EP0361328B1 - Pompe à jet auto-amorçante avec diffuseur axial - Google Patents

Pompe à jet auto-amorçante avec diffuseur axial Download PDF

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Publication number
EP0361328B1
EP0361328B1 EP89117553A EP89117553A EP0361328B1 EP 0361328 B1 EP0361328 B1 EP 0361328B1 EP 89117553 A EP89117553 A EP 89117553A EP 89117553 A EP89117553 A EP 89117553A EP 0361328 B1 EP0361328 B1 EP 0361328B1
Authority
EP
European Patent Office
Prior art keywords
diffuser
impeller
ejector
pump
pump casing
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
Application number
EP89117553A
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German (de)
English (en)
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EP0361328A1 (fr
Inventor
Carlo Serafin
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.)
Calpeda SpA
Original Assignee
Calpeda SpA
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Filing date
Publication date
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Application filed by Calpeda SpA filed Critical Calpeda SpA
Publication of EP0361328A1 publication Critical patent/EP0361328A1/fr
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Publication of EP0361328B1 publication Critical patent/EP0361328B1/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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps

Definitions

  • the invention concerns a centrifugal self-priming jet pump according to the pre-characterizing portion of Claim 1.
  • Jet pumps generally known as "jet” pumps of the known type have a radial diffuser around the periphery of their impeller, i.e. a channel with a sectional area increasing in the stream direction for the purpose of converting as far as possible the kinetic energy of the medium flowing out of the impeller into pressure energy.
  • the centrifugal effect separates the air from the induced medium.
  • the air has a tendency to collect around the axis of rotation and it arrives with difficulty at the delivery connection.
  • the pumps of the known type almost always require complicated adjustment devices with a throttle valve, in order to obtain the priming with the maximum suction heights.
  • said devices require in their construction a special component inserted between the pump casing and the diffuser or the addition to the pump casing or to the diffuser of said separating devices, or the addition of blades within the pump casing, or on the diffuser or on the ejector, which complicates the manufacturing process for the casting or the die-drawing process or for the machining and the assembly, which entails increases in weight and in manufacturing costs.
  • the diffuser has the purpose of conveying the outflowing medium from an impeller to the suction connection of the subsequent impeller and it is arranged on the backside of each impeller.
  • the axial diffuser having radial return channels with a central exit has found up to now a special application in submerged multistage pumps for wells, since it permits the decrease in the number of the pump stages by increasing the diameter of the impellers in a pump casing wherein the maximum diameter is dictated by the diameter of the well.
  • the blades of the return channels end radially and/or axially before the exit opening.
  • the purpose of the present invention is to eliminate said inconveniences and to overcome the limitations presented by the known embodiments.
  • a purpose of the present invention is a self-priming jet pump with an axial diffuser, wherein the medium flowing into the pressure chamber may flow axially without any rotational component, so as to make it easier for the air to exit from the delivery connection and to allow the priming regularity even when the delivery connection is completely open and even with the maximum suction heights, this being obtained without adding may device for this purpose besides the diffuser.
  • Another purpose of the invention is to obtain a self-priming jet pump running more silently by eliminating the rotation of the induced medium and of the air within the pump casing.
  • Another purpose of the present invention is a self-priming jet pump, wherein the replacement of the radial diffuser with an axial diffuser yields a pump casing with an external diameter which is smaller than the outer diameter of a pump offering the same performance and having an impeller with the same diameter.
  • Another purpose of the invention is to decrease the inner diameter of the casing containing an impeller, whose diameter must be chosen according to the required performance.
  • Yet another purpose of the invention is to obtain a construction, which must be more compact and lighter in weight than a traditional jet pump with a radial diffuser and with an impeller of equal diameter and a pump casing made of the same material.
  • the minimum weight is important in order to obtain this type of pump in the portable version as well.
  • centrifugal self-priming jet pump which, in accordance with the patent claims, comprises a pump casing, wherein an impeller, a diffuser and an ejector unit are arranged, and which is characterized in that the diffuser is of the axial type, that it is attached between the pump casing and the ejector, that it is arranged facing the impeller, on its suction side and that its interior presents some return channels with a tendencially radial arrangement, which are suited to convey axially and without rotation, through a central opening, the medium flowing out of the impeller into the pressure chamber of the pump casing.
  • a characteristic of the invention is the application of a diffuser having return channels with a central exit in a single-impeller pump, in general, and in a single-impeller jet pump, in particular.
  • Another characteristic of the invention is the arrangement of the axial diffuser having radial return channels with a central opening, facing the impeller on the suction side.
  • Yet another characteristic of the invention is the lengthening in the axial direction of the blades at the exit of the return channels, in order to eliminate even the residual rotation component.
  • Another characteristic of the invention is the replacement of the radial diffuser around the periphery of the impeller with a diffuser facing the impeller on its suction side, in order to decrease the outer diameter of a centrifugal, single-impeller jet pump, wherein the diameter of the impeller is dictated by the required performance of the pump itself.
  • Yet another characteristic of the invention is the presence of deflecting means having an axial inclination and a radial curvature, at the entrances of the axial diffuser in the round-shaped chamber around the impeller, which allows a speedier exit of the air during the priming phase.
  • a single-impeller, self-priming jet pump is obtained which, thanks to the presence of the axial diffuser arranged facing the impeller, presents decreased radial dimensions in relation to pumps with the same characteristics but with a radial diffuser arranged around the periphery of the impeller.
  • the presence of the axial diffuser eliminates the rotational component of the medium flowing into the pressure chamber, so as to make the priming of the pump easier and its running less noisy.
  • the pump according to the invention also insures the priming regularity even with the delivery connection completely open and with the maximum values of suction heights.
  • Fig. 1 wherein the pump of the invention is indicated as a whole with 1, it can be observed that it consists of a pump casing 2, within which there is an ejector 3 with its corresponding supplying nozzle 4 (not represented in the drawing), arranged co-axially to each other on axis 5, and the centrifugal impeller 6, which is attached to the motor shaft 7, connected with a driving motor (not represented in the drawing).
  • a pump casing 2 within which there is an ejector 3 with its corresponding supplying nozzle 4 (not represented in the drawing), arranged co-axially to each other on axis 5, and the centrifugal impeller 6, which is attached to the motor shaft 7, connected with a driving motor (not represented in the drawing).
  • axis 5 of the ejector is co-axial with axis 9 of rotation of impeller 6; the representation of the axes 5 and 9 which are co-axial to each other is purely indicative, since the idea of the present invention maintains its validity even if the axes of rotation of the centrifugal impeller and of the nozzle-ejector unit were not coinciding with each other.
  • the axial diffuser 10 Facing impeller 6 on its suction side there is the axial diffuser 10 which, as can be observed, consists of an inner disc 11 attached to ejector 3 and of an outer disc 12 facing each other.
  • the inner disc 11 can also be made in a single unit together with ejector 3.
  • the axial diffusor arranged facing the impeller has the task of deflecting, with as little loss as possible, the vortex-free stream flowing out of the impeller and of converting it into an axial stream as free of whirling as possible, by decreasing its speed and increasing its static pressure.
  • the air can stream more easily out of the delivery connection and, at the same time, the driving medium is conveyed to the nozzle without any whirling and without any recycling of air, so that the suction flow through the ejector will be prevented from being set into pre-rotation toward the impeller.
  • the blades 13 which, therefore, constitute a unit forming the axial diffuser 10 attached within the pump casing 2.
  • the blades 13 connect the openings 14 obtained in the outer band of the inner disc 11 with the opening 15 obtained in the inner band of the outer disc 12.
  • Each opening 14 is connected through the blades 13 with opening 15 by a return channel 16 having a tendencially radial arrangement.
  • the blades 13 continue axially for a stretch 19 over collar 21, beyond opening 15, so as to eliminate even the residual rotation.
  • This axial lengthening of the blades 13 occurs within the pressure chamber 17, without influencing the length of the pump.
  • the axial lengthening of the blades 13 can also be made within opening 15, whenever said opening 15 on disc 12 has a tube-shaped extension 23 (in the shape of a cylinder, or a cone or another shape) in the axial direction.
  • the medium flowing out of impeller 6 enters through the openings 14, along the channel 16 having a radial direction and flows into the pressure chamber 17 with an axial direction, as represented by arrow 18.
  • diffuser 10 presents some deflecting means 24 projecting from wall 11, which are connected with the openings 14 at an axial inclination and are connected at a radial curvature with the cilyndrical wall of the round chamber 22.
  • the air can more easily stream out of the delivery connection 20.
  • Such construction concept also insures the priming regularity of the pump even when the delivery connection 20 is completely open and even under the conditions of maximum suction height, so that the throttle valve adjustment devices which are necessary in the self-priming jet pumps of the known types, are no longer needed.
  • the manufacturing phase of the diffusor according to the invention it will be possible to apply some modifications of a constructive or a functional nature with the purpose of improving its performance or of making the manufacture easier.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (5)

1. Pompe centrifuge à un étage autoamorçante à jet comprenante un corps de pompe (2), dans lequel sont positionnés une roue (6), un diffuseur (10) et une unité ejecteur (3), caractérisée en ce que le diffuseur (10) est de type axial et il est positionné en face de la roue (6) de son côté aspirant et qu'il est attaché entre l'intérieur du corps de pompe (2) et l'extérieur de l'éjecteur (3), ledit diffuseur présentant à l'intérieur des canaux de retour (16) avec un arrangement fondamentalement radial, aptes à convoyer axiallement à travers une ouverture centrale (15) dans la chambre de refoulement (17) du corps de pompe (2) le flux sortant de la roue (6).
2. Pompe centrifuge autoamorçante à jet selon la revendication 1, caractérisée en ce que le diffuseur (10) consiste en un disque intérieur (11) fixé entre l'intérieur du corps de pompe (2) et l'extérieur de l'éjecteur (3), ledit disque intérieur (11) présentant une pluralité d'ouvertures (14) arrangées le long de sa périphérie circumférentielle extérieure, et en un disque extérieur (12) qui est attaché au précédent et en face du même, ledit disque extérieur (12) présentant une ouverture centrale (15) ayante la forme d'une couronne ronde positionnée autour du collier (21) du disque intérieur (11), des aubes (13) étant positionnées entre lesdits disques, formant une pluralité de canaux de retour (16), obtenus en raccordant chaque ouverture (14), positionnée le long de la périphérie circumférentielle extérieure du disque intérieur (11) avec l'ouverture centrale (15) du disque extérieur (12), lesdites aubes (13) continuant pour un certain trait axial (19) en direction axiale sur le collier (21).
3. Pompe centrifuge selon la revendication 1, caractérisée en ce que le diffuseur (10) est claveté entre l'intérieur du corps de pompe (2) et l'extérieur de l'éjecteur (3) lorsque l'éjecteur (3) est dans le corps de pompe (2).
4. Pompe centrifuge selon la revendication 1, caractérisée en ce que la chambre ronde (22) autour de la roue (6) présente des déflecteurs (24) ayants une inclinaison axiale et un cintrage radial.
5. Pompe centrifuge autoamorçante à jet selon la revendication 2, caractérisée en ce que le disque intérieur (11) du diffuseur (10) constitue une seule unité avec l'éjecteur (3).
EP89117553A 1988-09-26 1989-09-22 Pompe à jet auto-amorçante avec diffuseur axial Expired EP0361328B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8885644A IT1225597B (it) 1988-09-26 1988-09-26 Pompa autoadescante ad eiettore con corona direttrice assiale.
IT8564488 1988-09-26

Publications (2)

Publication Number Publication Date
EP0361328A1 EP0361328A1 (fr) 1990-04-04
EP0361328B1 true EP0361328B1 (fr) 1992-04-01

Family

ID=11329488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117553A Expired EP0361328B1 (fr) 1988-09-26 1989-09-22 Pompe à jet auto-amorçante avec diffuseur axial

Country Status (4)

Country Link
EP (1) EP0361328B1 (fr)
DE (1) DE68901122D1 (fr)
ES (1) ES2031329T3 (fr)
IT (1) IT1225597B (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1234116B (it) * 1989-06-07 1992-04-29 Novax S R L Pompa centrifuga autoadescante.
IT1243113B (it) 1990-06-08 1994-05-24 Calpeda A Spa Diffusore longitudinale periferico per pompa monogirante centrifuga autoadescante
FR2696793B1 (fr) * 1992-10-13 1995-01-06 Salmson Pompes Pompe à refoulement axial.
IT1287367B1 (it) 1996-11-27 1998-08-04 Calpeda A Spa Dispositivo diffusore e convogliatore per pompa monogirante centrifuga autoadescante.
ITVI980028A1 (it) 1998-02-13 1999-08-13 Calpeda A Spa Pompa autodescante ad eiettore con dispositivo di controllo del flusso
IT1315546B1 (it) * 2000-11-14 2003-02-18 Calpeda A Spa Ruota direttrice per pompe centrifughe
DE60303788T2 (de) * 2003-08-29 2006-10-05 Pedrollo S.P.A., San Bonifacio Selbstansaugende Kreiselpumpe
ITPD20070414A1 (it) * 2007-12-19 2009-06-20 Ln 2 Srl Socio Unico Ventilatore centrifugo
ES2460369B1 (es) * 2012-11-12 2015-03-02 Coprecitec Sl Bomba de circulación de fluido adaptada para un aparato electrodoméstico
CN108252919A (zh) * 2018-03-19 2018-07-06 浙江大元泵业股份有限公司 一种喷射泵及其导叶
WO2020108432A1 (fr) * 2018-11-28 2020-06-04 陈久斌 Machine à vortex
CN114109911B (zh) * 2021-12-25 2024-05-17 浙江日井泵业股份有限公司 一种可有效降低噪音的泵体以及自吸泵
EP4660460A1 (fr) * 2024-06-06 2025-12-10 Dab Pumps S.p.A. Pompe centrifuge

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE906894C (de) * 1941-10-16 1956-08-09 Siemen & Hinsch Gmbh Leitrad fuer Kreiselpumpen
US2941474A (en) * 1956-08-20 1960-06-21 Fairbanks Morse & Co Self-priming pumping apparatus
US3730641A (en) * 1972-03-10 1973-05-01 Flint & Walling Inc Centrifugal pumps
DE3718273C2 (de) * 1986-09-01 1994-12-15 Apollowerk Goesnitz Gmbh Selbstansaugende horizontale Radialkreiselpumpe

Also Published As

Publication number Publication date
IT1225597B (it) 1990-11-22
IT8885644A0 (it) 1988-09-26
EP0361328A1 (fr) 1990-04-04
ES2031329T3 (es) 1992-12-01
DE68901122D1 (de) 1992-05-07

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