EP1260714B1 - Pump unit with drive motor and submersible pump - Google Patents

Pump unit with drive motor and submersible pump Download PDF

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Publication number
EP1260714B1
EP1260714B1 EP01112676A EP01112676A EP1260714B1 EP 1260714 B1 EP1260714 B1 EP 1260714B1 EP 01112676 A EP01112676 A EP 01112676A EP 01112676 A EP01112676 A EP 01112676A EP 1260714 B1 EP1260714 B1 EP 1260714B1
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EP
European Patent Office
Prior art keywords
motor
assembly according
pump assembly
inner housing
drive motor
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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EP01112676A
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German (de)
French (fr)
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EP1260714A1 (en
Inventor
Lars Vestergaard Nielsen
Tom Jaeger
John Olsen
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Grundfos AS
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Grundfos AS
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Priority to EP01112676A priority Critical patent/EP1260714B1/en
Priority to DE50111547T priority patent/DE50111547D1/en
Publication of EP1260714A1 publication Critical patent/EP1260714A1/en
Application granted granted Critical
Publication of EP1260714B1 publication Critical patent/EP1260714B1/en
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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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0686—Mechanical details of the pump control unit
    • 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
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5813—Cooling the control unit

Definitions

  • the invention relates to a motor pump unit with an electric drive motor and a submersible associated centrifugal pump.
  • centrifugal pumps for pumping waste water in a well or basin such that the centrifugal pump is at least partially immersed in the wastewater, in which case the wastewater has reached its lowest level in the well.
  • the unit When the wastewater level has reached its highest level, the unit is usually completely submerged in the wastewater.
  • the electric drive motor of such pumps is equipped with a terminal box containing, in a known manner, the electrical control parts for automatically switching on and off and speed control of the drive motor, it must be ensured that the terminal box is watertight so as not to admit the electrical control parts damage and put it out of action.
  • the sealing material which is inserted between the lid and the rest of the box body of the terminal box, but has a limited life, so that the tightness of the terminal box is limited accordingly, including the aggressiveness of the pumped waste water contributes significantly.
  • the terminal box of such drive motors must therefore be checked for leaks in relatively short time intervals, with the sealing material being replaced if necessary.
  • the maintenance costs for a corresponding centrifugal pump unit are thus relatively high.
  • the terminal box of the centrifugal pump as a separate unit and to arrange this unit at a location in the well or basin that is not reached by the rising level of waste water in the well or basin.
  • the unit is then connected via an electrical cable to the functionally installed centrifugal pump.
  • the manufacture of such a separate unit is relatively expensive and there is not always a suitable place in the fountain for mounting the unit.
  • the insulating material of the electrical connection cable running from the unit to the centrifugal pump must be of special quality in order to be able to withstand the aggressiveness of the waste water.
  • the document DE-A-27 43 112 describes a motor pump unit with an electric drive motor and an associated submersible centrifugal pump comprising a rotatably mounted drive shaft with a rotor rotatably mounted thereon, a rotor surrounding the stator and a partially metallic motor housing with a centrifugal pump towards front end wall, wherein the motor housing, an inner housing, which carries the stator, consists of thermally conductive material and a housing surrounding the inner housing with a radial distance jacket for forming an annular space between the inner housing and this jacket. Said annular space is flowed through by the pumped fluid medium and the electrical means for operating the drive motor are arranged in a separate sealed space at the upper end of the unit.
  • the object of the invention is to improve an electric drive motor intended for a submerged in a pumped centrifugal electric drive motor of the kind mentioned in the introduction that the electrical control means for operating the drive motor, in particular for its automatic switching on and off and optionally to its speed control, are required, integrated in the engine and thus against damaging effects of the pumped medium
  • Centrifugal pump are permanently protected and that the drive motor is safely cooled even when dry installation of the unit.
  • the inventive solution eliminates the outside of the motor housing usually mounted terminal box with the known control means contained therein or a separate unit with the tax means in question including a connecting cable which connects the separate unit with the electric drive motor. All control means are now - separated from the mounting space of the power supply - contained in the annular space of the drive motor, which is sealed from the external engine environment that a damaging influence of the pumped medium, in which the engine is optionally immersed, is not given to the sealing material of the engine , Because the annular space has a relatively large volume, the electrical control parts can be arranged at the most advantageous places within the annular space, in addition to the possibility that a large number of control parts can be accommodated in the annular space, wherein the control parts themselves are not necessarily one Must have miniature construction.
  • the heat loss of the motor is safely dissipated to the pumped medium flowing through the pump.
  • the heat loss is passed from the inner housing of the drive motor to the front end wall of the drive motor, which in turn is acted upon by the pumped fluid of the pump.
  • the inner housing also serves as a heat sink for the heat loss that emanates from the electrical control parts in the mentioned annulus, for example, from the power section of a frequency converter.
  • the smooth surface of the unit reduces the risk of dirt accumulation.
  • a generally designated 1 motor pump unit which consists of an electric drive motor 2 and a submersible centrifugal pump 3.
  • the drive motor and the centrifugal pump are firmly connected to each other, for example, by a conventional clamping ring 4.
  • the drive motor has a drive shaft 5 rotatably mounted in its end regions, a rotor 6 arranged thereon in a rotationally fixed manner and an electric stator 7 which is radially opposite the rotor.
  • the stator 7 is rotatably mounted in a housing of the drive motor, said housing includes a front end wall 8, with which the centrifugal pump 3 is connected by means of the fastening ring 4.
  • the front end wall 8 is made of thermally conductive material and is acted upon on its the pump 3 facing surface 8a with a proportion of the flow of the centrifugal pump.
  • the housing of the electric drive motor 2 comprises in addition to the front end wall 8, a cylindrical inner housing 9 made of thermally conductive material, for example aluminum or an aluminum alloy, a rear end wall 10, which may be integrally formed with the inner housing or a special part connected thereto, and a jacket 11th This jacket surrounds the inner housing 9 at a radial distance, so that between these two parts an annular space 12 is formed, in which electrical means for operating the drive motor are arranged, as will become clear.
  • the jacket 11 is preferably made of stainless material and preferably of stainless steel with a wall thickness of 1 to 4 mm.
  • the jacket 11 may also be in the form of a bell or the like, it is formed in the shape shown in Fig. 1 as a parabolic stump. Alternatively, it may also be frusto-conical or tubular. On its outer surface, the jacket 11 is generally free of cooling fins. If desired, however, it may be provided on its outer side with cooling fins (not shown).
  • the motor housing of the electric drive motor 2 also includes a cover plate 13 which is fixed to the rear end of the inner housing 9. This attachment can be done by a central fastening screw 14 which is bolted to the inner housing.
  • the rear end of the inner housing has a bearing support member 15 which on the one hand has a bearing 16 for the rear rotatable mounting of the drive shaft 5 and on the other hand provided with a central threaded hole 17 for receiving the central fastening screw 14.
  • the end cover 13 has an introduction formation 18 for the introduction of a power supply cable (not shown) for the electrical power supply of the electrical, provided in the annular space 12 means for operating and controlling the drive motor.
  • a power supply cable (not shown) for the electrical power supply of the electrical
  • an introducer sheath 19 may be provided, with the aid of which the power supply cable is sealed from the environment.
  • the front end wall 8 has a peripheral flange 8b, on whose outer surface the one, the centrifugal pump 3 facing end portion of the shell 11 is sealed against the environment.
  • the seal can be made for example by elastic O-rings 20 which are angeordent in corresponding grooves of the peripheral flange 8b.
  • the substantially cylindrical inner housing 9 has a heat-conducting cross-section, which preferably increases toward the pump side of the electric drive motor 2. This can be achieved, for example, by providing the inner housing with cooling fins 22 extending radially outward, as best seen in FIG. 2. Additionally or alternatively, however, it is also possible that the cylindrical body of the inner housing, of which the electric stator 7 is held, is provided with a cross section which increases steadily toward the centrifugal pump 3.
  • the annular space 12 between the inner housing 9 and the casing 11 has a considerable size, both in the radial and in the axial direction.
  • This annular space is therefore excellently suited to receive the means for electrical operation of the drive motor 2.
  • Such Means are summarily indicated by the reference numeral 23 in Figs. 1 and 2.
  • Such resources are well known and include, for example, all of the terminals to provide electrical power to the electrical stator 7 as required.
  • the means 23 further comprise means for automatically switching on and off the drive motor and means for its speed control, which include, for example, a frequency converter. This list is not complete, so that all means that are important for the operation of the drive motor in question.
  • heat loss occurs both in the electric stator 7 and in some of the electrical equipment 23 in the annular space 12.
  • This heat loss is essentially dissipated via the material of the inner housing 9, namely towards the centrifugal pump 3.
  • the heat loss first reaches the front end wall 8 of the motor housing and is then removed from a portion of the flow of the centrifugal pump, which flows along the surface 8a of the end wall 8. As a result, an effective cooling of the electric drive motor 2 is given.

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

Description

Die Erfindung betrifft ein Motorpumpenaggregat mit einem elektrischen Antriebsmotor und einer eintauchbaren damit verbundenen kreiselpumpe.The invention relates to a motor pump unit with an electric drive motor and a submersible associated centrifugal pump.

Es ist in der Praxis bekannt, Kreiselpumpen zum Fördern von Abwasser so in einem Brunnen oder Becken zu installieren, dass die Kreiselpumpe wenigstens teilweise in das Abwasser eingetaucht ist, in welchem Fall das Abwasser seinen tiefsten Stand in dem Brunnen erreicht hat. Wenn der Abwasserpegel seinen höchsten Stand erreicht hat, ist das Aggregat in der Regel vollständig in das Abwasser eingetaucht. Wenn der elektrische Antriebsmotor solcher Pumpen mit einem Klemmenkasten, der in bekannter Weise die elektrischen Steuerteile zum automatischen Ein- und Ausschalten und zur Drehzahlregelung des Antriebsmotors enthält, ausgerüstet ist, so muss gewährleistet sein, dass der Klemmenkasten wasserdicht ist, um die elektrischen Steuerteile nicht zu schädigen und außer Funktion zu setzen. Das Dichtmaterial, welches zwischen dem Deckel und dem übrigen Kastenkörper des Klemmenkastens eingefügt ist, hat jedoch nur eine eingeschränkte Lebensdauer, so dass die Dichtigkeit des Klemmenkastens dementsprechend begrenzt ist, wozu auch die Aggressivität des zu fördernden Abwassers entscheidend beiträgt. Der Klemmenkasten solcher Antriebsmotoren muss daher in relativ kurzen Zeitintervallen auf Dichtigkeit überprüft werden, wobei das Dichtmaterial gegebenenfalls auszuwechseln ist. Die Wartungskosten für ein entsprechendes Kreiselpumpenaggregat sind somit relativ hoch.It is known in practice to install centrifugal pumps for pumping waste water in a well or basin such that the centrifugal pump is at least partially immersed in the wastewater, in which case the wastewater has reached its lowest level in the well. When the wastewater level has reached its highest level, the unit is usually completely submerged in the wastewater. If the electric drive motor of such pumps is equipped with a terminal box containing, in a known manner, the electrical control parts for automatically switching on and off and speed control of the drive motor, it must be ensured that the terminal box is watertight so as not to admit the electrical control parts damage and put it out of action. However, the sealing material, which is inserted between the lid and the rest of the box body of the terminal box, but has a limited life, so that the tightness of the terminal box is limited accordingly, including the aggressiveness of the pumped waste water contributes significantly. The terminal box of such drive motors must therefore be checked for leaks in relatively short time intervals, with the sealing material being replaced if necessary. The maintenance costs for a corresponding centrifugal pump unit are thus relatively high.

Zur Vermeidung dieser Nachteile ist vorgeschlagen worden, den Klemmenkasten von der Kreiselpumpe als gesonderte Einheit auszubilden und diese Einheit an einer Stelle im Brunnen oder Becken anzuordnen, die vom steigenden Pegelstand des Abwassers in dem Brunnen bzw. Becken nicht erreicht wird. Die Einheit ist dann über ein elektrisches Kabel mit der funktionsgemäß installierten Kreiselpumpe verbunden. Die Herstellung einer solchen gesonderten Einheit ist relativ teuer und es ist nicht immer ein geeigneter Platz im Brunnen zur Anbringung der Einheit vorhanden. Des weiteren muss das Isoliermaterial des elektrischen, von der Einheit zur Kreiselpumpe verlaufenden Verbindungskabels von besonderer Qualität sein, um der Aggressivität des Abwassers widerstehen zu können.To avoid these disadvantages, it has been proposed to form the terminal box of the centrifugal pump as a separate unit and to arrange this unit at a location in the well or basin that is not reached by the rising level of waste water in the well or basin. The unit is then connected via an electrical cable to the functionally installed centrifugal pump. The manufacture of such a separate unit is relatively expensive and there is not always a suitable place in the fountain for mounting the unit. Furthermore, the insulating material of the electrical connection cable running from the unit to the centrifugal pump must be of special quality in order to be able to withstand the aggressiveness of the waste water.

In der Druckschrift EP 0 599 204 A1 (GP 128) ist ein Tauchpumpenaggregat beschrieben, bei welchem der elektrische Antriebsmotor für die Pumpe von einem Aggregatgehäuse mit Abstand umgeben ist. Zwischen dem Gehäuse des Antriebsmotors und dem Aggregatgehäuse ist somit ein Ringraum ausgebildet, in dem des weiteren ein axiales Förderrohr verläuft, das den Förderauslass der Pumpe mit einem herausragenden Druckstutzen des Aggregatgehäuses verbindet. Das axiale Förderrohr hat untere Austrittslöcher und obere Eintrittslöcher, so dass von dem Abförderstrom der Pumpe ein Nebenstrom abgeleitet wird, der in den genannten Ringraum unten eingeleitet und aus diesem oben wieder abgeleitet wird. Der Nebenstrom ist ein Kühlstrom, um den elektrischen Antriebsmotor außen zu kühlen, so dass der Ringraum als ständig mit Kühlmedium durchströmter Kühlraum dient.The document EP 0 599 204 A1 (GP 128) describes a submerged pump unit in which the electric drive motor for the pump is surrounded by an aggregate housing at a distance. Between the housing of the drive motor and the unit housing thus an annular space is formed, in which further extends an axial conveying pipe which connects the delivery outlet of the pump with an outstanding discharge nozzle of the unit housing. The axial conveying tube has lower outlet holes and upper inlet holes, so that from the discharge flow of the pump, a side stream is discharged, which is introduced into said annular space below and derived from the above again. The secondary flow is a cooling flow in order to cool the electric drive motor on the outside, so that the annular space serves as a cooling medium constantly flowed through by cooling medium.

Die Druckschrift DE-A-27 43 112 beschreibt ein Motorpumpenaggregat mit einem elektrischen Antriebsmotor und einer damit verbundenen eintauchbaren Kreiselpumpe umfassend eine drehbar gelagerte Antriebswelle mit einem darauf drehfest angeordneten Rotor, einen den Rotor umgebenden Stator und ein teilweise metallisches Motorgehäuse mit einer zur Kreiselpumpe hin gerichteten vorderen Endwand, wobei das Motorgehäuse ein Innengehäuse, das den Stator trägt, aus wärmeleitendem Material besteht und einen das Innengehäuse mit radialem Abstand umgebenden Mantel zur Ausbildung eines Ringraumes zwischen dem Innengehäuse und diesem Mantel aufweist. Der genannte Ringraum wird vom gepumpten Fluidmedium durchströmt und die elektrischen Mittel zum Betrieb des Antriebsmotors sind in einem separaten abgedichteten Raum am oberen Ende des Aggregats angeordnet.The document DE-A-27 43 112 describes a motor pump unit with an electric drive motor and an associated submersible centrifugal pump comprising a rotatably mounted drive shaft with a rotor rotatably mounted thereon, a rotor surrounding the stator and a partially metallic motor housing with a centrifugal pump towards front end wall, wherein the motor housing, an inner housing, which carries the stator, consists of thermally conductive material and a housing surrounding the inner housing with a radial distance jacket for forming an annular space between the inner housing and this jacket. Said annular space is flowed through by the pumped fluid medium and the electrical means for operating the drive motor are arranged in a separate sealed space at the upper end of the unit.

Die Druckschriften DE-A-42 22 394 und US-A-5 332 369 betreffen (nicht eintauchbare) Kreiselpumpen und enthalten die Idee der Anordnung von Elektroteilen in einem vom Fördermedium nicht durchströmten Ringraum zwischen einem Innengehäuse und einem äußeren Mantel.The documents DE-A-42 22 394 and US-A-5 332 369 relate to centrifugal pumps (which can not be immersed) and contain the idea of arranging electrical parts in an annular space not flowed through by the conveying medium between an inner housing and an outer jacket.

Die Aufgabe der Erfindung besteht in der Verbesserung eines für eine in ein Fördermedium eintauchbare Kreiselpumpe bestimmten elektrischen Antriebsmotors der einleitend angeführten Art dahingehend, dass die elektrischen Steuermittel, die zum Betrieb des Antriebsmotors, insbesondere zu seinem automatischen Ein- und Ausschalten und gegebenenfalls zu seiner Drehzahlsteuerung, erforderlich sind, im Motor integriert und damit gegen schädigende Auswirkungen des Fördermediums derThe object of the invention is to improve an electric drive motor intended for a submerged in a pumped centrifugal electric drive motor of the kind mentioned in the introduction that the electrical control means for operating the drive motor, in particular for its automatic switching on and off and optionally to its speed control, are required, integrated in the engine and thus against damaging effects of the pumped medium

Kreiselpumpe dauerhaft geschützt sind und dass der Antriebsmotor auch bei trockener Aufstellung des Aggregates sicher gekühlt wird.Centrifugal pump are permanently protected and that the drive motor is safely cooled even when dry installation of the unit.

Die Lösung der Aufgabe ist in dem Anspruch 1 angeführt.The solution of the problem is given in the claim 1.

Durch die erfindungsgemäße Lösung entfällt der außen am Motorgehäuse üblicherweise angebrachte Klemmenkasten mit den darin enthaltenen, bekannten Steuermitteln bzw. eine gesonderte Einheit mit den in Rede stehenden Steuermitteln einschließlich eines Verbindungskabels, welches die gesonderte Einheit mit dem elektrischen Antriebsmotor verbindet. Sämtliche Steuermittel sind nun - vom Montageraum des Netzanschlusses getrennt - in dem Ringraum des Antriebsmotors enthalten, der so gegenüber der äußeren Motorumgebung abgedichtet ist, dass ein schädigender Einfluss des Fördermediums, in welches der Motor gegebenenfalls eingetaucht ist, auf das Dichtungsmaterial des Motors nicht gegeben ist. Weil der Ringraum ein relativ großes Volumen besitzt, können die elektrischen Steuerteile an den jeweils vorteilhaftesten Plätzen innerhalb des Ringraumes angeordnet werden, und zwar zusätzlich zu der Möglichkeit, dass eine große Anzahl von Steuerteilen in dem Ringraum unterbringbar ist, wobei die Steuerteile selbst nicht unbedingt eine Miniaturbauweise aufweisen müsssen. Außerdem ist gewährleistet, dass die Verlustwärme des Motors sicher an das die Pumpe durchströmende Fördermedium abgeleitet wird. Die Verlustwärme wird von dem Innengehäuse des Antriebsmotors zur vorderen Endwand des Antriebsmotors geleitet, die wiederum vom Fördermedium der Pumpe beaufschlagt wird. Gleichzeitig dient das Innengehäuse auch als Wärmeableiter für diejenige Verlustwärme, die von den elektrischen Steuerteilen in dem erwähnten Ringraum ausgeht, zum Beispiel von dem Leistungsteil eines Frequenzumrichters. Die glatte Oberfläche des Aggregats vermindert die Gefahr der Schmutzablagerung.The inventive solution eliminates the outside of the motor housing usually mounted terminal box with the known control means contained therein or a separate unit with the tax means in question including a connecting cable which connects the separate unit with the electric drive motor. All control means are now - separated from the mounting space of the power supply - contained in the annular space of the drive motor, which is sealed from the external engine environment that a damaging influence of the pumped medium, in which the engine is optionally immersed, is not given to the sealing material of the engine , Because the annular space has a relatively large volume, the electrical control parts can be arranged at the most advantageous places within the annular space, in addition to the possibility that a large number of control parts can be accommodated in the annular space, wherein the control parts themselves are not necessarily one Must have miniature construction. In addition, it is ensured that the heat loss of the motor is safely dissipated to the pumped medium flowing through the pump. The heat loss is passed from the inner housing of the drive motor to the front end wall of the drive motor, which in turn is acted upon by the pumped fluid of the pump. At the same time, the inner housing also serves as a heat sink for the heat loss that emanates from the electrical control parts in the mentioned annulus, for example, from the power section of a frequency converter. The smooth surface of the unit reduces the risk of dirt accumulation.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angeführt.Advantageous embodiments of the invention are set forth in the subclaims.

Die Erfindung ist nachstehend anhand eines in den anliegenden Zeichnungen dargestellten Ausführungsbeispieles näher erläutert. Es zeigen:

Fig. 1
einen Axialschnitt nach der Linie I - I in Fig. 2
Fig. 2
einen Querschnitt nach der Linie II - II in Fig. 1.
The invention is explained below with reference to an embodiment illustrated in the accompanying drawings. Show it:
Fig. 1
an axial section along the line I - I in Fig. 2nd
Fig. 2
a cross section along the line II - II in Fig. 1st

In Fig. 1 ist ein allgemein mit 1 bezeichnetes Motorpumpenaggregat dargestellt, das aus einem elektrischen Antriebsmotor 2 und einer eintauchbaren Kreiselpumpe 3 besteht. Der Antriebsmotor und die Kreiselpumpe sind beispielsweise durch einen üblichen Klemmring 4 miteinander fest verbunden. Der Antriebsmotor weist eine in ihren Endbereichen drehbar gelagerte Antriebswelle 5, einen darauf drehfest angeordneten Rotor 6 und einen dem Rotor radial gegenüberliegenden elektrischen Stator 7 auf. Der Stator 7 ist in einem Gehäuse des Antriebsmotors drehfest gelagert, wobei dieses Gehäuse eine vordere Endwand 8 einschließt, mit welcher die Kreiselpumpe 3 mittels des Befestigungsringes 4 verbunden ist. Die vordere Endwand 8 besteht aus wärmeleitendem Material und wird auf ihrer der Pumpe 3 zugekehrten Fläche 8a mit einem Anteil des Förderstroms der Kreiselpumpe beaufschlagt.In Fig. 1 a generally designated 1 motor pump unit is shown, which consists of an electric drive motor 2 and a submersible centrifugal pump 3. The drive motor and the centrifugal pump are firmly connected to each other, for example, by a conventional clamping ring 4. The drive motor has a drive shaft 5 rotatably mounted in its end regions, a rotor 6 arranged thereon in a rotationally fixed manner and an electric stator 7 which is radially opposite the rotor. The stator 7 is rotatably mounted in a housing of the drive motor, said housing includes a front end wall 8, with which the centrifugal pump 3 is connected by means of the fastening ring 4. The front end wall 8 is made of thermally conductive material and is acted upon on its the pump 3 facing surface 8a with a proportion of the flow of the centrifugal pump.

Das Gehäuse des elektrischen Antriebsmotors 2 umfasst neben der vorderen Endwand 8 ein zylindrisches Innengehäuse 9 aus wärmeleitendem Material, zum Beispiel Aluminium oder eine Aluminiumlegierung, eine hintere Endwand 10, die mit dem Innengehäuse einstückig ausgebildet oder ein damit verbundenes Sonderteil sein kann, und einen Mantel 11. Dieser Mantel umgibt das Innengehäuse 9 mit radialem Abstand, so dass zwischen diesen beiden Teilen ein Ringraum 12 ausgebildet ist, in dem elektrische Mittel zum Betrieb des Antriebsmotors angeordnet sind, wie noch klar wird. Der Mantel 11 besteht vorzugsweise aus nichtrostendem Material und vorzugsweise aus nichtrostendem Stahl mit einer Wandstärke von 1 bis 4 mm.The housing of the electric drive motor 2 comprises in addition to the front end wall 8, a cylindrical inner housing 9 made of thermally conductive material, for example aluminum or an aluminum alloy, a rear end wall 10, which may be integrally formed with the inner housing or a special part connected thereto, and a jacket 11th This jacket surrounds the inner housing 9 at a radial distance, so that between these two parts an annular space 12 is formed, in which electrical means for operating the drive motor are arranged, as will become clear. The jacket 11 is preferably made of stainless material and preferably of stainless steel with a wall thickness of 1 to 4 mm.

Obwohl der Mantel 11 auch in Form einer Glocke oder dergleichen ausgeführt sein kann, ist er in der in Fig. 1 gezeigten Form als Paraboloidstumpf ausgebildet. Alternativ hierzu kann er auch kegelstumpfförmig oder rohrförmig ausgebildet sein. Auf seiner Außenfläche ist der Mantel 11 im allgemeinen frei von Kühlrippen. Gewünschtenfalls kann er jedoch auf seiner Außenseite mit Kühlrippen versehen sein (nicht dargestellt).Although the jacket 11 may also be in the form of a bell or the like, it is formed in the shape shown in Fig. 1 as a parabolic stump. Alternatively, it may also be frusto-conical or tubular. On its outer surface, the jacket 11 is generally free of cooling fins. If desired, however, it may be provided on its outer side with cooling fins (not shown).

Das Motorgehäuse des elektrischen Antriebsmotors 2 enthält auch einen Abschlussdeckel 13, der am hinteren Ende des Innengehäuses 9 befestigt ist. Diese Befestigung kann durch eine zentrale Befestigungsschraube 14 erfolgen, die mit dem Innengehäuse verschraubt ist. Im gezeigten Fall weist das hintere Ende des Innengehäuses ein Lagertragteil 15 auf, welches einerseits ein Lager 16 für die hintere drehbare Lagerung der Antriebswelle 5 aufweist und andererseits mit einem zentralen Gewindeloch 17 für die Aufnahme der zentralen Befestigungsschraube 14 versehen ist.The motor housing of the electric drive motor 2 also includes a cover plate 13 which is fixed to the rear end of the inner housing 9. This attachment can be done by a central fastening screw 14 which is bolted to the inner housing. In the case shown, the rear end of the inner housing has a bearing support member 15 which on the one hand has a bearing 16 for the rear rotatable mounting of the drive shaft 5 and on the other hand provided with a central threaded hole 17 for receiving the central fastening screw 14.

Der Abschlussdeckel 13 weist eine Einführungsausbildung 18 für die Einführung eines Stromversorgungskabels (nicht gezeigt) für die elektrische Energieversorgung der elektrischen, im Ringraum 12 vorgesehenen Mittel zum Betrieb und Steuerung des Antriebsmotors auf. In der einen Durchgang darstellenden Einführungsausbildung 18 kann eine Einführungshülse 19 vorgesehen sein, mit deren Hilfe das Stromversorgungskabel gegenüber der Umgebung abgedichtet ist.The end cover 13 has an introduction formation 18 for the introduction of a power supply cable (not shown) for the electrical power supply of the electrical, provided in the annular space 12 means for operating and controlling the drive motor. In the introductory training 18 representing a passageway, an introducer sheath 19 may be provided, with the aid of which the power supply cable is sealed from the environment.

Die vordere Endwand 8 weist einen Umfangsflansch 8b auf, an dessen Außenfläche der eine, der Kreiselpumpe 3 zugekehrte Endbereich des Mantels 11 gegenüber der Umgebung abgedichtet anliegt. Die Abdichtung kann beispielsweise durch elastische O-Ringe 20 erfolgen, die in entsprechenden Nuten des Umfangflansches 8b angeordent sind.The front end wall 8 has a peripheral flange 8b, on whose outer surface the one, the centrifugal pump 3 facing end portion of the shell 11 is sealed against the environment. The seal can be made for example by elastic O-rings 20 which are angeordent in corresponding grooves of the peripheral flange 8b.

Das andere Ende des Mantels 11, welches dem Abschlussdeckel 13 zugekehrt ist, weist eine Rezessausbildung 21 auf, welche an dem hinteren Endteil 10 anliegt. Des weiteren greift der hintere Abschlussdeckel in den Rezess 21 ein, und zwar mittels der Befestigungskraft der zentralen Schraube 14 mit der Folge, dass der Mantel 11 mit seinem diesbezüglichen Ende gegen die hintere Endwand 10 gedrückt wird. Dadurch ist der Mantel 11 zwischen dem Abschlussdeckel 13 und der vorderen Endwand 8 eingespannt. Die sichere radiale Befestigung des Mantels 11 wird im Wesentlichen dadurch erzielt, dass das hintere Ende des Mantels formschlüssig ausgebildet ist, beispielsweise durch den Rezess 21, wobei der Mantel 11 des weiteren in seinem hinteren Bereich zwischen dem Abschlussdeckel 13 und der hinteren Endwand 10 eingeklemmt gehalten wird. Es reicht daher aus, dass der vordere Endbereich des Mantels 11 ohne eine weitere Festlegung lose, jedoch abgedichtet mittels der O-Ringe 20 außen an dem Umfangsflansch 8b der vorderen Endwand 8 anliegt.The other end of the shell 11, which is the end cap 13 faces, has a Rezessausbildung 21, which at the rear End part 10 is present. Furthermore, the rear end cover engages the recess 21 by means of the fastening force of the central screw 14 with the result that the shell 11 is pressed with its respective end against the rear end wall 10. As a result, the jacket 11 is clamped between the end cover 13 and the front end wall 8. The secure radial attachment of the shell 11 is essentially achieved in that the rear end of the shell is formed positively, for example by the recess 21, wherein the shell 11 further held clamped in its rear region between the end cover 13 and the rear end wall 10 becomes. It is therefore sufficient that the front end portion of the shell 11 rests without further fixing loose, but sealed by means of the O-rings 20 on the outside of the peripheral flange 8b of the front end wall 8.

Das im wesentlichen zylindrische Innengehäuse 9 weist einen wärmeleitenden Querschnitt auf, der sich vorzugsweise zur Pumpenseite des elektrischen Antriebsmotors 2 hin vergrößert. Dies kann beispielsweise dadurch erreicht werden, dass das Innengehäuse mit sich radial auswärts erstreckenden Kühlrippen 22 versehen ist, wie es am besten aus Fig. 2 zu erkennen ist. Zusätzlich oder alternativ ist es jedoch auch möglich, dass sich der zylindrische Körper des Innengehäuses, von welchem der elektrische Stator 7 gehalten wird, mit einem Querschnitt versehen ist, der sich zur Kreiselpumpe 3 hin stetig vergrößert.The substantially cylindrical inner housing 9 has a heat-conducting cross-section, which preferably increases toward the pump side of the electric drive motor 2. This can be achieved, for example, by providing the inner housing with cooling fins 22 extending radially outward, as best seen in FIG. 2. Additionally or alternatively, however, it is also possible that the cylindrical body of the inner housing, of which the electric stator 7 is held, is provided with a cross section which increases steadily toward the centrifugal pump 3.

Wie aus den Fig. 1 und 2 sehr deutlich zu erkennen ist, weist der Ringraum 12 zwischen dem Innengehäuse 9 und dem Mantel 11 eine beträchtliche Größe auf, und zwar sowohl in radialer als auch in axialer Richtung. Dieser Ringraum ist daher vorzüglich dafür geeignet, die Mittel zum elektrischen Betrieb des Antriebsmotors 2 aufzunehmen. Solche Mittel sind summarisch mit dem Bezugszeichen 23 in den Fig. 1 und 2 angegeben. Derartige Betriebsmittel sind allgemein bekannt und umfassen beipielsweise sämtliche Klemmen, um den elektrischen Stator 7 in der erforderlichen Weise mit elektrischer Energie zu versorgen. Die Mittel 23 umfassen des weiteren Mittel zum automatischen Ein- und Ausschalten des Antriebsmotors und Mittel zu seiner Drehzahlsteuerung, die beispielsweise einen Frequenzumrichter enthalten. Diese Aufzählung ist nicht vollständig, so dass alle Mittel in Frage kommen, die für den Betrieb des Antriebsmotors von Bedeutung sind.As can be seen very clearly from FIGS. 1 and 2, the annular space 12 between the inner housing 9 and the casing 11 has a considerable size, both in the radial and in the axial direction. This annular space is therefore excellently suited to receive the means for electrical operation of the drive motor 2. Such Means are summarily indicated by the reference numeral 23 in Figs. 1 and 2. Such resources are well known and include, for example, all of the terminals to provide electrical power to the electrical stator 7 as required. The means 23 further comprise means for automatically switching on and off the drive motor and means for its speed control, which include, for example, a frequency converter. This list is not complete, so that all means that are important for the operation of the drive motor in question.

Im Betrieb des beschriebenen Motorpumpenaggregates 1 entsteht Verlustwärme sowohl im elektrischen Stator 7 als auch an einigen der elektrischen Betriebsmittel 23 in dem Ringraum 12. Diese Verlustwärme wird im wesentlichen über das Material des Innengehäuses 9 abgeführt, und zwar zur Kreiselpumpe 3 hin. Hierbei gelangt die Verlustwärme zunächst an die vordere Endwand 8 des Motorgehäuses und wird dann von einem Anteil des Förderstromes der Kreiselpumpe, welcher an der Fläche 8a der Endwand 8 entlangströmt, abgeführt. Hierdurch ist eine wirksame Kühlung des elektrischen Antriebsmotors 2 gegeben.During operation of the described motor pump unit 1, heat loss occurs both in the electric stator 7 and in some of the electrical equipment 23 in the annular space 12. This heat loss is essentially dissipated via the material of the inner housing 9, namely towards the centrifugal pump 3. In this case, the heat loss first reaches the front end wall 8 of the motor housing and is then removed from a portion of the flow of the centrifugal pump, which flows along the surface 8a of the end wall 8. As a result, an effective cooling of the electric drive motor 2 is given.

Claims (13)

  1. A motor pump assembly with an electrical drive motor (2) and with a submersible centrifugal pump connected thereto, wherein the drive motor (2) comprises a rotatably mounted drive shaft (5) with a rotor (6) arranged thereon in a rotationally fixed manner, a stator (7) surrounding the rotor (6), and a motor housing leading away heat, with a front end wall (8) connectable to the centrifugal pump, the motor housing carries an inner housing (9) which carries the stator (7), consists of heat-conducting material and is in heat-conducting contact with the front end wall (8) which may be impinged on its pump side (8a) with delivery medium of the centrifugal pump, and a casing (11) surrounding the inner housing (9) at a radial distance, for forming an annular space (12) between the inner housing and this casing, said space being sealed with respect to the outer motor surroundings and in which annular space (11) electrical means (23) for operation of the drive motor (2) are arranged, wherein the sealing of the annular space (12) is such that a harmful influence of the delivery medium is not given.
  2. A motor pump assembly according to claim 1, characterised in that the casing (11) consists of non-rusting metal.
  3. A motor pump assembly according to claim 1 or 2, characterised in that the motor housing comprises a closure cover (13) which is fastened at the rear end of the inner housing (9).
  4. A motor pump assembly according to claim 3, characterised in that the casing (11) is designed in a tubular manner, in the manner of a truncated cone or in the shape of a truncated paraboloid.
  5. A motor pump assembly according to claim 3 or 4, characterised in that the casing (11) with its two ends are clamped between the front end wall (8) and the closure cover (13).
  6. A motor pump assembly according to claim 5, characterised in that the casing (11) with its two ends engages with a positive fit on the front end wall (8) and on the rear closure cover (13), and is fastened on the rear end of the inner housing (9) in a clamping manner by way of the closure cover.
  7. A motor pump assembly according to claim 6, characterised in that the closure cover (13) is connected to the inner housing by way of a central fastening screw (14).
  8. A motor pump assembly according to claim 7, characterised in that a bearing carrier part (15) for the rotatable mounting of the drive shaft (5) is provided at the rear end of the inner housing (9) and that the bearing carrier part (15) comprises a central threaded hole (17) for receiving the central fastening screw (14).
  9. A motor pump assembly according to one of the claims 1 to 8, characterised in that the inner housing (9) is provided with radially outwardly extending cooling ribs (22).
  10. A motor pump assembly according to one of the claims 1 to 9, characterised in that the inner housing (9) consists of aluminium or an aluminium alloy.
  11. A motor pump assembly according to one of the claims 1 to 10, characterised in that the heat-conducting cross-section of the inner housing (9) increases towards the pump side of the drive motor (2).
  12. A motor pump assembly according to one of claims 3 to 11, characterised in that the closure cover (13) comprises an introduction formation (18) for introducing an electricity supply cable for the electrical energy supply of the electrical means (23) for the operation of the drive motor (2).
  13. A motor pump assembly according to one of the claim 1 to 12, characterised in that the casing (11) is provided with cooling ribs on its outer side.
EP01112676A 2001-05-25 2001-05-25 Pump unit with drive motor and submersible pump Expired - Lifetime EP1260714B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01112676A EP1260714B1 (en) 2001-05-25 2001-05-25 Pump unit with drive motor and submersible pump
DE50111547T DE50111547D1 (en) 2001-05-25 2001-05-25 Motor pump unit with electric drive motor and submersible centrifugal pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01112676A EP1260714B1 (en) 2001-05-25 2001-05-25 Pump unit with drive motor and submersible pump

Publications (2)

Publication Number Publication Date
EP1260714A1 EP1260714A1 (en) 2002-11-27
EP1260714B1 true EP1260714B1 (en) 2006-11-29

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EP01112676A Expired - Lifetime EP1260714B1 (en) 2001-05-25 2001-05-25 Pump unit with drive motor and submersible pump

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EP (1) EP1260714B1 (en)
DE (1) DE50111547D1 (en)

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US11808268B2 (en) 2020-10-19 2023-11-07 Milwaukee Electric Tool Corporation Stick pump assembly

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DE102006016981A1 (en) * 2006-04-06 2007-10-11 Alfred Kärcher Gmbh & Co. Kg submersible pump
GB0703129D0 (en) * 2007-02-17 2007-03-28 Dlp Ltd An electrical shower-waste pump and control unit
GB202002218D0 (en) 2020-02-18 2020-04-01 Bowman Power Group Ltd Electric Turbomachines
US11668323B2 (en) * 2021-06-28 2023-06-06 Garrett Transportation I Inc. Coolant system for integrated e-machine controller for turbomachine
IT202100016853A1 (en) * 2021-06-28 2022-12-28 Dab Pumps Spa IMPROVED MAINTENANCE IMMERSION PUMP
US11781565B2 (en) * 2021-06-28 2023-10-10 Garrett Transportation I Inc. Integrated e-machine controller for turbomachine having fastener arrangement for electronics components

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DE2743112A1 (en) * 1977-09-24 1979-04-05 Albert Blum Electrically driven pump assembly - has motor housing formed of synthetic plastics and corrosion proof steel to resist heat influence
DE4121430C1 (en) * 1991-06-28 1992-11-05 Grundfos International A/S, Bjerringbro, Dk
DE4222394C1 (en) * 1992-07-08 1993-12-09 Grundfos A S Bjerringbro Electric pump unit with cooled frequency regulator - has power stage of frequency regulator mounted on cooling wall between spiral pump housing and electric motor
DE4239071C2 (en) 1992-11-20 1997-01-30 Grundfos As Submersible pump unit
DE19703655C2 (en) * 1997-01-31 2000-01-05 Spn Schwaben Praezision Fritz Electric drive
FR2772207B1 (en) * 1997-12-04 2004-11-26 France Etat AUTOSYNCHRONOUS ALTERNATIVE ELECTRIC MOTOR
DE19904148C1 (en) * 1999-02-03 2000-10-12 Pierburg Ag Electric feed pump

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Publication number Priority date Publication date Assignee Title
US11808268B2 (en) 2020-10-19 2023-11-07 Milwaukee Electric Tool Corporation Stick pump assembly

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EP1260714A1 (en) 2002-11-27
DE50111547D1 (en) 2007-01-11

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