WO1995019503A1 - Sheet-metal centrifugal pump impeller with discharge apertures - Google Patents

Sheet-metal centrifugal pump impeller with discharge apertures Download PDF

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Publication number
WO1995019503A1
WO1995019503A1 PCT/EP1995/000016 EP9500016W WO9519503A1 WO 1995019503 A1 WO1995019503 A1 WO 1995019503A1 EP 9500016 W EP9500016 W EP 9500016W WO 9519503 A1 WO9519503 A1 WO 9519503A1
Authority
WO
WIPO (PCT)
Prior art keywords
centrifugal pump
pocket
pump impeller
impeller
sheet metal
Prior art date
Application number
PCT/EP1995/000016
Other languages
German (de)
French (fr)
Inventor
Christoph Jäger
Original Assignee
Ksb Aktiengesellschaft
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 Ksb Aktiengesellschaft filed Critical Ksb Aktiengesellschaft
Priority to DE59504143T priority Critical patent/DE59504143D1/en
Priority to EP95906291A priority patent/EP0739452B1/en
Priority to DK95906291T priority patent/DK0739452T3/en
Publication of WO1995019503A1 publication Critical patent/WO1995019503A1/en

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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer

Definitions

  • Centrifugal pump impeller made of sheet metal equipped with relief openings
  • the invention relates to a centrifugal pump impeller formed from sheet metal, which has relief openings arranged in the pressure-side cover disk.
  • the object on which the invention is based is to create a centrifugal pump impeller made of sheet metal, the relief openings of which can be produced with little effort direct the relief flow in a direction which has little effect on the flow in the impeller inlet.
  • the pockets can be shaped in a simple manner, optionally simultaneously with one or more further shaping measures for producing the impeller, accomplish.
  • the individual pocket can be formed by a bulge embossed into the cover plate from only one side or by two bulges lying opposite one another. The opening located at the raised end of a bulge or between two bulges can already arise when a pocket is formed, so that a further step is not necessary for this.
  • Fig. 1 is a partial view of a centrifugal pump impeller according to the invention shown in section, and in
  • FIG. 2 is a plan view of a relief opening of the impeller of FIG. 1, shown as a detail.
  • the centrifugal pump impeller 1 made of sheet metal is arranged with a hub 2 on a shaft, not shown.
  • the centrifugal pump impeller 1 has several over its circumference evenly distributed impeller blades 3, which are arranged between a front, suction-side cover plate 4 and a rear, pressure-side cover plate 5.
  • a plurality of pockets 6 Arranged in the pressure-side cover plate 5 are a plurality of pockets 6 distributed uniformly over the circumference, each of which is formed by two bulges 7 and 8 pressed into the cover plate 5 in the opposite direction.
  • the connection which is initially present between the bulges 7 and 8 is torn open, as a result of which an opening 9 is created.
  • the pocket 6 and the opening 9 are aligned so that the relief current flowing from the hub space 10 into the impeller inlet 11, shown here by arrow 12, has approximately the same direction as the main flow symbolized by an arrow 13 at the impeller inlet 11.
  • such a pocket can also be formed by a single bulge 7 or 8, each of which has the same shaping direction, as shown here.

Landscapes

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

Abstract

The object of the invention is a sheet-metal centrifugal pump impeller (1) with discharge apertures in the cover disc (5) on the pressure side formed by an open pocket (6) made in the sheet metal of the cover disc (5), in which such a pocket (6) and its aperture (9) are formed in such a way as to direct the discharge flow (12) in approximately the same direction as the main flow (13).

Description

Beschreibung description
Mit Entlastungsöffnungen ausgestattetes Kreiselpumpenlaufrad aus BlechCentrifugal pump impeller made of sheet metal equipped with relief openings
Gegenstand der Erfindung ist ein aus Blech geformtes Kreiselpumpenlaufrad, welches in der druckseitigen Deckscheibe angeordnete Entlastungsöffnungen besitzt.The invention relates to a centrifugal pump impeller formed from sheet metal, which has relief openings arranged in the pressure-side cover disk.
Bisher wurden die Entlastungsöffnungen, die dem Ausgleich des Axialschubes des Laufrades dienen, bei Blechlaufrädern durch Ausstanzen in der druckseitigen Deckscheibe angebracht. Der Entlastungsstrom, der von dem auf der Deckscheibe des Laufrades gelegenen Nabenraum über die Entlastungsöffnungen in den Laufradeintritt gelangte, wurde hierbei in eine der Läufradströmung entgegengesetzte Richtung gelenkt oder er traf die Laufradströmung in einem ungünstigen Winkel. Dies beeinträchtigte die hydraulische Leistung des Laufrades, vor allem dessen Saugverhalten, und verminderte den Wirkungsgrad der Kreiselpumpe.So far, the relief openings, which serve to compensate for the axial thrust of the impeller, have been made in sheet metal impellers by punching them out in the pressure-side cover disk. The relief flow, which reached the impeller inlet from the hub space on the impeller cover plate, was directed in a direction opposite to the impeller flow or it hit the impeller flow at an unfavorable angle. This affected the hydraulic performance of the impeller, especially its suction behavior, and reduced the efficiency of the centrifugal pump.
Die der Erfindung zugrundeliegende Aufgabe besteht darin, ein Kreiselpumpenlaufrad aus Blech zu schaffen, dessen mit geringem Aufwand zu fertigende Entlastungsöffnungen die Entlastungsströmung in eine die Strömung im Laufradeintritt wenig beeinträchtigende Richtung lenken.The object on which the invention is based is to create a centrifugal pump impeller made of sheet metal, the relief openings of which can be produced with little effort direct the relief flow in a direction which has little effect on the flow in the impeller inlet.
Die gestellte Aufgabe wird gelöst durch ein dem Anspruch 1 entsprechendes Laufrad.The object is achieved by an impeller corresponding to claim 1.
Die Ausformung der Taschen läßt sich auf einfache Weise, gegebenenfalls gleichzeitig mit einer oder mehreren weiteren Formgebungsmaßnahmen zur Herstellung des Laufrades, bewerkstelligen. Dabei kann die einzelne Tasche durch eine nur von einer Seite in die Deckscheibe geprägte Ausbuchtung oder durch zwei einander gegenüberliegende Ausbuchtungen gebildet werden. Die am erhöhten Ende einer Ausbuchtung bzw. zwischen zwei Ausbuchtungen gelegene Öffnung kann bereits bei der Ausformung einer Tasche entstehen, so daß ein weiterer Arbeitsschritt hierfür nicht notwendig ist.The pockets can be shaped in a simple manner, optionally simultaneously with one or more further shaping measures for producing the impeller, accomplish. The individual pocket can be formed by a bulge embossed into the cover plate from only one side or by two bulges lying opposite one another. The opening located at the raised end of a bulge or between two bulges can already arise when a pocket is formed, so that a further step is not necessary for this.
Für gegossene Kreiselpumpenlaufräder ist es bereits bekannt, Entlastungskanäle so anzuordnen, daß deren Austritt in das Laufradinnere an einer für eine gewünschte Funktion günstigen Stelle und mit einer für die Laufradströmung günstigen Richtung erfolgt. Beispiele hierfür sind die FR-PS 972 528, bei der die jeweils mit einer Knickung verlaufenden Entlastungskanäle einen nahezu parallel zur Laufradströmung gerichteten Auslaß besitzen, und die DE-PS 518 179, bei welcher die Entlastungskanäle auf der Saugseite der Laufradschaufeln unmittelbar hinter den Eintrittskanten ausmünden. Derartige Kanäle sind allerdings nur in einem Vollmaterial, nicht aber in Blech zu verwirklichen. Gegenüber diesen Lösungen bietet aber die erfindungsgemäße, für Blechlaufräder geltende Lösung den Vorteil eines geringeren Herstellungsaufwandes.For casted centrifugal pump impellers, it is already known to arrange relief channels in such a way that their exit into the interior of the impeller takes place at a point which is favorable for a desired function and with a direction which is favorable for the impeller flow. Examples of this are FR-PS 972 528, in which the relief channels each running with a bend have an outlet directed almost parallel to the impeller flow, and DE-PS 518 179, in which the relief channels open on the suction side of the impeller blades immediately behind the leading edges . However, such channels can only be realized in a solid material, but not in sheet metal. Compared to these solutions, however, the solution according to the invention, which applies to sheet metal impellers, offers the advantage of a lower manufacturing outlay.
Anhand eines Ausführungsbeispiels wird die Erfindung näher erläutert. Die Zeichnung zeigt inThe invention is explained in more detail using an exemplary embodiment. The drawing shows in
Fig. 1 die Teilansicht eines im Schnitt dargestellten erfindungsgemäßen Kreiselpumpenlaufrades, und inFig. 1 is a partial view of a centrifugal pump impeller according to the invention shown in section, and in
Fig. 2 eine Draufsicht auf eine als Einzelheit dargestellte Entlastungsöffnung des Laufrades der Fig. 1.2 is a plan view of a relief opening of the impeller of FIG. 1, shown as a detail.
Das aus Blech bestehende Kreiselpumpenlaufrad 1 ist mit einer Nabe 2 auf einer nicht dargestellten Welle angeordnet. Das Kreiselpumpenlaufrad 1 besitzt mehrere über seinen Umfang gleichmäßig verteilte Laufradschaufeln 3, die zwischen einer vorderen, saugseitigen Deckscheibe 4 und einer hinteren, druckseitigen Deckscheibe 5 angeordnet sind.The centrifugal pump impeller 1 made of sheet metal is arranged with a hub 2 on a shaft, not shown. The centrifugal pump impeller 1 has several over its circumference evenly distributed impeller blades 3, which are arranged between a front, suction-side cover plate 4 and a rear, pressure-side cover plate 5.
In der druckseitigen Deckscheibe 5 sind mehrere gleichmäßig über den Umfang verteilte Taschen 6 angeordnet, die jeweils durch zwei mit entgegengesetzter Richtung in die Deckscheibe 5 gepreßte Ausbuchtungen 7 und 8 gebildet werden. Durch den Preßvorgang wird die zunächst zwischen den Ausbuchtungen 7 und 8 vorhandene Verbindung aufgerissen, wodurch eine Öffnung 9 entsteht. Die Tasche 6 und die Öffnung 9 sind so ausgerichtet, daß der vom Nabenraum 10 in den Laufradeintritt 11 fließende Entlastungsstrom, hier durch Pfeil 12 dargestellt, etwa die gleiche Richtung hat wie die durch einen Pfeil 13 symbolisierte Hauptströmung am Laufradeintritt 11.Arranged in the pressure-side cover plate 5 are a plurality of pockets 6 distributed uniformly over the circumference, each of which is formed by two bulges 7 and 8 pressed into the cover plate 5 in the opposite direction. As a result of the pressing process, the connection which is initially present between the bulges 7 and 8 is torn open, as a result of which an opening 9 is created. The pocket 6 and the opening 9 are aligned so that the relief current flowing from the hub space 10 into the impeller inlet 11, shown here by arrow 12, has approximately the same direction as the main flow symbolized by an arrow 13 at the impeller inlet 11.
Abweichend von der hier dargestellten Form der Tasche 6 mit zwei Ausbuchtungen 7 und 8, kann eine solche Tasche auch durch eine einzige Ausbuchtung 7 oder 8 gebildet werden, die jeweils die gleiche Ausformrichtung besäße, wie hier dargestellt. Deviating from the shape of the pocket 6 shown here with two bulges 7 and 8, such a pocket can also be formed by a single bulge 7 or 8, each of which has the same shaping direction, as shown here.

Claims

Patentansprüche claims
1. Kreiselpumpenlaufrad (1) aus Blech, welches in der druckseitigen Deckscheibe (5) angeordnete Entlastungs¬ öffnungen besitzt, die jeweils durch eine in das Blech der Deckscheibe (5) geformte offene Tasche (6) gebildet werden, wobei eine solche Tasche (6) und deren Öffnung (9) einen Verlauf besitzen, der den Entlastungsstrom (12) in eine in etwa mit dem Hauptstrom (13) gleichlaufende Richtung lenkt.1. Centrifugal pump impeller (1) made of sheet metal, which has relief openings arranged in the pressure-side cover disk (5), each of which is formed by an open pocket (6) formed in the sheet metal of the cover disk (5), such a pocket (6 ) and their opening (9) have a course which directs the relief flow (12) in a direction approximately the same as the main flow (13).
2. Kreiselpumpenlaufrad nach Anspruch 1, bei welchem eine als Entlastungsöffnung dienende Tasche (6) durch eine von einer Seite in das Blech der Deckscheibe (5) geformte Ausbuchtung (7 oder 8) gebildet wird.2. Centrifugal pump impeller according to Claim 1, in which a pocket (6) serving as a relief opening is formed by a bulge (7 or 8) formed from one side into the sheet metal of the cover plate (5).
3. Kreiselpumpenlaufrad nach Anspruch 1, bei welchem eine als Entlastungsöffnung dienende Tasche (6) durch zwei, von beiden Seiten in das Blech der Deckscheibe (5) geformte Ausbuchtungen (7 und 8) gebildet wird, wobei sich die Öffnung (9) der Tasche (6) zwischen den beiden Ausbuchtungen (7, 8) befindet.3. Centrifugal pump impeller according to claim 1, in which a pocket serving as a relief opening (6) is formed by two bulges (7 and 8) formed from both sides in the sheet metal of the cover plate (5), the opening (9) of the pocket (6) between the two bulges (7, 8).
4. Verfahren zur Herstellung eines Kreiselpumpenlaufrades nach Anspruch 1 oder einem der folgenden Ansprüche, dadurch gekennzeichnet, daß die Öffnung (9) der Tasche (6) während der Ausformung von einer oder zwei Ausbuchtungen (7, 8) ohne zusätzlichen Arbeitsgang entsteht. 4. A method for producing a centrifugal pump impeller according to claim 1 or one of the following claims, characterized in that the opening (9) of the pocket (6) during the formation of one or two bulges (7, 8) without an additional operation.
PCT/EP1995/000016 1994-01-12 1995-01-04 Sheet-metal centrifugal pump impeller with discharge apertures WO1995019503A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE59504143T DE59504143D1 (en) 1994-01-12 1995-01-04 SHEET PUMP PUMP WHEEL EQUIPPED WITH RELIEF OPENINGS
EP95906291A EP0739452B1 (en) 1994-01-12 1995-01-04 Sheet-metal centrifugal pump impeller with discharge apertures
DK95906291T DK0739452T3 (en) 1994-01-12 1995-01-04 Plate centrifugal pump rotor with relief openings

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4400633A DE4400633A1 (en) 1994-01-12 1994-01-12 Centrifugal pump impeller made of sheet metal equipped with relief openings
DEP4400633.0 1994-01-12

Publications (1)

Publication Number Publication Date
WO1995019503A1 true WO1995019503A1 (en) 1995-07-20

Family

ID=6507746

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1995/000016 WO1995019503A1 (en) 1994-01-12 1995-01-04 Sheet-metal centrifugal pump impeller with discharge apertures

Country Status (4)

Country Link
EP (1) EP0739452B1 (en)
DE (2) DE4400633A1 (en)
DK (1) DK0739452T3 (en)
WO (1) WO1995019503A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8398375B2 (en) 2008-03-26 2013-03-19 Hitachi Plant Technologies, Ltd. Impeller
US9556876B2 (en) 2012-01-23 2017-01-31 Mitsubishi Heavy Industries, Ltd. Centrifugal fluid machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140108389A (en) * 2013-02-26 2014-09-11 현대중공업 주식회사 Centrifugal pump having balancing holes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR972528A (en) * 1948-05-05 1951-01-31 Cie Des Surchauffeurs Improvements to centrifugal pumps
US3632220A (en) * 1970-08-27 1972-01-04 Chrysler Corp Coolant pump
WO1986006799A1 (en) * 1985-05-15 1986-11-20 Klein, Schanzlin & Becker Aktiengesellschaft Impeller wheels

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE518179C (en) * 1929-09-20 1931-02-12 Hans Reinecke Relief of the spaces within the rear sealing rings of the running wheels of rotating hydraulic machines
JPH05288803A (en) * 1992-04-14 1993-11-05 Fujitsu Ltd Ic tray

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR972528A (en) * 1948-05-05 1951-01-31 Cie Des Surchauffeurs Improvements to centrifugal pumps
US3632220A (en) * 1970-08-27 1972-01-04 Chrysler Corp Coolant pump
WO1986006799A1 (en) * 1985-05-15 1986-11-20 Klein, Schanzlin & Becker Aktiengesellschaft Impeller wheels

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8398375B2 (en) 2008-03-26 2013-03-19 Hitachi Plant Technologies, Ltd. Impeller
US9556876B2 (en) 2012-01-23 2017-01-31 Mitsubishi Heavy Industries, Ltd. Centrifugal fluid machine

Also Published As

Publication number Publication date
EP0739452B1 (en) 1998-11-04
DE4400633A1 (en) 1995-07-13
DE59504143D1 (en) 1998-12-10
EP0739452A1 (en) 1996-10-30
DK0739452T3 (en) 1999-07-19

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