EP0464355A2 - Duplex centrifugal pump - Google Patents

Duplex centrifugal pump Download PDF

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Publication number
EP0464355A2
EP0464355A2 EP91108395A EP91108395A EP0464355A2 EP 0464355 A2 EP0464355 A2 EP 0464355A2 EP 91108395 A EP91108395 A EP 91108395A EP 91108395 A EP91108395 A EP 91108395A EP 0464355 A2 EP0464355 A2 EP 0464355A2
Authority
EP
European Patent Office
Prior art keywords
insert
side wall
centrifugal pump
flat side
outlet
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
EP91108395A
Other languages
German (de)
French (fr)
Other versions
EP0464355B1 (en
EP0464355A3 (en
Inventor
Günter Strelow
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.)
Wilo GmbH
Original Assignee
OPLAENDER WILO WERK GmbH
Wilo GmbH
Wilo Werk GmbH and Co
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 OPLAENDER WILO WERK GmbH, Wilo GmbH, Wilo Werk GmbH and Co filed Critical OPLAENDER WILO WERK GmbH
Priority to AT91108395T priority Critical patent/ATE98000T1/en
Publication of EP0464355A2 publication Critical patent/EP0464355A2/en
Publication of EP0464355A3 publication Critical patent/EP0464355A3/en
Application granted granted Critical
Publication of EP0464355B1 publication Critical patent/EP0464355B1/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
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0072—Installation or systems with two or more pumps, wherein the flow path through the stages can be changed, e.g. series-parallel
    • 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
    • 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
    • Y10S415/912—Interchangeable parts to vary pumping capacity or size of pump

Definitions

  • the invention relates to a double centrifugal pump with two pump impellers mounted in a housing and two parallel electric motors arranged side by side.
  • Double pumps are known which are used for parallel operation, series operation, separate operation, with the possibility of the rotation of the conveying direction and also with a switchover function. For each of these applications, it is necessary to provide an independent construction.
  • German Offenlegungsschrift 3624917 to insert an insert in a centrifugal pump into the pump housing, which forms the inlet and outlet, as well as the spirally widening outlet channel.
  • the object of the invention is to provide a double centrifugal pump create that can be used for the various applications with simple construction and small construction by small changes, while maintaining the pump housing.
  • the insert forms a spirally widening outlet channel for each impeller.
  • the use should also be at least one Form part of the flat side wall. It is particularly advantageous that the insert forms the connection surfaces for the inlet and outlet.
  • the insert is particularly inexpensive to manufacture if it is made of plastic. It is of the greatest advantage if the opening in the flat side wall is circular for use and merges into a cylindrical interior of the pump housing.
  • the double pump has two canned pumps and can be used as a hot water pump, especially in heating systems.
  • the pump 1 has a pump housing 2, in particular made of plastic or metal, in which two impellers are arranged axially parallel and in which a tubular inlet is formed axially. Around each of the impellers there is a spiral-shaped outlet channel.
  • the housing 2 is in the form of a circular disk, the height H of the cylindrical outer wall being substantially less than the diameter D of the circular flat, flat pump side wall. 6.
  • the openings 4, 7 and 8 are located in the plane of the side wall 6.
  • two canned electric motors 9 are attached coaxially to the impellers.
  • the pump housing 2 has an inner insert 3, which closely surrounds the impellers and forms the spirally widening outlet channels around the impellers, and an outer housing 11 surrounding the insert 3, which is fastened to the electric motors 9 and carries seals 13, which in the Level of the side wall 6 lie.
  • the insert 3 thus forms, together with the edge of the housing, the flat interface to the consumption or connection devices. It is particularly advantageous that the opening 5 in the flat side wall 6 for the insert 3 is circular and merges into a cylindrical interior 2a of the pump housing.
  • the outer housing 11 which acts as a pressure vessel, forms flanges 12 parallel to the side wall 6, which have bores 14 in order to be able to accommodate screws. With these screws, not shown, the outer housing 11 and thus the entire pump can be attached to consumption devices. Impellers 3 and inserts 3 of different powers and designs can be inserted into this outer housing 11.
  • the impellers be replaced by differently shaped impellers, but also the spiral channels surrounding the impellers and the inlet can be adapted to the respective impellers and the desired power as well as to the respective speed range be.
  • the inlet and outlet openings 4, 7, 8 located in the insert 3 can be adapted to the conditions of the consumption or connection devices in terms of their spacing from one another and also in their arrangement in the flat side wall 6. It is sufficient to change insert 3. to meet the requirements.
  • the channels can be shaped differently in the insert 3, and can also be arranged. Envelope flaps or check valves must be attached (stored) that correspond to the respective application.
  • the inner insert 3 can be made smaller than shown in the figures. It may be sufficient if it only forms the inlet opening 7 and the diffuser for the impeller.
  • the insert 3 can also consist of several parts. It is particularly easy to manufacture if it is made of plastic. In particular, this makes it possible and economically justifiable to include differently shaped inserts in the pump, so that the user can change the pump function or performance before installation.

Abstract

The invention relates to a duplex centrifugal pump with two impellers supported in a housing and two electric motors arranged side by side in parallel, - the pump housing having a plane side wall containing the inlet and outlet, - the pump housing being fixed by this flat side wall to a second device, in particular a consuming device, - an insert being detachably enclosed in the pump housing which can be slid in through a large aperture in the flat side wall and forms the inlet and outlet as well as internal connecting ducts and - one or more shut-off elements, particularly reversing valves or non- return valves, being arranged in the insert. <IMAGE>

Description

Die Erfindung betrifft eine Doppel-Kreiselpumpe mit zwei in einem Gehäuse gelagerten Pumpenlaufrädern und zwei parallele nebeneinander angeordnete Elektromotoren.The invention relates to a double centrifugal pump with two pump impellers mounted in a housing and two parallel electric motors arranged side by side.

Es sind Doppelpumpen bekannt, die für Parallelbetrieb, Reihenbetrieb, getrennten Betrieb, mit der Möglichkeit, der Umdrehung der Förderrichtung, als auch mit Umschaltfunktion, eingesetzt werden. Für jeden dieser Anwendungsfälle ist es erforderlich, eine eigenständige Konstruktion vorzusehen.Double pumps are known which are used for parallel operation, series operation, separate operation, with the possibility of the rotation of the conveying direction and also with a switchover function. For each of these applications, it is necessary to provide an independent construction.

Darüber hinaus ist aus der deutschen Offenlegungsschrift 3624917 bekannt, bei einer Kreiselpumpe in das Pumpengehäuse einen Einsatz einzubringen, der Ein- und Auslaß, als auch den sich spiralförmig erweiternden Auslaßkanal bildet.In addition, it is known from German Offenlegungsschrift 3624917 to insert an insert in a centrifugal pump into the pump housing, which forms the inlet and outlet, as well as the spirally widening outlet channel.

Aufgabe der Erfindung ist es, eine Doppel-Kreiselpumpe zu schaffen, die bei einfacher Konstruktion und kleiner Bauweise durch geringe Veränderungen, unter Beibehaltung des Pumpengehäuses, für die verschiedenen Anwendungsfälle einsetzbar ist.The object of the invention is to provide a double centrifugal pump create that can be used for the various applications with simple construction and small construction by small changes, while maintaining the pump housing.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst,

  • daß das Pumpengehäuse eine ebene Seitenwand aufweist, in der Ein- und Auslaß liegen,
  • daß das Pumpengehäuse mit dieser flachen Seitenwand an einer zweiten Vorrichtung insbesondere einer Verbrauchsvorrichtung befestigt ist,
  • daß im Pumpengehäuse ein Einsatz lösbar einliegt, der durch eine große Öffnung der flachen Seitenwand einschiebbar ist und Ein- und Auslaß als auch innere Verbindungskanäle bildet, und
  • daß im Einsatz ein Absperrorgan insbesondere eine Umschlagklappe oder ein Rückschlagventil angeordnet ist.
According to the invention, this object is achieved by
  • that the pump housing has a flat side wall in which the inlet and outlet lie,
  • that the pump housing is fastened with this flat side wall to a second device, in particular a consumption device,
  • that an insert releasably lies in the pump housing, which can be inserted through a large opening in the flat side wall and forms inlet and outlet as well as inner connecting channels, and
  • that in use a shut-off device, in particular an envelope flap or a check valve, is arranged.

Bei einer solchen Pumpe braucht nur der Einsatz an die verschiedenen Anwendungsfälle angepaßt zu sein, da der Einsatz sowohl die Verbindungswege, als auch das jeweilige Absperrorgan, d.h. z.B. die jeweilige erforderliche Umschlagklappe oder das Rückschlagventil, in der erforderlichen Bau- und Anschlußweise enthält. Der Einsatz ist über die Öffnung in der flachen Seitenwand leicht erreichbar und auswechselbar und die Abmessungen des Anschlußflansches des Pumpengehäuses bleiben gleich.With such a pump, only the use needs to be adapted to the various applications, since the use of both the connecting paths and the respective shut-off device, i.e. e.g. contains the respective required flap or check valve in the required construction and connection method. The insert is easily accessible and replaceable through the opening in the flat side wall and the dimensions of the connecting flange of the pump housing remain the same.

Besonders vorteilhaft ist es, wenn der Einsatz für jedes Laufrad jeweils einen sich spiralförmig erweiternden Auslaßkanal bildet. Auch sollte der Einsatz zumindest einen Teil der flachen Seitenwand bilden. Besonders vorteilhaft ist es, daß der Einsatz die Anschlußflächen für den Ein- und Auslaß bildet.It is particularly advantageous if the insert forms a spirally widening outlet channel for each impeller. The use should also be at least one Form part of the flat side wall. It is particularly advantageous that the insert forms the connection surfaces for the inlet and outlet.

Besonders preiswert ist der Einsatz herstellbar, wenn er aus Kunststoff besteht. Von größtem Vorteil ist es, wenn die Öffnung in der flachen Seitenwand für den Einsatz kreisförmig ist und in einen zylindrischen Innenraum des Pumpengehäuses übergeht.The insert is particularly inexpensive to manufacture if it is made of plastic. It is of the greatest advantage if the opening in the flat side wall is circular for use and merges into a cylindrical interior of the pump housing.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Fig. 1
eine Seitenansicht der Pumpe auf die flache Seitenwand und
Fig. 2
einen axialen Schnitt durch die Pumpe bei nicht geschnittenem Motor,
Fig. 3
verschieden Anwendungsfälle der erfindungsgemäßen Pumpe.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
Fig. 1
a side view of the pump on the flat side wall and
Fig. 2
an axial section through the pump with the motor not cut,
Fig. 3
different applications of the pump according to the invention.

Die Doppelpumpe weist zwei Spaltrohrpumpen auf und kann als Warmwasserpumpe, insbesondere in Heizungsanlagen eingesetzt werden. Die Pumpe 1 besitzt ein Pumpengehäuse 2, insbesondere aus Kunststoff oder Metall, in dem zwei Laufräder achsparallel angeordnet sind und in dem ein rohrförmiger Einlaß achsial eingeformt ist. Um die Laufräder herum befindet sich jeweils ein sich spiralfärmig erweiternder Auslaßkanal. Das Gehäuse 2 ist kreisscheibenförmig, wobei die Höhe H der zylindrischen Außenwand wesentlich geringer ist als der Durchmesser D der kreisförmigen ebenen, flachen Pumpenseitenwand. 6.The double pump has two canned pumps and can be used as a hot water pump, especially in heating systems. The pump 1 has a pump housing 2, in particular made of plastic or metal, in which two impellers are arranged axially parallel and in which a tubular inlet is formed axially. Around each of the impellers there is a spiral-shaped outlet channel. The housing 2 is in the form of a circular disk, the height H of the cylindrical outer wall being substantially less than the diameter D of the circular flat, flat pump side wall. 6.

In der Seitenwand 6 münden die Einlässe 7 und 8 mit den Einlaßöffnungen 7, 8 und der Auslaßkanal mit einer Auslaßöffnung 4. Die Öffnungen 4, 7 und 8 befinden sich in der Ebene der Seitenwand 6. Auf der der Seitenwand 6 gegenüberliegenden Seite des Pumpengehäuses 2 sind zwei Spaltrohr-Elektromotoren 9 koaxial zu den Laufrädern befestigt.The inlets 7 and 8 with the inlet openings 7, 8 and the outlet channel with an outlet opening 4 open into the side wall 6. The openings 4, 7 and 8 are located in the plane of the side wall 6. On the side of the pump housing 2 opposite the side wall 6 two canned electric motors 9 are attached coaxially to the impellers.

Das Pumpengehäuse 2 besitzt einen inneren Einsatz 3, der die Laufräder eng umgibt und die spiralförmig erweiternde Auslaßkanäle um die Laufräder herum bildet, und einen den Einsatz 3 umgebendes Außengehäuse 11, das an den Elektromotoren 9 befestigt ist und das Dichtungen 13 trägt, die in der Ebene der Seitenwand 6 liegen. Der Einsatz 3 bildet somit zusammen mit dem Gehäuserand die ebene Schnittstelle zu den Verbrauchs- oder Anschlußvorrichtungen. Besonders vorteilhaft ist es, daß die Öffnung 5 in der flachen Seitenwand 6 für den Einsatz 3 kreisförmig ist und in einen zylindrischen Innenraum 2a des Pumpengehäuses übergeht.The pump housing 2 has an inner insert 3, which closely surrounds the impellers and forms the spirally widening outlet channels around the impellers, and an outer housing 11 surrounding the insert 3, which is fastened to the electric motors 9 and carries seals 13, which in the Level of the side wall 6 lie. The insert 3 thus forms, together with the edge of the housing, the flat interface to the consumption or connection devices. It is particularly advantageous that the opening 5 in the flat side wall 6 for the insert 3 is circular and merges into a cylindrical interior 2a of the pump housing.

Das als Druckbehälter wirkende Außengehäuse 11 bildet parallel zur Seitenwand 6 Flansche 12 aus, die Bohrungen 14 besitzen, um Schrauben aufnehmen zu können. Mit diesen nicht dargestellten Schrauben ist das Außengehäuse 11 und damit die gesamte Pumpe an Verbrauchsvorrichtungen befestigbar. In dieses Außengehäuse 11 können Laufräder 3 und Einsätze 3 unterschiedlicher Leistungen und Bauweisen eingeschoben werden.The outer housing 11, which acts as a pressure vessel, forms flanges 12 parallel to the side wall 6, which have bores 14 in order to be able to accommodate screws. With these screws, not shown, the outer housing 11 and thus the entire pump can be attached to consumption devices. Impellers 3 and inserts 3 of different powers and designs can be inserted into this outer housing 11.

Hierzu können nicht nur die Laufräder durch unterschiedlich geformte Laufräder ersetzt werden, sondern es können auch die Laufräder umgebenden spiralförmigen Kanäle als auch der Einlaß an die jeweiligen Laufräder und die gewünschte Leistung als auch an den jeweiligen Drehzahlbereich angepaßt sein. Ferner können die im Einsatz 3 befindlichen Einlaß- und Auslaßöffnungen 4, 7, 8 in ihrem Abstand zueinander, als auch in ihrer Anordnung in der ebenen Seitenwand 6, an die Gegebenheiten der Verbrauchs- oder Anschlußvorrichtungen angepaßt sein. Es genügt, den Einsatz 3 zu wechseln. um den gestellten Anforderungen gerecht zu werden.For this purpose, not only can the impellers be replaced by differently shaped impellers, but also the spiral channels surrounding the impellers and the inlet can be adapted to the respective impellers and the desired power as well as to the respective speed range be. Furthermore, the inlet and outlet openings 4, 7, 8 located in the insert 3 can be adapted to the conditions of the consumption or connection devices in terms of their spacing from one another and also in their arrangement in the flat side wall 6. It is sufficient to change insert 3. to meet the requirements.

Die Kanäle können im Einsatz 3 unterschiedlich geformt, als auch angeordnet sein Asperrorgane 4 z.b. Umschlagklappen oder Rückschlagventile befestigt (gelagert) sein, die dem jeweiligen Einsatzzweck entsprechen.The channels can be shaped differently in the insert 3, and can also be arranged. Envelope flaps or check valves must be attached (stored) that correspond to the respective application.

Der innere Einsatz 3 kann kleiner als in den Figuren dargestellt ausgeführt sein. Es kann ausreichen, wenn er nur die Einlaßöffnung 7 und den Leitapparat für das Laufrad bildet. Der Einsatz 3 kann auch aus mehreren Teilen bestehen. Besonders einfach in der Herstellung ist er dann, wenn er aus Kunststoff besteht. Insbesondere hierdurch wird es möglich und wirtschaftlich vertretbar, der Pumpe verschieden geformte Einsätze beizulegen, so daß der Anwender vor dem Einbau die Pumpenfunktion oder -leistung ändern kann.The inner insert 3 can be made smaller than shown in the figures. It may be sufficient if it only forms the inlet opening 7 and the diffuser for the impeller. The insert 3 can also consist of several parts. It is particularly easy to manufacture if it is made of plastic. In particular, this makes it possible and economically justifiable to include differently shaped inserts in the pump, so that the user can change the pump function or performance before installation.

Claims (6)

Doppel-Kreiselpumpe mit zwei in einem Gehäuse (2) gelagerten Pumpenlaufrädern und zwei parallele nebeneinander angeordnete Elektromotoren dadurch gekennzeichnet, - daß das Pumpengehäuse (2,11) eine ebene Seitenwand (6) aufweist, in der Ein- und Auslaß (4,7,8) liegen, - daß das Pumpengehäuse (2,11) mit dieser flachen Seitenwand (6) an einer zweiten Vorrichtung insbesondere einer Verbrauchsvorrichtung befestigt ist, - daß im Pumpengehäuse (2,11) ein Einsatz (3) lösbar einliegt, der durch eine große Öffnung (5) der flachen Seitenwand (6) einschiebbar ist und Ein- und Auslaß (4,7,8) als auch innere Verbindungskanäle bildet, und - daß im Einsatz (3) ein, oder mehrere Absperrorgane (4) insbesondere Umschlagklappen oder Rückschlagventile angeordnet sind. Double centrifugal pump with two pump impellers mounted in a housing (2) and two parallel electric motors arranged next to one another, characterized in that - That the pump housing (2,11) has a flat side wall (6) in the inlet and outlet (4,7,8), - That the pump housing (2, 11) with this flat side wall (6) is attached to a second device, in particular a consumption device, - That in the pump housing (2,11) an insert (3) releasably lies, which can be inserted through a large opening (5) of the flat side wall (6) and forms inlet and outlet (4,7,8) as well as inner connecting channels , and - That in use (3) one or more shut-off devices (4) in particular flaps or check valves are arranged. Doppel-Kreiselpumpe nach Anspruch 1, dadurch gekennzeichnet, daß der Einsatz (3) für jedes Laufrad jeweils einen sich spiralförmig erweiternden Auslaßkanal bildet.Double centrifugal pump according to claim 1, characterized in that the insert (3) for each Impeller each forms a spirally widening outlet channel. Doppel-Kreiselpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Einsatz (3) zumindest einen Teil der flachen Seitenwand (6) bildet.Double centrifugal pump according to claim 1 or 2, characterized in that the insert (3) forms at least part of the flat side wall (6). Doppel-Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Einsatz (3) die Anschlußflächen für den Ein- und Auslaß` (4,7,8) bildet.Double centrifugal pump according to one of the preceding claims, characterized in that the insert (3) forms the connection surfaces for the inlet and outlet` (4,7,8). Doppel-Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Einsatz (3) aus Kunststoff besteht.Double centrifugal pump according to one of the preceding claims, characterized in that the insert (3) consists of plastic. Doppel-Kreiselpumpe nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Öffnung (5) in der flachen Seitenwand (6) für den Einsatz (3) kreisförmig ist und in einen zylindrischen Innenraum (2a) des Pumpengehäuses übergeht.Double centrifugal pump according to one of the preceding claims, characterized in that the opening (5) in the flat side wall (6) for the insert (3) is circular and merges into a cylindrical interior (2a) of the pump housing.
EP91108395A 1990-07-06 1991-05-24 Duplex centrifugal pump Expired - Lifetime EP0464355B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT91108395T ATE98000T1 (en) 1990-07-06 1991-05-24 DOUBLE CENTRIFUGAL PUMP.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4021410 1990-07-06
DE4021410A DE4021410A1 (en) 1990-07-06 1990-07-06 DOUBLE CENTRIFUGAL PUMP

Publications (3)

Publication Number Publication Date
EP0464355A2 true EP0464355A2 (en) 1992-01-08
EP0464355A3 EP0464355A3 (en) 1992-02-26
EP0464355B1 EP0464355B1 (en) 1993-12-01

Family

ID=6409706

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91108395A Expired - Lifetime EP0464355B1 (en) 1990-07-06 1991-05-24 Duplex centrifugal pump

Country Status (6)

Country Link
US (1) US5178520A (en)
EP (1) EP0464355B1 (en)
KR (1) KR970007394B1 (en)
AT (1) ATE98000T1 (en)
DE (2) DE4021410A1 (en)
ES (1) ES2046823T3 (en)

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CN110177949A (en) 2017-01-27 2019-08-27 塞阿姆斯特朗有限公司 Binary variable duty ratio performance optimizes pump unit
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USD940205S1 (en) * 2019-11-06 2022-01-04 Leistritz Pumpen Gmbh Pump for liquids
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EP0735272A1 (en) * 1995-03-28 1996-10-02 WILO GmbH Centrifugal pump with venting
EP1079113A1 (en) * 1999-08-21 2001-02-28 Grundfos A/S Centrifugal pump casing for a circulating pump for two fluid circuits
DE102018220150A1 (en) * 2018-11-23 2020-05-28 Mahle International Gmbh Pump module for coolant

Also Published As

Publication number Publication date
KR920002938A (en) 1992-02-28
ES2046823T3 (en) 1994-02-01
DE4021410A1 (en) 1992-01-16
US5178520A (en) 1993-01-12
KR970007394B1 (en) 1997-05-08
EP0464355B1 (en) 1993-12-01
ATE98000T1 (en) 1993-12-15
DE59100652D1 (en) 1994-01-13
EP0464355A3 (en) 1992-02-26

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