CN106906609B - Household appliance for treating items of clothing and method for operating a household appliance - Google Patents
Household appliance for treating items of clothing and method for operating a household appliance Download PDFInfo
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- CN106906609B CN106906609B CN201611001720.5A CN201611001720A CN106906609B CN 106906609 B CN106906609 B CN 106906609B CN 201611001720 A CN201611001720 A CN 201611001720A CN 106906609 B CN106906609 B CN 106906609B
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- magnetic field
- laundry drum
- laundry
- rotational speed
- household appliance
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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
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/16—Imbalance
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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
- D06F23/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry
- D06F23/02—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry and rotating or oscillating about a horizontal axis
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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
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
- D06F37/225—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
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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
- D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
- D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
- D06F37/24—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a vertical axis
- D06F37/245—Damping vibrations by displacing, supplying or ejecting a material, e.g. liquid, into or from counterbalancing pockets
Abstract
The invention relates to a household appliance for caring for items of laundry, having a laundry drum for receiving items of laundry, and having at least one unbalance compensation device having a housing in which a plurality of compensation elements are movably contained, wherein the unbalance compensation device has a magnetic field generating device, viewed in the direction of rotation about the axis of rotation of the laundry drum, the magnetic field acting on the compensation element can be generated dynamically variably in a specific azimuthal position by the magnetic field generating device, wherein, when the rotation speed of the laundry drum is less than or equal to the reference rotation speed of the laundry drum, a magnetic field acting on the compensation element is generated by a magnetic field generating device in an azimuthal section about the axis of rotation, wherein the azimuthal position variation of the segments is coupled with the rotational speed of the laundry drum. The invention also relates to a method for operating a household appliance for care of items of clothing.
Description
Technical Field
The invention relates to a household appliance for caring for items of laundry, having at least one laundry drum for receiving items of laundry, and having at least one unbalance compensation device having a housing in which a plurality of compensation elements are movably contained. The invention further relates to a method for operating a household appliance.
Background
During the washing process of a washing machine, it is known that a random and uneven distribution of laundry items occurs in the laundry drum. This results in an imbalance which causes large mechanical vibrations of the laundry drum and thus also large mechanical loads of the entire household appliance. On the one hand, the resulting vibrations produce noise which is unpleasant for the user; on the other hand, this also causes a mechanical load on the floor layer on which the household appliance is placed.
In order to prevent or at least greatly reduce vibrations of the laundry drum during operation of the washing machine, it has been proposed in the prior art to fasten an annular unbalance compensation device, also known under the name "Ball Balancer", to the laundry drum. Such an imbalance compensation device has an annular hollow housing in which there is a compensation mass, which is provided, for example, in the form of a plurality of spherical compensation elements. The compensating mass is mounted so as to be movable within the housing and, when the washing machine is operating in the supercritical state (the rotational speed of the laundry drum is higher than the "resonant rotational speed"), tends to move to the side opposite the unbalanced mass with respect to the diameter of the laundry drum, in order to thereby establish a corresponding weight for the unbalanced mass and thus to establish a balance as a whole. The movement of the compensating mass takes place automatically and is caused by forces acting on the balancing mass, which forces are formed during operation of the washing machine due to unbalance-induced vibrations, rotation of the laundry drum and gravity. A disadvantage of such unbalance compensation devices is that, in particular when the washing machine is operating subcritical (the rotational speed of the laundry drum is below the "resonant rotational speed"), the compensation mass moves in the direction of the unbalance mass, as a result of which the vibrations are more intensified.
This configuration is illustrated, for example, by publication US 2011/0203325a 1.
From EP 2441872 a1, a washing machine is known in which the balls can be influenced by the magnetic field generated by two electromagnets, which are arranged outside the laundry drum and in a stationary manner in the washing machine housing. Both electromagnets are arranged in an upper region. The magnetic field generated by the electromagnet is constant with respect to its spatial position.
Disclosure of Invention
The object of the present invention is to provide an improved unbalance compensation of a laundry drum compared to the prior art.
According to the invention, this object is achieved by a household appliance and a method for caring for items of clothing according to the respective independent claims.
The household appliance according to the invention for treating items of laundry comprises a laundry drum rotatable about a rotation axis for receiving items of laundry. Furthermore, the household appliance comprises at least one imbalance compensation device having a housing in which a plurality of separate compensation elements are movably contained or arranged. The unbalance compensation device comprises a magnetic field generating device by means of which a magnetic field is generated which can act on the compensation element. Viewed in the azimuth direction (atzmutaler), the magnetic field can be generated in a dynamically variable or rotating manner. In particular, the magnetic field acting on the compensation element is generated in a revolving manner and thus in an incompletely closed revolving manner at specific azimuthal positions, as viewed in the revolving direction about the axis of rotation of the laundry drum.
The basic idea of the invention is that a magnetic field acting on the compensation element is generated by the magnetic field generating device in an azimuthal section as viewed around the axis of rotation of the laundry drum when the rotational speed of the laundry drum is less than a reference rotational speed of the laundry drum. Such a magnetic field is thus only formed in a section with respect to the axis of rotation of the laundry drum, i.e. at a specific azimuthal position, and is therefore referred to simply as a section magnetic field. The magnetic field is generated in such a way that it acts on at least individual ones of the compensation elements with respect to the rotational speed of these compensation elements about the rotational axis of the laundry drum. The azimuthal position variation of the segments as viewed about the axis of rotation is coupled to the rotational speed of the laundry drum. The magnetic field generating device is thus designed to generate a magnetic field locally at a specific azimuth angle section, which acts on the compensation element for position maintenance of the compensation element, wherein the dynamic magnetic field generation is linked to the rotational speed of the laundry drum. This segmented "further excursion" of the magnetic field in the azimuthal direction is thus to some extent dependent on the rotational speed of the laundry drum. This also means that, in the case of an increase or decrease in the rotational speed, the sectional "further travel" of the magnetic field accelerates or decelerates.
By means of this configuration of the household appliance, the compensating element can be positioned in a desired manner in a very simple manner in a low and subcritical rotational speed range. In particular, it is then also possible to prevent the compensating elements from moving in an undesired manner such that they even more, if possible, exacerbate the imbalance in the laundry drum caused by the laundry items, as is known without the present configuration, in particular when operating in the subcritical rotational speed range. It is in the rotational speed range which is lower than or equal to the reference rotational speed, which causes greater wear of the bearing of the laundry drum and, in particular, undesirably loud noises.
Preferably, the reference rotational speed is a predetermined rotational speed of the laundry drum and can be found by experiment. Preferably, the reference rotational speed is the rotational speed of the laundry drum from which the compensation mass of the unbalance compensation device for establishing a balance is reliably and automatically moved to the side opposite the unbalance mass with respect to the diameter of the laundry drum. The rotational speed is dependent in particular on the structural design of the imbalance compensation device and its compensation mass, on the frictional effect and on the forces acting on the compensation mass caused by the vibrations caused by the imbalance, the gravitational forces and the rotation of the laundry drum. A particular advantage of the proposed configuration of the household appliance is that even at low rotational speeds of the laundry drum, i.e. equal to or less than the reference rotational speed, at which the compensating mass would not have caused a reliable automatic displacement, an imbalance compensation or unbalance reduction can be caused, since the proposed dynamic magnetic field generation provides an additional magnetic force acting on the compensating mass, which magnetic force can cause the required displacement of the compensating mass for the imbalance compensation.
Here, the azimuth angle is also understood to be the polar angle of a point of a plane (xy-plane) formed by the unbalance compensation device, which plane is perpendicular to the rotation axis of the laundry drum, when said point is given in the polar angle coordinate system. Furthermore, the azimuth direction describes the direction of the polar angle, which is oriented along a circular curve path around the origin of the polar coordinate system, or in the direction of rotation around the axis of rotation of the laundry drum. Furthermore, an azimuth angle section, in which a variable magnetic field is generated, is also understood to mean a sector having a predetermined center point angle of less than 360 °, in particular a radially outer region of a sector, wherein the sector lies in a plane formed by the unbalance and the center of the sector is the intersection of the rotational axis of the laundry drum and the plane formed by the unbalance.
It is advantageously provided that, by means of the dynamically variable magnetic field, the compensation element is held in a rotational speed range which is less than or equal to the reference rotational speed without an azimuthal relative movement with respect to the laundry drum. The compensating element is thereby held in a fixed position relative to the laundry drum in the direction of the azimuth angle. Since the magnetic field generating device therefore does not have a local, continuous magnetic field in regions to some extent, but rather a dynamic change in position occurs in connection therewith, the regional position and the azimuthal and radial extent of the magnetic field can be generated very precisely. The magnetic field can also vary very precisely in view of its duration during which it is generated at an azimuthal location and thus varies incoherently or time-discretely and thus exists incoherently or does not exist. This has a very positive effect on the movement behavior of the compensation element in such subcritical and critical rotational speed ranges at rotational speeds less than or equal to the reference rotational speed.
In particular, at least the housing of the imbalance compensation device and the compensation element located in the housing are arranged on the laundry drum and connected to the latter in a stationary manner.
In an advantageous embodiment of the invention, it is provided that the magnetic field generating device can also dynamically change the extension of the magnetic field in the azimuth direction. In this way, compensation elements which may be detached from one another in the azimuth direction and thus do not abut against one another or are at an undesired distance from one another can be brought together again or held in position in connection therewith, so that an azimuthal drift of the compensation elements can be suppressed.
In an advantageous embodiment, it is provided that the speed of the azimuthal position change of the sectionally generated magnetic field is equal to the rotational speed of the laundry drum. This is particularly advantageous in that the compensating element is thereby rotated about the axis of rotation in a position fixed relative to the laundry drum in this particular rotational speed range which is less than or equal to the reference rotational speed. It is therefore particularly advantageous to compensate for the imbalance caused by the items of clothing by such a carry-over of the compensation element.
Preferably, the reference speed is less than or equal to a rotational speed corresponding to a resonance range of the laundry drum. Here, the resonance range of the laundry drum is understood to be a rotational speed range whose rotational frequency corresponds to the resonance frequency of the vibrationally supported system in which the laundry drum is rotatably arranged.
In particular, it is provided that the household appliance has an imbalance determination device for determining an imbalance caused by the laundry items, in particular with respect to the position and/or size of the interior of the laundry drum. As a result, the compensation for the imbalance caused can be carried out particularly accurately in the lower rotational speed range. Since, by means of this precise knowledge of the imbalance caused by the items of clothing, the relative position of the compensating element can also be set very precisely, and the magnetic field generated dynamically in the azimuth angle section is set very precisely both in azimuth and in radial direction and also in view of the dynamic speed of rotation of the magnetic field or of the magnetic field region about the axis of rotation.
Preferably, it is provided that, when the rotational speed of the laundry drum is less than or equal to a reference rotational speed of the laundry drum, a magnetic field for acting on a compensation element is generated in an azimuth angle section through which a compensation element for compensating an imbalance caused by the laundry items is arranged. In particular, it is provided that, depending on the rotational speed of the laundry drum, a magnetic field is generated in each case in an azimuth section which is arranged 180 ° in the direction of rotation about the rotational axis from the position of the laundry item in which an imbalance occurs. It is thereby very preferably obtained to compensate for imbalances caused by the laundry items in said rotational speed range being less than or equal to the reference rotational speed.
In particular, it is provided that the magnetic field generating device for generating a dynamically variable magnetic field, which is segmented in azimuth, has at least three, in particular at least six, in particular between seven and nine, separate electromagnets. The individual electromagnets can thus be individually controlled in order to generate individual magnetic fields in a very discrete time sequence and with regard to the magnetic field strength. The electromagnets are preferably arranged equidistant from each other in the direction of revolution about the axis of rotation. This makes it possible to produce a very homogeneous magnetic field in sections. In this way, a dynamically azimuthally rotating magnetic field with a very precise rotation speed is then generated by the electromagnets each acting at least once, which magnetic field can then also be individually and precisely frequency-matched to the rotational speed of the laundry drum.
It may be provided that the azimuth section associated therewith extends in the azimuth direction to such an extent that the magnets generate their respective generated magnetic fields. However, depending on the number of the compensating elements and/or depending on the rotational speed of the laundry drum and/or depending on the size of the imbalance, as it is produced by the laundry items, and/or depending on the size of the electromagnets, it is also possible to construct a segment from at least two adjacent electromagnets, which are then operated at least temporarily in the active operation for generating the magnetic field in view of the magnetic field generation thereof.
The azimuth angle of such a section can therefore also be adjusted individually, depending on the case, preferably to less than 180 °, in particular to less than 90 °.
Advantageously, the electromagnet is arranged to rotate at the rotational speed of the laundry drum. This configuration can also be achieved in that the plurality of electromagnets or at least one of the electromagnets generates a magnetic field at least temporarily over a longer time, by which magnetic field the compensating element is then held. By means of this entrainment rotation, a dynamic change of the magnetic field is carried out until the compensating element is arranged in a position by means of which an imbalance caused by the items of clothing in this rotational speed range which is less than or equal to the reference rotational speed is at least significantly reduced, in particular compensated. If the compensating element is then held in a fixed position relative to the laundry drum by an electromagnet operated specifically for this purpose, the entire assembly rotates about the axis of rotation at the same frequency as the laundry drum. The magnetic field that is displaced azimuthally by the alternating switching on and off of the azimuthally adjacent electromagnets is no longer present here from the point of view where the desired position of the compensating element for the unbalance compensation caused by the laundry items is reached, wherein this is not done at least until the reference rotational speed is reached.
However, here too the magnetic field continues to move azimuthally. Temporarily at least by individual switching on and off of the electromagnets that follow one another in azimuth (which electromagnets also rotate), temporarily only by rotation of the electromagnets that then continue to function.
Preferably, in one such configuration, the electromagnet is arranged stationary on the laundry drum itself. In particular, it is provided that the electromagnets are arranged on a housing in which the compensation element is arranged. This is particularly advantageous for mechanically stable fastening, the rotational behavior and the effect of the generated magnetic field on the compensation element.
In particular, provision is made for the electromagnet to rotate together with the laundry drum, to be controlled inductively or by a radio signal. By such a wireless connection, the signal can be transmitted without problems and the degree of freedom of movement of the electromagnet is not limited. Slip rings are also conceivable for powering the rotating electromagnets.
In particular, it is provided that at least the individual compensation elements are at least partially ferromagnetic.
With the household appliance according to the invention, the oscillation stroke of the vibrationally supported system, which at least comprises the laundry drum and usually also the immersion liquid container, which is at a maximum in the vicinity of the critical rotational speed range of the laundry drum or in the case of a reference rotational speed, in particular in or near the resonance range, is no longer additionally undesirably increased by imbalances as are produced by the laundry items. Since it is in this subcritical and critical speed range that very accurate compensation or at least reduction of this possible imbalance is brought about by the invention. It is particularly advantageous to avoid the known development of vibrations in the subcritical rotational speed range in such a compensating device.
Furthermore, it is provided that the imbalance compensation device and in particular the magnetic field generating device can be configured individually for the disengagement of a plurality of compensation elements even when the rotational speed is higher than the reference rotational speed, by switching off the magnetic field. In this way, the state or situation in which the compensating element can again move relative to the laundry drum can also be set individually in this high rotational speed range and is no longer dependent on centrifugal forces, which may cause an undesired detachment of the compensating element from the magnet.
In an alternative configuration, the magnetic field generating device can also be configured outside the laundry drum, wherein in this configuration the azimuthally wandering, sectionally configured magnetic field is generated by the magnetic field generating device synchronously with the rotation of the laundry drum. For example, the magnetic field generating device can be arranged on an immersion liquid container in which the laundry drum is rotatably mounted.
For example, in a configuration in which a magnetic field that is influenced from the outside is designed in a rotationally conjoint manner, a configuration of the magnetic field generating device can also be provided, which is similar to the stator ring in an electric motor. In this configuration, no components which rotate with them are attached to the laundry drum which acts on the compensation element or to the housing of the imbalance compensation device which generates the magnetic field. Furthermore, a wired power supply connection or a communication connection of these components to a control device can also be provided here, and inductive control or control via radio signals is not necessary but possible.
In all the illustrated embodiments, it is not necessary for the compensation element to be designed as a permanent magnet (Dauermagnet) or as a permanent magnet. However, corresponding materials can be provided in this connection.
It is preferably merely required that at least the individual compensation elements are at least partially formed from ferromagnetic material. This also avoids the advantages in view of the undesirably constant magnetic field generated by the compensation element.
The ferromagnetic material is magnetized in an external magnetic field in such a way that the magnetic flux density in the interior of the ferromagnetic material is increased drastically compared to the external space. Such a body is therefore attracted by one pole of the external magnetic field.
In a method according to the invention for operating a household appliance for caring for items of laundry, the household appliance is provided with a laundry drum which is rotatable about an axis of rotation for receiving the items of laundry, and with at least one unbalance compensation device having a housing in which a plurality of compensation elements are movably contained. The magnetic field generating device of the unbalance compensation device dynamically and variably generates a magnetic field acting on the compensation element, viewed in the direction of rotation about the axis of rotation of the laundry drum. The basic idea of the invention is that a magnetic field which acts on the compensation element, in particular with regard to the rotational speed of the compensation element about the rotational axis of the laundry drum, is generated by the magnetic field generating device in sections with respect to the rotational axis when the rotational speed of the laundry drum is less than or equal to a reference rotational speed of the laundry drum. The azimuthal position variation of the magnetic field generated in sections is coupled with the rotational speed of the laundry drum. The advantages that can be achieved thereby have already been explained above for the household appliance.
Preferably, the azimuthal position variation of the field generated in sections is implemented at a speed equal to the rotation speed of the laundry drum.
Preferably, when the rotational speed of the laundry drum is less than or equal to a reference rotational speed of the laundry drum, a magnetic field for acting on the compensation element is generated in such an azimuth angle section, by means of which the compensation element for compensating the unbalance generated by the laundry items is arranged.
Preferably, the magnetic field generating device for generating the dynamically variable magnetic field, which is segmented in azimuth, has at least three, in particular at least six, in particular between seven and nine, separate electromagnets, wherein the electromagnets are preferably arranged at equal distances from one another in the direction of rotation relative to the axis of rotation and the electromagnets rotate together at the rotational speed of the laundry drum.
In an advantageous manner, it is thereby provided that the reference rotational speed is less than or equal to a rotational speed of the laundry drum which corresponds to a resonance range of the laundry drum. The reference rotational speed is also in particular smaller than the maximum rotational speed of the laundry drum.
Since the compensation elements then remain fixed in a self-balancing manner during the reaching of the resonance range and thus also when the frequency of the resonance range is experienced to some extent — in relation to the laundry items in the laundry drum-and do not move with the same movement relative to the housing of the unbalance compensation device and thus have to some extent the same rotational speed as the laundry drum and the unbalance compensation device itself, the unbalance generated by the laundry items is not even increased by the unbalance generated by these compensation elements.
The compensating element is in particular a ball. The ball can move correspondingly in the hollow chamber of the housing. It can be provided that in addition, oil or water is also contained in this hollow space of the housing, by means of which the noise development of the compensating element, in particular of the ball, which moves relative to the housing is reduced again.
Preferably, the compensation element, which interacts only magnetically, may be made of steel, for example, and is not designed as a magnet (permanent magnet ).
It is precisely when the compensating element is constructed from a synthetic material on the outside that a noise reduction can advantageously be achieved even in the case of a rotational speed of the laundry drum which is greater than a reference rotational speed.
The individual compensation elements can also be designed as permanent magnets or as permanent magnets.
An unbalance compensation device is understood here to be a device which is designed to compensate for and thus prevent an unbalance of the laundry drum. The imbalance compensation device may have a balancing mass, for example in the form of a plurality of spherical elements, which is movably arranged in the housing. Such an unbalance compensation device may also be referred to as a "ball balancer". The at least one imbalance compensation device is in particular designed as a ring and has a housing which is in particular designed as a ring.
The terms "front", "rear", "vertical" and the like are used and are to be understood in the context of the intended use and the intended arrangement of the appliance, as well as in the context of an observer who then stands in front of the appliance and looks in the direction of the appliance.
Further features of the invention emerge from the claims, the figures and the description of the figures. The features and feature combinations previously listed in the description and the features and feature combinations subsequently listed in the description of the figures and/or shown in the figures individually can be used not only in the respective described combinations but also in other combinations without leaving the scope of the invention. Thus, the following embodiments of the invention should also be considered to include or disclose: the embodiments are not explicitly shown and explained in the figures, but are known from and can be produced by separate combinations of features from the illustrated embodiments. Embodiments and combinations of features which do not have all the features of the independent claims written as an original should therefore also be regarded as disclosed. Furthermore, embodiments and combinations of features which are beyond or deviate from the combinations of features set forth in the claims, in particular in the light of the above-described embodiments, are to be regarded as disclosed.
Drawings
Embodiments of the invention are explained in more detail below on the basis of schematic drawings. Showing:
fig. 1 shows a schematic front view of an embodiment of a household appliance for care of items of clothing according to the present invention;
fig. 2 shows a sectional view of a region of an assembly with an unbalance compensation device and a laundry drum according to an embodiment of the invention in a schematic illustration;
fig. 3 shows a simplified illustration of the components of an embodiment of an unbalance compensation device of a household appliance according to fig. 1 and 2.
In the drawings, elements that are the same or functionally the same are provided with the same reference numerals.
Detailed Description
In fig. 1, a household appliance 1 for caring for items of laundry, which may be, for example, a washing machine or a washer-dryer, is shown in a simplified front view. The household appliance 1 comprises a housing 2 in which a laundry drum 3 is rotatably supported. In the present exemplary embodiment, the longitudinal or rotational axis a (fig. 2) of the laundry drum 3 is oriented perpendicular to the drawing plane in the illustration of fig. 1. Furthermore, the household appliance 1 comprises an immersion liquid container 4 which is also arranged in the housing 2 and surrounds the laundry drum 3. The laundry drum 3 comprises a hollow cylindrical shell and a rear end wall and is furthermore constructed open on the front side, so that a loading opening is provided here, through which laundry items can be inserted into the interior 5 of the laundry drum 3. The filling opening can be closed by a door 6, which is movably arranged on the housing 2.
In fig. 2a vertical cross-section and thus a view about a y-z plane cross-section is shown. The laundry drum 3 is shown with a hollow cylindrical shell 7. The charging opening 8 is also shown. The laundry drum 3 has a carrier star 10, which is fixedly connected to the laundry drum 3, adjacent to the rear wall or rear end wall 9. The carrier star 10 is connected to the shaft 11 in a rotationally fixed manner, wherein the shaft 11 is driven by a drive motor, not shown, in order to rotate the laundry drum 3 about the axis of rotation a.
During operation of the household appliance 1 and thus with a rotation of the laundry drum 3, the already inserted laundry items may rest on the inner side 12 of the housing 7 in an asymmetrically distributed manner about the axis a, so that an imbalance may occur when the laundry drum 3 rotates. In order to counteract this imbalance or to compensate for it, in the embodiment shown the household appliance 1 comprises two imbalance compensation means 13 and 14. As can also be seen, a plurality of drivers is arranged on the inner side 12, of which only one driver 15 is visible in fig. 2.
Viewed in the direction of the axis a, the front unbalance compensation device 13 is arranged in a front region 16 of the laundry drum 3 and in particular the housing 7, while the second unbalance compensation device 14 is arranged in a rear region 17.
The first unbalance compensation device 13 is designed as a revolving closed ring, which is oriented rotationally symmetrically about the axis a. The first unbalance compensation means 13 comprise an annular housing 18 associated therewith, which, as can be seen in the sectional view in fig. 2, has, for example, a quadrangular cross section, but which may also have another shape, for example a D-shape. The housing 18 has a hollow space 19 in which one or more compensating elements 20 are movably arranged relative to the housing 18. In this embodiment, the compensating element 20 may be a ball. In addition or alternatively, a liquid medium, such as oil or water, can also be arranged in the hollow space 19.
The second unbalance compensation device 14 is also designed accordingly, which also has a correspondingly designed housing 21, a hollow space 22 located inside with respect to the housing, and one, particularly preferably a plurality of separate compensation elements 23, which are balls, which are movable in the hollow space 22 relative to the housing 21.
The imbalance compensation devices 13 and 14 are each inserted into a revolving receptacle 24.
Fig. 3 shows a simplified front view of the components of the imbalance compensation device 13. The imbalance compensation device 14 is preferably identically constructed. Here, a housing 18 can be seen, in the hollow space 19 of which a plurality of compensating elements 20 are arranged. The compensating elements 20 are in particular all designed to interact at least magnetically, of which only individual compensating elements are provided with reference symbols for the sake of clarity. These compensation elements may be at least partially ferromagnetic. It can be provided that the compensating element 20 has a core made of ferromagnetic material, in particular a jacket made of synthetic material, which surrounds the core.
As can be seen in fig. 3, the imbalance compensation device 13 has a magnetic field generating device 34. In the embodiment shown, the magnetic field generating means comprise a plurality of separate electromagnets, in particular at least six electromagnets, preferably eight electromagnets 25, 26, 27, 28, 29, 30, 31 and 32. The electromagnets 25 to 32 are arranged equidistant from each other as seen in the direction of revolution about the axis of rotation a of the laundry drum 3. The electromagnets 25 to 32 are controlled by a control unit 33.
In the exemplary embodiment shown, electromagnets 25 to 32 are arranged stationary on laundry drum 3, in particular on housing 18, so that they are arranged in a rotating manner with laundry drum 3. In the case of a configuration associated therewith, the control signals are transmitted as radio signals of the control unit 33 to the respective electromagnets 25 to 32. The supply of current to the electromagnets 25 to 32 can be provided by means of a not shown energy accumulator which is also arranged on the laundry drum 3 in a co-rotating manner. Furthermore, in alternative embodiments, the supply of power and/or the transmission of control signals to the electromagnets 25 to 32 can also be provided inductively or via a slip ring transmitter (schleifriguebert rack).
When the rotational speed of the laundry drum 3 is less than or equal to a reference rotational speed, which is less than or equal to a rotational speed corresponding to the resonance range of the laundry drum 3, a magnetic field is generated by the magnetic field generating device 34 in the azimuth angle section 37 about the rotational axis a, which magnetic field has an effect on the parameters of the rotational speed of the compensation element 20 about the rotational axis a. The azimuthal position variation of the section 37 and thus the position variation about the axis of rotation a is coupled to the rotational speed of the laundry drum 3.
In the illustrated embodiment, in which the electromagnets 25 to 32, which rotate with them, are in the speed range which is less than or equal to the reference speed of the laundry drum 3, this is achieved in that: depending on the imbalance of the laundry items 35, in particular determined by the imbalance determination device 36, in particular with respect to the azimuth position and the radial azimuth size, the compensation element 20 is brought into a position in which the imbalance is at least reduced. For this purpose, the electromagnets 25 to 32 are activated and deactivated with respect to their magnetic field generation, in particular as a function of the instantaneous position of the compensation element 20. Thereby, a change in the azimuthal position of the magnetic field is produced by individually switching on or off the rotating electromagnets 25 to 32. If the compensating element 20 is then brought into the desired azimuthal position relative to the items of clothing 35, it is held in this position in that the electromagnet or adjacent electromagnets 25 to 32, in particular those which lie opposite the items of clothing, are continuously held in an active and thus magnetic field-generating state, so that this position can be maintained. The other electromagnets 25 to 32 remain inactive during further rotation and thus do not generate a magnetic field. However, the magnetic field then also migrates in the sector azimuth angle, since the active electromagnets 25 to 32 continue to rotate, to be precise at the rotational speed of the laundry drum 3. The dynamic, azimuthal magnetic field change thus occurs in different ways depending on the position of the compensation element 20.
Until the particular position of the compensating element 20 for compensating the imbalance caused by the laundry items 35 in the azimuthal direction about the axis of rotation a, in particular offset by 180 ° relative to the laundry items 35, is reached, the electromagnets 25 to 32 are not individually controlled as described above, so that the compensating element 20 in principle reaches this desired, oppositely offset position and then continues to remain in this position. In this first phase, a targeted relative movement of the compensation element 20 relative to the laundry drum 3 is thus caused by the azimuthal magnetic field change, which is not the case in the second phase, but rather the compensation element 20 is held in a positionally fixed position relative to the rotating laundry drum 3 by rotation in the second phase.
In this embodiment, the segment excursion of this magnetic field is then also preceded, on the one hand, by a state in which the compensating element 20 is opposite the laundry item 35, since the individual electromagnets 25 to 32 are then each controlled one after the other in the direction of rotation in order to be switched on or off and thus to generate or not generate a corresponding magnetic field. On the other hand, the excursion of the magnetic field is performed by its own rotation after reaching said position of the compensation element 20.
If, on the other hand, an embodiment is formed in which the electromagnets 25 to 32 do not rotate together with the laundry drum 3 and are therefore arranged in a stationary manner in the housing 2, it is also possible here to generate a segmented excursion of the magnetic field by switching the electromagnets 25 to 32 following one another on and off in the direction of rotation about the axis of rotation a.
It is also to be noted that in the illustration in fig. 3, the compensating elements 20 are still arranged at a distance from one another, so that in such a position or position, the imbalance caused by the laundry items 35 cannot be adequately compensated. It is therefore preferred that the compensating elements 20 are brought into a position closer to one another, which is achieved by targeted control of the electromagnets, in particular of the electromagnets 25, 26 and 31 and 32. In the preferred position for maximum compensation of the imbalance caused by the laundry items 35, the compensation elements 20 then bear against one another and are then held in a fixed position relative to the laundry drum 3 by the magnetic fields of the electromagnets 25 and 32.
List of reference numerals
1 household appliance
2 casing
3 clothes drum
4 immersion liquid container
5 inside
6 door
7 hollow cylindrical shell
8 charging opening
9 rear wall
10 bearing star
11 axle
12 inside
13. 14 unbalance compensation device
15 driving part
16 front area
17 rear region
18 casing
19 hollow chamber
20 compensating element
21 casing
22 hollow chamber
23 compensating element
24 receiving part
25 electromagnet
26 electromagnet
27 electromagnet
28 electromagnet
29 electromagnet
30 electromagnet
31 electromagnet
32 electromagnet
33 control unit
34 magnetic field generating device
35 article of clothing
36 unbalance determining device
37 azimuthal section
Claims (17)
1. Household appliance (1) for caring for laundry items (35) having a laundry drum (3) rotatable about a rotation axis (A) for receiving laundry items, having at least one imbalance compensation device (13, 14) having a housing (18, 21) in which a plurality of compensation elements (20, 23) are movably contained, wherein the imbalance compensation device (13, 14) has a magnetic field generating device (34), the magnetic field generating device (34) being provided for dynamically variably generating a magnetic field acting on the compensation elements (20, 23), characterized in that the magnetic field generating device (34) is further provided for dynamically generating a magnetic field acting on the compensation elements (20, 23) when a rotational speed of the laundry drum (3) is less than or equal to a reference rotational speed of the laundry drum (3), generating a magnetic field acting on a compensating element (20, 23) in sections about the axis of rotation (A), wherein the azimuthal position variation of the magnetic field generated in sections is coupled to the rotational speed of the laundry drum (3), wherein the azimuthal position of the magnetic field relative to a magnetic field generating device (34) is dynamically variable, wherein the household appliance has an imbalance determining device (36) for determining an imbalance caused by the laundry item (35) in terms of position inside the laundry drum, wherein a magnetic field acting on a compensating element (20, 23) is generated in such an azimuthal section (37) when the rotational speed of the laundry drum (3) is less than or equal to a reference rotational speed of the laundry drum (3), by means of which magnetic field the compensating element (20, 23) is arranged for compensating the imbalance caused by the laundry item, 23).
2. Household appliance (1) according to claim 1, characterized in that the speed of azimuthal position variation of the sectionally generated magnetic field is equal to the rotation speed of the laundry drum (3).
3. Household appliance (1) according to claim 1 or 2, characterized in that said reference rotation speed is less than or equal to a rotation speed corresponding to a resonance range of said laundry drum (3).
4. Household appliance (1) according to claim 1 or 2, characterized in that it has unbalance determination means (36) for determining an unbalance in size caused by the laundry item (35).
5. Household appliance (1) according to claim 3, characterized in that a magnetic field is generated in such azimuthal sectors (37) respectively, according to the rotation speed of the laundry drum (3), which are arranged at 180 ° in the direction of revolution around the rotation axis (A) with respect to the position of the laundry item (35) that generates the unbalance.
6. Household appliance (1) according to claim 5, characterized in that it has unbalance determination means (36) for determining an unbalance in size caused by the laundry item (35).
7. Household appliance (1) according to any of claims 1-2, 5-6, characterized in that the magnetic field generating means (34) for generating a dynamically variable, segmented magnetic field has at least three separate electromagnets (25 to 32).
8. Household appliance (1) according to claim 7, characterized in that the magnetic field generating means (34) for generating a dynamically variable, segmented magnetic field have six to nine separate electromagnets (25 to 32), the electromagnets (25 to 32) being arranged mutually equidistant in the direction of revolution relative to the axis of rotation (A).
9. Household appliance (1) according to claim 7, characterized in that the electromagnet (25 to 32) is arranged on the laundry drum (3) in a rotationally conjoint, positionally fixed manner with the rotational speed of the laundry drum (3).
10. Household appliance (1) according to any of claims 1-2, 5-6, 8-9, characterized in that the magnetic field generating device (34) is arranged outside the laundry drum (3), on an immersion liquid container (4) in which the laundry drum (3) is rotatably supported, and in that the azimuthal position variation of the sectionally generated magnetic field is generated synchronously with the rotation of the laundry drum (3).
11. Household appliance (1) according to claim 8, characterized in that the electromagnets (25 to 32) are inductively controlled.
12. Household appliance (1) according to claim 8, characterized in that the electromagnets (25 to 32) are controlled by radio signals.
13. Household appliance (1) according to any of claims 1-2, 5-6, 8-9, 11-12, characterized in that at least the individual compensation elements (20, 23) are at least partially ferromagnetically configured.
14. Method for operating a household appliance (1) for caring for laundry items (35) having a laundry drum (3) rotatable about a rotational axis (A) for receiving laundry items and having at least one imbalance compensation device (13, 14) having a housing (18, 21) in which a plurality of compensation elements (20, 23) are movably contained, wherein a magnetic field acting on a compensation element (20, 23) is dynamically variably generated by a magnetic field generating device (34) of the imbalance compensation device (13, 14), characterized in that, when the rotational speed of the laundry drum (3) is less than or equal to a reference rotational speed of the laundry drum (3), a magnetic field acting on a compensation element (20, 23) is generated by a magnetic field generating device (34), -a magnetic field in sectors with respect to the axis of rotation (a), wherein the azimuthal position variation of the magnetic field generated in sectors is coupled with the rotational speed of the laundry drum (3), wherein the azimuthal position of the magnetic field with respect to the magnetic field generating means (34) is dynamically variable, wherein a magnetic field for acting on a compensation element (20, 23) is generated in such an azimuthal sector (37) when the rotational speed of the laundry drum (3) is less than or equal to a reference rotational speed of the laundry drum (3), by means of which a compensation element (20, 23) for compensating the unbalance generated by the laundry item (35) is arranged.
15. Method according to claim 14, characterized in that the azimuthal position variation of the sectionally generated magnetic field is carried out at a speed equal to the rotation speed of the laundry drum (3).
16. Method according to claim 14 or 15, characterized in that the magnetic field generating device (34) for generating a dynamically variable, segmented magnetic field is configured with at least three separate electromagnets (25 to 32), which electromagnets (25 to 32) rotate with each other at the rotational speed of the laundry drum (3).
17. Method according to claim 16, characterized in that the magnetic field generating device (34) for generating a dynamically variable, segmented magnetic field is configured with six to nine separate electromagnets (25 to 32), the electromagnets (25 to 32) being arranged mutually equidistant in the direction of revolution relative to the axis of rotation (a), and the electromagnets (25 to 32) rotating together at the rotational speed of the laundry drum (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015222275 | 2015-11-12 | ||
| DE102015222275.6 | 2015-11-12 |
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| CN106906609A CN106906609A (en) | 2017-06-30 |
| CN106906609B true CN106906609B (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611001720.5A Active CN106906609B (en) | 2015-11-12 | 2016-11-11 | Household appliance for treating items of clothing and method for operating a household appliance |
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| Country | Link |
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| CN (1) | CN106906609B (en) |
| DE (1) | DE102016220112A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201800003017A1 (en) * | 2018-02-26 | 2019-08-26 | Antonio Francesco Chiriatti | Active balancer for household appliances |
| EP3536842A1 (en) | 2018-03-09 | 2019-09-11 | Vestel Elektronik Sanayi ve Ticaret A.S. | Balancing apparatus of a washing machine |
| DE102018210562A1 (en) | 2018-06-28 | 2020-01-02 | BSH Hausgeräte GmbH | Washing machine with balance ring |
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| CN102069996A (en) * | 2010-12-17 | 2011-05-25 | 杨非 | Electromagnetic driving type linear reciprocating driving device |
| CN102443999A (en) * | 2010-10-06 | 2012-05-09 | 三星电子株式会社 | Washing machine and control method thereof |
| CN103966803A (en) * | 2013-01-25 | 2014-08-06 | 三星电子株式会社 | Balancer And Washing Machine Having The Same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101295361B1 (en) * | 2006-10-26 | 2013-08-12 | 삼성전자주식회사 | Drum type washing machine |
| KR100960068B1 (en) | 2006-11-10 | 2010-05-31 | 삼성전자주식회사 | Ball Balancer and Washing Machine Having the same |
| KR101806836B1 (en) * | 2011-05-04 | 2017-12-11 | 삼성전자주식회사 | Washing machine and control method thereof |
| KR101944370B1 (en) * | 2012-10-12 | 2019-02-07 | 삼성전자주식회사 | Washing machine having the same and method of controlling the same |
| KR102091603B1 (en) * | 2013-06-13 | 2020-03-20 | 엘지전자 주식회사 | Laundry Treating Apparatus |
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2016
- 2016-10-14 DE DE102016220112.3A patent/DE102016220112A1/en active Pending
- 2016-11-11 CN CN201611001720.5A patent/CN106906609B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102443999A (en) * | 2010-10-06 | 2012-05-09 | 三星电子株式会社 | Washing machine and control method thereof |
| CN102069996A (en) * | 2010-12-17 | 2011-05-25 | 杨非 | Electromagnetic driving type linear reciprocating driving device |
| CN103966803A (en) * | 2013-01-25 | 2014-08-06 | 三星电子株式会社 | Balancer And Washing Machine Having The Same |
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| Publication number | Publication date |
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| CN106906609A (en) | 2017-06-30 |
| DE102016220112A1 (en) | 2017-05-18 |
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