EP0646729A1 - Diffusor made of sheet metal - Google Patents

Diffusor made of sheet metal Download PDF

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Publication number
EP0646729A1
EP0646729A1 EP94113252A EP94113252A EP0646729A1 EP 0646729 A1 EP0646729 A1 EP 0646729A1 EP 94113252 A EP94113252 A EP 94113252A EP 94113252 A EP94113252 A EP 94113252A EP 0646729 A1 EP0646729 A1 EP 0646729A1
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EP
European Patent Office
Prior art keywords
blades
guide device
sheet metal
welding
blade
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
EP94113252A
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German (de)
French (fr)
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EP0646729B1 (en
Inventor
Oliver Schuster
Axel Kott
Kurt Seitz
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KSB AG
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KSB AG
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Publication date
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Publication of EP0646729A1 publication Critical patent/EP0646729A1/en
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Publication of EP0646729B1 publication Critical patent/EP0646729B1/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers

Definitions

  • the invention relates to a guide device for centrifugal pumps of a multi-stage design, the blades of the guide device being designed as sheet metal parts.
  • DE-PS 16 53 713 shows the structure of such a guide device using the example of a semi-axial pump stage design.
  • the stator and return vanes merge directly into one another and are designed as one-piece components that have to be fastened between an inner and outer casing.
  • This common design is also used in EP 0 257 358 B1, in which separate stator and return blades are used. These blades are also attached as individual elements between associated cover disks and connected to them, here in the form of a welded connection. Disadvantages in the manufacture of such guide devices are their filigree structure and the effort in terms of handling and guiding the individual blade elements.
  • the invention is therefore based on the problem of developing an easy-to-assemble design for the guide device of a multi-stage centrifugal pump made in sheet metal construction.
  • the solution to this problem provides that the blades of the guide device are part of a sheet metal part, at least two or more blades being bent out of a sheet metal part.
  • This can be a round blank from which the planar developments of the blades are cut out, such that the blades are still captively connected to the round blank.
  • the blades are bent out of the flat blank so that they run at an angle to the surface of the blank and form a blade channel between them.
  • the component thus formed which corresponds to a wall surface with blades attached thereon, is easy to handle.
  • the blades can be provided with molded welding bosses.
  • These welding bosses which are molded on when the blade development is cut out for the first time, offer the possibility of providing the component thus formed with a cover disk in the simplest manner, or of welding the blades directly onto a housing wall surface.
  • the main advantage of this solution is that the structure thus created is very easy to handle as a large unit and can be welded to another component in a single operation.
  • At least two blades are part of a sheet metal part. From a plate, on the edges of which the blade unions corresponding to their later mounting position are formed by two blades, a sheet metal part is created by bending up the edges, in which two blades form a blade channel between them. This results in shaped sheet metal parts, each with two molded blades, which make it possible to construct a guide device by using several of these shaped sheet metal parts. However, this variant is only suitable for guidance devices with an even number of blades. These sheet metal parts can then be attached to a plate, which can be used, for example, as a spatial separation between a guide device with a subsequent return section.
  • Such a device can also be manufactured in the simplest way. Cover disks can then be placed in the simplest manner on the integrally formed welding bosses of the blades are attached or the blades are welded to separating wall surfaces. It is also possible to connect the connecting surfaces located between the individual blades by spot welding to other parts of the guide device or pump housing.
  • the surfaces adjoining the blades are provided with cut-outs for contact surfaces and / or welding bosses molded onto the blades.
  • These welding humps are arranged to a certain extent on the underside of the blade or in the blade root zone. They are aligned with the welding bosses formed on the outer contour of the blade.
  • FIGS. 1 to 5 All representations of FIGS. 1 to 5 are shown using the example of a feedback device.
  • 1 shows a circular sheet-metal blank 1 on which a development of the blades 2 has already been cut out.
  • the blades 2 are each equipped with three welding bosses 3, which allow a connection to a wall surface or a cover plate to be attached to it after a later forming process.
  • the dash-dotted lines 4 form the bending line for the blades 2 to be bent later and the adjoining surfaces 5 correspond to the blade roots.
  • the surfaces forming the blade roots can be connected to the wall surfaces of a step housing or corresponding cover or cutting disks by a simple spot weld connection.
  • FIG. 2 shows the circular blank according to FIG. 1 after a shaping process.
  • the blades 2 are now at an angle to the plane of the drawing and have the three molded-on welding points 3 on their upper side.
  • the blade feet 5 have a width here, which enables problem-free spot welding with other surfaces.
  • FIG. 4 shows a plan view of the sheet metal parts of FIG. 3 with blades 2 bent upward. Between two blades 2 in each case a connecting surface 7 extends, which functionally can take over the function of a blade root.
  • the blades of a guide device thus created can be handled in a very convenient manner and connected to form a uniform, complete guide device. The tools required for this can also be designed very simply and inexpensively and their number can be minimized.
  • these bladed parts can easily be attached by means of the molded-on welding bosses. It is also easily possible to connect these bladed parts directly to a wall surface of a step housing.

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

Abstract

The invention relates to a diffusor produced in a sheet-metal type of construction and intended for multi-stage centrifugal pumps, a shaped sheet-metal part being provided with at least two or more integrally formed blades, it being possible to manipulate this shaped sheet-metal part in a simple manner and to connect it to other components of the diffusor. Welding projections already integrally formed on the blades serve to facilitate the connection to the other components. <IMAGE>

Description

Die Erfindung betrifft eine Leiteinrichtung für Kreiselpumpen mehrstufiger Bauart, wobei die Schaufeln der Leiteinrichtung als Blechformteile ausgebildet sind.The invention relates to a guide device for centrifugal pumps of a multi-stage design, the blades of the guide device being designed as sheet metal parts.

Durch die DE-PS 16 53 713 ist der Aufbau einer derartigen Leiteinrichtung am Beispiel einer halbaxialen Pumpenstufenbauart gezeigt. Die Leitrad- und Rückführschaufeln gehen hierbei direkt ineinander über und sind als einteilige Bauelemente ausgebildet, die zwischen einem Innen- und Außenmantel befestigt werden müssen. Diese übliche Bauart findet auch Verwendung in der EP 0 257 358 B1, bei der separate Leitrad- und Rückführschaufeln benutzt werden. Auch diese Schaufeln sind als einzelne Elemente zwischen zugehörigen Deckscheiben befestigt und mit diesen verbunden, hier in Form einer Schweißverbindung. Nachteilig bei der Herstellung derartiger Leiteinrichtungen ist deren filigraner Aufbau und der Aufwand hinsichtlich der Handhabung und Führung der einzelnen Schaufelelemente.DE-PS 16 53 713 shows the structure of such a guide device using the example of a semi-axial pump stage design. The stator and return vanes merge directly into one another and are designed as one-piece components that have to be fastened between an inner and outer casing. This common design is also used in EP 0 257 358 B1, in which separate stator and return blades are used. These blades are also attached as individual elements between associated cover disks and connected to them, here in the form of a welded connection. Disadvantages in the manufacture of such guide devices are their filigree structure and the effort in terms of handling and guiding the individual blade elements.

Der Erfindung liegt daher das Problem zugrunde, für die in Blechbauweise erstellte Leiteinrichtung einer mehrstufigen Kreiselpumpe eine einfach zu montierende Gestaltung zu entwickeln. Die Lösung dieses Problems sieht vor, daß die Schaufeln der Leiteinrichtung Bestandteil eines Blechformteiles sind, wobei mindestens zwei oder mehrere Schaufeln aus einem Blechformteil herausgebogen sind. Hierbei kann es sich um eine Ronde handeln, aus der die ebenen Abwicklungen der Schaufeln herausgeschnitten werden, derart, daS die Schaufeln immer noch unverlierbar mit der Ronde verbunden sind. In einem nachfolgenden Arbeitsgang werden dann die Schaufeln aus der ebenen Ronde herausgebogen, so daß sie im Winkel zur Rondenoberfläche verlaufen und zwischen sich einen Schaufelkanal ausbilden. Das so gebildete Bauteil, welches einer Wandfläche mit darauf befestigten Schaufeln entspricht, ist leicht zu handhaben.The invention is therefore based on the problem of developing an easy-to-assemble design for the guide device of a multi-stage centrifugal pump made in sheet metal construction. The solution to this problem provides that the blades of the guide device are part of a sheet metal part, at least two or more blades being bent out of a sheet metal part. This can be a round blank from which the planar developments of the blades are cut out, such that the blades are still captively connected to the round blank. Then in a subsequent operation the blades are bent out of the flat blank so that they run at an angle to the surface of the blank and form a blade channel between them. The component thus formed, which corresponds to a wall surface with blades attached thereon, is easy to handle.

Nach einer Ausgestaltung können die Schaufeln mit angeformten Schweißbuckeln versehen sein. Diese Schweißbuckel, die bereits beim ersten Ausschneiden der Schaufelabwicklung mit angeformt werden, bieten die Möglichkeit, das so gebildete Bauteil in einfachster Weise mit einer Deckscheibe zu versehen, bzw. die Schaufeln direkt an eine Gehäusewandfläche anzuschweißen. Der wesentliche Vorteil dieser Lösung besteht darin, daß das so geschaffene Gebilde als große Einheit sehr leicht zu handhaben ist und in einem einzigen Vorgang schweißtechnisch mit einem anderen Bauteil verbunden werden kann.According to one embodiment, the blades can be provided with molded welding bosses. These welding bosses, which are molded on when the blade development is cut out for the first time, offer the possibility of providing the component thus formed with a cover disk in the simplest manner, or of welding the blades directly onto a housing wall surface. The main advantage of this solution is that the structure thus created is very easy to handle as a large unit and can be welded to another component in a single operation.

Für diejenigen Anwendungsfälle, bei denen unter der Voraussetzung einer bequemen Handhabung eine Reduzierung des Materialaufwandes angestrebt wird, sind mindestens zwei Schaufeln Bestandteil von einem Blechformteil. Aus einer Platte, an deren Rändern die ihrer späteren Montageposition entsprechenden Schaufelabwicklungen von zwei Schaufeln angeformt sind, wird durch Hochbiegen der Ränder ein Blechformteil geschaffen, bei dem zwei Schaufeln zwischen sich einen Schaufelkanal ausbilden. Somit entstehen Blechformteile mit jeweils zwei angeformten Schaufeln, die es ermöglichen, durch Verwendung von mehreren dieser Blechformteile eine Leiteinrichtung aufzubauen. Diese Variante eignet sich jedoch nur für Leiteinrichtungen mit geraden Schaufelzahlen. Diese Blechformteile können dann auf eine Platte befestigt werden, die beispielsweise als räumliche Trennung zwischen einer Leiteinrichtung mit nachfolgender Rückführpartie Verwendung finden kann. Auch eine derartige Einrichtung läßt sich in einfachster Weise fertigen. Auf den angeformten Schweißbuckeln der Schaufeln können dann in einfachster Weise Deckscheiben angebracht werden bzw. die Schaufeln an trennende Wandflächen angeschweißt werden. Genauso ist es möglich, die zwischen den einzelnen Schaufeln befindlichen verbindenden Flächen durch Punktschweißen mit anderen Leiteinrichtungs- oder Pumpengehäuseteilen zu verbinden.For those applications in which a reduction in the cost of materials is sought, provided that handling is comfortable, at least two blades are part of a sheet metal part. From a plate, on the edges of which the blade unions corresponding to their later mounting position are formed by two blades, a sheet metal part is created by bending up the edges, in which two blades form a blade channel between them. This results in shaped sheet metal parts, each with two molded blades, which make it possible to construct a guide device by using several of these shaped sheet metal parts. However, this variant is only suitable for guidance devices with an even number of blades. These sheet metal parts can then be attached to a plate, which can be used, for example, as a spatial separation between a guide device with a subsequent return section. Such a device can also be manufactured in the simplest way. Cover disks can then be placed in the simplest manner on the integrally formed welding bosses of the blades are attached or the blades are welded to separating wall surfaces. It is also possible to connect the connecting surfaces located between the individual blades by spot welding to other parts of the guide device or pump housing.

Nach einer weiteren Ausgestaltung der Erfindung sind die an die Schaufeln angrenzenden Flächen mit Freischnitten für an die Schaufeln angeformte Anlageflächen und/oder Schweißbuckel versehen. Diese Schweißbuckel sind gewissermaßen an der Schaufelunterseite oder in der Schaufelfußzone angeordnet. Sie fluchten mit den an der Außenkontur der Schaufel angeformten Schweißbuckel. Somit ist der Vorteil gegeben, daß das die Schaufeln aufweisende Formteil sowie die damit verbundenen saug- und druckseitigen Deckscheiben in einem Arbeitsgang miteinander verschweißt werden können. Die im Bereich der Schweißbuckel befindlichen Anlageflächen dienen als Anschlag während des Schweißvorganges und sorgen für eine gleichmäßige Breite des Schaufelkanals.According to a further embodiment of the invention, the surfaces adjoining the blades are provided with cut-outs for contact surfaces and / or welding bosses molded onto the blades. These welding humps are arranged to a certain extent on the underside of the blade or in the blade root zone. They are aligned with the welding bosses formed on the outer contour of the blade. This has the advantage that the molded part having the blades and the associated suction and pressure-side cover disks can be welded to one another in one operation. The contact surfaces in the area of the welding boss serve as a stop during the welding process and ensure a uniform width of the blade channel.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Dabei zeigen die

Fig. 1
einen Blechzuschnitt in Form einer Ronde, die
Fig. 2
den gleichen Blechzuschnitt mit herausgebogenen Schaufeln, die
Fig. 3
zwei ebene Blechzuschnitte mit angeformten Schaufelabwicklungen, die
Fig. 4
die Blechzuschnitte der Fig. 3 mit herausgebogenen Schaufeln und die
Fig. 5
einen Schnitt gemäß Linie A-B von Fig. 4.
Embodiments of the invention are shown in the drawings and are described in more detail below. The show
Fig. 1
a sheet metal blank in the form of a round blank, the
Fig. 2
the same sheet metal blank with blades bent out
Fig. 3
two flat sheet metal blanks with molded blade developments, the
Fig. 4
3 with blades bent out and the
Fig. 5
4 shows a section along line AB of FIG. 4.

Alle Darstellungen der Fig. 1 bis 5 sind am Beispiel einer Rückführeinrichtung gezeigt. Die Fig. 1 zeigt einen rondenförmigen Blechzuschnitt 1, an dem eine Abwicklung der Schaufeln 2 bereits ausgeschnitten ist. Die Schaufeln 2 sind hier mit jeweils drei Schweißbuckeln 3 ausgestattet, welche nach einem späteren Umformvorgang eine Verbindung mit einer Wandfläche oder einer daran anzubringenden Deckplatte ermöglichen. Die strichpunktierten Linien 4 bilden die Biegelinie für die später umzubiegenden Schaufeln 2 und die daran angrenzenden Flächen 5 entsprechen den Schaufelfüßen. Die die Schaufelfüße ausbildenden Flächen können durch einfache Punktschweißverbindung mit Wandflächen eines Stufengehäuses oder entsprechenden Deck- oder Trennscheiben verbunden werden.All representations of FIGS. 1 to 5 are shown using the example of a feedback device. 1 shows a circular sheet-metal blank 1 on which a development of the blades 2 has already been cut out. The blades 2 are each equipped with three welding bosses 3, which allow a connection to a wall surface or a cover plate to be attached to it after a later forming process. The dash-dotted lines 4 form the bending line for the blades 2 to be bent later and the adjoining surfaces 5 correspond to the blade roots. The surfaces forming the blade roots can be connected to the wall surfaces of a step housing or corresponding cover or cutting disks by a simple spot weld connection.

In der Fig. 2 ist die Ronde gemäß Fig. 1 nach einem Umformvorgang gezeigt. Die Schaufeln 2 stehen jetzt im Winkel zur Zeichenebene und weisen auf ihrer Oberseite die drei angeformten Schweißpunkte 3 auf. Die Schaufelfüße 5 weisen hier eine Breite auf, welche eine problemlose Punktschweißung mit anderen Flächen ermöglicht.FIG. 2 shows the circular blank according to FIG. 1 after a shaping process. The blades 2 are now at an angle to the plane of the drawing and have the three molded-on welding points 3 on their upper side. The blade feet 5 have a width here, which enables problem-free spot welding with other surfaces.

Gemäß der Fig. 3 sind zwei bogenförmige Blechformteile 6 gezeigt, deren äußere Krümmungsradien mit angeformten Abwicklungen von zwei Schaufeln 2 ausgestattet sind. Auch hier sind bereits die Schweißbuckel 3 mit angeformt und das spätere Herausbiegen der Schaufeln erfolgt an den Biegelinien 4. Am Beispiel dieser Schaufeln ist eine weitere vorteilhafte Ausgestaltung gezeigt. Die Biegelinie 4 als eine Begrenzungslinie benutzend, sind in einer die Schaufeln 2 hier verbindenden Fläche 7 mehrere Freischnitte 8 ausgestanzt. Deren Anzahl entspricht der gewählten Anzahl der Schweißbuckel 3. Damit lassen sich im Bereich der sogenannten Schaufelfüße Anlageflächen 9 und Schweißbuckel 10 anformen. Die Schweißbuckel 10 liegen nach dem Biegen der Schaufeln 2 mit den Schweißbuckeln 3 in der gleichen Achsrichtung. Somit kann das die Schaufeln aufweisende Bauteil in einem Arbeitsgang mit den Deckscheiben verschweißt werden, wobei die Anschläge 9 eine gleichmäßige Höhe der Schaufelkanäle gewährleisten. Diese Art der Schweißbuckel-Ausbildung kann selbstverständlich auch bei der Ausbildung gemäß Fig. 1 und 2 Verwendung finden.3, two arcuate sheet metal parts 6 are shown, the outer radii of curvature of which are equipped with molded-on developments of two blades 2. Here, too, the welding bosses 3 are already formed and the later bending out of the blades takes place at the bending lines 4. A further advantageous embodiment is shown using the example of these blades. Using the bending line 4 as a boundary line, several free cuts 8 are punched out in a surface 7 connecting the blades 2 here. Their number corresponds to the selected number of welding bosses 3. This allows contact surfaces 9 and welding bosses 10 to be formed in the area of the so-called blade roots. The welding bosses 10 lie after the blades 2 have been bent the welding bosses 3 in the same axial direction. Thus, the component having the blades can be welded to the cover disks in one operation, the stops 9 ensuring a uniform height of the blade channels. This type of welding hump training can of course also be used in the training according to FIGS. 1 and 2.

Die Fig. 4 zeigt eine Draufsicht auf die Blechformteile der Fig. 3 mit hochgebogenen Schaufeln 2. Zwischen jeweils zwei Schaufeln 2 erstreckt sich eine verbindende Fläche 7, die von ihrer Funktion her die Aufgabe eines Schaufelfußes übernehmen kann. Ebenso wie die in den Fig. 1 und 2 gezeigten Ausgestaltungen lassen sich die so erstellten Schaufeln einer Leiteinrichtung in ganz bequemer Art und Weise handhaben und zu einer einheitlichen ganzen Leiteinrichtung verbinden. Die hierfür notwendigen Werkzeuge können ebenfalls sehr einfach und kostengünstig gestaltet und in ihrer Anzahl minimiert werden. Neben der bequemen Handhabung, beispielsweise als ein einziges beschaufeltes Teil gemäß den Fig. 1 und 2, und bei einer Anordnung an einer zwischen Leitrad und Rückführeinrichtung angeordneten Gehäusewandfläche, können diese beschaufelten Teile durch die angeformten Schweißbuckel einfach angebracht werden. Es ist auch ohne weiteres möglich, diese beschaufelten Teile direkt mit einer Wandfläche eines Stufengehäuses zu verbinden.FIG. 4 shows a plan view of the sheet metal parts of FIG. 3 with blades 2 bent upward. Between two blades 2 in each case a connecting surface 7 extends, which functionally can take over the function of a blade root. Like the embodiments shown in FIGS. 1 and 2, the blades of a guide device thus created can be handled in a very convenient manner and connected to form a uniform, complete guide device. The tools required for this can also be designed very simply and inexpensively and their number can be minimized. In addition to the convenient handling, for example as a single bladed part according to FIGS. 1 and 2, and in the case of an arrangement on a housing wall surface arranged between the stator and return device, these bladed parts can easily be attached by means of the molded-on welding bosses. It is also easily possible to connect these bladed parts directly to a wall surface of a step housing.

Dieses hier am Beispiel einer Rückführeinrichtung gezeigte Bauprinzip ist ohne weiteres auch für die Schaufeln eines sogenannten Leitrades verwendbar. Es würden sich dann lediglich die Durchmesserverhältnisse und gegebenenfalls der Schaufelverlauf anders darstellen. Zudem erlaubt diese Art der Herstellung eine größere Kombinationsvielfalt im Zusammenhang mit einer bestehenden Baureihe.This construction principle shown here using the example of a feedback device can also be used without further ado for the blades of a so-called stator. Then only the diameter ratios and possibly the blade shape would be represented differently. In addition, this type of production allows a greater variety of combinations in connection with an existing series.

Claims (4)

Leiteinrichtung für Kreiselpumpen mehrstufiger Bauart, wobei die Leiteinrichtung das aus einem Laufrad austretende Fördermedium energetisch beeinflußt und/oder einer weiteren Pumpenstufe zuleitet und die Schaufeln der Leiteinrichtung als Blechformteile ausgebildet sind, dadurch gekennzeichnet, daß die Schaufeln (2) der Leiteinrichtung Bestandteil eines Blechformteiles (1, 6) sind, wobei mindestens zwei oder mehrere Schaufeln (2) aus einem Blechformteil (1, 6) herausgebogen sind.Guide device for centrifugal pumps of multi-stage design, the guide device energetically influencing the delivery medium emerging from an impeller and / or supplying it to a further pump stage, and the blades of the guide device are formed as sheet metal parts, characterized in that the blades (2) of the guide device form part of a molded sheet metal part (1 , 6), at least two or more blades (2) being bent out of a sheet metal part (1, 6). Leiteinrichtung nach Anspruch 1, dadurch gekennzeichnet daß die Schaufeln (2) mit angeformten Schweißbuckeln (3) versehen sind.Guide device according to claim 1, characterized in that the blades (2) are provided with molded-on welding bosses (3). Leiteinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mindestens zwei Schaufeln (2) durch eine Fläche (5, 7) miteinander verbunden sind.Guide device according to claim 1 or 2, characterized in that at least two blades (2) are connected to one another by a surface (5, 7). Leiteinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß an die Schaufeln (2) angrenzende Flächen (5, 7) mit Freischnitten (8) für an den Schaufeln (2) angeformte Anlageflächen (9) und/oder Schweißbuckeln (10) versehen sind.Guide device according to one of claims 1 to 3, characterized in that surfaces (5, 7) adjoining the blades (2) with free cuts (8) for contact surfaces (9) and / or welding bosses (10) formed on the blades (2). are provided.
EP94113252A 1993-09-06 1994-08-25 Diffusor made of sheet metal Expired - Lifetime EP0646729B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4330098 1993-09-06
DE4330098A DE4330098A1 (en) 1993-09-06 1993-09-06 Guide device designed as a molded sheet metal part

Publications (2)

Publication Number Publication Date
EP0646729A1 true EP0646729A1 (en) 1995-04-05
EP0646729B1 EP0646729B1 (en) 1997-12-03

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EP1520992A2 (en) * 2003-10-04 2005-04-06 KSB Aktiengesellschaft Diffuser for a rotatory pump
WO2005103499A1 (en) * 2004-04-26 2005-11-03 Ebara Corporation Centrifugal pump and method of manufacturing the same
FR2879265A1 (en) * 2004-12-10 2006-06-16 Pompes Salmson Sa Diffuser for single-celled centrifugal pump of multi-stage pump, has helical blades with projections whose cooperation with notches in flange and/or envelope permits to maintain blades in position between inner flange and outer envelope
WO2007082417A1 (en) * 2006-01-21 2007-07-26 Yangjiang City Xinli Industry Co., Ltd Food centrifugal pump formed by pressing and welding
CN102852805A (en) * 2011-06-27 2013-01-02 王喜冬 Hard alloy amphibious mine vertical pump capable of being idled and connected in series
CN110319025A (en) * 2018-03-29 2019-10-11 王喜冬 Amphibious type idle running vertical pump for mine
CN110319023A (en) * 2018-03-29 2019-10-11 王喜冬 Amphibious type idle running vertical pump for mine
CN110319024A (en) * 2018-03-29 2019-10-11 王喜冬 Amphibious type idle running vertical pump for mine

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CN101737351A (en) * 2008-11-20 2010-06-16 上海连成（集团）有限公司 Novel double-suction pump with flow channel type guide blade

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EP1520992A2 (en) * 2003-10-04 2005-04-06 KSB Aktiengesellschaft Diffuser for a rotatory pump
EP1520992A3 (en) * 2003-10-04 2005-07-27 KSB Aktiengesellschaft Diffuser for a rotatory pump
WO2005103499A1 (en) * 2004-04-26 2005-11-03 Ebara Corporation Centrifugal pump and method of manufacturing the same
CN100432450C (en) * 2004-04-26 2008-11-12 株式会社荏原制作所 Centrifugal pump and method of manufacturing the same
US7632065B2 (en) 2004-04-26 2009-12-15 Ebara Corporation Centrifugal pump and method of manufacturing the same
FR2879265A1 (en) * 2004-12-10 2006-06-16 Pompes Salmson Sa Diffuser for single-celled centrifugal pump of multi-stage pump, has helical blades with projections whose cooperation with notches in flange and/or envelope permits to maintain blades in position between inner flange and outer envelope
WO2007082417A1 (en) * 2006-01-21 2007-07-26 Yangjiang City Xinli Industry Co., Ltd Food centrifugal pump formed by pressing and welding
US8113802B2 (en) 2006-01-21 2012-02-14 Guangdong Winning Pumps Industrial Co., Ltd. Food centrifugal pump formed by stamping and welding having a seal arrangement between the impeller and casing
CN102852805A (en) * 2011-06-27 2013-01-02 王喜冬 Hard alloy amphibious mine vertical pump capable of being idled and connected in series
CN102852805B (en) * 2011-06-27 2015-09-02 王喜冬 Cemented carbide idle running can be connected amphibious vertical pump for mine
CN110319025A (en) * 2018-03-29 2019-10-11 王喜冬 Amphibious type idle running vertical pump for mine
CN110319023A (en) * 2018-03-29 2019-10-11 王喜冬 Amphibious type idle running vertical pump for mine
CN110319024A (en) * 2018-03-29 2019-10-11 王喜冬 Amphibious type idle running vertical pump for mine
CN110319023B (en) * 2018-03-29 2024-04-09 王喜冬 Amphibious type idling mining vertical pump
CN110319024B (en) * 2018-03-29 2024-04-09 王喜冬 Amphibious type idling mining vertical pump
CN110319025B (en) * 2018-03-29 2024-04-09 王喜冬 Amphibious type idling mining vertical pump

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EP0646729B1 (en) 1997-12-03
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DE59404713D1 (en) 1998-01-15

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