EP0490908B1 - Sheet metal pump casing - Google Patents

Sheet metal pump casing Download PDF

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Publication number
EP0490908B1
EP0490908B1 EP90912183A EP90912183A EP0490908B1 EP 0490908 B1 EP0490908 B1 EP 0490908B1 EP 90912183 A EP90912183 A EP 90912183A EP 90912183 A EP90912183 A EP 90912183A EP 0490908 B1 EP0490908 B1 EP 0490908B1
Authority
EP
European Patent Office
Prior art keywords
annular space
housing
projections
centrifugal pump
pump housing
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
EP90912183A
Other languages
German (de)
French (fr)
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EP0490908A1 (en
Inventor
Karlheinz Becker
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.)
KSB AG
Original Assignee
KSB AG
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Publication date
Application filed by KSB AG filed Critical KSB AG
Publication of EP0490908A1 publication Critical patent/EP0490908A1/en
Application granted granted Critical
Publication of EP0490908B1 publication Critical patent/EP0490908B1/en
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
    • 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
    • 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
    • F04D29/4266—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps made of sheet metal
    • 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
    • F04D29/428—Discharge tongues
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/914—Device to control boundary layer

Definitions

  • the invention relates to a centrifugal pump housing according to the preamble of the main claim.
  • Centrifugal pump housings in sheet metal construction have a very good strength and, depending on the material used, a high level of resistance to a wide variety of fluids.
  • a disadvantage of these housings made in sheet metal construction is their low resistance to abrasive components in the pumped medium. In contrast to a considerably thicker cast housing, the thin-walled sheet metal housing is rather damaged under the influence of abrasive components.
  • a sheet metal housing corresponding to the preamble is known from DE-A 35 17 498.
  • the housing has an opening on its outer periphery into which a pressure port is fitted.
  • the so-called spur formed by the pressure port which supports the entry of the medium from the annular space into the pressure port, can be designed flush with the annular space or protrude into the annular space.
  • the spur is very susceptible to wear when conveying media with abrasive components.
  • the invention is therefore based on the object of developing a solution for a generic pump housing, with the aid of which in the conveyance of media containing abrasive components, a service life corresponding to Cast housing guaranteed.
  • This object is achieved in accordance with the characterizing part of the main claim.
  • the exit from the annular space, in which flow is deflected into the pressure port, has been shown to be particularly hazardous to wear.
  • the solution according to the invention in which the efficiency remains almost the same, the flow in the area of the outlet opening is deflected to the center of the housing, in order to then get into the pressure port without damaging the outlet opening.
  • the one attached to the end edge of the outlet opening To a certain extent, the protrusion has a flow-introducing effect in the pressure port, but at the same time it also acts as a wearing part and protects the thin housing wall from damage.
  • An embodiment of the invention provides that the length of the projections corresponds to the width of the annular space.
  • the projections can extend over the entire length or several parts can be staggered.
  • the abrasive components are removed from the edge zone of the outlet opening by the projections and then freely enter the pressure port.
  • a projection attached to the end edge of the outlet opening projects into the pressure port.
  • the protrusion acts as wear protection for directly impacting abrasive parts.
  • An impeller (2) is located within a pump housing (1) made of sheet metal, an annular space (3) being formed between the impeller and the circumference of the pump housing.
  • the pumped medium emerging from the impeller circulates within this annular space and leaves the annular space (3) through an outlet opening (4) provided on the circumference of the pump housing, in order to subsequently enter a pressure port (5).
  • the pump housing is connected to a piping system.
  • projections (8, 9) extending transversely to the flow direction are arranged on the start edge (6) and end edge (7) of the outlet opening (4). These prevent abrasive parts in the pumped medium from destroying the outlet opening (4) and the downstream pressure port (5) when they exit the annular space.
  • the magnitude of the solids content corresponds to the values that pump manufacturers usually allow for pure water pumps.
  • the projection (9) has a design on the basis of which it still extends into the outlet opening (4) and the pressure connection (5) adjoining it.
  • the so-called housing spur (10) is thus protected against direct attack by the abrasive components.
  • the height (H) of the projections is determined on the basis of the inside diameter (D) of the housing (1). The lower the height of the projections (8, 9), the less important is their influence on the pump efficiency.

Landscapes

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

Abstract

PCT No. PCT/EP90/01373 Sec. 371 Date Mar. 4, 1992 Sec. 102(e) Date Mar. 4, 1992 PCT Filed Aug. 20, 1990 PCT Pub. No. WO91/03649 PCT Pub. Date May 21, 1991.A centrifugal pump has a casing which accommodates an impeller for conveying abrasive fluid in a predetermined flow direction. The casing has a peripheral wall which is provided with an outlet opening for the fluid. The upstream side and downstream side of the opening are flanked by wear elements which extend transversely of the flow direction and project into the interior of the casing.

Description

Die Erfindung betrifft ein Kreiselpumpengehäuse gemäß dem Oberbegriff des Hauptanspruches.The invention relates to a centrifugal pump housing according to the preamble of the main claim.

Kreiselpumpengehäuse in Blechbauweise verfügen über eine sehr gute Festigkeit und je nach verwendetem Material über eine hohe Beständigkeit gegenüber den unterschiedlichsten Fördermedien. Nachteilig bei diesen in Blechbauweise hergestellten Gehäusen ist deren geringe Beständigkeit gegenüber abrasiven Bestandteilen im Fördermedium. Im Gegensatz zu einem erheblich dickeren Gußgehäuse wird unter dem Einfluß abrasiver Bestandteile das dünnwandige Blechgehäuse eher beschädigt.Centrifugal pump housings in sheet metal construction have a very good strength and, depending on the material used, a high level of resistance to a wide variety of fluids. A disadvantage of these housings made in sheet metal construction is their low resistance to abrasive components in the pumped medium. In contrast to a considerably thicker cast housing, the thin-walled sheet metal housing is rather damaged under the influence of abrasive components.

Ein dem Oberbegriff entsprechendes Blechgehäuse ist durch die DE-A 35 17 498 bekannt. Das Gehäuse weist an seinem äußeren Umfang eine Öffnung auf, in die ein Druckstutzen eingepaßt ist. Der vom Druckstutzen gebildete sogenannte Sporn, der den Eintritt des Fördermediums vom Ringraum in den Druckstutzen unterstützt, kann hierbei mit dem Ringraum bündig ausgebildet sein oder in den Ringraum hineinragen. Bei der Förderung von Medien mit abrasiven Bestandteilen ist der Sporn sehr verschleißgefährdet.A sheet metal housing corresponding to the preamble is known from DE-A 35 17 498. The housing has an opening on its outer periphery into which a pressure port is fitted. The so-called spur formed by the pressure port, which supports the entry of the medium from the annular space into the pressure port, can be designed flush with the annular space or protrude into the annular space. The spur is very susceptible to wear when conveying media with abrasive components.

Der Erfindung liegt daher die Aufgabe zugrunde, für ein gattungsgemäßes Pumpengehäuse eine Lösung zu entwickeln, mit deren Hilfe bei der Förderung abrasive Bestandteile enthaltender Medien eine Lebensdauer entsprechend einem Gußgehäuse gewährleistet. Die Lösung dieser Aufgabe erfolgt gemäß dem kennzeichnenden Teil des Hauptanspruches. Als besonders verschleißgefährdend hat sich der Austritt aus dem Ringraum gezeigt, bei welchem eine Strömungsumlenkung in den Druckstutzen erfolgt. Mit Hilfe der erfindungsgemäßen Lösung, bei der der Wirkungsgrad nahezu gleich bleibt, wird die Strömung im Bereich der Austrittsöffnung gewissermaßen zum Mittelpunkt des Gehäuses abgelenkt, um dann anschließend ohne Beschädigung der Austrittsöffnung in den Druckstutzen zu gelangen. Der an der Endkante der Austrittsöffnung angebrachte Vorsprung wirkt gewissermaßen strömungseinleitend in den Druckstutzen, wirkt aber gleichzeitig auch als Verschleißteil und schützt die dünne Gehäusewandung vor Beschädigungen.The invention is therefore based on the object of developing a solution for a generic pump housing, with the aid of which in the conveyance of media containing abrasive components, a service life corresponding to Cast housing guaranteed. This object is achieved in accordance with the characterizing part of the main claim. The exit from the annular space, in which flow is deflected into the pressure port, has been shown to be particularly hazardous to wear. With the help of the solution according to the invention, in which the efficiency remains almost the same, the flow in the area of the outlet opening is deflected to the center of the housing, in order to then get into the pressure port without damaging the outlet opening. The one attached to the end edge of the outlet opening To a certain extent, the protrusion has a flow-introducing effect in the pressure port, but at the same time it also acts as a wearing part and protects the thin housing wall from damage.

Eine Ausgestaltung der Erfindung sieht vor, daß die Länge der Vorsprünge der Breite des Ringraumes entspricht. Je nach Form der Anwendung findenden Austrittsöffnung sowie den Breitenverhältnissen zwischen Ringraum und Austrittsöffnung können sich hierbei die Vorsprünge über die gesamte Länge erstrecken oder mehrere Teile gestaffelt verteilt angeordnet sein. Durch die Vorsprünge werden die abrasiven Bestandteile von der Randzone der Austrittsöffnung entfernt und treten danach frei in den Druckstutzen ein.An embodiment of the invention provides that the length of the projections corresponds to the width of the annular space. Depending on the shape of the outlet opening used and the width ratios between the annular space and the outlet opening, the projections can extend over the entire length or several parts can be staggered. The abrasive components are removed from the edge zone of the outlet opening by the projections and then freely enter the pressure port.

In den Ansprüchen 3 bis 5 sind verschiedene Arten der Vorsprungsgestaltung beschrieben. Bei in das Blechgehäuse eingeprägten Vorsprüngen bewirken außerhalb des Gehäuses angebrachte Auskleidungen der Vorsprünge, daß bei einem Verschleiß derselben das Gehäuse an dieser Stelle nicht undicht wird.In claims 3 to 5 different types of projection design are described. With projections stamped into the sheet metal housing, linings of the projections attached outside the housing ensure that the housing does not leak at this point when the projections wear out.

Gemäß dem im Anspruch 6 angegebenen Verhältnisbereich zwischen Vorsprungshöhe und Ringraumdurchmesser ergeben sich bei guter Schutzwirkung kaum eine bzw. lediglich eine tolerierbare Wirkungsgradeinbuße.According to the ratio range between the projection height and the annulus diameter specified in claim 6, with a good protective effect there is hardly any or only a tolerable loss in efficiency.

Nach der in Anspruch 7 beschriebenen Ausgestaltung ragt ein an der Endkante der Austrittsöffnung angebrachter Vorsprung in den Druckstutzen hinein. An dieser Stelle, die auch als Sporn bezeichnet wird, wirkt der Vorsprung als Verschleißschutz für direkt aufprallende abrasive Teile.According to the embodiment described in claim 7, a projection attached to the end edge of the outlet opening projects into the pressure port. At this point, which is also referred to as the spur, the protrusion acts as wear protection for directly impacting abrasive parts.

Nach einer anderen Ausgestaltung sind mehrere Vorsprünge über den Umfang des Ringraumes verteilt angeordnet. Diese Maßnahme gewährleistet für den Ringraum zwar einen sehr guten Schütz, jedoch treten hierbei deutliche Wirkungsgradeinbußen auf.According to another embodiment, several projections are arranged distributed over the circumference of the annular space. This measure ensures a very good contactor for the annulus, but there are significant losses in efficiency.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Innerhalb eines aus Blech hergestellten Pumpengehäuses (1) befindet sich ein Laufrad (2), wobei zwischen Laufrad und Umfang des Pumpengehäuses ein Ringraum (3) ausgebildet ist. Innerhalb dieses Ringraumes zirkuliert das aus dem Laufrad austretende Fördermedium und verläßt den Ringraum (3) durch eine am Umfang des Pumpengehäuses angebrachte Austrittsöffnung (4), um anschließend in einen Druckstutzen (5) einzutreten. Mit Hilfe des letzteren ist das Pumpengehäuse mit einem Rohrleitungssystem verbunden.An embodiment of the invention is shown in the drawing. An impeller (2) is located within a pump housing (1) made of sheet metal, an annular space (3) being formed between the impeller and the circumference of the pump housing. The pumped medium emerging from the impeller circulates within this annular space and leaves the annular space (3) through an outlet opening (4) provided on the circumference of the pump housing, in order to subsequently enter a pressure port (5). With the help of the latter, the pump housing is connected to a piping system.

In Strömungsrichtung betrachtet sind an der Anfangskante (6) und Endkante (7) der Austrittsöffnung (4) quer zur Strömungsrichtung verlaufende Vorsprünge (8, 9) angeordnet. Diese verhindern, daß im Fördermedium befindliche abrasive Teile beim Austritt aus dem Ringraum die Austrittsöffnung (4) und des nachgeordneten Druckstutzens (5) zerstören. Die Größenordnung des Feststoffgehaltes entspricht hierbei denjenigen Werten, die Pumpenhersteller für Reinwasserpumpen üblicherweise zulassen.When viewed in the flow direction, projections (8, 9) extending transversely to the flow direction are arranged on the start edge (6) and end edge (7) of the outlet opening (4). These prevent abrasive parts in the pumped medium from destroying the outlet opening (4) and the downstream pressure port (5) when they exit the annular space. The magnitude of the solids content corresponds to the values that pump manufacturers usually allow for pure water pumps.

Der Vorsprung (9) besitzt in dem gezeigten Beispiel eine Gestaltung, aufgrund derer er sich noch in die Austrittsöffnung (4) und den daran anschließenden Druckstutzen (5) hinein erstreckt. Somit wird der sogenannte Gehäusesporn (10) vor einem direkten Angriff der abrasiven Bestandteile geschützt. Die Höhe (H) der Vorsprünge wird ausgehend vom Innendurchmesser (D) des Gehäuses (1) ermittelt. Je geringer die Höhe der Vorsprünge (8, 9), desto unwesentlicher ist deren Einfluß auf den Pumpenwirkungsgrad.In the example shown, the projection (9) has a design on the basis of which it still extends into the outlet opening (4) and the pressure connection (5) adjoining it. The so-called housing spur (10) is thus protected against direct attack by the abrasive components. The height (H) of the projections is determined on the basis of the inside diameter (D) of the housing (1). The lower the height of the projections (8, 9), the less important is their influence on the pump efficiency.

Claims (8)

  1. A centrifugal pump housing constructed of sheet metal, comprising an impeller arranged in said housing so as to define an annular space between it and the housing, said housing having an outlet port at the periphery of the annular space leading into an outlet pipe, characterized in that upstream and downstream edges (6 and 7) of the outlet port (4) are provided with at least two or more projections (8 and 9) extending into the annular space (3), said
       projections (8 and 9) extending across the direction of flow.
  2. The centrifugal pump housing as claimed in claim 1, characterized in that the length of the projections (8 and 9) is equal to the width of the annular space (3).
  3. The centrifugal pump housing as claimed in claim 1 and claim 2, characterized in that the projections (8 and 9) are constituted by components inserted into the annular space (3) and secured in the said space.
  4. The centrifugal pump housing as claimed in claim 1 and claim 2, characterized in that the projections (8 and 9) are constituted by embossed structures extending into the annular space (3).
  5. The centrifugal pump housing as claimed in claim 4, characterized in that the embossed structures on the outer side of the housing are provided with covers.
  6. The centrifugal pump housing as claimed in any one of the preceding claims 1 through 5, characterized in that the ratio between the height (H) of the projections and the diameter of the annular space (D) is between 0.01 and 0.04.
  7. The centrifugal pump housing as claimed in any one of the preceding claims 1 through 6, characterized in that a projection (9) arranged on the downstream edge (7) of the outlet port (4) extends into the outlet port (4) and an outlet pipe (5) connected therewith.
  8. The centrifugal pump housing as claimed in any one of the preceding claims 1 through 7, characterized in that a plurality of projections is distributed over the periphery of the housing (1) of the annular space.
EP90912183A 1989-09-07 1990-08-20 Sheet metal pump casing Expired - Lifetime EP0490908B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3929758 1989-09-07
DE3929758A DE3929758C2 (en) 1989-09-07 1989-09-07 Centrifugal pump housing in sheet metal construction
PCT/EP1990/001373 WO1991003649A1 (en) 1989-09-07 1990-08-20 Sheet metal pump casing

Publications (2)

Publication Number Publication Date
EP0490908A1 EP0490908A1 (en) 1992-06-24
EP0490908B1 true EP0490908B1 (en) 1995-05-31

Family

ID=6388838

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90912183A Expired - Lifetime EP0490908B1 (en) 1989-09-07 1990-08-20 Sheet metal pump casing

Country Status (10)

Country Link
US (1) US5228831A (en)
EP (1) EP0490908B1 (en)
JP (1) JPH0647998B2 (en)
CN (1) CN1022260C (en)
AT (1) ATE123329T1 (en)
CA (1) CA2066434C (en)
DD (1) DD300241A5 (en)
DE (2) DE3929758C2 (en)
MX (1) MX172517B (en)
WO (1) WO1991003649A1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239071C2 (en) * 1992-11-20 1997-01-30 Grundfos As Submersible pump unit
CA2146816A1 (en) 1994-04-22 1995-10-23 Joachim E. Klee Process and composition for preparing a dental polymer product
JP3524674B2 (en) 1995-11-24 2004-05-10 東レ・ダウコーニング・シリコーン株式会社 Organopolysiloxane composition and method for producing the same
US6146092A (en) * 1998-07-13 2000-11-14 Ford Motor Company Centrifugal blower assembly with a diffuser
NO319000B1 (en) * 2000-03-01 2005-06-06 Small Turbine Partner As Radial Water Turbine
US20030039541A1 (en) * 2001-08-20 2003-02-27 Xerox Corporation Blower noise reducing device and a blower having same
US6988870B2 (en) * 2004-01-27 2006-01-24 Weir Slurry Group, Inc. Casing for a centrifugal pump
TWI257836B (en) * 2004-04-23 2006-07-01 Quanta Comp Inc Turbulent blower
US8747062B2 (en) * 2008-06-06 2014-06-10 Weir Minerals Australia Ltd. Pump casing
US9334876B2 (en) 2011-04-12 2016-05-10 Thermo Neslab Inc. Pump casing and related apparatus and methods
DE102015007100A1 (en) * 2015-06-08 2016-12-08 Gea Tuchenhagen Gmbh Self-priming pump aggregation
JP6909069B2 (en) * 2017-06-20 2021-07-28 株式会社日本クライメイトシステムズ Blower for vehicle air conditioner
DE102017223602A1 (en) * 2017-12-21 2019-08-01 KSB SE & Co. KGaA Centrifugal pump with cast component
DE102018218989A1 (en) * 2018-11-07 2020-05-07 KSB SE & Co. KGaA Jacket pump

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US893113A (en) * 1906-07-17 1908-07-14 John Alonzo Traylor Packing-ring for rotary pumps.
DE569707C (en) * 1931-04-17 1933-02-07 Ton & Steinzeug Werke Akt Ges Centrifugal pump housing for the installation of vane wheels of different diameters
US1914919A (en) * 1931-10-30 1933-06-20 Allis Chalmers Mfg Co Centrifugal pump
DE1158841B (en) * 1959-06-10 1963-12-05 M U K H Schreiner Saugbagger U Pump for pumping solid-water mixtures with exchangeable inner housing
CH503907A (en) * 1968-07-13 1971-02-28 Siemens Ag Device for the automatic prevention of the liquid pumping of a centrifugal pump when running backwards
DE1728158A1 (en) * 1968-09-03 1972-03-09 Siemens Elektrogeraete Gmbh Cross flow blower
US3647314A (en) * 1970-04-08 1972-03-07 Gen Electric Centrifugal pump
FR2264204B1 (en) * 1974-03-11 1978-11-10 Mpi Sa Material Processing Int
US4076450A (en) * 1976-01-14 1978-02-28 United Centrifugal Pumps Double volute pump with replaceable lips
GB1558834A (en) * 1977-12-19 1980-01-09 Hall J K H Repair of metallic components
FR2413571A1 (en) * 1977-12-30 1979-07-27 Lab Centrifugal pump or compressor - has nozzles to direct fluid stream tangentially to volute outer casing to prevent eddy formation
SU1016563A1 (en) * 1981-08-19 1983-05-07 Днепропетровский Ордена Трудового Красного Знамени Металлургический Институт Centrifugal suction dredge
DE3323167A1 (en) * 1983-06-28 1985-01-03 Soudbrase-Schweißtechnik GmbH, 7500 Karlsruhe Process for the production and repair of pump housings for pumps for delivering material containing sand and gravel, and pumps of this kind
NZ211792A (en) * 1984-04-18 1986-09-10 Warman Int Ltd Centrifugal pump casing
DE3517498C3 (en) * 1985-05-15 1993-12-02 Klein Schanzlin & Becker Ag Centrifugal pump housing
US4789301A (en) * 1986-03-27 1988-12-06 Goulds Pumps, Incorporated Low specific speed pump casing construction

Also Published As

Publication number Publication date
DD300241A5 (en) 1992-05-27
CN1050079A (en) 1991-03-20
US5228831A (en) 1993-07-20
CA2066434A1 (en) 1991-03-08
JPH04503848A (en) 1992-07-09
ATE123329T1 (en) 1995-06-15
DE59009190D1 (en) 1995-07-06
MX172517B (en) 1993-12-16
JPH0647998B2 (en) 1994-06-22
WO1991003649A1 (en) 1991-03-21
CA2066434C (en) 1999-10-05
CN1022260C (en) 1993-09-29
EP0490908A1 (en) 1992-06-24
DE3929758C2 (en) 1994-11-17
DE3929758A1 (en) 1991-03-21

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