EP2037125B1 - Pompe à jet centrifuge à amorçage automatique - Google Patents

Pompe à jet centrifuge à amorçage automatique Download PDF

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Publication number
EP2037125B1
EP2037125B1 EP08164172A EP08164172A EP2037125B1 EP 2037125 B1 EP2037125 B1 EP 2037125B1 EP 08164172 A EP08164172 A EP 08164172A EP 08164172 A EP08164172 A EP 08164172A EP 2037125 B1 EP2037125 B1 EP 2037125B1
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EP
European Patent Office
Prior art keywords
nozzle
pump according
partition
impeller
pump
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.)
Not-in-force
Application number
EP08164172A
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German (de)
English (en)
Other versions
EP2037125A3 (fr
EP2037125A2 (fr
Inventor
Francesco Sinico
Anders Lykkegaard Moller
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.)
DAB Pumps SpA
Original Assignee
DAB Pumps SpA
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Filing date
Publication date
Application filed by DAB Pumps SpA filed Critical DAB Pumps SpA
Publication of EP2037125A2 publication Critical patent/EP2037125A2/fr
Publication of EP2037125A3 publication Critical patent/EP2037125A3/fr
Application granted granted Critical
Publication of EP2037125B1 publication Critical patent/EP2037125B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
    • 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 present invention relates to a self-priming centrifugal jet pump.
  • Self-priming centrifugal jet pumps are particularly suitable for supplying water in domestic systems, small-scale farming, gardening and in general where self-priming is necessary.
  • These self-priming pumps generally comprise, within the pump body, which is coupled by means of a flange to the dome that contains the electric motor drive, an ejector designed to generate the suction required to prime the liquid to be pumped; such ejector is arranged coaxially and adjacent to the impeller suction port and is constituted by a Venturi tube preceded by a nozzle, which are arranged coaxially and form between them an annular suction orifice.
  • the pump body is constituted by a cup-shaped element with an intake port, whose axis is parallel to the rotation axis of the impeller, and a delivery port, whose axis is perpendicular to the axis of the intake port.
  • Such cup-shaped element has a depth, in the direction of the axis of the impeller, such as to contain a Venturi duct capable of generating the desired suction.
  • Coaxiality of the nozzle, the Venturi duct and the impeller determines, for the pump body, a space occupation which makes it difficult or impossible to install the pump if the installation site designed to receive it is particularly tight and difficult to access.
  • US-A-2380924 discloses a self-priming centrifugal jet pump as defined in the preamble of claim 1.
  • the aim of the present invention is to provide a self-priming centrifugal jet pump that is more compact than known pumps having a similar performance.
  • an object of the present invention is to provide a self-priming pump that has a simplified structure and therefore can be assembled quickly and easily.
  • Another object of the present invention is to provide a self-priming centrifugal jet pump that can be manufactured cheaply with known systems and technologies.
  • a self-priming centrifugal jet pump according to the invention is generally designated, in its first embodiment, by the reference numeral 10.
  • the self-priming pump 10 comprises, within a pump body 11, an ejector designed to generate the suction required to prime the liquid to be pumped.
  • Such ejector comprises a Venturi duct 12, which is contiguous to the inlet of an impeller 13 of the pump 10 and is preceded by a nozzle 14; the Venturi duct 12 and the nozzle 14 are aligned and form between them two facing suction orifices 15 for the fluid that rises from the associated suction tube, not shown in the figures for the sake of simplicity, which is connected to a suction port 16 of the pump body 11.
  • the particularity of the invention resides in that the nozzle 14 and the Venturi duct 12 lie on a plane of arrangement which is substantially perpendicular to a rotation axis 17 of the impeller 13.
  • the pump body 11 comprises an outer enclosure constituted by a flange 18, which is fixed at one end to a motor drive 19 of the pump 10 and at the opposite end to a housing 20, which is substantially cylindrical and on which the suction port 16 and a delivery port 21 are formed.
  • the Venturi duct 12 and the nozzle 14 are formed on a diffuser 22 that surrounds the impeller 13.
  • the Venturi duct 12 is constituted by two mutually opposite walls 23, which diverge in a radial direction from the outside inward and protrude toward the axis 17 of the impeller 13.
  • the walls 23 extend substantially radially between two first symmetrical curved walls 24, which have a substantially C-shaped transverse cross-section, and a second curved wall 25, which forms centrally a cylindrical tubular portion whose axis is parallel to the axis 17 of the impeller 13, for conveying the aspirated fluid toward an inlet 26 of the impeller 13.
  • the first curved walls 24 protrude from the diverging walls 23; the free ends of the two first curved walls 24 form, in a radial direction, the nozzle 14 that precedes the Venturi duct 12.
  • Each one of the first curved walls 24 forms, in the direction of the axis 17 of the impeller 13, a suction passage 27 for the fluid that enters the body 11 through the suction port 16.
  • the diverging walls 23, the first curved walls 24 and the second curved wall 25 are joined in an inlet (26), which in turn is provided monolithically with the diffuser 22.
  • the inlet 26 is partly surrounded by an air separation partition 31, which is open downward onto an internal chamber 29 of the body 11.
  • the partition 31 also forms rising ducts 32 for the fluid which, by recirculating in the body 11 and being pushed in the nozzle 14 and in the Venturi duct 12, determines the partial vacuum that allows suction through the orifices 15.
  • the rising ducts 32 have a cross-section that tapers from the bottom upward by way of the inclination of two central portions 32a, which reduce the height of the rising duct 32.
  • the diffuser 22 that surrounds the impeller 13 has radial protrusions 33, inside each of which there is a contoured passage 34 for conveying the fluid toward the delivery port 21.
  • the diffuser 22 is inserted in the housing 20, which is provided internally with grooves 36 and 37 which are contoured to accommodate the edges of the inlet 26 and of the partition 31 respectively, so as to create substantially sealed passages through which the flowing fluid cannot seep and recirculate.
  • Venturi duct 12 and the nozzle 14 are provided so that the aspirated fluid follows a path which is substantially perpendicular to the axis 17 of the impeller 13 instead of being parallel to the axis 17, as in known types of pump.
  • the housing 20 and the diffuser 22 which supports, monolithically therewith, also the partition 31 and the inlet 26, while at least four components are generally necessary in known types of pump: the housing 20, the nozzle 14, the Venturi duct 12 and the air separation partition 31.
  • the assembly of just two components is far cheaper in terms of labor than the assembly of at least four components.
  • the housing 20 and the diffuser 22 can be provided by molding plastic material, therefore with very low production costs.
  • the diffuser 122 supports a Venturi duct 112, which is substantially shaped like a spiral, as clearly shown also in Figure 5 .
  • the diverging walls 123 extend substantially concentrically from the first curved walls 124 to the second curved wall 125, which defines the portion for conveyance toward the impeller 113.
  • each of the first curved walls 124 forms, in the direction of the axis of the impeller 113, a suction passage 127 for the fluid that enters the body 111 by means of the suction port 116.
  • the air separation partition 131 is extended substantially upward to the side of the second curved wall 125; from there, parallel to the partition 131, a portion 141 extends which, together with the partition 131, defines the rising duct 132.
  • the ends of the partition 131 and of the portion 141 converge monolithically with the first curved walls 124 and form the nozzle 114.
  • Figure 5 exemplifies by means of light-colored arrows the behavior of the recirculating fluid that rises from the rising duct 132 toward the nozzle 114, and the dark arrows exemplify the behavior of the fluid that is aspirated and enters the pump body 111.
  • FIGS. 6 and 7 illustrate a third embodiment of the pump according to the invention, generally designated by the reference numeral 210.
  • first internal wall 226, which in turn comprises monolithically the two diverging walls 223 that form a Venturi duct 212, which has a curved profile and extends upward from below, and the central curved wall 225, and a partition 231, which surrounds the first wall 226, extending substantially along the perimeter of the diffuser 222;
  • the two ends 231a and 231b of the partition 231 are contoured so as to arrange themselves side-by-side to form the nozzle 214, proximate to where the ends of the diverging walls 223 define the inlet of the Venturi duct 212 and face the nozzle 214 so as to form the suction orifices 215.
  • the flow enters from the suction port 216, not at the nozzle 214 but in a region 240 between the partition 231 and the central curved wall 225, on the opposite side, with respect to the axis 217 of the impeller 213, of the nozzle 214.
  • Figure 7 exemplifies by means of dark arrows the behavior of the aspirated fluid that enters the pump body 211.
  • FIGS 8 and 9 illustrate a fourth embodiment of the pump according to the invention, generally designated by the reference numeral 310.
  • first internal wall 326 which in turn comprises monolithically the two diverging walls 323 that form a substantially straight Venturi duct 312 which extends upward from below, and the central curved wall 325, and a partition 331, which surrounds the first wall 326, which lies substantially along the perimeter of the diffuser 322; the two ends 331a and 331b of the partition 331 are contoured so as to be arranged side-by-side to form the nozzle 314, proximate to where the ends of the diverging walls 323 define the inlet of the Venturi duct 312 and face the nozzle 314 so as to form the suction orifices 315.
  • the flow enters from the suction port 316, not at the nozzle 314 but in a region 340 between the partition 331 and the central curved wall 325, on the opposite side, with respect to the axis 317 of the impeller 313, of the nozzle 314.
  • Figure 9 illustrates, by way of example, by means of dark arrows the behavior of the aspirated fluid that enters the pump body 311.
  • the present invention provides a self-priming centrifugal jet pump that is smaller than known pumps having a similar performance and therefore is easier to position even in tight spaces in which it would be unlikely to be able to install a known type of pump.
  • the invention has provided a pump that has a simplified structure and therefore can be assembled easily and rapidly.
  • the invention has provided a self-priming pump whose performance is not inferior to similar pumps of the known type.
  • the present invention provides a self-priming centrifugal jet pump that can be manufactured cheaply with known systems and technologies.
  • the materials used may be any according to requirements and to the state of the art.

Claims (18)

  1. Une pompe à jet centrifuge à amorçage automatique (10), comprenant, dans le corps de la pompe (11), un éjecteur conçu pour générer l'aspiration nécessaire pour amorcer le liquide à pomper, ledit éjecteur comprenait un canal Venturi (12), qui est contigu à l'entrée de la roue à aubes (13) de la pompe (10), précédé par une buse (14), le canal Venturi (12) et la buse (14) étant alignés et formant entre eux au moins un orifice d'aspiration (15), ladite buse (14) et ledit canal Venturi (12) étant situés à angle droit par rapport à l'axe de rotation (17) de la roue à aubes (13), caractérisée en ce que ledit canal Venturi (12) est constitué de deux parois mutuellement opposées (23), qui divergent dans une direction radiale de l'extérieur vers l'intérieur, font saillie vers l'axe (17) de la roue à aubes (13) et s'étendent substantiellement dans une direction radiale entre deux premières parois incurvées (24), qui sont symétriques et présentent une forme en C en coupe transversale, et une seconde paroi incurvée (25), qui forme, au centre, une partie tubulaire cylindrique, dont l'axe est parallèle à l'axe (17) de la roue à aubes (13), pour l'acheminement du liquide aspiré vers l'entrée (26) de la roue à aubes (13), ladite première parois incurvée (24) s'étendant depuis les parois divergentes (23) avec un tel contour que leurs extrémités libres forment dans une direction radiale, la buse (14) qui précède le canal Venturi (12), tandis que chacune desdites parois incurvées (24), dans la direction de l'axe (17) de la roue à aubes (13), forme un passage d'aspiration (27) pour le fluide qui pénètre dans le corps (11) au moyen de orifice d'aspiration (16).
  2. La pompe selon la revendication 1, caractérisée en ce que le corps de pompe (11) comprend un boîtier externe constitué par une bride (18), qui est fixée à une extrémité du moteur d'entraînement (19) de la pompe (10) et à la extrémité opposée à un logement substantiellement cylindrique (20), sur lequel l'orifices d'aspiration (16) et un orifice de refoulement (21) sont présents, à l'intérieur du boîtier (20) le canal Venturi (12) et la buse (14) étant présents sur un diffuseur (22) qui entoure la roue à aubes (13).
  3. La pompe selon la revendication 1, caractérisée en ce que le logement (20) comporte deux orifices (28), dont chacun fait face à l'une des deux parois incurvés (25), qui relient le port d'aspiration (16) au canal Venturi (12).
  4. La pompe selon la revendication 2, caractérisée en ce que les parois divergentes (23), la première paroi incurvée (24) et la seconde paroi incurvée (25) sont réunies au niveau de l'entrée (26), qui à son tour est conçue monobloc avec le diffuseur (22).
  5. La pompe selon la revendication 4, caractérisée en ce que ladite entrée (26) est partiellement entourée par une cloison de séparation d'air (31), qui est ouverte vers le bas vers la chambre interne (29) du corps de pompe (11).
  6. La pompe selon la revendication 5, caractérisée en ce que ladite cloison (31) forme des conduits montants (32) pour le fluide qui, par recirculation dans le corps (11) et introduction sous pression dans la buse (14) et dans le canal Venturi (12), détermine le vide partiel qui permet d'aspiration à travers les orifices (15).
  7. La pompe selon la revendication précédente, caractérisée en ce que les conduits montants (32) ont une section qui se rétrécit de bas en haut par le biais de l'inclinaison des deux parties centrales (32a) qui permettent de réduire la hauteur du conduit montant (32).
  8. La pompe selon l'une ou plusieurs des revendications précédentes 2 ou 4 à 7, caractérisée en ce que ledit diffuseur (22) qui entoure la roue à aubes (13) présente des saillies radiales (33), à l'intérieur de chacune desquelles se trouve un passage profilé (34) pour le transport du fluide vers le port de refoulement (21).
  9. La pompe selon l'une ou plusieurs des revendications précédentes 2 ou 4 à 8, caractérisée en ce que ledit diffuseur (22) est inséré dans le boîtier (20), muni à l'intérieur de rainures profilées (36, 37) pour recevoir les bords de l'entrée (26) et de la cloison (31), de manière à créer des passages substantiellement étanches à partir desquels le fluide les traversant ne peut pas s'infiltrer et recirculater.
  10. La pompe selon l'une ou plusieurs des revendications précédentes 2 où 4 à 9, caractérisée en ce que ledit boîtier (20) et ledit diffuseur (22) sont réalisés par moulage de matière plastique.
  11. La pompe selon une ou plusieurs des revendications 2 ou 4 à 10.
    caractérisée en ce que ledit diffuseur (122) présente un conduit Venturi (112) substantiellement en forme de spirale.
  12. La pompe selon la revendication 11, caractérisée en ce que lesdites parois divergentes (123) s'étendent substantiellement de façon concentrique à partir des premières parois incurvées (124) à la seconde paroi incurvée (125), qui définit la partie pour le transport vers la roue à aubes (113).
  13. La pompe selon la revendication 12, caractérisée en ce que la cloison de séparation d'air (131) s'étend substantiellement de bas en haut vers le côté de la seconde paroi incurvée (125), une partie (141) s'étendant depuis ladite deuxième paroi incurvée (125), parallèle à la cloison (131), et formant le conduit montant (132) avec la cloison (131).
  14. La pompe selon la revendication 13, caractérisée en ce que les extrémités de la cloison (131) et de la partie (141) convergent de façon monobloc avec les premières parois incurvées (124) et forment la buse (114).
  15. La pompe selon les revendications 2 ou 4 à 10, caractérisée en ce que le diffuseur (222) présente une première paroi interne (226), qui comprend à son tour de façon monobloc les deux parois divergentes (223) qui définissent un canal Venturi (212) qui présente un profil incurvé et s'étend de bas en haut, et la paroi centrale incurvée (225), et une cloison (231), qui entoure la première paroi (226), s'étendant substantiellement le long du périmètre du diffuseur (222); les deux extrémités (23 la, 231b) de la cloison (231) sont profilées de manière à être disposées côte à côte pour former la buse (214), à proximité de l'endroit où les extrémités des parois divergentes (223) définissent l'entrée du canal Venturi (212) et font face à la buse (214) afin de définir les orifices d'aspiration (215).
  16. La pompe selon la revendication 15, caractérisée en ce que l'écoulement pénètre par l'orifice d'aspiration (216) dans une zone (240) entre la cloison (231) et la paroi centrale incurvée (225), sur le côté opposé de la buse (214) par rapport à l'axe (217) de la roue à aubes (213).
  17. La pompe selon les revendications 2 ou 4 à 10, caractérisée en ce que le diffuseur (322) présente une première paroi interne (326), qui comprend à son tour de façon monobloc les deux parois divergentes (323) qui forment un canal Venturi substantiellement rectiligne (312) qui s'étend de bas en haut, et la paroi centrale incurvée (325), et une cloison (331), qui entoure la première paroi (326), s'étendant substantiellement le long du périmètre du diffuseur (322), les deux extrémités (331a, 331b) de la cloison (331) sont profilées de manière à se mettre côte à côte pour former la buse (314), à proximité de l'endroit où les extrémités des parois divergentes (323) forment l'entrée du canal Venturi (312) et face à la buse (314) de manière à définir les orifices d'aspiration (315).
  18. La pompe selon la revendication 17, caractérisée en ce que l'écoulement pénétré à travers l'orifice d'aspiration (316) dans une zone (340) entre la cloison (331) et la paroi centrale incurvée (325), sur le côté opposé de la buse (314) par rapport à l'axe (317) de la roue à aubes (313).
EP08164172A 2007-09-14 2008-09-11 Pompe à jet centrifuge à amorçage automatique Not-in-force EP2037125B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000294A ITPD20070294A1 (it) 2007-09-14 2007-09-14 Pompa centrifuga autoadescante di tipo jet

Publications (3)

Publication Number Publication Date
EP2037125A2 EP2037125A2 (fr) 2009-03-18
EP2037125A3 EP2037125A3 (fr) 2010-05-26
EP2037125B1 true EP2037125B1 (fr) 2011-07-27

Family

ID=39864777

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08164172A Not-in-force EP2037125B1 (fr) 2007-09-14 2008-09-11 Pompe à jet centrifuge à amorçage automatique

Country Status (4)

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EP (1) EP2037125B1 (fr)
AT (1) ATE518060T1 (fr)
ES (1) ES2369208T3 (fr)
IT (1) ITPD20070294A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9695826B1 (en) 2012-06-28 2017-07-04 James Harmon Pitot tube pump and related methods
FR3020386B1 (fr) * 2014-04-25 2017-08-18 Victor Jean Ballestra Dispositif d'evacuation sanitaire pour l'evacuation des eaux d'une douche
CN104895851A (zh) * 2015-05-12 2015-09-09 川源(中国)机械有限公司 一种自吸式污水离心泵的除污装置
CN107269544A (zh) * 2017-08-16 2017-10-20 利欧集团浙江泵业有限公司 一种射流自吸泵
CN107740782A (zh) * 2017-11-14 2018-02-27 利欧集团浙江泵业有限公司 一种高效喷射泵
CN114992133B (zh) * 2022-06-09 2023-05-12 宁波君禾智能科技有限公司 一种自吸式喷射泵
CN116291960B (zh) * 2023-04-23 2023-11-14 北京星河动力装备科技有限公司 集气结构、涡轮泵以及火箭发动机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2380924A (en) 1943-10-26 1945-08-07 Berkeley Pump Company Self-priming pumping system
US2433021A (en) 1945-03-09 1947-12-23 Jacobsen Mfg Co Shallow well self-priming pump
US2578322A (en) 1946-10-02 1951-12-11 Deming Co Pump
ES2006285A6 (es) 1987-12-28 1989-04-16 Bombas Elec Tricas S A Boelsa Bomba centrifuga.

Also Published As

Publication number Publication date
EP2037125A3 (fr) 2010-05-26
EP2037125A2 (fr) 2009-03-18
ATE518060T1 (de) 2011-08-15
ITPD20070294A1 (it) 2009-03-15
ES2369208T3 (es) 2011-11-28

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