Storage spray arm arrangement, household dishwasher and process

Abstract

The invention relates to a bearing-spray arm arrangement (15) for a household dishwasher (1), comprising a spray arm (18) and a bearing (17) which rotatably supports the spray arm (18) about an axis of rotation (19), wherein a sliding plane (20) is formed between the bearing (17) and the spray arm (18), which is arranged perpendicular to the axis of rotation (19), wherein at least one groove (28, 28') is provided which extends tangentially (t) or radially (r) in the sliding plane (20).

Description

The present invention relates to a storage spray arm assembly, a household dishwasher and a method.Known household dishwashers generally comprise a washing chamber and a plurality of baskets on which dirty dishes can be arranged for cleaning. When the household dishwasher is in operation, a mixture of water and washing agent, also referred to as wash liquor, is sprayed onto the dirty tableware through nozzles, for example with the aid of a pump. The wash liquor thereby washes dirt particles from the dirty dishes, whereby the latter is cleaned. The dirt particles are taken up by the wash liquor and the wash liquor is pumped back to the nozzles by means of the pump after passing through a screen.It is known to use a rotatably mounted spray arm with a plurality of nozzles for distributing the wash liquor. The spray arm is mounted, for example, below one of the wash baskets on a feed line for wash liquor with the aid of a bearing and rotates during the operation of the household dishwashers. The torque which brings about the rotation of the spray arm arises as a result of the targeted emergence of the wash liquor from the nozzles. As a result, the washing liquor can be distributed uniformly in the washing chamber.The spray arm is rotatably mounted by means of a bearing. In this case, it may be a challenge to ensure this rotational movement reliably in the event of increased loading of the washing liquor with dirt particles.The document EP 2 556 781 B1 shows a spray arm arrangement for a dishwasher, in particular a household dishwasher. The spray arm assembly includes a spray arm and a retaining member for retaining the spray arm. The spray arm is rotatably mounted on the holding element. For rotatable mounting, at least one bearing section and at least one counter bearing section are provided. The bearing section has recesses. The spray arm arrangement is characterized in that the recesses of the bearing section have an expanding shape.Against this background, it is an object of the present invention to improve a mounting of a spray arm.Accordingly, according to a first aspect, a bearing-spray arm arrangement for a domestic dishwasher is proposed, having a spray arm and a bearing which rotatably supports the spray arm about an axis of rotation, wherein a sliding plane is formed between the bearing and the spray arm, which sliding plane is arranged perpendicular to the axis of rotation, wherein at least one groove is provided which extends tangentially or radially in the sliding plane.Advantageously, the groove is configured to form a channel through which washing liquid flows during operation of the household dishwasher in order to remove dirt particles located in the sliding plane from the latter. In particular, this changes a rotational resistance of the spray arm.The storage spray arm arrangement is configured in particular to uniformly distribute wash liquor by means of the spray arm in a wash chamber of the domestic dishwasher.The household dishwasher (also referred to below as dishwasher) can comprise a washing chamber. For example, dishes, in particular dishes to be cleaned, can be accommodated in the washing chamber. The tableware can be accommodated on one or more washware receptacles. For example, the storage spray arm arrangement can be mounted below and / or above the one or more washware receptacles. The bearing spray arm arrangement can be attached to an upper side and / or to a lower side of the flushing chamber. In particular, a plurality of bearing spray arm arrangements can be arranged in the flushing chamber.The spray arm may have two wings, wherein a receptacle may be arranged between the two wings. The receptacle can be configured to receive the bearing. For example, the spray arm has one or more outlet nozzles. Furthermore, the spray arm can have a cavity. For example, the cavity may be configured to direct the wash liquor to the one or more outlet nozzles within the spray arm. With the aid of the one or more outlet nozzles, the washing liquor can emerge from the cavity. In particular, the wash liquor exits into the wash chamber of the domestic dishwasher. For example, the one or more outlet nozzles can be arranged on the spray arm such that a torque is generated on the spray arm when the wash liquor exits. The spray arm can furthermore have an inlet opening. With the aid of the inlet opening, the washing liquor can be conducted into the cavity. The inlet opening can have a circular cross section. For example, the spray arm is produced with the aid of an injection molding process.For example, the bearing is connected on a first side to an inlet, in particular a pipe. For example, the feed can lead the wash liquor to the store. The store may direct the wash liquor to a second side. In particular, the inlet opening of the spray arm is attached to the second side.In particular, the axis of rotation is arranged at a center point of the inlet opening of the spray arm. For example, the bearing guides the wash liquor parallel or along the axis of rotation. In particular, the spray arm rotates relative to the bearing in the sliding plane.A groove which extends radially in the sliding plane is to be understood in the present case as meaning a longitudinal groove, especially a longitudinal groove. The central axis of the groove intersects the rotational axis. A groove which extends tangentially in the sliding plane is to be understood in the present case as meaning that a longitudinal groove, especially a longitudinal groove. The center axis of the groove is in contact with a circle around the axis of rotation and at a point in the plane of sliding. In particular, the groove can be formed exclusively radially or exclusively tangentially in the abovementioned manner. The grooves could also extend radially and tangentially in sections in other embodiments. The groove can extend exclusively linearly, in particular with a constant cross section.The groove is formed in particular as a recess. For example, the groove has a bottom side (bottom), a first and a second side wall, wherein the first and second side walls can be opposite each other. The groove may have a U-shaped cross section. In particular, the groove has an open side arranged opposite the underside. The open side may lie in the sliding plane. For example, the groove is formed with a polygonal cross section. In particular, the groove has a semicircular or semi-elliptical cross section.According to one embodiment, the bearing has a sliding surface on which a corresponding sliding surface of the spray arm is supported, wherein the at least one groove is formed in the sliding surface and / or in the corresponding sliding surface.Advantageously, because the at least one groove is arranged in the sliding surface and / or in the corresponding sliding surface, an amount of lubricant (washing liquor) between the sliding surface and the corresponding sliding surface can be increased, as a result of which a friction torque can be reduced compared to a bearing spray arm arrangement without the at least one groove.For example, the sliding surface and / or the corresponding sliding surface has a circular, in particular circular, cross section. In particular, the sliding surface and the corresponding sliding surface are arranged parallel to one another. The sliding surface and the corresponding sliding surface can be arranged perpendicular to the axis of rotation.According to a further embodiment, the bearing spray arm arrangement is characterized by a sliding disc which is arranged between a sliding surface of the bearing and a corresponding sliding surface of the spray arm, wherein the at least one groove is formed in the sliding surface, in the corresponding sliding surface or in the sliding disc.Advantageously, with the aid of a sliding disk, which in particular rotates freely, the probability of discharging dirt particles can be increased.For example, the sliding plane is formed between the sliding surface and the sliding disk and / or between the corresponding sliding surface and the sliding disk.According to a further embodiment, the bearing has an axial through-opening which is configured to introduce wash liquor into the spray arm, wherein the at least one groove is configured to guide wash liquor from the spray arm into a wash chamber of the domestic dishwasher.Advantageously, by receiving dirt particles and transporting them away from the bearing spray arm arrangement into the flushing chamber with the aid of the groove, a uniform rotational movement of the spray arm can be maintained. Spray arm bearing arrangements are also conceivable as a result, which have large tolerances between the sliding surface and the corresponding sliding surface.In particular, the through-opening of the bearing can fluidically connect the inlet and the cavity of the spray arm. The through-opening can be configured cylindrically. Furthermore, the through-opening can have a circular cross section. The through-opening can extend parallel to the axis of rotation. A central axis of the through hole may be arranged collinearly with the rotational axis. The washing liquor is conducted to the bearing with the aid of the through-opening, for example along the axis of rotation.For example, the cavity of the spray arm and the flushing chamber are fluidically connected by means of the groove. In particular, in comparison with the at least one nozzle, a small amount of washing liquor is conducted into the washing chamber with the aid of the groove.According to a further embodiment, the bearing has a flange which comprises the sliding surface, wherein the at least one groove penetrates an outer periphery of the flange at its one end.Advantageously, a first opening of the groove to the cavity in the spray arm can thereby be formed.For example, the flange is formed at one end of the bearing. The flange is arranged, for example, perpendicular to the axis of rotation. For example, the flange has a circular, in particular circular, cross section.According to a further embodiment, the bearing has a bearing journal connected to the flange, wherein the bearing journal has a further groove into which the groove opens at its other end.Advantageously, the removal of dirt particles from the sliding plane can be further improved with the aid of the further groove.For example, the bearing pin is designed as a cylinder with a circular, in particular circular, cross section. In particular, the bearing pin has an outer lateral surface and / or an inner lateral surface. For example, the through-opening is bounded by the inner lateral surface. The bearing pin can be connected at one end to the inlet. For example, the bearing journal has fastening means for connecting to the inlet. In particular, the fastening means can comprise a thread, one or more openings and / or one or more projections. The bearing journal and the flange can be formed in one piece. The bearing can be produced by means of an injection molding process.The further groove can be surrounded by the outer circumferential surface of the bearing journal. In particular, the groove and the further groove form a channel with an L-shaped cross section.According to a further embodiment, the further groove extends parallel to the axis of rotation and / or the further groove is formed as an annular groove coaxial to the axis of rotation.Advantageously, the discharge of the dirt particles can be further improved by means of the arrangement and configuration of the further groove.For example, the further groove can be formed as a blind hole bore.According to a further embodiment, the at least one groove extending in the sliding surface, the corresponding sliding surface or the sliding disc is at least partially closed at its circumference by the respective other sliding surface or the sliding disc.For example, the open side of the groove is at least partially closed by the respective other sliding surface. In particular, a channel with a cylindrical cross section can be formed by the partial closing. For example, the cylindrical cross section comprises a circumferential surface which is continuous in sections, wherein the circumferential surface comprises the underside, the first and second side walls and at least one section of the other sliding surface.According to a further embodiment, the spray arm engages around the flange of the bearing.The bearing pin can be surrounded by the inlet opening of the spray arm. Furthermore, the bearing pin can extend into the inlet opening.The sliding surface may be disposed on a first side of the flange. For example, the sliding surface is arranged at least in a section between an outer circumference of the flange and the outer circumferential surface of the bearing journal.The further sliding surface may be arranged on a first side of the spray arm.According to a further embodiment, the at least one groove, which extends tangentially, is tilted with respect to a radius onto the axis of rotation in such a way that an opening of the at least one groove points towards the direction of rotation of the spray arm during operation of the household dishwasher.Advantageously, during the rotational movement of the spray arm, the inflow of washing liquor can be improved, as a result of which dirt particles are rinsed out of the sliding plane with a higher probability.In particular, the opening of the at least one groove facing in the direction of rotation is the opening which penetrates the outer periphery of the bearing flange.In particular, the radius is arranged perpendicular to the axis of rotation. For example, the radius extends onto the axis of rotation along the radial extent of the at least one groove.In particular, the direction of rotation of the spray arm is carried out along a circumferential direction about the axis of rotation.According to a further embodiment, the at least one groove, which extends tangentially, has an angle of at least 30 degrees, preferably at least 60 degrees, with a radius on the axis of rotation.In one embodiment, the at least one groove, which extends tangentially, has an angle of between 30 degrees and 60 degrees with a radius toward the axis of rotation. The groove may have a central axis along which the groove extends lengthwise. The central axis may divide the groove into at least two symmetrical halves. For example, the central axis is at an angle to the radius. If the first and / or second side wall of the groove run parallel to the central axis, the angle between the first and / or second side wall and the radius is obtained. Furthermore, a further angle between 150 degrees and 120 degrees can result between the radius on the axis of rotation and the groove. In particular, the angle has 45 degrees, wherein the further angle has 135 degrees.According to a further embodiment, at least three, preferably at least or exactly four, grooves are provided.Advantageously, the discharge of dirt particles from the sliding plane can thus be increasedFor example, the at least three grooves or the at least or exactly four panels are uniformly spaced apart from one another along the circumferential direction.According to a further aspect, a household dishwasher with a storage spray arm arrangement according to the first aspect or an embodiment of the first aspect is proposed.According to a further aspect, a method for flushing dirt particles out of a sliding plane between a bearing and a spray arm in a household dishwasher is proposed. The spray arm is mounted on the bearing rotatably about an axis of rotation. The method comprises the steps of: a) rotating the spray arm about the axis of rotation, wherein the sliding plane is arranged perpendicular to the axis of rotation; and b) flushing at least one groove, which extends tangentially or radially in the sliding plane with respect to the axis of rotation, with flushing liquid in the tangential or radial direction during step a).The embodiments and features described for the proposed storage spray arm arrangement correspondingly apply to the proposed household dishwasher and to the proposed method.Further possible implementations of the invention also include combinations, not explicitly mentioned, of features or embodiments described above or below with respect to the exemplary embodiments. In this case, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the invention.Further advantageous embodiments and aspects of the invention are the subject matter of the dependent claims and of the exemplary embodiments of the invention described below. The invention is explained in more detail below on the basis of preferred embodiments with reference to the enclosed figures. FIG. 1 shows a schematic perspective view of an embodiment of a household dishwasher; FIG. 2 shows a first embodiment of a bearing spray arm arrangement arranged in the flushing chamber from FIG. 1 ; FIG. 3 shows a top view of an embodiment of a bearing; FIG. 4 shows a section of an embodiment of a spray arm in section from a bottom view; FIG. 5 shows a second embodiment of a bearing spray arm arrangement; FIG. 6 shows a third embodiment of a bearing-spray arm arrangement; FIG. 7 shows a fourth embodiment of a bearing spray arm assembly; and FIG. 8 shows steps of a method for flushing dirt particles out of a bearing spray arm arrangement.In the figures, identical or functionally identical elements have been provided with the same reference numerals, unless otherwise indicated.FIG. 1 shows a schematic perspective view of an embodiment of a household dishwasher 1. the household dishwasher 1 comprises a washing container 2 which can be closed by a door 3, in particular in a watertight manner. For this purpose, a sealing device can be provided between the door 3 and the wash container 2. The rinsing container 2 is preferably cuboidal. The wash container 2 can be arranged in a housing of the household dishwasher 1. The wash container 2 and the door 3 can form a wash chamber 4 for washing washware.The door 3 is shown in its open position in FIG. 1. By pivoting about a pivot axis 5 provided at a lower end of the door 3, the door 3 can be closed or opened. With the aid of the door 3, a charging opening 6 of the wash container 2 can be closed or opened. The wash container 2 has a base 7, a ceiling 8 arranged opposite the base 7, a rear wall 9 arranged opposite the closed door 3 and two side walls 10, 11 arranged opposite each other. The base 7, the ceiling 8, the rear wall 9 and the side walls 10, 11 can be manufactured from a stainless steel sheet, for example. Alternatively, for example, the base 7 can be manufactured from a plastic material.The household dishwasher 1 further comprises at least one washware receptacle 12 to 14. Preferably, a plurality of, for example three, washware receptacles 12 to 14 can be provided, wherein the washware receptacle 12 can be a lower washware receptacle or a lower basket, the washware receptacle 13 can be an upper washware receptacle or an upper basket, and the washware receptacle 14 can be a cutlery drawer. As FIG. 1 further shows, the washware receptacles 12 to 14 are arranged one above the other in the dishwasher cavity 2. Each washware receptacle 12 to 14 can be optionally moved into or out of the washware container 2. In particular, each washware receptacle 12 to 14 can be pushed or moved into the washware container 2 in an insertion direction E and can be pulled or moved out of the washware container 2 counter to the insertion direction E in a pull-out direction A.Furthermore, at least one bearing spray arm arrangement 15 shown in FIG. 2 is provided in the flushing chamber 4. The storage spray arm arrangement 15 is preferably attached to one of the washware receptacles 12 to 14 (in particular to the underside of the upper basket 14) and / or to the ceiling 8.The bearing spray arm arrangement 15 is attached, for example, to an end of an inlet 16, in particular connected in a positively locking manner to the end of the inlet 16. Furthermore, the bearing-spray arm arrangement 15 comprises a bearing 17 and a spray arm 18. the spray arm 18 is mounted rotatably about an axis of rotation 19 with the aid of the bearing 17 relative to the bearing 17. If the spray arm 18 rotates about the axis of rotation 19, the bearing 17 and the spray arm 18 form a common sliding plane 20. The bearing 17 and the spray arm 18 can be formed from plastic material or can each be manufactured by means of an injection molding process.The spray arm 18 may have nozzles 21. The nozzles 21 can be configured to distribute wash liquor 22 in the wash chamber 4 of the household dishwasher 1, wherein a flow direction of the wash liquor 22 is illustrated as arrows in FIG. 2. The washing liquor 22 is conducted, for example, with the aid of the inlet 16 to the storage spray arm arrangement 15. With the aid of a through-opening 23 (see FIG. 3 ) in the store 17, the washing liquor 22 can be conducted into a cavity 24 of the spray arm 18 and to the nozzles 21. The nozzles 21 are in particular oriented such that a repulsion force is produced when the washing liquor 22 is discharged into the washing chamber 4. The repulsive force may cause a torque acting on the spray arm 18 and generating a rotational movement 25 (see FIG. 3 ) of the spray arm 18 about the rotational axis 19. In addition, a smaller or smaller part of the washing liquor 22 can emerge from the cavity 24 into the washing chamber 4 through the sliding plane 20 at a connection point between the bearing 17 and the spray arm 18, in relation to the emergence from the nozzles 21.In Fig. 3 a top view of an embodiment of the bearing 17 is shown. The bearing 17 comprises a bearing journal 26 and a flange 27. Preferably, the axis of rotation 19 is arranged centrally in the hollow cylinder. The bearing pin 26 comprises the through-opening 23, which is bounded with the aid of an inner lateral surface of the hollow cylinder.The flange 27 can be designed as a cylinder with a first and second end face. Grooves 28 are formed on the first end face of the flange 27. For example, as shown in the embodiment of Fig. 3, four grooves 28 are disposed on the first end face of the flange 27. The spray arm 18 rests with a bottom side on the first end face of the flange 27 with the grooves 28, as shown in FIG. 4. The first end face of the flange 27 and the underside of the spray arm 18 abut each other when the bearing 17 and the spray arm 18 form the bearing-spray arm arrangement 15. In this case, a first sliding surface 29 of the bearing 17 and a second sliding surface 30 (see FIG. 4 ) of the spray arm 18 corresponding thereto form the sliding plane 20. For example, the first and second sliding surfaces 29, 30 are circular, in particular circular.Features of the grooves 28 are explained by way of example with reference to a groove 28. The groove 28 is formed as a recess in the first sliding surface 29. The groove 28 is formed such that the groove 28 has an open side toward the first sliding surface 29. If the bearing 17 and the spray arm 18 are formed to form the bearing-spray arm arrangement 15, the second sliding surface 30 covers the open side, as a result of which, for example, a channel comprising the open side, a bottom side and two mutually opposite wall sides is formed. With the aid of the channel, during operation of the household dishwasher 1, wash liquor 22 can flow into and through the sliding plane 20. Furthermore, the groove 28 comprises a longitudinal extension or central axis 31 The central axis 31 is arranged, for example, centrally within the groove 28 in a plan view of the groove 28.The groove 28 is arranged in FIG. 3 such that it has a tangential extension t. In this case, the central axis 31 of the groove 28 intersects the inner lateral surface, which is designed as a circle coaxial to the rotational axis 19, at exactly one point. The tangential extension t results in particular by tilting the groove 28 by an angle α with respect to a radius R. In particular, the angle α between the radius R and the central axis 31 can be measured. The angle α has in particular values between 30 and 60 degrees. Preferably, the angle α has a value of 45 degrees.In FIG. 3, a groove 28' is also shown in dashed lines. The groove 28' has, for example, a radial extension r, wherein a central axis 31' of the groove 28' intersects the rotational axis 19.In a further embodiment, which is not shown in FIG. 3, the groove 28, 28' can have a radial and tangential extension r, t, wherein a central axis 31, 31' of the groove 28, 28' is arranged parallel to the radial and tangential extension r and t, respectively.Furthermore, the groove 28 comprises an opening 32. the opening 32 is arranged such that it penetrates an outer periphery U of the first sliding surface 29 or of the flange 27. In addition, the opening 32 points in the direction of the rotational movement 25 of the spray arm 18 during operation of the household dishwasher 1.FIG. 4 shows a section of an embodiment of the spray arm 18 in a section from below. The spray arm 18 comprises, for example, the second sliding surface 30 on the underside.Furthermore, the spray arm 18 can have an inlet opening 33. The inlet opening 33 has, for example, a circular cross section. For example, the axis of rotation 19 is arranged centrally in the inlet opening 33. If the spray arm 18 and the bearing 17 are formed to form the bearing-spray arm arrangement 15, the spray arm 18 engages around the flange 27 of the bearing 17. the flange 27 is then arranged in particular in the cavity 24, as a result of which, for example, a form-fit connection is formed between the bearing 17 and the spray arm 18.FIGS. 5, 6 and 7 show a second, third and fourth embodiment of the bearing spray arm arrangement 15 from FIG. 2 ; the differences between the embodiments compared to the embodiment from FIG. 2 are discussed below.Referring now to Fig. 5, the second embodiment of the bearing spray arm assembly 15 is shown. For example, a slide disc 34 is disposed between the bearing 17 and the spray arm 18. During operation of the household dishwasher 1, sliding can take place between the sliding disc 34 and the first and / or between the sliding disc 34 and the second sliding surface 29, 30 (see FIGS. 3 and 4 ) during the rotational movement 25 of the spray arm 18. For example, the sliding plane 20 can then form between the sliding disc 34 and the first sliding surface 29 and / or between the sliding disc 34 and the second sliding surface 30. Further, the grooves 28 (see FIG. 3 ) may be disposed in the sliding disc 34. Advantageously, a frictional moment between the bearing 17 and the spray arm 18 can be better adjusted with the aid of the sliding disk 34. The freely rotating sliding disk 34 can further increase a probability of discharging dirt particles from the sliding plane 20.Referring now to Fig. 6, there is shown the third embodiment of the bearing spray arm assembly 15. On the bearing journal 26 of the bearing 17, for example, an annular groove 35 is formed. The annular groove 35 can be formed in an outer circumferential surface of the bearing journal 26. Furthermore, the annular groove 35 can be connected to the groove 28, in particular fluidically, so that the washing liquor 22 can be conducted from the cavity 24 into the washing chamber 4 with the aid of the groove 28 and the annular groove 35. The annular groove 35 runs in the outer circumferential surface of the bearing journal 26 along a circumference.FIG. 7 shows the fourth embodiment of the bearing-spray arm arrangement 15. The further groove 36 is arranged, for example, in the outer circumferential surface of the bearing journal 26. The groove 28 and the further groove 36 can form a fluidic connection between the cavity 26 and the flushing chamber 4. With the aid of the groove 28 and the further groove 36, the washing liquor 22 can be conducted from the cavity 24 into the washing chamber 4. The further groove 36 extends, for example, along the axis of rotation 19.FIG. 8 shows steps of a method for flushing dirt particles out of the sliding plane 20.As a result of the guiding of wash liquor 22 through the nozzle 21 during the operation of the household dishwasher 1, the spray arm 18 rotates about the axis of rotation 19 in a first step S 1.If the washing liquor 22 is conducted into the washing chamber 4 with the aid of the nozzle 21, it is possible, for example, to clean dishes soiled with dirt particles, which are arranged on one of the washware receptacles 12 to 14. The washing liquor 22 can absorb the dirt particles. By means of a pump of the household dishwasher 1, the wash liquor 22 with the dirt particles can be conducted via the inlet 16 into the cavity 24. If the dirt particles are deposited in the sliding plane 20, the dirt particles can generate a frictional moment and thus prevent or make difficult a rotation of the spray arm 18.With the aid of the washing liquor 22, in a second step S 2, in the tangential or radial direction t, r, while the spray arm 18 rotates in the first step S 1, the at least one groove 28 which extends tangentially t or radially r in the sliding plane 20 with respect to the axis of rotation 19 is rinsed through.As a result, for example, dirt particles can be rinsed out of the sliding plane 20 into the rinsing chamber 4 with the aid of the groove 28, as a result of which, for example, the frictional moment caused by the dirt particles is dissipated again and a constant rotation of the spray arm 18 can take place.Although the present invention has been described on the basis of exemplary embodiments, it can be modified in various ways.Reference numerals used:1 Household dishwasher 2 Washing container 3 Door 4 Washing chamber 5 Pivot axis 6 Charging opening 7 Floor 8 Ceiling 9 Rear wall 10 Side wall 11 Side wall 12-14 Washware receptacle 15 Bearing spray arm arrangement 16 Inlet 17 Bearing 18 Spray arm 19 Axis of rotation 20 Sliding plane 21 Nozzle 22 Washing liquor 23 Passage opening 24 Cavity 25 Rotational movement 26 Bearing journals 27 Flange 28, 28' Groove 29 First sliding surface 30 Second sliding surface 31, 31' Central axis 32 Opening 33 Inlet opening 34 Sliding disc 35 Annular groove 36 Further groove A Extraction direction E Insertion direction r Radial direction R Radius S 1 Rotation of the spray arm about the axis of rotation S 2 Washing through at least one groove with washing liquor t Tangential direction U Circumference α Angle

Claims

Bearing spray arm arrangement (15) for a domestic dishwasher (1), having a spray arm (18) and a bearing (17) which rotatably supports the spray arm (18) about an axis of rotation (19), wherein a sliding plane (20) is formed between the bearing (17) and the spray arm (18), which plane is arranged perpendicular to the axis of rotation (19), wherein at least one groove (28, 28') is provided, which extends tangentially (t) or radially (r) in the sliding plane (20).Bearing-spray arm arrangement (15) according to Claim 1, characterized in that the bearing (17) has a sliding surface (29) on which a corresponding sliding surface (30) of the spray arm (18) is supported, wherein the at least one groove (28, 28') is formed in the sliding surface (29) and / or in the corresponding sliding surface (30).Bearing-spray arm arrangement (15) according to Claim 1, characterized bya sliding disc (34) which is arranged between a sliding surface (29) of the bearing (17) and a corresponding sliding surface (30) of the spray arm (18), wherein the at least one groove (28, 28') is formed in the sliding surface (29), in the corresponding sliding surface (30) or in the sliding disc (34).Bearing-spray arm arrangement (15) according to one of Claims 1 to 3, characterized in that the bearing (17) has an axial through-opening (23) which is configured to introduce wash liquor (22) into the spray arm (18), and the at least one groove (28, 28') is configured to conduct wash liquor (22) from the spray arm (18) into a wash chamber (4) of the domestic dishwasher (1).Bearing spray arm arrangement (15) according to one of Claims 2 to 4, characterized in that the bearing (17) has a flange (27) which comprises the sliding surface (29), the at least one groove (28, 28') at its one end breaking through an outer periphery (U) of the flange (27).Bearing-spray arm arrangement (15) according to Claim 5, characterized in that the bearing (17) has a bearing journal (26) connected to the flange (27), the bearing journal (26) having a further groove (35, 36) into which the groove (28, 28') opens at its other end.Bearing spray arm arrangement (15) according to Claim 6, characterized in that the further groove (36) extends parallel to the axis of rotation (19) and / or the further groove (36) is designed as an annular groove coaxial to the axis of rotation (19).Bearing spray arm arrangement (15) according to one of Claims 2 to 7, characterized in that the at least one groove (28, 28') which extends in the sliding surface (29), the corresponding sliding surface (30) or the sliding disc (34) is at least partially closed at its circumference by the respective other sliding surface (29, 30) or the sliding disc (34).Bearing-spray arm arrangement (15) according to one of Claims 5 to 8, characterized in that the spray arm (18) engages around the flange (27) of the bearing (17).Bearing spray arm arrangement (15) according to one of Claims 1 to 9, characterized in that the at least one groove (28, 28') which extends tangentially (t) is tilted with respect to a radius (R) on the axis of rotation (19) in such a way that an opening (32) of the at least one groove (28, 28') points towards the direction of rotation (25) of the spray arm (18) during operation of the domestic dishwasher (1).Bearing spray arm arrangement (15) according to Claim 10, characterized in that the at least one groove (28, 28') which extends tangentially (t) has an angle (a) of at least 30 degrees, preferably at least 60 degrees, with the radius (R) on the axis of rotation (19).Bearing spray arm arrangement (15) according to one of Claims 1 - 11, characterized in that at least three, preferably at least or exactly four, grooves (28, 28') are provided.Household dishwasher (1) with a storage spray arm arrangement (15) according to one of claims 1 - 12.Method for flushing dirt particles out of a sliding plane (20) between a bearing (17) and a spray arm (18) in a household dishwasher (1), wherein the spray arm (18) is mounted on the bearing (17) such that it can rotate about an axis of rotation (19), comprising the steps of: a) rotating (S1) the spray arm (18) about the axis of rotation (19), wherein the sliding plane (20) is arranged perpendicular to the axis of rotation (19); and b) flushing (S2) at least one groove (28, 28'), which extends tangentially (t) or radially (r) in the sliding plane (20) with flushing liquid (22) in the tangential or radial direction (t, r) during step a).

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