EP0268155B1 - Washing machine with a device for preventing the formation of foam - Google Patents
Washing machine with a device for preventing the formation of foam Download PDFInfo
- Publication number
- EP0268155B1 EP0268155B1 EP87116306A EP87116306A EP0268155B1 EP 0268155 B1 EP0268155 B1 EP 0268155B1 EP 87116306 A EP87116306 A EP 87116306A EP 87116306 A EP87116306 A EP 87116306A EP 0268155 B1 EP0268155 B1 EP 0268155B1
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- Prior art keywords
- washing machine
- machine according
- laundry drum
- foam
- spin
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- 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
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/06—Arrangements for preventing or destroying scum
Definitions
- the invention relates to a program-controlled washing machine according to the preamble of patent claim 1.
- Washing machines of this type are generally known. In such washing machines, in order to reduce the wash liquor still contained in the wash items after each wash cycle and thus to increase the efficiency of this wash cycle, the wash items are spun at the end of each wash cycle.
- the laundry drum containing the laundry is operated during the spin cycle at a high rotational speed, which is approximately in the order of magnitude of 800 to 1200 rpm.
- the mixture of water and detergent which is expelled from the laundry or spun material and passes through the perforated laundry drum jacket, often develops foam in the lower part of the tub after a spin cycle of a few seconds, which reduces the function the emptying pump is considerably impeded and the pumping process is even temporarily interrupted.
- a washing machine with a heated tub and a device for preventing overflowing in which an electrode triggering a switch contact is attached in the tub somewhat above the highest possible washing water level. If excessive foaming occurs in the tub during the washing process, the foam in the tub inevitably rises and acts on the electrode attached there. With the foam applied to the electrode the switching contact closes the circuit to a device which then switches off the tub heater. In this washing machine, this device has the task of preventing the suds container from foaming during the heating process of the washing liquor by interrupting the suds heating process.
- the invention has for its object to design a program-controlled washing machine of the type mentioned in such a way that at the earliest possible time after completion of the washing process with the maximum possible highest drum speed, the laundry without the risk of further pumping out of the detergent foam formation in the tub can be thrown.
- the output signals of the measuring device are an indication of foam formation during the spin cycle and that these output signals represent control variables for the drive motor of the laundry drum and thus for the control of the spin speed.
- the laundry drum is only run up to a higher spin speed when there is practically no appreciable foam and that an automatic speed adjustment for the laundry drum is carried out in the event of undesirable foam development.
- This has the advantage that the centrifugal run-up takes place without so-called water splashing in the laundry drum, which results in a considerable reduction in noise.
- a purely function-dependent pumping out of the liquor is possible, as a result of which an optimal dewatering and thus an excellent washing effect of the laundry is achieved.
- the improved pumping performance and good dewatering of the items to be washed it is possible to ramp up extremely quickly to the maximum spin speed of, for example, 850 rpm.
- the laundry drum of a washing machine is referred to, which is rotatably housed in a tub 2 (washing tub).
- the laundry drum 1 is provided in the usual manner on its entire outer surface with perforations for the passage of water or washing and rinsing liquor and can be driven by a motor either in the washing cycle or in the spin cycle.
- This laundry drum can therefore also perform the spin cycle of the laundry, which usually ends a washing program or rinsing program.
- the perforated laundry drum 1 containing the laundry is partially immersed in the wash liquor (wash liquor, rinsing water) present in the tub.
- the drive motor 5 and thus the drive 6 for the laundry drum 1 are controlled via an electrical regulating and control unit 7.
- the drain line 3 goes between the drain pump 4 and the tub 2 from a measuring pipeline 8, which contains a measuring device 9 for the liquor level in the tub 2 which responds to the water pressure in the laundry drum 1 or the tub 2.
- An analog or pneumatic pressure sensor advantageously serves as the measuring device 9, which is connected in parallel to the liquor or lye level in the laundry drum 1 or the lye container 2.
- the regulating and control unit 7 is preceded by a level comparator 10 and a control element 11 influencing the current for the drive motor 5 is connected downstream.
- the level comparator 10 which is connected to the measuring device 9, receives its data from the measuring device 9, the output signals (level signals) of which are an indication of the foam formation or the foam development in the tub 2 during the spinning process. These output signals represent a controlled variable for the drive motor 5 of the laundry drum 1 and thus for the regulation or influencing of the spin speed for the laundry drum 1.
- the electrical control unit 7 for the drive motor 5 can be assigned further control elements through which the circuit of the Drive motor of a mechanically controlled program switching mechanism and / or the circuit of a clutch magnet for the program crossing distances of the program switching mechanism can additionally be interrupted or closed.
- the aim is to ensure that the laundry as soon as possible after the end of the washing process with the maximum possible highest drum speed, regardless of the respective type and amount of laundry as well as the type and amount of detergent can be dewatered without swirling existing wash liquor from the last wash cycle. This prevents excessive foam from forming in the laundry drum. This has the further advantage that the residual liquor can now be pumped out completely and a good rinsing effect can be achieved with reduced water consumption.
- the initially low initial spin speed for the laundry drum after a gentle start in small steps e.g. B. 50 rpm
- the analog pressure sensor 9 connected in parallel with the liquor or liquor level and thus consequently no further increase or there is an increase in foam formation, d. that is, an existing certain low foam limit in the laundry drum or the tub for a certain period of z. B. is equal to or falls below a second.
- the speed of the laundry drum drive motor 5 via the described regulating and control unit 7 in connection with the control element 11 in small steps, e.g. B. 50 U / min, until the foam limit has returned to a certain low level and remains below.
- a certain critical foam limit is not exceeded at a drum speed of around 100 rpm or when the centrifugal setpoint is activated, the spinning process is stopped immediately and a rinsing process repeated or interposed.
- the analog pressure sensor 9 used in the washing machine described makes it possible for all washing levels to be detected therewith; H. any level between 35 mm water column (foam level limit) and 300 mm water column (safety level limit) can be controlled.
- the spin cycle is also interrupted and the amount of rinsing water in the subsequent rinse cycle is increased if the foam limit is no longer undershot at a predetermined or specified washing drum speed. Furthermore, the spinning process is stopped as well the duration of the rinse cycle of the subsequent rinse cycle is extended and / or the reversing process (movement mechanism for shifting the items to be washed) increases during the subsequent rinse cycle if the foam limits are no longer undershot at a predetermined wash drum speed.
- Another process step is that the drum speed is reduced until the drum comes to a standstill when the foam is present and then accelerated again to at least 100 rpm for a predetermined period of time.
- This washing drum speed reduction and acceleration is expediently repeated several times, although the number of these repetitions is limited depending on the type of laundry or choice of washing program.
- the predetermined laundry drum speed reduction steps and / or laundry drum speed acceleration steps can, depending on the type of laundry, program selection and / or number of spin cycle value additions, be appropriately multiplied by a corresponding factor.
- the laundry drum speed reduction and / or acceleration can be increased degressively or progressively.
- the program-specific spin duration in the individual processes shown is only started when a predetermined or specified washing drum minimum speed and / or minimum startup period has been exceeded.
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- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
Description
Die Erfindung betrifft eine programmgesteuerte Waschmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a program-controlled washing machine according to the preamble of
Waschmaschinen dieser Art sind allgemein bekannt. Bei solchen Waschmaschinen wird, um die im Waschgut nach jedem Spülgang noch enthaltende Waschlauge zu verrringern und damit den Wirkungsgrad dieses Arbeitsganges zu erhöhen, das Waschgut am Ende eines jeden Spülganges geschleudert. Die das Waschgut enthaltende Wäschetrommel wird beim Schleudervorgang mit hoher Umdrehungsgeschwindigkeit betrieben, die etwa in der Größenordnung von 800 bis 1200 U/min liegt. Während des Schleudervorganges entwickelt sich nun aber aus dem Gemisch von Wasser und Waschmitteln, das aus dem Wasch- bzw. Schleudergut ausgetrieben wird und durch den perforierten Wäschetrommelmantel hindurchtritt, im unteren Bereich des Laugenbehälters schon nach einer Schleuderdauer von einigen Sekunden oftmals Schaum, wodurch die Funktion der Entleerungspumpe erheblich behindert und der Abpumpvorgang zeitweise sogar unterbrochen wird.Washing machines of this type are generally known. In such washing machines, in order to reduce the wash liquor still contained in the wash items after each wash cycle and thus to increase the efficiency of this wash cycle, the wash items are spun at the end of each wash cycle. The laundry drum containing the laundry is operated during the spin cycle at a high rotational speed, which is approximately in the order of magnitude of 800 to 1200 rpm. During the spin cycle, the mixture of water and detergent, which is expelled from the laundry or spun material and passes through the perforated laundry drum jacket, often develops foam in the lower part of the tub after a spin cycle of a few seconds, which reduces the function the emptying pump is considerably impeded and the pumping process is even temporarily interrupted.
Aus der FR-A-15 01 393 ist eine Waschmaschine mit beheiztem Laugenbehälter und einer Einrichtung zur Vermeidung des Überschäumens bekannt, bei der im Laugenbehälter etwas oberhalb des höchstmöglichen Waschlaugenstandes eine einen Schaltkontakt auslösende Elektrode angebracht ist. Kommt es nun während des Aufheizvorganges der Waschlauge im Laugenbehälter zu einer übermäßigen Schaumentwicklung, so steigt der Schaum im Laugenbehälter zwangsläufig hoch und beaufschlagt die dort angebrachte Elektrode. Mit der Schaumbeaufschlagung der Elektrode wird durch deren Schaltkontakt der Stromkreis zu einer die Laugenbehälter-Heizung dann ausschaltenden Einrichtung geschlossen. Diese Einrichtung hat bei dieser Waschmaschine die Aufgabe, ein Überschäumen des Laugenbehälters während des Aufheizvorganges der Waschlauge durch Unterbrechen des Laugen-Aufheizvorganges auszuschließen.From FR-A-15 01 393 a washing machine with a heated tub and a device for preventing overflowing is known, in which an electrode triggering a switch contact is attached in the tub somewhat above the highest possible washing water level. If excessive foaming occurs in the tub during the washing process, the foam in the tub inevitably rises and acts on the electrode attached there. With the foam applied to the electrode the switching contact closes the circuit to a device which then switches off the tub heater. In this washing machine, this device has the task of preventing the suds container from foaming during the heating process of the washing liquor by interrupting the suds heating process.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, eine programmgesteuerte Waschmaschine der eingangs genannten Art so auszugestalten, daß zu einem möglichst frühen Zeitpunkt nach Beendigung des Waschvorganges mit der maximal möglichen höchsten Wäschetrommel-Drehzahl das Waschgut ohne Gefahr einer das weitere Abpumpen der Waschlauge behindernden Schaumbildung im Laugenbehälter geschleudert werden kann.In contrast, the invention has for its object to design a program-controlled washing machine of the type mentioned in such a way that at the earliest possible time after completion of the washing process with the maximum possible highest drum speed, the laundry without the risk of further pumping out of the detergent foam formation in the tub can be thrown.
Die Lösung dieser Aufgabe gemäß der Erfindung besteht darin, daß die Ausgangssignale der Meßeinrichtung ein Indiz für eine Schaumbildung Während des Schleudervorganges sind und daß diese Ausgangssignale Regelgrößen für den Antriebsmotor der Wäschetrommel und damit für die Regelung der Schleuderdrehzahl darstellen.The solution to this problem according to the invention is that the output signals of the measuring device are an indication of foam formation during the spin cycle and that these output signals represent control variables for the drive motor of the laundry drum and thus for the control of the spin speed.
Mit der Erfindung wird erreicht, daß die Wäschetrommel nur dann auf eine höhere Schleuderdrehzahl hochgefahren wird, wenn praktisch kein nennenswerter Schaum vorhanden ist und daß bei einer unerwünschten Schaumentwicklung eine automatische Drehzahlanpassung für die Wäschetrommel vorgenommen wird. Daraus ergibt sich der Vorteil, daß der Schleuderhochlauf ohne sogenanntes Wasserpanschen in der Wäschetrommel abläuft, was eine erhebliche Geräuschverminderung zur Folge hat. Durch das Erfassen bzw. Abfragen der jeweiligen Schaumgrenze im Laugenbehälter ist ein rein funktionsabhängiges Abpumpen der Lauge möglich, wodurch eine optimale Entwässerung und damit ausgezeichnete Spülwirkung der Wäsche erreicht wird. Infolge der erreichten verbesserten Abpumpleistung und guten Entwässerung des Waschgutes ist ein äußerst schnelles Hochfahren auf die maximalste Schleuderdrehzahl von z.B. 850 U/min möglich.With the invention it is achieved that the laundry drum is only run up to a higher spin speed when there is practically no appreciable foam and that an automatic speed adjustment for the laundry drum is carried out in the event of undesirable foam development. This has the advantage that the centrifugal run-up takes place without so-called water splashing in the laundry drum, which results in a considerable reduction in noise. By detecting or querying the respective foam limit in the tub, a purely function-dependent pumping out of the liquor is possible, as a result of which an optimal dewatering and thus an excellent washing effect of the laundry is achieved. As a result of the improved pumping performance and good dewatering of the items to be washed, it is possible to ramp up extremely quickly to the maximum spin speed of, for example, 850 rpm.
Weitere vorteilhafte Ausführungsvarianten der Meßeinrichtung zur Schaumerkennung sowie weitere zweckmäßige Betriebsschritte zur Verhinderung einer Schaumbildung bzw. Abbau von im Laugenbehälter entstandenen Schaum sind in den Unteransprüchen angegeben.Further advantageous design variants of the measuring device for foam detection and further expedient operating steps to prevent foam formation or breakdown of foam formed in the tub are specified in the subclaims.
Anhand eines in der Zeichnung veranschaulichten Ausführungsbeispieles wird die Erfindung nachfolgend näher beschrieben.The invention is described in more detail below on the basis of an exemplary embodiment illustrated in the drawing.
Es zeigen:
- Fig. 1
- in vereinfachter Darstellung eine Waschmaschine mit einer die Schaumbildung im Laugenbehälter erfaßenden Meßeinrichtung und die Wäschetrommelmotorsteuerung,
- Fig. 2
- ein Flußdiagramm, das die Reihenfolge der Verfahrensschritte einer Ausführungsform der Erfindung zeigt.
- Fig. 1
- in a simplified representation, a washing machine with a measuring device which detects the foam formation in the tub and the laundry drum motor control,
- Fig. 2
- a flowchart showing the order of the method steps of an embodiment of the invention.
Mit 1 ist die Wäschetrommel einer nicht weiter dargestellten Waschmaschine bezeichnet, die in einem Laugenbehälter 2 (Waschbottich) drehbar untergebracht ist. Die Wäschetrommel 1 ist in üblicher Weise auf ihrer gesamten Mantelfläche mit Perforierungen für den Durchtritt von Wasser bzw. Wasch- und Spüllauge versehen und ist motorisch wahlweise im Waschgang oder im Schleudergang antreibbar. Diese Wäschetrommel kann damit auch das ein Waschprogramm oder Spülprogramm in der Regel beendigende Schleudern der Wäsche vornehmen. Vom Boden des Laugenbehälters 2 geht eine Ablaufleitung 3 mit einer zwischengeschalteten Entleerungspumpe 4 ab. Nach der Entleerungspumpe 4 geht die Ablaufleitung 3 in eine Abflußsteigleitung 3' über. Während des gesamten Wasch- und auch Spülvorganges ist die das Waschgut enthaltende perforierte Wäschetrommel 1 in der im Laugenbehälter anstehenden Waschflotte (Waschlauge, Spülwasser) zum Teil eingetaucht. Gesteuert wird der Antriebsmotor 5 und damit der Antrieb 6 für die Wäschetrommel 1 über eine elektrische Regel- und Steuereinheit 7. Zwischen der Entleerungspumpe 4 und dem Laugenbehälter 2 geht von der Ablaufleitung 3 eine Meß-Rohrleitung 8 ab, welche eine auf den Wasserdruck in der Wäschetromel 1 bzw. des Laugenbehälters 2 ansprechende Meßeinrichtung 9 für den Flottenstand im Laugenbehälter 2 enthält. Als Meßeinrichtung 9, die parallel zum Flotten- bzw. Laugenniveau in der Wäschetrommel 1 bzw. des Laugenbehälters 2 angeschlossen ist, dient in vorteilhafter Weise ein analoger oder pneumatischer Drucksensor. Es wäre auch denkbar, als Meßeinrichtung zur Erfassung der Schaumbildung eine druckunabhängige Einrichtung zu verwenden. Der Regel- und Steuereinheit 7 ist ein Niveau-Komparator 10 vorgeschaltet sowie ein den Strom für den Antriebsmotor 5 beieinflussendes Steuerglied 11 nachgeschaltet. Der Niveau-Komparator 10, der an der Meßeinrichtung 9 angeschlossen ist, erhält seine Daten von der Meßeinrichtung 9, deren Ausgangssignale (Niveausignale) ein Indiz für die Schaumbildung bzw. die Schaumentwicklung im Laugenbehälter 2 während des Schleudervorganges sind. Diese Ausgangssignale stellen eine Regelgröße für den Antriebsmotor 5 der Wäschetrommel 1 und damit für die Regelung bzw. Beeinflußung der Schleuderdrehzahl für die Wäschetrommel 1 dar. Der elektrischen Regel- und Steuereinheit 7 für den Antriebsmotor 5 können weitere Steuerglieder zugeordnet sein, durch die der Stromkreis des Antriebsmotors eines mechanisch gesteuerten Programmschaltwerkes und/oder der Stromkreis eines Kupplungsmagneten für die Programm-Überfahrstrecken des Programmschaltwerkes zusätzlich unterbrochen oder geschlossen werden kann.With 1 the laundry drum of a washing machine, not shown, is referred to, which is rotatably housed in a tub 2 (washing tub). The
Mit der beschriebenen Meßeinrichtung 9 und der Regel- und Steuereinheit 7 soll erreicht werden, daß zu einem möglichst frühen Zeitpunkt nach Beendigung des Waschvorganges mit der maximal möglichen höchsten Wäschetrommel-Drehzahl das Waschgut unabhängig von der jeweiligen Wäscheart und Wäschemenge sowie Waschmittelart und Waschmittelmenge soweit wie möglich entwässert werden kann, ohne daß dabei vom letzten Waschgang her vorhandene Waschlauge verwirbelt wird. Dadurch wird verhindert, daß sich in der Wäschetrommel übermäßig Schaum bilden kann. Daraus resultiert der weitere Vorteil, daß nunmehr auch ein vollständiges Abpumpen der Restlauge durchführbar und eine gute Spülwirkung bei verminderten Wasserverbrauch erreichbar ist.With the
Die Arbeitsweise der beschriebenen Waschmaschine mit sogenannter Schaumbremse nach dem Flußdiagramm in Fig. 2 ist nun folgende:The operation of the washing machine described with a so-called foam brake according to the flow chart in Fig. 2 is now as follows:
Um zu verhindern, daß sich nach Beginn bzw. nach Einsetzen des Schleudervorganges in der Wäschetrommel bzw. im Laugenbehälter 2 übermäßig Schaum bilden kann, wird die zunächst niedere Anfangsschleuderdrehzahl für die Wäschetrommel nach einem Sanftanlauf in kleinen Schritten, von z. B. 50 U/min, nur dann erhöht, wenn über den parallel zum Flotten- bzw. Laugenniveau angeschlossenen analogen Drucksensor 9 in der Meß-Rohrleitung 8 keine Erhöhung des Wasserdruckes im Laugenbehälter 2 gemessen bzw. registriert wird und damit folglich auch keine weitere Erhöhung bzw. Steigerung der Schaumbildung vorliegt, d. h., daß eine vorhandene bestimmte niedere Schaumgrenze in der Wäschetrommel bzw. dem Laugenbehälter während einer bestimmten Zeitdauer von z. B. einer Sekunde gleich bzw. unterschritten ist. Wird jedoch die Schaumgrenze in der Wäschetrommel bzw. im Laugenbehälter längere Zeit nicht unterschritten, so wird die Drehzahl des Wäschetrommelantriebsmotors 5 über die beschriebene Regel- und Steuereinheit 7 in Verbindung mit dem Steuerglied 11 in kleinen Schritten, von z. B. 50 U/min, solange reduziert, bis sich die Schaumgrenze wieder auf ein bestimmtes niedriges Niveau eingestellt hat und bleibend unterschritten wird. Sollte jedoch aber eine bestimmte kritische Schaumgrenze schon bei einer Trommel-Drehzahl von etwa 100 U/min oder bei der Schleudersollwertaufschaltung nicht mehr unterschritten werden, so wird der Schleudervorgang umgehend abgebrochen und ein Spülvorgang wiederholt bzw. zwischengeschaltet. Der bei der beschriebenen Waschmaschine eingesetzte analoge Drucksensor 9 ermöglicht es, daß damit alle Waschniveaus erfaßt werden können, d. h. jedes Niveau zwischen 35 mm Wassersäule (Schaumniveaugrenze) und 300 mm Wassersäule (Sicherheitsniveaugrenze) ist ansteuerbar.In order to prevent excessive foam from forming in the laundry drum or in the
Der Schleudervorgang wird auch abgebrochen und die Spülwassermenge des nachfolgenden Spülganges wird erhöht, wenn die Schaumgrenze bei einer vorab bestimmten bzw. festgelegten Wäschetrommel-Drehzahl nicht mehr unterschritten wird. Ferner wird der Schleudervorgang abgebrochen sowie die Spülgang-Zeitdauer des nachfolgenden Spülgangs verlängert und/oder der Reversiervorgang (Bewegungsmechanik für das Umschichten des Waschgutes) während des nachfolgenden Spülgangs erhöht, wenn die Schaumgrenzen bei einer vorab bestimmten Waschtrommel-Drehzahl nicht mehr unterschritten wird.The spin cycle is also interrupted and the amount of rinsing water in the subsequent rinse cycle is increased if the foam limit is no longer undershot at a predetermined or specified washing drum speed. Furthermore, the spinning process is stopped as well the duration of the rinse cycle of the subsequent rinse cycle is extended and / or the reversing process (movement mechanism for shifting the items to be washed) increases during the subsequent rinse cycle if the foam limits are no longer undershot at a predetermined wash drum speed.
Ein weiterer Verfahrensschritt besteht darin, daß die Wäschetrommel-Drehzahl bei vorhandenem Schaum bis zum Stillstand der Wäschetrommel reduziert und danach bei einer vorab bestimmten bzw. festgelegten Zeitdauer wieder auf mindestens 100 U/min beschleunigt wird. Diese Waschtrommel-Drehzahl-Reduzierung und -Beschleunigung wird zweckmäßig mehrmals wiederholt, wobei jedoch die Anzahl dieser Wiederholungen je nach Wäscheart bzw. Waschprogrammwahl begrenzt ist. Die vorab bestimmten Wäschetrommel-Drehzahl-Reduzierungsschritte und/oder Wäschetrommel-Drehzahl-Beschleunigungsschritte können je nach Wäscheart, Programmwahl und/oder Anzahl der Schleudersollwertaufschaltungen zweckmäßig zusätzlich mit einem entsprechenden Faktor multipliziert werden. Die Steigerung der Wäschetrommel-Drehzahl-Reduzierung und/oder -Beschleunigung kann dabei degressiv oder progressiv vorgenommen werden. Die programmspezifische Schleuderzeitdauer bei den aufgezeigten einzelnen Abläufen wird immer erst dann gestartet, wenn eine vorab bestimmte bzw. festgelegte Wäschetrommel-Mindestdrehzahl- und/oder Mindestanlaufzeitdauer überschritten ist.Another process step is that the drum speed is reduced until the drum comes to a standstill when the foam is present and then accelerated again to at least 100 rpm for a predetermined period of time. This washing drum speed reduction and acceleration is expediently repeated several times, although the number of these repetitions is limited depending on the type of laundry or choice of washing program. The predetermined laundry drum speed reduction steps and / or laundry drum speed acceleration steps can, depending on the type of laundry, program selection and / or number of spin cycle value additions, be appropriately multiplied by a corresponding factor. The laundry drum speed reduction and / or acceleration can be increased degressively or progressively. The program-specific spin duration in the individual processes shown is only started when a predetermined or specified washing drum minimum speed and / or minimum startup period has been exceeded.
Claims (17)
- Program-controlled washing machine with a laundry drum (1) which is drivable by a motor (5) in wash and spin gear, and which is located inside a wash container (2), from which the washing and rinsing wash is dischargeable by means of an evacuation pump (4) mounted in a drainage pipe (3, 3'), and a conduit (8) is connected to the drainage pipe (3') between the evacuation pump (4) and the wash container (2), and a measuring device (9) in the form of a sensor is provided for identifying foam in the wash container (2), characterised in that the output signals of the measuring device (9) are an index of foam formation during the spinning process, and in that these output signals represent control quantities for the drive motor (5) of the laundry drum (1) and hence for the control of the spin revolution count.
- Washing machine according to claim 1, characterised in that as a measuring device (9) an analog or pneumatic pressure sensor is provided.
- Washing machine according to claim 1, characterised in that the measuring device (9) is a pressure-dependent device for detecting the foam limit.
- Washing machine according to claim 1, characterised in that, after starting up of the laundry drum (1), the spin revolution count is increased by very small stages only if the permissible foam limit is not exceeded for a specified time period.
- Washing machine according to claim 1, characterised in that, after starting up of the laundry drum (6), the spin revolution count is reduced by very small stages if the foam level does not remain below a specified limit during a relatively long time period.
- Washing machine according to claim 5, characterised in that the spin revolution count is reduced until the foam level again remains permanently below the specified limit.
- Washing machine according to claim 1, characterised in that spinning is interrupted and a rinse gear is switched on if the foam level no longer remains below the specified limit at 100 rev/min or at the spin reference value lock-on.
- Washing machine according to claim 1, characterised in that the measuring device (9) associated with the conduit (8) is connected parallel to the liquid level or wash level in the laundry drum (1).
- Washing machine according to claim 1, characterised in that spinning is interrupted and the quantity of rinsing water for the next rinsing process is increased if the foam level no longer remains below the specified limit at a predetermined revolution count, or a predetermined minimum revolution count is not exceeded during spinning.
- Washing machine according to claim 1, characterised in that spinning is interrupted and the rinsing gear duration of the next rinsing gear is extended and/or the reversing process is increased during the next rinsing gear if the foam level is no longer below the specified limit at a predetermined laundry drum revolution count, or a predetermined minimum revolution count is not exceeded during spinning.
- Washing machine according to claim 1, characterised in that the laundry drum revolution count at the existing foam limit is reduced until standstill and is then accelerated again to at least 100 rev/min after a predetermined time.
- Washing machine according to claim 11, characterised in that the laundry drum speed reduction and acceleration is repeated several times, the number of repetitions being limited according to the type of laundry or choice of program.
- Washing machine according to claim 1, 5, 10 or 11, characterised in that the program-specific spinning duration is only started when a predetermined laundry drum minimum revolution count and/or minimum starting duration is exceeded.
- Washing machine according to claim 7 or one of the following, characterised in that the predetermined laundry drum speed reduction stages and/or the laundry drum speed acceleration stages are additionally multiplied by a corresponding factor, according to the type of laundry, choice of program and/or the number of spin reference value lock-ons.
- Washing machine according to claim 7 or one of the following, characterised in that the laundry drum speed reduction and/or the laundry drum speed acceleration is enhanced degressively or progressively.
- Washing machine according to claim 1 or one of the following, characterised in that a level comparator (10) is connected upstream of the electric adjustment and control unit (7) for the motor (5), and a control member (11) affecting the current for the drive motor (5) is connected downstream, and the level comparator (10) is connected to the measuring device (9).
- Washing machine according to claim 1 or one of the following, characterised in that the electric adjustment and control unit (7) for the motor (5) has further control members, by means of which the circuit of the drive motor of a mechanically controlled program gear mechanism and/or the circuit of a clutch magnet for program crossing sections is additionally interrupted or switched off.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3638498 | 1986-11-11 | ||
| DE3638498A DE3638498C2 (en) | 1986-11-11 | 1986-11-11 | Program-controlled washing machine |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0268155A2 EP0268155A2 (en) | 1988-05-25 |
| EP0268155A3 EP0268155A3 (en) | 1988-08-24 |
| EP0268155B1 true EP0268155B1 (en) | 1991-07-24 |
Family
ID=6313685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87116306A Expired - Lifetime EP0268155B1 (en) | 1986-11-11 | 1987-11-05 | Washing machine with a device for preventing the formation of foam |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0268155B1 (en) |
| DE (2) | DE3638498C2 (en) |
| TR (1) | TR23176A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671910B (en) * | 2002-07-29 | 2011-06-08 | Bsh博施及西门子家用器具有限公司 | Method for removing foam from the washing container of a drum-type washing machine |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3821574A1 (en) * | 1988-06-25 | 1989-12-28 | Licentia Gmbh | Top-loading washing machine |
| DE3840265C2 (en) * | 1988-11-30 | 1996-06-13 | Aeg Hausgeraete Gmbh | Program-controlled washing machine |
| FR2649422B1 (en) * | 1989-07-04 | 1992-01-03 | Esswein Sa | WASHING MACHINE WITH IMPROVED AND ECONOMICAL RINSING |
| EP0429949B1 (en) * | 1989-11-22 | 1994-05-04 | INDUSTRIE ZANUSSI S.p.A. | Automatic laundry washer of the rotating drum type |
| DE4104151A1 (en) * | 1991-02-12 | 1992-08-13 | Miele & Cie | Laundry treatment machine with program control - and foam sensing device with switching mechanism to switch on heating device when foam is detected |
| DE4205816C2 (en) * | 1992-02-26 | 1999-08-19 | Aeg Hausgeraete Gmbh | Program-controlled washing machine |
| IT1282409B1 (en) * | 1995-01-25 | 1998-03-23 | Zanussi Elettrodomestici | WASH-DRYER MACHINE WITH ANTI-FOAM DEVICE |
| DE19549526C2 (en) * | 1995-06-23 | 1999-02-11 | Miele & Cie | Appts. for determining imbalance of washing machine drum |
| DE19606769B4 (en) * | 1996-02-23 | 2006-05-11 | AEG Hausgeräte GmbH | Program-controlled washing machine with a device for reducing foaming |
| DE19839896A1 (en) * | 1998-09-02 | 2000-03-09 | Miele & Cie | Washing machine with a device for determining the weight of the laundry |
| KR101034198B1 (en) * | 2005-02-02 | 2011-05-12 | 삼성전자주식회사 | Washing machine and its foam sensing method |
| EP1971714B1 (en) * | 2005-12-29 | 2019-05-08 | Arçelik Anonim Sirketi | A washing machine and a control method |
| DE102007033492A1 (en) | 2007-07-18 | 2009-01-22 | BSH Bosch und Siemens Hausgeräte GmbH | Process for controlling foam production in a washing machine and washing machine suitable for this purpose |
| DE102007036041A1 (en) * | 2007-08-01 | 2009-02-05 | BSH Bosch und Siemens Hausgeräte GmbH | Method for removing foam in a drum washing machine and drum washing machine suitable for this purpose |
| DE102007042968B4 (en) * | 2007-09-10 | 2021-05-12 | BSH Hausgeräte GmbH | Method for detecting foam in a drum washing machine and a suitable drum washing machine |
| JP5903649B2 (en) * | 2011-06-29 | 2016-04-13 | パナソニックＩｐマネジメント株式会社 | Drum washing machine |
| WO2013001681A1 (en) * | 2011-06-29 | 2013-01-03 | パナソニック株式会社 | Drum washing machine |
| EP2746444B1 (en) * | 2012-12-21 | 2015-12-09 | Electrolux Home Products Corporation N.V. | Method for controlling a laundry washing machine and laundry washing machine |
| EP2848726B1 (en) * | 2013-09-11 | 2019-03-27 | Electrolux Appliances Aktiebolag | A method for operating a washing machine |
| EP2849007B1 (en) | 2013-09-11 | 2020-11-11 | Electrolux Appliances Aktiebolag | A method for controlling a washing machine during a washing cycle |
| DE102015205949A1 (en) | 2015-04-01 | 2016-10-06 | BSH Hausgeräte GmbH | Method for operating a washing machine with foam detection by a motor current evaluation and this suitable washing machine |
| DE102015205945A1 (en) | 2015-04-01 | 2016-10-06 | BSH Hausgeräte GmbH | Method for operating a washing machine with foam detection by a drum speed evaluation and this suitable washing machine |
| EP3318670A1 (en) | 2016-11-08 | 2018-05-09 | BSH Hausgeräte GmbH | Process for the operation of a washing machine with foam detection and washing machine suitable for this process |
| EP3382083A1 (en) * | 2017-03-27 | 2018-10-03 | Vestel Elektronik Sanayi ve Ticaret A.S. | Method for determining foam in a washing machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1123515A (en) * | 1954-05-07 | 1956-09-24 | Electrical device for washing machines to prevent excessive foam formation in the event of an excessively high concentration of detergent | |
| US3492637A (en) | 1965-11-29 | 1970-01-27 | Singer General Precision | Inductive loop vehicle detector |
| DE1610030A1 (en) * | 1965-12-07 | 1970-07-16 | Siemens Elektrogeraete Gmbh | Device to prevent overcooking |
| DE1585731B2 (en) * | 1967-02-22 | 1972-05-31 | Holzer, Walter, 7758 Meersburg | PROGRAM SELECTOR FOR AUTOMATIC WASHING MACHINES |
| DE2325586A1 (en) * | 1973-05-19 | 1974-12-05 | Miele & Cie | Foaming indicator for washing machine or dishwasher - is pressure-dependent switch which (partially) switches off the heating |
| FR2546540B1 (en) * | 1983-05-27 | 1985-07-05 | Thomson Brandt | SHORT-TERM SPINNER WASHING MACHINE AFTER RINSING |
| NZ207319A (en) * | 1984-02-29 | 1988-02-12 | Fisher & Paykel | Clothes washing machine, control of spin cycle and of washing during water entry |
-
1986
- 1986-11-11 DE DE3638498A patent/DE3638498C2/en not_active Expired - Lifetime
-
1987
- 1987-11-04 TR TR770/87A patent/TR23176A/en unknown
- 1987-11-05 EP EP87116306A patent/EP0268155B1/en not_active Expired - Lifetime
- 1987-11-05 DE DE8787116306T patent/DE3771665D1/en not_active Revoked
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1671910B (en) * | 2002-07-29 | 2011-06-08 | Bsh博施及西门子家用器具有限公司 | Method for removing foam from the washing container of a drum-type washing machine |
| CN101899770B (en) * | 2002-07-29 | 2012-04-25 | Bsh博施及西门子家用器具有限公司 | Method for detecting foam in the washing container of a drum washing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| TR23176A (en) | 1989-06-05 |
| EP0268155A2 (en) | 1988-05-25 |
| DE3638498C2 (en) | 1994-06-30 |
| DE3771665D1 (en) | 1991-08-29 |
| DE3638498A1 (en) | 1988-05-19 |
| EP0268155A3 (en) | 1988-08-24 |
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