EP0390956B1 - Signalling device on a vacuum cleaner for monitoring the extent of soiling of at least one dust filter contained in the vacuum cleaner - Google Patents

Signalling device on a vacuum cleaner for monitoring the extent of soiling of at least one dust filter contained in the vacuum cleaner Download PDF

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Publication number
EP0390956B1
EP0390956B1 EP19890106181 EP89106181A EP0390956B1 EP 0390956 B1 EP0390956 B1 EP 0390956B1 EP 19890106181 EP19890106181 EP 19890106181 EP 89106181 A EP89106181 A EP 89106181A EP 0390956 B1 EP0390956 B1 EP 0390956B1
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EP
European Patent Office
Prior art keywords
display
limit
vacuum cleaner
displacing
stop
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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.)
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EP19890106181
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German (de)
French (fr)
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EP0390956A1 (en
Inventor
Frieder Dr.-Ing. Voigt
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Siemens AG
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Siemens AG
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Priority to EP19890106181 priority Critical patent/EP0390956B1/en
Priority to DE8989106181T priority patent/DE58902302D1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/19—Means for monitoring filtering operation

Definitions

  • the invention relates to a display device according to the preamble of claim 1.
  • Such a display device is known from DE-A-33 00 250.
  • a part serving as a display element is coupled to a membrane acted upon by the differential pressure occurring on the vacuum cleaner filter bag.
  • the display element is thus adjusted according to the deflection of the membrane.
  • a wedge which can be adjusted by spring force is arranged displaceably in the housing of the device and, when the display element is correspondingly adjusted, is pushed under the end of an axle piece connected to the display element. After a reduction in the pressure difference, the display element thus remains in the position previously reached with a larger pressure difference.
  • the pressure difference that arises is correspondingly larger and the display element is adjusted further and further through the membrane until it finally passes through a slit membrane and can then be perceived from the outside. This is then the signal for a necessary change of the filter bag.
  • the object of the invention is to signal the necessary change of a post-filter provided in the vacuum cleaner by means of a display device reporting the degree of contamination of the filter bag.
  • a display element coupled to the actuator has a clear starting position after changing the vacuum cleaner filter bag, i.e. Assumes zero position.
  • a display element coupled to the actuator has a clear starting position after changing the vacuum cleaner filter bag, i.e. Assumes zero position.
  • the pressure difference occurring at the adjusting member of the display device is so great that the adjustment of the blocking member is greater than the effective length of the start stop, so that the actuator of the display element is immediately released for a display movement.
  • this is the signal that a change of the post-filter is necessary in order to achieve the desired good filter effect on the one hand and to avoid a reduction in the suction power of the vacuum cleaner on the other hand.
  • the housing consisting of an upper and lower housing parts 2 and 3 of a display device, which can be installed in the housing of a vacuum cleaner, is designated.
  • a membrane 4 is clamped between the two housing parts 2 and 3, with which a blocking element 5 is firmly connected.
  • the blocking element 5 protrudes into the adjustment path of an actuator 8 which is movably guided at two bearings 6 and 7 in the upper housing part 2.
  • the actuator 8 is driven by one end 9 of the actuator 8 and the other end l0 of the housing wall of the actuator 8 upper housing part 2 attached tension spring ll.
  • the actuator could also be driven by a compression spring.
  • the subspaces l4 and l5, each delimited by the two housing parts 2 and 3 and the membrane 4 can be subjected to different pressures.
  • the upper sub-space l4 delimited by the upper housing part 2 and the membrane 4 is connected via the connecting piece l2 with the ambient pressure or with the pressure prevailing immediately in front of a vacuum cleaner filter bag used in the dust chamber of a vacuum cleaner.
  • the pressure that prevails behind a post-filter which is connected downstream of the vacuum cleaner filter bag with respect to the direction of flow of the suction air, is supplied via the connecting piece l3 to the lower subspace l5 enclosed by the lower housing part 3 and the membrane 4.
  • the membrane 4 is thus directed towards the lower sub-space l5 in accordance with the pressure difference between the pressure prevailing in front of the vacuum cleaner filter bag and the pressure behind the post-filter of a vacuum cleaner.
  • the actuator 8 has a stop edge 16 which forms a start stop.
  • the force of the tension spring 11 causes the actuator 8 to rest against the blocking element 5 with its stop edge l6.
  • the outer contour of the actuator 8 follows the stop edge l6 with respect to the axis l7 of the actuator 8 lying in the direction of the display movement (arrow 25) in a line l8 continuously increasing towards the outside.
  • the outer contour of the actuator 8 initially runs parallel to the axis l7 of the actuator 8 in a first axial region l9 adjoining the stop edge l6.
  • the outer contour of the actuator runs in the second axial region 20 adjoining the first axial region l9 8 then again in a line l8 continuously increasing towards the outside.
  • the height 2l ie the effective length of the stop edge l6, must be dimensioned accordingly.
  • the height 2l of the stop edge is therefore chosen so that it corresponds to the deflection of the membrane 4 and thus the corresponding adjustment of the blocking element 5, which results from the prevailing pressure difference due to the unfilled, ie new, vacuum cleaner filter bag, and a degree of contamination of the secondary filter, which makes it seem necessary to replace it. Since after a replacement of the vacuum cleaner filter bag, the pressure drop in the suction air flow caused by the contamination of the secondary filter acts on the display device by itself, this can be used to indicate the necessary replacement of the secondary filter.
  • the display device operates as follows: As already mentioned, the upper subspace 14 is supplied with the ambient pressure or the pressure prevailing immediately in front of a filter bag inserted in the dust area of a vacuum cleaner. Since the lower sub-chamber l5 is acted upon by the low pressure prevailing behind the post-filter of a vacuum cleaner, the pressure difference between the two sub-chambers l4 and l5 causes the diaphragm 4 to deflect toward the lower sub-chamber l5. As a result, the blocking element 5 coupled to the membrane 4 is also moved accordingly.
  • the actuator 8 bears against the blocking element 5 with its stop edge 16 under the force of the tension spring 11. If the vacuum cleaner filter bag and / or secondary filter is not yet dirty, the display device initially remains in this starting position 22 until a pressure difference arises due to increasing contamination of the filter bag and secondary filter, by means of which the membrane 4 is deflected by a distance corresponding to the height 2l of the stop edge 16. Thereby the blocking element 5 is pulled away in front of the stop edge l6.
  • the pressure difference increases, so that the membrane 4 is deflected more and more.
  • the actuator 8 is released for its display movement.
  • the pointer 23 thereby moves further in the display area 27 of the scale 24. Since there is self-locking between the blocking element 5 and the actuator 8, the pointer 23 remains even when the pressure difference disappears, i.e. in idle mode of the vacuum cleaner, in the position reached so that the degree of contamination of the filter used in the vacuum cleaner and thus the corresponding loss of suction power of the vacuum cleaner can be seen at any time.
  • the operation of the vacuum cleaner after replacing a filled filter bag with a new filter bag the pressure difference due to the contamination of the post-filter will be so great that the membrane 4 immediately after changing the filter bag by one height 2l the distance corresponding to the stop edge l6 is deflected.
  • the pointer 23 of the display device therefore immediately leaves its starting position during a suction operation following the change of the filter bag 22 and moves immediately into the display area 27 of the scale 24. This is the sign for the user that the post-filter has reached or exceeded the permissible degree of contamination and a change is advisable.
  • the embodiment of the actuator 8 for the pointer 23 shown in FIG. 2 achieves a more noticeable, abrupt display movement of the pointer 23 when an exchange of the post-filter is signaled. This results from the parallel course of the outer contour of the actuator 8 in the first axial region l9 adjoining the stop edge l6. If the blocking element 5 is deflected by the height 2l of the stop edge l6 at the corresponding pressure difference, the actuator 8 can be adjusted in the direction of arrow 25 by the length of the parallel profile of the outer contour. Thus, the pointer 23 jumps from its starting position 22 to the display area 27 of the scale 24 which is offset from the starting position 22. Thereafter, as in the embodiment of the actuator 8 shown in FIG .
  • the actuator 8 When changing the filter bag, the actuator 8 must be returned to its starting position against the force of the tension spring II. Such a reset can expediently take place via a reset device actuated when the dust chamber cover is opened. This ensures that a reset when changing the filter is not overlooked.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Description

Die Erfindung betrifft eine Anzeigevorrichtung gemäß dem Oberbegriff des Anspruches l.The invention relates to a display device according to the preamble of claim 1.

Eine solche Anzeigevorrichtung ist durch die DE-A-33 00 250 bekannt. Bei dieser Vorrichtung ist ein als Anzeigeelement dienendes Teil mit einer durch den am Staubsaugerfilterbeutel auftretenden Differenzdruck beaufschlagten Membran gekoppelt. Das Anzeigeelement wird somit entsprechend der Auslenkung der Membran verstellt. Um das Anzeigeelement in der jeweils erreichten Anzeigestellung zu blockieren, ist ein durch Federkraft verstellbarer Keil verschiebbar im Gehäuse der Vorrichtung angeordnet, der bei einer entsprechenden Verstellung des Anzeigeelementes unter das Ende eines mit dem Anzeigeelement verbundenen Achsstückes geschoben wird. Damit verbleibt das Anzeigeelement nach einer Verminderung der Druckdifferenz jeweils in der zuvor bei einer größeren Druckdifferenz erreichten Stellung. Mit zunehmendem Füllgrad des Filterbeutels wird die auftretende Druckdifferenz entsprechend größer und das Anzeigeelement durch die Membran immer weiter verstellt, bis es schließlich durch eine Schlitzmembran hindurchtritt und dann von außen wahrgenommen werden kann. Dies ist dann das Signal für einen notwendigen Wechsel des Filterbeutels.Such a display device is known from DE-A-33 00 250. In this device, a part serving as a display element is coupled to a membrane acted upon by the differential pressure occurring on the vacuum cleaner filter bag. The display element is thus adjusted according to the deflection of the membrane. In order to block the display element in the display position reached in each case, a wedge which can be adjusted by spring force is arranged displaceably in the housing of the device and, when the display element is correspondingly adjusted, is pushed under the end of an axle piece connected to the display element. After a reduction in the pressure difference, the display element thus remains in the position previously reached with a larger pressure difference. With an increasing degree of filling of the filter bag, the pressure difference that arises is correspondingly larger and the display element is adjusted further and further through the membrane until it finally passes through a slit membrane and can then be perceived from the outside. This is then the signal for a necessary change of the filter bag.

Zur Verbesserung der Filterwirkung ist es bekannt (DE-B-24 54 748), die aus dem Filterbeutel austretende Saugluft nochmals durch ein Nachfilter hindurchzuführen. Um die volle Filterwirkung zu erhalten, muß die Verschmutzung eines solchen Nachfilters von Zeit zu Zeit kontrolliert und das Nachfilter gegebenenfalls ausgetauscht werden.To improve the filter effect, it is known (DE-B-24 54 748) to pass the suction air emerging from the filter bag again through a secondary filter. In order to obtain the full filter effect, the contamination of such a post-filter must be checked from time to time and the post-filter replaced if necessary.

Zwei mögliche Konstruktionen von Anzeigevorrichtungen, die den Filterwechsel signalisieren, sind in den Dokumenten DE-A-360 ll73 und US-A-2ll7368 beschrieben.Two possible constructions of display devices which signal the filter change are described in documents DE-A-360 ll73 and US-A-2ll7368.

Aufgabe der Erfindung ist es, mittels einer den Verschmutzungsgrad des Filterbeutels meldenden Anzeigevorrichtung auch den notwendigen Wechsel eines im Staubsauger vorgesehenen Nachfilters zu signalisieren.The object of the invention is to signal the necessary change of a post-filter provided in the vacuum cleaner by means of a display device reporting the degree of contamination of the filter bag.

Diese Aufgabe wird durch die im Kennzeichen des Anspruches l angegebenen Merkmale gelöst. Durch die Anlage des Stellgliedes an dem mit dem Verstellglied gekoppelten Blockierelement wird erreicht, daß ein mit dem Stellglied gekoppeltes Anzeigeelement nach einem Wechsel des Staubsaugerfilterbeutels eine eindeutige Startstellung, d.h. Null-Stellung einnimmt. Durch die entsprechende Bemessung der wirksamen Länge des Startanschlages in bezug auf einen bestimmten Verschmutzungsgrad des Nachfilters, d.h. den einen Wechsel des Nachfilters ratsam erscheinen lassenden Verschmutzungsgrad, wird erreicht, daß nach einem Austausch des Staubsaugerfilterbeutels die Anzeigevorrichtung beim nächsten auf den Filterbeutelaustausch folgenden Saugvorgang nicht die Startstellung einnimmt, wenn das Nachfilter den vorbestimmten Verschmutzungsgrad erreicht oder überschritten hat. In diesem Falle ist die am Verstellglied der Anzeigevorrichtung auftretende Druckdifferenz so groß, daß die Verstellung des Blockiergliedes größer als die wirksame Länge des Startanschlages ist, so daß das Stellglied des Anzeigeelementes sofort für eine Anzeigebewegung freigegeben wird. Dies ist für den Benutzer des Staubsauger das Signal, daß ein Wechsel des Nachfilters notwendig ist, um einerseits die gewünschte, gute Filterwirkung zu erreichen und andererseits eine Verminderung der Saugleistung des Staubsaugers zu vermeiden.This object is achieved by the features specified in the characterizing part of claim 1. By positioning the actuator on the blocking element coupled to the adjusting element, it is achieved that a display element coupled to the actuator has a clear starting position after changing the vacuum cleaner filter bag, i.e. Assumes zero position. By appropriate dimensioning of the effective length of the start stop in relation to a certain degree of contamination of the secondary filter, i.e. The change in the degree of contamination, which makes it advisable to change the post-filter, is achieved in that after an exchange of the vacuum cleaner filter bag, the display device does not assume the starting position the next time the filter bag is replaced, if the post-filter has reached or exceeded the predetermined degree of contamination. In this case, the pressure difference occurring at the adjusting member of the display device is so great that the adjustment of the blocking member is greater than the effective length of the start stop, so that the actuator of the display element is immediately released for a display movement. For the user of the vacuum cleaner, this is the signal that a change of the post-filter is necessary in order to achieve the desired good filter effect on the one hand and to avoid a reduction in the suction power of the vacuum cleaner on the other hand.

Konstruktiv vorteilhafte Ausführungsformen der Anzeigevorrichtung sind in den Unteransprüchen beschrieben. Besonders vorteilhaft ist es, als Verstellglied eine in einem Membrangehäuse eingespannte Membran vorzusehen. Durch die Gestaltung der Außenkontur des Stellgliedes des Anzeigeelementes kann die Anzeigecharakteristik der Vorrichtung beeinflußt werden. Ein die Notwendigkeit des Wechsels des Nachfilters besonders deutlich signalisierender Anzeigesprung des Anzeigeelementes gegenüber seiner Startstellung wird durch die Merkmale des Anspruches 7 erreicht. Durch den parallelen Verlauf der Außenkontur des Stellgliedes in dem ersten Axialbereich wird das Anzeigeelement entsprechend der Länge des parallelen Verlaufes sprunghaft gegenüber der Startstellung verstellt. Dies ist ein besonders deutliches Signal für den Benutzer des Staubsaugers.Constructively advantageous embodiments of the display device are described in the subclaims. It is particularly advantageous to provide a diaphragm clamped in a diaphragm housing as the adjusting element. The display characteristic of the device can be influenced by the design of the outer contour of the actuator of the display element. The need to change the secondary filter is particularly clear Signaling display jump of the display element compared to its starting position is achieved by the features of claim 7. Due to the parallel course of the outer contour of the actuator in the first axial region, the display element is jumped relative to the starting position in accordance with the length of the parallel course. This is a particularly clear signal for the user of the vacuum cleaner.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispieles wird der Anmeldungsgegenstand nachfolgend näher beschrieben. Es zeigt:

  • FIG l eine Prinzipdarstellung einer Ausführungsform einer Anzeigevorrichtung;
  • FIG 2 eine Prinzipdarstellung einer weiteren Ausführungsform einer Anzeigevorrichtung.
The subject of the application is described in more detail below using an exemplary embodiment shown in the drawing. It shows:
  • 1 shows a basic illustration of an embodiment of a display device;
  • 2 shows a schematic diagram of a further embodiment of a display device.

Mit l ist das aus einem oberen und unteren Gehäuseteil 2 und 3 bestehende Gehäuse einer Anzeigevorrichtung, die in das Gehäuse eines Staubsaugers einbaubar ist, bezeichnet. Zwischen den beiden Gehäuseteilen 2 und 3 ist eine Membran 4 eingespannt, mit der ein Blockierelement 5 fest verbunden ist. Das Blockierelement 5 ragt in den Verstellweg eines an zwei Lagerstellen 6 und 7 im oberen Gehäuseteil 2 beweglich geführten Stellgliedes 8. Der Antrieb des Stellgliedes 8 erfolgt durch eine mit ihrem einen Ende 9 an dem Stellglied 8 und mit ihrem anderen Ende l0 an der Gehäusewand des oberen Gehäuseteiles 2 befestigten Zugfeder ll. In analoger Weise könnte der Antrieb des Stellgliedes auch über eine Druckfeder erfolgen.With the housing consisting of an upper and lower housing parts 2 and 3 of a display device, which can be installed in the housing of a vacuum cleaner, is designated. A membrane 4 is clamped between the two housing parts 2 and 3, with which a blocking element 5 is firmly connected. The blocking element 5 protrudes into the adjustment path of an actuator 8 which is movably guided at two bearings 6 and 7 in the upper housing part 2. The actuator 8 is driven by one end 9 of the actuator 8 and the other end l0 of the housing wall of the actuator 8 upper housing part 2 attached tension spring ll. In an analogous manner, the actuator could also be driven by a compression spring.

Über Anschlußstutzen l2 und l3 können die jeweils durch die beiden Gehäuseteile 2 und 3 und die Membran 4 umgrenzten Teilräume l4 und l5 mit unterschiedlichen Drücken beaufschlagt werden. So wird über den Anschlußstutzen l2 der durch den oberen Gehäuseteil 2 und die Membran 4 umgrenzte obere Teilraum l4 mit dem Umgebungsdruck oder mit dem unmittelbar vor einem im Staubraum eines Staubsaugers eingesetzten Staubsaugerfilterbeutel herrschenden Druck beaufschlagt. Über den Anschlußstutzen l3 wird dagegen dem durch den unteren Gehäuseteil 3 und die Membran 4 umschlossenen unteren Teilraum l5 der Druck zugeführt, der hinter einem Nachfilter herrscht, welches in bezug auf die Strömungsrichtung der Saugluft dem Staubsaugerfilterbeutel nachgeschaltet ist. Die Membran 4 wird somit entsprechend der Druckdifferenz, die zwischen dem vor dem Staubsaugerfilterbeutel und dem hinter dem Nachfilter eines Staubsaugers herrschenden Druck besteht, zum unteren Teilraum l5 hinausgelenkt.Via connecting pieces l2 and l3, the subspaces l4 and l5, each delimited by the two housing parts 2 and 3 and the membrane 4, can be subjected to different pressures. Thus, the upper sub-space l4 delimited by the upper housing part 2 and the membrane 4 is connected via the connecting piece l2 with the ambient pressure or with the pressure prevailing immediately in front of a vacuum cleaner filter bag used in the dust chamber of a vacuum cleaner. On the other hand, the pressure that prevails behind a post-filter, which is connected downstream of the vacuum cleaner filter bag with respect to the direction of flow of the suction air, is supplied via the connecting piece l3 to the lower subspace l5 enclosed by the lower housing part 3 and the membrane 4. The membrane 4 is thus directed towards the lower sub-space l5 in accordance with the pressure difference between the pressure prevailing in front of the vacuum cleaner filter bag and the pressure behind the post-filter of a vacuum cleaner.

Wie aus der Darstellung in den FIG l und 2 zu erkennen ist, weist das Stellglied 8 eine Anschlagkante l6 auf, die einen Startanschlag bildet. Durch die Kraft der Zugfeder ll liegt das Stellglied 8 mit seiner Anschlagkante l6 an dem Blockierelement 5 an. Gemäß der Darstellung in FIG l verläuft die Außenkontur des Stellgliedes 8 im Anschluß an die Anschlagkante l6 in bezug auf die in Richtung der Anzeigebewegung (Pfeil 25) liegende Achse l7 des Stellgliedes 8 in einer nach außen kontinuierlich ansteigenden Linie l8.As can be seen from the illustration in FIGS. 1 and 2, the actuator 8 has a stop edge 16 which forms a start stop. The force of the tension spring 11 causes the actuator 8 to rest against the blocking element 5 with its stop edge l6. According to the representation in FIG. 1, the outer contour of the actuator 8 follows the stop edge l6 with respect to the axis l7 of the actuator 8 lying in the direction of the display movement (arrow 25) in a line l8 continuously increasing towards the outside.

Bei der in FIG 2 dargestellten Ausführungsform der Anzeigevorrichtung verläuft die Außenkontur des Stellgliedes 8 in einem an die Anschlagkante l6 anschließenden ersten Axialbereich l9 zunächst parallel zur Achse l7 des Stellgliedes 8. In dem an den ersten Axialbereich l9 anschließenden zweiten Axialbereich 20 verläuft die Außenkontur des Stellgliedes 8 dann wieder in einer nach außen kontinuierlich ansteigenden Linie l8.In the embodiment of the display device shown in FIG. 2, the outer contour of the actuator 8 initially runs parallel to the axis l7 of the actuator 8 in a first axial region l9 adjoining the stop edge l6. The outer contour of the actuator runs in the second axial region 20 adjoining the first axial region l9 8 then again in a line l8 continuously increasing towards the outside.

Um über die Anzeigevorrichtung beim Erreichen eines bestimmten Verschmutzungsgrades des Nachfilters eine den notwendigen Wechsel desselben signalisierende Anzeige zu erhalten, muß die Höhe 2l, d.h. die wirksame Länge der Anschlagkante l6, entsprechend bemessen werden. Die Höhe 2l der Anschlagkante ist daher so gewählt, daß sie dem Auslenkweg der Membran 4 und damit dem entsprechenden Verstellweg des Blockierelementes 5 entspricht, der sich durch die bei ungefülltem, d.h. neuem Staubsaugerfilterbeutel, und einem Verschmutzungsgrad des Nachfilters, der einen Austausch desselben notwendig erscheinen läßt, herrschende Druckdifferenz ergibt. Da nach einem Austausch des Staubsaugerfilterbeutels der durch die Verschmutzung des Nachfilters hervorgerufene Druckabfall des Saugluftstromes für sich alleine auf die Anzeigevorrichtung wirkt, kann dies für die Anzeige des notwendigen Austausches des Nachfilters genutzt werden.In order to obtain a necessary signal for the change of the secondary filter via the display device when the post-filter reaches a certain degree of contamination, the height 2l, ie the effective length of the stop edge l6, must be dimensioned accordingly. The height 2l of the stop edge is therefore chosen so that it corresponds to the deflection of the membrane 4 and thus the corresponding adjustment of the blocking element 5, which results from the prevailing pressure difference due to the unfilled, ie new, vacuum cleaner filter bag, and a degree of contamination of the secondary filter, which makes it seem necessary to replace it. Since after a replacement of the vacuum cleaner filter bag, the pressure drop in the suction air flow caused by the contamination of the secondary filter acts on the display device by itself, this can be used to indicate the necessary replacement of the secondary filter.

Die Anzeigevorrichtung arbeitet wie folgt: Über den Anschlußstutzen l2 wird der obere Teilraum l4, wie bereits erwähnt, mit dem Umgebungsdruck oder dem unmittelbar vor einem in den Staubraum eines Staubsaugers eingesetzten Filterbeutel herrschenden Druck beaufschlagt. Da der untere Teilraum l5 mit dem hinter dem Nachfilter eines Staubsaugers herrschenden niederen Druck beaufschlagt wird, erfolgt durch die zwischen den beiden Teilräumen l4 und l5 bestehende Druckdifferenz eine Auslenkung der Membran 4 zum unteren Teilraum l5 hin. Hierdurch wird auch das mit der Membran 4 gekoppelte Blockierelement 5 entsprechend mitbewegt.The display device operates as follows: As already mentioned, the upper subspace 14 is supplied with the ambient pressure or the pressure prevailing immediately in front of a filter bag inserted in the dust area of a vacuum cleaner. Since the lower sub-chamber l5 is acted upon by the low pressure prevailing behind the post-filter of a vacuum cleaner, the pressure difference between the two sub-chambers l4 and l5 causes the diaphragm 4 to deflect toward the lower sub-chamber l5. As a result, the blocking element 5 coupled to the membrane 4 is also moved accordingly.

In der Startstellung 22, die beispielsweise über einen mit dem Stellglied 8 als Anzeigeelement verbundenen Zeiger 23 an einer Skala 24 angezeigt wird, liegt das Stellglied 8 mit seiner Anschlagkante l6 unter der Kraft der Zugfeder ll an dem Blockierelement 5 an. Bei noch nicht verschmutztem Staubsaugerfilterbeutel und/oder Nachfilter verharrt die Anzeigevorrichtung zunächst in dieser Startstellung 22 bis durch zunehmende Verschmutzung des Filterbeutels und Nachfilters eine Druckdifferenz entsteht, durch die die Membran 4 um eine der Höhe 2l der Anschlagkante l6 entsprechende Strecke ausgelenkt wird. Dadurch wird das Blockierelement 5 vor der Anschlagkante l6 weggezogen. Damit ist die Startblockierung des Stellgliedes 8 aufgehoben und dieses kann nunmehr durch die Zugfeder ll in der durch einen Pfeil 25 gekennzeichneten Anzeigerichtung bewegt werden, bis es mit seiner Außenkontur (Linie l8) gegen die Stirnseite 26 des Blockierelementes 5 stößt. Über den mit dem Stellglied 8 gekoppelten Zeiger 23 wird die entsprechende Bewegung des Stellgliedes 8 an der Skala 24 angezeigt. Die Kraft der Zugfeder ll und die Steilheit der Außenkontur, d.h. der Linie l8, sind im Hinblick auf die zwischen dem Blockierelement 5 und dem Stellglied 8 bestehende Reibung so aufeinander abgestimmt, daß keine Rückwirkungen auf die Auslenkung der Membran 4 auftreten.In the starting position 22, which is displayed on a scale 24, for example via a pointer 23 connected to the actuator 8 as a display element, the actuator 8 bears against the blocking element 5 with its stop edge 16 under the force of the tension spring 11. If the vacuum cleaner filter bag and / or secondary filter is not yet dirty, the display device initially remains in this starting position 22 until a pressure difference arises due to increasing contamination of the filter bag and secondary filter, by means of which the membrane 4 is deflected by a distance corresponding to the height 2l of the stop edge 16. Thereby the blocking element 5 is pulled away in front of the stop edge l6. This blocks the start blocking of the actuator 8 and this can now be moved by the tension spring 11 in the display direction indicated by an arrow 25 until its outer contour (line 18) abuts the end face 26 of the blocking element 5. The corresponding movement of the actuator 8 is indicated on the scale 24 via the pointer 23 coupled to the actuator 8. The force of the tension spring 11 and the steepness of the outer contour, ie the line 18, are coordinated with one another with regard to the friction existing between the blocking element 5 and the actuator 8 in such a way that no effects on the deflection of the diaphragm 4 occur.

Mit zunehmender Füllung des Filterbeutels und zunehmender Verschmutzung des Nachfilters steigt die Druckdifferenz, so daß die Membran 4 immer weiter ausgelenkt wird. Hierdurch wird das Stellglied 8 weiter für seine Anzeigebewegung freigegeben. Der Zeiger 23 bewegt sich dadurch in dem Anzeigebereich 27 der Skala 24 weiter. Da zwischen dem Blockierelement 5 und dem Stellglied 8 Selbsthemmung besteht, verbleibt der Zeiger 23 auch beim Verschwinden der Druckdifferenz, d.h. im Ruhebetrieb des Staubsaugers, in der jeweils erreichten Stellung, so daß jederzeit der Verschmutzungsgrad der im Staubsauger eingesetzten Filter und damit auch der entsprechende Verlust an Saugleistung des Staubsaugers erkennbar ist.With increasing filling of the filter bag and increasing contamination of the secondary filter, the pressure difference increases, so that the membrane 4 is deflected more and more. As a result, the actuator 8 is released for its display movement. The pointer 23 thereby moves further in the display area 27 of the scale 24. Since there is self-locking between the blocking element 5 and the actuator 8, the pointer 23 remains even when the pressure difference disappears, i.e. in idle mode of the vacuum cleaner, in the position reached so that the degree of contamination of the filter used in the vacuum cleaner and thus the corresponding loss of suction power of the vacuum cleaner can be seen at any time.

Hat das Nachfilter den vorbestimmten Verschmutzungsgrad erreicht, so wird beim Betrieb des Staubsaugers nach einem Austausch eines gefüllten Filterbeutels gegen einen neuen Filterbeutel die durch die Verschmutzung des Nachfilters bedingte Druckdifferenz so groß sein, daß die Membran 4 nach dem Wechsel des Filterbeutels sofort um eine der Höhe 2l der Anschlagkante l6 entsprechende Strecke ausgelenkt wird. Der Zeiger 23 der Anzeigevorrichtung verläßt daher sofort bei einem auf den Wechsel des Filterbeutels folgenden Saugvorgang seine Startstellung 22 und bewegt sich gleich in den Anzeigebereich 27 der Skala 24. Dies ist für den Benutzer das Zeichen, daß das Nachfilter den zulässigen Verschmutzungsgrad erreicht bzw. überschritten hat und ein Wechsel ratsam ist.Has the post-filter reached the predetermined degree of contamination, the operation of the vacuum cleaner after replacing a filled filter bag with a new filter bag, the pressure difference due to the contamination of the post-filter will be so great that the membrane 4 immediately after changing the filter bag by one height 2l the distance corresponding to the stop edge l6 is deflected. The pointer 23 of the display device therefore immediately leaves its starting position during a suction operation following the change of the filter bag 22 and moves immediately into the display area 27 of the scale 24. This is the sign for the user that the post-filter has reached or exceeded the permissible degree of contamination and a change is advisable.

Durch die in FIG 2 gezeigte Ausführungsform des Stellgliedes 8 für den Zeiger 23 wird eine besser wahrnehmbare, sprunghafte Anzeigebewegung des Zeigers 23 bei der Signalisierung eines Austausches des Nachfilters erreicht. Dies ergibt sich durch den parallelen Verlauf der Außenkontur des Stellgliedes 8 in dem an die Anschlagkante l6 anschließenden ersten Axialbereich l9. Wird das Blockierelement 5 bei der entsprechenden Druckdifferenz um die Höhe 2l der Anschlagkante l6 ausgelenkt, so kann das Stellglied 8 gleich um die Länge des parallelen Verlaufes der Außenkontur in Richtung des Pfeiles 25 verstellt werden. Damit springt der Zeiger 23 von seiner Startstellung 22 zu dem von der Startstellung 22 abgesetzten Anzeigebereich 27 der Skala 24. Danach wird dieser Anzeigebereich 27 wie bei der in Fig. l dargestellten Ausführungsform des Stellgliedes 8 entsprechend der zunehmenden Füllung des Filterbeutels und Verschmutzung des Nachfilters durchlaufen.The embodiment of the actuator 8 for the pointer 23 shown in FIG. 2 achieves a more noticeable, abrupt display movement of the pointer 23 when an exchange of the post-filter is signaled. This results from the parallel course of the outer contour of the actuator 8 in the first axial region l9 adjoining the stop edge l6. If the blocking element 5 is deflected by the height 2l of the stop edge l6 at the corresponding pressure difference, the actuator 8 can be adjusted in the direction of arrow 25 by the length of the parallel profile of the outer contour. Thus, the pointer 23 jumps from its starting position 22 to the display area 27 of the scale 24 which is offset from the starting position 22. Thereafter, as in the embodiment of the actuator 8 shown in FIG .

Bei einem Wechsel des Filterbeutels muß das Stellglied 8 wieder in seine Ausgangsstellung gegen die Kraft der Zugfeder ll zurückgestellt werden. Eine solche Rückstellung kann zweckmäßigerweise über eine beim Öffnen des Staubraumdeckels betätigte Rückstellvorrichtung erfolgen. Dadurch ist sichergestellt, daß eine Rückstellung beim Filterwechsel nicht übersehen wird.When changing the filter bag, the actuator 8 must be returned to its starting position against the force of the tension spring II. Such a reset can expediently take place via a reset device actuated when the dust chamber cover is opened. This ensures that a reset when changing the filter is not overlooked.

Claims (8)

  1. Display device on a vacuum cleaner for recognizing the degree of soiling of at least one dust filter arranged in the vacuum cleaner, which device has a displacing element (4) loaded by the pressure difference occurring at the dust filter, and an adjusting element (8) coupled to a display element (23), which adjusting element (8) can be moved in the display direction by means of force action in dependence upon the displacing movement of the displacing element (4) and is held by a blocking element (5) in the display position respectively reached, characterized in that the blocking element (5) is coupled to the displacing element (4) and the adjusting element (8) of the display element (23), in its starting position, abuts the blocking element (5), with a start limit-stop (limit-stop edge 16) whereby the effective length (21) of the start limit-stop (16) is equal to the displacing path of the blocking element (5), resulting due to a pressure difference generated only by a predetermined degree of soiling of an additional dust filter arranged in the vacuum cleaner as a subsequent filter.
  2. Device according to claim 1, characterized in that a diaphragm (4) clamped in a housing (1) is provided as displacing element, on which the blocking element (5) is arranged, which can be displaced at right angles to the movement path of the adjusting element (8) through the diaphragm (4) and which controls the movement of the adjusting element (8) in the display direction by means of its transverse movement.
  3. Device according to claim 1 and 2, characterized in that the start limit-stop is constructed as a limit-stop edge (16) extending parallel to the transverse movement of the blocking element (5), the height (21) of the limit-stop edge being equal to the displacing path of the diaphragm (4) at the specified degree of soiling of the subsequent filter, in that in connection with the limit-stop edge (16) the outer contour of the adjusting element (8) extends so that it rises to the outside opposite its axis (17) lying in the direction of the display movement (arrow 25).
  4. Device according to claim 3, characterized in that the outer contour extends so that it rises in a continuous line (18).
  5. Device according to claim 4, characterized in that the outer contour extends so that it rises in a straight line.
  6. Device according to claim 4, characterized in that the outer contour extends in a curved line.
  7. Device according to claim 1 and 2, characterized in that the start limit-stop is constructed as a limit-stop edge (16) extending parallel to the transverse movement of the blocking element (5), the height (21) of the limit stop edge being equal to the displacing path of the diaphragm (4) at the certain degree of soiling of the subsequent filter, in that in connection with the limit stop edge (16) the outer contour of the adjusting element (8) extends in a first axial region (19) parallel to the axis (17) of the adjusting element (8) which lies in the direction of the display movement (arrow 25), and in a second axial region (20) subsequent to the first axial region (19) extends so that it rises to the outside to this axis (17).
  8. Device according to one or more of the preceding claims, characterized in that the adjusting element (8) can be moved by spring tension in the display direction (arrow 25).
EP19890106181 1989-04-07 1989-04-07 Signalling device on a vacuum cleaner for monitoring the extent of soiling of at least one dust filter contained in the vacuum cleaner Expired - Lifetime EP0390956B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19890106181 EP0390956B1 (en) 1989-04-07 1989-04-07 Signalling device on a vacuum cleaner for monitoring the extent of soiling of at least one dust filter contained in the vacuum cleaner
DE8989106181T DE58902302D1 (en) 1989-04-07 1989-04-07 DISPLAY DEVICE ON A VACUUM CLEANER FOR DETECTING THE DEGREE OF POLLUTION AT LEAST ONE DIRT FILTER IN THE VACUUM CLEANER.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19890106181 EP0390956B1 (en) 1989-04-07 1989-04-07 Signalling device on a vacuum cleaner for monitoring the extent of soiling of at least one dust filter contained in the vacuum cleaner

Publications (2)

Publication Number Publication Date
EP0390956A1 EP0390956A1 (en) 1990-10-10
EP0390956B1 true EP0390956B1 (en) 1992-09-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890106181 Expired - Lifetime EP0390956B1 (en) 1989-04-07 1989-04-07 Signalling device on a vacuum cleaner for monitoring the extent of soiling of at least one dust filter contained in the vacuum cleaner

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Country Link
EP (1) EP0390956B1 (en)
DE (1) DE58902302D1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0755215A4 (en) * 1994-04-11 1997-05-02 Goyen Controls Co Components for and methods of operation of bag house filter/cartridge cleaning systems
US7303613B2 (en) * 2003-12-11 2007-12-04 Euro-Pro Operating, Llc Filter sensor and indicator for vacuum cleaners
CN112294191B (en) * 2019-08-01 2022-05-06 尚科宁家(中国)科技有限公司 Dirt blockage detection method for dust box filter screen of sweeper and sweeper

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2117368A (en) * 1935-11-09 1938-05-17 Hoover Co Suction cleaner
US2325188A (en) * 1940-12-06 1943-07-27 Electrolux Corp Vacuum cleaner
DE2454748C3 (en) * 1974-11-19 1978-12-14 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arrangement of a post-filter in a vacuum cleaner
DE3300250C2 (en) * 1983-01-05 1985-10-31 Siemens AG, 1000 Berlin und 8000 München Display device for the filling level of a vacuum cleaner filter bag
DE3601173A1 (en) * 1986-01-17 1987-07-30 Vorwerk Co Interholding Filter-change indicating device on vacuum cleaners

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DE58902302D1 (en) 1992-10-22
EP0390956A1 (en) 1990-10-10

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