EP2177657A1 - Drum for a washing machine - Google Patents

Abstract

The drum (3) has a caustic solution container, in which the drum is mounted over a horizontal or bent axle in pivoted manner. The size of segments (22) is formed differently in such a manner that a structure forms a curved sample from curved segments on a drum casing (19).

Description

The invention relates to a drum for a washing machine with a tub, in which the drum can be rotatably mounted on a horizontal or inclined axis, comprising a cylindrical shell, which is bounded by an end wall, wherein the jacket has a structure of directed towards the drum interior vaults, which consists of individual curved segments comprises.

For washing laundry in a drum washing machine, the laundry is washed with water with the addition of detergent with strong drum motion. The drum is hereby perforated, so that the water in the tub with the laundry, which is located in the drum, comes into contact. To improve the Durchbefuchtung scooping ribs are mounted in the drum, which lift the water from the lower portion of the tub upwards and distribute from there over the laundry.

From the EP 0 935 687 B1 or DE 101 62 918 A1 Such a drum for a washing machine is known. So that the laundry is spared during washing, a few holes in the drum shell are arranged with a smaller diameter, here about 2 mm. In the case of small holes, not so many fibers penetrate there during washing or spinning, as a result of which pilling or fiber detachment is avoided. The known drum has a structure of inwardly directed bulges in order to achieve a good discharge of the liquid from the drum. Furthermore, a good protection of the laundry is achieved because it can slide along the vaults very smoothly along. The bulges are in this case uniformly structured, so that the laundry movement is caused by driving ribs which are arranged distributed on the inside of the drum shell over the circumference. Here, the laundry items are raised only in the circumferential direction until it comes to detachment from the drum shell and thus the so-called laundry case. In this case, it may happen that the items of laundry curl together in a ring, so that a rolling movement with less mechanical action or mixing with the washing liquid occurs.

The invention is therefore based on the object to provide a drum with buckles, in which the mixing of the laundry with the washing liquid and the mechanical action is improved.

The object is achieved by a drum having the features of claim 1. Advantageous embodiments will become apparent from the following dependent claims.

The main advantage of the drum according to the invention is that an improved movement of the laundry within the drum is achieved when it is arranged approximately horizontally or inclined and rotated at a normal speed for the washing phase, for example 20 to 70 rpm. Furthermore, the conservation of the laundry items is maintained, so that premature wear or damage can be avoided.

For this purpose, the drum according to the invention, in particular the drum casing, comprises a structure of curvatures directed towards the interior of the drum, which consists of individual curved segments. The size of the segments is designed differently such that the structure of the curved segments on the shell or on the surface of the shell forms a curved pattern. The curved pattern causes partially different flows of the washing liquid. Furthermore, due to the curvature, sliding laundry items along the drum shell are moved somewhat in the axial direction or in the direction of a lateral edge of the drum shell, so that the items of laundry are moved even more strongly within the drum. The so-called roll effect is thereby alleviated, since the laundry items in addition to the circumferential direction in the axial direction, based on the operating installation position of the drum, moves and / or at least sporadically receive motion pulses in the axial direction. In this case, it is possible to make the otherwise common driving ribs smaller or flatter, since the washing movement is enhanced by the arch structure in the casing. Optionally, the use of driving ribs can be completely dispensed with.

In an advantageous embodiment, the pattern is formed at least S-shaped curved. As a result, force impulses or movement impulses are exerted in two opposite directions on the laundry items resting on the drum casing, so that the laundry items reciprocate in the axial direction when the drum is rotated. The directional impulses are also exerted on the items of laundry which impinge on the drum shell during the tumble, so that overall a seemingly chaotic or chaotic or inhomogeneous movement of the laundry items within the drum is formed, as in a drum with a uniform arch structure.

Overall, it is advantageous that the curved segments are formed of polygons which abut each other with their edge contours, wherein the segments have a length and a width of about 1 to 5 cm. This results in a nearly coherent arch structure, which can thereby exert particularly effective movement impulses on the laundry. The corners of the polygons, in this example honeycomb arranged 6-corner, can be rounded, so that sharp-edged transitions are avoided. The roundings in this embodiment have a radius in the range of 2 to 10 mm.

The height of the bulges is chosen so that they have about the same height and that the height is about 0.1 to 2 mm. As a result, the smaller segments are more curved in relation to their area than the larger segments, based on the base area of the respective individual segment. Thus, a partially different washing mechanism is effected, whereby the movement impulses caused by the vault structure are enhanced.

In another embodiment, the bulges each have a height which is approximately proportional to the length and width of the surfaces, wherein the height corresponds to about 1/500 to 1/20 of the width or the length of the respective segment. This can be advantageous to avoid exaggerated violent movement impulses and to achieve a gentle laundry treatment.

In order to provide the segments of different sizes, it is expedient for the segments to have at least approximately the same length in the direction of the circumference of the drum and to have a different width in the transverse direction. The size profile and the arrangement are chosen so that the S-shaped and / or multiple S-shaped, curved pattern is formed on the lateral surface in the circumferential direction of the drum shell.

In an advantageous development, the segments in the direction of the drum circumference each have a different length, so that the curved or S-shaped pattern is correspondingly formed transversely to the circumferential direction of the jacket. In combination with the circumferential curvature, the undulating pattern includes transverse and longitudinal portions, thereby increasing the inhomogeneity of the structure formed by the segments. As a result, force pulses or movement pulses are introduced in the circumferential direction and transversely to the circumferential direction of the laundry, which further improves the mixing of the laundry items in the washing liquid.

In a further expedient embodiment, the circumferentially extending S-shaped pattern, starting from the approximate centerline of the shell, has a first vertex toward the first end wall and a second vertex toward the second end wall. This ensures that the wave-shaped structure is apparent at least almost over the entire width of the drum shell.

In an advantageous development of the drum shell is divided into at least three sections, wherein in each section in each case an S-shaped pattern of curved segments is arranged. In the areas between the individual sections can be mounted driving ribs, which lift the laundry items as the drum is rotated, so that they peel off again in the upper third and fall down. The driver ribs can be very be kept flat, preferably in the range of about 1 to 2 cm with a drum diameter of 45 to 55 cm.

In a further advantageous embodiment, the curved or S-shaped pattern is formed on the jacket such that a curved or S-shaped web results without buckling or arch structure. As a result, an improved guidance of the laundry items along the curved or S-shaped, smooth web is achieved. It is expedient that the web has approximately the width corresponding to the length of a segment in the circumferential direction. Thus, so to speak, a segment width is kept free of bulges, wherein in the S-shaped embodiment of the web starts approximately in the central region or equatorial region of the shell and ends after his arcuate deflections back in the equatorial region.

In an advantageous embodiment, the width of the web varies, wherein the width of the web at the narrowest point in the central region of the drum portion or the drum circumference approximately the length of a segment and at the widest point in the apex region of the S-shaped or at the ends of the web approximately the length of 1.5 to 2 times a segment corresponds. That is, starting in the equatorial region of the shell of the web is designed to be 1.5 to 2 times wider than in the center region of the web, wherein the center of the web, based on the circumference of the drum shell, is also located in the equatorial region. The arcuate deflections of the web deviate once in the direction of the first end wall and once in the direction of the second end wall of the drum from the equatorial line.

In an advantageous development of the web is provided with additional directed towards the drum interior curved surfaces, wherein the curved surfaces each have a length in the circumferential direction of the shell of about 0.4 to 0.8 times the length of a nearest segment and a width of about the 0.4 to 0.8 times the width of a nearest segment. This further improves the guidance of the laundry items sliding along the jacket in the axial direction or in the direction of the end walls.

In the embodiment of the drum or the drum shell with holes for the passage of washing liquid, it is advantageous that the holes between the segments or in the edge contour of the segments are arranged. As a result, when the drum is rotated in the washing or spinning phase, the sliding of the items of laundry over the curvatures is not affected by holes in this area, whereby a good wash is achieved. The arrangement of a few small holes in the drum shell contributes to the laundry, the holes preferably have a diameter between about 1.8 to 3 mm.

In the embodiment in which the segments have a polygonal base, it is advantageous to provide the drum shell with holes for the flow of washing liquid and to arrange the holes in the corners of the edge contour of the segments. As a result, a good drainage is achieved, despite a small number of flood holes, whereby also in this case the diameter of the holes in the range of 1.8 to 3 mm, preferably 2 to 2.5 mm.

In the execution of the drum or the drum shell with holes for the flow of washing liquid and with one or more pronounced curved or S-shaped web / webs, it is expedient to form the web free of holes. Also in the version with the separate vault structure in the bridge, it is expedient to introduce here no holes.

Fig. 1:

eine Waschmaschine in einer skizzierten Schnittdarstellung;

Fig. 2:

die Trommel in einer perspektivischen Ansicht und

Fig. 3 bis 7:

den Trommelmantel in einer abgewickelten Ansicht in mehreren Ausführungen.

An embodiment of the invention is shown purely schematically in the drawings and will be described in more detail below. Show it:

Fig. 1:

a washing machine in a sketched sectional view;

Fig. 2:

the drum in a perspective view and

3 to 7:

the drum shell in a developed view in several versions.

In Fig. 1 is a purely schematic representation of a washing machine 1, shown with a tub 2. The position and direction information refer to the operational installation position of the washing machine 1. Within the tub 2 is a rotatably mounted on a horizontal or inclined axis 27 and driven by an electric motor 13 Drum 3 arranged in the tub 2 and in the Drum 3 located laundry items 8 moves. The drum 3 is made in the present embodiment of stainless steel and with a plurality of holes 21 (FIG. Fig. 2 ) provided for the flooding. The housing 4 has a loading opening 9, via which the interior of the drum 3 can be reached through the sealing sleeve 6. The loading opening 9 can be closed by means of the door 5. In the lower region of the tub 2, the washing liquid 7, which is needed for cleaning or treating the laundry 8. For heating or for heating the liquid 7, a radiator (not shown) is arranged in the lower region of the tub 2. In the upper part of the machine 1, an inlet valve 15 is sketched, which controls the entry of the water from the supply network. About the Einspülkasten 11, the water is passed through the connecting pipe 14 in the tub 2, wherein in the dispenser 11 entered detergent is flushed into the tub 2. Below the tub, a drain device 12 is arranged, which brings out the spent washing liquid or the rinse water 7 from the tub 2 to the drain line 16, which usually opens into a sewer. The control device 17 controls the water inlet 15, the activity of the drain device 12 and the drive motor 13, which is energized via the power unit or a frequency converter 18.

In Fig. 2 the drum 3 is shown, which consists of a jacket 19 and two opposite end walls 20, wherein here for better illustration of the inside of the jacket 19, the front end face is removed. On the inside 19a of the shell 19 are distributed over the circumference several scooping ribs 21, in this example, three, attached. The scoop ribs 21 are formed in profile V-shaped or parabolic. The drum 3 is perforated with the holes 25 (FIG. Fig. 3 ) are disposed between the domed segments 22 and have a diameter of about 1.8 to 2.5 mm, preferably 2 mm. The drum shell 19 is here divided into three sections, which are divided by the scoop ribs 21. Here, in each section, a structure of the segments 22 is formed such that a curved pattern, in this example forms an S-shaped pattern on the jacket 19. The pattern is in this case designed such that on the drum shell 19 a curved or S-shaped smooth web 24 extends in the circumferential direction U or which extends within the portion between the driving ribs 21. On the lateral surface thus a wavy structure is shown. The web 24 is not provided here with bulges or with curved segments 22. The web 24 is embedded laterally by the segments 22, so that it does not hit one of the frontal edges 19b, 19c. To form the arch structure on the drum shell 19, the segments 22 are angular, in this example 6-square executed with their contours 22a (FIG. Fig. 4a ) lie against each other and form a honeycomb arrangement.

In Fig. 3 the jacket 19 is shown as a settlement. The jacket 19 is divided in the circumferential direction U into a plurality, in this example three, sections 26, which are provided with the structure of arched, polygonal, here hexagonal segments 22. It can be seen that the segments 22 are formed differently in size with respect to their surface, such that a curved, here an S-shaped pattern of the structure results. In the middle region, a curved or S-shaped web 24 is formed, which crosses the equatorial line EQ due to its S-shape or is oriented thereon. The holes 25 are in this case arranged in the corners of the segments 22, wherein the smooth, non-arched web 24 has no holes.

In Fig. 4a is a section 26 of the jacket 19 ( Fig. 2 ) in detail. It can be seen here that all the segments 22 have approximately the same length L, wherein they differ with regard to their width B, such that a curved, here an S-shaped pattern of the structure results, wherein additionally an S-shaped web 24 is formed without segments and without bulges. The drum shell 19 is provided with holes 25 for the passage of washing liquid, the holes 25 being arranged in the areas between the segments 22 which are not curved. At the in Fig. 4a the example shown are the holes 25 in the Corner points of the edge contour 22a of the segments 22 are arranged. In Fig. 4b the jacket 19 is shown in the sectional plane AA. It can be seen here that the segments 22 have a curvature 23 towards the interior of the drum or are arched, wherein they are arranged with their edge contours 22a at a distance R from the respectively adjacent segment 22. It can be seen here that the bulges 23 have approximately the same height h, the height h being approximately 0.1 to 2 mm. It is alternatively possible to vary the height h depending on the size, ie of the length L and / or width B of the segments 22. It can also be seen here that the web 24 has no curvature. The web 24 in this case has a width of about one segment 22, as it undistorted or how it represents in its length L.

In Fig. 5a an embodiment of the drum 3 is sketched, in which the jacket 19 is provided with a wider, S-shaped web 24, as in the example according to FIG Fig. 4a the case is. The web 22 is made different in width in its course in the circumferential direction U, wherein the width B of the web 24 at the narrowest point in the central region of the drum portion 26 or the drum circumference about the length of a segment 22 and at the widest point in the apex region of the S-shaped or at the ends of the web 24 approximately the length of 1.5 to 2 times a segment 22 corresponds. The web 22 is provided with additional to the drum interior directed curved surfaces 27, wherein the curved surfaces 27 each have a length in the circumferential direction U of the shell 19 of about 0.4 to 0.8 times the length of a proximal segment 22 and a width of about 0.4 to 0.8 times the width of a nearest segment 22. The holes 25 are arranged here in the corners of the edge contours 22a of the segments 22, the web 24 with the smaller curvatures 27 is not provided with holes or hole-free. In the sectional view Fig. 5b are the curved to the drum interior segments 22, the smooth area of the web 24 and the curved segments 27 can be seen in the web 24.

Fig. 6 shows an embodiment of the drum shell 19 in an unwound representation, in which the segments 22 are formed so differently that results in a curved or S-shaped structure 28 which extends along the entire shell circumference. In this case, no vault-free web is formed, so that only the distortion of the segments 22 forms the curved or S-shaped pattern 28.

Fig. 7 shows an embodiment with a buckle-free web 24 in the middle third of the drum shell 19. The S-shape is designed so that a single S extends over the entire shell circumference. The already mentioned embodiments according to Fig. 5a and 5b with differently wide web 24 and / or with additional curved surfaces 27 (FIG. Fig. 5 ) in the web 24 can also be carried out so that a single S extends over the entire circumference of the shell.

Claims (16)

Drum (3) for a washing machine (1) with a tub (2), in which the drum (3) can be rotatably mounted via a horizontal or inclined axis (7), comprising a cylindrical shell (19) by means of an end wall (20) is limited, wherein the jacket (19) comprises a structure of inwardly directed to the drum bulges, which consists of individual curved segments (22),
characterized,
that the size of the segments (22) is formed differently, such that the structure of the arcuate segments (22) on the jacket (19) forms a curved pattern. Drum according to claim 1,
characterized,
that the pattern is formed approximately S-shaped curved. Drum according to claim 2,
characterized,
that the segments (22) in the circumferential direction (U) of the jacket (19) each have at least approximately the same length (L) and in the transverse direction (A) each have a different length, such that the S-shaped pattern in the circumferential direction (U ) of the jacket (19) is formed. Drum according to claim 1 or 2,
characterized,
that the segments (22) in the circumferential direction (U) of the shell (19) each having a different length, so that the curved or S-shaped pattern corresponding transverse (A) is formed to the circumferential direction of the shell (19). Drum according to claim 2,
characterized,
that the S-shaped pattern extending in the circumferential direction (U), starting from the approximate circumferentially (U) circumferential center line (EQ) of the shell (19), a first vertex toward the first lateral edge (19a) and a second vertex in Direction to the opposite second lateral edge (19b). Drum according to one of claims 1 to 5, characterized
characterized,
in that the drum casing (19) is divided into at least three sections (26) and in each section (26) an S-shaped pattern of arched segments (22) is arranged in each case. Drum according to claim 1,
characterized,
in that the curved segments (22) are formed by polygons which adjoin one another with their edge contours directly or at a distance (R), the segments (22) having a length (L) and a width (B) of approximately 1 to 5 cm , Drum according to claim 1,
characterized,
that the bulges (23) have approximately the same height (h) and that the height (h) is approximately 0.1 to 2 mm. Drum according to claim 1,
characterized,
that the domes (23) each have a height (h) which is approximately proportional to the length (L) and width (B) of the segments (22), wherein the height of about 1/500 to 1/20 of the width (B ) or the length (L) of the respective segment (22). Drum according to one of claims 1 to 9,
characterized,
in that the curved or S-shaped pattern is formed on the jacket (19) in such a way that a curved or S-shaped web (24) without bulges or bulge structure results. Drum according to claim 10,
characterized,
that the web (24) approximately the width (B) which corresponds to the length (L) of a segment (22) in the circumferential direction (U). Drum according to claim 10,
characterized,
that the width of the web (24) varies, wherein the width of the web (24) at the narrowest point in the center region of the drum portion (26) or the drum circumference (U) approximately the length of a segment (22) and at the widest point in the apex region or at the ends of the S-shaped web (24) corresponds approximately to the length (L) of 1.5 to 2 times a segment (22). Drum according to one of claims 10 to 12,
characterized,
in that the web (24) is provided with additional curved surfaces (27) facing the interior of the drum, the curved surfaces (27) each having a circumferential length (U) of the jacket (19) of approximately 0.4 to 0.8 times have the length (L) of a nearest segment (22) and a width (B) of about 0.4 to 0.8 times the width (B) of a proximal segment (22). Drum according to claim 1,
characterized,
in that the drum casing (19) is provided with holes (25) for the flow through with washing liquid (7), the holes (25) being arranged between the segments (22) or in the edge contour (22a) of the segments (22). Drum according to claim 7,
characterized,
in that the drum casing (19) is provided with holes (25) for the flow through with washing liquid (7), wherein the holes (25) are arranged in the corner points of the edge contour (22a) of the segments (22). Drum according to one of claims 10 to 13,
characterized,
that the web (24) is free of holes.

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