EP1288501B1 - Pump pressure sensor - Google Patents

Pump pressure sensor Download PDF

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Publication number
EP1288501B1
EP1288501B1 EP02018885A EP02018885A EP1288501B1 EP 1288501 B1 EP1288501 B1 EP 1288501B1 EP 02018885 A EP02018885 A EP 02018885A EP 02018885 A EP02018885 A EP 02018885A EP 1288501 B1 EP1288501 B1 EP 1288501B1
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EP
European Patent Office
Prior art keywords
drive motor
pressure sensor
motor housing
end wall
wall
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Expired - Lifetime
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EP02018885A
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German (de)
French (fr)
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EP1288501A3 (en
EP1288501A2 (en
Inventor
John Olsen
Tom Jaeger
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Grundfos AS
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Grundfos AS
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Publication of EP1288501A3 publication Critical patent/EP1288501A3/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/02—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 relates to an electric drive motor for a submerged in wastewater 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, 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 passes a signal via a cable to an electrical switching unit, which turns 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 of the centrifugal pump is immersed in the wastewater 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 centrifugal pump and the drive motor formed aggregates 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.
  • US Pat. No. 2,804,516 A and US Pat. No. 2,969,740 A disclose fluid pumps which have a pressure sensor arranged in the pump housing. With sufficient fluid level here is a pressurization of the pressure sensor with the liquid surrounding the pump via narrow, tubular inlet channels formed. Due to the narrow configuration of the inlet channels, even relatively small solid particles floating in the liquid can clog the inlet channels and thus at least impair the function of the controls and thus of the pump and prevent it at worst.
  • the object of the invention is to improve an electric drive motor of the initially mentioned type, in which the pressure sensor is arranged quickly and inexpensively mounted and damage-resistant and reliable.
  • the inventive arrangement of the pressure sensor ie by its arrangement within the housing of the electric drive motor, the pressure sensor is arranged protected, so that it can not be damaged especially during maintenance of the motor pump unit in the well and maintenance of the well inside and so far functionally reliable is. Furthermore, the pressure sensor is easy and quick and inexpensive mountable during engine production, especially the cable to which the pressure sensor otherwise suspended, now omitted.
  • the internal arrangement of the pressure sensor in the motor housing eliminates protection means, for example in the form of a protective jacket, which avoid that the pressure sensor is exposed to the damaging effects of aggressive wastewater.
  • Another important advantage is that, in a space-saving manner, an extremely large inlet cross-section is created for the introduction of the water pressure into the connecting channel for acting on the pressure sensor connected thereto with the respective prevailing water pressure. As a result, there is virtually 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.
  • the inventive design of the inlet channel as an annular gap between the peripheral wall of the motor housing and the opposite wall of this wall surface of the front end wall of the motor housing ensures that the inlet channel is a very large inlet cross-section, which can extend at most around the circumference of the engine is available, so that a relatively large amount of solids in the wastewater does not lead to a function-obstructing blockage of the inlet channel, because there is still sufficient free inlet cross-section available.
  • the width of the annular gap is smaller than the depth of the adjoining and leading to the pressure sensor connection channel.
  • Fig. 1 shows a motor pump unit for removing waste water, which have collected in a conventional manner in a well or reservoir.
  • This unit consists of an electric drive motor 1 and a centrifugal pump 2. Both parts are held together in the usual manner by means of 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.
  • a space 6 is provided, which is formed for example as an annular space and is located between the peripheral wall 4 and a stator 7, which carries the usual electric stator 8 of the motor 1.
  • the usual electrical terminals and other electrical control parts 9 are provided for switching on and off of the drive motor 1.
  • a pressure sensor 10 is arranged, in the example shown at a front end flange 7a of the stator 7.
  • This pressure sensor is acted upon by the water pressure of the waste water, in which the centrifugal pump is at least partially immersed.
  • an inlet channel 11 is provided, which is formed between the peripheral wall 4 of the motor housing 3 and the front end wall 5 of the motor housing.
  • At the inlet channel 11 is followed by a running through the front end wall connecting channel 12, on the other hand extends to the pressure sensor 10.
  • the pressure sensor is acted upon by the currently prevailing water pressure of the wastewater and in turn directs corresponding signals to the electrical control parts 9 in the engine compartment. 6
  • the annular gap 11 which preferably extends in the axial extent advantageously around the entire outer circumference of the front end wall 5 of the motor housing 3, through the outer, for example, cylindrical peripheral surface 5a of the peripheral wall 5 and in the example shown by the axially projecting in the direction of the pump section 2 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, advantageously about 2.0 to 3.0 mm.
  • the annular gap 11 is open with its annular inlet region 11 a to the surroundings of the drive motor.
  • the circumferential annular gap can also extend in the radial direction or have a radial annular inlet region.
  • the peripheral wall 4 and the end wall 5 of the motor 1 radially extending end portions or are formed accordingly (not shown).
  • an inlet groove system may be provided which opens into the connecting channel 12 which extends as a bore through the front end wall 5 through to the inner space 6 of the engine 1.
  • Such a groove system comprises z. B.
  • a common arcuate or annular inlet groove shallow depth which is partially formed in the peripheral wall 4 or in the end wall 5 or in these two walls, and a plurality of outgoing from her and extending to the connecting channel 12 inlet grooves (not shown).
  • the width of the entrance groove is 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.
  • the extension 14 protrudes into the connection channel 12, so that the pressure sensor 10 is acted upon via the connection channel 15 from the connection channel 12.
  • the stator support 7 is connected to a front end flange 7 a, which in turn is fixedly connected to the front end wall 5 of the motor housing 3.
  • the end flange 7 a is provided with a passage 16 which forms an extension portion of the connection channel 12. If an end flange 7 a is not provided, it is also possible to attach the pressure sensor 10 directly to the front end wall 5.
  • the housing 13 of the pressure sensor is provided with two through holes 17 and 18 through which screws (not shown) extend, with which the pressure sensor is screwed to the end flange 7a and / or to the front end wall 5.
  • the extension 14 of the housing 13 is provided with a front annular groove 19, in which an elastic sealing ring 20 is inserted to seal the connecting channel 12 with respect to the inner space 9 of the motor housing 3.
  • the pressure sensor 10 is connected within the space 6 by means of a short electrical line 21 to the also located in the space 6 electrical control parts 9 of the drive motor 1.
  • the advantageously formed in the form of two holes meeting the connecting channel 12 has a diameter which is greater than the width of the inlet channel 11 in the form of the annular gap.
  • the diameter of the connection channel is 4.0 to 8.0 mm.
  • a Zuströmrille 22 extending at least partially around the surface 5a, which opens into the connecting channel 12 via a groove-shaped cross-connection 23.
  • This inflow groove 22 is advantageously provided near the inlet region 11 a of the annular gap-shaped inlet channel 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Frames (AREA)
  • Measuring Fluid Pressure (AREA)
  • Control Of Non-Positive-Displacement Pumps (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 relates to an electric drive motor for a submerged in wastewater 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, 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 effluents by means of a centrifugal pump, which is driven by an electric drive motor, from a well in which the wastewater has collected, 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 passes a signal via a cable to an electrical switching unit, which turns 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 of the centrifugal pump is immersed in the wastewater 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 centrifugal pump and the drive motor formed aggregates 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.

Aus US 2,804,516 A sowie aus US 2,969,740 A sind Flüssigkeitspumpen bekannt, die einen in dem Pumpengehäuse angeordneten Drucksensor aufweisen. Bei ausreichendem Flüssigkeitsstand erfolgt hier eine Druckbeaufschlagung des Drucksensors mit der die Pumpe umgebenden Flüssigkeit über enge, rohrförmig ausgebildete Einlaufkanäle. Aufgrund der engen Ausgestaltung der Einlaufkanäle können selbst verhältnismäßig kleine in der Flüssigkeit schwimmende Feststoffteilchen die Einlaufkanäle verstopfen und so die Funktion der Steuerungen und damit der Pumpe zumindest beeinträchtigen und ungünstigstenfalls verhindern.US Pat. No. 2,804,516 A and US Pat. No. 2,969,740 A disclose fluid pumps which have a pressure sensor arranged in the pump housing. With sufficient fluid level here is a pressurization of the pressure sensor with the liquid surrounding the pump via narrow, tubular inlet channels formed. Due to the narrow configuration of the inlet channels, even relatively small solid particles floating in the liquid can clog the inlet channels and thus at least impair the function of the controls and thus of the pump and prevent it at worst.

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 electric drive motor of the initially mentioned type, in which the pressure sensor is arranged quickly and inexpensively mounted and damage-resistant and 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 innerhalb 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 Drucksensor 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, ie by its arrangement within the housing of the electric drive motor, the pressure sensor is arranged protected, so that it can not be damaged especially during maintenance of the motor pump unit in the well and maintenance of the well inside and so far functionally reliable is. Furthermore, the pressure sensor is easy and quick and inexpensive mountable during engine production, especially the cable to which the pressure sensor otherwise suspended, now omitted. The internal arrangement of the pressure sensor in the motor housing eliminates protection means, for example in the form of a protective jacket, which avoid that the pressure sensor is exposed to the damaging effects of aggressive wastewater. Another important advantage is that, in a space-saving manner, an extremely large inlet cross-section is created for the introduction of the water pressure into the connecting channel for acting on the pressure sensor connected thereto with the respective prevailing water pressure. As a result, there is virtually 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.

Die erfindungsgemäße Ausgestaltung des Einlaufskanales als Ringspalt zwischen der Umfangswand des Motorgehäuses und der dieser Wand gegenüberliegenden Fläche der vorderen Endwand des Motorgehäuses stellt sicher, 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.The inventive design of the inlet channel as an annular gap between the peripheral wall of the motor housing and the opposite wall of this wall surface of the front end wall of the motor housing ensures that the inlet channel is a very large inlet cross-section, which can extend at most around the circumference of the engine is available, so that a relatively large amount of solids in the wastewater does not lead to a function-obstructing blockage of the inlet channel, because there is still sufficient free inlet cross-section 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 than the depth of the adjoining and leading to the pressure sensor connection channel. As a result, a certain blocking effect is caused for the solid particles penetrating into the annular gap, since these are held in the annular gap and thus can not advance further to the pressure sensor.

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, in the peripheral wall opposite surface of the front end wall of the motor housing, which surface bounds the above-mentioned annular gap on the one side, at least partially extending around this surface and opening into the connecting channel Zuströmrille provided. This ensures that the pressure sensor is still subjected to the pressure of the wastewater quickly and reliably even if the inlet region of the annular gap in the vicinity of the inlet region of the connection channel should be very clogged.

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.Fig. 1 shows a motor pump unit for removing waste water, which have collected in a conventional manner in a well or reservoir. This unit consists of an electric drive motor 1 and a centrifugal pump 2. Both parts are held together in the usual manner by means of 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. In the motor housing 3, a space 6 is provided, which is formed for example as an annular space and is located between the peripheral wall 4 and a stator 7, which carries the usual electric stator 8 of the motor 1. In the room 6, the usual electrical terminals and other electrical control parts 9 are provided for switching on and off of 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 example shown at a front end flange 7a of the stator 7. This pressure sensor is acted upon by the water pressure of the waste water, in which the centrifugal pump is at least partially immersed. For this purpose, an inlet channel 11 is provided, which is formed between the peripheral wall 4 of the motor housing 3 and the front end wall 5 of the motor housing. At the inlet channel 11 is followed by a running through the front end wall connecting channel 12, on the other hand extends to the pressure sensor 10. Thus, the pressure sensor is acted upon by the currently prevailing water pressure of the wastewater 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 11 a 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.For example, the structure and course of the ausgebilschte as circumferential annular gap inlet channel 11 and the adjoining connecting channel 12 can best be seen from FIGS. 2 and 3. The annular gap 11, which preferably extends in the axial extent advantageously around the entire outer circumference of the front end wall 5 of the motor housing 3, through the outer, for example, cylindrical peripheral surface 5a of the peripheral wall 5 and in the example shown by the axially projecting in the direction of the pump section 2 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, advantageously about 2.0 to 3.0 mm. As is apparent from FIGS. 1, 2 and 3, the annular gap 11 is open with its annular inlet region 11 a to the surroundings of the drive motor. Alternatively, the circumferential annular gap can also extend in the radial direction or have a radial annular inlet region. For this purpose, then have the peripheral wall 4 and the end wall 5 of the motor 1 radially extending end portions or are formed accordingly (not shown). Instead of the described annular gap with a relatively large depth as an inlet channel and an inlet groove system may be provided which opens into the connecting channel 12 which extends as a bore through the front end wall 5 through to the inner space 6 of the engine 1. Such a groove system comprises z. B. a common arcuate or annular inlet groove shallow depth, which is partially formed in the peripheral wall 4 or in the end wall 5 or in these two walls, and a plurality of outgoing from her and extending to the connecting channel 12 inlet grooves (not shown). The width of the entrance groove is 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. The extension 14 protrudes into the connection channel 12, so that the pressure sensor 10 is acted upon via the connection channel 15 from the connection channel 12. In the case shown, the stator support 7 is connected to a front end flange 7 a, which in turn is fixedly connected to the front end wall 5 of the motor housing 3. In this case, the end flange 7 a is provided with a passage 16 which forms an extension portion of the connection channel 12. If an end flange 7 a is not provided, it is also possible to attach the pressure sensor 10 directly to the front end wall 5. The housing 13 of the pressure sensor is provided with two through holes 17 and 18 through which screws (not shown) extend, with which the pressure sensor is screwed to the end flange 7a and / or to the front end wall 5. The extension 14 of the housing 13 is provided with a front annular groove 19, in which an elastic sealing ring 20 is inserted to seal the connecting channel 12 with respect to the inner space 9 of the motor housing 3. The pressure sensor 10 is connected within the space 6 by means of a short electrical line 21 to the also located in the space 6 electrical control parts 9 of the drive motor 1.

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 advantageously formed in the form of two holes meeting the connecting channel 12 has a diameter which is greater than the width of the inlet channel 11 in the form of the annular gap. Advantageously, the diameter of the connection channel is 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 11 a des ringspaltförmigen Einlaufkanales 11 vorgesehen.3, in the outer surface 5a of the front peripheral wall 5 of the motor housing 3, which surface is opposed to the protruding portion 4a of the peripheral wall 4 of the motor housing 3, a Zuströmrille 22 extending at least partially around the surface 5a, which opens into the connecting channel 12 via a groove-shaped cross-connection 23. This inflow groove 22 is advantageously provided near the inlet region 11 a of the annular gap-shaped inlet channel 11.

Claims (8)

  1. An electrical drive motor for a centrifugal pump immersible into waste water, wherein the drive motor comprises a motor housing with a peripheral wall and with a front end wall connectable to the centrifugal pump, and wherein a pressure sensor for switching the drive motor on and off and which may be impinged by the waste water is allocated to the drive motor, and is arranged in a space (6) provided in the motor housing (3), wherein a run-in channel (11) which is open towards the surroundings of the drive motor (1) is provided between the peripheral wall (4, 4a) and a surface (5a) of the front end wall (5), said surface (5a) lying opposite said peripheral wall, and wherein a connection channel (12) which runs at least through the front end wall (5) to the space (6) delimiting this end wall, and there leads to the pressure sensor (10), connects to the run-in channel (11), characterised in that the run-in channel (11) is designed as an annular gap between the peripheral wall (4, 4a) of the motor housing (3) and the surface (5a) of the front end wall (5) of the motor housing (3), said surface lying opposite this wall.
  2. A drive motor according to claim 1, characterised in that the width of the annular gap (11) is smaller than the diameter of the connection channel (12).
  3. A drive motor according to claim 1 or 2, characterised in that in the surface (5a) of the front end wall (5) of the motor housing (3), said surface lying opposite the peripheral wall (4, 4a), there is provided an inflow groove (22) which extends at least partly around the oppositely lying surface (5a) and which runs into the connection channel (12).
  4. A drive motor according to claim 3, characterised in that the inflow groove (22) is provided in the vicinity of the entry region (11a) of the annular gap (11).
  5. A drive motor according to one of the claims 1 to 4, characterised in that the pressure sensor (10) comprises a housing (13) which is provided with a continuation (14) with a connection channel (15), said continuation (14) projecting into the connection channel (12).
  6. A drive motor according to one of the claims 1 to 5, characterised in that a stator carrier (7) is provided in the motor housing (3), that the previously mentioned space (6) is designed as an annular space between the stator carrier (7) and the peripheral wall (4) of the motor housing (3), and that the pressure sensor (10) is assembled in the region of the front end wall (5) of the motor housing (3), and is connected to control electronics (9) for switching the drive motor (1) on and off, which are provided in the space (6) of the motor housing (3).
  7. A drive motor according to claim 6, characterised in that the stator carrier (7) comprises an end flange (7a) which is connected to the front end wall (5) of the drive motor (1), and that the pressure sensor (10) is assembled on the end flange (7a) which comprises a passage (16) as an extension section of the connection channel (12).
  8. A drive motor according to one of the claims 1 to 7, characterised in that the oppositely lying surface (5a) of the previously mentioned end wall (5) of the motor housing (3) is designed as a cylindrical peripheral surface, which is overlapped by an axial end section (4a) of the peripheral wall (4) of the motor housing (3) at a distance of the width of the annular gap (11).
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
DE10142750A DE10142750A1 (en) 2001-08-31 2001-08-31 Electric drive motor for a centrifugal pump immersed in waste water
DE10142750 2001-08-31

Publications (3)

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

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ID=7697298

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Application Number Title Priority Date Filing Date
EP02018885A Expired - Lifetime EP1288501B1 (en) 2001-08-31 2002-08-24 Pump pressure sensor

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EP (1) EP1288501B1 (en)
AT (1) ATE360147T1 (en)
DE (2) DE10142750A1 (en)

Families Citing this family (2)

* 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
DE102015010728A1 (en) * 2015-08-17 2017-02-23 Thomas Magnete Gmbh A motor pump assembly

Family Cites Families (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
ES2026412A6 (en) * 1990-11-15 1992-04-16 Transpar Iberica Sa Pump for windshield washer provided with level sensing device.

Also Published As

Publication number Publication date
DE50209958D1 (en) 2007-05-31
EP1288501A3 (en) 2004-01-21
DE10142750A1 (en) 2003-04-03
ATE360147T1 (en) 2007-05-15
EP1288501A2 (en) 2003-03-05

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