EP0361329A1 - Pompe à jet auto-amorçante avec éjecteur incorporé - Google Patents

Pompe à jet auto-amorçante avec éjecteur incorporé Download PDF

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Publication number
EP0361329A1
EP0361329A1 EP89117554A EP89117554A EP0361329A1 EP 0361329 A1 EP0361329 A1 EP 0361329A1 EP 89117554 A EP89117554 A EP 89117554A EP 89117554 A EP89117554 A EP 89117554A EP 0361329 A1 EP0361329 A1 EP 0361329A1
Authority
EP
European Patent Office
Prior art keywords
ejector
pump casing
diaphragm
pump
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.)
Granted
Application number
EP89117554A
Other languages
German (de)
English (en)
Other versions
EP0361329B1 (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
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Calpeda SpA
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Filing date
Publication date
Application filed by Calpeda SpA filed Critical Calpeda SpA
Publication of EP0361329A1 publication Critical patent/EP0361329A1/fr
Application granted granted Critical
Publication of EP0361329B1 publication Critical patent/EP0361329B1/fr
Expired 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
    • 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
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the invention concerns a self-priming jet pump with a pump casing without any undercut, the seats of the ejector for its connection with the pump casing being coaxial with the rotation axis of the impeller and the suction connection being positioned at the front end of the pump above the rotation axis.
  • Centrifugal, self-priming jet pumps usually known as "Jet” pumps are special types of centrifugal pumps combined with a venturi ejector, which are used in several domains and for a plurality of applications, such as drawing water out of a well or, more in general, drawing liquids from tanks placed at a certain depth. They may also be used as pressure boosting pumps for central low pressure water systems.
  • the self-priming jet pumps are built with a pump casing containing the suction chamber and the pressure chamber, which are obtained by dividing the inner volume of the pump casing by means of partitions.
  • Said forms of execution entail some difficulty in the manufacture of the pump casing, because of the presence of the undercuts, which require, when the pump casing is a single piece obtained through casting, the use of complicated dies and the necessity of inserting cores. Even when the pump casing is obtained through die drawing, it requires some complex carpentry operations for the welding of the added diaphragms.
  • the pump casing is built without undercuts, since it contains the suction chamber in the ejector unit, which is directly connected with the suction connection positioned above the rotation axis.
  • This type of execution entails the inconvenience that the ejector presents closed chambers, obtained through casting with a core, as disclosed in the US patent 2 700 338, or through die-drawing and then joining together several parts by welding or by means of screws or of snap hooks or by other means and by interposing sealing or gluing materials, which make the disassembly and the ensuing re-assembly difficult and sometimes impossible.
  • Said types of execution also entail the inconvenience that the presence of the closed chambers make it difficult to check whether within the pump casing or the ejector there are foreign bodies which may have entered accidentally while the pump was operating or whether there are settling solids.
  • the pump casing is made without any undercut and the seats for the connection of the ejector are coaxial with the axis of rotation while the suction connection is positioned on the plane passing through the axis of rotation, as disclosed for instance in the US patent 2 934 021.
  • Such an execution presents the inconvenience of preventing the pump casing from filling up with a sufficient amount of water at the initial priming, unless there is a check valve in the suction pipe.
  • the purpose of the present invention is that of overcoming the mentioned inconveniences.
  • the main purpose of the invention is to obtain a centrifugal self-priming jet pump, whose pump casing does not present any undercuts and can be obtained by die-casting without core or by shell moulding or die-drawing and whose ejector consists of a single body made without closed chambers which is, therefore, easy to make by die-drawing and to check.
  • Another purpose of the invention is that of obtaining a centrifugal self-priming pump, whose pump casing presents the seats for the connection of the ejector being coaxial with the rotation axis of the impeller, so as to make it easily machinable, if necessary, by using a lathe.
  • Another purpose of the invention is that of obtaining a self-­priming jet pump, wherein the nozzle is positioned eccentrically in the ejector collar, in order to obtain an anti-vortex arrangement in the supplying high-pressure chest.
  • the last but not the least purpose is that of obtaining a centrifugal self-priming jet pump which is easy to assemble and to disassemble.
  • a self-priming jet pump comprising a pump casing complete with a suction connection and a delivery connection, within which a unit consisting of an ejector and a nozzle is arranged, said jet pump being characterized in that the pump casing presents a shape lacking undercut surfaces, since it is obtained by a moulding process using two axially counterposed plungers, one of which shapes the inner volume of the pump, while the other shapes the suction connection, said pump casing being provided with seats for the connection of the ejector which are coaxial with the rotation axis of the impeller.
  • said ejector presents a transversally arranged diaphragm, which is suited to divide the inner volume of the pump casing, so as to realize a suction chamber and a pressure chamber, and a frontal collar which is suited to divide the suction chamber, so as to realize a duct and a high-pressure chest for supplying the nozzle.
  • Said nozzle is connected in the ejector collar in an eccentric position. Moreover, the suction connection is positioned frontally above the collar and it is partially or completely circumscribed by the diaphragm.
  • a more economical centrifugal self-priming pump is obtained, since the pump casing is easier to manufacture because of the absence of the undercuts and easier to machine in case it is obtained through casting because of the co-axiality of the seats for the connection of the ejector with the rotation axis of the impeller. Moreover, the absence of the undercuts in the pump casing permits to check completely and immediately whether any foreign bodies or settling solids are present in its interior, while the ejector drawn in a single body without any closed chambers also presents the advantage that it can be totally and immediately checked.
  • the eccentric arrangement of the nozzle in the ejector collar yields the advantage, in comparison with a coaxial arrangement, of a larger cross-section of the driving medium channel through the collar, of a larger cross-section for the passage of the suction around the nozzle and of a minimum volume of the air pocket in the high-pressure chest at the first filling.
  • the pump according to the invention which is indicated as a whole with 1 in Fig. 1, consists of a pump casing 2 presenting in its interior the suction chamber 3, which is connected with the suction connection 4, and the pressure-chamber 5, which is connected with the delivery connection 6.
  • the suction chamber 3 and the pressure chamber 5 are obtained through the separation of the inner volume of the pump casing 2 by means of a diaphragm 7, constituting a single body with ejector 8 and being arranged radially with an external diameter which is coaxial with axis 21 of impeller 22.
  • suction chamber 3 presents in its interior a collar 10 arranged on the front part of ejector 8 and also constituting a single body with the ejector, said collar having also an external diameter which is coaxial with axis 21 and defining a high-­pressure chest 11 for supplying nozzle 12 with the driving medium, which enters the supplying high-pressure chest 11 through channel 24 in the direction indicated by arrow 13.
  • the pump casing 2 is made so as not to present any undercut in the front in the moulding directions indicated by the arrows 14 in Fig. 3, which makes it possible to obtain the pump casing 2 through casting by using a die with two plungers and without a core.
  • the pump casing 2 can also be obtained through die-drawing of a metal sheet or by plastic moulding, since, as can be observed in Fig. 3, opening 15 for the lodging of diaphragm 7, can be obtained by means of a plunger 16, while the opening of the suction connection 4 can be obtained by means of a plunger 17 counterposed to the preceeding one.
  • the first purpose of the invention has been fulfilled. It concerned the realization of a centrifugal self-priming jet pump whose pump casing can be obtained through die-casting or die-drawing by using simple dies, thanks to the lack of undercuts.
  • the ejector-nozzle unit 19 is assembled within the pump casing by connecting diaphragm 7 of ejector 8 with seat 15 and collar 10 of the ejector 8 itself on seat 20 obtained on the vertical wall 80 of the pump casing 2 arranged facing impeller 22.
  • the high-­pressure chest presents an axial symmetry within the round-shaped seat 20 for the connection of collar 10 of ejector 8.
  • the drawings show a preferred assembly position of the nozzle-­ejector unit 19 with nozzle 12 at the top and channel 24 at the bottom, the nozzle-ejector unit 19 can also be assembled within the seats 15 and 20 at different angular positions, without thereby compromising the operation of the pump. It is this form of execution which permits an easy assembly and disassembly of the nozzle-ejector unit 19 on and from the pump casing 2, which makes it easier to perform maintenance and check-up operations on the pump.
  • the seats 15 and 20 present a transversal round-shaped cross-section and that they are coaxial with each other and with the axis 21 of rotation of impeller 22 and that they are, therefore, easily machinable, for instance, with a lathe, after the casting or die-drawing of the pump casing 2, in the case that the latter requires a finishing working process.
  • collar 10 connected with ejector 8 which creates the high-pressure chest 11 contains channel 24 supplying the driving medium flowing from impeller 22 and entering channel 24 in the direction 13.
  • Nozzle 12 is coaxial with axis 9 of the venturi tube of ejector 8 and it is eccentrically arranged with eccentricity 23 in relation to the axis 21 of rotation of impellar 22 and of the seats 15 and 20 in the pump casing 2.
  • the area of section 81 for the passage of the induced medium around nozzle 12 is also made as large as possible, since as can observed in Fig. 2, the passage area 81 also includes area 25 arranged below axis 9 of nozzle 12 in ejector 8, area 25 representing the area increase ensuing from the off-center arrangement 23 between the axes 9 and 21 of the nozzle-ejector unit 19.
  • Fig. 5 shows a first embodiment, wherein the entire inner part of the pump casing 30 can be moulded with a single plunger, while diaphragm 32 belonging to ejector 33 circumscribes completely the suction connection 34, comprised between the seats 31 and 36 for the connection of ejector 33 within the pump casing 30.
  • FIG. 6 represents another embodiment, wherein the pump casing 40 presents the same characteristics of the previously described pump casing 30, while diaphragm 42, which in this case, too, circumscribes and contains completely the suction connection 44, is separated from the ejector 43 and consists of a round-shaped crown inserted within seat 41 of the pump casing 40, while ejector 43 is inserted within seat 46 in the pump casing 40 and within seat 49 in diaphragm 42.
  • Fig. 7 shows another embodiment, wherein the inner part of the pump casing 50 presents the same moulding characteristics of its inner part with a single plunger, as in the already described examples of the pump casings 30 and 40.
  • diaphragm 52 is separated from ejector 53 and, since it is shaped as a dome inserted within seat 51 of the pump casing 50, it includes also the high-pressure chest 55 and the seats 56 and 59 for the connection of ejector 53.
  • One or more openings 58 obtained on dome 52 between the seats 56 and 59 constitute the suction passages.
  • the pump casing 60 is preferably made of a die-­drawn metal sheet with a suction connection 64 welded on its exterior, where the suction passage 68 is to be found, which is obtained between the seats 66 and 69.
  • diaphragm 62 as the previously described diaphragm 52 of Fig. 7, besides incorporating the high-pressure chest 65 and the seats 66 and 69 for the connection of collar 67 of ejector 63, also constitutes a single body together with the pump casing 60.
  • Fig. 9 shows yet another embodiment, wherein the pump casing 70 is preferably made of a die-drawn metal sheet and it presents the same moulding characteristics of its inner part with a single plunger, as has been described for the previously described pump casings 30, 40 and 50 and it also includes the suction connection 74 and the high-pressure chest 75, while diaphragm 72, which in this case, too, circumscribes and contains completely the suction connection 74, is separated from ejector 73 and is inserted within seat 71 of the pump casing 70.
  • the pump casing 70 is preferably made of a die-drawn metal sheet and it presents the same moulding characteristics of its inner part with a single plunger, as has been described for the previously described pump casings 30, 40 and 50 and it also includes the suction connection 74 and the high-pressure chest 75, while diaphragm 72, which in this case, too, circumscribes and contains completely the suction connection 74, is separated from ejector 73 and is inserted within seat 71 of the
  • Ejector 73 is inserted within seat 76 in the pump casing 70 and within seat 79 of diaphragm 72.
  • the outer diameter of diaphragm 72 and its seat 71 within the pump casing 70 can be made concentrical with the inner diameter and coaxial with seat 76, as the previously described diaphragm 42.
  • the pump casing can be made with the seats for the connection of the diaphragm and of the ejector collar, which are co-axial with the axis of rotation of the impeller, in order to be machined more easily.
  • the special off-center arrangement of the axis of the nozzle in relation to the axis of rotation of the impeller permits to eliminate vortexes in the high-pressure chest for supplying the nozzle with the driving medium and it also makes it possible to enlarge as much as possible the section area for the passage of the driving medium through the collar and through the suction opening around the nozzle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP89117554A 1988-09-26 1989-09-22 Pompe à jet auto-amorçante avec éjecteur incorporé Expired EP0361329B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8885643A IT1225596B (it) 1988-09-26 1988-09-26 Pompa autoadescante ad eiettore.
IT8564388 1988-09-26

Publications (2)

Publication Number Publication Date
EP0361329A1 true EP0361329A1 (fr) 1990-04-04
EP0361329B1 EP0361329B1 (fr) 1992-01-29

Family

ID=11329474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117554A Expired EP0361329B1 (fr) 1988-09-26 1989-09-22 Pompe à jet auto-amorçante avec éjecteur incorporé

Country Status (4)

Country Link
EP (1) EP0361329B1 (fr)
DE (1) DE68900795D1 (fr)
ES (1) ES2029549T3 (fr)
IT (1) IT1225596B (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864760A3 (fr) * 1997-03-15 1999-08-18 Grundfos A/S Carter de pompe moulable pour ensemble motopompe, pour montage sur la paroi d'un dispositif
EP1111244A2 (fr) 1999-12-23 2001-06-27 Grundfos A/S Pompe auto-amorçante
RU2175406C1 (ru) * 2000-05-26 2001-10-27 Несытов Евгений Константинович Центробежный самовсасывающий насос
ES2161191A1 (es) * 2000-03-27 2001-11-16 Bogemar Sl Bomba centrifuga con hidroeyector.
CN101581312B (zh) * 2009-06-10 2011-06-29 江苏大学 一种大流量自吸泵
CN102562604A (zh) * 2011-12-22 2012-07-11 安徽江南泵阀有限公司 高性能耐强腐蚀自吸泵
WO2020013729A1 (fr) 2018-07-10 2020-01-16 Yazykov Andrey Yurievich Pompe centrifuge
CN111268438A (zh) * 2020-02-28 2020-06-12 江苏大学 一种过流无损多相混输泵
CN112555137A (zh) * 2020-12-14 2021-03-26 宁波君禾智能科技有限公司 水泵控制系统
CN112703320A (zh) * 2018-09-12 2021-04-23 倍得龙有限公司 自吸式离心泵
CN115059621A (zh) * 2022-07-09 2022-09-16 兰州工业学院 一种脉冲射流自吸泵
CN115199594A (zh) * 2022-07-14 2022-10-18 兰州理工大学 一种射流自吸泵

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1022632A (fr) * 1950-07-28 1953-03-06 Perfectionnement aux pompes centrifuges
US2700338A (en) * 1950-11-15 1955-01-25 Barnes Mfg Co Shallow well centrifugal pump with jet
US2934021A (en) * 1956-10-09 1960-04-26 F E Meyers & Bro Co Shallow well self-priming jet pump
US3394655A (en) * 1966-09-19 1968-07-30 Richard J. Brown Combined centrifugal and jet type fluid pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1022632A (fr) * 1950-07-28 1953-03-06 Perfectionnement aux pompes centrifuges
US2700338A (en) * 1950-11-15 1955-01-25 Barnes Mfg Co Shallow well centrifugal pump with jet
US2934021A (en) * 1956-10-09 1960-04-26 F E Meyers & Bro Co Shallow well self-priming jet pump
US3394655A (en) * 1966-09-19 1968-07-30 Richard J. Brown Combined centrifugal and jet type fluid pump

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864760A3 (fr) * 1997-03-15 1999-08-18 Grundfos A/S Carter de pompe moulable pour ensemble motopompe, pour montage sur la paroi d'un dispositif
EP1111244A2 (fr) 1999-12-23 2001-06-27 Grundfos A/S Pompe auto-amorçante
EP1111244A3 (fr) * 1999-12-23 2002-05-15 Grundfos A/S Pompe auto-amorçante
ES2161191A1 (es) * 2000-03-27 2001-11-16 Bogemar Sl Bomba centrifuga con hidroeyector.
RU2175406C1 (ru) * 2000-05-26 2001-10-27 Несытов Евгений Константинович Центробежный самовсасывающий насос
CN101581312B (zh) * 2009-06-10 2011-06-29 江苏大学 一种大流量自吸泵
CN102562604A (zh) * 2011-12-22 2012-07-11 安徽江南泵阀有限公司 高性能耐强腐蚀自吸泵
WO2020013729A1 (fr) 2018-07-10 2020-01-16 Yazykov Andrey Yurievich Pompe centrifuge
CN112703320A (zh) * 2018-09-12 2021-04-23 倍得龙有限公司 自吸式离心泵
CN112703320B (zh) * 2018-09-12 2023-02-28 倍得龙有限公司 自吸式离心泵
CN111268438A (zh) * 2020-02-28 2020-06-12 江苏大学 一种过流无损多相混输泵
CN111268438B (zh) * 2020-02-28 2022-02-22 江苏大学 一种过流无损多相混输泵
CN112555137A (zh) * 2020-12-14 2021-03-26 宁波君禾智能科技有限公司 水泵控制系统
CN115059621A (zh) * 2022-07-09 2022-09-16 兰州工业学院 一种脉冲射流自吸泵
CN115059621B (zh) * 2022-07-09 2023-10-27 兰州工业学院 一种脉冲射流自吸泵
CN115199594A (zh) * 2022-07-14 2022-10-18 兰州理工大学 一种射流自吸泵

Also Published As

Publication number Publication date
IT1225596B (it) 1990-11-22
ES2029549T3 (es) 1992-08-16
EP0361329B1 (fr) 1992-01-29
DE68900795D1 (de) 1992-03-12
IT8885643A0 (it) 1988-09-26

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