EP0741840B1 - Impeller wheel - Google Patents

Impeller wheel Download PDF

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Publication number
EP0741840B1
EP0741840B1 EP95905125A EP95905125A EP0741840B1 EP 0741840 B1 EP0741840 B1 EP 0741840B1 EP 95905125 A EP95905125 A EP 95905125A EP 95905125 A EP95905125 A EP 95905125A EP 0741840 B1 EP0741840 B1 EP 0741840B1
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EP
European Patent Office
Prior art keywords
impeller
blade
vanes
gap
area
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
EP95905125A
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German (de)
French (fr)
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EP0741840A1 (en
Inventor
Oliver Schuster
Kurt Seitz
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
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KSB AG
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Publication date
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Publication of EP0741840A1 publication Critical patent/EP0741840A1/en
Application granted granted Critical
Publication of EP0741840B1 publication Critical patent/EP0741840B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a closed-type impeller for pumps, which consists of several sheet metal parts is welded together, their as Individual parts of blades with the cover disks attached to them are welded, the blades are not attached over their entire length.
  • Impellers are known from EP-B 0 283 825 and SU-A 130 348. Their impellers are welded together by so-called fillet welds, i.e. H. on two components standing one on the other at an angle in the joint area welding electrodes produced the fillet weld.
  • the Impellers so to speak, put together from the inside and this requires a good one Accessibility to the welding point. With a usually curved and covered blade channel, this is easy only in its start and end area is possible. In contrast, however, exist in the middle area of the blade channel such limited space that there is a welding of the blades with the cover washers is very difficult, at least if there is a vane channel is closed by a cover plate to be attached to it.
  • JP-A-59-211 795 shows a cast impeller.
  • In the transition between Cover plate and impeller inlet area are slots that can be retrofitted Removal of voltage peaks arranged. These voltage peaks arise usually in cast construction in the transition between thick-walled Material accumulations and thin-walled components. In the wheel shown further tensions arise from the usual inclination of the Shovels.
  • the invention is therefore based on the problem for highly loaded impellers composite design to develop a safe blade attachment.
  • This Problem is solved in that each blade with continuous welds is connected, an open and flushable in the entry area of the impeller Gap between the suction and / or pressure side cover plate and the blades remains.
  • a result is obtained in the impeller inlet area Blade elasticity.
  • the middle and outer ones which are more heavily loaded due to the centrifugal forces
  • the area of the blade channel has continuous weld seams, to be precise especially in the difficult to access middle bucket area. So that is Production of a very resilient piece assembled from individual parts Impeller possible, its strength values comparable with corresponding cast wheels are.
  • An additional advantage is that impellers created in this way readily by means of diameter reduction different system conditions are adaptable. In contrast to the known solutions with interrupted weld seam, this is without subsequent Welding possible without problems.
  • they are a gap in the entry area Bucket parts having a cover disk are plastically deformable.
  • This in the field of existing suction and / or pressure-side cover disc allows that with With the help of a forming tool for the respective purpose of the Impeller suitable position of the blade entry area can be generated. This possibility therefore allows both an angle change of the Blade leading edges as well as a subsequent change in shape of the entire Blade entry area.
  • the blades can also be positioned in the cover disks.
  • One or both Impeller cover plates can match the blade contour Have recesses.
  • the blades can then be fixed in place during assembly and then welded from the outside. This can be done with or without With the help of welding additives.
  • the impeller 1 has a hub 2, which has a cover disk 3 on the pressure side connected is. Between the pressure side cover plate 3 and a suction side Cover plate 4 there are several blades 5. With the help of a corresponding The device allows the parts to be positioned safely and from the outside onto the Weld cover plates 3, 4 acting welding devices 6, 7. in the Entry area of the impeller remain between the cover disks 3, 4 and Scoops 5 column 8, 9.
  • the entry area points with its curved Geometry has an elasticity during which the centrifugal forces put a higher load on it middle and outer blade area homogeneous and high quality, has continuous welded connections. Even in the usual way inaccessible middle blade area.
  • the weld connection is made here using known welding processes.
  • the blades 5 positioning recesses be attachable. But it is just as possible during the welding process to hold the blades in suitable devices.
  • the cover plates 3, 4 with the Edges of the blades 5 connected By means of the outside on that Impeller welding process, the cover plates 3, 4 with the Edges of the blades 5 connected.
  • the column is a significant advantage in that it offers the possibility of subsequent shaping of the blade beginnings or the blade entry areas given is.
  • a suitable tool With the help of a suitable tool, the one for Suitable blade course for the respective intended use of the impeller generate by forming. Depending on the shape of the blade used, only one can be used Gap to be provided. This would then only be in the area of suction or pressure-side cover plate available.
  • the inlet area of the blades can therefore be used for a desired pump size fluidically optimized. This is particularly interesting if Buckets for several sizes can be made uniform.

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

Abstract

The invention concerns an impeller wheel (1) made up of shaped metal-plate components, the impeller vanes (5) being fixed to the cover discs (3, 4) by continuous welds located outside the vane channels. Only near the impeller-wheel entry is a gap (8, 9) left between the vanes (5) and one or both cover discs (3, 4) on the delivery and/or aspiration side.

Description

Die Erfindung betrifft ein Laufrad geschlossener Bauart für Pumpen, welches aus mehreren Blechformteilen schweißtechnisch zusammengefügt ist, deren als Einzelteile ausgebildete Schaufeln mit den daran anliegenden Deckscheiben verschweißt sind, wobei die Schaufeln nicht über ihre ganze Länge befestigt sind.The invention relates to a closed-type impeller for pumps, which consists of several sheet metal parts is welded together, their as Individual parts of blades with the cover disks attached to them are welded, the blades are not attached over their entire length.

Derartige Laufräder sind aus der EP-B 0 283 825 und der SU-A 130 348 bekannt. Deren Laufräder werden durch sogenannte Kehlnähte zusammengeschweißt, d. h. an zwei im Winkel aufeinanderstehenden Bauteilen wird in dem Stoßbereich mittels herangeführter Schweißelektroden die Kehlnaht erzeugt. Dabei werden die Laufräder gewissermaßen von innen zusammengefügt und dies erfordert eine gute Zugänglichkeit zu der Schweißstelle. Bei einem üblicherweise gebogenen und abgedeckten Schaufelkanal ist dies nur in dessen Anfangs- und Endbereich leicht möglich ist. Dagegen existieren jedoch im mittleren Bereich des Schaufelkanals derart beengte räumliche Verhältnisse, daß dort eine Verschweißung der Schaufeln mit den Deckscheiben sehr schwierig ist, zumindest dann, wenn ein Schaufelkanal durch eine daran anzubringende Deckscheibe geschlossen wird. Im Stand der Technik wurde aus dieser Not eine Tugend gemacht, indem die unzugänglichen Stellen nicht verschweißt werden und statt dessen ein Spalt verbleibt, durch den das Fördermedium zirkulieren kann. Damit sollen an den unzugänglichen Stellen des Laufrades mit fehlender Verbindung zwischen Schaufel und Deckscheibe gleiche Korrosionsbedingungen geschaffen werden, indem stattdessen spül- oder reinigbare Spalte benutzt werden, in denen sich Produkte des Fördermediums nicht festsetzen können. Such impellers are known from EP-B 0 283 825 and SU-A 130 348. Their impellers are welded together by so-called fillet welds, i.e. H. on two components standing one on the other at an angle in the joint area welding electrodes produced the fillet weld. The Impellers, so to speak, put together from the inside and this requires a good one Accessibility to the welding point. With a usually curved and covered blade channel, this is easy only in its start and end area is possible. In contrast, however, exist in the middle area of the blade channel such limited space that there is a welding of the blades with the cover washers is very difficult, at least if there is a vane channel is closed by a cover plate to be attached to it. In the state of the Technology was made a virtue of this hardship by making the inaccessible Places are not welded and instead a gap remains through which the Pumped medium can circulate. This is supposed to be in the inaccessible places of Impeller with no connection between the blade and the cover plate is the same Corrosion conditions are created by using rinsable or cleanable instead Columns are used, in which products of the medium are not stuck can.

Durch die DE-PS 509 458, die ein zusammengebautes Laufrad beschreibt, ist es bekannt, im Eintrittsbereich des Schaufelkanals einen Spalt zwischen einer abnehmbaren Laufradseitenwand und den gegenüberliegenden Schaufelkanten auszubilden. Der im Eintrittsbereich der Schaufelkanäle nunmehr mögliche Druckausgleich zwischen den Schaufelkanälen soll der Vermeidung von Schaum- und Dampfblasen dienen. Gerade bei der Förderung von zersetzenden Flüssigkeiten, wie z. B. Milch, wird auf eine Durchspülung bzw. Zugänglichkeit derartiger Spalte besonders Wert gelegt. Aus diesem Grunde verwendet dieser vorbekannte Stand der Technik neben den durchspülbaren Spalten noch die zusätzlich abnehmbare Laufradseitenwand bzw. Deckscheibe, um eine sichere Reinigung des Laufrades zu ermöglichen.By DE-PS 509 458, which describes an assembled impeller, it is known, in the entry region of the blade channel a gap between one removable impeller side wall and the opposite blade edges to train. The one that is now possible in the entry area of the blade channels Pressure equalization between the blade channels is to avoid foam and steam bubbles serve. Especially when promoting decomposition Liquids such as B. milk, is on a flushing or accessibility such a column is particularly important. For this reason, this uses known prior art in addition to the flushable columns additionally removable impeller side wall or cover plate to ensure a safe To allow cleaning of the impeller.

Bei Kreiselpumpenlaufrädern, die mit Hilfe anderer Schweißverfahren zusammengefügt werden, ergeben sich völlig andere Problemstellungen. Sind es beispielsweise niedrig belastete Laufräder von Heizungsumwälzpumpen, so genügt dort eine Verbindung mittels Punktschweißverbindungen. Jedoch bei Laufrädern, die sehr hohen Belastungen ausgesetzt sind, wird eine vollständige und durchgehende Schweißnaht zwischen den Schaufeln und den Deckscheiben angestrebt, um die großen dynamischen Belastungen aufnehmen zu können. Aus diesem Grunde muß die Schweißnaht sehr homogen und qualitativ hochwertig sein, ohne Risse und Spalte, um eine hohe Betriebssicherheit zu gewährleisten. Dies verhindert zusätzlich eine Ablagerung von Verunreinigungen und erweitert somit das Einsatzgebiet des Laufrades.For centrifugal pump impellers that are made using other welding processes completely different problems arise. They are For example, low-load impellers of heating circulating pumps are sufficient there a connection by means of spot welding connections. However, with impellers that exposed to very high loads will be a complete and continuous Aimed at weld between the blades and the shrouds to be able to absorb large dynamic loads. For this reason the weld seam should be very homogeneous and of high quality, without cracks and Column to ensure high operational safety. This also prevents a deposition of impurities and thus extends the area of application of the Impeller.

Die JP-A-59-211 795 zeigt ein gegossenes Laufrad. Im Übergang zwischen Deckscheibe und Laufradeintrittsbereich sind nachträglich anbringbare Schlitze zum Abbau von Spannungsspitzen angeordnet. Diese Spannungsspitzen entstehen üblicherweise bei Gußkonstruktion im Übergang zwischen dickwandigen Materialanhäufungen und dünnwandigen Bauteilen. Bei dem gezeigten Laufrad entstehen noch weitere Spannungen durch die übliche Schrägstellung der Schaufeln.JP-A-59-211 795 shows a cast impeller. In the transition between Cover plate and impeller inlet area are slots that can be retrofitted Removal of voltage peaks arranged. These voltage peaks arise usually in cast construction in the transition between thick-walled Material accumulations and thin-walled components. In the wheel shown further tensions arise from the usual inclination of the Shovels.

Der Erfindung liegt daher das Problem zugrunde, für hochbelastete Laufräder zusammengesetzter Bauart eine sichere Schaufelbefestigung zu entwickeln. Dieses Problem wird dadurch gelöst, daß jede Schaufel mit durchgehenden Schweißnähten verbunden ist, wobei im Eintrittsbereich des Laufrades ein offener und spülbarer Spalt zwischen saug- und/oder druckseitiger Deckscheibe und den Schaufeln verbleibt. Mit Hilfe dieser Maßnahme ergibt sich im Laufradeintrittsbereich eine Schaufelelastizität. Der aufgrund der Fliehkräfte höherbelastete mittlere und äußere Bereich des Schaufelkanals weist durchgehende Schweißnähte, und zwar auch gerade im schwer zugänglichen mittleren Schaufelbereich auf. Somit ist die Herstellung eines aus Einzelteilen zusammengefügten, sehr hoch belastbaren Laufrades möglich, dessen Festigkeitswerte vergleichbar mit entsprechend gegossenen Laufrädern sind. Ein zusätzlicher Vorteil besteht auch darin, daß derartig erstellte Laufräder ohne weiteres mittels Durchmesserreduzierung an unterschiedliche Anlagenverhältnisse anpaßbar sind. Im Gegensatz zu den bekannten Lösungen mit unterbrochener Schweißnaht ist dies ohne nachträgliche Schweißung problemlos möglich.The invention is therefore based on the problem for highly loaded impellers composite design to develop a safe blade attachment. This Problem is solved in that each blade with continuous welds is connected, an open and flushable in the entry area of the impeller Gap between the suction and / or pressure side cover plate and the blades remains. With the help of this measure, a result is obtained in the impeller inlet area Blade elasticity. The middle and outer ones, which are more heavily loaded due to the centrifugal forces The area of the blade channel has continuous weld seams, to be precise especially in the difficult to access middle bucket area. So that is Production of a very resilient piece assembled from individual parts Impeller possible, its strength values comparable with corresponding cast wheels are. An additional advantage is that impellers created in this way readily by means of diameter reduction different system conditions are adaptable. In contrast to the known solutions with interrupted weld seam, this is without subsequent Welding possible without problems.

Nach einer Ausgestaltung der Erfindung sind die im Eintrittsbereich einen Spalt zur Deckscheibe aufweisenden Schaufelteile plastisch verformbar. Dieser im Bereich der saug- und/oder druckseitigen Deckscheibe vorhandene Spalt ermöglicht es, daß mit Hilfe eines Umformwerkzeuges die für den jeweiligen Verwendungszweck des Laufrades geeignete Stellung des Schaufeleintrittsbereiches erzeugt werden kann. Diese Möglichkeit erlaubt also sowohl eine Winkelveränderung der Schaufelanströmkanten als auch eine nachträgliche Formänderung des gesamten Schaufeleintrittsbereiches. According to one embodiment of the invention, they are a gap in the entry area Bucket parts having a cover disk are plastically deformable. This in the field of existing suction and / or pressure-side cover disc allows that with With the help of a forming tool for the respective purpose of the Impeller suitable position of the blade entry area can be generated. This possibility therefore allows both an angle change of the Blade leading edges as well as a subsequent change in shape of the entire Blade entry area.

Auch sind die Schaufeln in den Deckscheiben positionierbar. Eine oder beide Laufraddeckscheiben können hierbei der Schaufelkontur entsprechende Ausnehmungen aufweisen. Darin können dann die Schaufeln bei der Montage fixiert und anschließend von außen verschweißt werden. Dies kann mit oder ohne Zuhilfenahme von Schweiß-Zuschlagstoffen erfolgen.The blades can also be positioned in the cover disks. One or both Impeller cover plates can match the blade contour Have recesses. The blades can then be fixed in place during assembly and then welded from the outside. This can be done with or without With the help of welding additives.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is shown in the drawing and is in following described in more detail.

Das Laufrad 1 verfügt über eine Nabe 2, die mit einer druckseitigen Deckscheibe 3 verbunden ist. Zwischen der druckseitigen Deckscheibe 3 und einer saugseitigen Deckscheibe 4 befinden sich mehrere Schaufeln 5. Mit Hilfe einer entsprechenden Vorrichtung lassen sich die Teile sicher positionieren und durch von außen auf die Deckscheiben 3, 4 einwirkende Schweißgeräte 6, 7 verschweißen. Im Eintrittsbereich des Laufrades verbleiben zwischen den Deckscheiben 3, 4 und den Schaufeln 5 Spalte 8, 9. Somit weist der Eintrittsbereich mit seiner gekrümmten Geometrie eine Elastizität auf, während der durch die Fliehkräfte höher belastete mittlere und äußere Schaufelbereich homogene und qualitativ hochwertige, durchgehende Schweißverbindungen aufweist. Und zwar auch im üblicherweise unzugänglichen mittleren Schaufelbereich.The impeller 1 has a hub 2, which has a cover disk 3 on the pressure side connected is. Between the pressure side cover plate 3 and a suction side Cover plate 4 there are several blades 5. With the help of a corresponding The device allows the parts to be positioned safely and from the outside onto the Weld cover plates 3, 4 acting welding devices 6, 7. in the Entry area of the impeller remain between the cover disks 3, 4 and Scoops 5 column 8, 9. Thus, the entry area points with its curved Geometry has an elasticity during which the centrifugal forces put a higher load on it middle and outer blade area homogeneous and high quality, has continuous welded connections. Even in the usual way inaccessible middle blade area.

Die Schweißverbindung erfolgt hier mit bekannten Schweißverfahren. In den Deckscheiben 3, 4 können dabei die Schaufeln 5 positionierende Ausnehmungen anbringbar sein. Es ist aber genauso gut möglich, während des Schweißvorganges die Schaufeln in geeigneten Vorrichtungen zu halten. Mittels dem außen auf das Laufrad einwirkenden Schweißvorgang werden die Deckscheiben 3, 4 mit den Kanten der Schaufeln 5 verbunden. The weld connection is made here using known welding processes. In the Cover disks 3, 4, the blades 5 positioning recesses be attachable. But it is just as possible during the welding process to hold the blades in suitable devices. By means of the outside on that Impeller welding process, the cover plates 3, 4 with the Edges of the blades 5 connected.

In der im strichpunktierten Kreis gezeigten vergrößerten Darstellung eines Schaufelanfanges sind die Spalte 8, 9 im Bereich der Anfänge der Schaufeln 5 deutlich herausgestellt. Deren Abmessungen sind so gewählt, daß sie eine Durchspülung und Reinigung der Spalte ermöglichen.In the enlarged illustration shown in the dash-dotted circle, a The beginning of the blade are the columns 8, 9 in the area of the beginning of the blades 5 clearly highlighted. Their dimensions are chosen so that they are a Allow flushing and cleaning of the gaps.

Einen wesentliche Vorteil bilden die Spalte insofern, als damit die Möglichkeit zur nachträglichen Formung der Schaufelanfänge bzw. der Schaufeleintrittsbereiche gegeben ist. Mit Hilfe eines geeigneten Werkzeuges ließe sich dann der für den jeweiligen Verwendungszweck des Laufrades geeignete Schaufelverlauf umformtechnisch erzeugen. Je nach verwendeter Schaufelform kann auch nur ein Spalt vorgesehen werden. Dieser wäre dann nur im Bereich der saug- oder druckseitigen Deckscheibe vorhanden.The column is a significant advantage in that it offers the possibility of subsequent shaping of the blade beginnings or the blade entry areas given is. With the help of a suitable tool, the one for Suitable blade course for the respective intended use of the impeller generate by forming. Depending on the shape of the blade used, only one can be used Gap to be provided. This would then only be in the area of suction or pressure-side cover plate available.

Der Eintrittsbereich der Schaufeln kann damit für eine gewünschte Pumpenbaugröße strömungstechnisch optimiert werden. Dies ist besonders dann interessant, wenn Schaufeln für mehrere Baugrößen einheitlich ausgeführt werden.The inlet area of the blades can therefore be used for a desired pump size fluidically optimized. This is particularly interesting if Buckets for several sizes can be made uniform.

Claims (2)

  1. Impeller (1) of closed design for pumps, which is joined together by welding from a plurality of sheet-metal shaped parts whose vanes (5) constructed as individual parts are welded to the covering discs (3, 4) which rest against them, the vanes (5) not being attached over their entire length, characterized in that each vane (5) is connected to the covering discs (3, 4) by continuous weld seams, an open and flushable gap (8, 9) remaining between the suction-side and/or discharge-side covering disc and the vanes in the entry region of the impeller.
  2. Impeller according to Claim 1, characterized in that the vane parts (5) having a gap (8, 9) with respect to the covering disc in the entry region are plastically deformable.
EP95905125A 1994-01-28 1995-01-07 Impeller wheel Expired - Lifetime EP0741840B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4402493A DE4402493A1 (en) 1994-01-28 1994-01-28 Wheel
DE4402493 1994-01-28
PCT/EP1995/000050 WO1995020724A1 (en) 1994-01-28 1995-01-07 Impeller wheel

Publications (2)

Publication Number Publication Date
EP0741840A1 EP0741840A1 (en) 1996-11-13
EP0741840B1 true EP0741840B1 (en) 1998-11-04

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ID=6508876

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95905125A Expired - Lifetime EP0741840B1 (en) 1994-01-28 1995-01-07 Impeller wheel

Country Status (6)

Country Link
EP (1) EP0741840B1 (en)
JP (1) JPH09511557A (en)
AT (1) ATE173062T1 (en)
DE (2) DE4402493A1 (en)
DK (1) DK0741840T3 (en)
WO (1) WO1995020724A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103174669A (en) * 2011-12-21 2013-06-26 格兰富控股联合股份公司 Impeller

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Publication number Priority date Publication date Assignee Title
DE19818928A1 (en) * 1998-04-28 1999-11-04 Ksb Ag Welded centrifugal pump rotor
US8141201B2 (en) 2008-02-14 2012-03-27 Panasonic Corporation Electric fan
JP4561852B2 (en) * 2008-03-26 2010-10-13 株式会社日立プラントテクノロジー Impeller
IT1402483B1 (en) * 2010-11-16 2013-09-13 Nuovo Pignone Spa METHODS FOR MANUFACTURING IMPELLERS THAT INCORPORATE FITTING IN DESIRED AREAS
US20130177430A1 (en) * 2012-01-05 2013-07-11 General Electric Company System and method for reducing stress in a rotor
RU180854U1 (en) * 2017-10-19 2018-06-28 Общество с ограниченной ответственностью "Ижнефтепласт" CENTRIFUGAL PUMP DRIVING WHEEL

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DE509458C (en) * 1929-02-23 1930-10-09 Naamlooze Vennootschap Konink Closed impeller for centrifugal pumps, especially for foaming liquids
DE927870C (en) * 1953-03-20 1955-05-20 Siemens Ag Process for the production of curved cover disks from pressed sheet metal for welded pump impellers
SU130348A1 (en) * 1959-11-09 1959-11-30 В.Б. Жилкин Centrifugal pump for aggressive liquids
DK113340B (en) * 1966-08-09 1969-03-10 Grundfos As Flow apparatus, in particular scooters or centrifugal pump guides, and methods of making the same.
FR1533761A (en) * 1967-08-08 1968-07-19 Grundfoss Bjerringbro Pumpefab Improvements to centrifugal pumps
DE2049679A1 (en) * 1970-10-09 1972-04-13 Bosch Gmbh Robert Fan for an electric machine
FR2312671A1 (en) * 1975-05-30 1976-12-24 Creusot Loire PROCESS FOR MAKING A CENTRIFUGAL BLADE WHEEL AND WHEEL OBTAINED BY THIS PROCESS
IT1091876B (en) * 1978-01-12 1985-07-06 Nuovo Pignone Spa METHOD FOR THE ELECTRIC ARC WELDING OF THE BLADES TO THE DISC OR TO THE COUNTER-DISC OF IMPELLERS FOR ROTARY MACHINES
JPS595898A (en) * 1982-07-02 1984-01-12 Hitachi Ltd Steel plate impeller for pump
JPS59211795A (en) * 1983-05-18 1984-11-30 Hitachi Ltd Impeller for centrifugal hydraulic machine
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SU1489951A1 (en) * 1987-10-20 1989-06-30 Тольяттинский политехнический институт Blank for making closed wheel of compressor by vacuum soldering
DE3939156C2 (en) * 1989-11-27 1994-01-27 Grundfos International A S Bje Compound impeller for a centrifugal pump
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103174669A (en) * 2011-12-21 2013-06-26 格兰富控股联合股份公司 Impeller

Also Published As

Publication number Publication date
ATE173062T1 (en) 1998-11-15
JPH09511557A (en) 1997-11-18
WO1995020724A1 (en) 1995-08-03
DE59504144D1 (en) 1998-12-10
EP0741840A1 (en) 1996-11-13
DK0741840T3 (en) 1999-07-19
DE4402493A1 (en) 1995-08-03

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