EP0667455A1 - Double pump - Google Patents

Double pump Download PDF

Info

Publication number
EP0667455A1
EP0667455A1 EP95101520A EP95101520A EP0667455A1 EP 0667455 A1 EP0667455 A1 EP 0667455A1 EP 95101520 A EP95101520 A EP 95101520A EP 95101520 A EP95101520 A EP 95101520A EP 0667455 A1 EP0667455 A1 EP 0667455A1
Authority
EP
European Patent Office
Prior art keywords
channel
inlet
double pump
chamber
pump according
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
EP95101520A
Other languages
German (de)
French (fr)
Other versions
EP0667455B1 (en
Inventor
Thomas Materne
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 SE
Original Assignee
Wilo GmbH
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 Wilo GmbH filed Critical Wilo GmbH
Publication of EP0667455A1 publication Critical patent/EP0667455A1/en
Application granted granted Critical
Publication of EP0667455B1 publication Critical patent/EP0667455B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/04—Priming; Preventing vapour lock using priming pumps; using booster pumps to prevent vapour-lock
    • 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

Definitions

  • the invention relates to a double pump with an inlet A for both pumps, from which an inlet duct branches to both outlet openings of the two pumps.
  • a double pump is usually arranged in the system in such a way that the upper pump cannot be properly filled with the medium without a separate vent. The pump cannot pump the medium if it is not self-priming.
  • the object of the invention is to improve a double pump, in particular with non-self-priming pumps, so that the pump that is not running is reliably vented by the running pump.
  • the inlet channel in front of and / or behind the branching has at least one opening leading to a chamber or to a side channel through which a vacuum can be generated in the chamber or in the side channel, the interior of the non-running pump is connected to the chamber / side channel so that air can be drawn in from the non-running pump.
  • the invention now creates the possibility of completely filling or venting both containers or rooms and the pump described above, without a separate venting facility having to be attached to it, and thus ensuring that the stationary pump starts up.
  • the double pump is of simple construction and assembly and has small external dimensions.
  • Advantageous embodiments of the invention are listed in the subclaims.
  • the double pump has a first lower pump 13 and a second upper, not self-priming pump 14, the impeller axes of which are parallel to one another and which are each driven by electric motors. They are preferably centrifugal pumps with a canned motor.
  • the pump housings of both pumps are connected to one another and thus form a common housing 16, which forms a projecting housing part 17 on the side facing away from the motors, which encloses two chambers 6, 7 and a transverse channel 3, 4.
  • This side wall forms a flat connecting surface 15 with which the double pump can be connected to a flat side wall of a consumer.
  • the consumer side wall has two inlet openings and one outlet opening, which are aligned with the pressure outlets 11, 12 of the double pump and the central inlet A or the transverse channel 3, 4.
  • the outlets 11, 12 of the pump are also at the level of the connection surface 15 and penetrate the chamber 6 or 7.
  • the central inlet or inlet A is located centrally in the connection surface 15 and thus centrally in the inlet channel 3, 4, which branches into two sub-channels 3, 4, which are each arranged radially.
  • the upper inlet duct 3 ends at the suction opening E or the suction nozzle of the upper, second pump 14, and the lower inlet duct 2 ends at the suction opening D or the suction nozzle of the first lower pump 13. This flows through the central inlet or Inlet A medium drawn into two streams via channels 2,3 to the first and second pumps when both pumps are running at the same time.
  • the diametrical transverse channel 2, 3 is separated from the side chambers 6, 7 by two parallel side walls 17, 18.
  • side openings 4,5,8,9 are side openings 4,5,8,9 in the side walls 17,18, which connect the channels 2,3 with the chambers 6,7.
  • the upper channel 3 can be separated from the lower channel 2 by a partition wall 1, the channel parts 2, 3 being of the same size and the partition wall 1 dividing the medium entering into two streams.
  • the quantity of medium requested through the suction opening D of the lower pump is greater than the proportion provided directly through channel 2. This creates a vacuum in the lower area of the room. This causes medium to be sucked out of the part-segment-shaped chambers 6 and 7 through the side openings 8 and 9 at the end of the channel 2.
  • the circulation which is brought about causes the air collected in the chambers 6 and 7 to be carried through the openings of the channel 2. Furthermore, the Air collected in the upper engine through the intake opening (intake port) E into the chambers to be vented and is largely discharged.
  • the profiles or the rib-shaped guide elements 10 accelerate the air separation. On the one hand, they convert the air that has accumulated over a large area into small air bubbles and increase the circulation of the medium brought about in subsegments 6 and 7 by means of a nozzle effect.
  • the upper pump is therefore free of air and starts up at any time without any problems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

A double pump has a single inlet (A) for both pumps from which an inlet channel branches to both pump outlet openings. The inlet channel (2,3) has at least one opening (4,5,8,9) before and/or after the branch, leading to a chamber (6,7) or to side channel, and via which a vacuum is produced in the chamber or side channel. The internal of the non-running pump is connected to the chamber or side channel, so that air can be suctioned from the non-running pump. The internal portion of the pump is connected to the chamber or side channel via its suction opening (E) and at least one side opening (4,5).

Description

Die Erfindung betrifft eine Doppelpumpe mit einem Einlaß A für beide Pumpen, von dem ein Einlaßkanal zu beiden Ausgangsöffnungen der zwei Pumpen verzweigt.The invention relates to a double pump with an inlet A for both pumps, from which an inlet duct branches to both outlet openings of the two pumps.

In hydraulischen Systemen kommt es häufig vor, daß Behälter mit dem Medium zu befüllen sind, deren Zu- und Abläufe sich nicht an der obersten Stelle des Behälters befinden. Diese Räume können nicht vollständig befüllt werden, es verbleibt Restluft im Behälter. Um Störungen zu vermeiden, müssen an den höchsten Stellen Entlüftungsmöglichkeiten angebracht werden. Da die Gefahr besteht, daß während des Betriebes weitere Luft in diese Räume transportiert wird, muß diese Luft von Zeit zu Zeit abgeführt werden. Da solche Räume bzw. Behälter gehäuft in hydraulischen Systemen auftreten können, bedeutet dies einen erhöhten Aufwand bei der Wartung, um Störungen zu vermeiden bzw. auszuschließen.In hydraulic systems it often happens that containers are to be filled with the medium, the inflows and outflows of which are not at the top of the container. These rooms cannot be filled completely, residual air remains in the container. To avoid malfunctions, ventilation options must be installed at the highest points. Since there is a risk that more air will be transported into these rooms during operation, this air must be removed from time to time. Since such rooms or containers can occur frequently in hydraulic systems, this means an increased outlay on maintenance in order to avoid or rule out malfunctions.

Ein besonderes Problem ist dies bei einer Doppelpumpe. Eine Doppelpumpe ist meist so im System angeordnet, daß die obere Pumpe ohne eine separate Entlüftung nicht ordnungsgemäß mit dem Medium befüllt werden kann. Die Pumpe kann, wenn sie nicht selbstansaugend ist, das Medium nicht fördern.This is a particular problem with a double pump. A double pump is usually arranged in the system in such a way that the upper pump cannot be properly filled with the medium without a separate vent. The pump cannot pump the medium if it is not self-priming.

Aufgabe der Erfindung ist es, eine Doppelpumpe insbesondere mit nicht selbst ansaugenden Pumpen so zu verbessern, daß die jeweils nicht laufende Pumpe durch die laufende Pumpe sicher entlüftet wird.The object of the invention is to improve a double pump, in particular with non-self-priming pumps, so that the pump that is not running is reliably vented by the running pump.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Einlaßkanal vor und/oder hinter der Verzweigung seitlich mindestens eine zu einer Kammer oder zu einem Seitenkanal führende Öffnung aufweist, durch die in der Kammer bzw. in dem Seitenkanal ein Unterdruck erzeugbar ist, wobei das Innere der nicht laufenden Pumpe mit der Kammer/dem Seitenkanal verbunden ist, so daß Luft aus der nicht laufenden Pumpe ansaugbar ist.This object is achieved in that the inlet channel in front of and / or behind the branching has at least one opening leading to a chamber or to a side channel through which a vacuum can be generated in the chamber or in the side channel, the interior of the non-running pump is connected to the chamber / side channel so that air can be drawn in from the non-running pump.

Die Erfindung schafft nunmehr die Möglichkeit, sowohl Behälter bzw. Räume als auch die oben beschriebene Pumpe, ohne daß eine separate Entlüftungsmöglichkeit an diesem angebracht werden muß, vollständig mit dem Medium zu befüllen bzw. zu entlüften und damit ein Anlaufen der stillstehenden Pumpe zu gewährleisten.The invention now creates the possibility of completely filling or venting both containers or rooms and the pump described above, without a separate venting facility having to be attached to it, and thus ensuring that the stationary pump starts up.

Hierbei ist die Doppelpumpe von einfacher Konstruktion und Montage und weist kleine Außenabmessungen auf. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen aufgeführt.The double pump is of simple construction and assembly and has small external dimensions. Advantageous embodiments of the invention are listed in the subclaims.

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

  • Fig. 1: Eine perspektivische Außenansicht der Doppelpumpe,
  • Fig. 2: eine Seitenansicht der Doppelpumpe ohne Leitelemente in den Kammern und
  • Fig. 3: eine Seitenansicht der Doppelpumpe mit Leitelementen in den Kammern.
An embodiment of the invention is shown in the drawings and will be described in more detail below. Show it:
  • 1: an external perspective view of the double pump,
  • Fig. 2: a side view of the double pump without guide elements in the chambers and
  • Fig. 3: a side view of the double pump with guide elements in the chambers.

Die Doppelpumpe weist eine erste untere Pumpe 13 und eine zweite obere, nicht selbst ansaugende Pumpe 14 auf, deren Laufradachsen zueinander parallel sind und die jeweils durch Elektromotoren angetrieben werden. Vorzugsweise sind es Kreiselpumpen mit Spaltrohrmotor.The double pump has a first lower pump 13 and a second upper, not self-priming pump 14, the impeller axes of which are parallel to one another and which are each driven by electric motors. They are preferably centrifugal pumps with a canned motor.

Die Pumengehäuse beider Pumpen sind miteinander verbunden und bilden damit ein gemeinsames Gehäuse 16, das auf der den Motoren abgewandten Seite ein vorspringendes Gehäuseteil 17 bildet, das zwei Kammern 6,7 und einen Querkanal 3,4 umschließt. Die zwei Kammern 6,7 und der zwischen ihnen liegende, sie trennende diametrale Einlaßkanal 2,3 bilden zusammen eine hohle Kreisscheibe, deren Achse parallel zu den Achsen der Laufräder ist und deren den Pumpen abgewandte Seitenwand offen ist. Diese Seitenwand bildet eine flache Anschlußfläche 15, mit der die Doppelpumpe an eine flache Seitenwand eines Verbrauchers anschließbar ist. Hierbei weist die Verbraucherseitenwand zwei Einlaßöffnungen und eine Auslaßöffnung auf, die mit den Druckauslässen 11,12 der Doppelpumpe und dem zentralen Einlaß A bzw. dem Querkanal 3,4 fluchten. Hierbei liegen die Auslässe 11,12 der Pumpe auch in Höhe der Anschlußfläche 15 und durchdringen die Kammer 6 bzw. 7.The pump housings of both pumps are connected to one another and thus form a common housing 16, which forms a projecting housing part 17 on the side facing away from the motors, which encloses two chambers 6, 7 and a transverse channel 3, 4. The two chambers 6, 7 and the diametrical inlet duct 2, 3 between them, separating them, together form a hollow circular disc, the axis of which is parallel to the axes of the impellers and whose side wall facing away from the pumps is open. This side wall forms a flat connecting surface 15 with which the double pump can be connected to a flat side wall of a consumer. Here, the consumer side wall has two inlet openings and one outlet opening, which are aligned with the pressure outlets 11, 12 of the double pump and the central inlet A or the transverse channel 3, 4. The outlets 11, 12 of the pump are also at the level of the connection surface 15 and penetrate the chamber 6 or 7.

Der zentrale Einlaß bzw. Zulauf A liegt mittig in der Anschlußfläche 15 und damit mittig im Einlaßkanal 3,4, der in zwei Teilkanäle 3,4 verzweigt, die jeweils radial angeordnet sind. Der obere Einlaßkanal 3 endet an der Ansaugöffnung E bzw. dem Saugstutzen der oberen, zweiten Pumpe 14, und der untere Einlaßkanal 2 endet an der Ansaugöffnung D bzw. an dem Saugstutzen der ersten unteren Pumpe 13. Damit fließt das durch den zentralen Zulauf bzw. Einlaß A angesaugte Medium in zwei Ströme geteilt über die Kanäle 2,3 zur ersten und zweiten Pumpe, wenn beide Pumpen gleichzeitig laufen.The central inlet or inlet A is located centrally in the connection surface 15 and thus centrally in the inlet channel 3, 4, which branches into two sub-channels 3, 4, which are each arranged radially. The upper inlet duct 3 ends at the suction opening E or the suction nozzle of the upper, second pump 14, and the lower inlet duct 2 ends at the suction opening D or the suction nozzle of the first lower pump 13. This flows through the central inlet or Inlet A medium drawn into two streams via channels 2,3 to the first and second pumps when both pumps are running at the same time.

Der diametrale Querkanal 2,3 ist durch zwei zueinander parallele Seitenwände 17,18 von den seitlichen Kammern 6,7 getrennt. Am oberen und unteren Ende jeweils im Bereich der Ansaugöffnungen E,D befinden sich in den Seitenwänden 17,18 Seitenöffnungen 4,5,8,9, die die Kanäle 2,3 mit den Kammern 6,7 verbinden. Diese verhältnismäßig kleinen Öffnungen, insbesondere in Schlitzform, lassen ein Durchströmen der Kammer 6,7 von den oberen Seitenöffnungen 4,5 zu den unteren Seitenöffnungen oder in umgekehrter Strömungsrichtung zu, je nach dem, welche der beiden Pumpen stillsteht. Hierdurch saugt die jeweils laufende Pumpe Luft aus der nicht laufenden Pumpen heraus.The diametrical transverse channel 2, 3 is separated from the side chambers 6, 7 by two parallel side walls 17, 18. At the upper and lower ends in the area of the suction openings E, D there are side openings 4,5,8,9 in the side walls 17,18, which connect the channels 2,3 with the chambers 6,7. These relatively small openings, in particular in the form of a slot, allow the chamber 6, 7 to flow through from the upper side openings 4.5 to the lower side openings or in the reverse flow direction, depending on which of the two pumps is stopped. As a result, the pump that is running in each case sucks air out of the pumps that are not running.

In Höhe des zentralen Einlasses A kann der obere Kanal 3 vom unteren Kanal 2 durch eine Trennwand 1 getrennt sein, wobei die Kanalteile 2,3 gleich groß sind und die Trennwand 1 das eintretende Medium in zwei Ströme teilt.At the level of the central inlet A, the upper channel 3 can be separated from the lower channel 2 by a partition wall 1, the channel parts 2, 3 being of the same size and the partition wall 1 dividing the medium entering into two streams.

Die durch die Ansaugöffnung D der unteren Pumpe angeforderte Menge an Medium ist größer als der direkt durch den Kanal 2 bereitgestellte Anteil. Hierdurch entsteht ein Unterdruck in dem unteren Bereich des Raumes. Dieser bewirkt ein Ansaugen von Medium aus den teilsegmentförmigen Kammern 6 und 7 durch die Seitenöffnungen 8 und 9 am Ende des Kanals 2. Die herbeigeführte Zirkulation bewirkt ein Mitreißen der in den Kammern 6 und 7 gesammelten Luft durch die Öffnungen des Kanals 2. Weiterhin gelangt die sich im oberen Motor gesammelte Luft durch die Ansaugöffnung (Saugstutzen) E in die zu entlüftenden Kammern und wird zum großen Teil zusätzlich abgeführt.The quantity of medium requested through the suction opening D of the lower pump is greater than the proportion provided directly through channel 2. This creates a vacuum in the lower area of the room. This causes medium to be sucked out of the part-segment-shaped chambers 6 and 7 through the side openings 8 and 9 at the end of the channel 2. The circulation which is brought about causes the air collected in the chambers 6 and 7 to be carried through the openings of the channel 2. Furthermore, the Air collected in the upper engine through the intake opening (intake port) E into the chambers to be vented and is largely discharged.

Die Profile bzw. die rippenförmigen Leitelemente 10 beschleunigen die Luftabscheidung. Sie wandeln zum einen die sich im Raum großflächig angesammelte Luft in kleine Luftblasen um und erhöhen durch eine Düsenwirkung die in den Teilsegmenten 6 und 7 herbeigeführte Zirkulation des Mediums.The profiles or the rib-shaped guide elements 10 accelerate the air separation. On the one hand, they convert the air that has accumulated over a large area into small air bubbles and increase the circulation of the medium brought about in subsegments 6 and 7 by means of a nozzle effect.

Die obere Pumpe ist damit frei von Luft und läuft jederzeit problemlos an.The upper pump is therefore free of air and starts up at any time without any problems.

Claims (10)

1. Doppelpumpe mit einem Einlaß (A) für beide Pumpen, von dem ein Einlaßkanal zu beiden Ausgangsöffnungen der zwei Pumpen verzweigt, dadurch gekennzeichnet, daß der Einlaßkanal (2,3) vor und/oder hinter der Verzweigung seitlich mindestens eine zu einer Kammer (6,7) oder zu einem Seitenkanal führende Öffnung (4,5,8,9) aufweist, durch die in der Kammer bzw. in dem Seitenkanal ein Unterdruck erzeugbar ist, wobei das Innere der nicht laufenden Pumpe mit der Kammer/dem Seitenkanal verbunden ist, so daß Luft aus der nicht laufenden Pumpe ansaugbar ist.1. Double pump with an inlet (A) for both pumps, from which an inlet duct branches to both outlet openings of the two pumps, characterized in that the inlet duct (2, 3) in front of and / or behind the branching laterally at least one to a chamber ( 6.7) or leading to a side channel opening (4,5,8,9) through which a vacuum can be generated in the chamber or in the side channel, the inside of the non-running pump being connected to the chamber / side channel is so that air can be drawn in from the non-running pump. 2. Doppelpumpe nach Anspruch 1, dadurch gekennzeichnet, daß das Innere der nicht laufenden Pumpe (14) über deren Ansaugöffnung (E) und mindestens eine Seitenöffnung (4,5) mit der Kammer/dem Seitenkanal (6,7) verbunden ist.2. Double pump according to claim 1, characterized in that the interior of the non-running pump (14) via its suction opening (E) and at least one side opening (4,5) with the chamber / the side channel (6,7) is connected. 3. Doppelpumpe nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß zu zwei Seiten des Einlaßkanals (2,3) eine Kammer/ein Seitenkanal (6,7) angeordnet ist.3. Double pump according to claim 1 or 2, characterized in that a chamber / a side channel (6,7) is arranged on two sides of the inlet channel (2,3). 4. Doppelpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, .daß der Einlaßkanal (2,3) die beiden Ansaugöffnungen (E,D) beider Pumpen (13,14) miteinander verbindet und nahe jeder Ansaugöffnung jeweils mindestens eine Seitenöffnung (4,5,8,9) aufweist.4. Double pump according to one of the preceding claims, characterized in that the inlet channel (2, 3) connects the two suction openings (E, D) of both pumps (13, 14) to one another and near each suction opening in each case at least one side opening (4, 5 , 8.9). 5. Doppelpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß der Einlaßkanal (2,3) nahe jeder Ansaugöffnung (E,D) jeweils zwei einander gegenüberliegende Seitenöffnungen (4,5,8,9) aufweist, die jeweils in eine Kammer/einen Seitenkanal (6,7) führen.5. Double pump according to one of the preceding claims, characterized in that the inlet channel (2,3) near each suction opening (E, D) each have two mutually opposite side openings (4,5,8,9), each in a chamber / guide a side channel (6,7). 6. Doppelpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß der Einlaß (A) und die Auslässe (11,12) der Doppelpumpe in einer Ebene (Anschlußfläche 15) liegen, die an der flachen Seitenwand eines Verbrauchers befestigbar ist, wobei der Einlaßkanal (2,3) diametral die Ebene durchquert und sowohl die seitlich des Einlaßkanals liegenden Kammern/Seitenkanäle (6,7) als auch der Einlaßkanal (2,3) sich in die Ebene (15) öffnen, die durch die Seitenwand des Verbrauchers verschließbar ist.6. Double pump according to one of the preceding claims, characterized in that the inlet (A) and the outlets (11, 12) of the double pump lie in one plane (connecting surface 15) which can be fastened to the flat side wall of a consumer, the inlet channel (2,3) diametrically crosses the plane and both the chambers / side channels (6,7) lying to the side of the inlet channel and the inlet channel (2,3) open into the plane (15), which can be closed by the side wall of the consumer . 7. Doppelpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß in der Kammer/dem Seitenkanal (6,7) rippenförmige Leitelemente (10) in Strömungsrichtung angeordnet sind.7. Double pump according to one of the preceding claims, characterized in that in the chamber / the side channel (6,7) rib-shaped guide elements (10) are arranged in the flow direction. 8. Doppelpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß die zwei Kammern/Seitenkanäle (6,7) und der zwischen ihnen liegende, sie trennende diametrale Einlaßkanal (2,3) zusammen eine hohle Kreisscheibe bilden, die durch die Verbraucherseitenwand verschließbar ist.8. Double pump according to one of the preceding claims, characterized in that the two chambers / side channels (6, 7) and the diametrical inlet channel (2, 3) between them form a hollow circular disc which can be closed by the consumer side wall . 9. Doppelpumpe nach Anspruch 8, dadurch gekennzeichnet, daß die Achse der Kreisscheibe parallel zu den Achsen der Laufräder beider Pumpen liegt.9. Double pump according to claim 8, characterized in that the axis of the circular disc is parallel to the axes of the impellers of both pumps. 10. Doppelpumpe nach einem der vorigen Ansprüche, dadurch gekennzeichnet, daß der Einlaßkanal (2,3) in Höhe des Einlasses (A) durch eine Trennwand (1) in zwei gleich große, jeweils zu einer Ansaugöffnung (E,D) führende Abschnitte getrennt ist, so daß die Trennwand (1) das eintretende Medium in zwei Ströme teilt.10. Double pump according to one of the preceding claims, characterized in that the inlet channel (2,3) at the level of the inlet (A) by a partition (1) in two equal, each leading to a suction opening (E, D) separated sections is, so that the partition (1) divides the medium into two streams.
EP95101520A 1994-02-07 1995-02-04 Double pump Expired - Lifetime EP0667455B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4403697A DE4403697A1 (en) 1994-02-07 1994-02-07 Double pump
DE4403697 1994-02-07

Publications (2)

Publication Number Publication Date
EP0667455A1 true EP0667455A1 (en) 1995-08-16
EP0667455B1 EP0667455B1 (en) 1998-01-14

Family

ID=6509629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101520A Expired - Lifetime EP0667455B1 (en) 1994-02-07 1995-02-04 Double pump

Country Status (2)

Country Link
EP (1) EP0667455B1 (en)
DE (2) DE4403697A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19702477B4 (en) * 1997-01-24 2006-02-02 Wilo Ag double pump
EP1079113B1 (en) * 1999-08-21 2004-10-13 Grundfos A/S Centrifugal pump casing for a circulating pump for two fluid circuits
DE102012204212B4 (en) * 2012-03-16 2024-02-29 Mahle International Gmbh Pump module with a housing

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2105733A5 (en) * 1970-09-18 1972-04-28 Materiel Telephonique
US4738584A (en) * 1986-07-28 1988-04-19 Carl Price Multiple impeller pump
EP0464355A2 (en) * 1990-07-06 1992-01-08 WILO GmbH Duplex centrifugal pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2376309A1 (en) * 1977-01-04 1978-07-28 Materiel Telephonique DEVICE FOR ADJUSTING THE PASSAGE AND THE FLOW OF A HYDRAULIC FLOW, ITS MOUNTING PROCESS IN A TWIN TYPE CIRCULATION PUMP

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2105733A5 (en) * 1970-09-18 1972-04-28 Materiel Telephonique
US4738584A (en) * 1986-07-28 1988-04-19 Carl Price Multiple impeller pump
EP0464355A2 (en) * 1990-07-06 1992-01-08 WILO GmbH Duplex centrifugal pump

Also Published As

Publication number Publication date
EP0667455B1 (en) 1998-01-14
DE4403697A1 (en) 1995-08-10
DE59501232D1 (en) 1998-02-19

Similar Documents

Publication Publication Date Title
DE3020031C2 (en) Evaporative humidifier
EP2505842A1 (en) Multi stage centrifugal pump system
DE2346286B2 (en) Device for gas separation
DE2841906C2 (en) Liquid ring compressor or vacuum pump
EP0874201B1 (en) Assembly for a compact heating installation
EP0667455A1 (en) Double pump
DE3813654A1 (en) Circulation pump
DE3141080C2 (en) "Self-priming centrifugal pump"
DE3517493A1 (en) SCREW COMPRESSOR SYSTEM IN A COMPACT HOUSING
DE2237108C2 (en) DOUBLE PUMP UNIT
EP3364043A1 (en) Pump unit with integrated air venting and liquid purge device
EP1087143B1 (en) Submersible pump
DE2629337C2 (en) Vane vacuum pump
DE2401261C3 (en)
DE4423149C2 (en) Multi-stage free-flow pump
DE4136348B4 (en) pump
DE60101764T2 (en) Vehicle air conditioning
DE3830542A1 (en) Centrifugal pump
EP2944825A1 (en) Pump housing with three supports
DE4438686C2 (en) Gas cleaning device
EP0866280B1 (en) Connection adapter
DE102007061558A1 (en) Centrifugal pump with ventilation
DE69916087T2 (en) FILTER FOR FAN WITH HIGH FILTER PERFORMANCE, LOW ENERGY CONSUMPTION AND LOW NOISE EXHAUST
DE2705977A1 (en) Ventilator with adjustable outlet openings - has radial flow pump supplying multiple selectable outlets in periphery of rectangular housing
DE29818704U1 (en) Motor-driven double pump of the centrifugal pump type

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE DE FR IT NL

17P Request for examination filed

Effective date: 19950905

17Q First examination report despatched

Effective date: 19960708

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR IT NL

REF Corresponds to:

Ref document number: 59501232

Country of ref document: DE

Date of ref document: 19980219

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: SOCIETA' ITALIANA BREVETTI S.P.A.

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050204

NLT1 Nl: modifications of names registered in virtue of documents presented to the patent office pursuant to art. 16 a, paragraph 1

Owner name: WILO AG

PGRI Patent reinstated in contracting state [announced from national office to epo]

Ref country code: IT

Effective date: 20080301

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20090203

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20090225

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20090217

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20090213

Year of fee payment: 15

BERE Be: lapsed

Owner name: *WILO G.M.B.H.

Effective date: 20100228

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20100901

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20101029

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100901

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100204

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20120131

Year of fee payment: 18

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59501232

Country of ref document: DE

Effective date: 20130903

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130903