DE102017102466A1 - Suction nozzle with ground adjustment - Google Patents

Abstract

The invention relates to a suction nozzle (1) for a vacuum cleaner (3) for cleaning a floor, with a housing (2), with a first suction mouth (4) formed in the housing (2), with a suction space formed in the housing (2) ( 6), with a suction channel (8) formed in the housing (2), with a rotatable brush roller (10), wherein the brush roller (10) has a roller body (12) and filaments (14), wherein the suction space (6) over the first suction port (4) is fluidically connected to the environment of the suction nozzle (1) and wherein the suction channel (8) in the suction chamber (6) opens. The technical problem to provide a suction nozzle with which both hard floors and carpets can be cleaned in a reliable and comfortable manner is achieved according to a first teaching that the penetration depth of the brush roller (10) in a floor to be cleaned by at least one adjustment ( 16) is variable, that at least one measuring means (18) for measuring the pressure in the suction chamber (6) is arranged and that a control means (20) the adjusting means (16) of the brush roller (10) in dependence of the measuring means (18) measured Changed pressure. Further, the technical problem is solved according to a second teaching in that at least one measuring means (18) for measuring the pressure in the suction chamber (6) is arranged, that in the housing (2) at least one secondary air opening (22) is formed and that a control means (20) the size of the secondary air opening (22) by at least one adjusting means (24) as a function of the measured by the measuring means (18) measured pressure in the suction chamber (6). Further, the technical problem is solved by two methods of operating a suction nozzle (1).

Description

The invention relates to a suction nozzle for a vacuum cleaner for cleaning a floor, with a housing, with a housing formed in the first suction mouth, formed with a suction chamber formed in the housing, with a suction channel formed in the housing and with a rotatable brush roller, wherein the brush roller a roller body and Having filaments, wherein the suction chamber is fluidly connected via the first suction mouth with the environment of the suction nozzle and wherein the suction channel opens into the suction chamber. Furthermore, the invention relates to two methods for operating a suction nozzle.

Suction nozzles are as attachments, which are referred to as Hartbodendüsen or electric brushes depending on the purpose, typically via a flexible suction hose and / or a handling tube fluidly connected to the vacuum cleaner. In so-called hand vacuum cleaners, the suction nozzle can also be connected directly flow-tight with the main body of the vacuum cleaner. The suction nozzles in question here have a rotating brush roller which has a roller body and a plurality of filaments, in particular bristles, arranged thereon. The filaments may be in the form of individual tufts or in the form of brush strips, i. H. Rows of juxtaposed filaments to be provided on the roll body. By rotation of the brush roller and simultaneous generation of a suction air flow from the suction mouth via the suction chamber to the suction channel, particles detached from the bottom (dust and / or dirt particles) can be picked up and entrained by the air flow.

In particular, a brush roller, which is arranged within the suction chamber in such a way that it can contact the ground and brush it during the suction operation, ie when the brush roll is resting on a floor to be sucked, is frequently used to improve the cleaning of the floor. In this case, the soil is typically brushed by means of a rotation of the brush roller, which leads to an additional dissolution of dirt from the soil. The use of such a brush roller is particularly useful when vacuuming carpets.

The suction nozzles known from the prior art often have no possibility to adjust the brush roller as a function of the substrate to be processed. This leads in practice to the fact that the brush roller is heavily loaded when cleaning a carpet, in particular a high-pile carpet. Because the penetrating into the suction mouth fibers of the carpet brake the rotating brush from very strong and clog the Einsaugspalt, which is located between the brush roller and the boundary of the suction mouth. The clogging of the Einsaugspalts by fibers of a carpet to be cleaned, there is a reduction in the cross section of the Einsaugspalts. Since the pressure applied to the suction channel does not change, this leads to an increase of the negative pressure in the suction chamber, whereby the already located in the Einsaugung fibers of the carpet to be cleaned are sucked with increasing force in the suction of the suction nozzle.

Furthermore, by clogging the wicking gap with fibers of a carpet to be cleaned, the mechanical resistance acting on the brush roll, e.g. in particularly high-pile carpets. Because the fibers of the carpet to be cleaned are often entangled in the filaments of the brush roller, which must be provided by the drive of the brush roller increased power to maintain the desired speed. If an electric motor is used as the drive for rotating the brush roller, the current consumption of the electric motor increases sharply in such cases, which can lead to an overload condition. Addressing this problem by controlling the current drawn by the electric motor to a constant value could cause the brush roller to stop, ie stop rotating. This is not a viable option because the brush roller would then no longer fulfill its function of not only vacuuming but also brushing the floor.

From the DE 10 2015 105 173 A1 a suction nozzle for a vacuum cleaner with a brush roller is known, in which the penetration depth of the brush roller in dependence on the detected power consumption of the drive of the brush roller is controllable. A mere adaptation of the penetration depth of the brush roller on the basis of the current consumption of the drive of the brush roller has proven to be too inaccurate in practice, since fibers of a carpet to be cleaned can partially block the Einsaugspalt without the fibers exert an increased mechanical resistance to the brush roller.

In the DE 10 2008 010 334 A1 a suction nozzle with an elongated cleaning brush is disclosed, which can be driven completely in the housing (in carpets) or completely out of the housing (hard floors) depending on the voltage applied to the suction opening of the suction nozzle vacuum. The problem with this configuration is that the brush can no longer engage in engagement with a floor to be cleaned in a complete retraction and thus no adequate cleaning of the carpet can be guaranteed. Furthermore, the cleaning brush in question is not a previous one described brush roller, but rather a bristle strip, which is usually retracted during the cleaning of carpets.

Therefore, the present invention has the technical problem of providing a suction nozzle, with both hard floors and carpets can be cleaned in a reliable and comfortable manner.

The above-mentioned technical problem is solved according to the invention according to a first teaching, that the penetration depth of the brush roller is changed in a floor to be cleaned by at least one adjustment, that at least one measuring means for measuring the pressure in the suction chamber is arranged and that a control means, the adjustment of the Brush roller changed depending on the measured pressure of the measuring means. Thus, the penetration depth of the brush roller is reduced with an increase in the negative pressure, so that the negative pressure in the suction chamber is reduced, since the Einsaugspalt is clogged, for example, by fewer fibers of a carpet to be cleaned. In addition, the mechanical resistance acting on the brush roller is reduced. In the reverse manner, so if there is too little negative pressure in the suction chamber and thus no sufficient suction power can be built to absorb, for example, heavier coarse material, the penetration depth of the brush roller is increased. This in turn leads to an increase in the negative pressure in the suction chamber, since the Einsaugspalt then reduced again.

Preferably, the adjustment means changes the position of the brush roller relative to the housing. Here, the brush roller is mounted vertically adjustable in the suction port of the housing, so that the distance between the axis of rotation of the roller body of the brush roller is changeable from the ground. It is particularly preferred that the axis of rotation during the height adjustment remains substantially parallel to the ground. The distance of the housing to a floor to be cleaned is preferably not variable. Accordingly, when the brush roller is extended out of the housing, the penetration depth of the brush roller into a floor to be cleaned is increased. This is especially the case when the negative pressure in the suction chamber is too low, since the Einsaugspalt by a partially retracted brush roller has an enlarged cross-section. Upon retraction of the brush roller, the penetration depth of the brush roller is reduced in a floor to be cleaned. This is especially the case when the negative pressure in the suction chamber reaches too high a value. By raising the brush roller, the suction gap is increased and fewer fibers of a carpet reduce the cross section of the Einsaugspalts. In this case, the position of the brush roller through the adjustment can be made continuously or in defined stages.

Further, it is preferable that the adjusting means changes the position of the housing to a floor to be cleaned. Skids or support wheels are particularly preferably arranged on the underside of the housing, so that the distance of the entire housing can be changed by a floor to be cleaned. Preferably, the brush roller is mounted invariably in height in the housing. Accordingly, when the runners or the support wheels are retracted out of the housing, the penetration depth of the brush roller into a floor to be cleaned increases. When the runners or support wheels are extended, the penetration depth of the brush roller into a floor to be cleaned is reduced. This is especially the case when the negative pressure in the suction chamber reaches too high a value. Because by raising the housing less fibers of a carpet can reduce the Einsaugspalt. In this case, the entry and the extension of the runners or support wheels by the adjustment can be made continuously or in defined stages.

Further, the above-mentioned technical problem is solved by a vacuum cleaner according to the invention according to a second teaching that at least one measuring means for measuring the pressure in the suction chamber is arranged, that in the housing at least one secondary air opening is formed and that a control means by the size of the secondary air opening changed at least one adjusting means in dependence on the measured by a measuring means pressure in the suction chamber. By providing a secondary air opening can be ensured that the negative pressure in the suction chamber does not rise too much. For if fibers of a carpet reduce the suction and the pressure in the suction chamber increases too much, the control means may at least partially open the secondary air openings and thus provide for a reduction of the increased negative pressure in the suction chamber. Particularly preferably, the secondary air opening is formed as a second suction mouth and fluidly connected via a Nebensaugkanal with the suction channel. In this case, the second suction mouth is arranged on the underside of the housing, preferably in the direction of travel of the suction nozzle behind the first suction mouth. In this way, no energy generated by the vacuum cleaner is lost, but the branched suction air stream is also used for the absorption of particles, in particular fine dust.

Further, it is preferred that the control means changes both the adjusting means and the adjusting means as a function of the pressure measured by the measuring means. By the possibility in two ways, namely by the height adjustment the brush roller via the adjusting means and through the opening of the secondary air openings via the adjusting means to be able to respond to an excessive negative pressure in the suction chamber, the negative pressure in the suction chamber can be regulated more reliably.

Furthermore, it is preferred that an electric motor drives the brush roller and that the control means additionally changes the penetration depth of the brush roller as a function of the current consumption of the electric motor measured by a measuring device by taking into account two influencing variables, namely the measured pressure in the suction chamber and the current consumption of the Electric motor, can be determined with great certainty to what extent the penetration depth of the brush roller must be changed for optimum cleaning position. The current consumption of the electric motor serves as an indication of the mechanical resistance experienced by the brush roller by the wrapping of carpet fibers.

Furthermore, it is preferred that an electric motor drives the brush roller and the control means additionally changes the size of the secondary air opening as a function of the current consumption of the electric motor measured by a measuring device. As a result, the negative pressure in the suction chamber can be reliably adapted to the conditions of the soil to be cleaned.

According to a further embodiment of the suction nozzle, it is provided that the housing has an optical display which indicates optical signals based on the pressure in the suction chamber and / or the current consumption of the electric motor. In this way, a user can follow the relevant measured values of the suction nozzle depending on the soil to be cleaned. Preferably, the exact measured values (pressure and current consumption) are not indicated, but signal lights in red, yellow or green are formed, which can represent insufficient (red), sufficient (yellow) and optimal (green) suction power.

Preferably, the control means actuates the adjusting means and / or the adjusting means in dependence on the measured data automatically. In this way, a user does not have to actively engage in the suction to ensure optimum adjustment of the suction nozzle. As a result, the cleaning performance and ease of use of the suction nozzle according to the invention increase to a great extent. For this purpose, the control means preferably has a processor which regulates the adjusting means and / or the adjusting means by means of one of the two or both input variables (current consumption and / or negative pressure in the suction space).

According to a further alternative embodiment, it is also possible for a user to manually actuate the control means as a function of the data displayed by the optical display. In this embodiment, although the ease of use decreases, but also reduce the production costs and the susceptibility of the nozzle, which can lead to increased customer benefit.

Further, the technical problem mentioned above is achieved according to the invention by a method for operating a suction nozzle, wherein the pressure in the suction chamber is measured by a measuring means and in which the penetration depth of the brush roller by an adjusting means in dependence on the pressure measured in the suction chamber by the measuring means via a Control means is changed.

Furthermore, the technical problem mentioned above is achieved according to the invention by a method for operating a suction nozzle, wherein the pressure in the suction chamber is measured by a measuring means and wherein the size of the secondary air opening by at least one adjustment depending on the measured pressure in the suction chamber is changed via a control means.

Further preferred is a method with a suction nozzle according to the invention, in which the penetration depth of the brush roller by an adjustment and / or the size of the secondary air openings by an adjusting depending on the measured by a measuring means pressure in the suction chamber and / or in dependence of the measured current consumption of the electric motor a control means are changed. Preferably, the adjusting means and / or the adjusting means are automatically actuated in dependence on the measured data by a control means.

• 1 eine perspektivische Ansicht eines ersten Ausführungsbeispiels einer erfindungsgemäßen Saugdüse für einen Staubsauger,
• 2a eine schematische Schnittansicht des ersten Ausführungsbeispiels der erfindungsgemäßen Saugdüse mit ausgefahrener Bürstenwalze,
• 2b eine schematische Schnittansicht des ersten Ausführungsbeispiels der erfindungsgemäßen Saugdüse mit eingefahrener Bürstenwalze,
• 3 eine perspektivische Ansicht eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Saugdüse für einen Staubsauger,
• 4a eine schematische Schnittansicht des zweiten Ausführungsbeispiels der erfindungsgemäßen Saugdüse mit eingefahrenem Stützrad,
• 4b eine schematische Schnittansicht des zweiten Ausführungsbeispiels der erfindungsgemäßen Saugdüse mit ausgefahrenem Stützrad,
• 5 eine perspektivische Ansicht eines dritten Ausführungsbeispiels einer erfindungsgemäßen Saugdüse für einen Staubsauger und
• 6 eine schematische Schnittansicht des dritten Ausführungsbeispiels der erfindungsgemäßen Saugdüse.

In the following the invention will be explained by means of embodiments with reference to the drawing. In the drawing show

• 1 a perspective view of a first embodiment of a suction nozzle according to the invention for a vacuum cleaner,
• 2a a schematic sectional view of the first embodiment of the suction nozzle according to the invention with extended brush roll,
• 2 B a schematic sectional view of the first embodiment of the suction nozzle according to the invention with retracted brush roller,
• 3 a perspective view of a second embodiment of a suction nozzle according to the invention for a vacuum cleaner,
• 4a a schematic sectional view of the second embodiment of the suction nozzle according to the invention with retracted jockey wheel,
• 4b a schematic sectional view of the second embodiment of the suction nozzle according to the invention with extended support wheel,
• 5 a perspective view of a third embodiment of a suction nozzle according to the invention for a vacuum cleaner and
• 6 a schematic sectional view of the third embodiment of the suction nozzle according to the invention.

In the following description of the various embodiments according to the invention components and elements having the same function and the same mode of action are provided with the same reference numerals, even if the components and elements in the various embodiments in their dimension or shape may have differences.

1 shows a first embodiment of a trained as an attachment suction nozzle 1 for a vacuum cleaner to clean a floor. The suction nozzle 1 has a housing 2 in which a first suction mouth 4 , a suction room 6 and a suction channel 8th are formed. The suction room 6 is over the first suction mouth 4 with the environment of the suction nozzle 1 fluidically connected. The suction channel 8th flows into the suction chamber 6 and is thus above the suction chamber 6 also with the environment of the suction nozzle 1 fluidically connected.

Inside the suction chamber 6 is a brush roller 10 mounted, which is rotatable about a rotation axis X, ie during operation of the suction nozzle 1 , driven by an electric motor 26 , can rotate. The axis of rotation X runs here in the horizontal direction parallel to the ground.

In this case, the brush roller 10 a roll body 12 and a variety of filaments 14 , For example in the form of bristles, which on the roll body 12 are arranged and away from the roll body 12 extend radially outward. The filaments 14 are here as brush strips 14 formed, so as rows of juxtaposed filaments 14 , The brush strips 14 extend here, for example, parallel to the axis of rotation X from a first axial end to a second axial end of the roller body 12 ,

Here is the brush roller 10 height adjustable in the suction mouth 6 of the housing 2 stored so that the distance of the axis of rotation X of the roller body 12 the brush roller 10 from the ground by means of adjustment 16 is changeable. The axis of rotation X remains in the height adjustment substantially parallel to the ground. The adjusting means are one with the housing 2 arranged control means 20 connected so that they are operated by the tax means 20 can be operated.

Furthermore, the suction nozzle 1 one in the suction room 6 arranged measuring means 18, which the pressure in the suction chamber 6 measures. This measuring device 18 is doing with the control means 20 connected so that the control means 20 the adjustment means 16 can adjust based on the measured pressure. Thus, the height of the brush roller 10 changeable depending on the measured pressure.

In the 2a and 2 B are each schematic sectional views of the in 1 shown suction nozzle shown. It is in 2a the brush roller 10 shown in an extended state. It can be seen that the fibers 11 a carpet to be cleaned, the suction mouth 4 and the filaments 14 the roll body 12 clog, whereby no sufficient cleaning performance of the brush can be guaranteed and an increased negative pressure in the suction chamber 6 arises. The brush roller 10 can therefore with the help of the adjustment 16 , as in 2 B shown pivoted upwards about a pivot axis, so that the penetration depth of the filaments 14 the brush roller 10 in the fibers 11 of the carpet is reduced. By this change in the ground clearance of the brush roll 10 The suction nozzle can be adapted to the different soil conditions, such as hard floors or carpets with different pile lengths. This is preferably done automatically via the measuring device 18 In the suction chamber measured negative pressure, which to the control means 20 is forwarded, whereupon an adjustment of the height of the brush roller 10 via the adjustment means 16 is made.

In 3 is a perspective view of a second embodiment of a suction nozzle according to the invention 1 shown. In contrast to the first embodiment, the height of the housing 2 changeable to a floor to be cleaned and not the position of the brush roller 10 in the case 2 , These are at the bottom of the case 2 Support wheels on both sides 16 arranged in the housing 2 are movable. It would also be possible the change in position of the housing 2 provided by elongated runners.

4a shows the second embodiment of the suction nozzle according to the invention with retracted support wheels 16 , Also in this case fibers penetrate 11 in the suction mouth 4 and get tangled up with the filaments 14 the brush roller 10 , As a result, as already described above, the negative pressure in the suction chamber increases 6 and the cleaning performance of the suction nozzle 1 decreases.

In 4b This problem is solved by the support wheels 16 are extended and thereby sufficient vertical distance between the suction mouth 4 or the brush roller 10 and the fibers 11 consists.

In 5 is a perspective view of a third embodiment of a suction nozzle according to the invention shown. In this case, the housing has 2 In addition, in a direction of travel of the suction nozzle further behind section a second suction mouth 22 and a secondary suction channel 21 on. The second suction mouth 22 connects the secondary suction channel 21 with the environment of the suction nozzle 1 , The secondary suction channel 21 is also with the suction channel 8th fluidically connected. At the secondary suction channel 21 is an adjusting means 24 formed, whereby the suction air supply to the second suction mouth 22 can be interrupted. The adjusting means 24 is with the control means 20 connected.

Furthermore, on the electric motor 26 a measuring device 28 arranged, which also with the control means 20 connected is. The brush roller 10 is in the housing as in the first embodiment 2 via adjustment means 16 stored.

In 6 is a schematic sectional view of the third embodiment shown. Again, there are too many fibers 11 in the suction mouth 6 the suction nozzle 1 , The increased negative pressure can in this embodiment additionally via an opening of the adjusting means 24 be compensated, since then a part of the suction air flow through the second suction mouth 22 can be sucked in. This also fines, which is not already through the brush roll 10 was removed from the floor to be cleaned.

By continuing a meter 28 on the electric motor 26 arranged and with the control means 20 connected, both the adjustment means 16 as well as the adjustment means 24 in a more reliable way by the control means 20 to be controlled. For example, if both the absorbed current of the electric motor 26 and that of the measuring means 16 measured negative pressure increases, so can on the one hand, the brush roller 10 continue to be moved into the housing, which reduces the penetration and increases the suction gap and / or the adjustment 24 be opened, causing a reduction of the negative pressure in the suction chamber 6 is ensured.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102015105173 A1 [0006]
• DE 102008010334 A1 [0007]

Claims (15)

Suction nozzle for a vacuum cleaner (3) for cleaning a floor, - with a housing (2), - with a in the housing (2) formed first suction mouth (4), - with a housing (2) formed in the suction chamber (6), - with a suction channel (8) formed in the housing (2) and - with a rotatable brush roller (10), - the brush roller (10) having a roller body (12) and filaments (14), - wherein the suction space (6) over the first suction port (4) fluidly connected to the environment of the suction nozzle (1) and - wherein the suction channel (8) in the suction chamber (6) opens, characterized in that - the penetration depth of the brush roller (10) in a floor to be cleaned by at least a setting means (16) is variable, - that at least one measuring means (18) for measuring the pressure in the suction chamber (6) is arranged and - that a control means (20) the adjusting means (16) of the brush roller (10) in dependence of the Measuring means (18) measured pressure changed. Suction nozzle after Claim 1 , characterized in that the adjusting means (16) changes the position of the brush roller (10) relative to the housing (2). Suction nozzle after Claim 1 , characterized in that the adjusting means (16) changes the position of the housing (2) to a floor to be cleaned. Suction nozzle for a vacuum cleaner (3) for cleaning a floor, - with a housing (2), - with a in the housing (2) formed first suction mouth (4), - with a housing (2) formed in the suction chamber (6), - with a suction channel (8) formed in the housing (2) and - with a rotatable brush roller (10), - the brush roller (10) having a roller body (12) and filaments (14), - wherein the suction space (6) over the the suction port (8) in the suction chamber (6) opens, characterized in that - at least one measuring means (18) for measuring the pressure in the suction chamber (6 ) is arranged, that in the housing (2) at least one secondary air opening (22) is formed and - that a control means (20) the size of the secondary air opening (22) by at least one adjusting means (24) in dependence of the measuring means (18) measured pressure in the suction chamber (6) changed. Suction nozzle after Claim 4 , characterized in that the secondary air opening is formed as a second suction mouth (22). Suction nozzle after one of Claims 1 to 3 and one of the Claims 4 or 5 , characterized in that the control means (20) changes both the adjusting means (16) and the adjusting means (24) in dependence on the pressure measured by the measuring means (18). Suction nozzle after one of Claims 1 to 3 or Claim 6 , characterized in that - an electric motor (26) drives the brush roller (10) and - that the control means (20) changes the penetration depth of the brush roller (10) in addition to the power consumption of the electric motor (26) measured by a measuring device (28) , Suction nozzle after one of Claims 4 to 7 Characterized in that - an electric motor (26) driving the brush roller (10) and that the control means (20) further changes the size of the secondary air opening (22) in dependence of a measurement device measured (28) current consumption of the electric motor (26). Suction nozzle after Claim 7 or 8th , characterized in that the housing (2) comprises an optical display (30) indicating optical signals based on the pressure in the suction space (6) and / or the current consumption of the electric motor (26). Suction nozzle after one of Claims 6 to 9 Characterized in that the control means (20) actuates the adjustment means (16) and / or the adjusting means (24) automatically in dependence on the measured data. Suction nozzle after Claim 9 , characterized in that a user manually activates the control means (20) in response to the data displayed by the visual display (30). Method for operating a suction nozzle, in particular according to one of Claims 1 to 3 and 6 to 10 in which the pressure in the suction space (6) is measured by a measuring means (18) and - in which the penetration depth of the brush roller (10) is adjusted by adjusting means (16) as a function of the pressure in the suction space measured by the measuring means (18) ( 6) via a control means (20) is changed. Method for operating a suction nozzle, in particular according to one of Claims 4 to 10 , - in which the pressure in the suction chamber (6) by a measuring means (18) is measured and - in which the size of the secondary air opening (22) by at least one adjusting means (24) as a function of the measuring means (18) measured pressure in the suction chamber (6) via a control means (20) is changed. Method according to claims 12 and 13, in which the penetration depth of the brush roller (10) is adjusted by an adjustment means (16) and / or the size of the secondary air openings (22) by an adjustment means (24) in dependence on the pressure measured by a measuring means (18) in the suction chamber (6) and / or depending on the measured current consumption of the electric motor (26) via a control means (20) to be changed. Method according to Claim 14 in which the adjusting means (16) and / or the adjusting means (24) are automatically actuated by a control means (20) in dependence on the measured data.

Images