WO1993006372A1 - Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter - Google Patents

Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter Download PDF

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Publication number
WO1993006372A1
WO1993006372A1 PCT/EP1992/002211 EP9202211W WO9306372A1 WO 1993006372 A1 WO1993006372 A1 WO 1993006372A1 EP 9202211 W EP9202211 W EP 9202211W WO 9306372 A1 WO9306372 A1 WO 9306372A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressure chamber
suction inlet
axial
impeller
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.)
Ceased
Application number
PCT/EP1992/002211
Other languages
English (en)
Inventor
Bruno Caoduro
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.)
Fip Fabbrica Italiana Pompe Srl
FORAS PUMPS Srl
Original Assignee
Fip Fabbrica Italiana Pompe Srl
FORAS PUMPS Srl
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 Fip Fabbrica Italiana Pompe Srl, FORAS PUMPS Srl filed Critical Fip Fabbrica Italiana Pompe Srl
Priority to EP92920612A priority Critical patent/EP0605579A1/fr
Publication of WO1993006372A1 publication Critical patent/WO1993006372A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D5/00—Pumps with circumferential or transverse flow
    • F04D5/002—Regenerative pumps

Definitions

  • the present invention relates to an improved pump casing for centrifugal pumps with a particularly simplified structure, which can be obtained by casting, pressure die-casting or by other processes for forming metallic materials such as cast iron, steel, brass, bronze and the like.
  • centrifugal or liquid-ring pumps are normally used to raise liquids from shallow wells or to circulate them in small-capacity household systems.
  • Such pumps generally have a casing which is defined by a main portion, provided with an axial suction inlet, an approximately radial discharge outlet and a pressure chamber or volute accommodating an impeller with peripheral blades, which is coupled to a secondary portion for the closure of the pressure chamber and connection to an electric motor or the like.
  • an accumulation pre-chamber R is defined proximate to the inner end of the suction inlet B; the pre-chamber has a slightly conical toroidal shape and is adjacent to a substantially annular pressure chamber or volute P.
  • the accumulation chamber R has a front wall, or partition S at its inner end. Partition S separates chamber R from the pressure chamber P.
  • a channel C extends between the upper region of the accumulation chamber, externally with respect to the partition, and the pressure chamber or volute, and ensures the continuous filling of the volute.
  • the casing has, in the pressure chamber, annular ridges which define front skimming surfaces for the impeller, with axial plays on the order of a few hundredths of a millimeter. This entails the risk of sticking of the impeller during idle periods, considerable initial separation friction, shorter impeller life and a certain noise.
  • the aim of the present invention is to eliminate, or at least considerably limit, the above described problems by providing a pump casing with simplified structure, obtainable by pressure die-casting or by means of other methods for forming metallic materials, which allows to considerably reduce its manufacturing costs.
  • An object of the present invention is to provide a centrifugal pump casing which is lighter and more compact than conventional ones.
  • Another object is to provide a pump casing which has less risk of impeller sticking and lower initial separation friction and furthermore has a self-cleaning effect on the impeller.
  • Not least object of the present invention is to provide a method for the simplified manufacture of the above described pump casing.
  • a pump casing for centrifugal pumps which can be obtained by casting, pressure die-casting or by another process for the forming of a metallic material, comprising an axial suction inlet connected to a pressure chamber shaped as an annular volute, a centrifugal impeller being arranged in said pressure chamber, said pressure chamber being provided with a radial discharge outlet, characterized in that said suction inlet has a substantially radial peripheral passage and an axial channel at the region where it is connected to the pressure chamber both said peripheral passage and said axial channel being connected to the pressure chamber and being obtained by means of a single core (F) which forms both said suction inlet and said chamber.
  • F single core
  • the casing can be produced by using a single forming core instead of two as in the prior art.
  • the casing has, along the edge of the axial channel, a first axial ridge which forms a front skimming surface for the impeller and defines, together with the non- bladed surface of the impeller, an element for separating the axial channel from the volute.
  • Said casing furthermore has, on the portion for connection to the motor, a second axial ridge which forms a further front skimming surface for the impeller, at least one of said ridges being interrupted by a radial groove which forms a passage between the suction inlet and the volute.
  • a method for the production of castings or pressure die-castings of casings for centrifugal pumps wherein a single core is adapted to define both the suction inlet and the pressure chamber which are mutually connected by means of a substantially radial peripheral passage and an axial channel.
  • Figure ! is a partially sectional side view of a pump casing of the prior art, taken along an axial vertical plane;
  • Figure 2 is a partially sectional front view of a first embodiment, of the pump casing according to the invention, taken along the transverse plane II-II of figure 3;
  • Figure 3 is a sectional side view of the casing of Figure 2, taken along the axial plane III-III;
  • Figure 4 is a partially sectional front, view of a second embodiment of the pump casing according to the invention, taken along a transverse plane IV-IV of Figure 5;
  • Figure 5 is a partially sectional side view of the casing of Figure 4, taken along the axial plane V-V;
  • Figure 6 is a partially sectional general side view of a centrifugal pump which includes the casing of Figures 2 and 3 ;
  • Figure 7 is a partially sectional general side view of a centrifugal pump which includes the casing of Figures 4 and 5.
  • a pump casing has a main portion 1 and a secondary portion 2.
  • the main portion 1 has a suction inlet 3, which is substantially tubular and coaxial to the axis O of the pump, and a discharge outlet 4, whose axis is substantially radial and slightly offset with respect to the axis 0 of the pump.
  • Both the suction inlet 3 and the discharge outlet are internally partially threaded to allow coupling to pipes, respectively for feed and discharge, which are not illustrated in the drawings.
  • the suction inlet 3 and the discharge outlet 4 are both connected to a pressure chamber which is shaped as an annular volute 5, defined inside the main portion 1 and closed by the secondary portion 2.
  • An impeller 6 with peripheral blades is accommodated in the volute 5.
  • the pressure chamber 5 is also connected to a secondary chamber 7. Sensors for measuring flow parameters are arranged in chamber 7 which is provided with a passage 8. Passage 8 is internally threaded and open outwardly. The suction inlet 3 is connected to the pressure chamber 5 through an approximately radial passage 9. Passage 9 is slightly inclined toward the discharge outlet and is suitable to convey the fluid toward the impeller 6.
  • the secondary portion 2 is fixed to a motor 10 by means of bolts 11 and is provided with seats for a mechanical seal 14 and a bearing 12 of the motor shaft 13.
  • the impeller 6 is keyed to shaft 13 and the mechanical seal 14 is arranged within the main portion 1 of the casing.
  • the main portion 1 is connected to the secondary portion 2 by inserting the peripheral edge of main portion 1 in an annular seat 15 of the secondary portion 2, and by means of connecting bolts 16 which are inserted in through holes 17 of the two portions.
  • the suction inlet 3 is provided with an axial channel 18 which is connected to the pressure chamber 5.
  • the radial passage 9 and the axial channel 18 can be obtained by means of a .single core F which extends uninterruptedly from the pressure chamber to the suction inlet and to the discharge outlet and is schematically indicated in broken lines in Figure 3.
  • An annular ridge 19 is provided along the edge of the opening 18 and has a front surface 20.
  • Front surface 20 forms an axial skimming surface for the impeller and cooperates with the non-bladed part thereof to separate the axial channel from the volute-shaped pressure chamber 5.
  • the connecting portion 2 of the pump body has a similar annular ridge 21.
  • the front surface 22 of ridge 21 also forms a radial skimming surface for the impeller.
  • Two partially radial curved wings 23 and 24 also extend from both ridges.
  • the two annular ridges 19' and 21' are interrupted by respective radial grooves 25 and 26 which define corresponding passages between the suction duct 3' and the pressure chamber 5' .
  • skimming surface 20' and 22" of each ridge 19' and 21' is interrupted at the side of the corresponding wing 23' and 24' which interrupts the continuity of the volute 5.
  • the fluid is then redirected from an axial direction to a radial direction until it enters the volute and is centrifuged by the set of blades until it exits through the discharge duct 4'.
  • the interruption of the skimming surfaces 20' and 22' reduces, in percentage terms, the region of possible impeller sticking.
  • the motor is thus less stressed during startup, and initial separation friction is also smaller. Longer impeller life is thus also obtained.
  • a single casting channel for a cluster of castings which comprises for example at least four parts.
  • a plurality of clusters can furthermore be arranged in the same casting box, for example four clusters arranged uniformly so as to optimize the process and reduce preparation and casting times.
  • the pump casing according to the invention achieves the intended aim and objects, and in particular the considerable constructive simplification of the semifinished parts, the significant reduction in the costs for the production of the semifinished parts and of the cores and the better operation and longer life of the pump are stressed.

Landscapes

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

Abstract

Carter pour pompes centrifuges obtenu par coulée, par moulage sous pression ou par un autre procédé de mise en forme de matériaux métalliques. Il comporte un orifice d'aspiration axial (3; 3') relié à une chambre de compression (5; 5') en forme de volute annulaire. Un rotor centrifuge (6; 6') est monté dans la chambre de compression munie d'un orifice de décharge radial (4; 4'). L'orifice d'aspiration (3; 3') possède un passage périphérique sensiblement radial (9; 9') et un passage axial (18; 18') au niveau de la zone dans laquelle il débouche dans la chambre de compression (5; 5'). Le passage périphérique et le passage axial sont reliés à la chambre de compression et obtenus au moyen d'un seul noyau (F) formant à la fois l'orifice d'aspiration et la chambre de compression. Une nervure annulaire (19; 19') est formée au bord de l'ouverture axiale (18) et constitue une surface axiale à effleurement (20; 20') pour la partie sans pales du rotor (6). Le rotor et la nervure forment ensemble un élément séparant l'orifice d'aspiration (3) de la chambre de compression (5). La nervure annulaire (19') est coupée par une rainure annulaire (25) évitant tout grippage et réduisant le frottement lors de l'amorçage._________
PCT/EP1992/002211 1991-09-27 1992-09-24 Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter Ceased WO1993006372A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92920612A EP0605579A1 (fr) 1991-09-27 1992-09-24 Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITVI910154A IT1253353B (it) 1991-09-27 1991-09-27 Corpo pompa ad anello liquido nonche' metodo di realizzazione di tale corpo.
ITVI91A000154 1991-09-27

Publications (1)

Publication Number Publication Date
WO1993006372A1 true WO1993006372A1 (fr) 1993-04-01

Family

ID=11424744

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1992/002211 Ceased WO1993006372A1 (fr) 1991-09-27 1992-09-24 Carter de pompe ameliore pour pompe centrifuge et procede de production de ce carter

Country Status (5)

Country Link
EP (1) EP0605579A1 (fr)
AU (1) AU2646792A (fr)
HU (1) HU9400897D0 (fr)
IT (1) IT1253353B (fr)
WO (1) WO1993006372A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005393A1 (fr) * 1995-08-01 1997-02-13 Robert Bosch Gmbh Pompe tourbillonnaire, notamment pour refouler du carburant du reservoir au moteur a combustion interne d'un vehicule a moteur

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973867A (en) * 1975-04-09 1976-08-10 Chien Fu Lee Radial flow type pump
EP0201377A1 (fr) * 1985-04-09 1986-12-17 POMPES SALMSON Société Anonyme à directoire dite: Pompe autoamorçante à hydroéjecteur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3973867A (en) * 1975-04-09 1976-08-10 Chien Fu Lee Radial flow type pump
EP0201377A1 (fr) * 1985-04-09 1986-12-17 POMPES SALMSON Société Anonyme à directoire dite: Pompe autoamorçante à hydroéjecteur

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 9, no. 268 (M-424)(1991) 25 October 1985 & JP,A,60 113 088 ( NIPPON DENSO ) 19 June 1985 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997005393A1 (fr) * 1995-08-01 1997-02-13 Robert Bosch Gmbh Pompe tourbillonnaire, notamment pour refouler du carburant du reservoir au moteur a combustion interne d'un vehicule a moteur
CN1083946C (zh) * 1995-08-01 2002-05-01 罗伯特·博施有限公司 特别从一种贮存箱向机动车内燃机输送燃料的辅助泵

Also Published As

Publication number Publication date
AU2646792A (en) 1993-04-27
HU9400897D0 (en) 1994-06-28
ITVI910154A0 (it) 1991-09-27
ITVI910154A1 (it) 1993-03-27
IT1253353B (it) 1995-07-25
EP0605579A1 (fr) 1994-07-13

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