DE102011080621A1 - Spray arm arrangement of a dishwasher - Google Patents

Abstract

The invention relates to a spray arm arrangement for a dishwasher (300), in particular household dishwasher (300), comprising a spray arm (200) and a holding element (100) for holding the spray arm (200), wherein the spray arm (200) is rotatably mounted on the holding element (100 ), wherein for rotatable mounting at least one bearing portion (120) and at least one abutment portion (220) are provided, and wherein the bearing portion (120) has recesses (122). The recesses (122) of the bearing portion (120) have a widening shape. The invention further relates to a dishwasher (300) with such a spray arm arrangement, and to a holding element (100) for holding a spray arm (200) of a dishwasher (300).

Description

The invention relates to a Sprüharmanordnung for a dishwasher, in particular domestic dishwasher, comprising a spray arm and a holding element for holding the Sprüharms, wherein the spray arm is rotatably mounted on the holding element. The invention further relates to a dishwasher with such a Sprüharmanordnung, and a holding member for holding a spray arm of a dishwasher.

State of the art

A dishwasher has a rinsing container in which items to be cleaned can be accommodated. The cleaning of the items to be washed, in which the dishwasher can in particular pass through a washing program selected by a user, typically comprises different program sections carried out with water or rinsing liquid.

Usually, the rinsing liquid accumulating in a bottom area or sump of the washing container is sucked in with a circulating pump and supplied to a spraying system. The rinsing liquid can be sprayed onto the items to be washed and an effective cleaning can be achieved via the spraying system. The spray system may comprise an upper and a lower spray arm, which are each rotatably mounted, and provided with cleaning nozzles. The cleaning nozzles are designed to emit spray streams upon supply of pressurized rinse water. The nozzles are further arranged or aligned such that a rotational movement of the respective spray arm is caused by the recoil occurring in this case.

In a known dishwasher, the upper spray arm is rotatably arranged on a holding element via a bearing (rotary or sliding bearing), wherein the holding element is further connected to a feed pipe. About the holding element, which is also referred to as "closure", coming from the inlet pipe and pressurized rinsing liquid can be deflected and forwarded to the spray arm. For guiding or supporting the spray arm on the holding element an upper and a thereto (axially) offset lower bearing point are provided, wherein at the two bearing points encircling bearing portions of the holding element are enclosed by corresponding abutment portions of the spray arm. With the supply of rinsing liquid also a (small) part of the rinsing liquid is forced through the bearing points (i.e., the present column), whereby a corresponding lubrication can be achieved. The associated leakage can be neglected.

A cleaning of items to be washed typically has the consequence that the rinse liquid is mixed with dirt particles. Part of the dirt is filtered out via a sieve system, with smaller, not removed dirt particles remaining in the rinsing liquid. With regard to the spray arm arrangement described above, such dirt particles can therefore reach the spray arm bearing or the two bearing points together with the rinsing liquid, and be introduced into the bearing gaps. So that this does not lead to a blocking of the Sprüharmbewegung, the bearing portions of the retaining element are provided with recessed "free spaces" or recesses, so that in each case one (by the recesses) interrupted guide surface is present. The recesses, which are designed rectangular shape, serve to flush away coming to the bearings dirt particles to the outside, and thereby ensure the Sprüharmfunktion.

With heavy dirt entry into a bearing, in particular the upper of the two bearings, however, it can lead to a buildup of dirt in the grooves or recesses with the result of clogging the same. This can result in high friction forces in the pivot bearing, whereby the spray arm can be blocked. This problem increases with decreasing drive moment of the spray arm. Especially with a small spray arm with small Sprüharmlänge it can come due to the small lever arm reinforced blocking.

Disclosure of the invention

The object of the invention is to provide an improved solution for a Sprüharmanordnung a dishwasher to prevent blocking of a spray arm even with a heavy dirt entry into a storage location.

This object is solved by the features of the independent claims. Further advantageous embodiments of the invention are specified in the dependent claims.

According to the invention, a spray arm arrangement for a dishwasher, in particular a household dishwasher, is proposed. The spray arm assembly includes a spray arm and a support member for holding the spray arm, wherein the spray arm is rotatably supported on the support member. For rotatably supporting the spray arm on the holding element (at least) a bearing portion and (at least) an abutment portion are provided. The bearing portion further has recesses which have a widening shape.

In the above-described rectangular recesses of the conventional Sprüharmanordnung occurring during heavy dirt entry into a bearing accumulation of dirt can cause the dirt is not reliably flushed due to the parallel groove design. This can lead to the above-described blocking of the spray arm. The reason for this is that in each case the same cross-sectional area is present at the inlet and outlet of a groove.

Compared with the parallel groove, the widening or broadening shape of the recesses provided in the spray arm arrangement according to the invention offers the possibility that the groove cross-sectional area for the dirt particles in the outlet direction (surroundings) increases. In this way, the dirt entering the spray arm bearing in the rinsing mode can be more easily removed or rinsed out so that dirt buildup and jamming of the rotatable spray arm can be prevented. The consequence of this is a reduced bearing friction, and increased dirt compatibility of Sprüharmlagers. This is particularly advantageous for the case of a relatively small spray arm length of the spray arm used.

The provision of flared recesses may further be made - as compared to a "normal" enlargement of the bearing gap - without a change in the spray arm bearing leakage (due to leaking flushing fluid in the bearing). In this regard, the cross-section at the entrance of the flared recesses may be the same as in rectangular recesses of a conventional Sprüharmanordnung, whereby the hydraulic cross-section of the respective bearing remains the same. The design with widening "free spaces" thus has no pressure drop to cleaning nozzles of the spray arm, and therefore no effect on the cleaning performance result.

In a preferred embodiment, the retaining element has the bearing portion with the recesses, and the spray arm on the associated abutment portion. In this case, the bearing portion is enclosed by the abutment portion.

In a further preferred embodiment, the recesses of the bearing section have mutually obliquely extending side walls or side surfaces. Such a "double bevel" or V-shape allows reliable removal of dirt particles. Also, such a form can be relatively easily trained.

In a further preferred embodiment, the bearing section has (additionally) a mold separation region. The mold separation region has a shape running obliquely to the abutment portion. The mold separation area, which may be provided with corresponding Entformungsschrägen, offers the possibility of easy production of the bearing portion having plastic component by injection molding. The obliquely extending to the abutment portion contour allows, similar to the flared recesses, present in the outlet direction cross-sectional enlargement of the bearing gap. In this way, easy flushing away of dirt can be achieved even in the region of the mold separation area.

In a further preferred embodiment, a further bearing section and a further counter bearing section are provided for rotatably supporting the spray arm on the retaining element. In this case, the further bearing section recesses in order to cause a flushing of dirt particles. In this embodiment, the above-described bearing portion and the associated abutment portion may form a first or upper bearing point, and the further bearing portion and the further abutment portion for this purpose (axially) offset second or lower bearing point of the Sprüharmanordnung. In this way, a reliable pivotal mounting of the spray arm can be achieved. The holding element may further be designed such that in a region between the two bearing points rinsing liquid in the spray arm (um-) can be passed.

With regard to the further bearing section and the further abutment section, provision may also be made for the further (or lower) bearing section with the recesses on the retaining element and the further (or lower) abutment section to be provided on the spray arm, the further abutment section being the further one Bearing section encloses.

In order to promote the rinsing out of dirt particles, it may moreover be provided to also form the recesses of the further (or lower) bearing section with a widening shape, in particular with side walls running obliquely to one another, which is connected to a cross-sectional enlargement in the outlet direction.

In a further preferred embodiment, the holding element has a holding section on which the spray arm is supported. During a rotational movement of the spray arm (or on the holding portion supporting portion) to slide on the holding section along.

According to the invention, a dishwashing machine, in particular a household dishwasher, is proposed which comprises a spray arm arrangement according to one of the embodiments described above. The widening shape of the recesses of the bearing portion in this case allows easier removal of dirt particles, whereby blocking of the rotatably arranged on the holding element spray arm can be avoided.

In a preferred embodiment, the holding element is attached to an inlet pipe of the dishwasher. For this purpose, for example, a configuration in the form of a bayonet closure come into consideration. For this purpose, for example, the holding element may be provided with laterally projecting locking elements, and the inlet pipe with recesses for receiving the locking elements.

According to the invention we further proposed a holding element for holding a spray arm of a dishwasher. The holding element is designed for rotatable mounting of the spray arm and has (for this purpose) a bearing section having recesses. The recesses of the bearing section have a widening shape. The widening or broadening shape of the recesses in this case allows an enlargement of the cross-sectional area in the outlet direction, whereby dirt, which is introduced into a bearing formed by the bearing portion of the retaining element and an associated abutment portion of the spray arm bearing position in the flushing operation can be relatively easily rinsed again. The widening recesses thus allow a reduced bearing friction, and increased dirt resistance.

The holding element, which can also be designed in the manner described above for attachment to a feed pipe of the dishwasher, can also be used to retrofit a dishwasher, to a conventional holding element, which (except) can be made identical except for the recesses (substantially) replace. For the (retrofittable) holding element can also the above-described embodiments such as mutually oblique side walls of the recesses (V-shape), the provision of a sloping mold separation region, the provision of a further storage section with (preferably flared) recesses, the provision of a holding section, etc. come into consideration.

The above-described and / or reproduced in the dependent claims advantageous embodiments and refinements of the invention can - except for example, in cases of clear dependencies or incompatible alternatives - individually or in any combination with each other are used.

The invention and its advantageous embodiments and developments and their advantages will be explained in more detail with reference to figures. Each shows in a schematic schematic diagram:

1 a schematic side view of a Sprüharmanordnung for a dishwasher, comprising a fixed to a feed tube holding member and a rotatably mounted on the holding member of the spray arm;

2 a schematic plan view of the Sprüharmanordnung of 1 ;

3 and 4 perspective views of a further embodiment of a holding element which is provided with mold separation areas;

5 a perspective sectional view of a Sprüharmanordnung comprising the holding element of 3 and 4 and a spray arm disposed on the support member; and

6 and 7 associated lateral sectional views of the Sprüharmanordnung of 5 ,

With reference to the following figures, a Sprüharmanordnung from a holding element 100 and a rotatable on the holding element 100 mounted spray arm 200 described, which is characterized by a low bearing friction and a high resistance to dirt. The 1 and 2 show a schematic representation of a possible embodiment of these two components 100 . 200 , The others 3 to 7 illustrate another possible embodiment, wherein, except for minor, on the holding element 100 present deviations essentially the same structure exists. Therefore, in the following description, the 1 and 2 to the clarification of (matching) features partly on the in the 3 to 7 illustrated embodiment, reference is made.

1 shows a schematic side view of a Sprüharmanordnung, which in a washing container of a dishwasher 300 , in particular a household dishwasher 300 , can be used. The spray arm assembly includes a spray arm 200 with two spray arm legs extending in opposite directions 210 ("Duo spray arm") and one for holding the spray arm 200 provided retaining element 100 at which the spray arm 200 is rotatably mounted. The spray arm 200 points to this tick a centrally disposed, continuous recess, within which a substantial proportion of the holding element 100 is included (see also 5 ). The so-called "closure" designated retaining element 100 is on a base with a pedestal holding section 170 provided on which the spray arm 200 supported, and on which the spray arm 200 can slide along during a rotational movement. The holding element 100 and the spray arm 200 Both can be made of plastic.

For the rotatable mounting, the Sprüharmanordnung has two axially offset bearings 301 . 302 on, which in the following also as "upper" storage place 301 and "lower" depository 302 be designated. The upper depository 301 is through a storage section 120 of the holding element 100 and an associated, the storage section 120 enclosing abutment section 220 of the spray arm 200 educated. The lower depository 302 is through a storage section 150 of the holding element 100 and a storage section 150 enclosing abutment section 250 of the spray arm 200 educated. The sections 120 . 220 , and 150 . 250 are there, as in 2 based on the sections 120 . 220 becomes clear, (substantially) formed radially encircling, and give the about a rotational axis D executable rotational movement of the spray arm 200 on the holding element 100 in front. Further details about the bearing sections 120 . 150 . 220 . 250 will be described further below.

The holding element 100 includes, as in 1 shown, an (upper) substantially hollow cylindrical or tubular component, which via connecting webs 140 with another (or lower) component is connected (see also 3 and 4 ). The tubular component comprises a tubular attachment portion 110 , adjacent to this the storage section 120 , and adjoining this an intermediate section 130 , These three sections 110 . 120 . 130 which can be formed (radially) outwardly stepwise against each other projecting, enclose a common recess.

The attachment section 110 is used to hold the retaining element 100 as in 1 shown on an inlet pipe 310 the dishwasher 300 to fix. About the inlet pipe 310 can from a circulation pump of the dishwasher 300 funded rinsing liquid under pressure in the holding element 100 , and about the retaining element 100 continue into the spray arm 200 or its Sprüharmschenkel 210 be initiated, as indicated by arrows. For fastening the retaining element 100 at the inlet pipe 310 For example, an embodiment in the form of a bayonet closure may be provided. For this purpose, the attachment section 110 of the holding element 100 with outside locking elements 111 be provided, which in corresponding recesses on the inlet pipe 310 can intervene (cf. 3 and 4 ).

The inlet pipe 310 may, for example, at a bottom of one in the washing of the dishwasher 300 slidably mounted (upper) dish rack be arranged (not shown). In this regard, it may be at the in 1 shown arrangement around an upper Sprüharmanordnung the dishwasher 300 act. The dishwasher 300 may also include a lower Sprüharmanordnung, which will not be discussed in more detail.

The intermediate section 130 , which may be in the form of a circular ring plate is as in 1 represented by the connecting webs 140 with the further or lower part of the holding element 100 connected, which the storage section 150 , the pedestal holding section 170 and an intermediate, further cylindrical, intermediate section 160 includes (see also 3 and 4 ). Above the storage section 150 or connected to this is in the interior of the retaining element 100 a cone-shaped elevation 145 , in the following also as Leitkonus 145 designated, provided (see also 5 ). The Leitkonus 145 serves to hold in the retaining element 100 over from the sections 110 . 120 . 130 enclosed recess in the axial direction in the holding element 100 inflowing rinsing fluid in the radial direction to redirect or deflect, so that the rinsing fluid through openings between the connecting webs 140 in the spray arm 200 or its Sprüharmschenkel 210 can flow in, as in 1 is illustrated by the arrows.

The spray arm legs extending in opposite directions 210 of the spray arm 200 which in the 1 and 2 are shown only in part, are provided with (not shown) cleaning nozzles, which emit corresponding sprays on supply of pressurized rinse water. Here, the nozzles on an upper side of the legs 210 be arranged to be able to moisten ware, which is arranged in the (above present) dish rack, with rinsing liquid. The nozzles are further aligned such that a rotational movement of the spray arm occurs as a result of the recoil occurring when flushing fluid flows out 200 is caused. In this case, the spray arm 200 on the holding section 170 of the holding element 100 along and over the upper and lower depository 301 . 302 guided radially.

When adding flushing fluid to the spray arm 200 also becomes a (minor) part of the flushing fluid through the bearings 301 . 302 or in pressed in this area, relatively small column, as also in 1 indicated by arrows. In this way, lubrication of the bearings 301 . 302 be achieved. This also applies to the area in which the spray arm 200 on the holding section 170 of the holding element 100 slides during the rotational movement. However, the associated leakage can be neglected due to the small gap or gaps.

The spray arm 200 As shown by the supervisory presentation of 2 becomes clear, in a central area between the two Sprüharmschenkeln 210 one opposite the Sprüharmschenkeln 210 widening, oval-shaped section, which is hereinafter also referred to as "base section". In this area, the through recess is provided, in which the holding element 100 (or a substantial proportion of the same) is included. The recess provided in the central base portion is upper side as in FIG 1 shown with a border 225 which, in the assembled state of the Sprüharmanordnung an end portion of the inlet pipe 310 opposite. The border 225 may optionally be formed from two substantially semicircular wall sections which pass through two small gaps 226 are separated from each other (see 5 indicated gap 226 ).

Adjacent to the border 225 points the spray arm 200 in an upper portion of the base portion on a radially circumferential wall portion, which at the upper bearing point 301 an inwardly directed, protruding abutment portion 220 forms or is connected to this (see. 1 and 5 ). In a lower portion of the base portion, the spray arm 200 a radially circumferential support portion 255 on, with the help of the spray arm 200 on the holding section 170 of the holding element 100 is supported, and over which the spray arm 200 during the rotational movement on the holding section 170 can slide. The support section 255 goes over into one or is connected to a circumferential, as an abutment section 250 serving wall portion of the spray arm 200 , which is in the area of the lower depository 302 is provided.

With regard to the abutment sections 220 . 250 of the spray arm 200 can be provided, the two abutment sections 220 . 250 over two, between the spray arm legs 210 to connect arranged inner partitions. At the in 5 shown embodiment, this is in the form of two partitions 230 illustrated. By such a configuration, the spray arm 200 be given a higher stability. Furthermore, the intermediate walls 230 Make sure that of the retaining element 100 coming or in the direction of the side walls 230 redirected flushing fluid directly to the Sprüharmschenkeln 210 is diverted. Outside of the partition walls 230 due to the oval shape of the base portion of the spray arm 200 , further wall sections before (see. 5 ).

In the Sprüharmanordnung the upper bearing point 301 , as in 1 shown by the outer or outward, circumferential bearing portion 120 of the holding element 100 , and the inner or inward, circumferential abutment portion 220 of the spray arm 200 educated. The abutment section 220 is in the form of an inwardly protruding elevation, whose inwardly directed, radially encircling and continuous side surface serves for abutment or radial guidance. The corresponding bearing section 120 of the holding element 100 includes one of recessed slots 122 interrupted, radial guide surface, whereby a structure with the guide surface "supporting" and serving for guidance, curved runs surveys 121 and recesses 122 is present (see also 3 and 4 ).

The recesses 122 serve as "free spaces", whereby the bearing gap is increased at these locations and dirt particles, which together with the rinsing liquid in or through the upper bearing 301 be pressed, can be washed away to the outside. In this way, accumulation of dirt, and associated adverse effects such as increased bearing friction and blocking of the spray arm movement, can be prevented. Such a risk can especially at the upper bearing 301 exist, by which compared to the lower depository 302 usually more rinse liquid is pushed through.

Conventionally provided for discharging dirt at a bearing point provided grooves or recesses are formed with a rectangular shape. However, this can result in heavy dirt entry result in that the dirt is not reliably flushed due to the parallel groove design, since each has the same cross-sectional area at the inlet and outlet of a recess.

To avoid this problem, the recesses are 122 at the storage section 120 provided with a widening in the exit direction of the rinsing liquid form. Here are opposite side walls or side surfaces of the recesses 122 , as in 1 shown inclined to each other, whereby the recesses 122 have a V-shaped contour.

The V-shape ("double bevel") of the recesses 122 As a result, the Cross-sectional area of the recesses 122 enlarged in the exit direction. To illustrate the increasing cross section are in the supervisory view of 2 one at the entrance of a recess 122 present cross-sectional width A, and one at the exit of the recess 122 present and the cross-sectional width A exceeding cross-sectional width B indicated. Due to the present in the outlet direction cross-sectional enlargement of the dirt due to the "flushing water flow" through the bearing 301 relatively easily and reliably dissipated or flushed out, whereby a reduced bearing friction and increased soil compatibility can be effected. Also can jamming of the spray arm 200 be prevented with a high reliability. This is particularly advantageous if the spray arm 200 a relatively small spray arm and thus has lever arm length, which (only) a relatively small drive torque can be generated via the exiting from the cleaning nozzles rinse liquid.

The holding element 100 with the V-shaped recesses 122 may further be formed such that the cross section at the entrance of the recesses 122 the same as in rectangular (upper) recesses of a holding member of a conventional Sprüharmanordnung. Thus, the embodiment of the recesses shown here 122 with the widening or widening shape with the same hydraulic cross section of the associated bearing point 301 be realized. It follows from this that, in comparison to designs with the conventional rectangular shape, neither a pressure drop at the Sprüharmdüsen, nor an effect on the cleaning performance is caused.

As further in 1 is shown, lies in the upper bearing area 301 due to the inwardly projecting abutment portion 220 of the spray arm 200 and the over the storage section 120 or about the surveys 121 of the storage section 120 protruding intermediate section 130 of the holding element 100 a step-shaped column shape. The step shape results in a structure corresponding to a labyrinth seal, whereby a corresponding hydraulic resistance is achieved, and an outflow of flushing fluid through the bearing 301 (in addition) can be limited.

The lower depository 302 the Sprüharmanordnung, as in 1 shown by the outer or outward, circumferential bearing portion 150 of the holding element 100 , and the inner or inward, circumferential abutment portion 250 of the spray arm 200 educated. The abutment section 250 leading to the bottom of the spray arm 200 towards the support section 255 forms or with the support section 255 is connected, forms an inwardly directed, radially encircling, continuous and suitable for guiding side surface. The associated storage section 150 of the holding element 100 has a shape comparable to the upper bearing section 120 on. In this regard, the bearing section comprises 150 (again) one of recessed slots 152 interrupted radial guide surface, creating a structure with serving for guiding and curved surveys 151 and recesses 152 is present.

Similarly, the recesses allow 152 a flushing out of dirt particles, which together with the rinsing liquid into or through the lower bearing point 302 be pressed. In order to promote the removal of dirt, and consequently to achieve a reduced bearing friction and increased dirt compatibility, have the recesses 152 like the upper recesses 122 here too, as in 1 shown, a widening in the exit direction of the washing liquid form with obliquely extending side walls or a V-shape, which leads to a cross-sectional enlargement in the exit direction. Again, it may be provided that the cross section at the entrance of the recesses 152 the same is the case with rectangular (lower) recesses of a conventional holding element. For further details, reference is made to the above comments on the bearing section 120 or to the recesses 122 referred, which apply analogously here.

Based on the following 3 to 7 is a further embodiment of a Sprüharmanordnung for a dishwasher 300 with a holding element 100 and one on the holding element 100 rotatably arranged spray arm 200 described. The spray arm 200 is here constructed consistently in the manner described above. For the holding element 100 lies, except for differences in the area of the two bearing sections 120 . 150 , a structure comparable to that in the 1 and 2 shown holding element 100 in front. It should be understood that reference is made to the foregoing with respect to the details already described, which are directed to the same or identical features and aspects, operation, advantages, and the like. In the same way, there is the possibility that the following aspects can also be used in the spray arm arrangement described above.

The 3 and 4 show different perspective views of the holding element 100 the further Sprüharmanordnung. The holding element 100 again has the structure described above with the upper substantially hollow cylindrical Component on which via connecting webs 140 connected to the further or lower component. The tubular component comprises the tubular attachment portion 110 , the upper bearing section 120 , and the intermediate section 130 , The one with the intermediate section 130 over the connecting bridges 140 connected further holding element component comprises the lower bearing portion 150 , the intermediate section 160 and the socket-shaped holding section 170 , Above the storage section 150 has the retaining element 100 inside, as well as on the basis of 5 to 7 becomes clear, the Leitkonus 145 on.

Based on 3 and 4 becomes the embodiment of the attachment portion 110 with locking elements arranged on the outside 111 clear. The locking elements 111 can on appropriate locking receptacles of a supply pipe 310 the dishwasher 300 Be tuned, so that by inserting the attachment section 110 into the inlet pipe 310 (see. 1 ) and a subsequent twisting the holding element 100 detachable at the inlet pipe 310 can be fastened (bayonet lock).

To facilitate such assembly, the socket-shaped holding portion 170 of the holding element 100 furthermore, as in the 3 and 4 shown, with a manual screwing or twisting of the holding element 100 be provided suitable contour. The holding section 170 is also with an annular, flat tread 171 provided on which the associated spray arm 200 with the support section 255 can slide along (cf. 5 ).

As further in the 3 and 4 is shown, the upper bearing portion 120 of the holding element 100 (again) a structure with surveys 121 and recessed cutouts 122 on. The recesses 122 have mutually inclined side surfaces (V-shape) and thus an increasing in the exit direction cross-sectional area, whereby a discharge of dirt particles on the from the storage section 120 of the holding element 100 and the anvil section 220 of the spray arm 200 formed upper depository 301 (see. 6 and 7 ) is favored.

In addition, the storage section 120 additionally on two opposite sides each with a mold separation area 128 provided, of which in the 3 and 4 only one mold separation area 128 is shown. The two mold separation areas 128 which have a trapezoidal contour and in each case between two surveys provided for radial guidance 121 are arranged or laterally in surveys 121 go over, allow easy production of the retaining element 100 as a plastic component by means of injection molding. The mold separation areas 128 , in the area in the context of the production of the holding element 100 used tool shapes of an injection mold can adjoin each other, as in the 3 and 4 shown, each with a central edge 129 on. The edge 129 marks the course of a separation plane existing between the tool shapes. By the edge 129 becomes every mold separation area 128 in two sections with obliquely to each other or obliquely on the edge 129 tapered surfaces divided. The surfaces act here as Entformungsschrägen, creating a slight detachment of the retaining element 100 from the tool shapes used (demolding) is made possible.

In the area of the two mold separation areas 128 (also) to achieve a reliable flushing of dirt are the mold separation areas 128 including the edge 129 with a cross-section obliquely to the abutment portion 220 of the spray arm 200 or obliquely to the guide surface extending form provided, in particular on the basis of 6 and 7 becomes clear. As a result, there is also a bevel or oblique shape with respect to the axis of rotation D (cf. 7 ). Because of this contour lies in the area of the mold separation areas 128 , similar to the widening recesses 122 , A present in the exit direction cross-sectional enlargement of the bearing gap and thus a free space enlargement before. As a result, in these areas of the upper bearing point 301 a slight flushing of dirt particles can be achieved, whereby the risk of dirt accumulation can be avoided.

As further in the 3 and 4 is shown, the lower bearing portion 150 of the holding element 100 unlike in 1 shown embodiment not with V-shaped recesses 152 but with rectangular recesses 156 and intermediate, provided for radial guidance surveys 155 educated. This structure of the bearing section 150 is caused by the lower depository 302 , which from the storage section 150 of the holding element 100 and the associated abutment section 250 of the spray arm 200 is formed (cf. 6 and 7 ), usually less flushing fluid than through the upper bearing 301 is pushed through. The lower depository 302 is therefore less critical with regard to the introduction of dirt particles. In other words, in spite of the rectangular shape shown here, there is no danger of jamming of the spray arm, even with heavy dirt.

The lower bearing section 150 is additionally on two opposite sides each with a mold separation area 158 provided, of which in the 3 and 4 only one mold separation area 158 is shown. The two mold separation areas 158 which have a rectangular contour and in each case between two projections provided for radial guidance 155 are arranged or laterally in surveys 155 are also for Entformungstechnischen reasons to allow easy production of the retaining element 100 provided by plastic injection molding. A central edge 159 Here, too, marks the course of a separation plane existing between the tool shapes used. By the edge 159 becomes every mold separation area 158 divided into two sections with obliquely extending and serving as Entformungsschrägen surfaces. Due to the more uncritical behavior of the lower bearing described above 302 are the mold separation areas 158 not with an oblique to the abutment portion 250 running form, but run the mold separation areas 158 including the edges 159 in cross section (substantially) parallel to the abutment portion 250 or to its guide surface (see. 7 ).

Based on the perspective sectional view of 5 and the associated side sectional views of the 6 and 7 Be more details of the holding element 100 and the spray arm 200 formed Sprüharmanordnung clearly. In particular, in the area of the upper bearing 301 present, step-shaped column shape, which is due to the inwardly projecting abutment portion 220 of the spray arm 200 and the over the storage section 120 protruding intermediate section 130 of the holding element 100 , Also described above are details of the spray arm 200 , such as the presence of partitions 230 between the abutment sections 220 . 250 , and the presence of further wall sections on the outside of the partitions 230 , clear. As in 7 indicated, the spray arm 200 in this area also be composed of several interconnected components.

The embodiments explained with reference to the figures represent preferred or exemplary embodiments of the invention. In addition to the described and illustrated embodiments, further embodiments are conceivable which may include further modifications and / or combinations of described features. In particular, it is possible to have a spray arm arrangement comprising a holding element 100 and a rotatable on the holding element 100 mounted spray arm 200 to realize, in which the holding element 100 and / or the spray arm 200 have a different structure or a different shape than the embodiments shown in the figures.

With regard to in 1 As shown embodiment, it is possible, for example, the upper abutment portion 220 not in the form of an inward survey. The abutment section 220 this can be comparable to the lower counter bearing section 250 without "supernatant" pass into adjoining wall areas, wherein the portion of the bearing section 120 opposite side surface can serve for abutment or guide.

Other shapes and / or geometries are conceivable in particular for recessed and an expanding shape owning recesses of a bearing section. For example, it is possible instead of the recesses shown 122 . 152 to realize with the double slope or V-shape an expansion in the exit direction with curved side surfaces or side walls, wherein the side surfaces may, for example, in the exit direction concave or cup-shaped curved outward. This applies to both recesses 122 an upper bearing section 120 , as well as for recesses 152 a lower bearing section 150 ,

Regarding the in the 3 to 7 shown embodiment of the retaining element 100 one possible modification is the lower bearing section 150 instead of rectangular recesses 156 with widening or V-shaped recesses, for example with a too 1 comparable structure to train. Furthermore, it is also possible to have a mold separation area here 158 to provide, which comparable to the mold separation area 128 of the upper bearing section 120 is formed, and therefore an oblique to the abutment portion 250 extending form to achieve a cross-sectional enlargement of the bearing gap in the exit direction.

A further alternative is to form a bearing portion of a holding element with a continuous guide surface, and to provide recesses with a widening shape (in particular a V-shape) on an associated, the bearing portion of the holding member enclosing bearing portion of a spray arm.

Furthermore, the possibility is pointed out that a holding element constructed according to the above approaches 100 with widening recesses for retrofitting a dishwasher 300 can be used. Here, the holding element 100 replace a structurally identical retaining element, which has rectangular recesses, to allow a reduced bearing friction and increased dirt compatibility.

In addition, it should be noted that the approaches and concepts described above are not limited to domestic dishwashing machines, but may be applied to dishwashing or industrial dishwashers used in other fields.

LIST OF REFERENCE NUMBERS

100

 retaining element

110

 attachment section

111

 locking element

120

 bearing section

121

 survey

122

 recess

128

 Mold release area

129

 edge

130

 intermediate section

140

 connecting web

145

 guide cone

150

 bearing section

151

 survey

152

 recess

155

 survey

156

 recess

158

 Mold release area

159

 edge

160

 intermediate section

170

 holding section

171

 tread

200

 spray arm

210

 Sprüharmschenkel

220

 Against bearing section

225

 border

226

 gap

230

 partition

250

 Against bearing section

255

 support section

300

 dishwasher

301, 302

 depository

310

 supply pipe

A, B

 Section width

D

 axis of rotation

Claims (10)

Spray arm arrangement for a dishwasher ( 300 ), in particular household dishwasher ( 300 ), comprising a spray arm ( 200 ) and a holding element ( 100 ) for holding the spray arm ( 200 ), wherein the spray arm ( 200 ) rotatable on the holding element ( 100 ), wherein for rotatable mounting at least one bearing section ( 120 ) and at least one abutment section ( 220 ) are provided, and wherein the bearing section ( 120 ) Recesses ( 122 ), characterized in that the recesses ( 122 ) of the storage section ( 120 ) have a widening shape. Spray arm assembly according to claim 1, wherein the retaining element ( 100 ) the storage section ( 120 ) with the recesses ( 122 ) and the spray arm ( 200 ) the abutment section ( 220 ), and wherein the abutment portion ( 220 ) the storage section ( 120 ) encloses. Spray arm arrangement according to one of the preceding claims, wherein the recesses ( 122 ) of the storage section ( 120 ) have mutually inclined side walls. Spray arm arrangement according to one of the preceding claims, wherein the bearing section ( 120 ) a mold separation area ( 128 ), and wherein the mold separation region ( 128 ) an oblique to the abutment portion ( 220 ) has a running shape. Spray arm arrangement according to one of the preceding claims, wherein for the rotatable mounting of the spray arm ( 200 ) on the retaining element ( 100 ) another storage section ( 150 ) and another abutment section ( 250 ) are provided, and wherein the further storage section ( 150 ) Recesses ( 152 ; 156 ) having. Spray arm assembly according to claim 5, wherein the recesses ( 152 ) of the further storage section ( 150 ) have a widening shape, in particular obliquely extending side walls. Spray arm arrangement according to one of the preceding claims, wherein the retaining element ( 100 ) a holding section ( 170 ), on which the spray arm ( 200 ) is supported. Dishwasher ( 300 ), in particular household dishwasher ( 300 ), comprising a spray arm arrangement ( 100 ; 200 ) according to any one of the preceding claims. Dishwasher according to claim 8, wherein the holding element ( 100 ) on a feed pipe ( 310 ) of the dishwasher ( 300 ) is attached. Retaining element ( 100 ) for holding a spray arm ( 200 ) a dishwasher ( 300 ), wherein the retaining element ( 100 ) for rotatably supporting the spray arm ( 200 ) is formed and a recesses ( 122 ) bearing section ( 120 ), characterized in that the recesses ( 122 ) of the storage section ( 120 ) have a widening shape.

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