EP0919724A2 - Hydraulisch angetriebene Doppelmembranpumpe - Google Patents

Hydraulisch angetriebene Doppelmembranpumpe Download PDF

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Publication number
EP0919724A2
EP0919724A2 EP98830707A EP98830707A EP0919724A2 EP 0919724 A2 EP0919724 A2 EP 0919724A2 EP 98830707 A EP98830707 A EP 98830707A EP 98830707 A EP98830707 A EP 98830707A EP 0919724 A2 EP0919724 A2 EP 0919724A2
Authority
EP
European Patent Office
Prior art keywords
oil
pumping
suction
tank
units
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
EP98830707A
Other languages
English (en)
French (fr)
Other versions
EP0919724B1 (de
EP0919724A3 (de
Inventor
Giuseppe Corallo
Aldo Franchi
Luciano Cardinali
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.)
Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Original Assignee
Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
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 Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA filed Critical Agenzia Nazionale per le Nuove Tecnologie lEnergia e lo Sviluppo Economico Sostenibile ENEA
Publication of EP0919724A2 publication Critical patent/EP0919724A2/de
Publication of EP0919724A3 publication Critical patent/EP0919724A3/de
Application granted granted Critical
Publication of EP0919724B1 publication Critical patent/EP0919724B1/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
    • F04B43/0733—Pumps having fluid drive the actuating fluid being controlled by at least one valve with fluid-actuated pump inlet or outlet valves; with two or more pumping chambers in series

Definitions

  • the present invention relates to a device for pumping liquids or aeriform substances, with double-acting reciprocating motion obtained hydraulically.
  • Liquid and aeriform pumping systems can be substantially subdivided into two classes: (a) fluid dynamic action systems, such as for example centrifugal pumps and the like, based on the laws of fluid dynamics and on the transfer between the momentum and the mechanical energy, and (b) positive-displacement systems, based on the variation of the volume enclosed in a pump casing by both direct and indirect mechanical action by means of a working fluid.
  • fluid dynamic action systems such as for example centrifugal pumps and the like
  • positive-displacement systems based on the variation of the volume enclosed in a pump casing by both direct and indirect mechanical action by means of a working fluid.
  • the present invention relates to a device for pumping liquids or aeriform substances of the above-mentioned type, which is included in the system class of the(b) group indicated above.
  • Said device is schematized in the annexed figure 1, and it is a reciprocating positive displacement pumping system indirectly operated by a fluid (oil) pressurized in a continuous way by means of a rotary positive displacement pump, in particular a gear pump which cooperates by means of a mechanical transmission of the same driving force which operates the pump, with a rotary valve which reverses the oil flow between the reciprocating pumping unit and a tank.
  • Figure 2 shows the behavior, as a function of time, of the flow rate of a pumping system such as the one showed in figure 1 according to the Italian patent No 1,262,358 previously referred to.
  • the pumping action is of a pulsating type, and the flow rate or delivery is similar to a square wave.
  • the pulsation is due to the fact that the diaphragm pumping unit (figure 1) is of the single acting type, and corresponds to the electrical analogy of a single half-wave rectifier.
  • Such pulsating behavior can suit numerous applications, but. in the case of high flow rates and pressures the pulsation of the pumped fluid, be it a liquid or an aeriform substance, may involve many problems such as periodic stresses in the system fed by the pump, with possible drawbacks due to fatigue stress of the components, noise and flow discontinuity which can prove harmful to refrigerators or heat pumps operating on an absorption cycle, as it is well-known to a man skilled in the art.
  • the aim of the present invention is to provide a device for pumping liquids or aeriform substances with a double-acting reciprocating motion or action, with diaphragm pumping units, or the like, of the class described in the above-mentioned Italian patent.
  • a pumping system of the type being discussed which comprises at least two pumping units, provided with a separating element which is formed by a diaphgram or the like, said pumping units being operated by a pressurized hydraulic fluid (oil), and working in a push-pull manner so as to obtain a double-acting pumping action and a substantial elimination of fluctuations in the flow rate and/or pressure at the outlet side of the pumping system, wherein the fluid of said two diaphragm pumping units is combined by means of a valve assembly, in a similar way to what is known in electrotechnics as "Graetz bridge", according to which the outlet flow of the pumping system is practically continuous and free from unwanted pulsations, particularly as regards liquids.
  • An oil control assembly which comprises a prime motor consisting of an electric motor 10 which operates a positive displacement rotary pump 11, in particular a gear pump, to move a driving fluid (oil).
  • the transmission of mechanical operation by gear pump 11 through a reduction gear 12 operates a rotary valve 13 which supplies or withdraws oil from a first diaphragm pumping unit 14 and from a second diaphragm pumping unit 15.
  • the circuit of the oil which is the working fluid, and the arrangement of the ways of the rotary valve 13 imply a push-pull working of the pumping units 14 and 15, that is a 180° phase shift between the flow rate/pressure pulsations generated in the pumped fluid.
  • the "voids" shown in the schematization of the operative modes of the single-acting pumping system of figure 2 are eliminated.
  • a tank 16, not pressurized is provided, which, in order to compensate the expansion of the working fluid (oil), operates like an expansion tank, wherein the excess pressure from the pump 11 is discharged by means of a calibrated overpressure or safety valve 17.
  • Makeup oil can be withdrawn from the tank or expansion tank by means of a valve 18 which can be suitably calibrated, in order to prevent short circuits at the oil side during intake at low pressures.
  • This valve 18 is calibrated at a suitably low pressure to allow the suction of fluids at pressures equal or higher than the calibration pressure.
  • the pipe coming from the valve 18, together with the oil intake line at the side of the diaphragm units 14, 15 leads to tank 19 wherein a filter F is possibly located, which has an outlet 20 connected to the intake side of the gear pump 11.
  • An assembly of unidirectional valves 21, 22,23,24 in the configuration which is well known in electronics as "Graetz bridge", is located on the process side of the diaphragm pumping units 14,15.
  • the valves 21,22,23,24 are respectively connected to suction 25 and delivery 26 pipes.
  • figure 5 a second variant of the practical embodiment of figure 4 is shown.
  • a further safety valve 27, which is calibrated at a lower pressure than safety valve 17, can be provided on the delivery side of the pump 11.
  • the valve 27 is closed during the normal operation of the system, while, on the contrary, it is used during the first minutes of the system startup only to allow the discharge of the possible excess oil let into the charge, together with the one resulting from the thermal expansion at the normal operating temperature.
  • the variant of figure 6 corresponds to the one of figure 5.
  • the tank is partially full and the free space 28 over the oil mass serves as an expansion space to compensate the thermal expansions of the oil.
  • FIG. 7 A further embodiment is shown in figure 7, corresponding in part to the one in figure 6.
  • the pressure on the intake side of the diaphragm pumping units will have to be higher than the atmospheric pressure at least by the value required to overcome the elasticity of the diaphragm added to the pressure losses on the oil side. Otherwise, as it is evident, no pumping action would take place.
  • a diaphragm expansion tank 30 in the circuit of the working oil, is provided, only partially filled with oil.
  • the diaphragm expansion tank 30 allows the thermal expansion of the oil by means of the discharge valve, while the calibrated makeup valve allows the normal pumping with intake of oil from the diaphragm units and, only for makeup, also from the expansion tank.
  • the expansion tank 30 is connected on the side opposite to the oil side, to the intake pipe on the process side, so as to cause the makeup pressure of the makeup valve to adjust automatically to the intake pressure on the process side, hence eliminating the occurrence of short-circuits on the oil side.
  • the oil circuit remains sealed on the environment side in order to prevent leaks of harmful substances in case of a break of the pumping units' diaphragms.
  • Said separation between the oil and the process fluid can be obtained, as it is known to a man skilled in the art, by means of elastic seals between the cylinder and the piston with or without the aid of a so-called "lantern” separating the cylinder on the process side from the cylinder on the oil side.
  • the free-piston pumping unit comprises a cylinder 40 inside which a piston 41, kept sealed by seals 42, can slide.
  • the piston 41 defines a first control chamber 43 wherein a working fluid (oil) can be forwarded and withdrawn by means of a line 44, and a second working or positive displacement pumping chamber 45, which cooperates with a delivery valve 46 and a suction valve 47.
  • the valves 46, 47 are respectively shown as unidirectional valves of the ball type with a conical seat, however, it is clear that they can be of other shapes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
EP98830707A 1997-11-28 1998-11-25 Hydraulisch angetriebene Doppelmembranpumpe Expired - Lifetime EP0919724B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM970739 1997-11-28
IT97RM000739A IT1297087B1 (it) 1997-11-28 1997-11-28 Dispositivo per il pompaggio di liquidi o aeriformi, con moto alternativo a doppio effetto ottenuto per via idraulica.

Publications (3)

Publication Number Publication Date
EP0919724A2 true EP0919724A2 (de) 1999-06-02
EP0919724A3 EP0919724A3 (de) 2000-04-19
EP0919724B1 EP0919724B1 (de) 2005-07-06

Family

ID=11405377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830707A Expired - Lifetime EP0919724B1 (de) 1997-11-28 1998-11-25 Hydraulisch angetriebene Doppelmembranpumpe

Country Status (3)

Country Link
EP (1) EP0919724B1 (de)
DE (1) DE69830775T2 (de)
IT (1) IT1297087B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2740935A1 (de) * 2012-12-05 2014-06-11 Smartbrain Flüssigkeitsvorrichtung
CN102124226B (zh) * 2008-08-14 2014-09-17 Spx流动技术诺德斯泰特股份有限公司 泵装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101245779B (zh) * 2008-03-07 2010-04-21 上海凯泉泵业（集团）有限公司 往复式油隔离隔膜泵液力端的油平衡系统
DE202008010872U1 (de) 2008-08-14 2010-02-25 Bran+Luebbe Gmbh Pumpenvorrichtung
DE102021125005A1 (de) 2021-09-28 2023-03-30 Lewa Gmbh Membranpumpe mit hydraulischem Antrieb

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2703055A (en) * 1950-07-21 1955-03-01 Shell Dev Diaphragm-type mud pump
US4523901A (en) * 1981-10-17 1985-06-18 Barmag Barmer Maschinenfabrick Ag Control apparatus for a positive displacement reciprocating pump
FR2549904B1 (fr) * 1983-07-27 1987-11-06 Paul Hydraulique Pompe a haute pression pour liquide
US4543044A (en) * 1983-11-09 1985-09-24 E. I. Du Pont De Nemours And Company Constant-flow-rate dual-unit pump
EP0568742A1 (de) * 1992-05-08 1993-11-10 Cooper Industries, Inc. Förderung von Produktionsflüssigkeit aus einem Bohrloch
IT1262358B (it) * 1993-04-16 1996-06-19 Enea Ente Nuove Tec Dispositivo per il pompaggio dei liquidi con pompa a membrana azionatada circuito idraulico.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102124226B (zh) * 2008-08-14 2014-09-17 Spx流动技术诺德斯泰特股份有限公司 泵装置
EP2740935A1 (de) * 2012-12-05 2014-06-11 Smartbrain Flüssigkeitsvorrichtung

Also Published As

Publication number Publication date
EP0919724B1 (de) 2005-07-06
EP0919724A3 (de) 2000-04-19
DE69830775T2 (de) 2006-05-18
ITRM970739A1 (it) 1999-05-28
DE69830775D1 (de) 2005-08-11
IT1297087B1 (it) 1999-08-03

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