EP0188730A2 - 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
EP0188730A2
EP0188730A2 EP85115807A EP85115807A EP0188730A2 EP 0188730 A2 EP0188730 A2 EP 0188730A2 EP 85115807 A EP85115807 A EP 85115807A EP 85115807 A EP85115807 A EP 85115807A EP 0188730 A2 EP0188730 A2 EP 0188730A2
Authority
EP
European Patent Office
Prior art keywords
rolling
membrane
support
pressure chamber
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.)
Granted
Application number
EP85115807A
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German (de)
English (en)
Other versions
EP0188730A3 (en
EP0188730B1 (fr
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 GmbH
Lewa Herbert Ott GmbH and Co KG
Original Assignee
Lewa GmbH
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
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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(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Lewa GmbH, Lewa Herbert Ott GmbH and Co KG filed Critical Lewa GmbH
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 rolling cylinder formed by the wall of the pressure chamber, which is formed by the peripheral surface of an axially displaceable support piston for the rolling membrane, the end face with the associated surface section the rolling membrane is connected.
  • 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 be made 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 flat membrane made of plastic is the advantage a 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.
  • diaphragm shapes in diaphragm pumps, particularly those for high delivery pressures, which allow larger deflections and thus smaller diameters than flat diaphragms.
  • a diaphragm pump of the aforementioned type with a diaphragm designed as a rolling diaphragm is now known, the rolling diaphragm alternately rolling on and off an outer rolling cylinder formed by the wall of the pressure chamber and an inner rolling cylinder which is axially defined by the circumferential surface of an Pressure chamber displaceable support piston for the rolling membrane is formed, the end face of which is connected to the associated 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 limit position of the rolling diaphragm at the end of the piston suction stroke, since it is in this rear limit position, the leakage supplementation, which is brought about via the snifting valve of the pump, and possibly also ventilation or degassing, is carried out.
  • 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 an extreme case, 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 can occur if, for example, when the pump is at a standstill due to slight leakage, the pressure valve in the pump work space 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 eliminating the diaphragm pump of the generic type to design the disadvantages described in such a way that the rolling diaphragm withstands the high stresses that may occur there, caused in particular by large pressure differences, even in its rear limiting position.
  • 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 reliably prevents damage to the roller membrane when pressure is applied to the conveyor side.
  • a completely gap-free contact surface is thus provided for the rolling membrane, which is formed by the corresponding surfaces of the pressure chamber and the support mushroom for the rolling membrane when the rolling membrane is in its rear limiting position.
  • Such a surface naturally has no bores. This is from be of particular importance in order to prevent the roller diaphragm from contacting such bores with a prevailing pressure difference when the pump is in the sniffing state.
  • 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 that 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 unrolling cylinder is designed in such a way that in the rear limiting position of the rolling membrane, together with the outer unrolling cylinder, it forms a completely gap-free support surface which is adapted to the natural deformation and rolling geometry of the rolling 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 support 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 design according to the invention is made such that in the rear limiting position of the rolling membrane such an overall contour of the supporting mushroom including the pressure chamber is formed such that a gap-free area has been created and the rolling membrane is therefore only pressed against completely smooth surfaces when a pressure difference occurs and accordingly not is at risk of damage.
  • the diameter of the rolling membrane can be of the order of magnitude Diameter of the hydraulic piston, so that the screw forces required for the diaphragm pump are much smaller. For example, reducing the diaphragm diameter to half the previous diameter results in a reduction of the screw forces to a quarter of the previous effort.
  • 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 hydraulic liquid filled, 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 via an inlet channel 11 or an outlet channel 12 to the delivery chamber 8 in such a way that the conveying medium during the suction stroke of the rolling membrane 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 central axial movement of the supporting mushroom 13 is ensured.
  • the support mushroom 13 is connected on its end face to the assigned 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 by an outer rolling cylinder and a inner roll cylinder formed.
  • 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 rearwards 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 in the rear boundary position according to FIG. 3 is for the most part immersed in this smaller pressure chamber section 5'.
  • the front part of the support mushroom 13 protrudes only so far out of the smaller pressure chamber section 5 '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 limiting 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 immersed in the pressure chamber section 5 'of smaller diameter in the rear limiting position of the rolling membrane 7 or the support mushroom 13 according to FIG. 3. 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 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 shown in Fig. 3.
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 true EP0188730A2 (fr) 1986-07-30
EP0188730A3 EP0188730A3 (en) 1987-03-25
EP0188730B1 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)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0547404A1 (fr) * 1991-12-17 1993-06-23 LEWA Herbert Ott GmbH + Co. Pompe à membrane actionnée hydrauliquement avec limitation du mouvement de la membrane
WO2001012990A1 (fr) * 1999-08-12 2001-02-22 Wagner Spray Tech Corporation Pompe a membrane
EP1959140A1 (fr) 2007-02-14 2008-08-20 Gardner Denver Thomas GmbH Pompe d'administration à diaphragme et diaphragme de pompe pour pompe d'administration à diaphragme
WO2016079127A1 (fr) * 2014-11-18 2016-05-26 Tetra Laval Holdings & Finance S.A. Pompe, homogénéisateur comprenant ladite pompe et procédé de pompage d'un porduit liquide

Families Citing this family (23)

* Cited by examiner, † Cited by third party
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
DE4327969C2 (de) * 1993-08-19 1997-07-03 Ott Kg Lewa Hydraulisch angetriebene Membranpumpe
WO1997047883A1 (fr) * 1996-06-07 1997-12-18 Hydro Rene Leduc Pompe a haute pression pour tous liquides
US6071089A (en) * 1998-02-20 2000-06-06 General Motors Corporation Hydraulic diaphragm pump
JP3958926B2 (ja) 1999-10-18 2007-08-15 インテグレイテッド・デザインズ・リミテッド・パートナーシップ 流体を分配する装置および方法
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
US7665974B2 (en) * 2007-05-02 2010-02-23 Wanner Engineering, Inc. Diaphragm pump position control with offset valve axis
EP2653724B1 (fr) * 2011-04-27 2015-09-23 CKD Corporation Pompe d'alimentation en liquide et dispositif de régulation du débit
DE102014200150A1 (de) * 2014-01-08 2015-07-09 Binder Gmbh Ventileinrichtung zum Steuern eines Fluids, insbesondere eines abrasiven Dickstoffs
US9931449B2 (en) 2015-05-29 2018-04-03 Ameda, Inc. Electrical breast pump and system
CN111164308B (zh) 2017-10-17 2021-10-22 日本皮拉工业株式会社 树脂部件
US10716882B2 (en) 2018-03-07 2020-07-21 Ameda, Inc. Apparatus and methods for universal breast pump kit
JP7420794B2 (ja) * 2019-04-23 2024-01-23 日本ピラー工業株式会社 ローリングダイアフラムポンプ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295458A (en) * 1964-08-13 1967-01-03 Adam P G Steffes Pump
US3769879A (en) * 1971-12-09 1973-11-06 A Lofquist Self-compensating diaphragm pump
US3775030A (en) * 1971-12-01 1973-11-27 Wanner Engineering Diaphragm pump

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Publication number Priority date Publication date Assignee Title
US2820434A (en) * 1955-07-18 1958-01-21 Johnson Service Co Single-acting motor with pneumatic return spring
US3203186A (en) * 1960-08-25 1965-08-31 Edwin J Lukas Force transmitting system
GB961750A (en) * 1962-06-12 1964-06-24 David Horace Young Improvements relating to pumps
GB1005555A (en) * 1963-04-06 1965-09-22 Daimler Benz Ag Improvements relating to brake devices operated by pressure fluid
NL139803B (nl) * 1963-10-25 1973-09-17 Philips Nv Inrichting voor het comprimeren respectievelijk expanderen van een medium voorzien van een regelinrichting voor het regelen van de grootte van het schadelijke volume.
US3884598A (en) * 1973-10-05 1975-05-20 Wanner Engineering Piston assembly for diaphragm pump
JPS6114924Y2 (fr) * 1977-11-08 1986-05-09
ZA796067B (en) * 1978-11-21 1980-10-29 Lucas Industries Ltd Servo boosters for vehicle braking systems

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3295458A (en) * 1964-08-13 1967-01-03 Adam P G Steffes Pump
US3775030A (en) * 1971-12-01 1973-11-27 Wanner Engineering Diaphragm pump
US3769879A (en) * 1971-12-09 1973-11-06 A Lofquist Self-compensating diaphragm pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0547404A1 (fr) * 1991-12-17 1993-06-23 LEWA Herbert Ott GmbH + Co. Pompe à membrane actionnée hydrauliquement avec limitation du mouvement de la membrane
WO2001012990A1 (fr) * 1999-08-12 2001-02-22 Wagner Spray Tech Corporation Pompe a membrane
US6276907B1 (en) 1999-08-12 2001-08-21 Wagner Spray Tech Corporation Hydraulically driven diaphragm pump
EP1959140A1 (fr) 2007-02-14 2008-08-20 Gardner Denver Thomas GmbH Pompe d'administration à diaphragme et diaphragme de pompe pour pompe d'administration à diaphragme
WO2016079127A1 (fr) * 2014-11-18 2016-05-26 Tetra Laval Holdings & Finance S.A. Pompe, homogénéisateur comprenant ladite pompe et procédé de pompage d'un porduit liquide
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

Also Published As

Publication number Publication date
EP0188730A3 (en) 1987-03-25
DE3446914A1 (de) 1986-07-03
US4749342A (en) 1988-06-07
JPH0321757B2 (fr) 1991-03-25
JPS61197779A (ja) 1986-09-02
EP0188730B1 (fr) 1989-03-15
DE3446914C2 (fr) 1989-01-26

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