EP0781922B1 - Doppelmembranpumpe - Google Patents

Doppelmembranpumpe 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
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English (en)
French (fr)
Other versions
EP0781922A1 (de
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 AT95203667T priority Critical patent/ATE197837T1/de
Priority to DE69519520T priority patent/DE69519520T2/de
Priority to EP95203667A priority patent/EP0781922B1/de
Publication of EP0781922A1 publication Critical patent/EP0781922A1/de
Application granted granted Critical
Publication of EP0781922B1 publication Critical patent/EP0781922B1/de
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. Doppeltwirkende Membranpumpe (1), umfassend eine erste Pumpenkammer (3), in der eine erste Membran (5) angeordnet ist, und eine zweite Pumpenkammer (4), in der eine mit der ersten Membran gekoppelte zweite Membran (6) angeordnet ist, wobei jede Pumpenkammer mit einer Verbindung (7) für ein Arbeitsfluid versehen ist und eine Steuervorrichtung mit jeder der Verbindungen gekoppelt ist, um ein Arbeitsfluid dosiert zuzuführen, welche Steuervorrichtung mindestens ein elektrisch gesteuertes pulsierendes Steuerventil (8, 9) zum Ausüben oder Abbauen des Drucks auf einer der Verbindungen mit der entsprechenden Pumpenkammer umfasst, dadurch gekennzeichnet, dass das mindestens eine Steuerventil so konstruiert ist, dass das mindestens eine Ventil eine Stellung aufweist, in der der Druck auf beiden Verbindungen mit den Pumpenkammmern gleichzeitig auf eine Weise abgebaut wird, die als Funktion der Zeit durch die Steuervorrichtung steuerbar ist.
  2. Membranpumpe nach Anspruch 1, die zwei Ein/Aus-Steuerventile enthält.
  3. Membranpumpe nach Anspruch 1, die ein Dreiwegventil enthält, bei dem eine Stellung eine Stellung ist, in der der Druck auf beiden Verbindungen abgebaut wird.
  4. Membranpumpe nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Steuervorrichtung einen Mikroprozessor umfasst.
  5. Verfahren zum Dosieren der Menge, die von einer doppelseitigen pneumatisch getriebenen Membranpumpe abgegeben wird, umfassend eine Steuerung der Frequenz und des Hubs von jeder der Membranen, dadurch gekennzeichnet, dass die Zeitdauer der 0-Stellung der Membranen gesteuert wird.
EP95203667A 1995-12-28 1995-12-28 Doppelmembranpumpe Expired - Lifetime EP0781922B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT95203667T ATE197837T1 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe
DE69519520T DE69519520T2 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe
EP95203667A EP0781922B1 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95203667A EP0781922B1 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe

Publications (2)

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

Family

ID=8221029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95203667A Expired - Lifetime EP0781922B1 (de) 1995-12-28 1995-12-28 Doppelmembranpumpe

Country Status (3)

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

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
KR101694596B1 (ko) 2008-10-22 2017-01-09 그라코 미네소타 인크. 휴대용 에어리스 스프레이어
EP3102829B1 (de) 2014-02-07 2019-03-13 Graco Minnesota Inc. Impulsfreie verdrängerpumpe und verfahren zur impulsfreien verdrängung von flüssigkeit
US11022106B2 (en) 2018-01-09 2021-06-01 Graco Minnesota Inc. High-pressure positive displacement plunger pump
US11986850B2 (en) 2018-04-10 2024-05-21 Graco Minnesota Inc. Handheld airless sprayer for paints and other coatings
CN117046639A (zh) 2019-05-31 2023-11-14 固瑞克明尼苏达有限公司 手持式流体喷雾器
CN115362316A (zh) 2020-03-31 2022-11-18 固瑞克明尼苏达有限公司 电动操作的往复式泵
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
GB2112870B (en) * 1981-12-23 1985-05-09 Champion Spark Plug Co Diaphragm pumps
US4818191A (en) * 1982-03-31 1989-04-04 Neyra Industries, Inc. Double-acting diaphragm pump system
EP0386610A1 (de) * 1989-03-07 1990-09-12 John Russell Schneider Gleichstrompumpe
EP0582625B2 (de) * 1991-05-03 2005-01-05 MEINZ, Hans Willi Verfahren und vorrichtung zur kontrollierten dosierung mindestenseiner fliessfähigen komponente

Also Published As

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

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