EP2161455A1 - Double pump - Google Patents

Double pump Download PDF

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Publication number
EP2161455A1
EP2161455A1 EP08015575A EP08015575A EP2161455A1 EP 2161455 A1 EP2161455 A1 EP 2161455A1 EP 08015575 A EP08015575 A EP 08015575A EP 08015575 A EP08015575 A EP 08015575A EP 2161455 A1 EP2161455 A1 EP 2161455A1
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EP
European Patent Office
Prior art keywords
inflow
return
double pump
flow
inflow surface
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Granted
Application number
EP08015575A
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German (de)
French (fr)
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EP2161455B1 (en
Inventor
Niels Kristian Bach Andersen
Michael Høyer Lillelund
Jørgen Schmidt
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Grundfos Management AS
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Grundfos Management AS
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Priority to EP08015575.7A priority Critical patent/EP2161455B1/en
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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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves
    • 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 the features specified in the preamble of claim 1 and a non-return valve for such a double pump or other branching.
  • Double pumps are particularly state of the art as heating circulation pumps and serve to ensure the pumping capacity even in the event of a pump failure.
  • the second pump of the double pump can be switched on and take over the pump function.
  • a return flow of the pumped medium into the failed first centrifugal pump and thus a short-circuit current is to be avoided.
  • double pumps regularly have a non-return valve, which closes the output of the non-active pump.
  • These check valves are usually flow controlled, i. They are controlled by the flow of the pumped medium in their respective closed or open position and held there.
  • Such a double pump with a flow-controlled non-return valve is manufactured under the type name MAGNA-UPE (D) 32-120F from Grundfos.
  • the double pump according to the invention has two pumps, the pressure-side lines open into a common output line. Further, it has a flow-controlled non-return valve arranged in the mouth region of the pressure-side lines, which closes the other, second, pressure-side line when a first pressure-side line flows through.
  • the non-return flap of the double pump has at least one in the closed position in the flow path projecting inflow surface, which is facing upstream. In this closed position, the flow path is formed by the first pressure-side line and the common output line. On a so-directed inflow area acts by the flow in the flow path, a force which is directed obliquely to transversely to the main flow direction of the flow path. In this way, the check valve located in its closed position by the flow of the inflow even more force in its closed position force, namely by the force resulting from the flow.
  • the inflow area is formed by a spoiler arranged on the non-return flap.
  • a spoiler arranged on the non-return flap.
  • the inflow surfaces are each surrounded by a sealing surface in the double pump.
  • This embodiment is particularly useful for the double pump described above.
  • the check valve in each closed position with its sealing surface tightly against the respective output of a pump and also be subjected to force in each of its closed position by flow.
  • the arrangement of the sealing surface allows a uniform application of force to the sealing surface in the direction of a contact surface.
  • the inflow surface is in a sealing surface formed in this way almost the entire flat side of the flap available, so that the sealing surface in the design and design of the inflow surface forms virtually no restriction.
  • the inflow surface is curved uniaxially, wherein on the one hand the axis of curvature is arranged parallel to the pivot axis of the flap and on the other hand, the curved inflow surface is arranged concavely to the flow path.
  • the flap is curved in such a way that the upstream surface merges with a nearly smooth transition as steadily as possible into a flat side of the non-return flap upstream. In such an embodiment, an efficient application of force to the non-return valve can be achieved with simultaneously extremely low flow resistance.
  • the solution according to the invention is not limited to the check valve of a double pump, but can also be used in a check valve for any other branching.
  • the non-return valve on at least one inflow, which obliquely to the longitudinal center plane the non-return flap is oriented and remote from the pivot axis of the non-return flap of the longitudinal center plane is further spaced than near the pivot axis. If the non-return valve according to the invention is arranged in a line branch in such a way that it closes the other line branch when a line branch flows through it, the leading surface advantageously effects an increased application of force to the non-return valve in this closed position.
  • the force required for this results from the flow in the flow path formed by the flow-through line branch.
  • a non-return flap is regularly oriented such that the pivot axis passes through an upstream part of the non-return flap.
  • the inflow surface of the check valve according to the invention downstream is further spaced from the longitudinal center plane of the check valve than at an upstream region of the non-return valve. Accordingly, the inflow surface of the non-return valve in the closed position protrudes into the flow path in such a way that it faces upstream.
  • the flow of the inflow surface in the flow path generates a force that controls the non-return valve much stronger than known check valves in their closed position. In this way, the check valve closes reliably even at low delivery pressure and high flow.
  • double pump 5 is a heating circulation pump.
  • the double pump 5 has an input line 7, the two in a common housing 8 arranged centrifugal pumps 10, 15 feeds.
  • the common input line 7 branches into two supply lines, each of which opens into a suction mouth of the two pumps 10, 15 (not shown in the drawing).
  • the two suction orifices each feed an impeller 16, 17 of the two pumps from which the delivery fluid exits radially and subsequently via two screw housings 18, 19 to two pressure-side lines 20, 25 of the pumps 10, 15 passes.
  • These two pressure-side lines 20, 25 open into an orifice region 27 in a common outlet line 30 of the double pump 5.
  • a non-return valve 35 is pivotally mounted about an axis 40.
  • the check valve 35 can in each case a line 20, 25 of the two pumps 10, 15 close. Therefore, the non-return valve 35 is formed on both flat sides 45, 50 for engagement with a respective contact surface 55, 60 of the two pressure-side lines 20, 25.
  • the non-return valve 35 on its two flat sides 45, 50, two sealing surfaces 65, 70, which with the contact surfaces 55, 60 a dense Allow closure of the conduit 20 or the conduit 25.
  • the sealing surfaces 65, 70 are formed by the flat sides of the non-return valve 35.
  • the sealing surface only in the system area, that is to say, for example, in the area of a peripheral edge of the non-return flap 35.
  • the check valve 35 closes the right-hand pressure-side line 25 of the right pump 15, so that the left-hand pressure-side line 20 of the left pump 10 with the common output line 30 forms a flow path 75.
  • the check valve 35 has on its flat sides 45, 50 in each case an inflow surface 80, 85, of which the inflow surface 80, which is close to the flow path 75, projects into the flow path 75.
  • This is the left inflow surface 80.
  • the design of the inflow surfaces 80, 85 can Fig. 2 be removed.
  • one of two spoilers 90, 95 is attached to the two flat sides 45, 50, whose sides 80, 85 remote from the longitudinal center plane of the non-return flap 35 form the inflow surfaces 80, 85.
  • the inflow surfaces 80, 85 pass steadily and smoothly into the flat sides 45, 50 of the non-return flap 35 at their sides close to the pivot axis 40.
  • the spoilers 90, 95 are substantially thin and flat educated.
  • the spoiler 90, 95 with supports 100 are supported by the flat sides 45, 50 of the non-return valve 35.
  • spoiler 95, support 100 and check valve 35 are integrally formed.
  • the sealing surfaces 65, 70 are formed by those surface areas on the flat sides 45, 50, which surround the spoiler 90, 95.
  • the double pump 5 described above has at high flow rates a higher flow rate than comparable double pumps according to the prior art, as shown in the diagram Fig. 3 can be removed.
  • the delivery head H is shown as a function of the delivery flow Q of the previously described pump (solid curve 120).
  • the diagram also includes a corresponding curve 117 for a double pump according to the prior art (dashed curve).
  • the curves overlap, ie the pumps operate with equal effect. Only from a point 115, the pump curve 117 drops significantly for the double pump according to the prior art.
  • the double pump or non-return valve ensures, as the curve 120 shows, that the shape of the pump curve avoids this steep drop and compared to the pump curve 117, especially in the range of large flow rates and small heads, a higher flow rate, since the check valve also closes tight in this area and thus no or at least lower short-circuit currents occur.

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

Abstract

The dual pump (5) has pipes (20, 25) ending in a common outlet pipe (30). The pipes are provided at a high pressure side of two pumps (10, 15) of the dual pump. A check valve (35) is arranged in an opening region (27) in a flow controlled manner. One of the pipes blocks the other pipe during the flow. The check valve has two flow surfaces (80, 85) projecting in a flow path in a closing position. The flow surfaces are turned in an upstream manner. The flow surfaces are formed by a spoiler that is arranged at the check valve, and encircled by two sealing surfaces (65, 70).

Description

Die Erfindung betrifft eine Doppelpumpe mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen sowie eine Rückschlagklappe für eine solche Doppelpumpe oder eine andere Leitungsverzweigung.The invention relates to a double pump with the features specified in the preamble of claim 1 and a non-return valve for such a double pump or other branching.

Doppelpumpen zählen insbesondere als Heizungsumwälzpumpen zum Stand der Technik und dienen zur Sicherstellung der Pumpleistung auch bei Ausfall einer Pumpe. Bei Ausfall einer ursprünglich betriebenen ersten Pumpe kann die zweite Pumpe der Doppelpumpe zugeschaltet werden und die Pumpenfunktion übernehmen. An dem druckseitigen Ausgang der Doppelpumpe ist dabei eine Rückströmung des Fördermediums in die ausgefallene erste Kreiselpumpe und damit ein Kurzschlussstrom zu vermeiden. Zu diesem Zweck weisen Doppelpumpen regelmäßig eine Rückschlagklappe auf, welche den Ausgang der nicht aktiven Pumpe verschließt. Diese Rückschlagklappen sind üblicherweise strömungsgesteuert, d.h. sie werden durch die Anströmung des Fördermediums in ihre jeweilige Schließ- bzw. Offenstellung gesteuert und dort gehalten. Eine solche Doppelpumpe mit einer strömungsgesteuerten Rückschlagklappe wird unter der Typenbezeichnung MAGNA-UPE(D) 32-120F von der Firma Grundfos hergestellt.Double pumps are particularly state of the art as heating circulation pumps and serve to ensure the pumping capacity even in the event of a pump failure. In case of failure of an originally operated first pump, the second pump of the double pump can be switched on and take over the pump function. At the pressure-side outlet of the double pump, a return flow of the pumped medium into the failed first centrifugal pump and thus a short-circuit current is to be avoided. For this purpose, double pumps regularly have a non-return valve, which closes the output of the non-active pump. These check valves are usually flow controlled, i. They are controlled by the flow of the pumped medium in their respective closed or open position and held there. Such a double pump with a flow-controlled non-return valve is manufactured under the type name MAGNA-UPE (D) 32-120F from Grundfos.

Insbesondere bei hohen Förderströmen, wenn der Förderdruck vergleichsweise gering ist, verschließen strömungsgesteuerte Rückschlagklappen den jeweils anderen Ausgang der Doppelpumpe nicht vollständig. Der unzureichende Verschluss resultiert aus der bei hohen Förderströmen verringerten Druckdifferenz zwischen Druck- und Saugseite, welche zu einer geringeren Kraftbeaufschlagung der Rückschlagklappe führt. Durch den unzureichenden Verschluss der Rückschlagklappe entstehen Kurzschlussströme, die die Förderleistung vermindern. Doch auch bei anderen Drehzahlen kann es aufgrund von Resonanzen oder anderen Effekten dazu kommen, dass die Rückschlagklappe nicht dicht schließt. Es wird daher in Betriebsanleitungen bekannter Doppelpumpen regelmäßig darauf hingewiesen, in welchen Drehzahlbereichen die Pumpe nicht betrieben werden sollte, um dies zu vermeiden.Especially at high flow rates, when the delivery pressure is comparatively low, flow-controlled check valves do not completely close the respective other output of the double pump. The insufficient closure results from the reduced pressure difference between the pressure and suction side at high flow rates, which results in less force being applied to the non-return valve leads. The inadequate closure of the non-return valve results in short-circuit currents that reduce the flow rate. But even at other speeds, it may happen because of resonances or other effects that the check valve does not close tightly. It is therefore regularly noted in operating instructions known double pumps in which speed ranges the pump should not be operated to avoid this.

Es ist daher Aufgabe der Erfindung, eine Doppelpumpe, insbesondere die Rückschlagklappe einer Doppelpumpe so auszubilden, dass die Dichtfunktion insbesondere auch bei geringem Druck gewährleistet ist.It is therefore an object of the invention to form a double pump, in particular the non-return valve of a double pump so that the sealing function is ensured in particular even at low pressure.

Diese Aufgabe wird durch eine Rückschlagklappe mit den in Anspruch 6 angegebenen Merkmalen sowie durch eine Doppelpumpe mit einer solchen Rückschlagklappe gemäß Anspruch 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen, der nachfolgenden Beschreibung und der Zeichnung.This object is achieved by a non-return valve having the features specified in claim 6 and by a double pump with such a non-return valve according to claim 1. Advantageous developments of the invention will become apparent from the dependent claims, the following description and the drawings.

Die erfindungsgemäße Doppelpumpe weist zwei Pumpen auf, deren druckseitige Leitungen in einer gemeinsamen Ausgangsleitung münden. Ferner weist sie eine im Mündungsbereich der druckseitigen Leitungen angeordnete strömungsgesteuerte Rückschlagklappe auf, die bei Durchströmung einer ersten druckseitigen Leitung die andere, zweite, druckseitige Leitung verschließt. Erfindungsgemäß weist die Rückschlagklappe der Doppelpumpe mindestens eine in Schließstellung in den Strömungspfad ragende Anströmfläche auf, welche stromaufwärts gewandt ist. In dieser Schließstellung ist der Strömungspfad durch die erste druckseitige Leitung und die gemeinsame Ausgangsleitung gebildet. Auf eine derart orientierte Anströmfläche wirkt durch die Anströmung im Strömungspfad eine Kraft, welche schräg bis quer zur Haupströmungsrichtung des Strömungspfades gerichtet ist. Auf diese Weise wird die in ihrer Schließstellung befindliche Rückschlagklappe durch die Anströmung der Anströmfläche deutlich stärker in ihre Schließstellung zusätzlich kraftbeaufschlagt, nämlich durch die aus der Anströmung resultierende Kraft.The double pump according to the invention has two pumps, the pressure-side lines open into a common output line. Further, it has a flow-controlled non-return valve arranged in the mouth region of the pressure-side lines, which closes the other, second, pressure-side line when a first pressure-side line flows through. According to the invention, the non-return flap of the double pump has at least one in the closed position in the flow path projecting inflow surface, which is facing upstream. In this closed position, the flow path is formed by the first pressure-side line and the common output line. On a so-directed inflow area acts by the flow in the flow path, a force which is directed obliquely to transversely to the main flow direction of the flow path. In this way, the check valve located in its closed position by the flow of the inflow even more force in its closed position force, namely by the force resulting from the flow.

Dies ist insbesondere bei hohen Förderströmen relevant, bei welchen Rückschlagklappen bekannter Doppelpumpen nur unzureichend schließen. Bei der erfindungsgemäßen Doppelpumpe kann die Anströmfläche aus der Anströmung im Strömungspfad auch bei hohen Förderströmen bzw. bei geringen Förderdrücken eine für den Rückschlagklappenverschluss ausreichende Schließkraft aufbringen. Damit lässt sich bei der Doppelpumpe gemäß dieser Erfindung ein wesentlich verbesserter Klappenverschluss und daher bei geringen Förderdrücken eine deutlich erhöhte Förderleistung erzielen. Eine mit der erfindungsgemäßen Rückschlagklappe ausgestattete Doppelpumpe kann somit über den gesamten Drehzahlbereich betrieben werden, ohne dass bestimmte Drehzahlbereiche wegen mangelhaft schließender Rückschlagklappe und damit schlechteren Wirkungsgrad der Pumpe nicht angefahren werden sollten.This is particularly relevant for high flow rates, in which check valves of known double pumps close inadequate. In the case of the double pump according to the invention, the inflow area from the inflow in the flow path can apply a closing force sufficient for the check flap closure even at high delivery flows or at low delivery pressures. Thus, in the double pump according to this invention, a significantly improved flap closure and therefore at low delivery pressures achieve a significantly increased delivery rate. A equipped with the non-return valve according to the invention double pump can thus be operated over the entire speed range, without certain speed ranges should not be approached because of poorly closing check valve and thus poorer efficiency of the pump.

Vorteilhaft ist bei der Doppelpumpe die Anströmfläche durch einen an der Rückschlagklappe angeordneten Spoiler gebildet. Eine derart ausgebildete Anströmfläche erlaubt eine geeignete Anpassung der Anströmfläche an den jeweiligen Einsatzzweck bzw. Pumpentyp, da die Anströmfläche weitgehend unabhängig von den geometrischen Abmessungen der Rückschlagklappe ausgelegt werden kann.Advantageously, in the double pump, the inflow area is formed by a spoiler arranged on the non-return flap. Such a trained inflow area allows a suitable adaptation of the inflow surface to the respective application or pump type, since the inflow surface can be designed largely independent of the geometric dimensions of the check valve.

Bevorzugt weist bei der Doppelpumpe die Rückschlagklappe an ihren beiden voneinander abgewandten Flachseiten jeweils eine Anströmfläche auf. Dies ist insbesondere für Rückschlagklappen relevant, welche wechselseitig jeweils einen Ausgang einer Pumpe verschließen können und dazu zwei Schließstellungen aufweisen. Mit der Ausbildung jeweils einer Anströmfläche an den beiden voneinander abgewandten Flachseiten der Rückschlagklappe ist diese in jeder Schließstellung strömungskraftbeaufschlagbar.In the case of the double pump, the non-return flap preferably has an inflow surface at its two flat sides facing away from one another. This is particularly relevant for non-return valves, which can each mutually close an outlet of a pump and to have two closed positions. With the formation of a respective inflow surface at the two facing away from each other Flat sides of the non-return valve is strömungskraftbeaufschlagbar in each closed position.

Vorteilhaft sind bei der Doppelpumpe die Anströmflächen jeweils von einer Dichtfläche umgeben. Diese Ausgestaltung ist für die zuvor beschriebene Doppelpumpe besonders zweckmäßig. So kann die Rückschlagklappe in jeder Schließstellung mit ihrer Dichtfläche dicht an dem jeweiligen Ausgang einer Pumpe anliegen und daneben auch in jede ihrer Schließstellung durch Anströmung kraftbeaufschlagt werden. Die Anordnung der Dichtfläche erlaubt dabei eine gleichmäßige Kraftbeaufschlagung der Dichtfläche in Richtung auf eine Anlagefläche. Darüber hinaus steht der Anströmfläche bei einer derart ausgebildeten Dichtfläche nahezu die gesamte Flachseite der Klappe zur Verfügung, so dass die Dichtfläche bei der Auslegung und Ausgestaltung der Anströmfläche praktisch keine Einschränkung bildet.Advantageously, the inflow surfaces are each surrounded by a sealing surface in the double pump. This embodiment is particularly useful for the double pump described above. Thus, the check valve in each closed position with its sealing surface tightly against the respective output of a pump and also be subjected to force in each of its closed position by flow. The arrangement of the sealing surface allows a uniform application of force to the sealing surface in the direction of a contact surface. In addition, the inflow surface is in a sealing surface formed in this way almost the entire flat side of the flap available, so that the sealing surface in the design and design of the inflow surface forms virtually no restriction.

In einer bevorzugten Ausgestaltung ist die Anströmfläche einachsig gekrümmt, wobei zum einen die Krümmungsachse parallel zur Schwenkachse der Klappe angeordnet ist und zum anderen die gekrümmte Anströmfläche zum Strömungspfad hin konkav angeordnet ist. Besonders bevorzugt ist die Klappe derart gekrümmt, dass die Anströmfläche stromaufwärts mit einem nahezu glatten Übergang möglichst stetig in eine Flachseite der Rückschlagklappe übergeht. In einer derartigen Ausgestaltung lässt sich eine effiziente Kraftbeaufschlagung der Rückschlagklappe bei gleichzeitig äußerst geringem Strömungswiderstand erreichen.In a preferred embodiment, the inflow surface is curved uniaxially, wherein on the one hand the axis of curvature is arranged parallel to the pivot axis of the flap and on the other hand, the curved inflow surface is arranged concavely to the flow path. Particularly preferably, the flap is curved in such a way that the upstream surface merges with a nearly smooth transition as steadily as possible into a flat side of the non-return flap upstream. In such an embodiment, an efficient application of force to the non-return valve can be achieved with simultaneously extremely low flow resistance.

Die erfindungsgemäße Lösung ist jedoch nicht auf die Rückschlagklappe einer Doppelpumpe beschränkt, sondern kann auch bei einer Rückschlagklappe für eine beliebige andere Leitungsverzweigung eingesetzt werden. Dabei weist erfindungsgemäß die Rückschlagklappe mindestens eine Anströmfläche auf, welche schräg zur Längsmittelebene der Rückschlagklappe orientiert ist und fern der Schwenkachse der Rückschlagklappe von der Längsmittelebene weiter beabstandet ist als nahe der Schwenkachse. Ordnet man die erfindungsgemäße Rückschlagklappe derart in einer Leitungsverzweigung an, dass sie bei der Durchströmung eines Leitungszweiges den anderen Leitungszweig verschließt, so bewirkt die Anströmfläche vorteilhaft eine erhöhte Kraftbeaufschlagung der Rückschlagklappe in diese Schließstellung.However, the solution according to the invention is not limited to the check valve of a double pump, but can also be used in a check valve for any other branching. In this case, according to the invention, the non-return valve on at least one inflow, which obliquely to the longitudinal center plane the non-return flap is oriented and remote from the pivot axis of the non-return flap of the longitudinal center plane is further spaced than near the pivot axis. If the non-return valve according to the invention is arranged in a line branch in such a way that it closes the other line branch when a line branch flows through it, the leading surface advantageously effects an increased application of force to the non-return valve in this closed position.

Die dazu erforderliche Kraft resultiert dabei aus der Anströmung im durch den durchströmten Leitungszweig gebildeten Strömungspfad. An einem solchen Strömungspfad ist eine Rückschlagklappe regelmäßig derart orientiert, dass die Schwenkachse durch einen stromaufwärts gelegenen Teil der Rückschlagklappe verläuft. Damit ist die Anströmfläche der erfindungsgemäßen Rückschlagklappe stromabwärts weiter von der Längsmittelebene der Rückschlagklappe beabstandet als an einem stromaufwärtigen Bereich der Rückschlagklappe. Entsprechend ragt die Anströmfläche der Rückschlagklappe in Schließstellung derart in den Strömungspfad, dass sie stromaufwärts gewandt ist. Die Anströmung der Anströmfläche im Strömungspfad erzeugt eine Kraft, die die Rückschlagklappe deutlich stärker als bekannte Rückschlagklappen in ihre Schließstellung steuert. Auf diese Weise schließt die Rückschlagklappe auch bei geringem Förderdruck und hohem Förderstrom zuverlässig.The force required for this results from the flow in the flow path formed by the flow-through line branch. At such a flow path, a non-return flap is regularly oriented such that the pivot axis passes through an upstream part of the non-return flap. Thus, the inflow surface of the check valve according to the invention downstream is further spaced from the longitudinal center plane of the check valve than at an upstream region of the non-return valve. Accordingly, the inflow surface of the non-return valve in the closed position protrudes into the flow path in such a way that it faces upstream. The flow of the inflow surface in the flow path generates a force that controls the non-return valve much stronger than known check valves in their closed position. In this way, the check valve closes reliably even at low delivery pressure and high flow.

Bevorzugte Ausgestaltungen der erfindungsgemäßen Rückschlagklappe entsprechen denen, wie sie vorstehend anhand der Rückschlagklappe der erfindungsgemäßen Doppelpumpe beschrieben worden sind.Preferred embodiments of the non-return valve according to the invention correspond to those as described above with reference to the non-return valve of the double pump according to the invention.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels beschrieben. Es zeigen:

Fig. 1
eine erfindungsgemäße Doppelpumpe im Schnitt längs der druckseitigen Leitungen der beiden Pumpen,
Fig. 2
die Rückschlagklappe der Doppelpumpe gemäß Fig. 1 in einer perspektivischen Darstellung und
Fig. 3
eine grafische Darstellung des Zusammenhangs von Förderhöhe und Förderstrom für die Doppelpumpe gemäß Fig. 1 und für eine Doppelpumpe gemäß dem Stand der Technik.
The invention will be described with reference to an embodiment shown in the drawing. Show it:
Fig. 1
a double pump according to the invention in section along the pressure-side lines of the two pumps,
Fig. 2
the non-return valve of the double pump according to Fig. 1 in a perspective view and
Fig. 3
a graphical representation of the relationship of head and flow for the double pump according to Fig. 1 and for a double pump according to the prior art.

Bei der in Fig. 1 gezeigten Doppelpumpe 5 handelt es sich um eine Heizungsumwälzpumpe. Die Doppelpumpe 5 weist eine Eingangsleitung 7 auf, die zwei in einem gemeinsamen Gehäuse 8 angeordnete Kreiselpumpen 10, 15 speist. Dazu verzweigt die gemeinsame Eingangsleitung 7 in zwei Zuleitungen, die jeweils in einem Saugmund der beiden Pumpen 10, 15 münden (in der Zeichnung nicht dargestellt). Die beiden Saugmünder speisen je ein Laufrad 16, 17 der beiden Pumpen, aus denen die Förderflüssigkeit radial austritt und nachfolgend über zwei Schneckengehäuse 18, 19 zu zwei druckseitigen Leitungen 20, 25 der Pumpen 10, 15 gelangt. Diese beiden druckseitigen Leitungen 20, 25 münden in einem Mündungsbereich 27 in einer gemeinsamen Ausgangsleitung 30 der Doppelpumpe 5.At the in Fig. 1 shown double pump 5 is a heating circulation pump. The double pump 5 has an input line 7, the two in a common housing 8 arranged centrifugal pumps 10, 15 feeds. For this purpose, the common input line 7 branches into two supply lines, each of which opens into a suction mouth of the two pumps 10, 15 (not shown in the drawing). The two suction orifices each feed an impeller 16, 17 of the two pumps from which the delivery fluid exits radially and subsequently via two screw housings 18, 19 to two pressure-side lines 20, 25 of the pumps 10, 15 passes. These two pressure-side lines 20, 25 open into an orifice region 27 in a common outlet line 30 of the double pump 5.

Im Mündungsbereich 27 beider Leitungen 20, 25 ist eine Rückschlagklappe 35 um eine Achse 40 schwenkbar angeordnet. Die Rückschlagklappe 35 kann dabei jeweils eine Leitung 20, 25 der beiden Pumpen 10, 15 verschließen. Daher ist die Rückschlagklappe 35 an beiden Flachseiten 45, 50 zur Anlage an jeweils einer Anlagefläche 55, 60 der beiden druckseitigen Leitungen 20, 25 ausgebildet. Dazu weist die Rückschlagklappe 35 an ihren beiden Flachseiten 45, 50 zwei Dichtflächen 65, 70 auf, welche mit den Anlageflächen 55, 60 einen dichten Verschluss der Leitung 20 oder der Leitung 25 ermöglichen. In dem dargestellten Ausführungsbeispiel sind die Dichtflächen 65, 70 durch die Flachseiten der Rückschlagklappe 35 gebildet. Grundsätzlich reicht es jedoch aus, die Dichtfläche nur im Anlagenbereich, also beispielsweise im Bereich eines umlaufenden Randes der Rückschlagklappe 35 auszubilden. In der in Fig. 1 dargestellen Stellung verschließt die Rückschlagklappe 35 die rechte druckseitige Leitung 25 der rechten Pumpe 15, so dass die linke druckseitige Leitung 20 der linken Pumpe 10 mit der gemeinsamen Ausgangsleitung 30 einen Strömungspfad 75 ausbildet.In the mouth region 27 of both lines 20, 25, a non-return valve 35 is pivotally mounted about an axis 40. The check valve 35 can in each case a line 20, 25 of the two pumps 10, 15 close. Therefore, the non-return valve 35 is formed on both flat sides 45, 50 for engagement with a respective contact surface 55, 60 of the two pressure-side lines 20, 25. For this purpose, the non-return valve 35 on its two flat sides 45, 50, two sealing surfaces 65, 70, which with the contact surfaces 55, 60 a dense Allow closure of the conduit 20 or the conduit 25. In the illustrated embodiment, the sealing surfaces 65, 70 are formed by the flat sides of the non-return valve 35. In principle, however, it is sufficient to design the sealing surface only in the system area, that is to say, for example, in the area of a peripheral edge of the non-return flap 35. In the in Fig. 1 illustrated position, the check valve 35 closes the right-hand pressure-side line 25 of the right pump 15, so that the left-hand pressure-side line 20 of the left pump 10 with the common output line 30 forms a flow path 75.

Die Rückschlagklappe 35 weist an ihren Flachseiten 45, 50 jeweils eine Anströmfläche 80, 85 auf, von denen diejenige Anströmfläche 80, welche dem Strömungspfad 75 nahe ist, in den Strömungspfad 75 hineinragt. In der in Fig. 1 dargestellten Stellung ist dies die linke Anströmfläche 80. Dabei ist die Anströmfläche 80 stromaufwärts, d. h. in Richtung zur linken Pumpe 10, gewandt. Daher wirkt bei Anströmung der Anströmfläche 80 im Strömungspfad 75 eine Kraft auf die Rückschlagklappe 35, welche schräg zur Hauptströmungsrichtung 88 und damit in die jeweilige Schließstellung gerichtet ist. Da die Anströmflächen 80, 85 mit einem deutlich größeren Winkel zur Hauptströmungsrichtung 88 des Strömungspfades 75 in den Strömungspfad 75 hineinragen, als die Flachseiten 45, 50 der Rückschlagklappen, resultieren aus der Anströmung der Anströmflächen 80, 85 erheblich größere Kräfte in die jeweilige Schließstellung verglichen mit bekannten Rückschlagklappen.The check valve 35 has on its flat sides 45, 50 in each case an inflow surface 80, 85, of which the inflow surface 80, which is close to the flow path 75, projects into the flow path 75. In the in Fig. 1 This is the left inflow surface 80. In this case, the inflow surface 80 upstream, ie in the direction of the left pump 10, turned. Therefore acts on flow of the inflow surface 80 in the flow path 75, a force on the check valve 35, which is directed obliquely to the main flow direction 88 and thus in the respective closed position. Since the inflow surfaces 80, 85 protrude into the flow path 75 at a significantly greater angle to the main flow direction 88 of the flow path 75 than the flat sides 45, 50 of the non-return flaps, the flow of the inflow surfaces 80, 85 results in considerably greater forces in the respective closed position compared with FIG known check valves.

Die Ausgestaltung der Anströmflächen 80, 85 kann Fig. 2 entnommen werden. Hier ist an den beiden Flachseiten 45, 50 jeweils einer von zwei Spoilern 90, 95 befestigt, deren von der Längsmittelebene der Rückschlagklappe 35 abgewandte Seiten 80, 85 die Anströmflächen 80, 85 bilden. Die Anströmflächen 80, 85 gehen an ihren der Schwenkachse 40 nahen Seiten stetig und glatt in die Flachseiten 45, 50 der Rückschlagklappe 35 über. Die Spoiler 90, 95 sind im Wesentlichen dünn und flächig ausgebildet. Dabei stützen sich die Spoiler 90, 95 mit Stützen 100 von den Flachseiten 45, 50 der Rückschlagklappe 35 ab. In der dargestellen Ausführungsform sind Spoiler 95, Stütze 100 und Rückschlagklappe 35 einteilig ausgebildet. Die Dichtflächen 65, 70 sind dabei durch diejenigen Flächenbereiche an den Flachseiten 45, 50 gebildet, die die Spoiler 90, 95 umgeben.The design of the inflow surfaces 80, 85 can Fig. 2 be removed. Here, one of two spoilers 90, 95 is attached to the two flat sides 45, 50, whose sides 80, 85 remote from the longitudinal center plane of the non-return flap 35 form the inflow surfaces 80, 85. The inflow surfaces 80, 85 pass steadily and smoothly into the flat sides 45, 50 of the non-return flap 35 at their sides close to the pivot axis 40. The spoilers 90, 95 are substantially thin and flat educated. In this case, the spoiler 90, 95 with supports 100 are supported by the flat sides 45, 50 of the non-return valve 35. In the dargestellen embodiment spoiler 95, support 100 and check valve 35 are integrally formed. The sealing surfaces 65, 70 are formed by those surface areas on the flat sides 45, 50, which surround the spoiler 90, 95.

Die zuvor beschriebene Doppelpumpe 5 weist bei hohen Förderströmen eine höhere Förderleistung als vergleichbare Doppelpumpen gemäß dem Stand der Technik auf, wie aus dem Diagramm gemäß Fig. 3 entnommen werden kann. In dem Diagramm ist die Förderhöhe H in Abhängigkeit vom Förderstrom Q der zuvor beschriebenen Pumpe dargestellt (durchgezogene Kurve 120). Zum Vergleich enthält das Diagramm zudem eine entsprechende Kurve 117 für eine Doppelpumpe gemäß dem Stand der Technik (gestrichelte Kurve). Im Bereich großer Förderhöhen, also im Diagramm im linken Bereich überdecken sich die Kurven, d. h. die Pumpen arbeiten gleichwirkend. Erst ab einem Punkt 115 fällt die Pumpenkurve 117 für die Doppelpumpe gemäß dem Stand der Technik deutlich ab. Dies resultiert daraus, dass mit zunehmendem Druckabfall bei steigender Fördermenge die auf die Klappe wirkende druckbedingte Schließkraft abnimmt, so dass dann bei über den Punkt 115 hinausgehenden zunehmenden Förderströmen und weiter abfallendem Druck die Klappe nicht mehr dicht schließt und ein Teil des Förderstroms durch die abgeschaltete Pumpe zurückfließt. Die erfindungsgemäße Doppelpumpe bzw. Rückschlagklappe sorgt hingegen, wie die Kurve 120 belegt, dafür, dass die Form der Pumpenkurve diesen steilen Abfall vermeidet und gegenüber der Pumpenkurve 117, insbesondere im Bereich großer Förderströme und kleiner Förderhöhen, eine höhere Förderleistung aufweist, da die Rückschlagklappe auch in diesem Bereich dicht schließt und somit keine oder zumindest geringere Kurzschlussströme entstehen.The double pump 5 described above has at high flow rates a higher flow rate than comparable double pumps according to the prior art, as shown in the diagram Fig. 3 can be removed. In the diagram, the delivery head H is shown as a function of the delivery flow Q of the previously described pump (solid curve 120). For comparison, the diagram also includes a corresponding curve 117 for a double pump according to the prior art (dashed curve). In the area of high delivery heights, ie in the diagram in the left area, the curves overlap, ie the pumps operate with equal effect. Only from a point 115, the pump curve 117 drops significantly for the double pump according to the prior art. This results from the fact that with increasing pressure drop with increasing flow rate, the pressure-related closing force acting on the flap decreases, so that then closes beyond the point 115 increasing flow rates and further decreasing pressure, the flap no longer tight and part of the flow through the pump off flowing back. The double pump or non-return valve according to the invention, however, ensures, as the curve 120 shows, that the shape of the pump curve avoids this steep drop and compared to the pump curve 117, especially in the range of large flow rates and small heads, a higher flow rate, since the check valve also closes tight in this area and thus no or at least lower short-circuit currents occur.

Das vorstehend anhand der Doppelpumpe 5 und der Rückschlagklappe 35 erläuterte Prinzip kann grundsätzlich auch an beliebigen anderen Leitungsverzweigungen eingesetzt werden, wenn die im Mündungsbereich der Leitungen eingesetzte Klappe entsprechend ausgebildet wird.The principle explained above with reference to the double pump 5 and the non-return valve 35 can in principle also be used on any other branch lines if the flap used in the mouth region of the lines is designed accordingly.

Die vorstehend beschriebene Klappenausbildung stellt jedoch nur eine von einer Vielzahl möglicher Ausbildungen dar, je nach Größe und Winkel der Anströmfläche kann die dadurch erzeugte zusätzliche Schließkraft den Erfordernissen entsprechend angepasst werden.However, the above-described flap training is only one of a variety of possible configurations, depending on the size and angle of the inflow, the additional closing force generated thereby can be adjusted according to requirements.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

55
Doppelpumpedouble pump
77
gemeinsame Eingangsleitungcommon input line
88th
Gehäusecasing
1010
Pumpepump
1515
Pumpepump
1616
LaufradWheel
1717
LaufradWheel
1818
Schneckengehäusesnail shell
1919
Schneckengehäusesnail shell
2020
druckseitige Leitungpressure-side line
2525
druckseitige Leitungpressure-side line
2727
Mündungsbereichmouth area
3030
gemeinsame Ausgangsleitungcommon output line
3535
Rückschlagklappecheck valve
4040
Achseaxis
4545
Klappenseiteflap side
5050
Klappenseiteflap side
5555
Anlageflächecontact surface
6060
Anlageflächecontact surface
6565
Dichtflächesealing surface
7070
Dichtflächesealing surface
7575
Strömungspfadflow path
8080
Anströmflächeinflow area
8585
Anströmflächeinflow area
8888
HauptströmungsrichtungMain flow direction
9090
Spoilerspoiler
9595
Spoilerspoiler
100100
Stützesupport
HH
Förderhöhehead
QQ
Förderstromflow
115115
Kurvenpunktcurve point
117117
Pumpenkurve einer Doppelpumpe nach dem Stand der TechnikPump curve of a double pump according to the prior art
120120
Pumpenkurve der Doppelpumpe 5Pump curve of the double pump 5

Claims (10)

Doppelpumpe (5) mit zwei Pumpen (10, 15), deren druckseitige Leitungen (20, 25) in einer gemeinsamen Ausgangsleitung (30) münden, mit einer im Mündungsbereich (27) angeordneten strömungsgesteuerten Rückschlagklappe (35), die bei Durchströmung einer druckseitigen Leitung (20) die andere druckseitige Leitung (25) verschließt, dadurch gekennzeichnet, dass die Rückschlagklappe (35) mindestens eine in Schließstellung in den Strömungspfad (75) ragende Anströmfläche (80, 85) aufweist, welche stromaufwärts gewandt ist.Double pump (5) with two pumps (10, 15), the pressure-side lines (20, 25) in a common output line (30) open, with a in the mouth region (27) arranged flow-controlled non-return valve (35), which flows through a pressure-side line (20) the other pressure-side line (25) closes, characterized in that the non-return flap (35) at least one in the closed position in the flow path (75) projecting inflow surface (80, 85) which faces upstream. Doppelpumpe (5) nach Anspruch 1, dadurch gekennzeichnet, dass die Anströmfläche (80, 85) durch einen an der Rückschlagklappe (35) angeordneten Spoiler (90, 95) gebildet ist.Double pump (5) according to claim 1, characterized in that the inflow surface (80, 85) by a on the non-return valve (35) arranged spoiler (90, 95) is formed. Doppelpumpe (5) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Rückschlagklappe (35) an ihren beiden voneinander abgewandten Flachseiten (45, 50) jeweils eine Anströmfläche (80, 85) aufweist.Double pump (5) according to claim 1 or 2, characterized in that the non-return flap (35) at its two mutually remote flat sides (45, 50) each have an inflow surface (80, 85). Doppelpumpe (5) nach Anspruch 3, dadurch gekennzeichnet, dass die Anströmflächen (80, 85) jeweils von einer Dichtfläche (65, 70) umgeben sind.Double pump (5) according to claim 3, characterized in that the inflow surfaces (80, 85) are each surrounded by a sealing surface (65, 70). Doppelpumpe (5) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Anströmfläche (35) einachsig gekrümmt ist, wobei die Krümmungsachse parallel zur Schwenkachse (40) der Rückschlagklappe (35) angeordnet und die gekrümmte Anströmfläche (80, 85) zum Strömungspfad (75) hin konkav angeordnet ist.Double pump (5) according to one of claims 1 to 4, characterized in that the inflow surface (35) is uniaxially curved, wherein the axis of curvature parallel to the pivot axis (40). arranged the check valve (35) and the curved inflow surface (80, 85) is arranged concavely to the flow path (75). Rückschlagklappe (35) für eine Leitungsverzweigung, dadurch gekennzeichnet, dass sie mindestens eine Anströmfläche (80, 85) aufweist, welche schräg zur Längsmittelebene der Rückschlagklappe (35) orientiert ist und fern der Schwenkachse (40) der Rückschlagklappe von der Längsmittelebene weiter beabstandet ist als nahe der Schwenkachse (40).Non-return flap (35) for a branch line, characterized in that it comprises at least one inflow surface (80, 85) which is oriented obliquely to the longitudinal center plane of the non-return flap (35) and far away from the pivot axis (40) of the non-return flap from the longitudinal center plane than near the pivot axis (40). Rückschlagklappe (35) nach Anspruch 6, dadurch gekennzeichnet, dass die Anströmfläche (80, 85) durch einen an der Rückschlagklappe (35) angeordneten Spoiler (90, 95) gebildet ist.Non-return flap (35) according to claim 6, characterized in that the inflow surface (80, 85) by a on the non-return valve (35) arranged spoiler (90, 95) is formed. Rückschlagklappe (35) nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass sie an ihren beiden voneinander abgewandten Flachseiten (45, 50) jeweils eine Anströmfläche aufweist.Non-return valve (35) according to claim 6 or 7, characterized in that it has at its two mutually remote flat sides (45, 50) each have an inflow surface. Rückschlagklappe (35) nach einem Anspruch 8, dadurch gekennzeichnet, dass die Anströmflächen (80, 85) jeweils von einer Dichtfläche (65, 70) umgeben sind.Non-return valve (35) according to claim 8, characterized in that the inflow surfaces (80, 85) are each surrounded by a sealing surface (65, 70). Rückschlagklappe nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, dass die Anströmfläche (80, 85) einachsig gekrümmt ist, wobei die Krümmungsachse parallel zur Schwenkachse (40) der Rückschlagklappe (35) angeordnet und die gekrümmte Anströmfläche (80, 85) zum Strömungspfad (75) hin konkav angeordnet ist.Non-return valve according to one of claims 6 to 9, characterized in that the inflow surface (80, 85) is curved uniaxially, wherein the axis of curvature parallel to the pivot axis (40) of the check valve (35) arranged and the curved inflow surface (80, 85) to the flow path (75) is concave.
EP08015575.7A 2008-09-04 2008-09-04 Double pump Active EP2161455B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2469094A2 (en) 2010-12-23 2012-06-27 Wilo Se Method for operating a double pump or multi pump assembly
DE102014006258A1 (en) * 2014-04-30 2015-11-05 Wilo Se Method for controlling a pump system and regulated pump system
EP3179110A1 (en) * 2015-12-10 2017-06-14 Wilo Se Double pump
EP4102076A1 (en) 2021-06-07 2022-12-14 Ebara Corporation Pump casing
EP4102078A2 (en) 2021-06-07 2022-12-14 Ebara Corporation Discharge merging portion, pump casing, and pump apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017033A (en) 1935-02-09 1935-10-08 Charlie L Mcguffin Manifold valve for slush pumps
DE1528649A1 (en) * 1966-07-21 1969-05-29 Flygts Pumpar Ab Pump unit, consisting of two centrifugal pumps
DE4330507C1 (en) * 1993-09-09 1994-10-06 Grundfos As Flap switchover device for the discharge side of a twin pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1142593A (en) * 1956-02-08 1957-09-19 Guinard Pompes Improvement in centrifugal pumps with two directions of rotation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2017033A (en) 1935-02-09 1935-10-08 Charlie L Mcguffin Manifold valve for slush pumps
DE1528649A1 (en) * 1966-07-21 1969-05-29 Flygts Pumpar Ab Pump unit, consisting of two centrifugal pumps
DE4330507C1 (en) * 1993-09-09 1994-10-06 Grundfos As Flap switchover device for the discharge side of a twin pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2469094A2 (en) 2010-12-23 2012-06-27 Wilo Se Method for operating a double pump or multi pump assembly
DE102010055841A1 (en) 2010-12-23 2012-06-28 Wilo Se Method for operating a double pump or multi-pump unit
DE102014006258A1 (en) * 2014-04-30 2015-11-05 Wilo Se Method for controlling a pump system and regulated pump system
EP3179110A1 (en) * 2015-12-10 2017-06-14 Wilo Se Double pump
EP4102076A1 (en) 2021-06-07 2022-12-14 Ebara Corporation Pump casing
EP4102078A2 (en) 2021-06-07 2022-12-14 Ebara Corporation Discharge merging portion, pump casing, and pump apparatus

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