EP1288501A2 - Pump pressure sensor - Google Patents

Pump pressure sensor Download PDF

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Publication number
EP1288501A2
EP1288501A2 EP02018885A EP02018885A EP1288501A2 EP 1288501 A2 EP1288501 A2 EP 1288501A2 EP 02018885 A EP02018885 A EP 02018885A EP 02018885 A EP02018885 A EP 02018885A EP 1288501 A2 EP1288501 A2 EP 1288501A2
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EP
European Patent Office
Prior art keywords
drive motor
pressure sensor
motor housing
end wall
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02018885A
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German (de)
French (fr)
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EP1288501A3 (en
EP1288501B1 (en
Inventor
John Olsen
Tom Jaeger
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Grundfos AS
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Grundfos AS
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Publication of EP1288501A2 publication Critical patent/EP1288501A2/en
Publication of EP1288501A3 publication Critical patent/EP1288501A3/en
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Publication of EP1288501B1 publication Critical patent/EP1288501B1/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
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
    • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the invention is based on an electric drive motor for a in Wastewater submersible centrifugal pump according to the preamble of Claim 1.
  • centrifugal pump which is driven by an electric drive motor, from a well in which the wastewater has collected j wherein the centrifugal pump is immersed with its suction in the collected wastewater.
  • the electric drive motor is associated with a pressure sensor, which is acted upon by the amount of waste water when its level has reached a predetermined upper level in the well in which the pressure sensor is located.
  • the pressure sensor then conducts a signal via a cable to an electrical switching unit which switches on the electric drive motor, whereupon the centrifugal pump begins to pump until the waste water level has dropped so low that only the suction area of the centrifugal pump is submerged in the wastewater quantity in the well.
  • the centrifugal pump then turns off and then on again when the above-mentioned upper switching level is reached again.
  • the pressure sensor hangs on the electrical cable running in the well, leading to said switching unit located at a waste-water-free location inside or outside the well. From there, an electrical control cable runs to the drive motor of the centrifugal pump to turn this on and off.
  • the described arrangement and assembly of the pressure sensor are time consuming and costly and in the case of maintenance of the unit formed from the centrifugal pump and the drive motor and / or the well, the free-hanging cable can be easily damaged with the pressure sensor. Furthermore, the pressure sensor and the cable carrying it can be destroyed by particularly aggressive wastewater and thus become inoperative.
  • the object of the invention is to improve an electrical Drive motor of the kind mentioned in the introduction, in which the Pressure sensor quickly and inexpensively mounted and damage-resistant and is arranged functionally reliable.
  • the inventive arrangement of the pressure sensor d. H. by its arrangement within the housing of the electric drive motor, the pressure sensor is arranged protected, so he in particular during maintenance work on the motor pump unit in the Well and not damaged during maintenance work on the inside of the well can be and is arranged so far functionally reliable.
  • the pressure sensor is simple and fast and inexpensive mountable during engine production, especially the cable on which the pressure sensor is otherwise suspended, now omitted.
  • Protective means for example in the form of a protective jacket, which avoid that the pressure sensor the damaging effects of the aggressive Wastewater is exposed.
  • Another important advantage is that in space-saving way an extremely large inlet cross-section for the introduction of the water pressure in the connecting channel for admission the connected pressure sensor with each prevailing water pressure is created. This is practical no risk of blockage for the inlet channel with the still further Advantage that the separate cleaning of the inlet channel between the usual maintenance intervals of the wastewater pump is not required is.
  • An advantageous embodiment of the drive motor according to the invention is that the inlet channel as an annular gap between the peripheral wall the motor housing and the wall opposite Surface of the front end wall of the motor housing is formed. This ensures that the inlet channel a very large inlet cross-section, which extend at most around the circumference of the engine can, is available, so that too a relatively large amount Solids in the wastewater does not cause a blockage that hinders function the inlet channel leads, because still enough free Inlet cross section is available.
  • the width of the annular gap is smaller as the depth of the adjoining and to the pressure sensor leading connection channel.
  • FIG. 1 shows a motor pump unit for the removal of waste water, collected in the usual way in a well or reservoir to have.
  • This unit consists of an electric drive motor 1 and from a centrifugal pump 2. Both parts are in common Way held together by a clamping ring 30.
  • the drive motor 1 comprises a motor housing 3 with a peripheral wall 4 and a front end wall 5, wherein the front end wall is connected by means of the clamping ring 30 with the centrifugal pump 2.
  • Motor housing 3 is a space 6 is provided, for example, as an annular space is formed and between the peripheral wall 4 and a Stator 7 is located, which is the usual electric stator 8 of the Motors 1 carries.
  • the room 6 In the room 6 are the usual electrical terminals and other electrical control parts 9 for switching on and off provided the drive motor 1.
  • a pressure sensor 10 is arranged, in the shown example at a front end flange 7a of the stator 7.
  • This pressure sensor is charged with the water pressure of the wastewater, in which the centrifugal pump at least partially immersed is.
  • an inlet channel 11 is provided, which is between the peripheral wall 4 of the motor housing 3 and the front end wall 5 of the motor housing is trained.
  • At the inlet channel 11 is followed by a the front end wall extending connecting channel 12, on the other hand extends to the pressure sensor 10.
  • the pressure sensor of the currently prevailing water pressure of the wastewater acted upon and in turn directs corresponding signals to the electrical Control parts 9 in the engine compartment. 6
  • the example structure and course of the circumferential annular gap gebideteten inlet channel 11 and the adjoining Connection channels 12 can best be seen in FIGS. 2 and 3 be seen.
  • the width of the annular gap 11 is about 1.5 to 4.0 mm, advantageous about 2.0 to 3.0 mm.
  • Figs. 1, 2 and 3 is the Annular gap 11 with its annular inlet region 11a to the environment the drive motor open.
  • the circumferential Ring gap also extend in the radial direction or a radial have annular inlet area.
  • the peripheral wall 4 and the end wall 5 of the engine 1 radially extending end portions on or are formed accordingly (not shown).
  • an inlet groove system which in the Connecting channel 12 opens, as a hole through the front End wall 5 passes through to the inner space 6 of the engine 1.
  • One Such groove system includes z. B. a common arcuate or annular entrance groove shallow depth, in the peripheral wall 4 or in the end wall 5 or partially formed in these two walls, and a plurality of outgoing and to the connection channel 12th extending feed grooves (not shown). The width of the entrance groove becomes chosen as the width of the annular gap.
  • the pressure sensor 10 located in the space 6 has a rigid housing 13, which is provided with an extension 14, which has a connection channel 15 has.
  • the extension 14 protrudes into the connecting channel 12, so that the pressure sensor 10 via the connection channel 15 from the connecting channel 12 is applied.
  • the stator carrier 7 connected to a front end flange 7a, which in turn with the front end wall 5 of the motor housing 3 is firmly connected.
  • the end flange 7a is provided with a passage 16 having a Extension portion of the connecting channel 12 forms.
  • the pressure sensor 10 to attach directly to the front end wall 5.
  • the housing 13 of the pressure sensor is seen with two through holes 17 and 18, through which screws (not shown) run, with which the Pressure sensor on the end flange 7a and / or on the front end wall 5 is screwed.
  • the extension 14 of the housing 13 is provided with a front Ring groove 19 provided, in which an elastic sealing ring 20th is inserted to the connecting channel 12 relative to the inner To seal space 9 of the motor housing 3.
  • the pressure sensor 10 is within of the room 6 by means of a short electrical line 21 to the also located in the room 6 electrical control parts 9 of the drive motor 1 connected.
  • the advantageous in the form of two apt holes trained Connecting channel 12 has a diameter that is greater than the width the inlet channel 11 in the form of the annular gap.
  • the advantage is the Diameter of the connection channel 4.0 to 8.0 mm.
  • an inflow groove extending at least partially around the surface 5a 22 may be provided, which via a groove-shaped cross-connection 23 in the connecting channel 12 opens.
  • This inflow groove 22 is advantageous near the inlet region 11 a of the annular gap-shaped inlet channel 11 intended.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Measuring Fluid Pressure (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The device has a housing with a peripheral wall and a front wall for connection to the pump and a pressure sensor exposed to waste water for switching the motor on and off arranged in a space in the motor housing. An inlet channel open to the surroundings between the peripheral wall and an opposing front wall surface is connected to a channel leading through the front wall to the space bounding on this end wall and to the pressure sensor. The device has a housing with a peripheral wall and a front wall (5) for connection to the pump and an associated pressure sensor (10) exposed to the waste water for switching the motor on and off. The pressure sensor is arranged in a space (6) in the motor housing (3). An inlet channel (11) open to the surroundings between the peripheral wall and an opposing surface of the front wall is connected to a channel (12) leading through the front wall to the space bounding on this end wall and to the pressure sensor.

Description

Die Erfindung geht aus von einem elektrischen Antriebsmotor für eine in Abwasser eintauchbare Kreiselpumpe gemäß dem Oberbegriff des Anspruchs 1.The invention is based on an electric drive motor for a in Wastewater submersible centrifugal pump according to the preamble of Claim 1.

Es ist bekannt, Abwässer mittels einer Kreiselpumpe, die von einem elektrischen Antriebsmotor angetrieben wird, aus einem Brunnen abzufördern, in dem sich die Abwässer gesammelt haben j wobei die Kreiselpumpe mit ihrem Saugbereich in die gesammelte Abwassermenge eingetaucht ist. Dem elektrischen Antriebsmotor ist ein Drucksensor zugeordnet, der von der Abwassermenge beaufschlagt wird, wenn deren Pegelstand eine vorbestimmte obere Höhe in dem Brunnen, in dem sich der Drucksensor befindet, erreicht hat. Der Drucksensor leitet dann über ein Kabel ein Signal an eine elektrische Schalteinheit, die den elektrischen Antriebsmotor einschaltet, woraufhin die Kreiselpumpe zu fördern beginnt, bis der Abwasserpegelstand so weit abgesunken ist, dass nur noch der Saugbereich der Kreiselpumpe in der Abwassermenge im Brunnen eingetaucht ist. Die Kreiselpumpe schaltet sich dann ab und erst dann wieder ein, wenn der vorerwähnte obere Schaltpegelstand wieder erreicht ist. Der Drucksensor hängt an dem in dem Brunnen verlaufenden elektrischen Kabel, das zu der genannten Schalteinheit führt, die an einer abwasserfreien Stelle innerhalb oder außerhalb des Brunnens angeordnet ist. Von dort verläuft ein elektrisches Steuerkabel zu dem Antriebsmotor der Kreiselpumpe, um diesen ein- und auszuschalten. Die beschriebene Anordnung und Montage des Drucksensors sind zeit- und kostenaufwändig und im Wartungsfall des aus der Kreiselpumpe und dem Antriebsmotor gebildeten Aggregates und/oder des Brunnens kann das freihängende Kabel mit dem Drucksensor leicht beschädigt werden. Des weiteren kann der Drucksensor und das ihn tragende Kabel durch besonders aggressive Abwässer zerstört und dadurch funktionsunfähig werden.It is known to discharge sewage by means of a centrifugal pump, which is driven by an electric drive motor, from a well in which the wastewater has collected j wherein the centrifugal pump is immersed with its suction in the collected wastewater. The electric drive motor is associated with a pressure sensor, which is acted upon by the amount of waste water when its level has reached a predetermined upper level in the well in which the pressure sensor is located. The pressure sensor then conducts a signal via a cable to an electrical switching unit which switches on the electric drive motor, whereupon the centrifugal pump begins to pump until the waste water level has dropped so low that only the suction area of the centrifugal pump is submerged in the wastewater quantity in the well. The centrifugal pump then turns off and then on again when the above-mentioned upper switching level is reached again. The pressure sensor hangs on the electrical cable running in the well, leading to said switching unit located at a waste-water-free location inside or outside the well. From there, an electrical control cable runs to the drive motor of the centrifugal pump to turn this on and off. The described arrangement and assembly of the pressure sensor are time consuming and costly and in the case of maintenance of the unit formed from the centrifugal pump and the drive motor and / or the well, the free-hanging cable can be easily damaged with the pressure sensor. Furthermore, the pressure sensor and the cable carrying it can be destroyed by particularly aggressive wastewater and thus become inoperative.

Die Aufgabe der Erfindung besteht in der Verbesserung eines elektrischen Antriebsmotors der einleitend angeführten Art, bei dem der Drucksensor schnell und kostengünstig montierbar sowie beschädigungssicher und funktionssicher angeordnet ist.The object of the invention is to improve an electrical Drive motor of the kind mentioned in the introduction, in which the Pressure sensor quickly and inexpensively mounted and damage-resistant and is arranged functionally reliable.

Die Lösung dieser Aufgabe ist in dem Anspruch 1 angeführt.The solution to this problem is stated in claim 1.

Durch die erfindungsgemäße Anordnung des Drucksensors, d. h. durch seine Anordnung innnerhalb des Gehäuses des elektrischen Antriebsmotors, ist der Drucksensor geschützt angeordnet, so dass er insbesondere bei Wartungsarbeiten an dem Motorpumpenaggregat in dem Brunnen und bei Wartungsarbeiten an dem Brunneninneren nicht beschädigt werden kann und insoweit funktionssicher angeordnet ist. Des weiteren ist der Drucksensor einfach und schnell und kostengünstig während der Motorherstellung montierbar, zumal das Kabel, an welchem der Druchsensor sonst aufgehängt ist, nunmehr entfällt. Durch die innere Anordnung des Drucksensors in dem Motorgehäuse entfallen Schutzmittel, beispielsweise in Form eines Schutzmantels, welche vermeiden, dass der Drucksensor den schädigenden Wirkungen der aggressiven Abwässer ausgesetzt ist. Ein weiterer wichtiger Vorteil besteht darin, dass auf platzsparende Weise ein äußerst großer Eintrittsquerschnitt für die Einleitung des Wasserdruckes in den Verbindungskanal zur Beaufschlagung des daran angeschlossenen Drucksensors mit dem jeweils herrschenden Wasserdruck geschaffen ist. Dadurch besteht praktisch keine Verstopfungsgefahr für den Einlaufkanal mit dem noch weiteren Vorteil, dass die gesonderte Reinigung des Einlaufkanals zwischen den üblichen Wartungsintervallen der Abwasserkreiselpumpe nicht erforderlich ist.The inventive arrangement of the pressure sensor, d. H. by its arrangement within the housing of the electric drive motor, the pressure sensor is arranged protected, so he in particular during maintenance work on the motor pump unit in the Well and not damaged during maintenance work on the inside of the well can be and is arranged so far functionally reliable. Of Further, the pressure sensor is simple and fast and inexpensive mountable during engine production, especially the cable on which the pressure sensor is otherwise suspended, now omitted. By the internal arrangement of the pressure sensor in the motor housing omitted Protective means, for example in the form of a protective jacket, which avoid that the pressure sensor the damaging effects of the aggressive Wastewater is exposed. Another important advantage is that in space-saving way an extremely large inlet cross-section for the introduction of the water pressure in the connecting channel for admission the connected pressure sensor with each prevailing water pressure is created. This is practical no risk of blockage for the inlet channel with the still further Advantage that the separate cleaning of the inlet channel between the usual maintenance intervals of the wastewater pump is not required is.

Eine vorteilhafte Ausgestaltung des erfindungsgemäßen Antriebsmotors besteht darin, dass der Einlaufkanal als Ringspalt zwischen der Umfangswand des Motorgehäuses und der dieser Wand gegenüberliegenden Fläche der vorderen Endwand des Motorgehäuses ausgebildet ist. Dadurch ist sichergestellt, dass dem Einlaufkanal ein sehr großer Einlaufquerschnitt, der sich maximal um den Umfang des Motors erstrecken kann, zur Verfügung steht, so dass auch eine relativ große Menge an Feststoffen in dem Abwasser nicht zu einer funktionshindernden Verstopfung des Einlaufkanales führt, weil immer noch ausreichend freier Einlaufquerschnitt zur Verfügung steht.An advantageous embodiment of the drive motor according to the invention is that the inlet channel as an annular gap between the peripheral wall the motor housing and the wall opposite Surface of the front end wall of the motor housing is formed. This ensures that the inlet channel a very large inlet cross-section, which extend at most around the circumference of the engine can, is available, so that too a relatively large amount Solids in the wastewater does not cause a blockage that hinders function the inlet channel leads, because still enough free Inlet cross section is available.

In weiterer vorteilhafter Ausbildung ist die Weite des Ringspaltes kleiner als die Tiefe des sich daran anschließenden und zu dem Drucksensor führenden Verbindungskanales. Hierdurch wird eine gewisse Sperrwirkung für die in den Ringspalt eindringenden Feststoffanteile bewirkt, da diese in dem Ringspalt festgehalten werden und so nicht weiter zum Drucksensor vordringen können.In a further advantageous embodiment, the width of the annular gap is smaller as the depth of the adjoining and to the pressure sensor leading connection channel. As a result, a certain barrier effect causes for the penetrating into the annular gap solids content, because they are held in the annular gap and so not to Pressure sensor can penetrate.

In einer anderen vorteilhaften Ausbildung ist in der der Umfangswand gegenüberliegenden Fläche der vorderen Endwand des Motorgehäuses, welche Fläche den vorerwähnten Ringspalt auf der einen Seite begrenzt, eine sich wenigstens teilweise um diese Fläche erstreckende und in den Verbindungskanal einmündende Zuströmrille vorgesehen. Hierdurch wird sichergestellt, dass der Drucksensor auch dann noch schnell und zuverlässig mit dem Druck des Abwassers beaufschlagt wird, wenn der Eintrittsbereich des Ringspaltes in Nähe des Eintrittsbereiches des Verbindungskanales stark verstopft sein sollte.In another advantageous embodiment is in the peripheral wall opposite surface of the front end wall of the motor housing, which area the aforementioned annular gap on one side limited, at least partially extending around this surface and provided in the connecting channel inlet inflow groove. This will ensure that the pressure sensor will still work is applied quickly and reliably with the pressure of the wastewater, if the entrance area of the annular gap near the entrance area of the connecting channel should be heavily blocked.

Die Erfindung ist nachstehend anhand eines in der anliegenden Zeichnung dargestellten Ausführungsbeispieles erläutert. Es zeigen:

Fig. 1
einen Axialschnitt durch das Ausführungsbeispiel,
Fig.2
einen teilweisen Schnitt der Einzelheit X in Fig. 1 in vergrößertem Maßstab,
Fig. 3
eine geänderte Ausführung des Beispiels nach Fig. 2,
Fig. 4
ein Drucksensorgehäuse in perspektivischer Darstellung.
The invention is explained below with reference to an embodiment shown in the accompanying drawings. Show it:
Fig. 1
an axial section through the embodiment,
Fig.2
a partial section of the detail X in Fig. 1 on an enlarged scale,
Fig. 3
a modified embodiment of the example of FIG. 2,
Fig. 4
a pressure sensor housing in perspective view.

Fig. 1 zeigt ein Motorpumpenaggregat zum Abfördern von Abwässern, die sich in üblicher Weise in einem Brunnen oder Sammelbecken gesammelt haben. Dieses Aggregat besteht aus einem elektrischen Antriebsmotor 1 und aus einer Kreiselpumpe 2. Beide Teile werden in üblicher Weise mittels eines Klemmringes 30 zusammengehalten.1 shows a motor pump unit for the removal of waste water, collected in the usual way in a well or reservoir to have. This unit consists of an electric drive motor 1 and from a centrifugal pump 2. Both parts are in common Way held together by a clamping ring 30.

Der Antriebsmotor 1 umfasst ein Motorgehäuse 3 mit einer Umfangswand 4 und einer vorderen Endwand 5, wobei die vordere Endwand mittels des Klemmringes 30 mit der Kreiselpumpe 2 verbunden ist. In dem Motorgehäuse 3 ist ein Raum 6 vorgesehen, der beispielsweise als Ringraum ausgebildet ist und sich zwischen der Umfangswand 4 und einem Statorträger 7 befindet, welcher den üblichen elektrischen Stator 8 des Motors 1 trägt. In dem Raum 6 sind die üblichen elektrischen Anschlussklemmen und sonstige elektrische Steuerteile 9 für das Ein- und Ausschalten des Antriebsmotors 1 vorgesehen.The drive motor 1 comprises a motor housing 3 with a peripheral wall 4 and a front end wall 5, wherein the front end wall is connected by means of the clamping ring 30 with the centrifugal pump 2. By doing Motor housing 3 is a space 6 is provided, for example, as an annular space is formed and between the peripheral wall 4 and a Stator 7 is located, which is the usual electric stator 8 of the Motors 1 carries. In the room 6 are the usual electrical terminals and other electrical control parts 9 for switching on and off provided the drive motor 1.

In dem Raum 6 ist auch ein Drucksensor 10 angeordnet, und zwar im gezeigten Beispiel an einem vorderen Endflansch 7a des Statorträgers 7. Dieser Drucksensor wird mit dem Wasserdruck des Abwassers beaufschlagt, in welches die Kreiselpumpe wenigstens teilweise eingetaucht ist. Hierzu ist ein Einlaufkanal 11 vorgesehen, der zwischen der Umfangswand 4 des Motorgehäuses 3 und der vorderen Endwand 5 des Motorgehäuses ausgebildet ist. An den Einlaufkanal 11 schließt sich ein durch die vordere Endwand verlaufender Verbindungskanal 12 an, der andererseits zu dem Drucksensor 10 verläuft. Somit wird der Drucksensor von dem gerade herrschenden Wasserdruck des Abwassers beaufschlagt und leitet seinerseits dementsprechende Signale an die elektrischen Steuerteile 9 in den Motorraum 6.In the space 6 and a pressure sensor 10 is arranged, in the shown example at a front end flange 7a of the stator 7. This pressure sensor is charged with the water pressure of the wastewater, in which the centrifugal pump at least partially immersed is. For this purpose, an inlet channel 11 is provided, which is between the peripheral wall 4 of the motor housing 3 and the front end wall 5 of the motor housing is trained. At the inlet channel 11 is followed by a the front end wall extending connecting channel 12, on the other hand extends to the pressure sensor 10. Thus, the pressure sensor of the currently prevailing water pressure of the wastewater acted upon and in turn directs corresponding signals to the electrical Control parts 9 in the engine compartment. 6

Der beispielsweise Aufbau und Verlauf des als umfangsmäßiger Ringspalt ausgebideteten Einlaufkanales 11 und des sich daran anschließenden Verbindungskanales 12 können am besten aus den Fig. 2 und 3 ersehen werden. Der Ringspalt 11, der vorzugsweise in axialer Erstreckung vorteilhaft um den gesamten äußeren Umfang der vorderen Endwand 5 des Motorgehäuses 3 verläuft, ist durch die äußere, beispielsweise zylindrische Umfangsfläche 5a der Umfangswand 5 und im gezeigten Beispiel durch den in Richtung der Pumpe 2 axial vorstehenden Abschnitt 4a der Umfangswand 4 des Motorgehäuses 3 ausgebildet. Die Weite des Ringspaltes 11 beträgt etwa 1,5 bis 4,0mm, vorteilhaft etwa 2,0 bis 3,0 mm. Wie aus den Fig. 1, 2 und 3 ersichtlich ist, ist der Ringspalt 11 mit seinem ringförmigen Eintrittsbereich 11a zur Umgebung des Antriebsmotors offen. Alternativ kann sich der umfangsmäßige Ringspalt auch in radialer Richtung erstrecken oder einen radialen ringförmigen Eintrittsbereich aufweisen. Hierzu weisen dann die Umfangswand 4 und die Endwand 5 des Motors 1 radial verlaufende Endabschnitte auf bzw. sind dementsprechend ausgebildet (nicht gezeigt). Anstelle des beschriebenen Ringspaltes mit relativ großer Tiefe als Einlaufkanal kann auch ein Einlaufnutensystem vorgesehen sein, das in den Verbindungskanal 12 einmündet, der als Bohrung durch die vordere Endwand 5 hindurch zu dem inneren Raum 6 des Motors 1 verläuft. Ein solches Nutensystem umfasst z. B. eine gemeinsame bogenförmige oder ringförmige Eintrittsnut geringer Tiefe, die in der Umfangswand 4 oder in der Endwand 5 oder in diesen beiden Wänden teilweise ausgebildet ist, und mehrere, von ihr ausgehende und zu dem Verbindungskanal 12 verlaufende Zulaufnuten (nicht gezeigt). Die Weite der Eintrittsnut wird wie die Weite des Ringspaltes gewählt. The example structure and course of the circumferential annular gap gebideteten inlet channel 11 and the adjoining Connection channels 12 can best be seen in FIGS. 2 and 3 be seen. The annular gap 11, preferably in the axial extension advantageous around the entire outer circumference of the front End wall 5 of the motor housing 3 extends, is through the outer, for example cylindrical peripheral surface 5a of the peripheral wall 5 and in Example shown by the axially projecting in the direction of the pump 2 Section 4a of the peripheral wall 4 of the motor housing 3 is formed. The width of the annular gap 11 is about 1.5 to 4.0 mm, advantageous about 2.0 to 3.0 mm. As is apparent from Figs. 1, 2 and 3, is the Annular gap 11 with its annular inlet region 11a to the environment the drive motor open. Alternatively, the circumferential Ring gap also extend in the radial direction or a radial have annular inlet area. For this purpose then have the peripheral wall 4 and the end wall 5 of the engine 1 radially extending end portions on or are formed accordingly (not shown). Instead of the described annular gap with a relatively large depth as an inlet channel can also be provided an inlet groove system, which in the Connecting channel 12 opens, as a hole through the front End wall 5 passes through to the inner space 6 of the engine 1. One Such groove system includes z. B. a common arcuate or annular entrance groove shallow depth, in the peripheral wall 4 or in the end wall 5 or partially formed in these two walls, and a plurality of outgoing and to the connection channel 12th extending feed grooves (not shown). The width of the entrance groove becomes chosen as the width of the annular gap.

Der in dem Raum 6 befindliche Drucksensor 10 weist ein starres Gehäuse 13 auf, das mit einem Fortsatz 14 versehen ist, der einen Anschlusskanal 15 aufweist. Der Fortsatz 14 ragt in den Verbindungskanal 12 hinein, so dass der Drucksensor 10 über den Anschlusskanal 15 aus dem Verbindungskanal 12 beaufschlagt wird. Im gezeigten Fall ist der Statorträger 7 mit einem vorderen Endflansch 7a verbunden, der seinerseits mit der vorderen Endwand 5 des Motorgehäuses 3 fest verbunden ist. In diesem Fall ist der Endflansch 7a mit einem Durchgang 16 versehen, der einen Verlängerungsabschnitt des Verbindungskanales 12 bildet. Wenn ein Endflansch 7a nicht vorgesehen ist, ist es auch möglich, den Drucksensor 10 unmittelbar an der vorderen Endwand 5 zu befestigen. Das Gehäuse 13 des Drucksensors ist mit zwei Durchgangslöchern 17 und 18 vesehen, durch welche Schrauben (nicht gezeigt) verlaufen, mit welchen der Drucksensor an dem Endflansch 7a und/oder an der vorderen Endwand 5 verschraubt wird. Der Fortsatz 14 des Gehäuses 13 ist mit einer vorderen Ringnut 19 versehen, in welche ein elastischer Dichtungsring 20 eingelegt wird, um den Verbindungskanal 12 gegenüber dem inneren Raum 9 des Motorgehäuses 3 abzudichten. Der Drucksensor 10 ist innerhalb des Raumes 6 mittels einer kurzen elektrischen Leitung 21 an die ebenfalls im Raum 6 befindlichen elektrischen Steuerteile 9 des Antriebsmotors 1 angeschlossen.The pressure sensor 10 located in the space 6 has a rigid housing 13, which is provided with an extension 14, which has a connection channel 15 has. The extension 14 protrudes into the connecting channel 12, so that the pressure sensor 10 via the connection channel 15 from the connecting channel 12 is applied. In the case shown, the stator carrier 7 connected to a front end flange 7a, which in turn with the front end wall 5 of the motor housing 3 is firmly connected. In this Case, the end flange 7a is provided with a passage 16 having a Extension portion of the connecting channel 12 forms. When a End flange 7a is not provided, it is also possible, the pressure sensor 10 to attach directly to the front end wall 5. The housing 13 of the pressure sensor is seen with two through holes 17 and 18, through which screws (not shown) run, with which the Pressure sensor on the end flange 7a and / or on the front end wall 5 is screwed. The extension 14 of the housing 13 is provided with a front Ring groove 19 provided, in which an elastic sealing ring 20th is inserted to the connecting channel 12 relative to the inner To seal space 9 of the motor housing 3. The pressure sensor 10 is within of the room 6 by means of a short electrical line 21 to the also located in the room 6 electrical control parts 9 of the drive motor 1 connected.

Der vorteilhaft in Form zweier sich treffender Bohrungen ausgebildete Verbindungskanal 12 hat einen Durchmesser, der größer ist als die Weite des Einlaufkanales 11 in Form des Ringspaltes. Vorteilhaft beträgt der Durchmesser des Verbindungkanals 4,0 bis 8,0 mm.The advantageous in the form of two apt holes trained Connecting channel 12 has a diameter that is greater than the width the inlet channel 11 in the form of the annular gap. The advantage is the Diameter of the connection channel 4.0 to 8.0 mm.

Gemäß Fig. 3 kann in der äußeren Fläche 5a der vorderen Umfangswand 5 des Motorgehäuses 3, welche Fläche dem vorstehenden Abschnitt 4a der Umfangswand 4 des Motorgehäuses 3 gegenüber liegt, eine sich wenigstens teilweise um die Fläche 5a erstreckende Zuströmrille 22 vorgesehen sein, die über eine nutförmige Querverbindung 23 in den Verbindungskanal 12 einmündet. Vorteilhaft ist diese Zuströmrille 22 nahe des Eintrittsbereiches 11a des ringspaltförmigen Einlaufkanales 11 vorgesehen.As shown in FIG. 3, in the outer surface 5a of the front peripheral wall 5 of the motor housing 3, which surface the projecting portion 4a of the peripheral wall 4 of the motor housing 3 is opposite, an inflow groove extending at least partially around the surface 5a 22 may be provided, which via a groove-shaped cross-connection 23 in the connecting channel 12 opens. This inflow groove 22 is advantageous near the inlet region 11 a of the annular gap-shaped inlet channel 11 intended.

Claims (9)

Elektrischer Antriebsmotor für eine in Abwasser eintauchbare Kreiselpumpe, wobei der Antriebsmotor ein Motorgehäuse mit einer Umfangswand und mit einer vorderen, mit der Kreiselpumpe verbindbaren Endwand aufweist und wobei dem Antriebsmotor ein von dem Abwasser beaufschlagbarer Drucksensor zum Ein- und Ausschalten des Antriebsmotors zugeordnet ist, dadurch gekennzeichnet, dass der Drucksensor (10) in einem in dem Motorgehäuse (3) vorgesehenen Raum (6) angeordnet ist, dass zwischen der Umfangswand (4, 4a) und einer dieser gegenüberliegenden Fläche (5a) der vorderen Endwand (5) ein zu der Umgebung des Antriebsmotors (1) hin offener Einlaufkanal (11) vorgesehen ist und dass sich an den Einlaufkanal ein Verbindungskanal (12), der wenigstens durch die vordere Endwand (5) hindurch zu dem an diese Endwand angrenzenden Raum (6) verläuft und dort zu dem Drucksensor (10) führt, anschließt.Electric drive motor for a submerged in waste water centrifugal pump, wherein the drive motor has a motor housing with a peripheral wall and with a front, connectable to the centrifugal pump end wall and wherein the drive motor is assigned to a pressure sensor for switching on and off of the drive motor, characterized characterized in that the pressure sensor (10) is arranged in a space (6) provided in the motor housing (3), that between the peripheral wall (4, 4a) and an opposite surface (5a) of the front end wall (5) to the environment of the drive motor (1) open inlet channel (11) is provided and that at the inlet channel, a connecting channel (12) which extends at least through the front end wall (5) through to the end wall adjacent to this space (6) and there to the Pressure sensor (10) leads, connects. Antriebsmotor nach Anspruch 1, dadurch gekennzeichnet, dass der Einlaufkanal (11) als Ringspalt zwischen der Umfangswand (4, 4a) des Motorgehäuses (3) und der dieser Wand gegenüberliegenden Fläche (5a) der vorderen Endwand (5) des Motorgehäuses (3) ausgebildet ist.Drive motor according to claim 1, characterized in that the inlet channel (11) as an annular gap between the peripheral wall (4, 4a) of the motor housing (3) and the opposite surface of this wall (5a) of the front end wall (5) of the motor housing (3) is. Antriebsmotor nach Anspruch 2, dadurch gekennzeichnet, dass die Weite des Ringspaltes (11) kleiner ist als der Durchmesser des Verbindungskanales (12).Drive motor according to claim 2, characterized in that the width of the annular gap (11) is smaller than the diameter of the connecting channel (12). Antriebsmotor nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass in der der Umfangswand (4, 4a) gegenüberliegenden Fläche (5a) der vorderen Endwand (5) des Motorgehäuses (3) eine sich wenigstens teilweise um die gegenüberliegende Fläche (5a) erstreckende und in den Verbindungskanal (12) einmündende Zuströmrille (22) vorgesehen ist.Drive motor according to claim 2 or 3, characterized in that in the peripheral wall (4, 4a) opposite surface (5a) of the front end wall (5) of the motor housing (3) extending at least partially around the opposite surface (5a) and in the connecting channel (12) opening inflow groove (22) is provided. Antriebsmotor in Ansprucn 4, dadurch gekennzeichnet, dass die Zuströmrille (22) nahe des Eintrittsbereiches (11a), des Ringspaltes (11) vorgesehen ist.Drive motor in Ansprucn 4, characterized in that the inflow groove (22) near the inlet region (11a), the annular gap (11) is provided. Antriebsmotor nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Drucksensor (10) ein Gehäuse (13) aufweist, das mit einem in den Verbindungskanal (12) hineinragenden Fortsatz (14) mit einem Anschlusskanal (15) versehen ist.Drive motor according to one of claims 1 to 5, characterized in that the pressure sensor (10) has a housing (13) which is provided with a projection (14) projecting into the connecting channel (12) with a connection channel (15). Antriebsmotor nach einem der Ansprüche 1 bis 6, dadurch gekennzeichent, dass in dem Motorgehäuse (3) ein Statorträger (7) vorgesehen ist, dass der vorerwähnte Raum (6) als Ringraum zwischen dem Statorträger (7) und der Umfangswand (4) des Motorgehäuses (3) ausgebildet ist und dass der Drucksensor (10) im Bereich der vorderen Endwand (5) des Motorgehäuses (4) montiert und an eine in dem Raum (6) des Motorgehäuses (3) vorgesehene Steuerelektronik (9) zum Ein- und Ausschalten des Antriebsmotors (1) angeschlossen ist.Drive motor according to one of claims 1 to 6, characterized characterized in that in the motor housing (3) a stator support (7) is provided that the aforementioned space (6) as an annular space between the stator carrier (7) and the peripheral wall (4) of the motor housing (3) is formed and that the pressure sensor (10) in the region of the front End wall (5) of the motor housing (4) mounted and to one in the room (6) of the motor housing (3) provided control electronics (9) for on and Turning off the drive motor (1) is connected. Antriebsmotor nach Anspruch 7, dadurch gekennzeichnet, dass der Statorträger (7) einen mit der vorderen Endwand (5) des Antriebsmotors (1) verbundenen Endflansch (7a) aufweist und dass der Drucksensor (10) an dem Endflansch (7a) montiert ist, der einen Durchgang (16) als Verlängerungsabschnitt des Verbindungskanales (12) aufweist. Drive motor according to claim 7, characterized in that the stator support (7) has an end flange (7a) connected to the front end wall (5) of the drive motor (1) and that the pressure sensor (10) is mounted on the end flange (7a) a passage (16) as an extension portion of the connecting channel (12). Antriebsmotor nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die gegenüberliegende Fläche (5a) der vorerwähnten Endwand (5) des Motorgehäuses (3) als zylindrische Umfangsfläche ausgebildet ist, die von einem axialen Endabschnitt (4a) der Umfangswand (4) des Motorgehäuses (3) im Abstand der Weite des Ringspaltes (11) überlappt ist.Drive motor according to one of claims 1 to 8, characterized in that the opposite surface (5a) of the aforesaid end wall (5) of the motor housing (3) is formed as a cylindrical peripheral surface of an axial end portion (4a) of the peripheral wall (4) of the Motor housing (3) at the distance of the width of the annular gap (11) is overlapped.
EP02018885A 2001-08-31 2002-08-24 Pump pressure sensor Expired - Lifetime EP1288501B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10142750 2001-08-31
DE10142750A DE10142750A1 (en) 2001-08-31 2001-08-31 Electric drive motor for a centrifugal pump immersed in waste water

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EP1288501A2 true EP1288501A2 (en) 2003-03-05
EP1288501A3 EP1288501A3 (en) 2004-01-21
EP1288501B1 EP1288501B1 (en) 2007-04-18

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EP02018885A Expired - Lifetime EP1288501B1 (en) 2001-08-31 2002-08-24 Pump pressure sensor

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AT (1) ATE360147T1 (en)
DE (2) DE10142750A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005154A1 (en) * 2009-01-15 2010-07-22 Wilo Se Device for connecting an electromotive drive unit with a pump unit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015010728A1 (en) * 2015-08-17 2017-02-23 Thomas Magnete Gmbh A motor pump assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804516A (en) * 1954-02-25 1957-08-27 Gen Electric Sump pump liquid level control switch
US2969740A (en) * 1957-05-27 1961-01-31 American Crucible Products Com Pump control
EP0511352A1 (en) * 1990-11-15 1992-11-04 Fico Transpar, S.A. Pump for windshield washer provided with level sensing device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2804516A (en) * 1954-02-25 1957-08-27 Gen Electric Sump pump liquid level control switch
US2969740A (en) * 1957-05-27 1961-01-31 American Crucible Products Com Pump control
EP0511352A1 (en) * 1990-11-15 1992-11-04 Fico Transpar, S.A. Pump for windshield washer provided with level sensing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009005154A1 (en) * 2009-01-15 2010-07-22 Wilo Se Device for connecting an electromotive drive unit with a pump unit

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EP1288501A3 (en) 2004-01-21
DE10142750A1 (en) 2003-04-03
DE50209958D1 (en) 2007-05-31
ATE360147T1 (en) 2007-05-15
EP1288501B1 (en) 2007-04-18

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