DE102017110046A1 - Sieve device for a dishwasher and dishwasher - Google Patents

Abstract

A dishwashing machine for inserting between a washing room and a tank for collecting dirty dishwashing water of the dishwasher, comprising at least one sieve configured to pass washing water to be cleaned from the washing room into the tank through the sieve, and at least one Sieve carrying screen frame, wherein it is provided that the sieve device has an opening for discharging foam from the tank into the washing compartment and comprises a cover which is movably mounted on the screen frame between a closed position in which the cover covers the opening, and a Opening position in which the cover at least partially releases the opening.

Description

The invention relates to a screening device for a dishwasher and a dishwasher with a screening device. The dishwasher may in particular be a so-called transport dishwasher or a so-called program-controlled dishwasher.

A program-controlled dishwasher is to be understood as meaning a dishwasher which comprises a washing compartment in which the items to be washed are arranged, while individual washing operations and optionally drying operations take place within the washing compartment, and wherein the items to be washed substantially during the washing operation and optionally during the drying process located at a fixed location within the washing compartment. In the case of program-controlled dishwashers, there is no targeted movement of the items to be washed during a rinsing operation or optionally a drying operation between different positions within a rinsing room, for example specific zones or within a plurality of rinsing rooms.

In contrast, so-called transport dishwashers differ in that the items to be washed, for example, in a washing basket, is transported through different stations, wherein at different stations different processes, in particular rinsing and / or drying operations are performed. A transport dishwasher, in particular a commercial dishwasher, for example, may have a conveying path which extends transversely through the transport dishwasher from an input to an output, wherein between the input and the output one behind the other different zones, such as a Vorspülzone, a Hauptpülzone, a Nachspülzone and / or possibly one or more drying zones.

Many dishwashers have a tank for collecting the dirty rinse water. In such dishwashers, the rinsing medium, that is to say the rinsing liquid, is preferably introduced via nozzles into a washing compartment of the dishwasher for cleaning the dishes, it being possible for different nozzles to be present for a rinsing operation, a pre-rinsing operation and / or a rinsing operation.

The dirty rinse water is collected in the tank and at least partially cleaned by means of one or more cleaning or filtering devices, wherein a portion of the purified rinse water is sucked by a rinsing pump, so that it can be used again for a rinsing process, while another part of the im Tank is disposed of collected flushing medium.

Such a dishwasher is for example in DE 10 2011 008 491 A1 described. In it is the tank for collecting dirty rinse water below the sink. The tank is separated from the washing compartment by a flat screen, which serves to retain small dishes and coarse dirt particles. This surface sieve may be surrounded by a surface sheet which covers a part of the top of the tank and ensures that all rinse water from the rinsing room passes exclusively through the first sieve in the region of the tank.

As a result of the rinsing process, foaming occurs in the tank of a dishwasher. The foam is lighter than the dirty rinse water in the tank and therefore floats on top of it. If it comes to high foaming, so much foam can form inside the tank that this pushes from below against the flat screen and exerts a buoyant force on the flat screen. If the flat screen is held vertically in the dishwasher, such as by screwing, jamming or a relatively high weight, this may cause the foam to displace the soiled rinse water in the tank, causing the tank to idle, resulting in mechanical flushing power losses even failures of machine components, such as the Spülwasserheizung lead. If the force of the floating on the rinse water foam is sufficiently high to lift the surface sieve, this can be moved from its working position through the foam, so that form large openings through which not only rinse water, but also coarse dirt particles or fine cutlery from the Flushing room can fall into the tank, which machine components, such as the detergent pump, can pollute or even damage.

To reduce the foaming in the tank of a dishwasher, it is off DE 197 50 266 A1 It is known to abruptly reduce the speed of a circulating pump of a dishwasher and then to raise it again to a higher speed. The required control method is quite expensive and has a detrimental effect on the life of the circulation pump. Also, the rinsing result may be impaired.

On the basis of such a state of the art, it is an object of the present invention to provide a dishwasher and a sieve device which overcomes the disadvantages of the prior art, in particular avoids high-quality dishwashing result due to foaming in the tank of the dishwasher Impairment of the machine components of the dishwasher occur.

This object is achieved by the screening device according to claim 1 and by the dishwasher according to claim 9. The claims 2 to 8 relate to particularly advantageous embodiments of the screening device according to claim 1 and the claims 10 to 13 relate to particularly advantageous embodiments of the dishwasher according to claim 9.

The present invention relates to a screening device for a dishwasher, in particular a commercial dishwasher, such as a transport dishwasher or a program-controlled dishwasher. The screening device according to the invention is provided and configured for insertion between a washing compartment and a tank for collecting and discharging soiled dishwashing water of the dishwasher. The sieve device according to the invention comprises at least one sieve which is designed such that rinsing water is conducted from the rinsing space into the tank through the sieve, and a sieve frame carrying this at least one sieve. Preferably, the at least one screen and the screen frame are realized in one piece. The screen frame and the at least one screen may be separate components.

According to the invention, the sieve device has an opening for discharging foam from the tank into the washing compartment and a cover which is movably mounted on the sieve frame between a closed position in which the cover closes the opening and an opening position in which the Cover the opening at least partially releases. If foaming forms inside the tank in a dishwasher equipped with the screening device according to the invention, this foam can escape or flow out through the opening of the screening device into the washing compartment of the dishwasher after filling the free tank volume above the washing liquid. In the washing compartment, the foam is smashed, for example, by the rinse water released by the rinsing nozzles. The cover prevents coarse dirt particles or fine cutlery from entering the tank through the opening. The opening or openings are preferably greater than, in particular at least 3 times, at least 5 times or at least 10 times as large as, the coarsest mesh size of the sieve or sieves of the sieve device. An impairment of the dishwasher components as a result of large volumes of foam is consequently prevented by the invention without impairing the rinsing result.

The fact that the tank is arranged "below" the washing compartment means that the tank is arranged in the gravity direction below the washing compartment, so that flushing water automatically runs into the tank due to gravity. The tank itself can have in the horizontal direction quite dimensions that extend beyond the corresponding horizontal dimensions of the washing itself, the tank can be arranged, for example, in the horizontal direction completely adjacent to the washing compartment. In another embodiment, however, it is also possible that the tank itself is in fact not arranged in the gravitational direction below the washing compartment, in which case an additional pump is provided which conveys the washing water from the washing compartment into the tank. In general, in the context of this disclosure, spatial terms such as horizontal or vertical may refer to the direction of gravity.

The term "sieve" includes both sieves in the narrower sense, ie devices for separating solids according to different sizes, in particular grain sizes, as well as filter devices for separating solids from liquid and combinations thereof. A "sieve" may comprise different shapes and configurations, in particular it may be a substantially flat device, flat or curved, with openings, wherein the sieves are made of different materials, in particular metal, plastic and / or rubber of different hardnesses.

Another possibility for a "sieve" is a substantially 3-dimensional device, for example in the form of a labyrinth, which also ensures that elements of a certain size can not pass through such a 3-dimensional structure, for example a labyrinth. Again, both a screening and a filtration in the strict sense is realized.

In this sense, the term "mesh size" is to be understood to a broad extent: is it in the "sieve" in the context of this invention, for example, a conventional, area trained element, such as a mesh, which is typically referred to as a screen covering or surface sieve , This mesh size corresponds to the size of the openings. In the case of differently designed sieves in the sense of this invention, for example the above-mentioned labyrinth, the term "mesh size" is to be understood as the maximum size of solid body elements which are still passed through the sieve.

In one embodiment, the screening device comprises at least a first screen, which can be designed as a flat screen, as a screen quiver and / or screen cassette. Preferably, the sieve quiver exists from a sieve element similar to a wire mesh, preferably with a mesh size of 5 to 20 mm, preferably 10 to 15 mm, and a wire diameter of 0.5 to 3 mm, preferably 1 to 2 mm. In one embodiment, a wire mesh of the order of 12.5 - 1.5 (mesh size 12.5 mm and wire diameter 1.5 mm) is used.

The screening device may preferably have a second sieve which is designed as a fine sieve, preferably with a sieve element similar to a wire mesh, which preferably has a mesh width of 0.1 mm to 2 mm, particularly preferably of 0.2 mm to 1 mm or of 0, 3 mm to 0.7 mm, wherein the wire mesh preferably has a wire diameter in the order of 0.1 mm to 0.5 mm, preferably from 0.1 mm to 0.3 mm. In one embodiment, a fine screen of the order of 0.5-0.2 (0.5 mm mesh, 0.2 mm wire diameter) is used.

In a preferred embodiment, the cover is movable perpendicular to a plane defined by the screen frame surface. It should be understood that when the screen frame is mounted in a dishwasher, the area spanned by the screen frame extends horizontally between the washing compartment and the tank of the dishwasher in order to divide the interior of the dishwasher, on the one hand, into the washing compartment and, on the other hand, into the tank. The screen frame extends substantially horizontally. From the ideal horizontal extent, the screen frame may in particular deviate in such a way that the screen frame as a whole has a slight inclination relative to the ideal horizontal plane and / or at least one channel in order to facilitate the outflow of rinsing water from the surface of the screening device in the direction of the tank. The vertical mobility of the cover can be well activated by the floating foam, the foam can thus simply move the cover from the closed position in the direction of the open position. The cover, which preferably extends horizontally horizontally across the entire opening and this can cover at least the closed position completely, preferably also during a movement vertically, in particular upwards, from the opening hinfort in the direction of the open position, further shielding the opening with respect to vertically falling down Dishes, coarse dirt particles, etc. causes. Preferably, in an opening position located vertically above the closed position, the cover can effect at least partial, preferably complete, shielding of the opening, in particular against falling crockery or cutlery and / or coarse dirt particles which can not pass through the coarsest and / or outermost sieve of the screening device.

According to a particularly preferred embodiment, the cover is rotatable about a pivot axis S. The pivot axis S preferably extends in a horizontal direction. To open the cover, the cover can rotate about the pivot axis to move vertically upwards. The cover is preferably fixed to the pivoting axis on the screening device, preferably the screen frame. By the cover between the closed position and the open position is designed to be pivotable, the increase of the cover by the foam can be done weight-weight relieving and a floating away of the cover is prevented by a determination on the pivot axis. Preferably, the cover is rotatable by less than 90 °, in particular less than 45 °, preferably less than 30 °, more preferably less than 15 ° relative to the closed position. For this purpose, the screening device may have an end stop. The limitation of the mobility of the cover ensures that the outlet of the foam from the tank into the washing compartment, a sufficient horizontal passage area is available without releasing an equally large passage opening in the vertical direction for falling cutlery or coarse dirt particles.

In a preferred embodiment, the cover is in the closed position on the screen frame. Alternatively or additionally, the cover may extend in the closed position above the opening, wherein preferably at least the cover, at least in the closed position, preferably completely or at least partially shields the opening. In the closed position, the cover extends in a horizontal plane, preferably completely, in particular at least partially, for example at least 75%, at least 80% or at least 90%, vertically above and flat above the opening of the screening device. The area of the cover is preferably at least as large as the area of the opening; In particular, the cover may have a 10% to 50%, preferably 15% to 25% larger area than the area of the opening. It is also conceivable that a screening device has a plurality of openings, which are separated for example by webs of the screening device, wherein a single cover can extend above a plurality of openings. If a cover expands over a plurality of openings, the above ratios may be related to the summed area of the openings.

According to a particularly preferred embodiment, the cover is movable from the closed position to the open position up to an end stop of at most 5 cm, at most 2 cm or at most 1 cm. By providing an end stop, it is easy to ensure the cover does not move further than necessary away from the closed position providing a sufficient passage area for the foam.

According to a preferred embodiment, the cover is rectangular. According to a preferred embodiment, the cover is at least partially screen-like. The cover can be realized in particular as a flat screen. The movable cover part of the sieve device can realize a preferably further sieve of the sieve device, so that the entire area of the sieve device realized as a sieve is not or at most slightly impaired compared to conventional sieve devices despite the provision of a movable cover. Accordingly, the cover can pass rinsing liquid from the washing compartment into the tank in its sieve-like area and, when a large amount of foam appears, can be moved into an open position in which the cover liberates foam from the tank into the washing compartment. A rectangular design of the cover simplifies the articulation of the cover on the screen frame and allows a movement in the vertical direction or pivoting direction to one of the marginal edges of the rectangle according to which due to the rectangular shape, the formation of unnecessarily large passage cross-sections in the vertical direction are advantageously avoided.

According to a preferred embodiment, the cover releases, in the open position between the cover and the screen frame, a passage area for foam extending transversely to a surface spanned by the screen frame, which is arranged closer to a peripheral edge of the screen frame. The location of the passage area near one of the peripheral edges of the screen frame causes the foam passage area to be located near the side wall portions of the dishwasher where experience has shown that less dirt particles and less falling crockery or cutlery is expected than in a central dishwasher area. Preferably, the passage area is formed in an area which is not more than 25 cm, not more than 15 cm, not more than 10 cm or not more than 5 cm away from the peripheral edge of the screen frame.

The invention also relates to a dishwasher, in particular an industrial dishwashing machine, such as a transport dishwasher or a program-controlled dishwasher, comprises a washing compartment for receiving the items to be washed, such as cutlery, crockery, glasses or the like, as well as a tank for collecting and optionally discharging soiled flushing water. The contaminated rinse water can be, for example, a mixture of water, alkali and in particular fine dirt particles.

Between the washing compartment and the tank, a screening device is used, which should be designed as described above. The screening device separates the flushing space from the tank such that the flushing water from the flushing space must flow into the tank through a strainer of the flushing device. The sieve device has a sieve frame for depositing and / or fixing in the interior of the dishwasher. The dishwasher of the dishwasher comprises an opening which may be closed or covered by a cover or released from the cover.

Preferably, the cover is adapted to be lifted from foam in the tank of the dishwasher, in particular depending on the vertical height of the foam, from the closed position. For this purpose, the cover is preferably dimensioned such that its weight is sufficiently low, in particular in relation to the weight of the surrounding screen frame, that a lifting force due to the amount of foam in the tank only raises the cover, but not the remaining screening device, thereby letting foam through the now released from the cover opening can escape from the tank into the washroom. It is conceivable that below the screening device, a float or the like is provided, which is associated with the cover, to facilitate the lifting of the cover by the foam.

According to a preferred embodiment of a dishwasher, the sieve frame is fixedly mounted relative to the washing compartment and / or the tank. For example, a step or one or more lugs may be provided in the interior of the dishwasher, on which the screen frame is fixed in place. The dishwasher may include at least one fastener such as screws, clamps, wedges, latches or the like to fix the screen frame in an operative position. In this way, it is ensured that even large amounts of foam does not move the entire screening device but only the cover.

According to a preferred embodiment, the cover is movable in the vertical direction, ie perpendicularly with respect to the dishwasher, wherein the cover is preferably rotatable about a pivot axis extending in the horizontal direction.

In a preferred embodiment, the cover releases in its open position a passage area or a passage cross section for foam, which at least for the most part a peripheral region of the washing compartment with a low distribution of dirt particles, in particular near an inner wall of the washing compartment, is arranged. Preferably, the distance from the passage section to a nearest inner wall of the washing compartment may be 25 cm or less, 15 cm or less, 10 cm or less, or preferably 5 cm or less.

According to this preferred embodiment, it is ensured that the expected amount of dirt particles hits a part of the screening device which is formed by a metal sheet or a sieve and prevents the passage of coarse dirt particles. Preferably, the passage surface may be arranged in the washing compartment so that the wire is at least partially shielded by guide rails for crockery baskets or the like in the vertical direction.

According to a preferred embodiment of a dishwasher, the cover in its open position releases a preferably vertically extending, preferably gap-shaped, passage surface for foam, so that foam can enter the wash compartment through the passage surface transversely to the vertical direction, preferably in the direction (ie directed towards) a relative to the passage surface obvious, in particular nearest, inner wall of the washing compartment. The inner wall of the washing compartment then serves to shield the passage area against the passage of coarse dirt particles and dishes.

In particular, it is also possible to provide a sieve device according to the invention for dishwashers of the prior art which are already on the market and which can be used instead of a conventional sieve device in the interior of the dishwasher.

• 1 zeigt eine schematische Querschnittsansicht einer Geschirrspülmaschine mit einer erfindungsgemäßen Siebvorrichtung;
• 2 zeigt eine erste Ausführung einer erfindungsgemäßen Siebvorrichtung;
• 3 zeigt eine zweite Ausführung einer erfindungsgemäßen Siebvorrichtung, ähnlich der Ausführung der 2;
• 4 zeigt eine dritte Ausführung einer erfindungsgemäßen Siebvorrichtung;
• 5 zeigt eine schematische Ansicht eines Innenraums einer Geschirrspülmaschine mit einer erfindungsgemäßen Siebvorrichtung gemäß 2 oder 3; und
• 6 zeigt eine schematische Querschnittsansicht einer Spülmaschine mit einer Siebvorrichtung gemäß 4.

These and other features and advantages of the present invention will become more apparent from the accompanying drawings, which illustrate preferred embodiments of the invention.

• 1 shows a schematic cross-sectional view of a dishwasher with a screening device according to the invention;
• 2 shows a first embodiment of a screening device according to the invention;
• 3 shows a second embodiment of a screening device according to the invention, similar to the embodiment of 2 ;
• 4 shows a third embodiment of a screening device according to the invention;
• 5 shows a schematic view of an interior of a dishwasher with a screening device according to the invention according to 2 or 3 ; and
• 6 shows a schematic cross-sectional view of a dishwasher with a screening device according to 4 ,

In the following figures, the same or similar components are designated by the same or similar reference numerals for ease of reading.

1 schematically shows a process flow diagram of a dishwasher, in particular a commercial dishwasher 1 that have a dishwasher 3 and a substantially below the washing compartment 3 lying tank 5 includes. In the dishwasher 3 are rinsing nozzles 51 . 53 shown schematically. The nozzles 51 . 53 are supplied via a water supply coming from a fresh water tank 55 and / or the tank 5 below the sink 3 can be fed. To promote pumps 55 . 57 intended. To warm the rinse water is on the fresh water tank 55 as well as in the tank 5 , which may also be referred to as a regeneration tank, a heating coil 62 . 61 intended.

The Tank 5 can be a drain pump 63 have, through the rinse water from the tank 5 to a process 65 can be dissipated.

In the schematic process flow diagram according to 1 is the screening device according to the invention 11 between the washing room 3 and the tank 5 schematically indicated as a flat screen. The screening device according to the invention 11 will be described in detail with reference to the following figures.

2 shows a plan view of a screening device according to the invention 11 according to a first embodiment. The sieve device 11 is composed of a circumferential screen frame 33 for storing the screening device on a holder of the dishwasher 1 , for example, by the two-sided grading of the washing compartment 3 , as in 1 represented, can be realized. On the sieve frame 33 can, as in 2 shown, a first, as an area sieve 15 designed sieve be provided. Such a flat screen 15 can be made of a wire mesh of the order of 12.5 - 1.5 (mesh size 12.5 mm, wire diameter 1.5 mm) for the retention of small items to be washed and coarse dirt particles.

The sieve device 11 according to 2 further comprises a second sieve formed as a sieve quiver 13 that in a circular opening of the first flat screen 15 can be used. The second sieve 13 can from the screen frame 33 For example, via a bridge, directly or by means of the first sieve 15 be held indirectly. Such Quiver sieve can be designed, for example, as a fine sieve cylinder with a sieve element similar to a wire mesh of the order of 0.5-0.2 (mesh size 0.5 mm, wire diameter 0.2 mm). Through the sieves 13 . 15 enters the rinsing water freed of at least coarse dirt particles in the collecting tank 5 , As described above, the rinse water from the tank 5 through the recirculation pump 57 over the nozzles 53 back in the dishwasher 3 and the therein to be cleaned items to be cleaned (dishes, cutlery, etc.) are promoted.

The screening device according to the invention 11 according to 2 includes a rectangular flap-like cover 31 that have at least one hinge 35 on the screen frame 33 is held and on the screen frame 33 rests. The inner surface of the washing compartment is opposite the tank below 5 completely with the sieve device 11 covered. The area of the screening device 11 sits to a small extent through the outer circumferential screen frame 33 , but mostly by the surface of the flat screen 15 and the cover next to it 31 , together. Optionally, the cover 31 at least partially sieve-like, for example designed as a coarse sieve or fine sieve.

If foam from below, out of the tank 5 , against the sieve device 11 presses, so only the foam lifts the cover 31 from a closed position. As below with regard to the 5 (and 6) further described, the cover may 31 in this way in a relative to the substantially purely horizontal extension of the screen frame 33 and the associated area sieve 15 be spent in a slightly raised inclination. Opposite the horizontal H, the cover 31 For example, be opened up to an opening angle α of about 5 ° to 10 °. In the 5 easily recognizable passage opening 23 between the cover 31 and the screen frame 33 It allows foam, near a side inner wall 44 of the washing room 3 from the tank 5 in the dishwasher 3 to escape.

The cover 31 the execution according to the 2 and 5 extends across most of the washroom 3 , In this way, a small opening angle a to a sufficiently large passage opening is sufficient 23 to provide foam, with the cover 31 at its most to the pivot axis S farthest end only a few millimeters to a few inches lifts. The pivotable length of the cover 31 starting from the pivot axis S can be as large as or greater than the width of the opening of the pivot axis S outgoing 21 in the screening device 11 be. When the swiveling length of the cover 31 is slightly longer than the distance from the pivot axis S to the opposite end of the opening 21 , can the cover 31 Even with a small pivoting, for example by the angle α, starting from the closed position, in the vertical direction V, the opening 21 cover completely, so that no dirt particles and no dishes in Vertilcalrichtung V from the dishwasher 3 in the tank 5 can fall.

The proximity of the passage cross-section 23 to the inner wall 44 of the washing room 3 further ensures that the passage cross section 23 in one area of the sink 3 is realized in which the expected amount of dirt particles is anyway very low, because little items to be washed so close to the edge 44 will be located. Optionally, even a rail or the like in the vertical direction V above the passage cross section 23 be arranged so that additional, additional shielding by the dishwasher 11 is provided, which prevents coarse dirt particles or fine cutlery vertically through the passage cross-section 23 in the tank 5 falls.

The cover 31 can also be realized as an impermeable cover, for example made of sheet metal, the rinsing liquid only to the first sieve 15 and the second sieve 13 the screening device 11 directs.

The second embodiment of a screening device according to the invention 11 according to 3 is the execution according to 2 very similar. In the longitudinal horizontal direction, the cover extends 31 according to 3 over more than half the width of the screening device 11 and essentially leaves a recess for a quiver sieve 13 (not shown) free. The construction for the quiver sieve can be from another flat sieve 15 be surrounded. The cover 31 can also be used as a flat screen 16 be realized.

A further preferred embodiment of a screening device according to the invention 11 is in perspective 4 and in a fitted state in 6 displayed. From the previous embodiments, this differs essentially in that the pivot axis S approximately centrally in the washing compartment 3 is arranged, the movable cover 31 in transverse horizontal direction only a part of half of the screening device 11 accounts. The opening angle α can be between 15 and 25.

If in the tank 5 below the screening device 11 Foam on the surface of the rinsing liquid 7 this may, as usual, rise until the foam against the sieve device 11 meets. Further foam forms on the surface of the rinse liquid 7 in the tank 5 , this can be the cover 31 lift and into the dishwasher 3 drain where he passes through the pouring water is smashed. The invention thus enables a substantial regeneration of the rinse liquor.

The features of the invention disclosed in the foregoing description, in the drawings and in the claims may be essential both individually and in any combination for the realization of the invention in its various embodiments.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102011008491 A1 [0006]
• DE 19750266 A1 [0008]

Claims (13)

A dishwasher (1) for a dishwashing machine (1) for insertion between a washing compartment (3) and a tank (5) for collecting and discharging soiled dishwashing water (7) of the dishwasher, comprising at least one strainer adapted to rinse water from the washing compartment (3) in the tank (5) through the sieve (13, 15, 16) is passed, and a sieve frame (33) carrying at least one sieve (13, 15, 16), characterized in that the sieve device ( 11) has an opening (21) for discharging foam from the tank (5) in the washing compartment (3) and a cover (31) which is movably mounted on the screen frame (33) between a closed position in which the cover (31) closes the opening (21) and an open position in which the cover (31) at least partially releases the opening (21). Sieve device (11) after Claim 1 , characterized in that the cover (31) is movable perpendicular to a plane defined by the screen frame surface. Sieve device (11) after Claim 2 Characterized in that the cover (31) about a pivot axis (S) is rotationally movable. Screening device (11) according to one of the preceding claims, characterized in that the cover (31) in the closed position rests on the screen frame (31) and / or expands above the opening (21). Sieve device (11) after Claim 4 , characterized in that the cover (31) is movable from the closed position to the open position up to an end stop of at most 5 cm, at most 2 cm or at most 1 cm. Screening device (11) according to one of the preceding claims, characterized in that the cover (31) is rectangular. Screening device (11) according to one of the preceding claims, characterized in that the cover (31) is at least partially realized in the form of a sieve, in particular as a surface sieve (16). Screening device (11) according to one of the preceding claims, characterized in that the cover (31) in the open position between the cover (31) and the screen frame (33) extending transversely to a plane of the screen frame (33) extending surface area ( 23) for foam which is located near a peripheral edge of the screen frame. Dishwasher (1), comprising a washing compartment (3), a tank (5) for collecting polluted flushing water (7) and a between the flushing chamber (3) and the tank (5) inserted screening device (11) according to any one of the preceding claims, characterized characterized in that the cover (31) is adapted to be lifted from foam in the tank (3) of the dishwasher (1), in particular depending on the vertical height of the foam, from the closed position. Dishwasher (1) after Claim 9 , characterized in that the screen frame (33) relative to the washing compartment (3) and / or tank (5) is fixedly mounted. Dishwasher (1) after Claim 9 or 10 , characterized in that the cover (31) in the vertical direction (V) is movable, wherein the cover is preferably rotatable about a in the horizontal direction (H) extending pivot axis (S). Dishwasher (1) according to one of Claims 9 to 11 , characterized in that the cover (31) in the open position, a passage surface (23) for foam releases, at least for the most part in a peripheral region of the washing compartment (3) with low dirt particle distribution, in particular near an inner wall (41, 42, 43, 44 ) of the washing compartment (3) is arranged. Dishwasher (1) according to one of Claims 9 to 12 , characterized in that the cover (31) in the open position a in the vertical direction (V) extending, preferably gap-shaped passage surface (23) releases foam, so that foam through the passage surface (23) transversely to the vertical direction (V) enter the washing compartment can, preferably in the direction of a relative to the passage surface (23) proximate inner wall (41, 42, 43, 44) of the washing compartment (3).

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