DE19534464C1 - Device preventing dryout of electromagnetic oscillating-piston pump - Google Patents

Device preventing dryout of electromagnetic oscillating-piston pump

Info

Publication number
DE19534464C1
DE19534464C1 DE1995134464 DE19534464A DE19534464C1 DE 19534464 C1 DE19534464 C1 DE 19534464C1 DE 1995134464 DE1995134464 DE 1995134464 DE 19534464 A DE19534464 A DE 19534464A DE 19534464 C1 DE19534464 C1 DE 19534464C1
Authority
DE
Germany
Prior art keywords
pump
piston pump
dry
switch
amplifier
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 - Fee Related
Application number
DE1995134464
Other languages
German (de)
Inventor
Dieter Hoehn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rowenta Werke GmbH
Original Assignee
Rowenta Werke GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Rowenta Werke GmbH filed Critical Rowenta Werke GmbH
Priority to DE1995134464 priority Critical patent/DE19534464C1/en
Application granted granted Critical
Publication of DE19534464C1 publication Critical patent/DE19534464C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0827—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors responsive to underload or no-load, e.g. pump-off control circuits for pump motors
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F75/00—Hand irons
    • D06F75/08—Hand irons internally heated by electricity
    • D06F75/10—Hand irons internally heated by electricity with means for supplying steam to the article being ironed
    • D06F75/14—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water in a reservoir carried by the iron
    • D06F75/18—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water in a reservoir carried by the iron the water being fed slowly, e.g. drop by drop, from the reservoir to a steam generator
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F75/00—Hand irons
    • D06F75/08—Hand irons internally heated by electricity
    • D06F75/22—Hand irons internally heated by electricity with means for supplying liquid to the article being ironed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/10—Other safety measures

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The device is based on an electronic control circuit (4) measuring the voltage developed across a shunt (3) by the current drawn by the pump motor (1) from an AC source (2) and rectifier (6) when the switch (5) is closed. An amplifier (4a) is followed by a band-pass filter (4b), peak rectifier (4c) and comparator (4e) with a DC voltage reference supplied from a potentiometer (4d). If the pump runs dry, impact and rebound of its piston induce high-frequency variation of current which is detectable by the amplifier. The comparator causes the switch to be opened as soon as the reference is exceeded.

Description

Die Erfindung betrifft ein Verfahren zur Verhinderung des Trockenlaufens von elektromagnetischen Kolbenpumpen, insbesondere für Dampfbügeleisen nach dem Oberbegriff des Anspruchs 1.The invention relates to a method for preventing dry running of electromagnetic piston pumps, in particular for steam irons according to the preamble of claim 1.

Elektromagnetische Schwingkolbenpumpen, wie sie z. B. in Bügeleisen Verwendung finden, sind nur bedingt trockenlaufgeeignet. Ein Trockenlauf, der über eine sehr begrenzte Zeit hinausgeht, führt zu irreversiblen Schaden an der Kolbenpumpe.Electromagnetic vibrating piston pumps, such as those used for. B. in irons Use are only suitable for dry running to a limited extent. A dry run, that goes beyond a very limited time leads to irreversible Damage to the piston pump.

Um ein Trockenlaufen zu verhindern, ist es bekannt, die angesaugte Wassermenge zu überwachen und bei Unterschreiten eines bestimmten Mindestpegels die Pumpe abzuschalten.In order to prevent dry running, it is known to suck the Monitor water volume and when it falls below a certain level Minimum level to switch off the pump.

Aus der DE 43 36 823 A1 ist eine Vorrichtung zur elektronischen Membranlagenkontrolle bei Membranpumpen bekannt, wobei mit Hilfe eines elektromechanischen oder elektronischen Gebers oder Senders über einen Empfänger und einer damit verbundenen Auswerteeinheit die Lage der Membrane ermittelt und entsprechend den vorgegebenen Parametern ein Zulaufventil gesteuert wird. Hierdurch soll ein Bruch oder vorzeitiger Verschleiß der Membrane vermieden, aber nicht das Trockenlaufen der Pumpe verhindert werden.DE 43 36 823 A1 describes an electronic device Membrane control in diaphragm pumps known, with the help of a electromechanical or electronic encoder or transmitter via one Receiver and an associated evaluation unit the location of the Membrane determined and according to the specified parameters Inlet valve is controlled. This is said to be a break or premature Wear on the diaphragm avoided, but not the pump running dry be prevented.

Die DE 29 25 830 A1 offenbart einen Trockenlaufschutz für Pumpen, wobei mit Hilfe einer in den Flüssigkeitsstrom der Pumpe hineinragenden Elektrode der Widerstand zwischen Pumpengehäuse und Flüssigkeit gemessen wird. Bei einer Widerstandsänderung infolge Ausfalls des Flüssigkeitsstroms wird über einen mit der Elektrode verbundenen Verstärker die Pumpe ausgeschaltet. Durch die zusätzlich benötigte Elektrode ist dieses bekannte Verfahren für ein Haushaltsbügeleisen zu aufwendig.DE 29 25 830 A1 discloses a dry run protection for pumps, wherein with the help of a protruding into the liquid flow of the pump Electrode measured the resistance between the pump housing and liquid becomes. In the event of a change in resistance due to the failure of the Liquid flow is connected to the electrode via a Amplifier turned off the pump. By the additionally required  Electrode is this known method for a household iron too complex.

In Anbetracht der Tatsache, daß bei Dampfbügeleisen der Wassertank relativ klein ist, ist der technische Aufwand für eine Füllstandsüberwachung sehr groß. Außerdem unterliegt der Wassertank äußeren Einflüssen, wie Schräglagen, Schütteln usw., wodurch eine Füllstandsüberwachung nicht sicherstellt, daß die Pumpe rechtzeitig abgeschaltet wird.Considering the fact that with steam irons the water tank is relative is small, the technical effort for level monitoring is very high big. In addition, the water tank is subject to external influences, such as Oblique positions, shaking, etc., which means that level monitoring is not ensures that the pump is switched off in good time.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, die bei geringstem Aufwand das Trockenlaufen von elektromagnetischen Schwingkolbenpumpen zuverlässig verhindert.The invention has for its object to provide a method that with minimal effort the dry running of electromagnetic Vibrating piston pumps reliably prevented.

Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des Anspruchs 1.This problem is solved by the characterizing features of the claim 1.

Hierdurch wird erreicht, daß ohne aufwendige Füllstandsmessung ein Trockenlaufen von elektrischen Schwingkolbenpumpen zuverlässig verhindert wird und somit irreversible Schäden an der Pumpe vermieden werden.This ensures that without a complex level measurement Electrical vibrating piston pumps reliably prevented from running dry irreversible damage to the pump is avoided.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und wird nachfolgend näher beschrieben. Es zeigen:An embodiment of the invention is shown in the drawings and is described in more detail below. Show it:

Fig. 1 ein Blockschaltbild des erfindungsgemäßen Verfahrens; Fig. 1 is a block diagram of the method according to the invention;

Fig. 2 ein Diagramm des Pumpenstroms einer Schwingkolbenpumpe mit Wasser; Fig. 2 is a diagram of the pump current of a piston pump with water;

Fig. 3 ein Diagramm des Pumpenstroms einer Schwingkolbenpumpe ohne Wasser. Fig. 3 is a diagram of the pump current of a vibrating piston pump without water.

Die Fig. 1 zeigt eine Schwingkolbenpumpe 1, die in Serienschaltung mit einem Shunt 3, einem Schalter 5 und einer Diode 6 an die Wechselspannungsversorgung 2 angeschlossen ist sowie einer Auswerte- und Steuerelektronik 4 mit einem Verstärker 4a, einem Bandpaßfilter 4b, einem Spitzenwertgleichrichter 4c, einem Potentiometer 4d zur Erzeugung einer Vergleichsspannung und einem Komparator 4e. Fig. 1 shows a vibrating piston pump 1 , which is connected in series with a shunt 3 , a switch 5 and a diode 6 to the AC voltage supply 2 and an evaluation and control electronics 4 with an amplifier 4 a, a bandpass filter 4 b, a peak value rectifier 4 c, a potentiometer 4 d for generating a comparison voltage and a comparator 4 e.

Im Betrieb mit Wasser stellt sich am Shunt 3 eine Meßspannung ein, die vom Pumpenstrom verursacht wird. Diese Meßspannung wird von der elektronischen Auswerte- und Steuerelektronik 4 ausgewertet. Solange die Pumpe 1 Wasser fördert, hat diese Meßspannung im wesentlichen das Erscheinungsbild einer oberwellenfreien Sinushalbwelle, wie in Fig. 2 dargestellt.When operating with water, a measuring voltage is created on the shunt 3 , which is caused by the pump current. This measuring voltage is evaluated by the electronic evaluation and control electronics 4 . As long as the pump 1 pumps water, this measuring voltage essentially has the appearance of a harmonic-free sine half-wave, as shown in FIG. 2.

Sobald die Pumpe 1 trockenläuft, ist die Beschleunigung des Schwingkolbens der Pumpe 1 mangels fehlender Dämpfung durch das Wasser so groß, daß der Schwingkolben heftig an seinen Anschlag prallt und von dort zurückgeworfen wird. Die hierbei entstehenden Induktionseffekte erzeugen die in Fig. 3 dargestellte hochfrequente Stromänderung. Diese Stromänderung wird von der elektronischen Auswerte- und Steuerelektronik 4, nach Verstärker 4a, Filtern 4b, Gleichrichten des Spitzenwertes 4c und Vergleichen in an sich bekannter Weise erkannt und in der Folge die Pumpe 1 über den Schalter 5 abgeschaltet.As soon as the pump 1 runs dry, the acceleration of the oscillating piston of the pump 1 is so great due to the lack of damping by the water that the oscillating piston violently hits its stop and is thrown back from there. The resulting induction effects produce the high-frequency current change shown in FIG. 3. This change in current is recognized by the electronic evaluation and control electronics 4 , after amplifiers 4 a, filters 4 b, rectification of the peak value 4 c and comparisons in a manner known per se and pump 1 is then switched off via switch 5 .

BezugszeichenlisteReference list

1 = Schwingkolbenpumpe
2 = Wechselspannungsversorgung
3 = Shunt
4a = Verstärker
4b = Bandpaßfilter
4c = Spitzenwertgleichrichter
4d = Potentiometer
4e = Komparator
5 = Schalter
6 = Diode 1 = oscillating piston pump
2 = AC power supply
3 = shunt
4 a = amplifier
4 b = bandpass filter
4 c = peak value rectifier
4 d = potentiometer
4 e = comparator
5 = switch
6 = diode

Claims (1)

Verfahren zur Verhinderung des Trockenlaufens von elektromagnetischen, insbesondere bei Dampfbügeleisen verwendeten Schwingkolbenpumpen zur Förderung von Wasser aus dem Wassertank zu den einzelnen Verbrauchern, wie Verdampfungskammer, Zusatzverdampfungskammer und Sprüheinrichtung, dadurch gekennzeichnet, daß der Pumpenstrom oder die Pumpenspannung einer Schwingkolbenpumpe (1) mittels einer Auswerte- und Steuerelektronik (4), überwacht und analysiert wird, indem die beim Trockenlaufen der Pumpe (1) entstehenden Oberschwingungen mittels Signalaufbereitung extrahiert werden und daraus ein Signal zur Abschaltung der Pumpe (1) oder ein Warnsignal für den Benutzer abgeleitet wird.Method for preventing the dry running of electromagnetic oscillating piston pumps, particularly used in steam irons, for conveying water from the water tank to the individual consumers, such as the evaporation chamber, additional evaporation chamber and spraying device, characterized in that the pump current or the pump voltage of an oscillating piston pump ( 1 ) by means of an evaluation and control electronics ( 4 ), is monitored and analyzed by extracting the harmonics which arise when the pump ( 1 ) is running dry by means of signal conditioning and deriving a signal for switching off the pump ( 1 ) or a warning signal for the user.
DE1995134464 1995-09-16 1995-09-16 Device preventing dryout of electromagnetic oscillating-piston pump Expired - Fee Related DE19534464C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1995134464 DE19534464C1 (en) 1995-09-16 1995-09-16 Device preventing dryout of electromagnetic oscillating-piston pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1995134464 DE19534464C1 (en) 1995-09-16 1995-09-16 Device preventing dryout of electromagnetic oscillating-piston pump

Publications (1)

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DE19534464C1 true DE19534464C1 (en) 1996-12-05

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713548U1 (en) * 1997-07-30 1997-09-25 Leybold Vakuum Gmbh Evacuation facility
DE19736752A1 (en) * 1997-08-23 1999-02-25 Itt Mfg Enterprises Inc Control circuit for hydraulic brake pump
DE19738844A1 (en) * 1997-09-05 1999-04-22 Dosier Und Prozestechnik Salzw Electronic function monitoring method for dosing pump
DE19826292A1 (en) * 1998-06-12 1999-12-23 Linde Ag Process for operating a pump to convey boiling refrigerants or refrigerants
DE19927961A1 (en) * 1999-06-18 2001-01-04 Sauer Sundstrand Gmbh & Co Determining operating revolution rate, working pressure, pivot angle for axial piston machine involves frequency analysis of detected sound in solid, liquid or air signal from machine
EP0908278B1 (en) * 1997-10-04 2003-03-19 Braun GmbH Method for determining the quantity of the cutting material cut by an electrically driven cutting tool and hair cutting tool with means for the execution of the method
FR2855223A1 (en) * 2003-05-22 2004-11-26 Seb Sa Electromagnetic pump loading state detecting method for e.g. automatic coffee maker, involves detecting loading state when difference between maximum pump current time and reference time approaches value related to pumps vacuum state
FR2875962A1 (en) * 2004-09-30 2006-03-31 Seb Sa METHOD FOR ELECTRICAL PROTECTION OF AN ELECTRICAL APPLIANCE
CN101737308B (en) * 2008-11-10 2013-01-16 苏州韩京姬科技有限公司 Control apparatus for solenoid pump of instant heating steam cleaner
EP2579445A1 (en) * 2011-10-07 2013-04-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Peak detector for switched ac/dc converter
CN103975247A (en) * 2011-10-07 2014-08-06 弗兰霍菲尔运输应用研究公司 Peak detector with false peak rejection
EP3382089A1 (en) 2017-03-31 2018-10-03 BSH Hausgeräte GmbH Steam ironing apparatus for detecting a lack of water
CN110657859A (en) * 2019-09-29 2020-01-07 广东科高电器有限公司 Waterless dry-burning detection circuit
US10781802B2 (en) 2014-12-23 2020-09-22 Werner Rogg Pumping system for gaseous and liquid media

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2925830A1 (en) * 1979-06-27 1981-01-15 Rudolf Steffan Dry-running safety cut=out for pump - uses resistance variation between flow stream and pump housing to disconnect pump motor
DE4336823A1 (en) * 1993-10-28 1995-05-04 Ulf Dr Ing Brunke Device for electronically monitoring the position of diaphragms

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2925830A1 (en) * 1979-06-27 1981-01-15 Rudolf Steffan Dry-running safety cut=out for pump - uses resistance variation between flow stream and pump housing to disconnect pump motor
DE4336823A1 (en) * 1993-10-28 1995-05-04 Ulf Dr Ing Brunke Device for electronically monitoring the position of diaphragms

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29713548U1 (en) * 1997-07-30 1997-09-25 Leybold Vakuum Gmbh Evacuation facility
DE19736752A1 (en) * 1997-08-23 1999-02-25 Itt Mfg Enterprises Inc Control circuit for hydraulic brake pump
DE19738844A1 (en) * 1997-09-05 1999-04-22 Dosier Und Prozestechnik Salzw Electronic function monitoring method for dosing pump
EP0908278B1 (en) * 1997-10-04 2003-03-19 Braun GmbH Method for determining the quantity of the cutting material cut by an electrically driven cutting tool and hair cutting tool with means for the execution of the method
DE19826292A1 (en) * 1998-06-12 1999-12-23 Linde Ag Process for operating a pump to convey boiling refrigerants or refrigerants
DE19927961A1 (en) * 1999-06-18 2001-01-04 Sauer Sundstrand Gmbh & Co Determining operating revolution rate, working pressure, pivot angle for axial piston machine involves frequency analysis of detected sound in solid, liquid or air signal from machine
DE19927961B4 (en) * 1999-06-18 2005-09-29 Sauer-Sundstrand Gmbh & Co. Method for determining the operating parameters operating speed, working pressure and swivel angle
FR2855223A1 (en) * 2003-05-22 2004-11-26 Seb Sa Electromagnetic pump loading state detecting method for e.g. automatic coffee maker, involves detecting loading state when difference between maximum pump current time and reference time approaches value related to pumps vacuum state
WO2004106736A1 (en) * 2003-05-22 2004-12-09 Seb S.A. Method for detecting the state of charge of an electromagnetic pump having a vibrating core and pertaining to an electrical household appliance
CN100366896C (en) * 2003-05-22 2008-02-06 Seb公司 Method for detecting the state of charge of an electromagnetic pump having a vibrating core and pertaining to an electrical household appliance
WO2006035171A1 (en) * 2004-09-30 2006-04-06 Seb S.A. Method for the electrical protection of an electrical household appliance
FR2875962A1 (en) * 2004-09-30 2006-03-31 Seb Sa METHOD FOR ELECTRICAL PROTECTION OF AN ELECTRICAL APPLIANCE
US7650247B2 (en) 2004-09-30 2010-01-19 Seb S.A. Method for the electrical protection of an electrical household appliance
CN101737308B (en) * 2008-11-10 2013-01-16 苏州韩京姬科技有限公司 Control apparatus for solenoid pump of instant heating steam cleaner
EP2579445A1 (en) * 2011-10-07 2013-04-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Peak detector for switched ac/dc converter
CN103975247A (en) * 2011-10-07 2014-08-06 弗兰霍菲尔运输应用研究公司 Peak detector with false peak rejection
US9294004B2 (en) 2011-10-07 2016-03-22 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Peak detector with improved false peak rejection
CN103975247B (en) * 2011-10-07 2016-08-24 弗劳恩霍夫应用研究促进协会 There is the peak detector of ghost peak refusal
US9450504B2 (en) 2011-10-07 2016-09-20 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Rectifier circuit with AC side short-circuiting function and synchronized switch harvesting on inductor converter
US10781802B2 (en) 2014-12-23 2020-09-22 Werner Rogg Pumping system for gaseous and liquid media
EP3382089A1 (en) 2017-03-31 2018-10-03 BSH Hausgeräte GmbH Steam ironing apparatus for detecting a lack of water
DE102017210030A1 (en) 2017-03-31 2018-10-04 BSH Hausgeräte GmbH Steam ironing device for detecting water shortage
CN110657859A (en) * 2019-09-29 2020-01-07 广东科高电器有限公司 Waterless dry-burning detection circuit

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