EP1028189A2 - Laundry washing machine with a drum having a structured surface - Google Patents

Abstract

The clear width of the ducts (9) is smaller than that of the raised sections (7) at the height of the inner drum surface. The drum (1) is cylindrical or conical and the openings (5) for the washing solution are distributed evenly in the indentations (9).

Description

The present invention relates to drum washing machine with a laundry drum for the laundry, the laundry drum having at least one drum jacket has, in the passage openings for the alkali and / or on the inner surface thereof Elevations pointing towards the axis of rotation are formed, which increase with Alternate wells.

Waschlauge" oder Lauge" gebraucht sind, soll selbstverständlich jede Art von Flüssigkeit gemeint sein. Waschmaschinen werden zum Waschen und Pflegen von unterschiedlichsten Gebrauchstextilien seit langer Zeit umfangreich eingesetzt. In vielen privaten Haushalten ist die Waschmaschine ein essentieller Gebrauchsgegenstand, an den hohe Anforderungen gestellt werden. Eine moderne Waschmaschine soll umweltverträglich sein, möglichst wenig Energie verbrauchen und zusätzlich eine hervorragende Waschleistung erzielen. Die Waschleistung konnte im Zusammenwirken mit gesteigerter Waschmittelqualität und günstiger Dosierung weitestgehend optimiert werden. Allerdings läßt sich gerade bei häufigem Waschen von Gebrauchstextilien ein Verschleiß der Wäschestücke nicht völlig verhindern. Moderne Freizeitbekleidung, die aus hochwertigen, beispielsweise atmungsaktiven Textilfasern hergestellt wird, rechtfertigt einen hohen Kaufpreis. Waschmaschinen des Standes der Technik könnten vor allem beim Schleudern hinsichtlich der Faserschonung vor allem teurer Wäschestücke verbessert werden. Der Verschleiß der Wäschestücke beim Schleudern wird vor allem durch die mechanische Belastung der Wäschestücke an den Durchtrittsöfnnungen (sogenannte Flutlöcher) im Trommelmantel hervorgerufen.Where the terms below

Wash liquor "or Of course, any kind of liquid should be used. Washing machines have been used extensively for washing and caring for a wide variety of consumer textiles. In many private households, the washing machine is an essential commodity with high requirements. A modern washing machine should be environmentally compatible, consume as little energy as possible and also achieve excellent washing performance. The washing performance was largely optimized in combination with increased detergent quality and favorable dosage. However, wear of the laundry items cannot be completely prevented, especially with frequent washing of everyday textiles. which is made of high-quality, for example breathable textile fibers, justifies a high purchase price in terms of protecting the fibers, especially expensive items of laundry can be improved. The wear of the laundry items during the spin cycle is caused above all by the mechanical loading of the laundry items at the passage openings (so-called flood holes) in the drum jacket.

In washing machines of the prior art penetrates during the washing process Wash liquor from the tub through a variety of openings in the drum jacket into the inside of the laundry drum. Through the same openings the wash liquor leaves the drum while pumping and Fling. In washing machines of the prior art, the inside of the Drum jacket cylindrical and evenly formed and only by the Passages interrupted. The tulip-shaped openings have sharp cut edges outside of the drum and can Spin Threats to the fibers of the laundry items pressed through them.

This risk of mechanical damage to the textile fibers of the laundry items are mainly caused by roughening or cutting or overstretching of the smallest fiber elements, which leads both to the optical effect of the Fading of the color as well as a noticeably rough surface of the textiles leads.

In order to improve the appearance of frequently washed textiles, in DE 44 37 986 A1 describes a method for structuring the curvature of thin material webs and films proposed that also for the manufacture of a drum shell Washing machines can be used. This procedure uses thin Material webs or foils over a support contour roller, on which staggered, square or hexagonal support elements are attached, guided and then vaulted in its surface due to external overpressure or internal underpressure. DE 44 37 986 A1 thus describes a forming process in which a Bending deformation of the material takes place with a very low material shrinkage. There are curvatures in the material web that act as vaulted structures or Indentations.

A disadvantage of this prior art method is in particular that material surfaces only slightly dented. Especially for manufacturing of a drum jacket for a washing machine has the method of DE 44 37 986 A1 has considerable disadvantages. A drum jacket made in this way does not allow efficient protection of the textile fibers, especially when spinning, because the laundry items with the sharp edges of the passage openings still in Come into contact and the mechanical fiber damage can not be prevented can.

Furthermore, from DE 44 45 669 A1 washing machines are known, in which the Drum jacket has vaulted textures on its inside, as regular Raises and depressions are formed. The sharp-edged openings are provided in the center of the wells, being in pairs arranged depressions are surrounded by four ridges. Disadvantage of this State of the art is that due to the centrifugal forces acting on them Place items of laundry smoothly on the ridges and valleys when spinning. So, on the one hand, good drainage of the laundry is not achieved because the laundry items cover the openings and thus "clog". On the other hand the items of laundry are additionally placed on the sharp edges of the passage openings pressed, causing mechanical damage to the fibers and the already described consequences leads.

The present invention is therefore based on the object of a drum washing machine to propose a quick removal of the during the spinning Wash liquor enables and the mechanical damage to the textile fibers is evident is reduced or avoided entirely.

This is achieved in a drum washing machine described at the outset solved that the depressions are designed as channels, the clear width in The height of the inner surface of the jacket is significantly less than the width of the elevations. The inventive configuration of the drum washing machine ensures that that the laundry is not during the washing process and when spinning comes into contact with the through openings in the drum shell, will continue achieved that the washing liquor can be drained away quickly when spinning and mechanical damage to the textile fibers are largely prevented. Due to the formation of the wells, the items of laundry cannot be placed in them penetrate and thus no longer hinder the drainage of the wash liquor.

The laundry drum advantageously has a substantially cylindrical shape on. When spinning, the wash liquor to be removed is evenly distributed the inside of the drum shell, which ensures a maximum discharge of the Wash liquor is reached from the laundry drum.

In a particularly preferred embodiment, the laundry drum has an im essential conical shape due to the conical shape of the laundry drum Centrifugal centers that direct and effectively drain the wash liquor allow.

The passage openings for the wash liquor are advantageously uniform distributed in the wells. This will touch the through openings avoided by the laundry and the textile fibers are protected from damage protected. The suction effect on the openings in washing machines of the prior art acts on the laundry items and significantly to tissue distortion and destruction is effectively prevented.

In the particularly preferred embodiment, the passage openings are for the Soapy water is limited to areas on the drum jacket that are against the laundry due to additional covers on the inside of the drum casing shielded. Three carriers are particularly preferably provided as covers, both for the circulation of the laundry as well as for the lye creation and discharge are required.

Furthermore, the increases on the drum shell are advantageous, which to the Have laundry, designed as essentially flat surfaces. This will ensures that the items of laundry when spinning against them, facing them Optimally create surfaces and avoid tissue distortion.

The elevations on the inside of the drum shell are advantageously in Rows arranged side by side distributed around the circumference of the drum shell. she thereby form an interrupted shape of ribs, both in the axial direction and can also run transversely to the axial direction of the laundry drum. This rib structure allows in particular an inexpensive manufacture of the inside of the drum shell.

In an alternative preferred embodiment, the ridges are on the inside of the drum casing in rows and preferably at right angles running columns arranged around the circumference of the drum shell and form thereby a network or knob structure. The volume of the wells that as Channels are formed, is also enlarged compared to the rib structure, which allows more wash liquor to flow in the channels and still when spinning is removed more quickly from the laundry drum. So for the whole Washing process takes less time.

Advantageously, the elevations on the inside of the drum shell rounded edges and rounded corners to those adjacent to the elevations Deepening. The textile fibers are protected particularly efficiently because there are no points of friction on the inside of the drum shell due to the rounded Corners and edges result.

Spin-off lye below the adjacent laundry items is particularly good drain off when the depressions on the bottom according to another advantageous Embodiment of the invention are wider than the level of the inside of the drum shell.

The elevations and depressions can be particularly gentle on the laundry Training of the invention may be attached to at least one part, which on the Is attached to the inside of the drum shell. Such parts are advantageously on to arrange the inside of the drum shell through openings and hold the Laundry items effectively away from these openings. The hurled Lye can then on particularly suitable edges of the parts underneath them Parts flow and reach the passage openings there.

Fig. 1

eine schematische Darstellung des Trommelmantels der Wäschetrommel mit Erhöhungen und Vertiefungen an der Innenseite des Trommelmantels und Durchtrittsöffnungen für die Waschlauge,

Fig. 2

eine Ausschnittsvergrößerung des Bereichs Y aus den Fig. 1 als Draufsicht auf die Erhöhungen und Vertiefungen mit Durchtrittsöffnungen für die Waschlauge,

Fig. 3

eine Ausschnittsvergrößerung des Bereichs Y in Fig. 1 als Querschnitt der Erhöhungen und Vertiefungen mit Durchtrittsöffnungen für die Waschlauge,

Fig. 4

Zwei andere Ausformungen des Bereiches Y in Fig. 1 in einer Ausschnittvergrößerung gemäß Fig. 3 und

Fig. 5

einen schematischen Querschnitt einer besonders bevorzugten Ausführungsform für eine Wäschetrommel als Labyrinthtrommel mit Erhöhungen und Vertiefungen an der Trommelmantelinnenseite sowie Mitnehmem.

Further details, features and advantages of the invention will become apparent from the following description with reference to the drawings. Show in it

Fig. 1

1 shows a schematic representation of the drum jacket of the laundry drum with elevations and depressions on the inside of the drum jacket and passage openings for the wash liquor,

Fig. 2

2 shows an enlarged section of area Y from FIG. 1 as a plan view of the elevations and depressions with through openings for the wash liquor,

Fig. 3

2 shows an enlarged section of area Y in FIG. 1 as a cross section of the elevations and depressions with through-openings for the wash liquor,

Fig. 4

Two other configurations of the area Y in FIG. 1 in an enlarged detail according to FIGS. 3 and

Fig. 5

a schematic cross section of a particularly preferred embodiment for a laundry drum as a labyrinth drum with elevations and depressions on the inside of the drum shell and driver.

A laundry drum 1 (Fig. 1) of a drum washing machine according to the invention (not shown) has a cylindrical drum shell in the example shown 3 on the with a plurality of openings 5 for the wash liquor is provided. The wash liquor penetrates through the openings 5 during the Washing process from the tub 11 surrounding the laundry drum 1 (not shown in FIG. 1) into the interior of the laundry drum 1. After washing the wash liquor leaves the drum when pumping out or spinning 1 through the openings 5 in the drum jacket 3. The inside of the The drum jacket has elevations 7 which alternate with depressions 9. In the example shown, the depressions form a net-like knob structure, the elevations 7 being wider than the depressions 9. The depressions 9 form Channels in which the washing liquor flows off when spinning and the washing drum 1 through the passage openings arranged in the channels, for example 5 leaves. Due to the small width of the recesses 9, the laundry items can do not attach to the bottom of the channels when spinning. They therefore form in contrast to the state of the art of draining alkali there is no resistance. In addition, the rounded corners and edges of the elevations 7 Tissue strains and damage to the textile fibers are completely avoided.

FIG. 2 shows an enlarged section of area Y from FIG. 1. To see the knob structure formed by elevations 7 and depressions 9 Drum jacket inside 3 of the laundry drum 1. The passage openings 5 are here evenly arranged in the channels formed by the recesses 9.

3 shows a cross section through the knob structure from FIGS. 1 and 2, the through openings 5 can be seen at the deepest points of the depressions 9 are.

Another, particularly advantageous structure is formed by elevations 71 and depressions 9 according to a in Fig. 4 on the left of the line of symmetry 8 in cross section like 3 enlargement of the area Y shown in FIG Items of laundry particularly effectively kept away from the bottom of the recesses 9 because it just stretched across the narrow spaces between the outer edges the elevations 7 can lay. A similar gentle laundry treatment leaves with an arched shape of the ridges 72 according to the right of the Achieve symmetry line 8 structure shown. Here are - unlike in the example 3 - no through openings 5 are provided at the bottom of the depressions, because - as described below - in a different form and elsewhere can be arranged.

The exemplary embodiment in FIG. 5 represents an alternative embodiment of the laundry drum 1 of the drum washing machine according to the invention (not shown) This laundry drum 1 is designed as a labyrinth drum 1, the one Has drum shell 3, on the inside of elevations 7, which are with depressions 9 alternate, are provided. In this advantageous embodiment the passage openings 5 are limited to the areas below the driver 6, and the depressions 9 of the drum casing 3 have no through openings 5 on. The recesses 9 form due to their small width, as already previously described, narrow channels between the flat elevations 7. When The lye is spun from inside the labyrinth drum 1 in the recesses 9 passed to the drivers 6, where the labyrinth drum 1 Through openings 5 are located. The lye passes through the passage openings 5 into a second, outer drum jacket 4 and from there into the tub 11. The lye is then pumped out of this.

Claims (11)

Drum washing machine with a laundry drum (1) for the laundry, the laundry drum (1) has at least one drum jacket (3) in which through-openings (5) for the alkali and / or on the inner surface thereof have elevations (7) pointing towards the axis of rotation are formed, which alternate with depressions (9), characterized in that the depressions (9) are designed as channels, the clear width at the level of the inner surface of the jacket is significantly smaller than the width of the elevations (7). Drum washing machine according to claim 1, characterized in that the Laundry drum (1) has a substantially cylindrical shape. Drum washing machine according to claim 1, characterized in that the Laundry drum (1) has a substantially conical shape. Drum washing machine according to one of claims 1 to 3, characterized in that the passage openings (5) for the wash liquor in the Wells (9) are arranged evenly distributed. Drum washing machine according to one of claims 1 to 3, characterized in that the passage openings (5) for the wash liquor on areas are limited on the drum jacket (3) against the laundry additional covers on the inside of the drum casing (3) (6) are shielded. Drum washing machine according to one of claims 1 to 5, characterized in that the elevations (7) on the drum jacket (3) essentially have flat surfaces facing the laundry. Drum washing machine according to one of claims 1 to 6, characterized in that that the ridges (7) on the drum jacket (3) in rows next to each other are distributed around the circumference of the drum casing (3). Drum washing machine according to one of claims 1 to 6, characterized in that that the ridges (7) on the inside of the drum shell (3) in rows and columns next to each other on the circumference of the drum casing (3) are distributed. Drum washing machine according to claim 7 or 8, characterized in that that the elevations (7) on the inside of the drum shell (3) rounded Edges and corners to the depressions adjacent to the elevations (7) (9). Drum washing machine according to one of the preceding claims, characterized characterized in that the depressions (9) are wider at the bottom than at height the inside of the drum casing (3). Drum washing machine according to one of claims 1 to 10, in particular according to claim 10, characterized in that the elevations (7) and. Wells (9) are attached to at least one part, which is on the inside the drum shell (3) is attached.

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