EP1293678B1 - Pump impeller with valve function - Google Patents
Pump impeller with valve function Download PDFInfo
- Publication number
- EP1293678B1 EP1293678B1 EP20020013218 EP02013218A EP1293678B1 EP 1293678 B1 EP1293678 B1 EP 1293678B1 EP 20020013218 EP20020013218 EP 20020013218 EP 02013218 A EP02013218 A EP 02013218A EP 1293678 B1 EP1293678 B1 EP 1293678B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- impeller
- pump
- accordance
- valve
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/165—Sealings between pressure and suction sides especially adapted for liquid pumps
- F04D29/167—Sealings between pressure and suction sides especially adapted for liquid pumps of a centrifugal flow wheel
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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
- F04D15/0027—Varying behaviour or the very pump
- F04D15/0038—Varying behaviour or the very pump by varying the effective cross-sectional area of flow through the rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/042—Axially shiftable rotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/14—Shaft sealings operative only when pump is inoperative
- F04D29/146—Shaft sealings operative only when pump is inoperative especially adapted for liquid pumps
Definitions
- the present invention relates to a centrifugal pump having the features of the preamble of claim 1.
- a centrifugal pump having the features of the preamble of claim 1.
- Such a pump is for example from each of the DE-A-2510787 .
- Centrifugal pumps with a driven by an electric motor via a shaft impeller are well known.
- the problem is also known that in such centrifugal pumps at standstill, a certain leakage current can flow through the impeller.
- Centrifugal pumps can therefore, unlike, for example, gear pumps, not realize a valve function within cable networks.
- To shut off the line in the vicinity of a centrifugal pump requires additional and costly valves.
- the disadvantage of the leakage current does not weigh very heavily, since this only occurs with pressure differences, moreover it is relatively small and therefore only one has little influence on the overall system.
- the leakage current in the case of "decentralized" in the heating circuit of a building arranged pumps, which are arranged in the vicinity of a radiator and supply only this or sometimes even the adjacent located in the same room radiator with medium.
- the leakage flow is supported by the natural convection, which alone, as known from a central heating, can cause a distribution of hot water heating even without the use of a pump.
- the convection therefore pushes the hot water through the impeller of the decentralized heating pump without it being able to stop the flow.
- the leakage causes an unwanted heating of the radiator and thus a reduction in living comfort and, above all, an unnecessary loss of energy.
- Such leakage can also be caused by the fact that a pump operating in the system flows over another pump switched off. Such a leakage flow can take place not only in the pumping direction but also against the pumping direction.
- Object of the present invention is to provide a cost-effective to implement centrifugal pump of the type mentioned, which offers a simple way to shut off a leakage occurring through the impeller with a compact design and good hydraulic properties.
- the basic idea of the invention is to be seen in the fact that one of the openings of the impeller is blocked with a cover arranged in the pump housing and thus a leakage current is stopped.
- either one of the openings can be closed immediately, or the current is blocked in the immediate vicinity of the impeller within the impeller chamber.
- the pump thus acts as a valve which locks in both directions, whereby it is also possible by appropriate design measures to effect a blockage in only one direction in the manner of a check valve.
- either the inlet opening and / or the outlet openings of the impeller may be indirectly or directly closable with the valve member.
- cylindrical wheels with their radially arranged outlet openings, frusto-conical wheels with correspondingly angular outlet openings and also propellers can be sealed. In any case, the leakage flow is effectively interrupted in a simple manner.
- valve member and / or the valve seat does not form a separate actuator within the pump housing but is integrated into its inner wall.
- the impeller is displaceable in the axial direction and the valve member closes one of the openings after the displacement or blocks the flow. So it is possible to reduce the number of components and to achieve high reliability with a compact design of the pump.
- a part of the inner wall may also be formed by a hydraulic insert which on the one hand forms the inlet opening and on the other hand surrounds the end wall of the pump housing surrounding the suction mouth.
- a structurally particularly simple and thus advantageous solution is to provide the inner wall of the pump housing with a cylindrical receptacle into which the impeller is inserted and the impeller provides a stop with its edge. Against this stop, which is acted upon by a arranged behind the wings cylindrical edge of the impeller, a seal takes place in the axial direction. The promotional part of the impeller is thereby deactivated in some way.
- Such axial sealing which indirectly closes the radial openings, is advantageous in contrast to an equally possible radial direct sealing, since the movement of the impeller is not hindered. The impeller simply lifts off the sealing surface in its disengaged position and is free to rotate.
- the impeller has the function of a valve member, in particular a valve cone, which is pressed against a valve seat formed by the pump housing.
- the seat and the valve member need not necessarily have a radially arranged sealing surface, and other arrangements of sealing surfaces, such as conical, are conceivable. It is also possible to provide sealing profiles between the sealing surfaces.
- the impeller and / or serving as a sealing surface stop can be made of a sealing plastic.
- the impeller can engage with an axial displacement in the front side of the impeller arranged receptacle.
- the displacement of the impeller can be done in different ways.
- the impeller can be moved by means of electrical, magnetic, mechanical or thermal forces.
- the valve function can be controlled by changing the direction of rotation. With “correct” so promoting direction of rotation of the impeller, the impeller would be brought into the disengaged and "wrong" direction of rotation in the engaged position.
- the motor force would push the impeller into the valve seat by utilizing its inertia in that the shaft is accelerated so much that the impeller can not follow.
- the valve is advantageously locked to secure the position.
- a thread on the shaft to the realization of the displacement could be designed to be self-locking slope in the range of the end position.
- the impeller automatically engages in the receptacle upon suspension of the rotation, ie without manipulation by an operator.
- Such automatic engagement can be realized in the case of short-term reverse run by the execution of a program in the engine control. However, it can also be effected simply by the force of a relaxing spring, which is acted upon by the pump running by a magnetic force or by a hydraulically generated mechanical force. Such a magnetic force could be generated, for example, by the current-carrying windings of the electric motor. Once the engine stops, the field collapses and the spring could relax.
- FIG. 1 shows a special design of a centrifugal pump.
- This is a pump that is arranged decentrally, ie in the immediate vicinity of a radiator.
- the special design allows it, that the pump can be screwed by means of a thread 1 in the connecting flange of a thermostatic valve.
- a thread 1 in the connecting flange of a thermostatic valve.
- the seal between the pump and the connecting piece is done by means of a groove 7 held in an O-ring.
- the pump itself has on its electrical side a driving electric motor 4 and on the hydraulic side held on the shaft 5 impeller 6, which has a central suction port 20 as an inlet opening.
- the impeller 6 is surrounded by a pump or impeller housing 8, which in this case has a pear shape and is designed as an adapter for connection to the connecting piece of the thermostatic valve.
- the adapter 8 is connected via a bayonet closure 9 with the motor 4 and sealed by means of an O-ring 10.
- a hydraulic insert 11 is arranged, which forms the outlet 3 with its hydrodynamically shaped surface and determines the geometry of the impeller chamber.
- guide structures 17 are arranged, which hold the hydraulic insert 11 and brake the swirl of the outflowing water.
- the impeller 6 is slidably mounted (double arrow A) on the shaft 5 and can be engaged in a cylindrical receptacle 12 formed by the hydraulic insert 11.
- the engaged state is shown in FIG. It can be clearly seen that the flow through the impeller 6 disengaged Condition (Figure 1) is not impeded.
- the centrifugal pump operates in this state in a known manner. Now runs the engine briefly backwards, so the impeller 6 moves into the receptacle 12 such that the cylindrical rim 13 of the impeller comes to rest on the sealing surface 18 of the hydraulic insert 11. Thus, the outlet openings 14 are closed and sealed any leakage.
- the displacement of the impeller 6 on the shaft 5 is done in this embodiment, characterized in that the impeller 6 rotatably mounted by means of an internal thread on a located on the shaft head external thread 15 ( Figure 3).
- the impeller 6 When promoting forward rotation, it advances from the seat due to its inertia in a helical motion, and correspondingly upon a brief reverse rotation (double arrow A).
- the impeller When engaged, the impeller is locked.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die vorliegende Erfindung betrifft eine Kreiselpumpe mit den Merkmalen des Oberbegriffes des Anspruchs 1. Eine solche Pumpe ist z.B. aus jeder einzelnen der
Kreiselpumpen mit einem von einem Elektromotor über eine Welle angetriebenen Laufrad sind hinlänglich bekannt. Dabei ist auch das Problem bekannt, daß bei solchen Kreiselpumpen im Stillstand ein gewisser Leckstrom durch das Laufrad fließen kann. Kreiselpumpen können daher im Gegensatz beispielsweise zu Zahnradpumpen keine Ventilfunktion innerhalb von Leitungsnetzen realisieren. Um die Leitung in der Umgebung einer Kreiselpumpe abzusperren bedarf es zusätzlicher und kostenaufwendiger Ventile. Im Normalfall wiegt der Nachteil des Leckstromes jedoch nicht sonderlich schwer, da dieser nur bei Druckunterschieden auftritt, zudem verhältnismäßig klein ist und daher nur einen geringen Einfluß auf das Gesamtsystem hat. Besonders nachteilig wirkt sich der Leckstrom jedoch im Falle "dezentral" im Heizkreislauf eines Gebäudes angeordneter Pumpen aus, die in der Nähe eines Heizkörpers angeordnet sind und nur diesen oder mitunter noch den benachbarten in demselben Raum befindlichen Heizkörper mit Medium versorgen.Centrifugal pumps with a driven by an electric motor via a shaft impeller are well known. In this case, the problem is also known that in such centrifugal pumps at standstill, a certain leakage current can flow through the impeller. Centrifugal pumps can therefore, unlike, for example, gear pumps, not realize a valve function within cable networks. To shut off the line in the vicinity of a centrifugal pump requires additional and costly valves. In the normal case, however, the disadvantage of the leakage current does not weigh very heavily, since this only occurs with pressure differences, moreover it is relatively small and therefore only one has little influence on the overall system. Particularly disadvantageous, however, the leakage current in the case of "decentralized" in the heating circuit of a building arranged pumps, which are arranged in the vicinity of a radiator and supply only this or sometimes even the adjacent located in the same room radiator with medium.
Insbesondere bei dieser Art von Pumpen wird der Leckfluß durch die natürliche Konvektion unterstützt, die allein, wie von einer Zentralheizung bekannt, eine Verteilung von heißem Heizungswasser auch ohne den Einsatz einer Pumpe bewirken kann. Die Konvektion drückt daher das heiße Wasser durch das Laufrad der dezentralen Heizungspumpe, ohne daß diese den Fluß stoppen könnte. Im Falle derartiger Heizungssysteme bewirkt der Leckfluß ein ungewolltes Aufheizen des Heizkörpers und damit eine Minderung des Wohnkomforts und vor allem einen unnötigen Energieverlust. Ein solcher Leckfluß kann außerdem auch dadurch hervorgerufen sein, daß eine im System arbeitende Pumpe eine andere abgeschaltete Pumpe überströmt. Ein solcher Leckfluß kann dabei nicht nur in Pumprichtung sondern auch gegen die Pumprichtung erfolgen.In particular, in this type of pump, the leakage flow is supported by the natural convection, which alone, as known from a central heating, can cause a distribution of hot water heating even without the use of a pump. The convection therefore pushes the hot water through the impeller of the decentralized heating pump without it being able to stop the flow. In the case of such heating systems, the leakage causes an unwanted heating of the radiator and thus a reduction in living comfort and, above all, an unnecessary loss of energy. Such leakage can also be caused by the fact that a pump operating in the system flows over another pump switched off. Such a leakage flow can take place not only in the pumping direction but also against the pumping direction.
Aus der
Aufgabe der vorliegenden Erfindung ist es, eine kostengünstig zu realisierende Kreiselpumpe der genannten Art zu schaffen, die bei kompakter Konstruktion und guten hydraulischen Eigenschaften eine einfache Möglichkeit zur Absperrung eines durch das Laufrad auftretenden Leckflusses bietet.Object of the present invention is to provide a cost-effective to implement centrifugal pump of the type mentioned, which offers a simple way to shut off a leakage occurring through the impeller with a compact design and good hydraulic properties.
Diese Aufgabe wird durch eine Kreiselpumpe nach Anspruch 1 gelöst.This object is achieved by a centrifugal pump according to claim 1.
Der grundlegende Gedanke der Erfindung ist darin zu sehen, daß eine der Öffnungen des Laufrades mit einer im Pumpengehäuse angeordneten Abdeckung blockiert und damit ein Leckstrom gestoppt wird. Dazu kann entweder eine der Öffnungen unmittelbar verschlossen werden, oder der Strom wird in unmittelbarer Nähe des Laufrades innerhalb der Laufradkammer blockiert. Die Pumpe wirkt damit als Ventil, das in beide Richtungen sperrt, wobei es durch geeignete konstruktive Maßnahmen auch möglich ist, eine Sperrung in nur eine Richtung in der Art eines Rückschlagventiles zu bewirken. Zur Abdichtung des Leckflusses kann dabei entweder die Eintrittsöffnung und/oder die Austrittsöffnungen des Laufrades mit dem Ventilglied mittelbar oder unmittelbar verschließbar sein. So können zylindrische Laufräder mit ihren radial angeordneten Austrittsöffnungen, kegelstumpfförmige Laufräder mit entsprechend im Winkel angeordneten Austrittsöffnungen und auch Propeller abgedichtet werden. Auf jeden Fall wird der Leckfluß auf einfache Weise effektiv unterbrochen.The basic idea of the invention is to be seen in the fact that one of the openings of the impeller is blocked with a cover arranged in the pump housing and thus a leakage current is stopped. For this purpose, either one of the openings can be closed immediately, or the current is blocked in the immediate vicinity of the impeller within the impeller chamber. The pump thus acts as a valve which locks in both directions, whereby it is also possible by appropriate design measures to effect a blockage in only one direction in the manner of a check valve. In order to seal the leakage flow, either the inlet opening and / or the outlet openings of the impeller may be indirectly or directly closable with the valve member. Thus, cylindrical wheels with their radially arranged outlet openings, frusto-conical wheels with correspondingly angular outlet openings and also propellers can be sealed. In any case, the leakage flow is effectively interrupted in a simple manner.
Auf jedem Fall ist es wegen der konstruktiv einfachen Umsetzung zu bevorzugen, wenn das Ventilglied und/oder der Ventilsitz kein separates Stellorgan innerhalb des Pumpengehäuses ausbildet sondern in dessen Innenwandung integriert ist. Um die Ventilfunktion mit Laufrad und Pumpengehäuse zu realisieren, ist es vorteilhaft, wenn das Laufrad in axialer Richtung verschieblich ist und das Ventilglied eine der Öffnungen nach der Verschiebung verschließt respektive den Fluß blockiert. So ist es möglich die Zahl der Bauteile zu reduzieren und eine hohe Zuverlässigkeit bei kompakter Bauweise der Pumpe zu erreichen. Dabei kann ein Teil der Innenwandung auch von einem Hydraulikeinsatz gebildet sein, der einerseits die Einlaßöffnung und andererseits die den Saugmund umgebende Stirnwand des Pumpengehäuses bildet.In any case, it is preferable because of the structurally simple implementation, when the valve member and / or the valve seat does not form a separate actuator within the pump housing but is integrated into its inner wall. In order to realize the valve function with impeller and pump housing, it is advantageous if the impeller is displaceable in the axial direction and the valve member closes one of the openings after the displacement or blocks the flow. So it is possible to reduce the number of components and to achieve high reliability with a compact design of the pump. In this case, a part of the inner wall may also be formed by a hydraulic insert which on the one hand forms the inlet opening and on the other hand surrounds the end wall of the pump housing surrounding the suction mouth.
Eine konstruktiv besonders einfache und damit vorteilhafte Lösung liegt darin, die Innenwandung des Pumpengehäuses mit einer zylindrischen Aufnahme zu versehen, in die das Laufrad einschiebbar ist und die mit ihrem Rand dem Laufrad einen Anschlag bietet. Gegen diesen Anschlag, der von einem hinter den Flügeln angeordnetem zylindrischen Rand des Laufrades beaufschlagt wird, findet eine Abdichtung in axialer Richtung statt. Der fördernde Teil des Laufrades wird dadurch in gewisser Weise deaktviert. Eine solche axiale Abdichtung, welche die radialen Öffnungen indirekt verschließt, ist im Gegensatz zu einer ebenfalls möglichen radialen unmittelbaren Abdichtung von Vorteil, da die Bewegung des Laufrades nicht behindert wird. Das Laufrad hebt in seiner ausgerückten Stellung einfach von der Dichtfläche ab und kann frei rotieren.A structurally particularly simple and thus advantageous solution is to provide the inner wall of the pump housing with a cylindrical receptacle into which the impeller is inserted and the impeller provides a stop with its edge. Against this stop, which is acted upon by a arranged behind the wings cylindrical edge of the impeller, a seal takes place in the axial direction. The promotional part of the impeller is thereby deactivated in some way. Such axial sealing, which indirectly closes the radial openings, is advantageous in contrast to an equally possible radial direct sealing, since the movement of the impeller is not hindered. The impeller simply lifts off the sealing surface in its disengaged position and is free to rotate.
In diesem Fall hat das Laufrad die Funktion eines Ventilgliedes, insbesondere eines Ventilkegels, der gegen einen vom Pumpengehäuse gebildeten Ventilsitz gedrückt wird. Dabei muß müssen der Sitz und das Ventilglied nicht unbedingt eine radial angeordnete Dichtfläche aufweisen, auch andere Anordnungen von Dichtflächen, z.B. kegelförmige, sind denkbar. Es ist auch möglich, zwischen den Dichtflächen Dichtprofile vorzusehen. Das Laufrad und/oder der als Dichtfläche dienende Anschlag können aus einem dichtendem Kunststoff gefertigt sein.In this case, the impeller has the function of a valve member, in particular a valve cone, which is pressed against a valve seat formed by the pump housing. In this case, the seat and the valve member need not necessarily have a radially arranged sealing surface, and other arrangements of sealing surfaces, such as conical, are conceivable. It is also possible to provide sealing profiles between the sealing surfaces. The impeller and / or serving as a sealing surface stop can be made of a sealing plastic.
Gerade beim Einsatz einer solchen dichtenden zylindrischen Aufnahme kann das verschieblich auf der Welle angeordnete Laufrad mit einer axialen Verschiebung in die stirnseitig vom Laufrad angeordnete Aufnahme einrücken. Die Verschiebung des Laufrades kann auf unterschiedliche Weise geschehen. So kann das Laufrad mittels elektrischer, magnetischer, mechanischer oder auch thermischer Kräfte verschoben werden. Besonders vorteilhaft ist es jedoch, wenn die Ventilfunktion durch Änderung der Drehrichtung gesteuert werden kann. Bei "richtiger" also fördernder Drehrichtung des Laufrades würde das Laufrad in die ausgerückte und bei "falscher" Drehrichtung in die eingerückte Position gebracht werden. Die Motorkraft würde das Laufrad insofern unter Ausnutzung von dessen Trägheit in den Ventilsitz drücken, als die Welle so stark beschleunigt wird, daß das Laufrad nicht folgen kann. In der geschlossenen Position wird das Ventil vorteilhafterweise verriegelt, um die Position zu sichern. Beim Einsatz eines Gewindes auf der Welle zur Realisierung der Verschiebung könnte dazu die Steigung im Bereich der Endstellung selbsthemmend gestaltet werden.Especially when using such a sealing cylindrical receiving the displaceable arranged on the shaft impeller can engage with an axial displacement in the front side of the impeller arranged receptacle. The displacement of the impeller can be done in different ways. Thus, the impeller can be moved by means of electrical, magnetic, mechanical or thermal forces. However, it is particularly advantageous if the valve function can be controlled by changing the direction of rotation. With "correct" so promoting direction of rotation of the impeller, the impeller would be brought into the disengaged and "wrong" direction of rotation in the engaged position. The motor force would push the impeller into the valve seat by utilizing its inertia in that the shaft is accelerated so much that the impeller can not follow. In the closed position, the valve is advantageously locked to secure the position. When using a thread on the shaft to the realization of the displacement could be designed to be self-locking slope in the range of the end position.
Ob das Einrücken des Laufrades durch einen kurzzeitigen Rückwärtslauf oder auf andere Art bewirkt wird, so ist es auf jeden Fall zu bevorzugen, wenn das Laufrad bei einem Aussetzen der Drehung selbsttätig, also ohne Handhabung durch eine Bedienperson, in die Aufnahme einrückt. Ein solches selbsttätiges Einrücken kann im Falle des kurzzeitigen Rückwärtslaufes durch den Ablauf eines Programmes in der Motorsteuerung realisiert sein. Es kann jedoch auch einfach durch die Kraft einer sich entspannenden Feder bewirkt werden, die bei laufender Pumpe durch eine magnetische Kraft oder durch eine hydraulisch erzeugte mechanische Kraft beaufschlagt wird. Eine solche magnetische Kraft könnte beispielsweise durch die stromdurchflossenen Wicklungen des Elektromotors erzeugt sein. Sobald der Motor aussetzt, bricht das Feld zusammen und die Feder könnte sich entspannen.Whether the engagement of the impeller is effected by a brief reverse or otherwise, it is in any case preferable if the impeller automatically engages in the receptacle upon suspension of the rotation, ie without manipulation by an operator. Such automatic engagement can be realized in the case of short-term reverse run by the execution of a program in the engine control. However, it can also be effected simply by the force of a relaxing spring, which is acted upon by the pump running by a magnetic force or by a hydraulically generated mechanical force. Such a magnetic force could be generated, for example, by the current-carrying windings of the electric motor. Once the engine stops, the field collapses and the spring could relax.
Eine besondere Ausführungsform der erfindungsgemäßen Pumpe wird nachfolgend anhand der Figuren 1 bis 3 näher beschrieben. Es zeigen:
- Figur 1
- eine "offene" Pumpe,
-
Figur 2 - eine "geschlossene" Pumpe und
-
Figur 3 - ein eingerücktes Laufrad im Detail.
- FIG. 1
- an "open" pump,
- FIG. 2
- a "closed" pump and
- FIG. 3
- an indented wheel in detail.
In Figur 1 ist eine besondere Bauform einer Kreiselpumpe gezeigt. Dabei handelt es sich um eine Pumpe, die dezentral, also in unmittelbarer Nähe eines Heizkörpers, angeordnet wird. Die besondere Bauform läßt es zu, daß die Pumpe vermittels eines Gewindes 1 in den Anschlußflansch eines Thermostatventils eingeschraubt werden kann. Um den hydraulischen Gegebenheiten in einem solchen Anschlußflansch zu genügen, sind nicht nur der Einlaß mit seiner Zulaufleitung 2, sondern auch der Auslaß 3 in axialer Richtung angelegt. Die Abdichtung zwischen der Pumpe und dem Anschlußstutzen geschieht vermittels eines in einer Nut 7 gehaltenen O-Ringes.FIG. 1 shows a special design of a centrifugal pump. This is a pump that is arranged decentrally, ie in the immediate vicinity of a radiator. The special design allows it, that the pump can be screwed by means of a thread 1 in the connecting flange of a thermostatic valve. To meet the hydraulic conditions in such a flange, not only the inlet with its
Die Pumpe selber weist auf ihrer elektrischen Seite einen antreibenden Elektromotor 4 und auf der hydraulischen Seite ein auf der Welle 5 gehaltenes Laufrad 6 auf, das einen zentralen Saugmund 20 als Eintrittsöffnung hat. Das Laufrad 6 ist umgeben von einem Pumpen- oder Laufradgehäuse 8, das in diesem Fall eine Birnenform aufweist und als Adapter für den Anschluß an den Anschlußstutzen des Thermostatventils ausgebildet ist. Der Adapter 8 ist über einen Bajonettverschluß 9 mit dem Motor 4 verbunden und vermittels eines O-Ringes 10 abgedichtet. In der Laufradkammer 19 ist ein Hydraulikeinsatz 11 angeordnet, der mit seiner hydrodynamisch gestalteten Oberfläche den Auslaß 3 formt und die Geometrie der Laufradkammer festlegt. Zwischen Hydraulikeinsatz 11 und der Innenwandung des Laufradgehäuses 8 sind Leitstrukturen 17 angeordnet, die den Hydraulikeinsatz 11 halten und den Drall des ausströmenden Wassers bremsen.The pump itself has on its electrical side a driving
Erfindungsgemäß ist das Laufrad 6 verschieblich (Doppelpfeil A) auf der Welle 5 gelagert und kann in eine von dem Hydraulikeinsatz 11 gebildete zylindrische Aufnahme 12 eingerückt werden. Der eingerückte Zustand ist in Figur 2 gezeigt. Deutlich zu erkennen ist, daß der Durchfluß durch das Laufrad 6 im ausgerückten Zustand (Figur 1) nicht behindert ist. Die Kreiselpumpe arbeitet in diesem Zustand in bekannter Weise. Läuft nun der Motor kurzzeitig rückwärts, so rückt das Laufrad 6 in die Aufnahme 12 derart ein, daß der zylindrische Rand 13 des Laufrades auf der Dichtfläche 18 des Hydraulikeinsatzes 11 zu liegen kommt. Somit werden die Austrittsöffnungen 14 verschlossen und ein jeglicher Leckfluß abgedichtet.According to the invention, the
Das Verschieben des Laufrades 6 auf der Welle 5 geschieht in diesem Ausführungsbeispiel dadurch, daß das Laufrad 6 vermittels eines Innengewindes auf einem auf dem Wellenkopf befindlichen Außengewinde 15 drehbeweglich aufsitzt (Figur 3). Bei fördernder Vorwärtsdrehung rückt es wegen seiner Trägheit in einer Schraubenbewegung aus der Aufnahme aus und entsprechend bei einer kurzzeitigen Rückwärtsdrehung ein (Doppelpfeil A). Im eingerückten Zustand wird das Laufrad verriegelt.The displacement of the
Claims (10)
- Rotary pump with an impeller (6), which is held on a shaft (5) and which has a central suction opening (20) as an intake port, whereby the medium entering via the suction opening leaves the impeller (6) by means of at least one outlet (3), whereby the impeller (6) is surrounded by a pump housing (8) forming the impeller chamber, and whereby a leakage flow arising, when the impeller (6) is stationery, by means of a valve (13, 18) disposed within the pump housing (8), can be stopped by the capacity of the impeller (6) to shift in an axial direction, characterized in that the impeller (6) can be shifted, axially, further onto or towards the end of its shaft (5).
- Pump in accordance with claim 1, characterized in that
the intake port (20) and/or the outlets (14) of the impeller (6) can be stopped by means of the valve in order to close off the leakage flow. - Pump in accordance with claims 1 or 2, characterized in that
an inner surface of the pump housing (8) forms a valve element or a valve seat. - Pump in accordance with one of the preceding claims, characterized in that the inner surface has a cylindrical uptake means (12) into which the impeller (6) is inserted in an axial movement, whereby the impeller (6), as valve element, lies, with one rim, directly or indirectly on a sealing surface (18) formed by the uptake means (12).
- Pump in accordance with one of the preceding claims, characterized in that the impeller (6) automatically inserts itself in the uptake means (12) when rotation stops.
- Pump in accordance with one of the preceding claims, characterized in that the impeller (6) sits with an inner thread, and able to rotate, on an outer thread (15) on the shaft head, and shifts, in a helical movement, at the time of a drawing forward movement, out of the uptake means (12).
- Pump in accordance with one of the preceding claims, characterized in that
the impeller (6) is inserted into the uptake means (12) when there is a brief backward movement. - Pump in accordance with one of the preceding claims, characterized in that the axial displacement of the impeller (6) is enabled by magnetic forces, whereby the magnetic fields are particularly produced by the windings, of the electromotor (4), through which electrical current flows.
- Pump in accordance with one of the preceding claims, characterized in that the impeller (6) can be locked in the engaged state.
- Pump in accordance with one of the preceding claims, characterized in that a closing means, particularly an inner thread, located on the hydraulic side, can be applied to a valve housing having a feed conduit and an outflow conduit, the said inner thread surrounding the suction opening of the feed conduit, and the impeller takes on the function of the valve element sealing the feed conduit.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10145411 | 2001-09-14 | ||
| DE2001145411 DE10145411A1 (en) | 2001-09-14 | 2001-09-14 | Impeller with valve function |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1293678A2 EP1293678A2 (en) | 2003-03-19 |
| EP1293678A3 EP1293678A3 (en) | 2004-01-07 |
| EP1293678B1 true EP1293678B1 (en) | 2007-10-10 |
Family
ID=7699078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20020013218 Expired - Lifetime EP1293678B1 (en) | 2001-09-14 | 2002-06-15 | Pump impeller with valve function |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1293678B1 (en) |
| DE (2) | DE10145411A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009011946A1 (en) * | 2009-03-10 | 2010-09-16 | Wilo Se | Electric motor for actuating a valve |
| EP4390137A1 (en) * | 2022-12-20 | 2024-06-26 | Wilo Se | Method for releasing a blockage of a waste water pump |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2870898B1 (en) * | 2004-05-28 | 2008-09-12 | Mark Iv Systemes Moteurs Sa | VARIABLE FLOW PUMP DEVICE |
| PL1767788T3 (en) * | 2005-09-23 | 2009-01-30 | Bsh Hausgeraete Gmbh | Drain pump for home appliances |
| DE102006027319B4 (en) * | 2006-06-13 | 2014-05-22 | Wilo Ag | Centrifugal motor pump with rotation-directed start |
| DE102007052082A1 (en) * | 2007-10-31 | 2009-05-07 | BSH Bosch und Siemens Hausgeräte GmbH | Water-conducting household appliance with a pump with valve function |
| DE102010062752A1 (en) * | 2010-12-09 | 2012-06-14 | Mahle International Gmbh | Cooling agent pump for internal combustion engine, has impeller that is displaceably mounted along axial direction for controlling ejection rate of pump, where annular piston is provided for axial adjustment of impeller |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE911352C (en) * | 1943-01-17 | 1954-05-13 | Fritz Schupp | Gyroscope with device for mutual adjustment of the running and guide wheels |
| CH339496A (en) * | 1955-08-03 | 1959-06-30 | Sfindex | Centrifugal pump |
| US3404631A (en) * | 1966-06-09 | 1968-10-08 | Westinghouse Electric Corp | Centrifugal pump |
| FR1563183A (en) * | 1968-02-29 | 1969-04-11 | ||
| DE2510787A1 (en) * | 1975-03-08 | 1976-09-16 | Vaillant Joh Kg | Circulating pump for central heating - has impeller formed to act as shut off valve when pump stops |
| DE2640990A1 (en) * | 1976-09-11 | 1978-03-16 | Klein Schanzlin & Becker Ag | Centrifugal pump with axially compensated impeller - has axially fixed balance ring behind axially free impeller |
| DE19711178A1 (en) * | 1997-03-18 | 1998-09-24 | Wilo Gmbh | Pump in the hot water circuit of a central heating system |
| DE10115989A1 (en) * | 2000-04-04 | 2001-12-13 | Bernhard Stadler | Rotary circulation pump has an axially moveable motor rotor which is automatically positioned to block back circulation when in the quiescent mode |
-
2001
- 2001-09-14 DE DE2001145411 patent/DE10145411A1/en not_active Withdrawn
-
2002
- 2002-06-15 EP EP20020013218 patent/EP1293678B1/en not_active Expired - Lifetime
- 2002-06-15 DE DE50211038T patent/DE50211038D1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009011946A1 (en) * | 2009-03-10 | 2010-09-16 | Wilo Se | Electric motor for actuating a valve |
| EP4390137A1 (en) * | 2022-12-20 | 2024-06-26 | Wilo Se | Method for releasing a blockage of a waste water pump |
| BE1031160B1 (en) * | 2022-12-20 | 2024-07-15 | Wilo Se | Method for unclogging a sewage pump |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1293678A3 (en) | 2004-01-07 |
| EP1293678A2 (en) | 2003-03-19 |
| DE10145411A1 (en) | 2003-04-03 |
| DE50211038D1 (en) | 2007-11-29 |
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