represents the outer rolling cylinder
  • the inner rolling cylinder is formed by the outer peripheral surface 17 of the support mushroom 13.
  • a pressure chamber section 5 ′ of smaller diameter adjoins the actual pressure chamber 5 axially towards the rear in the direction of the hydraulic piston 3, a support shoulder 18 for the rolling membrane 7 being formed between the two pressure sections 5, 5 ′.
  • this support shoulder 18 is concave and has a radius of curvature which corresponds to the radius of curvature of the rolling membrane 7 in its rolling region.
  • the diameter and the depth of the smaller pressure chamber section 5 ' are held in such a way that the support mushroom 13 is immersed in this smaller pressure chamber section 5' for the most part in the rear limiting position according to FIG.
  • the front part of the support mushroom 13 only protrudes from the smaller pressure chamber section 5 'in such a way that only the rounded surface section 19 of the support mushroom 13, which forms the transition between the end face and the outer peripheral surface 17 of the support mushroom 13, is located in the larger pressure chamber section 5.
  • this gap-free support surface is composed of the outer roll cylinder, formed by the peripheral wall 16 of the pressure chamber 5, the support shoulder 18 and the rounded surface section 19 or the inner roll cylinder 17 of the support mushroom 13 including the support mushroom end face.
  • An annular shoulder 20 is provided as a stop to limit the rear position of the support mushroom 13, which is formed in the housing body 2 at the axially rear end of the pressure chamber section 5 'of smaller diameter.
  • a combined gas discharge and pressure relief valve 21 is connected to the hydraulic reservoir 6, which in turn opens via a channel 22 into the pressure chamber section 5 'of smaller diameter.
  • 13 radial flow channels 26 are provided in the peripheral wall 25 of the support mushroom. These are arranged such that they are completely small in the pressure chamber section 5 'in the rear limiting position of the rolling membrane 7 or the support mushroom 13 according to FIG. 3 ren diameter are immersed. This also ensures that a completely gap-free support surface is formed in the rear boundary position of the rolling membrane 7.
  • a sniffer valve 23 is also provided, which connects the hydraulic reservoir 6 via a channel 24 to the pressure chamber section 5 'of smaller diameter. This can in the rear boundary position of the rolling membrane 7, d. H. at the end of the suction stroke of the hydraulic piston 3, the necessary leakage from the hydraulic reservoir via the snifting valve 23 and the channel 24.
  • This channel 24 is arranged so that the connection to the hydraulic reservoir 6 via an annular groove 27 and a bore 28 in the mushroom guide rod 14 is only made when the mushroom 13 has reached the rear limit position, as can be seen in FIG.

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

Claims (6)

1. Pompe à membrane comportant une membrane qui est conçue sous forme de membrane déroulante, qui sépare une chambre de refoulement (8) d'avec une chambre de pression (5) remplie de liquide et qui est rigidement bridée entre un corps de carter et un couvercle de pompe, et comportant aussi un piston hydraulique oscillant (3) qui, pour manoeuvrer la membrane, peut coulisser dans un alésage (4) du corps de carter, entre la chambre de pression (5) et une chambre réservoir hydraulique (6), étant précisé que la membrane déroulante se déroule et s'enroule alternativement sur un cylindre extérieur de déroulement (16), formé par la paroi de la chambre de pression, et sur un cylindre intérieur de déroulement (17) qui est formé par la surface périphérique d'un piston d'appui (13), coulissant dans la chambre de pression, pour la membrane déroulante et dont la surface frontale est réunie à la portion plate correspondante de la membrane déroulante, caractérisée en ce que le cylindre intérieur de déroulement (17) du piston d'appui conçu comme champignon d'appui (13) se transforme, dans la position limite arrière de la membrane déroulante (7), en le cylindre extérieur de déroulement (16), en passant par un épaulement d'appui (18) qui, avec les deux cylindres de déroulement (17,16), forme, pour l'appui mécanique complet de la membrane déroulante (7), une surface d'appui (16, 18,17,19) sans discontinuité, adaptée aux caractéristiques géométriques naturelles de déformation et de déroulement de la membrane déroulante (7).
2. Pompe à membrane selon la revendication 1, caractérisée en ce que, dans la position limite arrière de la membrane déroulante (7), le champignon d'appui (13) plonge, au moins partiellement, dans une portion (5') de plus petit diamètre de la chambre de pression qui se raccorde à la portion (5) de plus grand diamètre de la chambre de pression, formant le cylindre extérieur de déroulement (16), avec formation de l'épaulement d'appui (18) pour la membrane déroulante (7).
3. Pompe à membrane selon la revendication 1 ou 2, caractérisée en ce que l'épaulement d'appui (18) prévu dans la chambre de pression (5) a une forme concave et présente un rayon de courbure qui correspond au rayon de courbure de la membrane déroulante (7) dans sa zone de déroulement.
4. Pompe à membrane selon la revendication 1 ou 2, caractérisée en ce que des canaux d'écoulement (26), dirigés radialement, sont disposés dans la paroi périphérique (25) du champignon d'appui (13) de façon telle que, dans la position limite arrière de la membrane déroulante (7), ils sont entièrement immergés dans la portion (5') de plus petit diamètre de la chambre de pression.
5. Pompe à membrane selon l'une des revendications 1 à 4, caractérisé en ce que la butée de limitation de la position arrière du champignon d'appui (13) est formée par un épaulement annulaire (20) prévu dans le corps (2) du carter.
6. Pompe à membrane selon l'une des revendications 1 à 5, caractérisée en ce que le champignon d'appui (13) présente une tige de guidage (14) qui garantit un mouvement axial exactement centré du champignon d'appui (13).
EP85115807A 1984-12-21 1985-12-11 Pompe à disphragme à diaphragme roulant actionné hydrauliquement Expired EP0188730B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843446914 DE3446914A1 (de) 1984-12-21 1984-12-21 Membranpumpe mit hydaulisch angetriebener rollmembran
DE3446914 1984-12-21

Publications (3)

Publication Number Publication Date
EP0188730A2 EP0188730A2 (fr) 1986-07-30
EP0188730A3 EP0188730A3 (en) 1987-03-25
EP0188730B1 true EP0188730B1 (fr) 1989-03-15

Family

ID=6253563

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85115807A Expired EP0188730B1 (fr) 1984-12-21 1985-12-11 Pompe à disphragme à diaphragme roulant actionné hydrauliquement

Country Status (4)

Country Link
US (1) US4749342A (fr)
EP (1) EP0188730B1 (fr)
JP (1) JPS61197779A (fr)
DE (1) DE3446914A1 (fr)

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Publication number Priority date Publication date Assignee Title
JPS6419191A (en) * 1987-07-14 1989-01-23 Nagano Keiki Seisakusho Kk Vacuum pump
US4930555A (en) * 1987-11-03 1990-06-05 The Coca-Cola Company Microgravity dispenser with agitator, metering device and cup filler
JPH0213184U (fr) * 1988-06-30 1990-01-26
US5262068A (en) * 1991-05-17 1993-11-16 Millipore Corporation Integrated system for filtering and dispensing fluid having fill, dispense and bubble purge strokes
DE4141670C2 (de) * 1991-12-17 1994-09-29 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe mit Membranhubbegrenzung
DE4327969C2 (de) * 1993-08-19 1997-07-03 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe
EP1048849B1 (fr) * 1996-06-07 2005-03-16 Hydro Leduc Pompe à haute pression pour tous liquides
US6071089A (en) * 1998-02-20 2000-06-06 General Motors Corporation Hydraulic diaphragm pump
US6276907B1 (en) 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump
US6478547B1 (en) 1999-10-18 2002-11-12 Integrated Designs L.P. Method and apparatus for dispensing fluids
US6899530B2 (en) * 2002-10-31 2005-05-31 Wanner Engineering, Inc. Diaphragm pump with a transfer chamber vent with a longitudinal notch on the piston cylinder
US6871577B2 (en) * 2003-01-31 2005-03-29 Tetra Laval Holdings & Finance, Sa Fill pump piston centering support
US20050254972A1 (en) * 2004-05-14 2005-11-17 Baker Rodney W Bench top pump
US7335003B2 (en) * 2004-07-09 2008-02-26 Saint-Gobain Performance Plastics Corporation Precision dispense pump
US20070134112A1 (en) * 2005-12-14 2007-06-14 Hupp Evan L Button diaphragm piston pump
JP4547350B2 (ja) 2006-04-13 2010-09-22 東レエンジニアリング株式会社 ピストンとそのピストンの製造方法及びそのピストンを備えたポンプ
WO2008007209A2 (fr) * 2006-07-11 2008-01-17 Bernhard Frey Système cylindre-piston pour pompe hydraulique ou moteur hydraulique
US20080260551A1 (en) * 2007-01-26 2008-10-23 Walter Neal Simmons Rolling diaphragm pump
DE102007007906A1 (de) 2007-02-14 2008-08-21 Gardner Denver Thomas Gmbh Membran-Förder-Pumpe sowie Förder-Membran für eine Membran-Förder-Pumpe
US7665974B2 (en) * 2007-05-02 2010-02-23 Wanner Engineering, Inc. Diaphragm pump position control with offset valve axis
JP5191618B2 (ja) * 2011-04-27 2013-05-08 Ｃｋｄ株式会社 送液ポンプ及び流量制御装置
DE102014200150A1 (de) * 2014-01-08 2015-07-09 Binder Gmbh Ventileinrichtung zum Steuern eines Fluids, insbesondere eines abrasiven Dickstoffs
US10100830B2 (en) 2014-11-18 2018-10-16 Tetra Laval Holdings & Finance S.A. Pump, a homogenizer comprising said pump and a method for pumping a liquid product
US9931449B2 (en) 2015-05-29 2018-04-03 Ameda, Inc. Electrical breast pump and system
EP3699429A4 (fr) 2017-10-17 2021-06-30 Nippon Pillar Packing Co., Ltd. Élément en résine
US10716882B2 (en) 2018-03-07 2020-07-21 Ameda, Inc. Apparatus and methods for universal breast pump kit
US11668292B2 (en) * 2019-04-23 2023-06-06 Nippon Pillar Packing Co., Ltd. Rolling diaphragm pump

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Also Published As

Publication number Publication date
DE3446914A1 (de) 1986-07-03
EP0188730A2 (fr) 1986-07-30
US4749342A (en) 1988-06-07
JPS61197779A (ja) 1986-09-02
EP0188730A3 (en) 1987-03-25
DE3446914C2 (fr) 1989-01-26
JPH0321757B2 (fr) 1991-03-25

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