DE102011084917A1 - Dishwasher e.g. rack conveyer ware washer, for washing goods e.g. table-wares, has sewage pump connected or connectable with wash tank on suction side and with waste water pipe system on pressure side to pump part of liquid in tank - Google Patents

Abstract

The dishwasher has connected or connectable waste discharge pumps (74-1) provided with a washing system on a suction side and waste discharge piping systems (72-1, 73-1) on a pressure side for discharging a part of dirt particles. The dirt particles are separated from washing liquid i.e. fresh water, and a sewage pump (40) is connected or connectable with a wash tank (14-1) on the suction side and with a waste water pipe system (41) on the pressure side for temporarily pumping the part of the washing liquid that is collected in the wash tank. An independent claim is also included for a method for operating a dishwasher.

Description

The invention relates to a dishwasher according to the preamble of claim 1. In particular, the invention relates to a commercial dishware or utensil dishwasher, which is designed as a programmer or as a conveyor dishwasher.

The invention further relates to a method for operating such a dishwasher.

The invention is thus directed to a method for operating a dishwasher or to a dishwasher itself, which has at least one designed as a recirculation cycle washing system. The washing system has a nozzle system with at least one washing nozzle for spraying washing liquid onto the items to be cleaned, a washing tank for collecting at least part of the sprayed washing liquid and a washing pump for supplying washing liquid collected in the washing tank to the at least one washing nozzle. Furthermore, in the dishwasher according to the invention, one of the at least one washing zone associated dirt collecting system is provided, which serves to separate dirt particles from the sprayed and by gravity back flowing back into the washing tank washing liquid. In addition, a dirt discharge connected to the dirt collection system and the pressure side with a Schmutzaustragrohrsystem or connectable Schmutzaustragpumpe is provided for on-demand discharge of at least a portion of the dirt collected with the dirt collection system of the washing liquid dirt particles.

Dishwashing or utensil dishwashers according to the invention are either programmer machines ("box-type goods washers" or also called "batch dish washers") or conveyor dishwashers (called "conveyor ware washers").

In particular, conveyor-type washer washers are flight-type goods washers or rack-conveyer-washers-washers. Transport dishwashers are commonly used in the commercial sector. In contrast to program machines, in which the items to be cleaned remain stationary in the machine during cleaning, transportation of the items to be washed takes place through various treatment zones of the conveyor dishwashers.

A conveyor dishwasher usually has at least one prewashing zone and at least one main washing zone, which, viewed in the transport direction of the items to be washed, is arranged after the prewashing zone (s). As seen in the transport direction after the main wash zone (s), at least one post-wash zone or pre-wash zone and at least one final wash zone downstream of the post-wash zone (s) is usually arranged. As seen in the direction of transport, the items to be washed either directly on the conveyor belt or in the transport direction usually pass through an inlet tunnel, the subsequent prewash zone (s), main wash zone (s), post wash zone (s), rinse zone (n ), a drying zone in an outlet section.

The washing zones of the conveyor dishwasher are each assigned a washing system which has a washing pump and a line system (washing line system) connected to the washing pump, via which washing liquid is supplied to the nozzle system or the at least one washing nozzle of the nozzle system. The washing liquid supplied to the at least one washing nozzle of the nozzle system is sprayed onto the items to be washed in the respective washing zones of the conveyor dishwasher, which is transported by a transport device of the conveyor dishwasher through the respective washing zones. Each washing zone is associated with a tank in which the liquid sprayed by the washing nozzles is received and / or in which liquid is provided for the nozzle systems of the respective treatment zones.

In the transport dishwashers usually known from the prior art, rinse liquid in the form of fresh water, which can be added pure or with further additives, such as, for example, rinse aid, is sprayed onto the dishes via the spray nozzles of the final rinse zone. At least part of the sprayed rinse liquid is transported via a cascade system counter to the transport direction of the ware from zone to zone.

The sprayed rinse liquid is collected in a tank (Nachwaschtank) of Nachwaschzone, from which it is conveyed via the washing pump belonging to the Nachwaschzone washing system to the spray nozzles (Nachwaschdüsen) Nachwaschzone. In the post-wash zone, washing liquid is rinsed from the items to be washed. The resulting liquid flows into the wash tank of at least one main wash zone, which is seen upstream of the post-wash zone in the transport direction of the ware. Here, the liquid is usually provided with a cleaner and sprayed by a belonging to the washing system of the main wash zone pump system (washing pump) via the nozzles (washing nozzles) of the main wash zone on the dishes. From the wash tank of the main wash zone flows Liquid - if no other main wash zone is provided - then in the prewash tank prewash zone. The liquid in the pre-wash tank is sprayed onto the items to be washed via the pre-wash zone prewash nozzles via a pump system (prewash pump) belonging to the prewashing zone washing system in order to remove coarse impurities from the items to be washed.

Usually, conveyor dishwashing machines are equipped with rinsing pumps, which supply the final rinse liquid to be sprayed in the final rinse zone to the rinsing zone of the rinsing zone. This ensures in particular a quasi-constant volume flow of the final rinse liquid in the final rinse zone. However, it is also conceivable to use the on-site line pressure, for example the pressure of the fresh water supply, in order to feed the final rinse liquid to the line system of the final rinse zone. In this latter case, a controllable valve may be provided between the piping system and the spray nozzles of the rinse zone in order to achieve a temporary or complete interruption of the supply of rinse liquid to the spray nozzles.

Programmers are manually loading and unloading dishwashers. These include crockery through-feed dishwashers, which are also called hood-type goods washers, or front loader goods washers. Front loaders may be under counter machines, top counter machines, or freestanding front loaders.

A dishwasher designed as a programmer usually has a treatment chamber for cleaning items to be washed. In this treatment chamber designed as a recirculation circuit washing system is usually formed. Usually, a wash tank is arranged under the treatment chamber, in which liquid can flow back out of the treatment chamber by gravity. In the wash tank is washing liquid, which is usually water, the cleaner may be supplied if necessary.

The washing system includes a washing pump, a conduit system connected to the washing pump, and a nozzle system having at least one washing nozzle. The washing liquid located in the wash tank can be conveyed from the washing pump via the line system to the at least one washing nozzle and sprayed through this at least one washing nozzle in the treatment chamber on the items to be cleaned. The sprayed washing liquid then flows back by gravity into the wash tank.

Conventional dishwasher designed as automatic dishwasher usually operate in two main process steps, namely first washing with washing liquid and then rinsing with heated fresh water, which rinse aid ("rinse aid") is metered. The washing liquid contains water and dosed detergent. In order to be able to carry out these two process steps, a commercial dishwasher designed as a programmer is usually equipped with two independent liquid systems which are completely separated from one another. One of these two fluid systems is a washing fluid circuit, which is responsible for the washing of the dishes and is carried out with pre-used liquid from the wash tank. The other fluid system is a rinse fluid system which typically has a water heater for heating fresh water.

The main task of rinsing with rinse liquid is to remove the washing liquid located on the items to be washed. In addition, the final-rinse liquid drained into the wash tank during rinsing serves to regenerate the washing liquid in the wash tank.

Before new fresh water is supplied for rinsing, the same amount of washing liquid is usually pumped out of the wash tank into the on-site sewage network.

A special type of commercial dishwasher in the form of program machines are hood-type dish washers. Your treatment chamber for cleaning dishes is surrounded by a hood. The hood can be lifted up to load the treatment chamber and then lowered again for the treatment of the dishes. Hoodless dishwashers are almost without exception provided with an inflow table and an outlet table. The feed table is designed in many cases as a pre-cleaning station for pre-cleaning of the items to be washed by rinsing and / or by manually removing contaminants from the items to be washed before the items to be washed is inserted into a Spülgutkorb in the hood machine. Pre-cleaning by pre-rinsing is normally done manually. Pre-rinsing during pre-cleaning is usually carried out with on-site, cold or preheated fresh water. In some cases additional pre-rinse cleaning chemistry is used. The outlet table is used for drying and for unloading the wash ware baskets.

Regardless of whether the dishwasher is designed as a programmer or conveyor dishwasher, usually find a manual pre-clearing and manual pre-washing the Washed instead, before the dishes to be cleaned is supplied to the dishwasher. In this way, premature contamination of the washing liquid due to coarse contaminants, such as napkins or food scraps, are prevented.

By the invention, the problem to be solved is to increase the Spülgutdurchlaufkapazität a dishwasher of the type mentioned. In particular, a method and a dishwasher is to be specified, with the per unit time - compared to conventional machines - larger amount of items can be effectively cleaned without requiring additional staff to load and unload the machine is required.

This object is achieved in terms of the dishwasher according to the invention by the subject of independent claim 1.

Accordingly, a dishwashing machine is proposed which has at least one washing system designed as a recirculation circuit, wherein the at least one washing system has a nozzle system with at least one washing nozzle, a washing tank and a washing pump for feeding washing liquid collected in the washing tank to the at least one washing nozzle. The at least one washing system is associated with a dirt collecting system, which is designed to separate dirt particles from the sprayed and by gravity flowing back into the wash tank scrubbing liquid. A Schmutzaustragpumpe is the suction side connected to the dirt collecting system and the pressure side with a Schmutzaustragrohrsystem or connectable, if necessary, to discharge at least a portion of the separated with the Schmutzaustragsystem of the washing liquid dirt particles from the washing zone.

According to the invention, the dishwasher further comprises a suction side connected to the wash tank and the pressure side with the sewage pipe system or connectable sewage pump on to demand pumping of at least a portion of the collected in the wash tank scrubbing liquid.

The advantages achievable with the solution according to the invention are obvious:
By providing on the one hand a dirt collecting system and on the other hand a pumping system consisting of the suction side with the wash tank and pressure side connected to the sewage pipe system or connectable sewage pump, it is possible to automate the usually carried out manually outside the washing zone prewashing and assign the dishwasher as a function. By this performed by the dishwasher function can thus be dispensed with the step of manual pre-cleaning of the items to be washed. As a result, working hours are saved, thereby increasing the Spülgutdurchlaufkapazität the dishwasher.

Investigations carried out within the scope of the invention have shown that with a conventional hood washer, which can generally only be operated by a single person, a capacity increase of 20% can be achieved with the solution according to the invention. This is due in particular to the fact that the additional machine function of the integrated pre-wash makes it possible to dispense with the pre-wash to be carried out manually in the case of conventional machine loading. In conventional dishwashers such an increase in capacity can only be achieved if more personnel are used on the dishwasher.

The object underlying the invention is further achieved by a method for operating a dishwasher according to the independent claim 21.

In the method according to the invention, the washing pump of the dishwasher is controlled during a prewash phase in such a way that at least a portion of the washing liquid collected in the wash tank is fed to the at least one washing nozzle in order to be able to pre-wash the items to be washed. Subsequently, during a dirt discharge phase, the soil discharge pump is activated in such a way that at least part of the dirt particles separated from the washing liquid by the soil collecting system is fed to the dirt discharge pipe system in order to be able to discharge the dirt particles from the machine or the washing zone. During a subsequent main wash phase, the washing pump is controlled such that at least a portion of the washing liquid collected in the wash tank is supplied to the at least one washing nozzle in order to clean the items to be washed. Finally, during a pumping-down phase, the wastewater pump is actuated in such a way that at least part of the washing liquid collected in the wash tank is fed to the sewage pipe system.

Advantageous developments of the dishwasher according to the invention are given in the dependent claims 2 to 19 and the method according to the invention in the dependent claims 21 to 24.

Thus, it is provided in a preferred development of the dishwasher according to the invention that the dirt collecting system a Tankabdecksieb and a dirt collecting area for collecting by means of Tankabdecksiebes of Having the washing liquid separated dirt particles. The dirt collecting area is preferably open at the top but fully closed at the sides. The Schmutzaustragrohrsystem should in this case be connected to the dirt collection area or connectable.

It is conceivable here to arrange the tank cover screen over the dirt collecting area and to provide it with a drainage slope in the direction of a supply opening, whereby the dirt collecting area formed open at the top should be arranged below the supply opening in such a way that the dirt particles separated by the tank cover screen pass through the supply opening into the feed opening Dirt collecting area can get.

By providing the Tankabdecksiebes preferably designed as a surface sieve on the one hand and the dirt collecting system on the other hand ensures that the rinsed in the washing system dirt particles and introduced in another way in the washing liquid dirt particles effectively separated from the washing liquid and collected or concentrated in the dirt collecting area can be. Since the dirt collecting area at the sides is completely closed (ie, fluid-tight), the dirt particles accumulated in the dirt collecting area are encapsulated in the washing tank in the washing tank, so that even smaller dirt particles, which possibly arise due to dissolution of the dirt particles collected in the dirt collecting area, can not get back into the washing liquid received in the wash tank.

On the other hand, in the solution according to the invention, it is provided that the dirt collecting area is connected or connectable to the dirt discharge pipe system via the soil discharge pump, whereby the dirt particles collected in the dirt collecting area can be removed from the washing system with the aid of the dirt discharge pipe system. In this way, the residence time of the dirt particles in the dirt collecting area and thus in the washing system can be reduced so that a dirt dissolution due to the circulation of the washing liquid in the washing system can no longer occur.

Accordingly, with the solution according to the invention - despite the automatic pre-cleaning carried out in the machine - a constant rinsing result can be achieved even with increasing washing time, with re-soiling of the ware effectively prevented by dirt particles in the washing liquid.

On the other hand, the solution according to the invention offers an effective method for discharging dirt particles from the washing liquid, so that a longer service life of the washing liquid can be realized in comparison to conventional solutions. In this way, it is possible to use the washing liquid for cleaning a larger amount of dishes before it has to be replaced. This saves in particular fresh water, cleaner and heating energy.

Hereinafter, embodiments of the solution according to the invention are described in detail with reference to the accompanying drawings.

In the drawings show:

1 schematically a trained in the form of a conveyor dishwasher dishwasher according to a first embodiment;

2 schematically a dishwasher designed in the form of a conveyor dishwasher according to a second embodiment;

3 a hydraulic schematic of a washing system designed as a conveyor dishwasher dishwasher with integrated prewash and dirt removal;

4 a hydraulic schematic of a washing system designed as a programmer dishwasher with integrated prewash and dirt removal; and

5a -C program flow descriptions for a dishwasher with integrated prewash function and dirt discharge.

In 1 Figure 3 is a schematic longitudinal sectional view of an example of a conveyor dishwasher constructed in accordance with the teachings of the present invention 50 shown. The conveyor dishwasher 50 as shown in 1 has a prewash zone 51 and a main wash zone 52 on, which in the transport direction T of (in 1 not shown) ware viewed after the prewash zone 51 is arranged. In the transport direction T seen after the main wash zone 52 is at the in 1 shown transport dishwasher 50 a Nachwasch- or pre-rinse zone 53 and one of the post-wash or pre-rinse zone 53 downstream rinse zone 54 arranged.

In the illustrated transport dishwasher 50 are at least the prewash zone 51 as well as the main wash zone 52 each as a washing system 10-1 or washing system 10-2 educated.

That either directly on a conveyor belt 58 Recorded items to be washed or items held by baskets runs in the transport direction T through an inlet tunnel 55 , the subsequent prewash zone 51 , the main washing zone 52 , the post-washing zone 53 , the final rinse zone 54 and a drying zone 56 in an outlet section 57 one.

The mentioned treatment zones 51 . 52 . 53 . 54 the conveyor dishwasher 50 are each spray nozzles 13-1 . 13-2 . 13-3 . 13-4 assigned, over which liquid is sprayed onto the items to be washed, that of the conveyor belt 58 through the respective treatment zones 51 . 52 . 53 . 54 is transported. At least the pre-wash zone 51 , the main wash zone 52 and the Nachwasch- or Vorspülzone 53 is a tank (wash tank 14-1 . 14-2 . 14-3 ), in which sprayed washing liquid received and / or washing liquid for the spray nozzles 13-1 . 13-2 . 13-3 the zones concerned 51 . 52 . 53 provided.

The prewash zone 51 , the main washing zone 52 and the post-wash zone 53 the conveyor dishwasher 50 according to the in 1 shown first embodiment of the invention each have a washing system 10-1 . 10-2 . 10 . 3 on. Every wash system 10-1 . 10-2 . 10-3 is made up of a washing pump 11-1 . 11-2 . 11-3 , one with the washing pump 11-1 . 11-2 . 11-3 connected line system 12-1 . 12-2 . 12-3 and the one with the pipe system 12-1 . 12-2 . 12-3 connected spray nozzles 13-1 . 13-2 . 13-3 together.

Furthermore, a control device shown only schematically in the drawings 100 provided, which in as a conveyor dishwasher 50 trained embodiment of the invention (among others) serves to the respective washing pump 11-1 . 11-2 . 11-3 the washing systems 10-1 . 10-2 . 10-3 to drive suitably during a washing process, at least temporarily via the associated line system 12-1 . 12-2 . 12-3 Washing liquid to the spray nozzles 13-1 . 13-2 . 13-3 of the respective washing system 10-1 . 10-2 . 10-3 supply the associated nozzle system. At the same time, the control device is used 100 the inventive, coordinated driving the washing pump 11-1 and the dirt discharge pump 74-1 To the dirt discharge just near the inlet area of the machine 50 to improve. By this measure can be dispensed on a machine usually made manual pre-clearing (pre-washing), in particular the circumstance is taken care that coarse contaminants, such as food scraps or napkins, which were previously removed by a manual Vorabräumung of the items not the washing power of the prewash zone 51 influence in a negative way.

The structure and functioning of the in 1 and 2 shown transport dishwasher 50 the at least one washing zone 51 associated washing system will be described later with reference to the hydraulic scheme according to 3 described in more detail.

At the in 1 shown transport dishwasher 50 Rinse liquid in the form of fresh water, which can be mixed with other chemical additives, such as rinse aid, over the above and below the conveyor belt 58 arranged spray nozzles 13-4 the rinse zone 54 on the in 1 not shown dishes sprayed. As in 1 can be shown in the final rinse zone 54 also laterally arranged spray nozzles 13-5 be provided.

Part of the in the rinse zone 54 sprayed rinse liquid is transported via a cascade system against the transport direction T of the ware from zone to zone. The remaining part will be over a valve 59 and a bypass line 60 directly into the pre-wash tank 14-1 the prewashing zone 51 directed.

The in the final rinse zone 54 sprayed rinse liquid is in the tank (Nachwasch- or pre-rinse tank 14-3 ) the Nachwasch- or pre-rinse zone 53 from which they are about to the washing system 10-3 the Nachwasch- or pre-rinse zone 53 belonging washing pump 11-3 to the spray nozzles 13-3 (Nachwasch- or Vorspüldüsen) Nachwasch- or Vorspülzone 53 is encouraged. In the Nachwasch- or pre-rinse zone 53 Washing liquid is rinsed from the dishes.

The resulting liquid flows into the wash tank 14-2 the main washing zone 52 , is usually provided with a cleaner and with the help of a to the washing system 10-2 the main washing zone 52 belonging washing pump 11-2 over the spray nozzles 13-2 (Washing nozzles) of the main washing zone 52 belonging washing system 10-2 sprayed on the dishes.

From the wash tank 14-2 the main washing zone 52 The washing liquid then flows into the prewash tank 14-1 the prewashing zone 51 , The in the prewash tank 14-1 collected washing liquid is in the prewash zone 51 with the help of a to the washing system 10-1 the prewashing zone 51 belonging washing pump 11-1 over the spray nozzles 13-1 (Prewash nozzles) of the pre-wash zone 51 belonging washing system 10-1 sprayed on the dishes to remove coarse contaminants from the dishes.

At the in 1 shown transport dishwasher 50 has the main wash zone 52 one Tank strainer 20-2 on, which is above the main tank 14-2 is arranged. In operation of the conveyor dishwasher 50 is via the spray nozzles 13-2 (Washing nozzles) of the washing system 10-2 Washing liquid sprayed on the dishes. The sprayed washing liquid flows by gravity into the wash tank 14-2 the main washing zone 52 back, taking in the main wash zone 52 dirt particles rinsed from the washware from the tank cover strainer 20-2 be retained if the dirt particles larger than the mesh size of Tankabdecksiebes 20-2 are. Preferably, the mesh size of the Tankabdecksiebes 20-2 about 1 mm to 4 mm.

At the in 1 schematically illustrated transport dishwasher 50 must to clean the Tankabdecksiebes 20-2 the purge operation is interrupted to the Tankabdecksieb 20-2 to clean manually.

Part of the main wash zone 52 Sprayed washing liquid passes through an overflow system 61 in the wash tank (Vorwaschtank 14-1 ) of the prewashing zone 51 , As well as the main wash zone 52 is the prewash zone 51 with a tank strainer designed as a flat screen 20-1 equipped. This tank cover strainer 20-1 is above the wash tank (prewash tank 14-1 ) of the prewashing zone 51 arranged to remove debris from that in the prewash zone 51 sprayed and by gravity into the prewash tank 14-1 to separate back flowing washing liquid. The mesh size of Tankabdecksiebes 20-1 is preferably in a range between about 1 mm to 4 mm.

Since - as stated - the dirt concentration of the washing liquid in the prewash zone 51 is the largest, since most of the dirt accumulates here, is the in 1 illustrated transport dishwasher 50 with one of the pre-wash zone 51 associated dirt collecting system 70 equipped one in the pre-wash zone 51 , and especially within the pre-wash tank 14-1 arranged dirt collection area 71-1 having. The structure and functioning of the in 1 shown transport dishwasher 50 used for dirt collection system 70 is described below with reference to the illustration in 3 described in more detail.

At the in 1 illustrated embodiment of the conveyor dishwasher 50 serves the dirt collection area 71 for collecting with the help of Tankabdecksiebes 20-1 from the washing liquid separated dirt particles. Specifically, and as explained below with reference to the hydraulic scheme in 3 is described in more detail, is the dirt collection area 71-1 as one in the prewash tank 14-1 arranged, formed on their sides completely closed executed chamber, which is open at the top, so that this opening with the help of Tankabdecksiebes 20-1 separated dirt particles in the chamber-shaped dirt collecting area 71-1 can reach. Because of the dirt collection area 71 is executed on the sides completely closed, can be effectively prevented that in the dirt collecting area 71-1 collected dirt particles back into the pre-wash tank 14-1 arrive and those in the prewash tank 14-1 can pollute collected washing liquid.

In detail, and as explained below with reference to the illustration in 3 is described in more detail, it is preferred if the Tankabdecksieb 20-1 above the dirt collecting area 71-1 is arranged and a drainage slope in the form of a toward a supply port 22 having directed slope, wherein the upwardly open trained dirt collecting area 71-1 below the feed opening 22 is arranged so that with the help of Tankabdecksiebes 20-1 separated dirt particles through the feed opening 22 In the dirt collection area 71-1 can reach.

It is conceivable in this case in particular that the Tankabdecksieb 20-1 at least partially funnel-shaped, wherein the feed opening 22 within the funnel-shaped area 21 of tank cover strainer 20-1 , and preferably in the center of the funnel-shaped area 21 of tank cover strainer 20-1 is formed (see in particular also the illustration in 3 ).

That at the in 1 illustrated embodiment used dirt collection system 70 also has a dirt collecting area 71-1 connected Schmutzaustragrohrsystem consisting of a standpipe 72-1 and a dirty water pipe 73-1 on, for discharging the in the dirt collecting area 71-1 collected dirt particles from the prewash zone 51 , As shown, is in the Schmutzaustragrohrsystem 72-1 . 73-1 a dirt discharge pump 74-1 arranged. The suction inlet of the dirt discharge pump 74-1 is about that to Schmutzaustragrohrsystem 72-1 . 73-1 belonging standpipe 72-1 with the lower part of the dirt collecting area 71-1 connected. The discharge side outlet of the dirt discharge pump 74-1 discharges into the dirty water pipe belonging to the dirt discharge pipe system 73-1 ,

At the in 1 illustrated embodiment, the dirty water line 73-1 to an external dirt collector 80 which is outside the prewashing zone 51 in front of the inlet tunnel 55 the conveyor dishwasher 50 is arranged. This externally executed Dirt pocket 80 preferably has a sieve and a connection 81 to a sewage system.

Because when spraying washing liquid in the prewashing zone 51 It is not possible to prevent part of the sprayed washing liquid from entering the dirt collecting area 71 are reached via the Schmutzaustragpumpe 74-1 not only with the help of the Tankabdecksiebes 20-1 separated dirt particles, but also a part of the washing liquid from the prewash zone 51 promoted. In the dirt catcher 80 the material discharged from the dirt collecting area 71-1 (dirt particles and washing liquid) is sieved, the liquid components (washing liquid) being discharged through the drainage port 81 fed to a sewer system and in the dirt collecting container 80 remaining solids (dirt particles) can then be disposed of.

As in 2 it is alternative to that shown in FIG 1 illustrated embodiment also conceivable, the dirt particles with the wastewater from the prewashing zone 51 into a waste management system 82 to pump, this system 82 either directly next to the conveyor dishwasher 50 or may be further away. As a waste disposal system 82 For example, squeeze systems can be used to separate solids and liquids and / or comminution systems (grinding, shredding systems, etc.). Preferably, in the waste management system 82 also from the dirt collection area 71-1 discharged material (dirt particles and washing liquid) sieved, the liquid components (washing liquid) via a drain connection 83 fed to a sewer system and in the waste management system 82 remaining solids (dirt particles) can then be disposed of. In the embodiment of the 2 serves the controller 100 likewise the inventive, coordinated control of the washing pump 11-1 and the dirt discharge pump 74-1 to the dirt discharge, especially in the inlet area of the machine 50 to improve.

In the in the 1 and 2 illustrated exemplary embodiments of the conveyor dishwasher according to the invention 50 this is the prewash zone 51 associated washing system each further with a sewage pump 40 equipped, which suction side with the wash tank 14-1 and pressure side with a sewer pipe system 41 connected or connectable. Like the other pumps belonging to the washing system (washing pump 11-1 , Dirt discharge pump 74-1 ) is the wastewater pump 40 from the controller 100 controllable, if necessary, at least part of the wash tank 14-1 collected washing liquid through the sewer pipe system 41 to pump into a constructional sewage network.

According to the invention is also a device 42 provided for determining the degree of contamination of the washing liquid. In the example in the 1 and 2 illustrated embodiments, the device 42 for determining the degree of soiling of the washing liquid, at least one turbidity sensor which is so in the sewage pipe system 41 is arranged and adapted to pump out washing liquid from the wash tank 14-1 the degree of pollution by the sewage pipe system 41 to determine flowing washing liquid.

Hereinafter, referring to the in 3 illustrated hydraulic scheme of the structure and operation of a washing system described which, for example, in a dishwasher designed as a dishwasher according to the 1 and 2 is used. Nevertheless, the washing system can also be used in a dishwasher designed as a programmer, as will be described below with reference to the illustration in FIG 4 is described.

This in 3 schematically illustrated dirt collecting system 70 is inside a wash tank 14-1 a transport dishwasher 50 arranged. The dirt collecting system 70 has a Tankabdecksieb 20-1 on, which preferably in the wash tank 14-1 above the level of liquid in the wash tank 14-1 recorded washing liquid is arranged. The tank cover strainer 20-1 serves to separate dirt particles from the sprayed and by gravity flowing back into the wash tank scrubbing liquid. For this reason, is for the Tankabdecksieb 20-1 to provide a suitable mesh size.

Furthermore belongs to the dirt collecting system 70 a dirt collecting area 71 , which is formed as a completely closed chamber which is open at the top. About the opening of the trained as a chamber dirt collecting area 71 Be the of the Tankabdecksieb 20-1 separated dirt particles the dirt collection area 71 fed. For this purpose, it is preferable if the Tankabdecksieb 20-1 a drainage slope in the form of one in the direction of a feed opening 22 having directed slope, wherein the upwardly open trained dirt collection area 71 below the feed opening 22 is arranged. As in 3 For example, it is conceivable that the Tankabdecksieb 20-1 at least partially funnel-shaped, wherein the feed opening 22 within the funnel-shaped area 21 of tank cover strainer 20-1 , and preferably in the tapered area of the funnel-shaped area 21 of tank cover strainer 20-1 , is trained.

Further, it is preferable if the dirt collecting area 71 is funnel-shaped at the upper end to enter the feed opening 22 of tank cover strainer 20-1 to be used or recorded.

During operation of the dishwasher is in the washing system associated washing zone 51 Washing liquid sprayed, with a portion of the sprayed washing liquid on the Tankabdecksieb 20-1 in the wash tank 14-1 flowing back. The remainder of the sprayed washing liquid flows by gravity directly over that in the Tankabdecksieb 20-1 provided feed opening 22 in the dirt collection area 71 ,

If the dishwasher is designed as a conveyor dishwasher (cf. 1 and 2 ), is - as already indicated - during operation of the dishwasher washing liquid on the spray nozzles 13-1 (Prewash nozzles) or over the spray nozzles 13-2 (Wash nozzles) sprayed on the dishes. If the dishwasher, however, designed as a programmer (see. 4 ), so that the items to be treated remains stationary and the individual treatment steps take place in succession, the washing liquid is in the wash zone on the in operation of the dishwasher in the washing 4 with the reference number " 13 "Designated washing nozzles sprayed on the dishes.

The rinsed during the washing process of the dishes dirt particles are - if they are larger than the mesh size of Tankabdecksiebes 20-1 are - from the tank cover strainer 20-1 prevented from getting into the wash tank 14-1 to get collected washing liquid. Rather, those of the Tankabdecksieb 20-1 separated dirt particles through the drainage slope to the feed opening 22 moved and thus reach the dirt collection area 71 , Because the side walls of the dirt collection area 71 are formed completely closed, which can be in the dirt collecting area 71 collected dirt particles no longer get into the washing liquid, which in the wash tank 14-1 is collected. Even if by falling of washing liquid in the dirt collecting area 71 collected dirt particles are further crushed, this dirt can still not in the the wash tank 14-1 get collected washing liquid and thus increase the dirt content of the washing liquid.

Around the dirt collecting area 71 to be able to empty automatically, has the dirt collection system 70 Furthermore, a Schmutzaustragrohrsystem. This Schmutzaustragrohrsystem consists in the 3 illustrated embodiment of the Schmutzaustragsystems 70 from a standpipe 72-1 , which is connected to the lower part of the dirt collecting area 71 connected is. The standpipe 72-1 is with the suction inlet of a dirt discharge pump 74-1 connected. The discharge side outlet of the dirt discharge pump 74-1 flows into a dirty water pipe 73-1 , so when activating the dirt discharge pump 74-1 the contents of the dirt collection area 71 can be removed from the washing zone.

Furthermore, in the in 3 illustrated hydraulic scheme a suction side with the wash tank 14-1 and pressure side with a sewer pipe system 41 connected or connectable sewage pump 40 provided for pumping off at least part of the in the wash tank as needed 14-1 collected washing liquid.

This in 4 Hydraulic diagram shown schematically shows a washing system, which is particularly suitable for use in the treatment chamber of a dishwasher designed as a programmer. Such a dishwasher has a program control device 100 for controlling at least one cleaning program and a treatment chamber closable by a door (not shown) or a hood (not shown) for receiving items to be cleaned (not shown), such as crockery, cutlery, pots, pans and / or trays.

Under the treatment chamber 4 there is a wash tank 14 for receiving sprayed liquid from the treatment chamber 4 , A washing pump 11 is for pumping washing liquid from the wash tank 14 through a washing fluid line system 5 to washing nozzles 13 intended. The washing nozzles 13 are in the treatment chamber 4 directed to the area of the items to be cleaned to spray washing liquid on the items to be cleaned. The sprayed washing liquid flows by gravity into the wash tank 14 back. This will form the wash tank 14 , the washing pump 11 , the washing fluid line system 5 , the washing nozzles 13 together with the treatment chamber 4 a washing liquid circuit.

A rinse aid system includes a rinse pump 44 for conveying rinse liquid through a rinse aid system 48 to rinse nozzles 49 which are in the treatment chamber 4 are directed to the area of the items to be cleaned. The of the rinse aid nozzles 49 sprayed rinse liquid flows by gravity from the treatment chamber 4 in the wash tank 14 , The Klarspülleitungssystem 48 connects the pressure side of the rinse pump 44 with the rinse aid nozzles 49 ,

The washing nozzles 13 and the rinse nozzles 49 can be arranged above and / or below and, if desired, also laterally of the Spülgutbereich and in each case directed against the Spülgutbereich, in which in the treatment chamber 4 the items to be washed can be positioned to be cleaned.

Preferably, a plurality of washing nozzles 13 at least one upper washing arm, a plurality of washing nozzles 13 at least one lower wash arm, a plurality of rinse nozzles 49 on at least one upper rinse aid and a plurality of rinse nozzles provided on at least one lower rinse.

Before rinsing liquid is sprayed, in each case one of the amount of washing liquid corresponding to the amount of rinsing liquid to be sprayed is removed from the washing tank 14 by means of a wastewater pump 40 pumped, the suction side to a sump of the wash tank 14 connected.

If before a first start of the automatic dishwasher designed as a programmer of the wash tank 14 is empty, it must first via a fresh water line (not shown) or by means of the rinse aid system, the rinse pump 44 contains, to be filled with fresh water.

The final rinse liquid may be fresh water or rinse aid mixed with rinse aid.

The washing liquid contains detergent ("detergent"), which in the wash tank 14 contained liquid from a Reinigerzudosiervorrichtung (not shown) is metered.

The dishwasher according to the in 4 shown hydraulic schemes is each with a fresh water connection 46 provided, which is connectable to a fresh water supply network. The fresh water connection 46 is about one of the controller 100 controllable fresh water supply valve and a Rücksaugverinderer ("air gap") and, preferably, a water heater 45 with the suction side of the rinse pump 44 connectable. The fresh water can rinse aid ("rinse aid"), for example, in the water heater 45 be dosed.

The water heater 45 is provided with at least one level sensor for controlling the liquid level in the water heater 45 by opening and closing the fresh water valve at the fresh water connection 46 by means of the control device 100 ,

Like the transport dishwashers described above, the dishwasher, which is designed as a program automaton, is designed in accordance with the type described in 4 shown hydraulic schemes without an external (ie outside the machine or treatment chamber 4 arranged) pre-cleaning station, since in the illustrated embodiments, a pre-cleaning of the items to be washed within the treatment chamber 4 he follows. In particular, according to the invention thus eliminates a time-consuming (manual) pre-cleaning before the items to be washed in the treatment chamber 4 is given.

So that the pre-cleaning of the machine within the treatment chamber 4 can be carried out without too much polluting the washing liquid (which would reduce the quality of a subsequent washing process), which is in 4 illustrated washing system with a dirt collecting system 70 and a suction side with the wash tank 14 and pressure side with a sewer pipe system 41 connected or connectable sewage pump provided, if necessary, at least part of the wash tank in the 14 to pump out collected washing liquid.

There is also a device 42 for determining the degree of soiling of the washing liquid, this device 42 preferably has at least one turbidity sensor, which is arranged and designed in such a way to pump out washing liquid from the wash tank 14 the degree of pollution by the sewage pipe system 41 to determine flowing washing liquid.

The structure and functioning of the washing system 70 were already referring to the illustration in 3 described. To avoid repetition, reference is made to the previous statements.

The following is with reference to the in the 5a to c shown program sequences, the interaction of the washing pump 11 (respectively. 11-1 ), the dirt discharge pump 74 (respectively. 74-1 ) and the wastewater pump 40 described. In detail, according to the invention is a control device 100 provided, which is formed, optionally the washing pump 11 respectively. 11-1 , the dirt discharge pump 74 respectively. 74-1 and the sewage pump 40 in a concerted way,
- that during a Vorwaschphase S1 using the washing pump 11 respectively. 11-1 at least part of the wash tank 14 respectively. 14-1 collected washing liquid of the at least one washing nozzle 13 respectively. 13-1 is supplied; and or
- That during a Schmutzaustragungsphase S2 using the Schmutzaustragpumpe 74 respectively 74-1 at least part of the dirt trap system 70 From the washing liquid separated dirt particles the Schmutzaustragrohrsystem 72 . 73 respectively. 72-1 . 73-1 is supplied; and / or during a main wash phase S3 using the wash pump 11 respectively. 11-1 at least part of the wash tank 14 respectively. 14-1 collected washing liquid of the at least one washing nozzle 13 respectively. 13-1 is supplied; and or
- that during a pumping down S4 with the help of the sewage pump 40 at least part of the wash tank 14 respectively. 14-1 collected washing liquid the sewage pipe system 41 is supplied.

In the pre-washing phase S1, during which by means of the washing pump 11 respectively. 11-1 at least part of the wash tank 14 respectively. 14-1 collected washing liquid of the at least one washing nozzle 13 respectively. 13-1 is supplied to spray the washing liquid on the items to be cleaned, such coarse contaminants, such as food scraps are rinsed from the items to be washed, which are removed in conventional machines in the manual Vorwaschung of the items to be washed.

After the pre-wash phase S1 takes place at the in 5a schematically shown program flow a Schmutzaustragungsphase S2. In this Schmutzaustragungsphase S2 is using the Schmutzaustragpumpe 74 respectively 74-1 at least part of the dirt trap system 70 From the washing liquid separated dirt particles the Schmutzaustragrohrsystem 72 . 73 respectively. 72-1 . 73-1 fed. This is thus a (first) pump-down phase, which of the dirt discharge pump 74 respectively 74-1 is carried out. This is at least a major part of the dirt collection system 70 From the washing liquid separated dirt particles preferably in a (relative to the dishwasher) internally or externally provided dirt container pumped.

At the in 5a schematically shown program flow, the Schmutzaustragungsphase S2 does not take place immediately after completion of the pre-wash S1. Rather, between the end of Vorwaschphase S1 and the beginning of Schmutzaustragungsphase S2 is preferably a lasting about 1 to 2 seconds break, during which neither the washing pump 11 respectively. 11-1 still the dirt discharge pump 74 respectively 74-1 be controlled. This break is for better dirt concentration in the dirt collection area 71 the dirt collecting system 70 , By for a short time the operation of both the washing pump 11 respectively. 11-1 as well as the dirt discharge pump 74 respectively 74-1 be stopped, it is ensured that the discharged in Schmutzaustragungsphase S2 dirt particles in a particularly effective manner in the dirt collection area 71 the dirt collecting system 70 collect.

Subsequent to the dirt discharge phase S2, which lasts for example about 2 to 3 seconds, takes place in the in 5a shown schematically program the main wash phase S3 instead, during which by means of the washing pump 11 respectively. 11-1 at least part of the wash tank 14 respectively. 14-1 collected washing liquid of the at least one washing nozzle 13 respectively. 13-1 is supplied to spray this washing liquid on the items to be cleaned. In this way, remaining Spülgutanschmutzungen be removed from your items. Depending on the degree of soiling and / or the selected treatment program, the main wash phase usually takes 20 to 45 seconds.

After completion of the main wash phase S3 takes place in the in 5a schematically illustrated program sequence a further (second) pumping down S4, during which using the sewage pump 40 at least part of the wash tank 14 respectively. 14-1 collected washing liquid the sewage pipe system 41 is supplied.

Subsequently, a rinsing phase takes place, in particular in the case of a dishwasher designed as a programmer 55 in which clear rinsing liquid, in particular fresh water with optionally added rinse aid, rinses the already washed dishes with the aid of a rinsing system, ie the washing liquid still adhering to the dishes is rinsed off. The spraying of rinse liquid during the final rinse phase S5 simultaneously serves for the regeneration of that in the wash tank 14 respectively. 14-1 collected washing liquid.

At the in 5a The program sequence shown schematically takes place a measuring phase parallel or immediately after the final rinse phase S5 56 instead of determining the degree of soiling of the pumped down in the pumping phase S4 and in the sewage pipe system 41 located washing liquid. This can be done for example with a turbidity measurement. During the measuring phase S6, the quality of the washing liquid is thus checked. If a predefined or definable limit value is undershot, ie if the washing liquid investigated in the measuring phase S6 has a specific degree of turbidity (predetermined or determinable), then the amount of final rinse liquid sprayed during the rinsing phase S5 is correspondingly increased in order to sufficiently regenerate the washing liquid ( to dilute), so that then the washing liquid again has the predetermined quality. It is conceivable that the duration of the Rinse phase S5 is selected depending on the determined during the measurement phase S6 wash liquid quality.

• • Zeitdauer t1 der Vorwaschphase S1: 4 bis 12 Sekunden, bevorzugt 6 bis 10 Sekunden, noch bevorzugter 8 Sekunden;
• •t2 der Pause zwischen der Vorwaschphas Zeitdauer e S1 und der Schmutzaustragungsphase S2: 1 bis 3 Sekunden, bevorzugt 1 bis 2 Sekunden;
• • Zeitdauer t3 der Schmutzaustragungsphase S2: 1 bis 8 Sekunden, bevorzugt 2 bis 5 Sekunden;
• • Zeitdauer t4 der Hauptwaschphase S3: 10 bis 90 Sekunden, bevorzugt 20 bis 50 Sekunden, oder alternativ 40 bis 50 Sekunden, bevorzugt 42 bis 48 Sekunden;
• • Zeitdauer t5 der Abpumpphase S4: 2 bis 10 Sekunden, bevorzugt 3 bis 6 Sekunden;
• • Zeitdauer t6 der Klarspülphase S5 (je nach Verschmutzungsgrad der Waschflüssigkeit): 4 bis 10 Sekunden, bevorzugt 5 bis 8 Sekunden, noch bevorzugter 7 Sekunden.

For the individual phases are in the in 5a shown program sequence the following time periods conceivable:

• Time duration t1 of pre-wash phase S1: 4 to 12 seconds, preferably 6 to 10 seconds, more preferably 8 seconds;
• T2 of the pause between the prewash phase duration e S1 and the dirt discharge phase S2: 1 to 3 seconds, preferably 1 to 2 seconds;
• Time duration t3 of the dirt discharge phase S2: 1 to 8 seconds, preferably 2 to 5 seconds;
• Time period t4 of the main wash phase S3: 10 to 90 seconds, preferably 20 to 50 seconds, or alternatively 40 to 50 seconds, preferably 42 to 48 seconds;
• Duration t5 of the pumping out phase S4: 2 to 10 seconds, preferably 3 to 6 seconds;
• Time duration t6 of the final rinse phase S5 (depending on the degree of soiling of the washing liquid): 4 to 10 seconds, preferably 5 to 8 seconds, more preferably 7 seconds.

The values given above are to be considered as exemplary and not restrictive. In particular, the same or similar values for the in 5b respectively. 5c presented program sequences in question.

In 5b is another exemplary program flow for a dishwasher according to the present invention shown schematically. In contrast to the previously referring to the illustration in 5a described program sequence is in the in 5b program shown no break between the pre-wash S1 and the dirt discharge phase 52 intended. Rather, in the embodiment according to the in 5b program shown the Schmutzaustragpumpe 74 respectively 74-1 is still activated during the prewash S1 and initiated the Schmutzaustragungsphase S2. By omitting a pause between the prewash phase S1 and the dirt discharge phase S2 and providing a temporary overlap of the prewash phase Si and the dirt discharge phase S2, the overall duration of the wash cycle can be correspondingly shortened.

In 5c is another exemplary program flow for a dishwasher according to the present invention shown schematically. In detail are in 5c shown two consecutive cycles. In the first cycle, the in 5c marked with the character "➀" finds - as well as in the 5a shown program sequence - first a pre-wash S1 and then subsequent Schmutzaustragungsphase S2 and main wash phase S3 instead, again a break between the pre-wash S1 and the dirt discharge phase S2 is provided.

Unlike the in 5a shown program sequence takes place at the in 5c illustrated alternative in the first cycle ➀ after the main wash phase S3 no pumping phase S4 instead, but immediately the rinse phase S5.

In a subsequent second cycle, which in 5c is marked with the sign "➁", there is a prewash phase S1 and a main wash phase S3 and a pump-out phase S4, but no Schmutzaustragungsphase S2 after the prewash S1.

At the second cycle ➁ of the in 5c the program sequence shown schematically takes place parallel or immediately after the final rinse phase S5, the measurement phase S6, during which the degree of contamination of the pumped down in the pumping phase S4 and in the sewage pipe system 41 located washing liquid is determined. The amount of clear rinse liquid sprayed during the final rinse phase S5 in this case depends on the wash liquid quality determined in the measurement phase S6.

In embodiments of the dishwasher according to the invention, the control device 100 to set up, optionally the washing pump 11 (respectively. 11-1 ), the dirt discharge pump 74 (respectively. 74-1 ) and the wastewater pump 40 in a coordinated manner, so that the above with reference to the representations in the 5a to 5c described program sequences are feasible. In this case, it is conceivable, in particular, for the recirculation cycle of the washing system to be interruptible for a specific period of time t 2 after carrying out the prewash phase S1, and for the dirt particles to be discharged after the prewash phase S1 has been carried out or at the latest when this period of time t2 expires. This is the control device 100 via control lines 100-1 . 100-2 with the pumps 11 . 74 connected. If the washing pump circulation is interrupted for a short time, turbulences of the washing liquid may be deposited on the sieve. The kinetic energy of the dirt particles contained therein thereby decreases, so that these with the help of Schmutzaustragpumpe 74 easier in the dirt collection area 71 can be sucked. The control device 100 can be designed as part of a machine control or integrated with this.

The control device 100 preferably has a microprocessor with an executable program code on which the timing of the pump 11 . 74 triggers. In this case, the control device 100 preferably for cyclically repeating the coordinated activation of the washing pump 11 and the dirt discharge pump 74 be formed to ensure a regular Schmutzpartikelaustrag.

The dirt discharge pump 74 may also be designed to continuously or at predetermined times or events in the dirt collecting area 71 collected dirt particles together with the also in the dirt collecting area 71 remove collected washing liquid. In particular, it is conceivable that the Schmutzaustragpumpe 74 about the already mentioned control 100 depending on the amount of in the dirt collecting area 71 collected dirt particles is driven.

Nevertheless, it is of course conceivable that the pumping of dirt from the dirt collecting area 71 depending, for example, on the level in the dirt collecting area 71 , the level in the wash tank 14 , or other factors.

Comes the dirt trap system 70 in a conveyor dishwasher 50 used (cf., for example 1 to 4 ), it is also conceivable that the Schmutzaustragpumpe 74 For example, depending on the transport speed at which the items to be washed through the treatment zones of the conveyor dishwasher 50 is transported, or, for example, depending on the amount of final rinse liquid in the final rinse 54 is sprayed per unit time is activated.

Of course, a dirt discharge not only take place at the beginning of each washing cycle S3, but also at the end or middle. It is essential that there is a cyclical repetition of the discharge in order to achieve a uniformly high rinsing quality.

The invention is not limited to the embodiments described in connection with the drawings.

So it is conceivable, for example, that the Tankabdecksieb 20 . 20-1 the dirt collecting system 70 not a substantially centrally located feed opening 22 over which the with the help of Tankabdecksiebes 20 . 20-1 separated dirt particles in the dirt collecting area 71 . 71-1 reach. Rather, this feed opening 22 Also be designed as a gap, which at an edge region of the Tankabdecksiebes 20 . 20-1 is provided.

Furthermore, it is basically conceivable that the feed opening 22 is covered with the aid of a coarse sieve, said coarse sieve should preferably have a mesh size which is greater than the mesh size of the Tankabdecksiebes 20 . 20-1 is. By providing such Grobsiebes can be effectively prevented, for example, cutlery or other utensils other than dirty water particles accidentally in the dirt collection area 71 . 71-1 reach.

Claims (25)

Dishwasher, in particular commercial dishwashing or utensil dishwasher, which can be used as a programmer or as a conveyor dishwasher ( 50 ), wherein the dishwasher has at least one washing system designed as a recirculation circuit, wherein the at least one washing system has a nozzle system with at least one washing nozzle ( 13 ; 13-1 ) for spraying washing liquid onto the items to be cleaned, a wash tank ( 14 ; 14-1 ) for collecting at least part of the sprayed washing liquid and a washing pump ( 11 ; 11-1 ) for feeding in the wash tank ( 14 ; 14-1 ) collected washing liquid to the at least one washing nozzle ( 13 ; 13-1 ), wherein one of the at least one washing system associated with dirt collection system ( 70 ), which is designed to remove dirt particles from the sprayed and by gravity in the wash tank ( 14 ; 14-1 ) to separate back flowing washing liquid, and wherein a suction side with the dirt collecting system ( 70 ) and pressure side with a Schmutzaustragrohrsystem ( 72 . 73 ; 72-1 . 73-1 ) connected or connectable Schmutzaustragpumpe ( 74 ; 74-1 ) is provided for on-demand discharge of at least a part of the dirt collecting system ( 70 ) separated from the washing liquid dirt particles, characterized in that the dishwasher further comprises a suction side with the wash tank ( 14 ; 14-1 ) and pressure side with a sewer pipe system ( 41 ) connected or connectable wastewater pump ( 40 ) has as needed pumping off at least part of the in the wash tank ( 14 ; 14-1 ) collected washing liquid. Dishwasher according to claim 1, wherein the dirt collecting system ( 70 ) a tank cover screen ( 20 ; 20-1 ) and a dirt collecting area ( 71 ) for collecting with the help of Tankabdecksiebes ( 20 ; 20-1 ) has separated from the washing liquid dirt particles, wherein the dirt collecting area ( 71 ) is open at the top, but completely closed at the sides, and the dirt discharge pipe system ( 72 . 73 ; 72-1 . 73-1 ) with the dirt collecting area ( 71 ) is connected or connectable. Dishwasher according to claim 2, wherein the Tankabdecksieb ( 20 ; 20-1 ) above the dirt collecting area ( 71 ) is arranged and a drainage slope in the direction of a feed opening ( 22 ), wherein the upwardly open formed dirt collecting area ( 71 ) below the feed opening ( 22 ) is arranged such that by means of Tankabdecksiebes ( 20 ; 20-1 ) separated dirt particles via the feed opening ( 22 ) in the dirt collecting area ( 71 ) reach. Dishwasher according to claim 3, wherein the cover screen ( 20 ; 20-1 ) is at least partially funnel-shaped, and wherein the feed opening ( 22 ) within the funnel-shaped area ( 21 ) of Tankabdecksiebes ( 20 ; 20-1 ), and preferably in the tapered region of the funnel-shaped region (FIG. 21 ) of Tankabdecksiebes ( 20 ; 20-2 ), is trained. Dishwasher according to claim 3 or 4, wherein the feed opening ( 22 ) in a central position of Tankabdecksiebes ( 20 ; 20-1 ) is trained. Dishwasher according to one of claims 3 to 5, wherein further a Grobsiebieb is provided, which at least partially the feed opening ( 22 ) and has a mesh size which is greater than the mesh size of Tankabdecksiebes ( 20 ; 20-1 ). Dishwasher according to one of claims 1 to 6, wherein the sewage pipe system ( 41 ) with an on-site sewer network and the dirt discharge pipe system ( 72 . 73 ; 72-1 . 73-1 ) with an externally formed by the washing system dirt collecting container ( 80 ) or with a waste disposal system formed externally of the dishwasher ( 82 ) is connected or connectable. Dishwasher according to one of claims 1 to 7, further comprising means ( 42 ) is provided for determining the degree of contamination of the washing liquid. Dishwasher according to claim 8, wherein the device ( 42 ) for determining the degree of soiling of the washing liquid has at least one turbidity sensor, which is arranged and designed in such a way, when pumping washing liquid out of the washing tank ( 14 ; 14-1 ) the degree of contamination of the wastewater piping system ( 41 ) to determine flowing washing liquid. Dishwasher according to one of claims 1 to 9, wherein further comprises a control device ( 100 ) is provided, which is formed, optionally the washing pump ( 11 ; 11-1 ), the dirt discharge pump ( 74 ; 74-1 ) and the wastewater pump ( 40 ) in a coordinated manner, in such a way that during a prewash phase with the aid of the washing pump ( 11 ; 11-1 ) at least a portion of the in the wash tank ( 14 ; 14-1 ) collected washing liquid of the at least one washing nozzle ( 13 . 13-1 ) is supplied; That during a dirt discharge phase with the aid of the dirt discharge pump ( 74 ; 74-1 ) at least part of the dirt collecting system ( 70 ) separated from the washing liquid dirt particles the Schmutzaustragrohrsystem ( 72 . 73 ; 72-1 . 73-1 ) is supplied; During a main wash phase with the aid of the wash pump ( 11 ; 11-1 ) at least a portion of the in the wash tank ( 14 ; 14-1 ) collected washing liquid of the at least one washing nozzle ( 13 ; 13-1 ) is supplied; and - during a pumping-down phase using the wastewater pump ( 40 ) at least a portion of the in the wash tank ( 14 ; 14-1 ) collected washing liquid the sewer pipe system ( 41 ) is supplied. Dishwasher according to claim 10, wherein the control device ( 100 ), the dirt discharge pump ( 74 ; 74-1 ) during the prewash phase or after completion of the prewash phase, and preferably after a time delay after completion of the prewash phase, but before the start of the main wash phase. Dishwasher according to claim 10 or 11, wherein the control device ( 100 ), the wastewater pump ( 40 ) after completion of the main wash phase. Dishwasher according to one of claims 10 to 12, wherein the control device ( 100 ) is formed, depending on the degree of contamination of the washing liquid, the wastewater pump ( 40 ) head for. Dishwasher according to claim 13, wherein the length of the pumping down phase during which the wastewater pump ( 40 ) from the control device ( 100 ), depends on the degree of contamination of the washing liquid. Dishwasher according to one of claims 10 to 14, wherein the control device ( 100 ), the dirt discharge pump ( 74 ; 74-1 ) depending on the amount of dirt collecting system ( 70 ) to control separated from the washing liquid dirt particles. Dishwasher according to one of claims 1 to 15, wherein the dishwasher as a conveyor dishwasher ( 50 ), wherein the transport dishwasher ( 50 ) at least one washing zone ( 51 . 52 ) and at least one final rinse zone ( 54 ) such as a transport device ( 58 ) for transporting the items to be cleaned through the at least one washing zone ( 51 . 52 ) and the at least one washing zone ( 51 . 52 ) in the transport direction (T) of the wash ware downstream final rinse zone ( 54 ), wherein the washing system of the at least one washing zone ( 51 . 52 ) assigned. Dishwasher according to one of claims 1 to 15, wherein the dishwasher is designed as a programmer and has a treatment chamber, wherein the washing system is associated with the treatment chamber. Dishwasher according to claim 17, further comprising a rinsing system with at least one rinse pump ( 44 ) and a rinse nozzle system arranged in the treatment chamber ( 49 ) is provided to spray rinse, in particular fresh water, in the treatment chamber during a final rinse phase. Dishwasher according to claim 18, wherein the sprayed amount of final rinse liquid is controlled depending on the degree of contamination of the washing liquid. Dishwasher according to claim 17 or 18, wherein the amount of rinsing liquid sprayed during the rinse phase in the treatment chamber depends on the amount of during a Abpumphase by means of the waste water pump ( 40 ) from your wash tank ( 14 ; 14-1 ) discharged washing liquid. Method for operating a dishwasher according to one of Claims 1 to 20, the method comprising the following method steps i) during a prewash phase, the washing pump ( 11 ; 11-1 ) are controlled in such a way that at least a part of the in the wash tank ( 14 ; 14-1 ) collected washing liquid of the at least one washing nozzle ( 13 ; 13-1 ) is supplied for pre-washing dishes; ii) during a dirt discharge phase, the soil discharge pump ( 74 ; 74-1 ) are controlled in such a way that at least a part of the dirt collecting system ( 70 ) separated from the washing liquid dirt particles the Schmutzaustragrohrsystem ( 72 . 73 ; 72-1 . 73-1 ) is supplied for discharging dirt particles from the treatment zone or treatment chamber of the dishwasher; iii) during a main wash phase, the wash pump ( 11 ; 11-1 ) are controlled in such a way that at least a part of the in the wash tank ( 14 ; 14-1 ) collected washing liquid of the at least one washing nozzle ( 13 ; 13-1 ) is supplied to the main wash of the dishes; and iv) during a pump-down phase, the wastewater pump ( 40 ) are controlled in such a way that at least a part of the in the wash tank ( 14 ; 14-1 ) collected washing liquid the sewer system ( 41 ) is supplied. A method according to claim 21, wherein the method step ii) after completion of the method step i), and preferably with a time delay after completion of the method step i), but before the start of method step iii) is performed. The method of claim 21 or 22, wherein the method step iv) after completion of the method step iii) is performed. Process according to one of Claims 21 to 23, in which in the process step iv) the waste water pipe system ( 41 ) supplied washing liquid, the degree of contamination of the washing liquid is determined. The process according to claim 24, wherein the process further comprises the following process step after process step iv). V) during a final rinse phase, with at least one rinse aid ( 44 ) Rinse liquid to a rinse aid system ( 49 ) supplied for rinsing the items to be washed.

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