CN1608157B - Drum of a washing machine with an arched structure pointing into the drum - Google Patents

Abstract

A drum of a laundry treatment machine, which is rotatably mounted in a housing of the laundry treatment machine and has at least one bottom plate and a housing, each of which is at least partially composed of a sheet metal and is provided, individually or both, with a bulge directed towards the interior of the drum, which bulge is composed of projections directed towards the interior of the drum, which projections are arranged at the intersections of a regular triangular axis pattern, wherein overflow openings for the passage of laundry lye are provided on the housing surface between the projections at the intersections of the bisectors of the triangle. In order to make these elements structurally more rigid, to improve their drainage capacity and to increase their pleasant feel, according to the invention the edges of the projections are substantially circular or elliptical or oval, the overflow holes being provided between the projections in a region adjacent to a substantially circular or oval periphery at the intersection of said bisectors, the overflow holes not cutting the periphery of the projections, wherein a partial extension of the periphery of said projections forms said periphery.

Description

Drum of a washing machine with arches pointing inwards of the drum

technical field

The invention relates to a drum for a washing machine, wherein the drum is rotatably supported within the housing of the washing machine and has at least a base and a shell, each of which is at least partly composed of a sheet and is individually Or both are provided with an arch structure pointing toward the inside of the drum, which arch structure is composed of projections pointing toward the inside of the drum, the projections are arranged at the intersection points of a regular triangular axis pattern, wherein between the projections An overflow hole for letting the washing lye flow through is provided at the intersection of the bisectors of the triangle on the surface of the shell.

Background technique

A kind of such cylinder is known by WO 98/20195. Wherein the arched structure is made of a number of hexagons arranged at least almost side by side; it is therefore generally called a honeycomb drum. The hexagonal edges have overflow holes at their corner points, these holes should have a diameter of only 2 mm according to WO 98/20195 and absolutely do not need to have funnels in order to protect the laundry even during centrifugation. Accordingly, these edge regions must have a width of 1.5 to 2.5 times the aperture diameter, ie between 3 and 5 mm.

The manufacture of a shell sheet for a laundry drum presents certain difficulties, which are also mentioned in WO98/20195. That is to say that the alignment between the pattern of holes and the cambers provided during the following manufacturing process is still problematic despite the considerable effort, so that the width of the edge must be determined more generously for tolerance reasons. However, this in turn leads to a reduction in the drainage capacity, since the laundry is always pulled into the relatively wide edge region during spin-drying. Then of course it is there to block the lye that has entered the housing area from flowing out to the overflow hole.

Furthermore, it has been shown that at high centrifugal accelerations the laundry also protrudes through these overflow openings of very small size. This combines two disadvantages; because even small holes cannot prevent damage to the clothes; these small holes significantly reduce the discharge of lye during centrifugation.

Furthermore, the production of hexagonal domes in the deep-drawing process is problematic because the corners have to be deep-drawn over a longer distance than the base line. This results in an inhomogeneous crystal structure in the deep-drawn parts of the sheet metal, which causes the material to vary in hardness. It is precisely at this corner that the overflow hole is to be punched out, and the material becomes harder, so that the inherently thinner punch has to bear more than in a conventional drum housing without arching. greater load.

Contents of the invention

The object of the present invention is to provide a drum of the kind mentioned at the outset, in which the arched structure has elements adjacent to each other, but still enough space can be provided for the overflow holes, so that these holes are sufficient for sufficient lye It also has a sufficiently large diameter for discharge. Furthermore, the manufacture of the arch is no problem either in itself or in its effect on other settings. The better rigidity achievable by the arching should at least be maintained or should be better increased.

According to the invention, this object is solved by a drum of a washing machine, which is mounted rotatably in a housing of the washing machine and has at least one base and a housing, each of which consists at least partially of a sheet metal, And either or both are provided with an arch structure pointing toward the inside of the drum, which arch structure consists of projections pointing toward the inside of the drum, which projections are arranged at the intersection of a regular triangular axis pattern, wherein between the projections An overflow hole for allowing the washing lye to flow is provided at the intersection of the bisectors of the triangle on the surface of the outer shell. According to the invention, the edges of the projections are substantially circular or oval or oval, and the overflow holes are arranged between the projections in a region adjacent to the substantially circular or oval or oval periphery At the intersection of said bisectors, the overflow hole does not interrupt the outer circumference of the protrusion, wherein a part of the extension of the circumference of the protrusion forms said circumference. Thus, arched, ball-and-socket-like projections can be designed which are exactly tangential to the respective adjacent projection at their periphery. Clothes are thus blocked from sinking into the bottom of the edge region. The deep-drawing process in the manufacture of the dome is uniform and the material remains homogeneous. Those edge regions which, due to the convex rounding, form a larger area, similar to polygonal regions, automatically provide more space for larger overflow openings. The production of such a dome is therefore much simpler than in the prior art, since such tight tolerances do not have to be observed when centering the laid dome relative to the produced bore. In addition, the described arrangement of the overflow holes results in a selected structure that increases the rigidity of the housing surface and improves the protection of the clothing during spin-drying.

Apart from the aesthetic value, the regular arrangement of the projections has the advantage that the arrangement of the axis pattern is coordinated with the arrangement of the hole pattern, which greatly simplifies production. Furthermore, the overflow hole is particularly suitable for a washing drum of a washing machine. Therefore, the arrangement of the overflow hole here has a special advantage, because the liquid that enters this part of the drum shell during centrifugation, once it reaches the inner surface of the drum shell, then from the position where these protrusions abut each other Continue to move toward the intersection point, this is because the concave table between the protrusions stretches toward the intersection point; the liquid cannot stay at the narrowest position, but moves from there to the larger area at the intersection point. area.

It is a particularly advantageous embodiment of the invention if the axis pattern has a plurality of mutually adjoining equilateral triangles on the outer surface. In this case, on the one hand, the simplification of the machining can be made to correspond to the smallest possible polygonal, here ie triangular, area of the edge regions between adjacent projections.

A refinement of the invention is suitable for general use of the structure according to the invention, in which the center line of the axis pattern is parallel to the outer edges of the housing or base, ie they are for example straight or round. This design can then be optimally applied to the dish-shaped base of a washing drum without having to create too large a raised area.

If the shallow hole at the position of the intersection point mentioned above still proves to be too dangerous for washing clothes, then according to another particularly advantageous development of the present invention, there is preferably enough space for this here, so that The overflow openings are arranged in the plane of a funnel-shaped structure arranged outwardly from the drum in the plane furthest from the drum axis. That is to say, the area at the point of intersection is large enough that a funnel-shaped structure can even be arranged, by means of which the overflow hole is led outwards from the plane of the drum shell, where according to the invention at least the clothing to reach these holes.

The minimum spacing of the protrusions should be obtained empirically, and the ratio of the protrusions to their diameters should be approximately 1/8 to 1/25. A value of about 1/10 has proven to be very suitable.

Furthermore, the ratio of the height of the protrusion to its diameter should amount to approximately 1/5 to 1/20. A value of about 1/12 has proven to be suitable.

It is particularly advantageous according to the development of the invention when arranging the raised structures on the bottom plate of the drum that the concentric lines are arranged concentrically with the center point of the bottom plate, and that the axis patterns arranged on the concentric lines have a periphery according to the respective concentric lines The shortening of the sideline that shortens towards the center point of the drum. As a result, a uniformly structured elevation can be formed on the base plate, which in turn is advantageous with regard to the congruence of the elevation structure and the hole pattern.

Accordingly, it is preferred if, according to a further advantageous development of the invention, the diameter of the projections and/or the distance between them is reduced in accordance with the shortening of the circumference of the respective concentric line. The structure of the base plate then has the advantage, besides the congruence between the raised structures and the hole pattern, that the many differently sized structural elements on the base plate also form just so many individual resonators of different acoustic frequencies, although they The resonance spectrum is broadened strongly, but its amplitude is greatly reduced for this.

If the drum is provided with a follower mounted on the inner surface of the drum shell, then according to another advantageous embodiment of the present invention, the surface of the follower can also be provided with a domed structure consisting of protrusions. . This can be advantageous for washing laundry which is mechanically treated in a wash programme.

Description of drawings

The present invention is described below based on the embodiments shown in the accompanying drawings. Shown as:

Figure 1: A three-dimensional view of a laundry drum, which is provided with raised structures on its drum shell and bottom plate;

Fig. 2: a kind of expanded sectional view of the drum shell with a kind of protruding structure with shallow overflow hole;

Figure 3: An enlarged cross-sectional view of a kind of arched protrusion along the section line III-III in Figure 2;

Fig. 4: have the overflow hole that funnel shape protrudes, be provided with according to the unfolding sectional view of the cylinder shell of protruding structure form of the present invention;

Figure 5: An enlarged cross-sectional view of a kind of arched protrusion along the V-V section line in Figure 4;

Figure 6: Partial view of a base plate provided with a raised structure.

Detailed ways

The laundry drum shown in FIG. 1 is rotatable about an at least approximately horizontal axis 2 . For this purpose it is connected to a transmission not shown here. The front of the drum 1 is open. It can be either enclosed by a co-rotating end panel or supported on a fixed end panel (neither shown). On the rear, the roller is firmly connected to a base plate 3 into which the drive torque can be transmitted. The base plate has a star-shaped embossment 4 which is only partially visible here and serves to increase the stability of the base plate. It can additionally be reinforced on its back with a cast star structure not shown. However, the drum 1 is substantially formed by a shell 5, which consists of a strip that is bent into a cylindrical shape and fastened at a point not visible here with a connecting seam.

The expansion of the bottom plate 3 and the cylinder shell 5 produces a raised structure in an embossing tool before they are joined together, which will be explained below. The projections 6 are all the same size on the drum shell 5, while the bottom plate 3 also has the largest projection 8 on its largest concentric circle, and continues to have a projection 9 towards the center on all smaller concentric circles To 15, their diameters are progressively smaller. The projections 6 can thus be arranged on the drum shell 5 and the projections 8 to 15 on the bottom plate 3 , each in a triangular arrangement relative to one another, as will be described in more detail below.

It can be seen from the expansion of a part of the drum shell 5 shown in Fig. 2 that the protrusions 6 (see Fig. 3) formed by a ball-and-socket-like imprint punched inward from the drum are arranged in a regular polygonal axis pattern, also It is at the intersection of a triangular axis pattern. This axis pattern is determined by a concentric line 16 and two further axes 17 and 18 , wherein the concentric line 16 is parallel to the outer edge 19 of the drum shell strip. The two axes 17 and 18 are each deflected by 60° to the left to the concentric line 16 or to the right by 60°. All axes accordingly have copies arranged parallel to one another, all with the same distance. A number of equilateral triangles are thus formed, one of which (20) is here shown hatched, the corners E, F and G of which are simultaneously the intersections of the axes 16, 17 and 18 or 18-2. The bisector 21 of this triangle intersects the center of gravity of the triangle, which is at the same time the point of intersection 22 and the location at which an overflow opening 23 is arranged in each case.

As a result of this construction, between the projections 6 at the center of gravity of the triangles E, F, G - a triangle is likewise formed here - a region 24 which has a sufficiently large area for the arrangement of a sufficiently large overflow hole 23, Even if their position is not exactly in the center due to a possible offset between the hole pattern and the raised structure, the overflow hole does not cut off the circumference of the raised 6. This increases the rigidity of the drum shell 5 or the bottom plate 3 with such a structure; since in the prior art the perimeter line of the arched structural element is cut and its bending stiffness is interrupted at the point of tangency. This reality can be clearly seen from Figure 3.

It can be known from experiments that the distance A between the protrusions 6 is determined to be 1/8 to 1/25 of its diameter, preferably 1/10. Also on the one hand to ensure the best washing effect, while on the other hand to ensure maximum protection of clothing when centrifugal dehydration, the optimum value of the height H of this protrusion 6 is 1/5 to 1 of the diameter of the protrusion /20, preferably 1/12. The realization of clothing protection during centrifugal dehydration is of course also related to the diameter of the overflow hole, in the example shown its optimal value can reach about 3.5 mm. This value is also suitable for a good drainage, which is supported by a good drainage between the protrusions 6 .

The example of embodiment of the housing plate 5 shown in FIGS. 4 and 5 is identical to the example according to FIGS. 2 and 3 with regard to the arrangement of the projections and the overflow holes. However, the structure of the overflow hole improves the protection of the clothes during spinning. For this purpose, the overflow openings 25 are arranged in the triangular regions 24 between the projections 6 in a base plane 26 of the funnel-shaped recesses 27 drawn outward ( FIG. 5 ). Thereby the washing clothes that are positioned between the protrusions 6 during centrifugal dehydration are just difficult to penetrate very far in this recessed portion 27, thereby just reaching this overflow hole; Dangerous edges on the outer edge of the

This example has illustrated why the circular, elliptical or oval convex structure of the present invention has such great advantages compared with the prior art; For arranging a sufficiently large overflow opening 25 , space is even provided for the accompanying recess 27 for the overflow opening 25 without, for example, thereby cutting through the circumferential line of the arched structural element 6 .

An example of a raised structure is shown in FIG. 6 representing a portion of the thin plate of the bottom plate 3 (FIG. 1). The outer edge 28 of the base plate 3 is at the same time the outer boundary of the area in which the raised structures can be arranged. The inner boundary of this area is defined by line 29 . The basic structure of the raised means and hole pattern corresponds to that in FIGS. 2 and 4 .

Of course, the concentric line 30 - 1 and all its inner parallel lines 30 - 2 , 30 - 3 etc. are concentric circles corresponding to the axis 16 in FIG. 2 in a state parallel to the outer edge 28 . Correspondingly the other axes 31 and 32 (to the right or to the left respectively deviate from the concentric line 30-1 approximately 60°) are bent toward the center of the circle, so that the sides of the triangle formed by them shorten as they get closer to the center of the circle, which At a distant intersection point M of two drawn radius lines R. This means that the edge F-K of the triangle F, K, L which is located further inside is shorter than the edge E-F of the triangle E, F, G which is located further outside. The same is true for the other respective comparable sidelines. In addition, the diameter of the protrusion 6 is also smaller as it gets closer to the center M, because the inner concentric line 30-2 is shorter than the outer concentric line (30-1) and therefore only shorter for the same number of protrusions 6 distances are available. This also accounts for the shortening of the sides of the triangle described and the bending of the axis lines 13 and 32 .

If in the washing drum shown in Fig. 1 there is provided a follower not shown here for lifting the clothes when the drum rotates, then the surface of the follower pointing toward the inside of the drum can also be designed with corresponding protrusions. structure. This may be advantageous in certain ways for the mechanical treatment of laundry.

This type of arch structure can also be applied to the laundry drum of the dry cleaning machine.

Claims (12)

1. A drum (1) of a washing machine, wherein the drum is rotatably supported in a machine housing of the washing machine and has at least one base plate (3) and a housing (5), each of which is at least partially Consists of thin plates and individually or both are provided with a dome pointing towards the inside of the drum consisting of protrusions (6) pointing inward of the drum arranged on a regular triangular axis At the intersections (E, F, G) of the patterns (16, 17, 18) where on the housing surface (5) between the protrusions (6) at the intersection of the bisector (21) of the triangle (E-F-G) (22) place is provided with the overflow hole (23) that is used to make laundry lye flow through, it is characterized in that, the edge of protrusion (6) is circular or ellipse or oval substantially, and overflow hole (23) is in a portion (24) adjacent to a substantially circular or elliptical or oval periphery is arranged between the projections (6) at the intersection (22) of said bisectors (21), The overflow hole does not cut off the outer circumference of the protrusion (6), wherein a part of the extension of the circumference of the protrusion (6) forms the outer circumference. 2. The drum as claimed in claim 1, characterized in that the axis pattern (16, 17, 18) contains a plurality of mutually adjoining equilateral triangles (E-F-G) on the outer shell surface (5). 3. The drum according to any one of the preceding claims, characterized in that the concentric lines (16, 30-1, 30-2, 30- 3) Parallel to the outer edges (19, 28) of the housing (5) or base plate (3). 4. The drum according to claim 1 or 2, characterized in that the overflow hole (23) is arranged in a plane (26) of a funnel (27) facing outwards from the drum from the drum axis (2) . 5. The roller as claimed in claim 1, characterized in that the minimum distance (A) between the projections (6) is approximately 1/8 to 1/25 compared to their diameter. 6. Roller according to claim 5, characterized in that the distance (A) is approximately 1/10 compared to its diameter. 7. The roller as claimed in claim 5 or 6, characterized in that the height (H) of each protrusion (6) is approximately 1/5 to 1/20 compared to its diameter. 8. Roller according to claim 7, characterized in that the height (H) is approximately 1/12 compared to its diameter. 9. The drum according to claim 3, characterized in that, the drum has a base plate (3) with an arched structure, and the concentric lines (30-1, 30-2, 30-3) are opposite to the base plate (3) The center (M) of the center (M) is concentrically arranged, and the axis pattern (30, 31, 32) arranged on the concentric line (30-1, 30-2, 30-3) has a center (M ) corresponding to the shortened perimeter (F-K) of the respective concentric lines (30-1, 30-2, 30-3). 10. The roller according to claim 5, characterized in that the diameter of the projections (6) and/or the distance (A) between them decreases according to the shortening of the circumference of the corresponding concentric line (30-2) . 11. Drum according to claim 1 or 2, characterized in that it has a follower arranged on the inner surface of the drum shell (5), the surface of which is likewise provided with a protuberance formed by an arched structure. 12. Roller according to claim 3, characterized in that the concentric lines are straight or circular.

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