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EP0627555B1 - Dispositif de pompage de liquides à l'aide d'une pompe à membrane actionnée par un circuit hydraulique - Google Patents

Dispositif de pompage de liquides à l'aide d'une pompe à membrane actionnée par un circuit hydraulique Download PDF

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Publication number
EP0627555B1
EP0627555B1 EP94830178A EP94830178A EP0627555B1 EP 0627555 B1 EP0627555 B1 EP 0627555B1 EP 94830178 A EP94830178 A EP 94830178A EP 94830178 A EP94830178 A EP 94830178A EP 0627555 B1 EP0627555 B1 EP 0627555B1
Authority
EP
European Patent Office
Prior art keywords
rotary
pump
diaphragm pump
diaphragm
pumping device
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
EP94830178A
Other languages
German (de)
English (en)
Other versions
EP0627555A1 (fr
Inventor
Luciano Cardinali
Giuseppe Corallo
Bruno De Crescenzo
Aldo Franchi
Giovanni Pede
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
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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 EP0627555A1 publication Critical patent/EP0627555A1/fr
Application granted granted Critical
Publication of EP0627555B1 publication Critical patent/EP0627555B1/fr
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
    • F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
    • F25B15/025—Liquid transfer means

Definitions

  • the present invention relates to devices for the displacement of liquids and particularly a device for pumping liquids provided with a diaphragm pump which is reciprocated by a hydraulic circuit operatively connected to a rotary positive-displacement pump.
  • thermodynamic apparatus such as, for example, absorption heat pump, in particular water-ammonia heat pump
  • the most critical component is the pump of the near-saturated solution which must have requirements of reliability, high head, capability of operating with a near-saturated liquid, and capability of operating under "dry" conditions, i.e. without liquid to be pumped.
  • the pumping devices for satisfying the requirements listed above are known; in any case, however, there are a lot of drawbacks due to several problems such as the extreme mechanical complexity with the result of high cost, the insufficient reliability, the poor capacity to the "dry” operation, and the high overall dimensions.
  • the invention seeks to provide a device of the type mentioned above having all of above requirements and being of reliable operation ad easy construction.
  • a pump operating under water-ammonia cooling cycles and generally comprising a diaphragm hydraulically operated with pressurized oil, two check valves for suction and delivery, respectively, and a cylindrical tank for stocking cooling liquid for starting.
  • a very similar pump has been used by ARKLA Company producing refrigerating absorption machines.
  • a hydraulically operated diaphragm pump is connected to a hydraulic circuit operated by a rotary pump in order to take advantage in the same machine of the operation of a diaphragm pump and a rotary pump which are, as known, cheaper, strong and reliable in the operation of a piston-connecting-rod-crank system used in the conventional diaphragm pumps.
  • a diaphragm pump In a diaphragm pump the pumping operation is executed by a strong diaphragm which divides the head of the pump in two sections, the chamber for the liquid with its suction and delivery valves and the chamber for the oil, so that the outer motor does not pump directly the liquid but an intermediate hydraulic fluid with the advantage of a sealed circuit for the liquid.
  • the device coupling the rotating system having unidirectional flow with the diaphragm pump having reciprocating flow is formed of a rotary distributor operating only in order to expose to the atmosphere the pipe in which the oil is flowing in the suction stroke of the diaphragm pump.
  • Such solution however, has the serious problem that the diaphragm of the pump can be lowered for the suction of the liquid to be pumped only if the suction pressure is higher than the atmospheric pressure (passive suction).
  • US-A-2 843500 discloses a pumping device comprising a reciprocating diaphragm pump and a rotary pump connected to said diaphragm pump through a distributor cyclically inverting the suction and delivery strokes so as to transmit said reciprocating motion to the diaphragm.
  • the rotary distributor does not exibit any high performance and does not reach high operating pressures. This is due to the lack of suitable sealing devices and an automatic slack taking up device installed between the moving components of the distributor.
  • a pumping device in particular for absorption heat pumps, comprising in combination a diaphragm pump, an oil stock tank, and a rotary pump coupled to a rotary distributor, wherein said rotary distributor consists of two metal disks for the automatic shim adjustment of the wear clearance hydraulically provided by the delivery pressure of the rotary pump.
  • Said rotary distributor connected to the rotary pump takes out oil from the tank and delivers it under pressure below the diaphragm, thus causing the liquid above the diaphragm to be pumped, and then sucks it back to the tank with the resulting suction stroke of the liquid above the diaphragm.
  • connection between oil tank and the suction valve of the rotary pump allows a vacuum suction stroke to be provided so that the diaphragm pump may operate even if the liquid to be sucked is at a lower pressure than the atmospheric pressure, as may be the case with a liquid having a low boiling point. Thanks to the automatic shim adjustment of the wear clearance, this pumping device is able to operate at high pressure without sealing problems.
  • Figs. 1 and la show schematically the operation of the device during the delivery and suction strokes of the liquid to be pumped, respectively.
  • Figs. 2 and 2a show the whole assembly during the strokes mentioned above.
  • Fig. 3 shows a detail of the reducer-distributor assembly in partial section along an axial plane.
  • Fig. 4 is a graphic comparing the absorbed power and the instant flow rate of a conventional alternative connecting-rod-crank pump with those of a reciprocated diaphragm pump according to the present invention.
  • the device includes a diaphragm pump 10 located in the pipes of delivery 11 and suction 12 of the liquid to be pumped which are connected to the upper room 13 of said pump above the elastic diaphragm 14.
  • a pipe 16 is connected on one end to the oil-containing tank 17 and on the other end to the lower room 15 of pump 10.
  • Rotary pump 18 is inserted in pipe 16 and connected to a rotary distributor 19 which is provided with two curved, slantwise disposed rooms 20 and 21 defining two different flow passageways A,B and C,D.
  • the oil taken out from tank 17 flows through pipe 16 and the passageways in the directions A-B and C-D and is fed to lower room 15 of pump 10.
  • Diaphragm 14 is pushed upwards so as to cause the liquid to be pumped to pipe 11.
  • the rotary distributor 19 When the rotary distributor 19 is in the position of Fig. 1a the oil flows in the directions C-D and A-B to tank 17, the diaphragm 14 is lowered, and the liquid to be pumped is sucked to pipe 12.
  • tank 17 is sealed and provided with dip stick 34, and includes rotary pump 18 whose output shaft drives distributor 19. The operation is similar to that described above; in Fig. 2 there is shown the delivery stroke with the diaphragm 14 of pump 10 pushed downwards.
  • a safety valve 23 is provided on the delivery side of rotary pump 18.
  • the reducer-distributor assembly may be formed by one compact piece shown in detail in Fig. 3.
  • Rotary distributor 19 provided with the passageways for the flow and the downflow of the oil is rotated through gear reduction unit 22 comprising gear wheel 24 and worm screw 25.
  • gear reduction unit 22 is secured directly to valve casing 26 and is connected to disk 19 through stem 27 which is in turn supported to distribution flange 28 by ball bearing 29.
  • Two sealing 0-rings indicated at 30 are placed between stem 27 and valve casing 26.
  • Four pipe fittings of the oil pipes connected to the four already described passageways A-B-C-D are secured to distribution flange 28.
  • An 0-ring indicated at 31 seals the distribution flange 28 to valve casing 26, while the oil pressure onto the disk seals the plane of rotary disk 19 to the plane of distribution flange 28; the initial position of disk 19 contacting flange 28 is determined by rubber seal 32 having a suitable length so as to provide a preloading on the disk during the assembling.
  • a shim adjustment washer 33 has the function of avoiding that seal 32 is subjected to a torque moment during the operation of the valve.

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

Claims (7)

  1. Un dispositif de pompage du type comprenant un boîtier de pompe à diaphragme en va-et-vient (10) et une pompe rotative (18) reliée audit boîtier de pompe à diaphragme par l'intermédiaire d'un distributeur (19) inversant de manière cyclique les courses d'aspiration et de décharge de manière à transmettre ledit mouvement de va-et-vient au diaphragme (14), caractérisé en ce que ledit distributeur rotatif (19) se compose de deux disques métalliques (19, 28) pour le réglage automatique du calage du jeu d'usure fourni de manière hydraulique par la pression de décharge de la pompe rotative.
  2. Dispositif de pompage du type comprenant un boîtier de pompe à diaphragme en va-et-vient (10), une pompe rotative (18) et un distributeur rotatif (19) qui transmet ledit mouvement de va-et-vient, ladite pompe à diaphragme (10) étant actionnée par un circuit hydraulique formé d'un réservoir de stockage d'huile (17), ladite pompe rotative (18) étant placée entre le réservoir (17) et la chambre inférieure (15) du boîtier de pompe à diaphragme (10), et ledit distributeur rotatif présentant la fonction de décharger et d'aspirer ladite huile dans un mouvement de va-et-vient audit boîtier de pompe à diaphragme (10) de manière à assurer un mouvement de décharge et d'aspiration pulsé du liquide à pomper qui passe vers la chambre supérieure (13) dudit boîtier de pompe à diaphragme, ledit distributeur rotatif (19) se composant de deux disques métalliques (19, 28) pour le réglage automatique du calage du jeu d'usure fourni de manière hydraulique par la pression de décharge de la pompe rotative.
  3. Dispositif de pompage selon la revendication 1 ou 2, caractérisé en ce que la course d'aspiration du liquide à pomper est assistée par la pompe rotative (18), en permettant ainsi que soient pompés des liquides présentant une pression d'aspiration inférieure à la pression atmosphérique.
  4. Dispositif de pompage selon les revendications précédentes, caractérisé en ce que ledit distributeur rotatif (19) est actionné par l'intermédiaire d'un réducteur de vitesse (22) par la même tige d'entraînement (27) de la pompe rotative à déplacement positif (18).
  5. Dispositif de pompage selon les revendications précédentes, caractérisé en ce que l'ensemble mécanique comprenant la pompe à déplacement positif (18), le réducteur de vitesse (22) et le distributeur rotatif (19) est placé dans un réservoir étanche (17) contenant l'huile du circuit hydraulique actionnant le boîtier de pompe à diaphragme.
  6. Dispositif de pompage selon les revendications précédentes, caractérisé en ce que ledit distributeur rotatif (19) comprend une paire de chambres symétriques (20, 21) placées le long de secteurs circulaires opposés qui provoquent alternativement la décharge de l'huile vers le boîtier de pompe à diaphragme et le passage de l'huile depuis la pompe en retour vers le réservoir.
  7. Dispositif de pompage selon les revendications précédentes, caractérisé en ce que l'ensemble des éléments rotatifs est entraîné par un seul moteur (M) placé à l'extérieur dudit réservoir (17).
EP94830178A 1993-04-16 1994-04-15 Dispositif de pompage de liquides à l'aide d'une pompe à membrane actionnée par un circuit hydraulique Expired - Lifetime EP0627555B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM930239A IT1262358B (it) 1993-04-16 1993-04-16 Dispositivo per il pompaggio dei liquidi con pompa a membrana azionatada circuito idraulico.
ITRM930239 1993-04-16

Publications (2)

Publication Number Publication Date
EP0627555A1 EP0627555A1 (fr) 1994-12-07
EP0627555B1 true EP0627555B1 (fr) 1997-08-13

Family

ID=11401718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94830178A Expired - Lifetime EP0627555B1 (fr) 1993-04-16 1994-04-15 Dispositif de pompage de liquides à l'aide d'une pompe à membrane actionnée par un circuit hydraulique

Country Status (4)

Country Link
EP (1) EP0627555B1 (fr)
DE (1) DE69404899T2 (fr)
ES (1) ES2106487T3 (fr)
IT (1) IT1262358B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1297087B1 (it) * 1997-11-28 1999-08-03 Enea Ente Nuove Tec Dispositivo per il pompaggio di liquidi o aeriformi, con moto alternativo a doppio effetto ottenuto per via idraulica.
US6102673A (en) * 1998-03-27 2000-08-15 Hydril Company Subsea mud pump with reduced pulsation

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB681139A (en) * 1950-02-22 1952-10-15 Maurice Monoyer An improved hydraulic drive
US2843050A (en) * 1954-02-15 1958-07-15 Lyndus E Harper Diaphragm sludge or chemical pump
GB1323006A (en) * 1971-05-17 1973-07-11 British Gas Corp Apparatus for supplying water or other liquid other than oil at high pressure
US4523901A (en) * 1981-10-17 1985-06-18 Barmag Barmer Maschinenfabrick Ag Control apparatus for a positive displacement reciprocating pump

Also Published As

Publication number Publication date
EP0627555A1 (fr) 1994-12-07
ITRM930239A1 (it) 1994-10-16
ITRM930239A0 (it) 1993-04-16
DE69404899T2 (de) 1998-03-05
IT1262358B (it) 1996-06-19
DE69404899D1 (de) 1997-09-18
ES2106487T3 (es) 1997-11-01

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