EP0605771B1 - Device for switching on and off a submersible motorpump - Google Patents

Device for switching on and off a submersible motorpump Download PDF

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Publication number
EP0605771B1
EP0605771B1 EP93118187A EP93118187A EP0605771B1 EP 0605771 B1 EP0605771 B1 EP 0605771B1 EP 93118187 A EP93118187 A EP 93118187A EP 93118187 A EP93118187 A EP 93118187A EP 0605771 B1 EP0605771 B1 EP 0605771B1
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EP
European Patent Office
Prior art keywords
switching
pressure
pump
level
submersible
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
Application number
EP93118187A
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German (de)
French (fr)
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EP0605771A1 (en
Inventor
Werner Arnswald
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Wilo GmbH
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Wilo GmbH
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Publication date
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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
    • F04D13/08—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
    • 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
    • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply

Definitions

  • the invention relates to a device for switching a submersible pump on and off by a pressure sensor which measures the level of the liquid in the chamber surrounding the submersible pump by the liquid pressure in the chamber and which is fastened in or on the outside of the motor or pump housing.
  • a pressure sensor is known from US 41 41 025, which uses the different pressure sensitivity of two semiconducting materials.
  • the two semiconductor layers are alternately sandwiched one on top of the other.
  • the disadvantage of this sensor is the high design effort and the associated costs.
  • the object of the invention is to improve a device of the type mentioned in such a way that it has high accuracy and small dimensions with great immunity to interference and simple construction.
  • the pressure sensor has a pressure-sensitive ohmic resistor and that the resistor has a conductor network with two equally spaced non-contacting conductors, the distance of which is bridged by semiconductor polymer film, which reduces the resistance when pressure is applied in the normal direction .
  • the sensor of the device is a pressure-sensitive resistor of a few square centimeters in size can be attached to the pump exterior as a component that is not susceptible to faults, for example by gluing. Since it is an ohmic resistor, the two electrical outgoing lines do not require a sheath, as is common for protection against electrical and magnetic interference in electronic components.
  • This switchgear has two knobs, one of which can be used to change the distance between the switch-on and switch-off levels, and the second can be used to move a fixed distance between the two levels together.
  • the transducer is neither susceptible to electrical and magnetic interference, nor to contamination, nor to additives and foam in the wastewater, allows the level to be changed remotely and thus the pumps to be switched on and off.
  • the switching levels customary for submersible pumps can be recorded and processed as a signal: switch-on level, switch-off level and alarm level. If there are other levels to be measured, these can also be measured using the sensor attached to the outside of the pump. The total cost is exceptionally low.
  • the resistor has a conductor network with two conductors which are guided at the same distance from one another and are not touching, the spacing of which is bridged by a semiconductor polymer film which reduces the resistance when the pressure is applied in the normal direction.
  • a structurally simple electrical connection is then reached when the two cables of the resistor are led into the interior of the pump or motor housing and run from there through a cable, in particular the motor connection cable to a switching device.
  • the switching device should have two controllers, the first of which determines the switch-on and switch-off level and the second shifts the switch-on and switch-off level at a constant distance, so that particularly simple regulation or control can be achieved.
  • An embodiment of the invention is shown in a side view.
  • the pump has a pump housing 1 that forms a pump chamber in which a rotor runs.
  • the rotor is driven by an electric motor 2, the motor housing 3 of which is attached to the pump housing.
  • the housing and the interior are sealed against the ingress of liquid and in particular the cables 4 emerging at the top of the rotor are also provided with seals.
  • a pressure sensor 5 is fastened to the outside of the motor housing 3, in particular by gluing.
  • the two electrical lines of the pressure sensor 5 lead into the interior of the motor housing 3 and from there into the cable 4 to an externally arranged switching device 6 which has two rotary knobs 7, 8.
  • the distance between the switch-on and switch-off levels can be changed by means of the rotary knob 7 and the distance between the two levels is shifted by the rotary knob 8.
  • another type of adjustment in particular push buttons, can also be provided.
  • the pressure sensor 5 is a membrane switch with two Polymer films. A conductive pattern in the form of interlocking electrodes is applied to one of the two polymer films. A semiconductor polymer is applied to this conductor pattern. If pressure is applied to this sensor in the normal direction, the resistance decreases so that the distance between the two conductors becomes more permeable to current.
  • the two conductor networks which do not touch one another can intermesh like a comb, so that there is a relatively large distance range between the two conductors, i.e. with a constant distance, the distance range is relatively long.

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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)
  • Motor Or Generator Frames (AREA)
  • Measuring Fluid Pressure (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Ein- und Ausschalten einer Tauchmotorpumpe durch einen Drucksensor, der die Höhe des Flüssigkeitsstandes in der die Tauchmotorpumpe umgebenden Kammer durch den Flüssigkeitsdruck in der Kammer mißt und der in oder an der Außenseite des Motor- oder Pumpengehäuse befestigt ist.The invention relates to a device for switching a submersible pump on and off by a pressure sensor which measures the level of the liquid in the chamber surrounding the submersible pump by the liquid pressure in the chamber and which is fastened in or on the outside of the motor or pump housing.

Es ist bekannt, Wasserstände mit Hilfe von Schwimmerschaltern, durch Ultraschall, durch Elektroden oder durch Druckwächter zu erfassen, und die Pumpe entsprechend ein- und auszuschalten. Diese bekannten Vorrichtungen besitzen jeweils mindestens zwei der folgenden Probleme: Nichteinstellbarkeit, Ungenauigkeit, hoher Konstruktionsaufwand, hohe Kosten, technische Kompliziertheit, hohe Störanfälligkeit. Die Störanfälligkeit beruht bei Schwimmerschaltern darauf, daß sich Feststoffe auf ihnen ablagern können, bei Elektroden auf Verschmutzung, bei Ultraschall auf Störung des Echos durch Schaum auf der Wasseroberfläche und bei Druckwächtern durch Anfälligkeit der mechanischen Apparatur.It is known to detect water levels with the aid of float switches, by ultrasound, by electrodes or by pressure switches, and to switch the pump on and off accordingly. These known devices each have at least two of the following problems: non-adjustability, inaccuracy, high construction costs, high costs, technical complexity, high susceptibility to failure. The susceptibility to faults in float switches is based on the fact that solids can deposit on them, on electrodes on dirt, on ultrasound on disturbance of the echo due to foam on the water surface and, in the case of pressure switches, due to the vulnerability of the mechanical equipment.

Aus US 49 92 030 ist eine Tauchpumpe mit einem Druckschalter bekannt, der das Vorhandensein bzw. Nichtvorhandensein einer Flüssigkeit aufgrund einer Änderung der mechanischen Beanspruchung auf ein Bauteil feststellt. Diese Art von Druckwächter hat ebenfalls den Nachteil der Nichteinstellbarkeit und der Ungenauigkeit.From US 49 92 030 a submersible pump with a pressure switch is known which determines the presence or absence of a liquid due to a change in the mechanical stress on a component. This type of pressure switch also has the disadvantage of being non-adjustable and inaccurate.

Aus US 41 41 025 ist ein Drucksensor bekannt, der die unterschiedliche Druckempfindlichkeit zweier halbleitender Materialien ausnutzt. Bei diesem Drucksensor werden abwechselnd die zwei Halbleiterschichten sandwichartig übereinander gelegt. Der Nachteil dieses Sensors ist der hohe konstruktive Aufwand und die damit verbundenen Kosten.A pressure sensor is known from US 41 41 025, which uses the different pressure sensitivity of two semiconducting materials. In this pressure sensor, the two semiconductor layers are alternately sandwiched one on top of the other. The disadvantage of this sensor is the high design effort and the associated costs.

Aufgabe der Erfindung ist es, eine Vorrichtung der eingangs genannten Art so zu verbessern, daß sie bei großer Störungsunempfindlichkeit und einfacher Konstruktion eine hohe Genauigkeit und geringe Abmessungen aufweist.The object of the invention is to improve a device of the type mentioned in such a way that it has high accuracy and small dimensions with great immunity to interference and simple construction.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Drucksensor einen druckempfindlichen ohmschen Widerstand aufweist und daß der Widerstand ein Leiternetz aufweist mit zwei in gleichem Abstand nebeneinander geführten sich nicht berührenden Leitern, deren Abstand durch Halbleiterpolymerfolie überbrückt ist, die bei in Normalrichtung aufgebrachten Druck den Widerstand verringert.This object is achieved in that the pressure sensor has a pressure-sensitive ohmic resistor and that the resistor has a conductor network with two equally spaced non-contacting conductors, the distance of which is bridged by semiconductor polymer film, which reduces the resistance when pressure is applied in the normal direction .

Der Sensor der Vorrichtung ist ein druckempfindlicher Widerstand von wenigen Quadratzentimetern Baugröße, der als störunanfälliges Bauteil am Pumpenäußeren befestigt werden kann, z.B. durch Aufkleben. Da es sich um einen ohmschen Widerstand handelt, benötigen die zwei elektrischen abgehenden Leitungen keine Ummantelung, wie sie beim Schutz gegen elektrische und magnetische Störungen bei elektronischen Bauelementen üblich sind.The sensor of the device is a pressure-sensitive resistor of a few square centimeters in size can be attached to the pump exterior as a component that is not susceptible to faults, for example by gluing. Since it is an ohmic resistor, the two electrical outgoing lines do not require a sheath, as is common for protection against electrical and magnetic interference in electronic components.

Die zwei Leiter des Sensors führen in das Motorinnere und von dort durch das Motorkabel zum Schaltgerät. Dieses Schaltgerät besitzt zwei Drehknöpfe, wobei mit Hilfe des einen der Abstand zwischen Ein- und Ausschaltpegel verändert werden kann und wobei mit Hilfe des zweiten ein fester Abstand zwischen beiden Niveaus zusammen verschoben wird.The two conductors of the sensor lead into the interior of the motor and from there through the motor cable to the switchgear. This switchgear has two knobs, one of which can be used to change the distance between the switch-on and switch-off levels, and the second can be used to move a fixed distance between the two levels together.

Der Aufnehmer ist weder anfällig gegen elektrische und magnetische Störungen, noch gegen Verschmutzung, auch nicht gegen Zusätze und Schaum im Abwasser, erlaubt eine ferngesteuerte Niveauänderung und damit das Ein- und Ausschalten der Pumpen. Mit ein- und demselben Aufnehmer können die bei Tauchmotorpumpen üblichen Schaltniveaus erfaßt und als Signal verarbeitet werden: Einschaltniveau, Ausschaltniveau und Alarmniveau. Sollten weitere Niveaus zu messen sein, dann können auch diese über den Meßaufnehmer, der außen an der Pumpe angebracht ist, erfaßt werden. Die Gesamtkosten sind außergewöhnlich niedrig.The transducer is neither susceptible to electrical and magnetic interference, nor to contamination, nor to additives and foam in the wastewater, allows the level to be changed remotely and thus the pumps to be switched on and off. With one and the same transducer, the switching levels customary for submersible pumps can be recorded and processed as a signal: switch-on level, switch-off level and alarm level. If there are other levels to be measured, these can also be measured using the sensor attached to the outside of the pump. The total cost is exceptionally low.

Besonders vorteilhaft ist es hierbei, wenn der Widerstand ein Leiternetz aufweist mit zwei in gleichem Abstand nebeneinander geführten, sich nicht berührenden Leitern, deren Abstand durch eine Halbleiterpolymerfolie überbrückt ist, die bei in Normalrichtung aufgebrachtem Druck den Widerstand verringert.It is particularly advantageous in this case if the resistor has a conductor network with two conductors which are guided at the same distance from one another and are not touching, the spacing of which is bridged by a semiconductor polymer film which reduces the resistance when the pressure is applied in the normal direction.

Eine konstruktiv einfache elektrische Anbindung wird dann erreicht, wenn die zwei Kabel des Widerstands in das Innere des Pumpen- oder Motorengehäuses geführt sind und von dort durch ein Kabel, insbesondere das Motoranschlußkabel zu einem Schaltgerät laufen. Hierbei sollte das Schaltgerät zwei Regler aufweisen, von denen der erste den Ein- und Ausschaltpegel bestimmt und der zweite den Ein- und Ausschaltpegel in einem gleichbleibendem Abstand verschiebt, so daß eine besonders einfache Regelung bzw. Steuerung erreichbar ist.A structurally simple electrical connection is then reached when the two cables of the resistor are led into the interior of the pump or motor housing and run from there through a cable, in particular the motor connection cable to a switching device. Here, the switching device should have two controllers, the first of which determines the switch-on and switch-off level and the second shifts the switch-on and switch-off level at a constant distance, so that particularly simple regulation or control can be achieved.

Ein Ausführungsbeispiel der Erfindung ist in einer Seitenansicht dargestellt.An embodiment of the invention is shown in a side view.

Die Pumpe weist ein Pumpengehäuse 1 auf, daß eine Pumpenkammer bildet, in der ein Rotor läuft. Der Rotor ist durch einen Elektromotor 2 angetrieben, dessen Motorgehäuse 3 am Pumpengehäuse befestigt ist. Um die Pumpe als Tauchmotorpumpe einsetzen zu können, sind die Gehäuse und das Innere gegen eindringende Flüssigkeit abgedichtet und insbesondere sind auch die oben am Rotor austretenden Kabel 4 mit Abdichtungen versehen.The pump has a pump housing 1 that forms a pump chamber in which a rotor runs. The rotor is driven by an electric motor 2, the motor housing 3 of which is attached to the pump housing. In order to be able to use the pump as a submersible motor pump, the housing and the interior are sealed against the ingress of liquid and in particular the cables 4 emerging at the top of the rotor are also provided with seals.

An der Außenseite des Motorengehäuses 3 ist ein Drucksensor 5 befestigt insbesondere durch Aufkleben. Die zwei elektrischen Leitungen des Drucksensors 5 führen in das Innere des Motorengehäuses 3 und von dort in das Kabel 4 zu einem außen angeordnetem Schaltgerät 6, das zwei Drehknöpfe 7, 8 aufweist. Durch den Drehknopf 7 ist der Abstand zwischen Ein- und Ausschaltpegel veränderbar und durch den Drehknopf 8 wird der Abstand zwischen beiden Niveaus verschoben. Statt der Drehknöpfe kann auch eine andere Verstellart, insbesondere Drucktasten vorgesehen sein.A pressure sensor 5 is fastened to the outside of the motor housing 3, in particular by gluing. The two electrical lines of the pressure sensor 5 lead into the interior of the motor housing 3 and from there into the cable 4 to an externally arranged switching device 6 which has two rotary knobs 7, 8. The distance between the switch-on and switch-off levels can be changed by means of the rotary knob 7 and the distance between the two levels is shifted by the rotary knob 8. Instead of the knobs, another type of adjustment, in particular push buttons, can also be provided.

Der Drucksensor 5 ist ein Folienschalter mit zwei Polymerfilmen. Auf einem der beiden Polymerfilme ist ein Leiterbild in Form ineinandergreifender Elektroden aufgetragen. Auf dieses Leiterbild ist ein Halbleiterpolymer aufgebracht. Wird auf diesem Sensor in Normalrichtung Druck aufgebracht, so nimmt der Widerstand ab, so daß der Abstand zwischen den beiden Leitern stromdurchlässiger wird.The pressure sensor 5 is a membrane switch with two Polymer films. A conductive pattern in the form of interlocking electrodes is applied to one of the two polymer films. A semiconductor polymer is applied to this conductor pattern. If pressure is applied to this sensor in the normal direction, the resistance decreases so that the distance between the two conductors becomes more permeable to current.

Die beiden einander nicht berührenden Leiternetze können kammartig ineinandergreifen, so daß ein verhältnismäßig großer Abstandsbereich zwischen den zwei Leitern besteht, d.h. bei gleichbleibendem Abstand ist der Abstandsbereich verhältnismäßig lang.The two conductor networks which do not touch one another can intermesh like a comb, so that there is a relatively large distance range between the two conductors, i.e. with a constant distance, the distance range is relatively long.

Claims (3)

  1. A device for the switching on and off of a submersible motordriven pump by a pressure sensor (5), which measures the level of the liquid in the chamber enclosing the submersible motor-driven pump by the liquid pressure in the chamber and is attached in or on the outside of the motor casing or pump casing, characterized in that the pressure sensor (5) has a pressure-sensitive ohmic resistance and the resistance has a conductor network having two conductors which extend contact-free at an equal distance apart one beside the other and whose distance apart is bridged by semiconductor polymer foil which reduces the resistance when pressure is applied in the normal direction.
  2. A device according to claim 1, characterized in that the two cables of the resistor extend into the inside of the pump casing or motor casing (3) and from thence run through a cable (4), more particularly the motor connecting cable to switchgear (6).
  3. A device according to claims 1 or 2, characterized in that the switchgear (6) has two controllers (7, 8), of which the first (7) determines the switching-on and switching-off level, and the second (8) shifts the switching-on and switching-off level at a constant distance.
EP93118187A 1992-12-30 1993-11-10 Device for switching on and off a submersible motorpump Expired - Lifetime EP0605771B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4244417 1992-12-30
DE4244417A DE4244417A1 (en) 1992-12-30 1992-12-30 Device for switching a submersible pump on and off

Publications (2)

Publication Number Publication Date
EP0605771A1 EP0605771A1 (en) 1994-07-13
EP0605771B1 true EP0605771B1 (en) 1996-03-27

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EP93118187A Expired - Lifetime EP0605771B1 (en) 1992-12-30 1993-11-10 Device for switching on and off a submersible motorpump

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US (1) US5466127A (en)
EP (1) EP0605771B1 (en)
DE (2) DE4244417A1 (en)
ES (1) ES2085095T3 (en)

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Publication number Publication date
US5466127A (en) 1995-11-14
EP0605771A1 (en) 1994-07-13
DE4244417A1 (en) 1994-07-07
DE59302051D1 (en) 1996-05-02
ES2085095T3 (en) 1996-05-16

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