EP1945090A1 - Dishwasher with a plastic frame part which is fixed to a treatment container - Google Patents

Abstract

The invention describes a dishwasher with at least one plastic frame part (2) which is fixed to a treatment container (1), wherein the front of the treatment container (2) has a filling opening which can be closed by a door. The treatment container (2) has a container casing (10), which comprises side walls and a container roof, and also the frame part (2), wherein the frame part (2) forms a front face of the treatment container and is connected to the container casing (10) in an interlocking manner.

Description

 DISHWASHER WITH ONE ONE

MOUNT TREATMENT CONTAINERS

FRAME OF PLASTIC

The invention relates to a dishwasher, in particular household dishwasher, with a container hood at least partially made of metal, comprising a container shell of two side walls and a container roof and a rear wall, and a not belonging to the container hood rinse tank made of plastic as the bottom wall of a treatment container for receiving items to be washed and the treatment container has a closable with a door filling opening.

The treatment container of dishwashers is usually made of a high quality stainless steel. The treatment tank consists of at least two components. The so-called container casing forms the side walls as well as the roof of a container hood of the treatment container. A separately formed rear wall is part of the container hood and is liquid-tightly connected to the container shell by welding. For reasons of corrosion resistance, the components of the container hood are made of a high quality chrome nickel steel, which is relatively expensive. The use of chrome nickel steel results z. B. from the fact that the rear wall is connected to the container shell via a weld. The use of chrome nickel steel ensures that the corrosion resistance is also ensured at the welds.

For cost reasons, it would be advantageous if essential components of the container hood could be made of the simpler and cheaper chromium steel, since then the cost of production can be reduced. The problem with the connection of chromium steel with chromium-nickel steel via a weld is that so-called crevice corrosion can occur in the connection area in a dishwasher.

For this reason, as previously described, resorting to the use of the more expensive chromium-nickel steel, because otherwise corrosion in areas of constant wetting with liquid or moisture, eg. B. on welded sections and in recordings for seals may occur. A typical construction of a conventional dishwashing machine is described in US 6,045,203. The dishwashing machine disclosed therein has a curved container shell provided with a flange at the filling opening, which forms a front surface and has rounded upper corners. In order to facilitate the integration of the dishwasher into a fitted kitchen, corner pieces are detachably slipped onto the upper corners to produce rectangular upper corners. The corners and on the edges patch panels are each made of a plastic and are placed on the flange of the container hood. The corner pieces themselves are attached to the trim parts. The dishwasher described in the US publication uses high-corrosion-resistant materials during production, with expensive stainless steel being preferred. Due to the integral formation of the container shell, consisting of the side walls and the container roof, a low stability against twisting, eg during transport, is given.

From DE 44 43 920 C2 a household appliance with a treatment container is known, which has an increased stability compared to the dishwasher just described. The household appliance has to set up or to fasten side walls, in particular, if between the treatment tank and the side walls insulation (eg noise and / or heat insulation) to be arranged, a frame which also serves to set up and stiffen the device , In order to make a separation of the parts made of different materials possible in a simple manner, the DE-patent provides that at least one frame part with the treatment container form-fitting releasably connect. In order to ensure the stability, arranged on opposite sides of the treatment container frame parts with the interposition of the treatment container are positively releasably connected to each other and clamped. A frame part consists of U-shaped profile bars, wherein preferably two frames over the treatment container, one adjacent to the filling opening and one adjacent to the rear side, are arranged inverted, with the free ends of the frame legs pointing downwards. While the rinsing container is to be made of a stainless steel, the frame parts can be made of a plastic. The front U-frame forms the border of a filling opening of the washing. For this purpose, the U-frame is made of profiled bars with a substantially rectangular cross-section and has a rectangular projection, which is received in indentations of the washing. The U-frames point In addition, receptacles for side walls of a machine housing lining, for an insulating mat and for a seal on.

DE 25 43 822 and DE 24 20 302 disclose dishwashers, each having assemblies of metal and plastic. In both cases, these assemblies are joined together using a gasket. Made of plastic while each of the rinse tanks of the dishwashers are made. Behind this approach is the consideration that can be reduced by a large-scale replacement of components made of metal, which has to exist for reasons of corrosion resistance from an expensive stainless steel, plastic by reducing the cost of home appliances.

The object of the present invention is therefore to provide a dishwasher which is less expensive to manufacture.

This object is achieved by a dishwasher with the features of claim 1. Advantageous embodiments emerge from the dependent claims.

The dishwasher according to the invention, in particular household dishwasher, with a container hood at least partially made of metal, comprising a container shell of two side walls and a container roof and a rear wall, and a not belonging to the container hood rinse tank preferably plastic as the bottom wall of a treatment container for receiving items to be washed and the Treatment container having a closable with a door filling opening, wherein at the front end of the container hood a part, in particular frame part, is arranged with sealing function for rinsing liquid. The frame part is thus fixed in the region of the filling opening on the container hood, z. B. thereby the container cover is partially covered by the frame part.

The frame part preferably forms a front surface of the interior of the treatment container. In other words, this means that the container casing is "split in two." One of the essential components is the actual container casing. A further component occupying a smaller area represents the frame part. - A -

In a further embodiment, the frame part is positively and / or materially connected to the container shell.

In a further embodiment, the frame part consists of plastic. As a result, no corrosion occurs at the receiving seals.

The container casing or container casing and rear wall are preferably made of simple steel, in particular chromium steel. If the container casing and rear wall are made of simple steel, the gap area between the rear wall and the container casing is z. B. seal with an elastic mass of plastic.

In a preferred embodiment of the invention, a sealing element is provided in an overlapping section between the frame part and the container hood to prevent crevice corrosion. The sealing element ensures that no moisture or liquid can penetrate into the gap formed between the frame part and the container jacket in the overlapping section and, if appropriate, remain in it by capillary effects.

This makes it possible in a particularly advantageous manner to manufacture the container hood made of simple steel, in particular chromium steel, which can be achieved over conventional dishwashers, significant savings due to a much cheaper starting material.

According to a further embodiment of the invention, the frame part is U-shaped and slipped down with the two legs over the filling opening of the container shell. In this way, the above-mentioned overlap portion between the frame part and the container shell results. In this way, a particularly simple positive connection of these two components can be achieved.

It is particularly preferred if the sealing element is attached to the frame part. In particular, it is provided to arrange the sealing element in a receptacle of the frame part. Since the frame part in contrast to the rest of the treatment container is made of a plastic, a corresponding receptacle can be produced by a suitable design of an injection molding tool in a particularly simple manner. Would the sealing be attached to or in the container hood, so a plurality of bending operations would be necessary to make the preferred recording. This is more expensive than the preferred variant and thus increases the cost.

The sealing element consists according to a further advantageous embodiment of a different material from the frame part, in particular rubber or silicone. Other comparable substances with corresponding Shore hardness can also be used.

In a further advantageous embodiment, it is provided that the frame part has at least one further receptacle in which a door seal of the dishwasher is arranged. Optionally, the plastic frame can also be provided with a further sealing profile in the region of the front surface of the treatment container. This sealing profile is also referred to as piping.

The arrangement of the sealing element and / or the door seal on or in the frame part is particularly advantageous since the frame part can be produced together with the sealing element and / or the door seal in a two-component injection molding process. In this case, the steps of the integration of the sealing element or the door seal, which are otherwise to be performed manually, are dispensed with. The same applies, of course, if the dishwasher is to be provided with piping.

Since frame part and container shell together form a part of the treatment container, it is expedient if the frame part and the container jacket are positively connected with each other in a form-locking manner. The connection is preferably made by means of integrally formed with the frame part welding pin.

In a further advantageous embodiment, the frame part is designed such that it is designed to receive forces acting laterally and / or above and / or below. The desired stability can be achieved, for example, by forming webs which are correspondingly formed in the frame part and which are arranged at regular intervals from one another. It is particularly preferred if intersecting webs are provided. The cross-sectional profile can, for example, in Shape of a regular grid (crossing at 90 ° angle) or in the form of honeycombs.

The formation of the frame part for absorbing force is important for the short times of transport, which usually takes place with staple stackers engaging on the side of the dishwasher, and the storage in which a plurality of dishwashers can be stacked on top of each other. In this case, reduce to other housing components, which are usually made of a metal and are easily deformed due to their large area.

It is also advantageous if in the frame part a closing plate is integrally formed, which can be brought into operative connection with a closing mechanism on or in the door when closing the filling opening through the door. The closing plate, which was previously a separate component and connected to the treatment container, e.g. was connected by a screw or rivet connection, can now be integrally formed together with the frame part in the context of an injection molding process. The manufacture during assembly of the dishwasher can thereby be further simplified.

In a further expedient embodiment, the frame part is provided with a connecting element for connection to a hinge plate provided on or in the housing of the dishwasher.

In summary, the invention can be seen in the fact that the treatment container next to the container shell has a frame part which forms a part of the side walls and the container roof. In other words, the treatment container, that is, more specifically, the container shell, is formed in two parts. In this context, the term treatment tank is to be understood as meaning only that part which has side walls and tank roof. The naturally existing back wall is disregarded in this consideration. The division of the treatment container advantageously allows the use of a simple steel, in particular chromium steel, which can make the production of the dishwasher considerably cheaper. Further advantages, features and advantages of the invention will be described below with reference to the embodiment shown in FIGS. Show it:

1 shows a detail of a perspective view into a treatment container in a dishwasher according to the invention,

Fig. 2 shows a frame part for connection to a container hood, and

Fig. 3 in a cross-sectional view of the embodiment of the frame part and its connection to a container hood.

Figure 1 shows a perspective view of a section into the interior of a treatment container 1 of a dishwasher according to the invention. With a e.g. made of plastic wash tub 12 is a container hood with a container shell 10 and a frame part 2 is connected. The washing tub 12 forms the bottom wall of the treatment tank 1 and is part of a bottom part (not shown), e.g. B. for receiving device units and / or for receiving water leakage. With the bottom part of the dishwasher according to the invention is on the ground. The container hood consists of the container casing 10 and the rear wall 23 and is arranged or mounted on the bottom part or the washing tub 12. The frame part 2 and the container shell 10 are shown in the figure as the right side wall 13 of the treatment container 1, wherein the left side wall 13 and the container roof are not shown. The container shell 10, which is provided with a plurality of indentations 17 for increasing the stability, and the rear wall 23 is made of a simple steel, in particular a chromium steel. The container hood may also partially not be made of metal, eg. B. the container roof made of plastic. The frame part 2 consists of a plastic, which is manufactured for example by means of an injection molding process. In the perspective view of Fig. 1 also in the frame part 2 integrated door seal 1 1 can be seen, which takes over a sealing of the treatment container 1 against a (not visible in the figure) door of the dishwasher.

The frame part 2, which is shown in Fig. 2 in a perspective view, is provided with a plurality of webs 14, which give it a high rigidity and strength. The frame part 2, which forms a front surface of the treatment container. det, has a share in the stability of the entire dishwasher. Since this is made of a plastic, resulting in the connection with a simple steel of the treatment tank no problems in terms of corrosion resistance of the container hood. Corrosion problems would occur if the frame part 2 made of a high quality stainless steel (eg chrome nickel steel) would be made and a welded joint between these two components. Only the provision of the frame part 2 made of plastic allows the use of the simpler, less expensive material.

In addition, the choice of this material also has manufacturing advantages. Thus, for example, a locking plate 9 previously formed as a separate component can be integrally formed together with the frame part 2 during the manufacturing process with this. Similarly, a receptacle 6, which serves to receive the door seal 1 1 (see Fig. 1), are provided, wherein due to the plastic material in the receptacle 6 no corrosion can occur.

The frame section provided with the reference numeral 15, which extends from the right leg over the horizontally extending portion to the left leg of the frame member, forms a part of the side walls or of the roof in the interior of the treatment container 1. Der Rahmen- provided with the reference numeral 16 part section, which also extends from the right leg over the horizontally extending portion to the left leg of the frame part 2, however, does not face the interior of the treatment container 1 with the door closed. Rather, the frame section 16 receives a corresponding section or cutout of the door of the dishwasher and is in particular exposed to no moisture or liquid.

FIG. 3 shows a cross section through the frame part 2 as well as a section of the side wall 13. In this case, the direction of filling when loading the dishwasher is shown by the arrow provided with the reference numeral 21. From the cross-sectional view, it can be clearly seen that the frame part 2 is provided, for example, with four webs 14 which give the frame part 2 high stability. The web provided with the reference numeral 20 forms the front surface of the treatment container. In the 6, the already mentioned door seal 1 1 is used, which then rests against the frame section 16.

At the interior of the dishwasher facing the end of the frame part 2, a further receptacle 5 is formed, which is designed to receive a sealing element 4. The sealing element 4, which is formed of rubber, a silicone or a similar material with a corresponding Shore hardness, is in intimate contact with the side wall 13 and the frame part 2 at. The sealing element 4 prevents the ingress of moisture and liquid into an overlapping section 22. In particular, the sealing element 4 prevents the penetration of moisture and liquid due to a capillary effect in the region of the overlapping section 22, in which a portion of the side wall 13 on the frame section 15 of the frame part 2 is present.

The connection between the container shell 10 and the frame part 2 via so-called welding pin 19. Before the connection, the frame part is formed at the location of the welding pin 19 with a plurality of projections which are inserted through correspondingly shaped holes in the container shell. By thermally deforming the projections, which are integrally formed with the frame part 2, they can be remelted into the shape shown in FIG. 3 (also spherical-head-shaped cross-sections are conceivable), so that the welding pin has a larger diameter than the corresponding one Bore has. In this way, a secure positive and permanent connection is made. In order to ensure a secure connection between the frame part 2 and the container shell 10, the frame part 2 facing the end of the container shell 10 is bent and is also on a wall portion of the frame part 2 at.

In Fig. 3, the retraction 17 described in connection with Fig. 1 is further shown, which increases the stability of the container hood. LIST OF REFERENCE NUMBERS

1 treatment container

2 frame part

4 sealing element

5 recording

6 recording

9 closing plate

10 container jacket

1 1 door seal

12 rinse tank

13 side wall

14 footbridge

15 frame section

16 frame section

17 Moving in

18 side wall section

19 welding pins

20 footbridge

21 filling direction

22 Overlap section

23 rear wall

Claims

claims 1 . Dishwasher, in particular domestic dishwasher, with a container hood at least partially made of metal, comprising a container casing (10) which consists of two side walls (13) and a container roof, and a rear wall (23), and a washing tub (12) not belonging to the container hood ) of preferably plastic as the bottom wall of a treatment container (1) for receiving items to be washed and the treatment container (1) has a closable with a door filling opening, characterized in that at the front end of the container cover a corrosion-resistant part (2), in particular frame part (2) , with sealing function for rinsing liquid is arranged. 2. Dishwasher according to claim 1, characterized in that the frame part (2) forms a front surface of the interior of the treatment container (1). 3. Dishwasher according to claim 1 or 2, characterized in that the frame part (2) is positively and / or materially connected to the container shell (1). 4. Dishwasher according to one of the preceding claims, characterized in that the frame part (2) consists of plastic. 5. Dishwasher according to one of the preceding claims, characterized in that the container casing (10) or container casing (10) and rear wall (23) made of simple steel, in particular chromium steel exist. 6. Dishwasher according to one of the preceding claims, characterized in that in an overlap section (22) between the frame part (2) and the container casing (10) a sealing element (4) is provided for avoiding düni crevice corrosion. 7. Dishwasher according to one of the preceding claims, characterized in that the frame part (2) is U-shaped and with the two legs down over the filling opening of the container shell (10) is slipped. 8. Dishwasher according to one of the preceding claims, character- ized in that the sealing element (4) on the frame part (2) is fixed. 9. Dishwasher according to claim 8, characterized in that the sealing element (4) in a receptacle (5) of the frame part (2) is arranged. 10. Dishwasher according to one of the preceding claims, characterized in that the sealing element (4) from one of the frame part (2) different material, in particular rubber, for. As thermoplastic elastomer, or silicone exists. 1 1. Dishwasher according to one of the preceding claims, characterized in that the frame part (2) has at least one further receptacle (6) in which a door seal of the Geschirrspülmaschines is arranged. 12. Dishwasher according to one of the preceding claims, character- ized in that the frame part (2) together with the sealing element (4) and / or the door seal (1 1) can be produced in a two-component injection molding process. 13. Dishwasher according to one of the preceding claims, character- ized in that the frame part (2) and the container casing (10) are positively non-releasably or detachably connected to each other. 14. Dishwasher according to claim 13, characterized in that the frame part (2) and the container casing (10) are connected to each other by means of integrally formed with the frame part welding pin (19). 15. Dishwasher according to one of the preceding claims, characterized in that on the frame part (2) at least one piping is formed. 16. Dishwasher according to one of the preceding claims, characterized in that the frame part (2) is designed such that it is designed to receive laterally and / or upwardly and / or downwardly acting forces. 17. Dishwasher according to one of the preceding claims, characterized in that in the frame part (2) a closing plate (9) is integrally formed, which is engageable in operative connection with a locking mechanism on or in the door when closing the filling opening through the door. 18. Dishwasher according to one of the preceding claims, characterized in that the frame part (2) is provided with a connecting element for connection to a provided on or in the housing of the dishwasher hinge plate. 19. Dishwasher according to one of the preceding claims, characterized in that on the frame part (2) pins are molded, on which the side wall (13) can be latched.