Warewashing machine with soil evacuation system

Abstract

A warewashing machine comprises at least one washing system (51, 52) and a dirt capture system (70). The dirt capture system has a tank cover filter (20; 20-1, 20-2) configured to separate dirt particles from sprayed washing liquid flowing back into the washing tank (14; 14-1, 14-2) due to gravity. The dirt capture system comprises a dirt collection area (71) arranged at least partially in the washing tank and open upwards to collect the dirt particles separated from the washing liquid by the tank cover filter. A dirt evacuation system fluidly connected to the dirt collection area comprises a dirt evacuation piping system (72; 72-1, 72-2) for evacuating the dirt collection area when needed. The dirt collection area comprises a pressure equalization system (90) for equalizing a negative pressure locally formed in the dirt collection area when the dirt collection area is evacuated.

Description

Technical Field

[0001] The present invention specifically relates to a commercial dishwashing machine for washing tableware or utensils, which is configured as a box-type dishwashing machine or a conveyor-type dishwashing machine.

[0002] Therefore, the present invention relates to a dishwashing machine comprising at least one washing zone configured as a recirculation loop. The washing zone configured as a recirculation loop comprises: a nozzle system having at least one washing nozzle for spraying washing liquid onto dishes to be washed; a washing tank for capturing at least a portion of the sprayed washing liquid; and a washing pump for supplying the washing liquid collected in the washing tank to the at least one washing nozzle. Additionally, the dishwashing machine includes a dirt trapping system associated with the at least one washing zone, and the dirt trapping system has at least one tank cover filter for separating dirt particles from the sprayed washing liquid that flows back into the washing tank due to gravity. Background Technology

[0003] A bin washer is a dishwashing machine that can be manually loaded and unloaded. A bin washer (or “volume dishwasher”) can be a shelf-type push-through dishwashing machine (also called a hood-type dishwashing machine) or a front-loading machine (“front-loading dishwashing machine”). A front-loading machine can be an under-counter machine, a countertop machine, or a freestanding dishwashing machine with front loading (“freestanding front-loading machine”).

[0004] A dishwashing machine configured as a box-type dishwashing machine typically includes a treatment chamber for washing the dishes. Typically, a washing tank is located below the treatment chamber, and liquid can flow back from the treatment chamber into the washing tank due to gravity. The washing tank contains a washing liquid (usually water), to which a cleaning agent can be supplied where appropriate.

[0005] The dishwashing machine configured as a box-type dishwashing machine also includes a washing system having a washing pump, a piping system connected to the washing pump, and a nozzle system (the nozzle system having at least one washing nozzle). Washing liquid in the washing tank can be delivered by the washing pump via the piping system to at least one washing nozzle, and sprayed onto the dishes to be washed through the at least one washing nozzle in the processing chamber. The sprayed washing liquid then flows back into the washing tank due to gravity.

[0006] Specifically, conveyor-type dishwashing machines are either long-line dishwashing machines or shelf-type conveyor-type dishwashing machines. Conveyor-type dishwashing machines are commonly used in the commercial sector. Compared to box-type dishwashing machines (where the dishes to be washed remain in a fixed position within the machine during washing), in conveyor-type dishwashing machines, the dishes are conveyed through different processing zones.

[0007] Conveyor-type dishwashing machines typically include at least one pre-wash zone and at least one main wash zone, which is located downstream of the pre-wash zone(s) as viewed along the conveyor direction. Downstream of the main wash zone(s) is typically at least one post-wash zone or pre-rinse zone and at least one final rinse zone connected downstream of the post-wash zone(s). Dishwashing vessels received directly on the conveyor belt or held by shelves typically travel along the conveyor direction through an inlet passage, followed by the pre-wash zone(s), main wash zone(s), post-wash zone(s), final rinse zone(s), and drying zone before entering the outlet section.

[0008] Each washing zone of the conveyor-type dishwashing machine has an associated washing system, which includes a washing pump and a piping system (washing piping system) connected to the washing pump. Washing liquid is supplied through this piping system to a nozzle system or to at least one washing nozzle of the nozzle system. The washing liquid supplied to at least one washing nozzle of the nozzle system is sprayed onto the dishes being washed in the respective washing zone of the conveyor-type dishwashing machine, which are being conveyed through the respective washing zone by the conveyor device of the conveyor-type dishwashing machine. Each washing zone has an associated tank in which the liquid sprayed through the washing nozzles is received, and / or in which liquid for the nozzle system of the respective treatment zone is provided.

[0009] In conveyor-type dishwashing machines commonly known in the prior art, a final rinse liquid in the form of clean water (which may be pure or mixed with other additives (such as rinsing aids)) is sprayed onto the dishes through spray nozzles in the final rinse zone. At least a portion of the sprayed final rinse liquid is conveyed from one zone to another via a cascade system in the opposite direction to the conveying direction of the dishes.

[0010] The final rinse liquid sprayed is captured in the tank of the post-wash zone (post-wash tank), and the captured liquid is delivered from this tank to the spray nozzles (post-wash nozzles) of the post-wash zone by a wash pump belonging to the wash system of the post-wash zone. The wash liquid is rinsed off the dishes in the post-wash zone. The liquid present here flows into the wash tank of at least one main wash zone, which is connected upstream of the post-wash zone if viewed along the conveying direction of the dishes. Here, the liquid is typically provided with detergent and is sprayed onto the dishes through the nozzles (wash nozzles) of the main wash zone by means of a pump system (wash pump) belonging to the wash system of the main wash zone. Subsequently, if no additional main wash zone is provided, the wash liquid flows from the wash tank of the main wash zone into the pre-wash tank of the pre-wash zone. The liquid in the pre-wash tank is sprayed onto the dishes through the pre-wash nozzles of the pre-wash zone by a pump system (pre-wash pump) belonging to the wash system of the pre-wash zone to remove coarse impurities from the dishes.

[0011] Dishwashers are typically equipped with a wash pump that supplies the final rinse liquid to the piping system in the final rinse zone. This ensures, in particular, that the volumetric flow rate of the final rinse liquid in the final rinse zone remains almost constant. However, it is also conceivable to utilize the on-site piping pressure (e.g., the pressure of the clean water supply unit) to conduct the final rinse liquid to the piping system in the final rinse zone. In this last case, an actuable valve can be installed between the piping system in the final rinse zone and the spray nozzles to allow for intermittent or complete interruption of the supply of the final rinse liquid to the spray nozzles.

[0012] Whether a dishwashing machine is configured as a box-type dishwashing machine or a conveyor-type dishwashing machine, a commercial dishwashing machine for washing tableware therefore typically includes at least one washing zone configured as a recirculation loop, and the at least one washing zone includes: a nozzle system having at least one washing nozzle for spraying washing liquid onto the dishes to be washed; a washing tank for capturing at least a portion of the sprayed washing liquid; and a washing pump for supplying the liquid collected in the washing tank to the at least one washing nozzle.

[0013] Because the washing zone, configured as a recirculation loop, is used to wash dishes, at least a portion of the washing liquid sprayed into the washing zone is guided within the loop. This presents the risk that, due to the permanent circulation of the washing liquid, dirt particles removed from the dishes are repeatedly broken down and may no longer be easily separated from the washing liquid by filters or similar devices. Consequently, for washing zones configured as recirculation loops, the risk of contamination of the washing liquid with dirt increases with washing time, resulting in a greater risk of recontamination of the dishes and an overall deterioration in washing performance.

[0014] This problem occurs particularly in the pre-wash or main wash zones of dishwashing machines configured as conveyor-type dishwashers. Because the washing liquid used in a conveyor-type dishwasher flows in a cascaded manner in the opposite direction to the conveying direction of the dishes to be washed, the dirt concentration in the washing liquid in at least one pre-wash zone is the highest compared to the dirt concentration in the washing liquid in the remaining treatment zones. This is because the pre-wash zone is where the most dirt is found.

[0015] On the other hand, it is inevitable that during the operation of a dishwashing machine configured as a conveyor type, a portion of the heavily contaminated wash liquid in the pre-wash zone is "carried" through the conveying of the dishes into at least one main wash zone connected downstream of the pre-wash zone. This causes the wash liquid in the main wash zone to become more contaminated with dirt, and therefore the washing effect in the main wash zone may also deteriorate.

[0016] To separate dirt particles introduced into a dishwashing machine from the washing liquid used to wash the dishes, it is generally known to use a filter device in the form of a dirt filter basket (in which dirt particles introduced into the dishwashing machine are collected). In the case of a dishwashing machine configured as a box-type dishwashing machine, this dirt filter basket is usually arranged in the storage tank of the processing chamber, above the washing tank.

[0017] On the other hand, regarding a dishwashing machine configured as a conveyor type, it is known that at least a pre-washing tank (associated with a pre-washing zone) and preferably a main washing tank (associated with at least one main washing zone) are equipped with a flat filter and a dirt filter basket.

[0018] During operation of the dishwashing machine (configured as a box-type dishwashing machine or a conveyor-type dishwashing machine), dirt particles washed off the dishes by means of circulating wash water then fall onto a flat filter due to gravity. At this flat filter, the dirt particles are separated from the wash liquid flowing back into the corresponding washing tank. The separated dirt particles are then typically sieved in a dirt filter basket.

[0019] The present invention addresses the following problem: Existing solutions known to date (where dirt particles are separated from the circulating wash liquid using a flat filter or dirt filter basket) carry the risk that dirt particles accumulating on the flat filter or in the dirt filter basket are broken down to a certain extent due to the continuous circulation of the wash liquid. As the washing time increases, the particle size of the dirt particles is no longer covered by the sieve size of the flat filter or dirt filter basket. Therefore, despite the provision of a flat filter or dirt filter basket, the continuous accumulation of dirt particles in the wash liquid with increasing washing time can no longer be prevented.

[0020] Against this backdrop, document DE 10 2009 048 810 A1 discloses that at least one washing area of ​​a dishwashing machine is equipped with a dirt capture system, which includes a tank cover filter for separating dirt particles from the sprayed washing liquid that flows back into the washing tank (configured as a recirculation loop) due to gravity. The dirt capture system known from this prior art includes a dirt collection area in which dirt particles separated from the washing liquid by means of the tank cover filter are collected. The dirt collection area is fluidly connected to a dirt discharge piping system, allowing the dirt particles collected in the dirt collection area of ​​the dirt capture system to be removed when necessary by means of a dirt discharge pump.

[0021] However, the dirt capture systems known from document DE 10 2009 048 810 A1 have drawbacks in practical use, particularly concerning the actual dirt removal capacity achieved during dishwasher operation. It has been found that in order to empty the dirt collection area, the dirt removal pump must operate continuously for a relatively long period. During this period, the recirculation of the washing liquid in the washing zone should also be interrupted. However, this results in continuous rinsing or washing operations being affected by the conventional dirt removal system. In particular, the dirt removal systems known from DE 10 2009 048 810 A1 lead to extended program cycles, which is generally unacceptable to dishwasher operators, or result in a reduction in the number of dishes washed per unit time. Summary of the Invention

[0022] Therefore, starting from the dirt capture system known (at least in principle) from DE 10 2009 048 810 A1, the present invention aims to further develop the dirt capture system so that (in an effective but easily implementable manner) on the one hand, the risk of recontamination of the washing vessel can be reduced and the overall washing effect can be improved, and on the other hand, the operation of the washing vessel, especially its washing capacity, is not adversely affected.

[0023] According to the present invention, the objective is achieved because, in the type of dishwashing machine mentioned in the introduction, a dirt-capturing system associated with at least one washing system of the dishwashing machine is provided, wherein the dirt-capturing system has an associated tank cover filter configured to separate dirt particles from the sprayed washing liquid that flows back into the washing tank due to gravity. Similar to the dirt-capturing systems known from document DE 10 2010 063 711 A1, the dirt-capturing system according to the present invention includes a dirt collection area, which is at least partially arranged in the washing tank and open upwards, and is used to collect dirt particles separated from the washing liquid by means of the tank cover filter.

[0024] Furthermore, in the solution according to the invention, the dirt discharge system fluidly connected to the dirt collection area is provided with a dirt discharge pipeline system, by means of which the dirt collection area can be emptied when needed.

[0025] A key feature of the solution according to the invention is that the dirt collection area of ​​the dirt capture system has an associated pressure equalization system, which is used to equalize the negative pressure locally formed in the dirt collection area when the dirt collection area is emptied.

[0026] The advantages of the solution according to the invention are obvious: the dirt collection area has an associated pressure equalization system for equalizing the negative pressure locally formed in the dirt collection area when it is emptied, thus shortening the time required for the process of emptying the dirt collection area, particularly for this purpose, compared to dirt capture systems with dirt collection areas as known from document DE 10 2010 063 711 A1. It has been recognized here that, by means of the pressure equalization system, not only can the negative pressure locally formed in the dirt collection area be reduced or equalized, but also a vortex is formed in the dirt collection area when it is emptied, through which the washing liquid loaded with dirt particles rotates, thereby significantly accelerating the emptying of the dirt collection area.

[0027] Therefore, during continuous operation of washing dishes, the dirt can be periodically removed without extending the running time of the dishwashing machine for this purpose. Thus, not only is the risk of recontamination of the dishes reduced (because the quality of the washing liquid is optimized due to the periodic removal of dirt), but the capacity of the dishwashing machine is not adversely affected.

[0028] There are several possibilities for implementing a pressure equalization system. In particular, it is advantageous that the pressure equalization system is at least partially configured in the sidewall of the dirt collection area. In this case, the pressure equalization system may include, for example, a flexible wall region that deforms during the emptying process of the dirt collection area to enter the dirt collection area, so as to equalize the negative pressure locally formed in the dirt collection area when the dirt collection area is emptied.

[0029] However, advantageously, the pressure equalization system includes wall regions that are permeable to the washing liquid and preferably impermeable to dirt particles, such as filters, particularly fine screen filters. Alternatively, slit-like or dot-like openings are also conceivable. Preferably, the permeable wall regions or filters and / or slit-like or dot-like openings are formed along the periphery of the sidewalls of the dirt collection area in such a way that they promote the formation of eddies in the dirt collection area when the dirt collection area is emptied.

[0030] According to an embodiment of the dishwashing machine of the present invention, the dirt discharge system includes a dirt discharge pump, the suction side of which is fluidly connected or fluidly accessible to the dirt collection area. As an alternative to the dirt discharge pump, it is also conceivable to provide an actuable valve in the dirt discharge piping system such that the dirt collection area can be emptied by gravity when needed (specifically, when the valve is open). However, since the time required to empty the dirt collection area can be significantly reduced by using a dirt discharge pump, providing such a dirt discharge pump is preferred.

[0031] On the other hand, if a dirt discharge pump is used, it must be ensured that what is actually removed by the dirt discharge pump is essentially only the washing liquid loaded with dirt particles and collected in the dirt collection area. For this purpose, according to embodiments of the invention, a pressure equalization system is provided in the sidewall of the dirt collection area between the connector and the opposite upper region of the dirt collection area, by means of which the dirt collection area is fluidly connected or fluidly accessible to the dirt discharge piping system. In particular, in this case, the pressure equalization system should be located, as far as possible, in the central or upper region of the dirt collection area. Particularly effective is that the pressure equalization system is located in a region of the sidewall of the dirt collection area that is above 30% of the length measured from the connector to the upper region of the dirt collection area.

[0032] The capacity of the dirt collection area should be at least 0.5 L and at most 3.0 L. Preferably, the capacity of the dirt collection area is in the range of 1.0 L and 2.0 L. This involves a trade-off, where both the time required to empty the dirt collection area and the frequency of the emptying process need to be considered.

[0033] Furthermore, according to the present invention, the effective diameters of the dirt discharge piping system and the suction-side inlet and pressure-side outlet of the dirt discharge pump are larger than the effective diameters of the washing pumps used in dishwashing machines, specifically at least 5 cm. This also has a positive impact on the time required to empty the dirt collection area.

[0034] The pressure equalization system allows the dirt collection area to be emptied in a very short time. In particular, this allows the solution according to the invention to use a dirt discharge pump with a pump capacity of at least 100 l per minute, and preferably at least 110 l per minute.

[0035] In particular, the solution according to the invention provides an efficient method for removing dirt particles from the washing liquid, enabling a longer service life of the washing liquid compared to conventional solutions. In this way, the washing liquid can be used for more washing cycles before it needs to be replaced. This significantly saves on clean water, detergent, and heating energy.

[0036] Preferably, the dirt discharge pump is designed to continuously or at a given time and / or event remove dirt particles collected in the dirt collection area from the washing area.

[0037] Therefore, the solution according to the invention allows for the automatic removal of dirt particles collected in at least one washing zone of the dishwashing machine by means of a dirt capture system. This automatic dirt removal reduces the stress on the operator of the dishwashing machine. Furthermore, it effectively prevents the overfilling of the dirt collection zone from affecting or clogging the recirculation of the washing liquid within the washing zone. Attached Figure Description

[0038] Exemplary embodiments of the solutions according to the present invention will be described in more detail below with reference to the accompanying drawings.

[0039] In the attached diagram:

[0040] Figure 1 A dishwashing machine configured as a conveyor-type dishwashing machine according to a first embodiment of the present invention is shown schematically.

[0041] Figure 2 A dishwashing machine configured as a conveyor-type dishwashing machine according to a second embodiment of the present invention is shown schematically.

[0042] Figure 3 A dishwashing machine configured as a conveyor-type dishwashing machine according to a third embodiment of the present invention is illustrated schematically; and

[0043] Figure 4 The washing tank of the washing area of ​​a dishwashing machine is schematically shown in an embodiment of a conveyor-type dishwashing machine or a box-type dishwashing machine with a dirt capture system. Detailed Implementation

[0044] Figure 1 An example of a conveyor-type dishwashing machine 50 with a teaching configuration according to the present invention is shown in a schematic longitudinal sectional view. Figure 1 The illustrated conveyor-type dishwashing machine 50 includes a pre-wash zone 51 and a main wash zone 52, the main wash zone (e.g., along the dishwashing area) Figure 1 (Not shown) The conveyor direction T is located downstream of the pre-washing area 51. Viewed along the conveyor direction T, in... Figure 1 In the conveyor-type dishwashing machine 50 shown, a post-wash or pre-rinse zone 53 and a final rinse zone 54 are arranged downstream of the main wash zone 52, with the final rinse zone connected downstream of the post-wash or pre-rinse zone 53. Dishwashers (either directly received on the conveyor belt 58 or held by shelves) travel along the conveyor direction T through the inlet passage 55, followed by the pre-wash zone 51, the main wash zone 52, the post-wash zone 53, the final rinse zone 54, and the drying zone 56 before entering the outlet section 57.

[0045] The processing zones 51, 52, 53, and 54 of the conveyor-type dishwashing machine 50 each have associated spray nozzles 13-1, 13-2, 13-3, and 13-4 through which liquid is sprayed onto the dishes being conveyed by the conveyor belt 58 through the respective processing zones 51, 52, 53, and 54. At least the pre-wash zone 51, the main wash zone 52, and the post-wash or pre-rinse zone 53 each have associated tanks (washing tanks 14-1, 14-2, and 14-3) in which the sprayed washing liquid is received, and / or in which the washing liquid for the spray nozzles 13-1, 13-2, and 13-3 of the respective zones 51, 52, and 53 is provided.

[0046] Figure 1The conveyor-type dishwashing machine 50 shown according to a first embodiment of the present invention includes a pre-washing zone 51, a main washing zone 52, and a post-washing zone 53, each comprising washing systems 10-1, 10-2, 10,3. Each washing system 10-1, 10-2, 10-3 includes: washing pumps 11-1, 11-2, 11-3; piping systems 12-1, 12-2, 12-3 (connected to washing pumps 11-1, 11-2, 11-3); and spray nozzles 13-1, 13-2, 13-3 (connected to piping systems 12-1, 12-2, 12-3).

[0047] In addition, a control device 100 (schematically shown in the accompanying drawings) is provided, which is particularly used to actuate the respective washing pumps 11-1, 11-2, 11-3 of the washing systems 10-1, 10-2, 10-3 in an appropriate manner during the washing process, so as to supply washing liquid at least intermittently through the associated piping systems 12-1, 12-2, 12-3 to the spray nozzles 13-1, 13-2, 13-3 of the nozzle systems associated with the respective washing systems 10-1, 10-2, 10-3.

[0048] exist Figure 1 In the conveyor-type dishwashing machine 50 shown, the final rinse liquid in the form of clean water (which can be mixed with other chemical additives (such as rinsing aids)) is sprayed onto the dishes through spray nozzles 13-4 arranged above and below the conveyor belt 58 in the final rinse zone 54. Figure 1 (Not shown) Above. For example... Figure 1 As shown, the final rinsing zone 54 may also be equipped with laterally arranged spray nozzles 13-5.

[0049] A portion of the final rinse liquid sprayed in the final rinse zone 54 is transferred from one zone to another via a cascade system in the opposite direction to the conveying direction T of the washers. The remaining portion of the final rinse liquid is directly transferred to the pre-wash tank 14-1 in the pre-wash zone 51 via valve 59 and bypass line 60.

[0050] The final rinse liquid sprayed in the final rinse zone 54 is captured in the tank (post-wash or pre-wash tank 14-3) of the post-wash or pre-wash zone 53. The captured liquid is delivered from the tank to the spray nozzle 13-3 (post-wash or pre-wash nozzle) of the post-wash or pre-wash zone 53 by the wash pump 11-3 of the wash system 10-3 belonging to the post-wash or pre-wash zone 53. The wash liquid is then rinsed off the dishes in the post-wash or pre-wash zone 53.

[0051] The liquid that appears here flows into the washing tank 14-2 of the main washing area 52, which is usually provided with chemical cleaning agent, and is sprayed onto the dishes by means of the washing pump 11-2 of the washing system 10-2 belonging to the main washing area 52 and through the spray nozzle 13-2 (wash nozzle) of the washing system 10-2 belonging to the main washing area 52.

[0052] Subsequently, the washing liquid flows from the washing tank 14-2 of the main washing zone 52 into the pre-washing tank 14-1 of the pre-washing zone 51. In the pre-washing zone 51, the washing liquid collected in the pre-washing tank 14-1 is sprayed onto the dishes by means of the washing pump 11-1 of the washing system 10-1 belonging to the pre-washing zone 51 and through the spray nozzle 13-1 (pre-wash nozzle) of the washing system 10-1 belonging to the pre-washing zone 51, so as to remove coarse impurities from the dishes.

[0053] exist Figure 1 In the conveyor-type dishwashing machine 50 shown, the main washing zone 52 includes a tank cover filter 20-2 arranged above the main washing tub 14-2. During operation of the conveyor-type dishwashing machine 50, washing liquid is sprayed onto the dishes through the spray nozzles 13-2 (wash nozzles) of the washing system 10-2. The sprayed washing liquid flows back into the washing tub 14-2 of the main washing zone 52 due to gravity, wherein dirt particles rinsed off from the dishes in the main washing zone 52 are retained by the tank cover filter 20-2, provided that these dirt particles are larger than the mesh size of the tank cover filter 20-2. Preferably, the mesh size of the tank cover filter 20-2 is approximately 1 mm to 4 mm.

[0054] exist Figure 1 In the schematically shown conveyor-type dishwashing machine 50, the rinsing operation must be interrupted for the purpose of cleaning the tank cover filter 20-2 so that manual cleaning of the tank cover filter 20-2 can be allowed.

[0055] A portion of the washing liquid sprayed in the main washing zone 52 flows through the overflow system 61 into the washing tank (pre-wash tank 14-1) of the pre-wash zone 51. Like the main washing zone 52, the pre-wash zone 51 is also equipped with a tank cover filter 20-1, which is configured as a flat filter. The tank cover filter 20-1 is positioned above the washing tank (pre-wash tank 14-1) of the pre-wash zone 51 to separate dirt particles from the washing liquid that has been sprayed into the pre-wash zone 51 and flows back into the pre-wash tank 14-1 due to gravity. Preferably, the mesh size of the tank cover filter 20-1 is in the range of approximately 1 mm to 4 mm.

[0056] Because (as explained in the introduction) the concentration of dirt in the washing liquid is highest in the pre-wash zone 51 (since this is where the most dirt appears), therefore Figure 1 The conveyor-type dishwashing machine 50 shown is equipped with a dirt capture system 70, which is associated with a pre-wash zone 51 and includes a dirt collection area 71-1 arranged in the pre-wash zone 51, and particularly in the pre-wash tank 14-1. Reference will be made below. Figure 4 The illustrations in the diagrams describe this in more detail. Figure 1 The structure and function of the dirt capture system 70 used in the conveyor-type dishwashing machine 50 shown.

[0057] exist Figure 1 In the embodiment of the conveyor-type dishwashing machine 50 shown, the dirt collection area 71 is used to collect dirt particles separated from the washing liquid by means of the tank cover filter 20-1. Specifically, and as referenced below... Figure 4 As illustrated in more detail in the diagram, the dirt collection area 71-1 is configured as a chamber within the pre-wash tank 14-1, open to the top and including a pressure equalization system on its side. Dirt particles separated by the tank cover filter 20-1 can enter the chamber-like dirt collection area 71-1 through the top opening. The fact that the dirt collection area 71 includes a pressure equalization system on its side means that particularly rapid emptying of the dirt collection area 71 is possible.

[0058] Specifically, and as referenced below Figure 4 As described in more detail in the illustration, preferably, the tank cover filter 20-1 is arranged above the dirt collection area 71-1 and includes a drainage slope in the form of an incline guiding toward the supply opening 22, wherein the upwardly open dirt collection area 71-1 is arranged below the supply opening 22 in such a way that dirt particles separated by means of the tank cover filter 20-1 can enter the dirt collection area 71-1 through the supply opening 22.

[0059] Here, it is particularly conceivable that the trough cover filter 20-1 is configured at least partially in a funnel shape, wherein the supply opening 22 is disposed inside the funnel-shaped region 21 of the trough cover filter 20-1, and preferably disposed at the apex of the funnel-shaped region 21 of the trough cover filter 20-1 (see also, in this respect, the reference is particularly significant). Figure 4 (Illustration in the image).

[0060] Figure 1The dirt capture system 70 used in the illustrated embodiment also includes a dirt discharge piping system connected to a dirt collection area 71-1. This dirt discharge piping system includes a vertical pipe 72-1 and a wastewater line 73-1, and is used to discharge dirt particles collected in the dirt collection area 71-1 from the pre-washing area 51. As shown, a dirt discharge pump 74-1 is arranged in the dirt discharge piping systems 72-1 and 73-1. The inlet of the dirt discharge pump 74-1 on the suction side is connected to the lower region of the dirt collection area 71-1 via the vertical pipe 72-1 belonging to the dirt discharge piping system. The outlet of the dirt discharge pump 74-1 on the pressure side leads to the wastewater line 73-1 belonging to the dirt discharge piping system.

[0061] exist Figure 1 In the illustrated embodiment, wastewater line 73-1 leads to an external dirt capture container 80, which is located outside the pre-washing area 51, upstream of the inlet channel 55 of the conveyor-type dishwashing machine 50. Preferably, this external dirt capture container 80 includes a filter and a connection 81 to the wastewater system.

[0062] Since it is impossible to prevent a portion of the sprayed washing liquid from entering the dirt collection area 71 when the washing liquid is sprayed in the pre-wash zone 51, not only are dirt particles separated by the tank cover filter 20-1 delivered from the pre-wash zone 51 by the dirt discharge pump 74-1, but a portion of the washing liquid is also delivered from the pre-wash zone by the dirt discharge pump. The material (dirt particles and washing liquid) removed from the dirt collection area 71-1 is filtered in the dirt capture container 80, wherein the liquid component (washing liquid) can be supplied to the wastewater system through the outflow connection 81, and the remaining solids (dirt particles) in the dirt capture container 80 can be subsequently disposed of.

[0063] like Figure 2 What is shown is, as Figure 1 Alternatives to the illustrated embodiments may include pumping the dirt particles along with the wastewater out of the pre-washing zone 51 and into a waste treatment system 82, which may be positioned either directly adjacent to or further away from the conveyor-type dishwashing machine 50. Extrusion systems and / or pulverizing systems (grinding systems, shredding systems, etc.) for separating solids from liquids may be used as waste treatment system 82.

[0064] Preferably, the material (dirt particles and washing liquid) removed from the dirt collection area 71-1 is also filtered in the waste treatment system 82, wherein the liquid component (washing liquid) can be supplied to the wastewater system through the outflow connector 83, and the remaining solids (dirt particles) in the waste treatment system 82 can be subsequently disposed of.

[0065] According to an embodiment of the solution of the present invention, it is proposed to supply the material (dirt particles and washing liquid) removed from the dirt collection area 71-1 to a heat recovery system (heat exchanger) so as to "recover" at least a portion of the heat energy of the material removed from the dirt collection area 71-1 and use this at least a portion of the heat energy to heat the liquid (washing liquid or final rinse liquid) to be sprayed in the dishwashing machine.

[0066] For example, it is conceivable that the material removed from the dirt collection area 71-1 is first filtered, wherein only the liquid component (washing liquid) is subsequently supplied to the heat recovery system. In this way, the risk of clogging or malfunction due to dirt particles can be effectively reduced.

[0067] Alternatively or additionally, it is conceivable that, after separating the dirt particles from the material removed from the dirt collection area 71-1, the liquid component (washing liquid) can be treated in such a way that it can be supplied back to the washing system of the dishwashing machine. The treatment that may be performed could be filtration.

[0068] Figure 3 A further embodiment of a conveyor-type dishwashing machine 50 according to the teaching configuration of the present invention is shown. This embodiment is consistent with the above reference. Figure 1 or Figure 2 The embodiments described in the illustrations are essentially the same, except that not only is the pre-wash zone 51 equipped with the dirt trapping system 70, but the main wash zone 52 is also equipped with the dirt trapping system, which will be referred to below. Figure 4 The illustrations in the diagrams provide a more detailed description of the construction and function of the dirt capture system.

[0069] and Figure 1 Compared to the illustrated embodiments, in Figure 3 In the conveyor-type dishwashing machine 50 shown, a feed opening 22 (see reference) is provided in or above the main washing tank 14-2. Figure 4 The filter 20-2 has an upwardly open dirt collection area 71-2 located below the supply opening 22. Dirt particles separated by the filter 20-2 are introduced into the dirt collection area 71-2 through the supply opening 22.

[0070] According to Figure 3 In the embodiment of the solution according to the invention shown, a dirt discharge piping system including a wastewater line 73-2 and a vertical pipe 72-2 is provided in the lower region of the dirt collection area 71-2. The material collected in the dirt collection area 71-2 (washing liquid and separated dirt particles) enters either a dirt trapping container 80 formed outside the main washing area 52 via a dirt discharge pump 74-2 or a waste treatment system 82 formed outside the conveyor-type dishwashing machine 50.

[0071] The following will refer to Figure 4 The illustrations in the diagrams describe the construction and function of the dirt capture system 70 in more detail.

[0072] A dirt capture system 70 is arranged within the washing tank 14 of a conveyor-type dishwashing machine 50 or a dishwashing machine configured as a cassette-type dishwashing machine. The dirt capture system 70 includes a tank cover filter 20, which is preferably arranged in the washing tank 14 above the level of the washing liquid received in the washing tank 14. The tank cover filter 20 is used to separate dirt particles from the washing liquid that has been sprayed and flows back into the washing tank due to gravity. For this reason, the tank cover filter 20 is provided with a suitable sieve aperture size.

[0073] The dirt collection area 71, configured as an upward-opening chamber, also belongs to the dirt capture system 70. Dirt particles separated by the cap filter 20 are supplied to the dirt collection area 71, which is configured as a chamber, through the opening. For this purpose, it is preferable that the cap filter 20 includes a drainage slope in the form of a ramp guiding toward the supply opening 22, wherein the upward-opening dirt collection area 71 is arranged below the supply opening 22.

[0074] like Figure 4 As shown, a pressure equalization system 90 (schematically shown in the figure) is particularly provided in the upper region of the sidewall of the dirt collection area 71. Figure 4 In the schematically illustrated embodiment of the dirt capture system 70, the pressure equalization system 90 is formed by a wall region in the sidewall of the dirt collection area 71, which is permeable to the washing liquid. In particular, it is conceivable to use a fine filter as the pressure equalization system.

[0075] Alternatively or additionally, other openings (specifically, slit-like or dot-like openings) may be conceived, particularly for promoting the formation of eddies in the dirt collection area 71 by the washing liquid laden with dirt particles.

[0076] In addition, it is possible to Figure 4As seen, the pressure equalization system 90 is configured on the sidewall of the dirt collection area 71, above a height of 30% of the length of the dirt collection area 71 measured from the connector 75 to the upper end region 76 of the dirt collection area 71. Due to this arrangement, the following situation is effectively prevented: during operation of the dirt discharge pump, uncontaminated washing liquid is drawn in through the pressure equalization system 90 (e.g., configured as a fine filter).

[0077] like Figure 4 As can be seen, the trough cover filter 20 is configured at least partially in a funnel shape, wherein the supply opening 22 is disposed inside the funnel-shaped region 21 of the trough cover filter 20, and preferably disposed in the conical region of the funnel-shaped region 21 of the trough cover filter 20.

[0078] Furthermore, preferably, the dirt collection area 71 is configured in a funnel shape at the upper end (see reference). Figure 4 The funnel-shaped region 75 in the filter can be inserted into the supply opening 22 of the cover filter 20 or received inside the supply opening.

[0079] In a dishwashing machine ( Figure 4 During operation (not shown), washing liquid is sprayed into the washing zone, with a portion of the sprayed washing liquid flowing back into the washing tank 14 through the tank cover filter 20. The remainder of the sprayed washing liquid flows directly into the dirt collection area 71 through the supply opening 22 provided in the tank cover filter 20 due to gravity. Dirt particles rinsed off the dishes during the washing process are prevented from entering the washing liquid collected in the washing tank 14 by the tank cover filter 20 if these dirt particles are larger than the mesh size of the tank cover filter 20. In fact, dirt particles separated by the tank cover filter 20 move to the supply opening 22 via a flow ramp and thus enter the dirt collection area 71.

[0080] To allow the dirt collection area 71 to be preferably automatically emptied, the dirt capture system 70 preferably also includes a dirt discharge piping system. Figure 4 In the illustrated embodiment of the dirt discharge system, the dirt discharge piping system includes a vertical pipe 72 connected to the lower region of the dirt collection area 71. The vertical pipe 72 is connected to the inlet on the suction side of the dirt discharge pump 74. The outlet on the pressure side of the dirt discharge pump 74 leads to a wastewater line 73, resulting in the removal of the contents of the dirt collection area 71 from the washing area when the dirt discharge pump 74 is activated.

[0081] The dirt discharge pump 74 is preferably designed to continuously or at a given time and / or event remove dirt particles collected in the dirt collection area 71 along with the washing liquid also collected in the dirt collection area 71. It is particularly conceivable here that the dirt discharge pump 74 is actuated by the already mentioned control unit 100 according to the amount of dirt particles collected in the dirt collection area 71.

[0082] However, it is conceivable that dirt may be pumped out of the dirt collection area 71 based on factors such as the height in the dirt collection area 71, the height in the washing tank 14, or other factors.

[0083] If a dirt trapping system 70 is used in a conveyor-type dishwashing machine 50 (see example...) Figures 1 to 3 Furthermore, it is conceivable that the dirt discharge pump 74 may be activated, for example, according to the conveying speed of the dishes being conveyed through the processing zone of the conveyor dishwashing machine 50, or for example, according to the amount of final rinse liquid sprayed per unit time in the final rinse zone 54.

[0084] The present invention is not limited to the embodiments described in conjunction with the accompanying drawings.

[0085] In this regard, for example, it is conceivable that the tank cover filters 20, 20-1, 20-2 of the dirt capture system 70 do not include a substantially centrally located supply opening 22 through which dirt particles separated by the tank cover filters 20, 20-1, 20-2 enter the dirt collection areas 71, 71-1, 71-2. In fact, the supply opening 22 can also be configured as a gap located at the edge region of the tank cover filters 20, 20-1, 20-2.

[0086] Furthermore, it is conceivable in principle that the supply opening 22 is covered by a coarse filter, wherein the mesh size of the coarse filter should preferably be larger than the mesh size of the cover filters 20, 20-1, 20-2. Providing such a coarse filter can effectively prevent, for example, knives, forks, or other utensils (rather than sewage particles) from unintentionally entering the dirt collection areas 71, 71-1, 71-2.

[0087] Although a combination of conveyor-type dishwashing machine 50 has been given for Figures 1 to 3 The description of the solution according to the present invention is as follows, but it is also conceivable that the dishwashing machine configured as a box-type dishwashing machine is equipped with a dirt capture system 70.

Claims

1. A dishwashing machine having at least one washing system (51, 52) configured as a recirculation loop, wherein, The at least one washing system (51, 52) includes: a nozzle system having at least one washing nozzle (13; 13-1, 13-2) for spraying washing liquid onto a dish to be washed; a washing tank (14; 14-1, 14-2) for capturing at least a portion of the sprayed washing liquid; and a washing pump (11; 11-1, 11-2) for supplying the washing liquid collected in the washing tank (14; 14-1, 14-2) to the at least one washing nozzle (13; 13-1, 13-2), and wherein a dirt capture system (70) is further provided associated with the at least one washing system (51, 52), wherein the dirt capture system (70) has an associated tank cover filter (20; 2) 0-1, 20-2), the tank cover filter is configured to separate dirt particles from the sprayed washing liquid that flows back into the washing tank (14; 14-1, 14-2) due to gravity, wherein the dirt capture system (70) includes a dirt collection area (71) arranged at least partially in the washing tank (14; 14-1, 14-2) and open upward to collect the dirt particles separated from the washing liquid by means of the tank cover filter (20; 20-1, 20-2), and wherein a dirt discharge system with a dirt discharge pipe system (72; 72-1, 72-2) is additionally provided, the dirt discharge system being fluidly connected to the dirt collection area (71), by means of which the dirt collection area (71) can be emptied when needed. Its features are, The dirt collection area (71) has an associated pressure equalization system (90) for reducing the negative pressure locally formed in the dirt collection area (71) when the dirt collection area (71) is emptied. The pressure equalization system (90) is at least partially disposed in the sidewall of the dirt collection area between the connector (75) and the opposite upper region (76) of the dirt collection area (71), by means of which the dirt collection area (71) is fluidly connected or fluidly connected to the dirt discharge piping system (72; 72-1, 72-2), and The pressure equalization system (90) includes a wall region having slit-like or dot-like openings formed along the periphery of the sidewall of the dirt collection area (71) in such a way that when the dirt collection area (71) is emptied, the washing liquid filled with dirt particles promotes the formation of eddies in the dirt collection area (71).

2. The dishwashing machine according to claim 1, in, The dishwashing machine is a machine used for washing tableware or utensils, and the dishwashing machine is configured as a box-type dishwashing machine or a conveyor-type dishwashing machine (50).

3. The dishwashing machine according to claim 1, in, The pressure equalization system (90) is configured on the side wall of the dirt collection area (71) in the area above 30% of the height of the dirt collection area (71) from the connector (75) to the upper region (76) of the dirt collection area (71).

4. The dishwashing machine according to claim 1, in, The pressure equalization system (90) includes a flexible wall region.

5. The dishwashing machine according to claim 1, in, The pressure equalization system (90) includes a wall region permeable to the washing liquid, or the pressure equalization system (90) is a filter.

6. The dishwashing machine according to claim 5, in, The pressure equalization system (90) mentioned therein is a fine filter.

7. The dishwashing machine according to claim 1, in, The capacity of the dirt collection area (71) is between 0.5 L and 3.0 L, and the effective diameter of the dirt discharge piping system (72; 72-1, 72-2) is at least 5 cm.

8. The dishwashing machine according to claim 7, in, The capacity of the dirt collection area (71) is between 1.0 L and 2.0 L.

9. The dishwashing machine according to claim 7, in, The dirt discharge system includes a dirt discharge pump (74; 74-1, 74-2), the suction side of which is fluidly connected or fluidly accessible to the dirt collection area (71), and the pressure side of which is fluidly connected or fluidly accessible to the dirt capture container (80), wherein the pump capacity of the dirt discharge pump is at least 100 L per minute.

10. The dishwashing machine according to claim 9, in, The pump capacity of the dirt discharge pump is at least 110 L per minute.

11. The dishwashing machine according to claim 1, in, The dirt discharge system includes at least one actuable valve arranged in the dirt discharge piping system (72; 72-1, 72-2) to fluidly connect the dirt collection area (71) to the dirt capture container (80) when needed or according to a given time and / or event.

12. The dishwashing machine according to claim 1, in, The tank cover filter (20; 20-1, 20-2) is arranged above the dirt collection area (71) and includes a drainage slope along the direction of the supply opening (22), wherein the dirt collection area (71), which is configured to open upwards, is arranged below the supply opening (22) in such a way that dirt particles separated from the washing liquid by means of the tank cover filter (20; 20-1, 20-2) enter the dirt collection area (71) through the supply opening (22).

13. The dishwashing machine according to claim 12, in, The trough cover filter (20; 20-1, 20-2) is configured at least partially in a funnel shape, and wherein the supply opening (22) is disposed inside the funnel-shaped region (21) of the trough cover filter (20; 20-1, 20-2).

14. The dishwashing machine according to claim 13, in, The supply opening (22) is configured in the conical region of the funnel-shaped region (21) of the trough cover filter (20; 20-1, 20-2).

15. The dishwashing machine according to claim 12, in, The supply opening (22) is positioned at the center of the trough cover filter (20; 20-1, 20-2).

16. The dishwashing machine according to claim 12, in, An additional coarse filter is provided, which at least partially covers the supply opening (22), and the mesh size of the coarse filter is larger than that of the sieve mesh size of the trough cover filter (20; 20-1, 20-2).

17. The dishwashing machine according to claim 1, in, At least the upper region of the dirt collection area (71) is configured as a funnel-shaped region.

18. The dishwashing machine according to claim 1, in, The dirt removal system includes a dirt removal pump (74; 74-1, 74-2), the suction side of which is fluidly connected or fluidly accessible to the dirt collection area (71), and the pressure side of which is fluidly connected or fluidly accessible to the dirt trapping container (80). A control unit (100) is also provided to actuate the dirt removal pump (74; 74-1, 74-2) according to the amount of dirt particles collected in the dirt collection area (71).

19. The dishwashing machine according to claim 18, in, The dirt-capturing container (80) is located outside the dishwashing machine.

20. The dishwashing machine according to claim 1, in, The dishwashing machine is configured as a conveyor-type dishwashing machine (50), wherein the at least one washing system (51, 52) is configured as at least one washing zone, and wherein, in addition to the at least one washing system (51, 52) configured as a washing zone, the conveyor-type dishwashing machine (50) further includes at least one final rinsing zone (54) and a conveying device (58) for conveying the dishes to be washed through the at least one washing system (51, 52) configured as a washing zone and the final rinsing zone (54), the final rinsing zone being connected downstream of the at least one washing system (51, 52) along the conveying direction (T) of the dishes; or The dishwashing machine is configured as a box-type dishwashing machine and includes a processing chamber, wherein the washing system (51, 52) is disposed within the processing chamber.

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