EP0509185B1 - Feeding device for reciprocating piston pumps for liquids under saturation conditions - Google Patents

Feeding device for reciprocating piston pumps for liquids under saturation conditions Download PDF

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Publication number
EP0509185B1
EP0509185B1 EP19910830155 EP91830155A EP0509185B1 EP 0509185 B1 EP0509185 B1 EP 0509185B1 EP 19910830155 EP19910830155 EP 19910830155 EP 91830155 A EP91830155 A EP 91830155A EP 0509185 B1 EP0509185 B1 EP 0509185B1
Authority
EP
European Patent Office
Prior art keywords
liquid
feeding device
pumping chamber
closure member
suction
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
EP19910830155
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0509185A1 (en
Inventor
Giuseppe Corallo
Antonio Ciancia
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
Priority to ES91830155T priority Critical patent/ES2084142T3/es
Priority to DE1991614474 priority patent/DE69114474T2/de
Priority to EP19910830155 priority patent/EP0509185B1/en
Publication of EP0509185A1 publication Critical patent/EP0509185A1/en
Application granted granted Critical
Publication of EP0509185B1 publication Critical patent/EP0509185B1/en
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
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
    • F04B15/08—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure the liquids having low boiling points
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/102—Disc valves

Definitions

  • the present invention relates to an improvement in reciprocating pumps, in particular diaphragm pumps operating with liquids under saturation conditions as well as with the usual subcooled liquids as in the absorption heat pumps or refrigerators.
  • Such performance can be achieved by using both reciprocating and rotary displacement pumps; among the absorption heat pumps on the market the near saturated solution pumps are diaphragm reciprocating pumps because the latter can assure perfect tightness to the outside.
  • a very similar pump to the preceding one is used by the company Arkla manufacturing water-ammonia absorption refrigerators and selling components to the European manufacturers of absorption heat pumps.
  • Such a pump has check valves formed of metallic disks pushed by coil springs; this solution causes a pressure loss remarkable during the suction with consequent cavitation. For such reason the spring of the suction valve is very weak, and the pumping body has a very small dead volume which should allow the mixed liquid-steam phases to be pumped.
  • the company Bunders SA holds a patent for a pump which generates an overpressure in the suction liquid provided by the rotor acting as booster and delivers the liquid to the same operative pistons.
  • the overpressure effect with consequent subcooling of the liquid is doubtful so that the same authors of the invention suggest an external cooling as precautional measure.
  • the rotor and its bearings are lubricated by the same pumped liquid, which is a non-valid solution since said liquid is usually corrosive (ammonia, lithium bromide).
  • the company Stiebel Eltron (FRT) developped a near saturated solution gear pump for absorption heat pump operating with organic liquids which has a very simple structure but suffers from the same operation problems as that of the above mentioned Columbia Gas System Service Corp.
  • US-A-3083648 discloses an apparatus for pumping a volatile liquid comprising a reservoir of such liquid with a pumping chamber positioned in said reservoir, in which a reciprocable pumping element extends in the pump body and has an inner pumping end portion operable in said pumping chamber.
  • An inlet port is adjacent said pumping chamber, being provided with a valve biased by gravity to an open position to allow vapor formed in said chamber to flow to said reserium and a valve-controlled outlet passage from the pumping chamber is provided for liquid discharge.
  • the disadvantage connected to such equipment is that, in operation, liquefied gas has to be delivered from a supply source to the reservoir so as to maintain the liquid level in the reservoir above the upper end of the inlet valve assembly.
  • the present invention seeks to provide a feeding device for reciprocating pumps which besides the necessary characteristics of reliability, long life and low cost has also a wide range of applications with any type of pump, in particular diaphragm pumps designated to operate with liquids under saturation conditions.
  • a suction device comprising a tubular conduit having the upper end communicating with the tank of the liquid to be pumped, the lower end opening into the pumping chamber, and a gravity bowl valve disposed near the base of the conduit and formed of a floating body having the form of a spherical bowl cooperating with a conical, annular sealing seat formed in the conduit and resting under opened condition on a pierced washer so as to allow the liquid to pass by gravity from the tank to said chamber and any steam bubble to be returned in an ascending current flow to said tank so as to assure the optimum filling of the pumping chamber with a liquid which is essentially free of gas phase.
  • the suction stroke is executed by gravity filling (feeding) practically without pressure loss and then without vaporization.
  • the pump can also operate without hydraulic head regardless of the sub cooled or saturated condition of the liquid.
  • Such property can be exploited in the field of the absorption heat pump to avoid the necessary adjustment for maintaining a constant level of the liquid in the absorber which is the feeding tank of the pump. It is sufficient to slightly oversize the pump with respect to the maximum flow rate provided by the process in order that the absorber can be kept constantly empty due to the above mentioned feature.
  • the absorption heat pump is a thermodynamic system formed of at least seven basic components connected to one another so as to make a closed circuit comprising generator G, condenser C, evaporator E, absorber A, the near saturated solution pump PSR, and two laminar flow valves V1 and V2.
  • a liquid in this case a water-ammonia mixture
  • the effect of such cyclic process is the transmission of heat with an increasing of temperature at the cost of the primary energy, i.e. the fuel for the generator, and of the electric power for energizing the near saturated solution pump PSR.
  • Pump PSR operates in the cycle to transfer the solution near saturated with ammonia from the absorber (at low pressure) to the generator (at high pressure) so that it is one of the most critical component of the system in which the invention is embodied.
  • the conventional diaphragm pump (Fig. 2) consists of a body 1 in which a pumping chamber 2 is formed, a suction valve 3 and a delivery valve 4 for the liquid to be pumped, a diaphragm 5, a hydraulic chamber 6 filled with oil and formed in a proper body 7, and a piston 8 capable of reciprocating motion and driven by an electric motor not shown. Sealing members 9 are provided for preventing oil and the liquid to be pumped from leaking off.
  • the diaphragm pump of Fig. 2 executes a two-stroke pumping cycle, suction and delivery, such strokes being provided by two check valves, one for the suction, the other for the delivery.
  • Such valves are essentially of two types: spring-operated valve as in Fig. 2 and gravity valve as in Fig. 2A.
  • the pump with gravity valve must have a vertical suction stroke from the lower side so as to cause the liquid to fall down by gravity during the delivery stroke, while the pump with the spring-operated valve may assume any position.
  • the gravity valves are usually formed of balls resting on conical seats as shown in Fig. 2A, and less usually of other types of closure bodies. In such valves the liquid during the suction stroke keeps the closure body raised and then is subjected to a pressure loss increasing with the weight of the closure body.
  • the spring-operated valves are formed of a spherical closure body having the form of a plate or a bowl, as shown in Fig. 2, which is pushed against the seat by a spring. Also in this case a pressure loss during the suction stroke is provided as the liquid flowing through the valve has to overcome the force of the spring; the pressure loss may be reduced by using weak springs.
  • a pressure loss causes the saturated liquid to vaporize within the pumping chamber: if the volume of the steam is considerable, the operation of the pump is stopped because the steam cannot be compressed to the pressure that allows the delivery valve to be opened and further liquid cannot be let in during the subsequent suction stroke either, because the latter causes the liquid to further vaporize so that the requested pressure release opening the suction valve cannot be provided. Therefore the steam remains in the pumping chamber and cannot be let out with the consequence of an interruption of the pumping action.
  • the inventive step at the base of the present invention is that of filling the pumping chamber (suction stroke) with a liquid so as to practically avoid any pressure loss and any vaporization as already mentioned above.
  • the suction or feeding device (see also Figs. 4, 4A and 4B) is mounted so that the liquid to be pumped flows from the top to the bottom thereof.
  • Such device is formed of a body 10 with a conduit 11 having such a diameter as to allow at the same time the steam to flow from the bottom to the top of the conduit and the liquid to flow in the opposite direction, a closure member 12 having suitable form and weight such as to oppose a low resistance to the input flow and a much higher resistance to the reverse flow, a pierced rest washer 13 limitating the stroke of the closure member and having openings the size of which is such as to allow liquid and steam to flow together, and finally a sealing seat 14 formed in the body 10 above the washer 13.
  • the closure body 12 rests during the suction stroke on the rest washer 13 and allows the pumping liquid to fall down to chamber 2; in the delivery stroke the closure member 12 is pushed upwards so as to close the conical seat 14 during the whole pumping or delivery stroke.
  • the closure member does not move upwards and then the pump ejects the steam through the opened suction valve.
  • the pumping begins again as chamber 2 is filled with further liquid by gravity.
  • the pump features a feeding stroke or a filling by gravity rather than a real suction stroke.
  • the suction conduit 11 In order to blow off steam from the pumping chamber 2 the suction conduit 11 has a large diameter and extends vertically so that the steam bubbles can easily ascend to the tank of the liquid which is not thus prevented from falling down.
  • the cylindrical body 10 is made of stainless steel of which both the conical seat 14 and the closure member 12 having the form of a spherical bowl are also made.
  • the rest washer 13 consists of a ring provided with radial tabs (Figs. 4A and 4B).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP19910830155 1991-04-19 1991-04-19 Feeding device for reciprocating piston pumps for liquids under saturation conditions Expired - Lifetime EP0509185B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES91830155T ES2084142T3 (es) 1991-04-19 1991-04-19 Dispositivo de alimentacion para bombas aspirantes-impelentes de embolo para liquidos en condiciones de saturacion.
DE1991614474 DE69114474T2 (de) 1991-04-19 1991-04-19 Einführvorrichtung einer Kolbenpumpe für Saturationsflüssigkeiten.
EP19910830155 EP0509185B1 (en) 1991-04-19 1991-04-19 Feeding device for reciprocating piston pumps for liquids under saturation conditions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19910830155 EP0509185B1 (en) 1991-04-19 1991-04-19 Feeding device for reciprocating piston pumps for liquids under saturation conditions

Publications (2)

Publication Number Publication Date
EP0509185A1 EP0509185A1 (en) 1992-10-21
EP0509185B1 true EP0509185B1 (en) 1995-11-08

Family

ID=8208942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910830155 Expired - Lifetime EP0509185B1 (en) 1991-04-19 1991-04-19 Feeding device for reciprocating piston pumps for liquids under saturation conditions

Country Status (3)

Country Link
EP (1) EP0509185B1 (es)
DE (1) DE69114474T2 (es)
ES (1) ES2084142T3 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPP484398A0 (en) * 1998-07-24 1998-08-20 Orbital Engine Company (Australia) Proprietary Limited Engine fuel pump
IT1314757B1 (it) * 2000-06-30 2003-01-03 Cozzani Mario S R L Valvola, in particolare per compressori, con otturatore a profilosagomato
IT202100021521A1 (it) * 2021-08-09 2023-02-09 Ariston S P A Sistema di pompaggio per circuiti a pompe di calore ad assorbimento

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR496324A (fr) * 1917-11-13 1919-11-04 Karl Dellgren Pompe à liquide
FR895290A (fr) * 1942-06-26 1945-01-19 Dispositif amortisseur des chocs de soupapes, applicable notamment aux soupapes des pompes hydrauliques à piston
FR1224446A (fr) * 1958-05-10 1960-06-23 Soupapes avec siège en caoutchouc ou matière analogue, destinées aux pompes et en particulier à celles pour l'alimentation en combustible
US3083648A (en) * 1959-02-25 1963-04-02 Superior Air Products Co Liquefied gas pump
DE1453465A1 (de) * 1963-03-12 1969-02-06 Huels Chemische Werke Ag Verfahren zum Foerdern und Entlueften unter vermindertem Druck stehender und/oder beim Ansaugen zum Ausgasen neigender pumpfaehiger fluessiger Medien mittels oszillierender Verdraengerpumpen und Vorrichtung zur Durchfuehrung des Verfahrens

Also Published As

Publication number Publication date
EP0509185A1 (en) 1992-10-21
DE69114474T2 (de) 1996-08-08
DE69114474D1 (de) 1995-12-14
ES2084142T3 (es) 1996-05-01

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