EP0781922B1 - Pompe à membrane à double effet - Google Patents

Pompe à membrane à double effet Download PDF

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Publication number
EP0781922B1
EP0781922B1 EP95203667A EP95203667A EP0781922B1 EP 0781922 B1 EP0781922 B1 EP 0781922B1 EP 95203667 A EP95203667 A EP 95203667A EP 95203667 A EP95203667 A EP 95203667A EP 0781922 B1 EP0781922 B1 EP 0781922B1
Authority
EP
European Patent Office
Prior art keywords
membrane
pump
control
valve
double
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
Application number
EP95203667A
Other languages
German (de)
English (en)
Other versions
EP0781922A1 (fr
Inventor
Johannes Pierik
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.)
Van Wijk Engineering BV
Original Assignee
Van Wijk Engineering BV
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 Van Wijk Engineering BV filed Critical Van Wijk Engineering BV
Priority to DE69519520T priority Critical patent/DE69519520T2/de
Priority to EP95203667A priority patent/EP0781922B1/fr
Priority to AT95203667T priority patent/ATE197837T1/de
Publication of EP0781922A1 publication Critical patent/EP0781922A1/fr
Application granted granted Critical
Publication of EP0781922B1 publication Critical patent/EP0781922B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04B43/073—Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • F04B43/0736—Pumps having fluid drive the actuating fluid being controlled by at least one valve with two or more pumping chambers in parallel

Definitions

  • the present invention relates to a double-acting membrane pump according to the preamble of claim 1.
  • a double-acting membrane pump of this type is disclosed in both European Application 0 386 610 and US Patent 4 818 191.
  • Pumps of this type are used, inter alia, for filling packs and other containers of all manner of types.
  • One application is the filling of paint cans.
  • the pump disclosed in the general prior art is provided with a control device which, like the pump, operates pneumatically.
  • This control device comprises a pneumatic reciprocating piston which alternately brings the plenum chamber behind the first membrane and the plenum chamber behind the second membrane under pressure. Change-over from the one position to the other position of the control piston is determined by the relevant membranes coupled to one another reaching the extreme position.
  • the reciprocating piston of the device moves to and fro with a specific frequency, which is dependent on the medium pumped and, to a lesser extent, on the pressure of the compressed air.
  • This frequency cannot be influenced during the filling cycle.
  • changing the air pressure supplied gives rise to the risk that the pump comes to a standstill.
  • This too is a disadvantage because, when filling containers to a specific fill weight or volume, in the first instance material can be supplied at high speed whereas at a later stage it is necessary to work at a lower speed. This can be avoided by incorporating an air speed control upstream. With this arrangement the pump still has to execute complete strokes, which leads to the said poor meterability.
  • a solution to this problem has been found by the provision of a valve or shut-off device which has various passages. That is to say, a pre-setting of the valve is achieved, by which means the metering accuracy can be set.
  • WO 92/19867A discloses a membrane pump, comprising two halves which are not connected to each other, i.e. this pump is not double-acting.
  • FR 2518660 A shows a double-acting membrane pump being controlled by a control valve having two discrete positions.
  • the aim of the present invention is to provide a metering system with which it is possible to meter highly fluctuating amounts of fluid without this resulting in an excessive rise in the cost price of the double-acting membrane pump and the control thereof.
  • the insight on which the invention is based is not to allow the one stroke of the one membrane to follow directly on the preceding stroke of the other membrane.
  • a controllable pause can be inserted using the valve according to the invention. As a result, it is also possible to allow only one membrane to carry out work.
  • a control of this type can be achieved relatively simply using the microprocessors currently available.
  • a three-position valve which can be set to a fixed position in each of the three positions.
  • the first position is then, for example, the control for the one membrane, the second position the control for the second membrane and the third position a position in which the pressure on both membranes is relieved.
  • the "flow" can be controlled by varying the frequency.
  • the membrane pump according to the invention is, moreover, of double-acting construction, a continuous, non-pulsating, output flow of fluid can be obtained, the volume of which can be accurately controlled.
  • a container can, for example, be filled accurately on the basis of weight or fill height.
  • This control valves preferably have a throttle function.
  • the control valves can be of rapidly pulsing design. By, for example, actuating a membrane for a specific time, such a membrane executes a stroke to one side. If the relevant air pulse is sufficiently large, the membrane will execute the complete stroke. In the case of a smaller air pulse, the membrane will execute a short stroke. It is possible to reverse the direction of movement without the end position having to be reached.
  • the delivery of the pump can be controlled by controlling the duration of the air pulses and the time at which these are applied. With short air pulses, the membranes of the pump will execute only short strokes, as a result of which a low flow can be realised. As a result of the double character of the pump, a pulsing action of this type is not reflected in the metered amount of fluid.
  • the pump shown in the single figure is indicated in its entirety by 1. This pump is controlled by a controller indicated in its entirety by 2.
  • Pump 1 consists of a first pump chamber 3 and a second pump chamber 4. These chambers are separated by, respectively, a first membrane 5 and a second membrane 6 from a first plenum chamber 11 and a second plenum chamber 12. The membranes are connected to one another via a coupling rod 13. Plenum chambers 11 and 12 are provided with openings 7. In this way plenum chamber 11 is connected to line 14 and plenum chamber 12 to line 15. Line 14 is connected to the first control valve 8, whilst line 15 is connected to second control valve 9. These lines are supplied with air via a line 16. Valves 8 and 9 are controlled by a microprocessor 17. The latter is provided with an input 18 which can be connected to a further microprocessor, which, for example, can be controlled by a weighing unit.
  • the common inlet of the membrane pump is indicated by 19 and the common outlet by 20. Ball valves 21 are present.
  • a membrane pump of this type is generally known in the prior art.
  • the pumps are marketed by Wilden, model M.025 and model M1.
  • the apparatus described above functions as follows.
  • microprocessor 17 controls control valves 8 and 9 in a pulsing manner with a specific frequency.
  • a long pulse is emitted so that the membrane will travel over a relatively long path before the function of the valves 8 and 9 is reversed so that the working direction of the membranes is reversed.
  • a short pulse is given, the stroke of the membrane concerned will likewise be shorter.
  • throttle device 10 can be (partially) replaced.
  • control valve 8 opens for 250 milliseconds.
  • Valve 9 then opens for 250 milliseconds, whilst air bleeds from valve 8, etc.
  • valve 8 opens for 125 milliseconds and is vented for 125 milliseconds without valve 9 being actuated (pause), after which valve 9 is opened for 125 milliseconds and is then vented, etc.
  • valve 8 opens for 50 milliseconds and is vented for 200 milliseconds without valve 9 being actuated (pause), after which valve 9 is opened in the same way.

Landscapes

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

Claims (5)

  1. Pompe à membrane à double effet (1) comprenant une première chambre de pompe (3) dans laquelle est disposée une première membrane (5) et une seconde chambre de pompe (4) dans laquelle est disposée une seconde membrane (6) couplée à la première membrane, chaque chambre de pompe étant munie d'une connexion (7) pour un fluide de travail et un dispositif de commande étant raccordé à chacune desdits connexions pour l'alimentation dosée en fluide de travail, le dispositif de commande comprenant au moins une soupape de commande pulsante (8, 9) à commande électrique pour appliquer ou relâcher la pression sur l'une des connexions vers la chambre de pompe concernée, caractérisée en ce que ladite au moins une soupape de commande est agencée de telle sorte que ladite au moins une soupape possède une position dans laquelle la pression sur les deux connexions vers les chambres de pompe est relâchée en même temps d'une manière commandable en fonction du temps par le dispositif de commande.
  2. Pompe à membrane selon la revendication 1, contenant deux soupapes de commande marche/arrêt.
  3. Pompe à membrane selon la revendication 1, contenant une soupape à trois voies, une position étant une position dans laquelle la pression est relâchée sur les deux connexions.
  4. Pompe à membrane selon l'une des revendications précédentes, caractérisée en ce que le dispositif de commande comprend un microprocesseur.
  5. Procédé pour doser la quantité délivrée par une pompe à membrane entraínée pneumatiquement à deux faces, comprenant la commande de la fréquence et de la course de chacune des membranes, caractérisé en ce que la durée de la position 0 des membranes est commandée.
EP95203667A 1995-12-28 1995-12-28 Pompe à membrane à double effet Expired - Lifetime EP0781922B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69519520T DE69519520T2 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe
EP95203667A EP0781922B1 (fr) 1995-12-28 1995-12-28 Pompe à membrane à double effet
AT95203667T ATE197837T1 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95203667A EP0781922B1 (fr) 1995-12-28 1995-12-28 Pompe à membrane à double effet

Publications (2)

Publication Number Publication Date
EP0781922A1 EP0781922A1 (fr) 1997-07-02
EP0781922B1 true EP0781922B1 (fr) 2000-11-29

Family

ID=8221029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95203667A Expired - Lifetime EP0781922B1 (fr) 1995-12-28 1995-12-28 Pompe à membrane à double effet

Country Status (3)

Country Link
EP (1) EP0781922B1 (fr)
AT (1) ATE197837T1 (fr)
DE (1) DE69519520T2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10354314B4 (de) * 2003-11-20 2006-06-01 Thomas Kwapis Unterwassermotorschlitten
AU2009308070B2 (en) 2008-10-22 2015-08-20 Graco Minnesota Inc. Portable airless sprayer
WO2015119717A1 (fr) 2014-02-07 2015-08-13 Graco Minnesota Inc. Pompe volumétrique non pulsée et procédé de déplacement de fluide non pulsé
US11022106B2 (en) 2018-01-09 2021-06-01 Graco Minnesota Inc. High-pressure positive displacement plunger pump
EP3774069A1 (fr) 2018-04-10 2021-02-17 Graco Minnesota Inc. Pulvérisateur sans air portatif pour peintures et autres revêtements
US20220234062A1 (en) 2019-05-31 2022-07-28 Graco Minnesota Inc. Handheld fluid sprayer
EP4127471A1 (fr) 2020-03-31 2023-02-08 Graco Minnesota Inc. Pompe à déplacement électrique
US10968903B1 (en) 2020-06-04 2021-04-06 Graco Minnesota Inc. Handheld sanitary fluid sprayer having resilient polymer pump cylinder
US10926275B1 (en) 2020-06-25 2021-02-23 Graco Minnesota Inc. Electrostatic handheld sprayer
CN114922801B (zh) * 2022-04-27 2023-11-28 上海侠飞泵业有限公司 高压气动隔膜泵

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU553956B2 (en) * 1981-12-23 1986-07-31 Devilbiss Company, The Twin coupled-diaphragm pump
US4818191A (en) * 1982-03-31 1989-04-04 Neyra Industries, Inc. Double-acting diaphragm pump system
EP0386610A1 (fr) * 1989-03-07 1990-09-12 John Russell Schneider Pompe à débit constant
WO1992019867A1 (fr) * 1991-05-03 1992-11-12 Hans Willi Meinz Procede et dispositif pour le dosage controle d'au moins un composant coulant

Also Published As

Publication number Publication date
DE69519520T2 (de) 2001-06-13
EP0781922A1 (fr) 1997-07-02
DE69519520D1 (de) 2001-01-04
ATE197837T1 (de) 2000-12-15

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