EP0201377B1 - Pompe autoamorçante à hydroéjecteur - Google Patents

Pompe autoamorçante à hydroéjecteur Download PDF

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Publication number
EP0201377B1
EP0201377B1 EP19860400729 EP86400729A EP0201377B1 EP 0201377 B1 EP0201377 B1 EP 0201377B1 EP 19860400729 EP19860400729 EP 19860400729 EP 86400729 A EP86400729 A EP 86400729A EP 0201377 B1 EP0201377 B1 EP 0201377B1
Authority
EP
European Patent Office
Prior art keywords
pump
orifice
suction
nozzle
hydro
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
EP19860400729
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0201377A1 (fr
Inventor
Roland Brunel
Hervé Brunet
Jean-Claude Pasquet
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.)
Wilo Salmson France SAS
Original Assignee
Pompes Salmson SAS
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 Pompes Salmson SAS filed Critical Pompes Salmson SAS
Publication of EP0201377A1 publication Critical patent/EP0201377A1/fr
Application granted granted Critical
Publication of EP0201377B1 publication Critical patent/EP0201377B1/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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • F04D9/06—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock of jet type

Definitions

  • the invention relates to a centrifugal pump comprising a pump body enclosing an impeller and means for priming this pump in the form of a hydro-ejector constituted by a nozzle and a venturi supplied by a reservoir priming.
  • Pumps of this type include a pump body inside which rotates an impeller, also called an impeller, which, when rotated at high speed, projects the liquid towards a discharge orifice thanks to the centrifugal force generated at its periphery.
  • the liquid enters the interior of the pump body through a suction port, which brings it into the central area of the impeller. It comes out through a discharge opening.
  • the impeller is driven by a motor most often located outside the pump body.
  • the most frequently used motors are electric.
  • This type of pump implies that starting operations are carried out priming operations, that is to say that the suction pipe and the pump body must be filled with liquid to allow the operation of the pump and d '' avoid dry rotation of the rotor assembly and the shaft sealing system.
  • Such pumps comprise, in the pump body, a reservoir which communicates on the one hand with the peripheral zone of the impeller, and on the other hand with the central zone via the hydro-ejector.
  • the hydro-ejector is constituted on the one hand by a nozzle which puts the reservoir in communication with the suction zone and on the other hand by a venturi, that is to say a tube which has a throttle.
  • the inlet of the venturi is opposite the outlet of the nozzle and its outlet is opposite the central zone of the wheel.
  • the nozzle and the venturi are produced independently of the pump body and are then placed inside. This subsequent installation involves the creation of sealed connections to prevent liquid from passing directly from the priming tank to the central zone of the impeller without having passed through the venturi. Indeed, in this case, the depression would not be created and the priming could not take place.
  • FR-A-1 222 755 describes centrifugal pumps with priming by a hydro-ejector which can be switched off after priming of the pump. This deactivation can be controlled manually or automatically by any mechanical, hydraulic, pneumatic, electrical or other means and in particular by the pressure supplied by the pump when the latter is primed.
  • the purpose of the centrifugal pump according to the present invention is to simplify the hydro-ejection circuit by placing it in a vertical plane and by directly connecting the priming tank placed above the impeller, on the one hand to a discharge orifice and, on the other hand via an orifice, to the narrowed suction channel forming a venturi.
  • the assembly of the pump and the hydro-ejector obtained is thus more compact and more manageable in order to allow a user to transport the pump manually with the handle, if necessary, and to quickly choose to operate with the hydro -ejector in permanent service to benefit from a significant head height or else to operate the pump, after priming, with the hydro-ejector out of service to then benefit from good efficiency.
  • the pump body contains, in the lower part, the impeller and, in the upper part, the priming tank which is connected, at its lower part, to the peripheral part of the impeller by a opening and, at its upper part, to a discharge port of the pump, an orifice connecting, via the nozzle, the reservoir to a suction zone extended by a supply channel and being capable of being opened or closed and the pump body is made in a single piece molded, grouping the suction area above which is a suction port of the pump, the liquid supply channel from the suction port and from the nozzle to the central suction part of the impeller, the supply channel having a reduced section compared to that of the suction zone to determine the venturi before the entry of the impeller, so that the suction of the liquid through the suction opening and the discharge of the liquid through the discharge orifice takes place at the upper part of the pump body while the circulation of the hydro-ejector develops vertically in a compact structure formed at the upper and lateral part of the pump body monobloc
  • the nozzle is formed in a part acting as a shutter and which is integral with a control member, this part being engaged in an orifice of the pump body and held in place by bearing means allowing it to rotate in order to free or close off the orifice connecting the reservoir to the suction zone, so that the nozzle is brought opposite the orifice for its commissioning, following a rotational movement of the part caused by the control member.
  • a shutter control member is associated with a sensor of the outlet pressure of the pump capable of causing, by means of an automatic controlled control, the automatic return to the nozzle activation position when said outlet pressure reaches a determined lower threshold.
  • the total head (HMT) of the low flow pump is important.
  • the total head of a pump is the pressure difference between the outlet and the inlet of the pump.
  • Decommissioning the hydro-ejector is, on the other hand, advantageous for use in watering, the flow rates for the same suction height being higher and the power consumption lower. This feature is very important, because this mode can be used for example for emptying flooded areas. In this case, the same quantity of liquid is discharged more quickly than when the hydro-ejector is kept in service.
  • This pump comprises a pump body 1 which contains a suction zone 11 above which is a suction orifice 12.
  • the pump body has a zone 13 which encloses the impeller and a priming reservoir 14.
  • a discharge orifice 15 places the priming tank in communication with the outside.
  • a plug 16 allows, when it is removed, the filling of the priming tank. This cap is located above said tank.
  • the pump is dried using a drain plug 17, located in the lower part of zone 13 containing the impeller.
  • the filling and draining plugs 16, 17 are screwed.
  • a device here in the form of a lever 18, allows the hydro-ejector to be turned on or off.
  • the pump body 1 is produced in a single block which notably contains the venturi.
  • the suction zone 11 is extended by a channel 19 which brings the liquid to the zone 13 enclosing the impeller.
  • the channel 19 has a section narrowed relative to that of the suction zone, which acts as a venturi.
  • the liquid passes from the priming reservoir 14 to the suction zone 11, upstream of the channel 19, via a nozzle not shown in this figure. A hydro-ejector was thus formed.
  • the channel 19 is bent and the suction zone 11 is contiguous to the reservoir 14. This arrangement avoids having to produce complex shapes and to insert a tube between the reservoir 14 and the suction area 11.
  • An engine block 2 contains a motor for driving the wheel.
  • the motor is electric.
  • the motor unit 2 is fixed to the pump body 1 by screws 22, 23.
  • a handle 3 is shown. It allows the pump to be carried.
  • FIG. 1 shows, in section, the interior of the pump of the invention.
  • the suction zone 11 and the suction orifice 12 Inside the pump body 1 are the suction zone 11 and the suction orifice 12, the channel 19 for supplying liquid to the zone 13 in which the impeller 40 is enclosed.
  • a hydraulic seal 41 is provided to limit leaks between the wheel and the outlet of the channel 19 for supplying liquid.
  • a seal 42 prevents the liquid from escaping from the pump body at the level of the passage of the shaft 25 connecting the motor 24 to the impeller 40.
  • the liquid passes from the peripheral part of the wheel 40 to the priming reservoir 14 through an orifice 43.
  • An orifice 44 connects the reservoir 14 to the suction zone 11 of the pump body.
  • an additional part 60 is shown near this latter orifice 44.
  • the nozzle 61 for ejecting the liquid into the venturi is produced in this additional part 60.
  • the part 60 can rotate so that the nozzle 61 comes opposite the orifice 44, or else that the orifice 44 is obstructed. This piece therefore acts as a shutter.
  • Figure 3 shows section AA of Figure 2.
  • An assembly comprising the handle 18 and the part 60 is engaged in an orifice of the pump body and is held in place by appropriate means which allow it to rotate freely to obstruct or release the nozzle.
  • the nozzle therefore forms part of an assembly which is attached to the pump body 1.
  • the nozzle is produced in the mass of the pump body, and that its obturation is carried out using a needle or any other part, controlled by a lever placed outside.
  • the pump body 1 is made in foundry.
  • the nozzle 61 is therefore part or not, depending on the embodiment chosen, of the foundry.
  • the control of the shutter is manual.
  • An automatic control is provided subject to the outlet pressure of the pump, so that, when this pressure decreases after the nozzle has been closed, a return to the open position is ensured.
  • a pressure sensor is placed at the pump outlet, and the control is triggered when the pressure reaches a determined lower threshold.
  • this possibility prevents the user from forgetting to return to the priming position after a voluntary stop of the pump.
  • FIG. 4 shows for the same pump two curves of total head (HMT) as a function of the flow rate (Q) in steady state.
  • the total head (HMT) is the pressure difference expressed in meters (m) of liquid, between the outlet and the inlet of the pump.
  • the pump of the invention therefore has variable performance or output depending on whether or not the hydro-ejector is used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19860400729 1985-04-09 1986-04-04 Pompe autoamorçante à hydroéjecteur Expired - Lifetime EP0201377B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8505334A FR2580036B1 (enrdf_load_stackoverflow) 1985-04-09 1985-04-09
FR8505334 1985-04-09

Publications (2)

Publication Number Publication Date
EP0201377A1 EP0201377A1 (fr) 1986-12-17
EP0201377B1 true EP0201377B1 (fr) 1990-12-27

Family

ID=9318065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860400729 Expired - Lifetime EP0201377B1 (fr) 1985-04-09 1986-04-04 Pompe autoamorçante à hydroéjecteur

Country Status (3)

Country Link
EP (1) EP0201377B1 (enrdf_load_stackoverflow)
DE (1) DE3676551D1 (enrdf_load_stackoverflow)
FR (1) FR2580036B1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1253353B (it) * 1991-09-27 1995-07-25 Foras Pumps Corpo pompa ad anello liquido nonche' metodo di realizzazione di tale corpo.
RU2175406C1 (ru) * 2000-05-26 2001-10-27 Несытов Евгений Константинович Центробежный самовсасывающий насос
RU2272935C1 (ru) * 2004-07-16 2006-03-27 Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный технологический институт (технический университет)" Самовсасывающая насосная установка

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR463338A (fr) * 1913-10-07 1914-02-19 Camille Durey Amorceur automatique pour pompes aspirantes et foulantes
US2330498A (en) * 1941-09-29 1943-09-28 Coventry Climax Eng Ltd Engine-driven centrifugal pump
US2457388A (en) * 1945-06-27 1948-12-28 Flint & Walling Mfg Co Inc Injector-impeller pump
FR1222755A (fr) * 1959-01-22 1960-06-13 Perfectionnement aux pompes centrifuges à amorçage par hydro-éjecteur
US3185101A (en) * 1963-03-06 1965-05-25 Crane Co Pump

Also Published As

Publication number Publication date
DE3676551D1 (de) 1991-02-07
EP0201377A1 (fr) 1986-12-17
FR2580036B1 (enrdf_load_stackoverflow) 1989-05-26
FR2580036A1 (enrdf_load_stackoverflow) 1986-10-10

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