ITUB20154655A1 - INDUSTRIAL DISHWASHER MACHINE - Google Patents

Description

DESCRIPTION

"INDUSTRIAL DISHWASHER MACHINE"

The present invention relates to an industrial dishwashing machine.

More in detail, the present invention relates to a tunnel dishwashing machine, to which the following discussion will make explicit reference without thereby losing generality.

As is known, tunnel dishwashing machines essentially consist of a linear conveyor which is able to step forward a succession of dishwasher baskets through a box-like tunnel, which extends horizontally and internally houses a washing chamber, a rinsing chamber and a drying chamber, which follow one after the other along the tunnel in such a way as to be traversed in sequence by the dishwasher baskets advancing in the tunnel itself.

More in detail, in correspondence with the washing chamber, the tunnel has a first series of nozzles which are oriented in such a way as to direct a plurality of jets of detergent liquid against the basket for dishes which is temporarily located in the washing chamber, and a hydraulic circuit capable of supplying a mixture of hot water and detergent at the inlet of these nozzles.

In correspondence with the rinsing chamber, the tunnel has a second series of nozzles which are oriented in such a way as to direct a plurality of jets of rinsing liquid against the basket that is temporarily located in the rinsing chamber, and a hydraulic circuit able to feed a mixture of hot water and rinse aid into these nozzles.

Finally, in correspondence with the drying chamber, the tunnel has a series of electrically operated fans, which are oriented in such a way as to direct a flow of air against the basket for dishes which is temporarily located in the drying chamber; and a series of electric resistors which are arranged immediately downstream of the fans in such a way as to be able to rapidly heat the air flow directed towards the dishwasher rack.

Unfortunately, tunnel dishwashing machines have a particularly high consumption of electricity, which represents the preponderant part of the overall operating costs of the machine, with all the problems this entails.

The object of the present invention is to significantly reduce the electricity consumption of this type of dishwashing machine.

In accordance with these objectives, according to the present invention an industrial dishwashing machine is realized as defined in claim 1 and preferably, but not necessarily, in any of the dependent claims.

The present invention will now be described with reference to the attached drawings, which illustrate a non-limiting embodiment thereof, in which;

- figure 1 is a side view of an industrial dishwashing machine made according to the dictates of the present invention, with parts in section and parts removed for clarity;

Figure 2 is an axonometric view of the hot air generator of the dishwashing machine illustrated in Figure 1, with parts in section and parts removed for clarity.

With reference to Figure 1, the number 1 indicates as a whole a dishwashing machine capable of being able to wash and dry a large number of dishes and / or other dishes in a few minutes.

The dishwashing machine 1 firstly comprises: an external box-like casing 2, preferably substantially parallelepiped in shape, which is equipped with a through tunnel 3 which extends more or less horizontally inside the box-like casing 2, and is dimensioned in such a way to be crossed by a succession of dish-carrying baskets 4 of a known type; and a linear conveyor 5 preferably electrically operated, which is adapted to advance, preferably stepwise, a succession of dish-carrying baskets 4 through the tunnel 3.

The through tunnel 3 houses inside at least one washing chamber 6, a rinsing chamber 7 and a drying chamber 8, which follow one after the other in such a way as to be crossed in succession by the dish-carrying baskets 4 which the linear conveyor 5 advances along the tunnel 3. Preferably, the drying chamber 8 is also located immediately upstream of the exit of the through tunnel 3, while the rinsing chamber 7 is preferably located immediately upstream of the drying chamber 8.

Inside the washing chamber 6, each dish holder basket 4 is hit by a plurality of jets of detergent liquid with a temperature preferably between 50 ° C and 60 ° C, which are able to remove the food residues present on the dishes contained in the basket 4.

Inside the rinsing chamber 7, each dish holder basket 4 is hit by a plurality of jets of rinsing liquid with a temperature preferably between 70 ° C and 90 ° C, which are able to remove any residual detergent liquid present on the dishes contained in the crockery basket 4.

Inside the drying chamber 8, each dish-carrying basket 4 is finally hit by a jet of hot air with a temperature preferably higher than 50 ° C, which is capable of rapidly drying the dishes contained in the dish-carrying basket 4.

Optionally, the tunnel 3 additionally also houses a pre-washing chamber 9, which is positioned upstream of the washing chamber 6.

Inside the prewash chamber 9, each dish holder basket 4 is hit by a plurality of jets of water or detergent liquid, preferably, but not necessarily, at room temperature, which are capable of moistening and possibly removing food residues. present on the dishes contained in the dishwasher basket 4.

With reference to Figure 1, in the example illustrated, in particular, the outer box-like casing 2 is preferably provided with a substantially straight through tunnel 3 and preferably also with a square section. Preferably, the linear conveyor 5, on the other hand, extends inside the tunnel 3 for the entire length of the tunnel 3, and preferably also protrudes from the two ends of the tunnel 3 in such a way as to facilitate the deposit and removal of the carrying baskets. 4 dishes from the conveyor.

More in detail, in the example illustrated the linear conveyor 5 preferably comprises: a pair of horizontal feed belts or chains 10 which extend inside the tunnel 3 side by side, close to the bottom of the tunnel 3, and are wound in a ring around two pairs of pulleys or transmission toothed wheels 11 which are fixed in an axially rotatable manner on two support brackets 12 which protrude from the box-like casing 2, at the two ends of the tunnel 3; and an electric motor 13 which is mechanically coupled to a pair of pulleys or toothed wheels 11, so as to be able to rotate the two pulleys or toothed wheels 11, so as to move the two feed belts or chains 10 in a synchronized manner,

The upper horizontal branches of the two feed belts or chains 10 are adapted to receive the crockery-carrying baskets 4 in support and concur to form the feed plane P of the linear conveyor 5.

With reference to Figure 1, in addition, the dishwashing machine 1 comprises: a first series of nozzles 14 which are positioned inside the tunnel 3 in correspondence with the washing chamber 6, at a predetermined height from the feed plane P of the linear conveyor 5, and are oriented in such a way as to direct a plurality of jets of detergent liquid against the dish-holder basket 4 which is temporarily located in correspondence with the washing chamber 6, below the nozzles 14; and a hydraulic circuit which is capable of supplying at the inlet to the nozzles 14 a detergent liquid having a pressure preferably higher than 1.2 bar and a temperature preferably between 50 ° C and 60 ° C.

More in detail, the dishwashing machine 1 preferably comprises: a first collection tank 15 which is positioned on the bottom of the tunnel 3, i.e. below the linear conveyor 5, vertically aligned with the nozzles 14, so as to collect the detergent liquid which drips on the bottom of the tunnel 3 after hitting the crockery basket 4; and a first hydraulic circuit 16 which is capable of withdrawing the detergent liquid from the collection tank 15 and then feeding it at the inlet to the nozzles 14 with a pressure preferably higher than 1.2 bar and with a temperature preferably between 50 ° C and 60 ° C.

In the example illustrated, in particular, the hydraulic circuit 16 preferably includes: an electrically operated circulation pump 17, which has the suction connected to the bottom of the collection tank 15, and the delivery connected to the nozzles 14 by means of a suitable connection 18, so as to be able to pump the detergent liquid towards the nozzles 14 with a pressure preferably higher than 1.2 bar; an electric boiler 19 or similar, which is located along the connection pipe 18 and is capable of heating the detergent liquid leaving the circulation pump 17 preferably up to a temperature of between 50 ° C and 60 ° C; and finally a filtering member 20 which is preferably located upstream of the circulation pump 17, and is adapted to retain any impurities present in the liquid directed towards the nozzles 14.

Preferably, the dishwashing machine 1 is also equipped with a first water supply line (not shown) which, on command, is capable of introducing clean water into the collection tank 15; and of a detergent feeding device 21 preferably electrically operated which, on command, is able to take a predetermined quantity of detergent from a storage tank 22 and introduce it into the collection tank 15 or directly into the pipe 18 that connects the pump circulation 17 to the nozzles 14.

In the example illustrated, therefore, the hydraulic circuit 16 is preferably adapted to send a mixture of hot water and detergent with a pressure preferably higher than 1.2 bar to the inlet of the nozzles 14.

In addition to what is written above, preferably the collection tank 15 is also provided with an overflow discharge duct 23 which is structured in such a way as to automatically let the quantity of liquid that exceeds a maximum level flow out of the collection tank 15 predetermined.

With reference to Figure 1, the dishwashing machine 1 preferably also comprises: a second series of nozzles 24 which are positioned inside the tunnel 3 in correspondence with the rinsing chamber 7, at a predetermined height from the feed plane P of the linear conveyor 5, and are oriented in such a way as to direct a plurality of jets of rinsing liquid against the dish rack 4 which is temporarily located in correspondence with the rinsing chamber 7, below the nozzles 24; and a hydraulic circuit which is capable of supplying at the inlet to the nozzles 24 a rinsing liquid having a pressure preferably higher than 1.5 bar and a temperature preferably between 70 ° C and 90 ° C.

More in detail, the dishwashing machine 1 preferably comprises: a second collection tank 25 which is positioned on the bottom of the tunnel 3, i.e. below the linear conveyor 5, vertically aligned with the nozzles 24, so as to collect the rinsing liquid which it drips on the bottom of the tunnel 3 after hitting the crockery basket 4; and a second hydraulic circuit 26 which is capable of withdrawing the rinsing liquid from the collection tank 25 and then feeding it into the nozzles 24 with a pressure preferably higher than 1.5 bar and with a temperature preferably between 70 ° C and 90 ° C.

In the example illustrated, in particular, the hydraulic circuit 26 preferably includes: an electrically operated circulation pump 27, which has the suction connected to the bottom of the collection tank 25, and the delivery connected to the nozzles 24 by means of a suitable connection 28, so as to be able to pump the detergent liquid towards the nozzles 24 with a pressure preferably higher than 1.5 bar; an electric boiler or similar 29, which is located along the connection pipe 28 and is capable of heating the detergent liquid leaving the circulation pump 27 preferably up to a temperature of between 70 ° C and 90 ° C; and preferably also a filtering member 30 which is preferably located upstream of the circulation pump 27, and is adapted to retain any impurities present in the liquid directed towards the nozzles 24.

Preferably, the dishwashing machine 1 is also equipped with a second water supply line (not shown) which, on command, is capable of introducing fresh water into the collection tank 25; and a rinse aid supply device 31, preferably electrically operated, which, on command, is capable of withdrawing a predetermined quantity of rinse aid from a storage tank 32 and introducing it into the collection tank 25 or directly into the pipe 28 that connects the pump circulation 27 to the nozzles 24.

In the illustrated example, therefore, the hydraulic circuit 26 is preferably adapted to send a mixture of hot water and rinse aid to the inlet of the nozzles 24.

Similarly to the collection tank 15, also the collection tank 25 is preferably provided with an overflow discharge duct 33 which is structured in such a way as to automatically let the quantity of liquid that exceeds a maximum level flow out of the collection tank 25. predetermined.

In a different embodiment, however, the suction of the circulation pump 27 can be connected to the boiler 29 which, in turn, is connected to the water mains, so as to receive the water directly from the mains.

In this case, the rinse aid supply device 31 is able to introduce the rinse aid directly into the boiler 29 or into the pipe 28 which connects the circulation pump 27 to the nozzles 24.

Again with reference to Figure 1, preferably the dishwashing machine 1 also comprises: a third series of nozzles 34 which are positioned inside the tunnel 3 in correspondence with the pre-wash chamber 9, at a predetermined height from the conveyor advancement plane P linear 5, and are oriented in such a way as to direct a plurality of jets of water or detergent liquid against the dish-holder basket 4 which is temporarily located in correspondence with the pre-wash chamber 9, below the nozzles 34; and a hydraulic circuit which is capable of supplying water or detergent liquid having a pressure preferably higher than 1.2 bar at the inlet to the nozzles 34.

More in detail, the dishwashing machine 1 preferably comprises: a third collection tank 35 which is positioned on the bottom of the tunnel 3, i.e. below the linear conveyor 5, vertically aligned with the nozzles 34, so as to collect the water or detergent liquid that drips onto the bottom of the tunnel 3 after hitting the dish rack 4; and a third hydraulic circuit 36 which is capable of withdrawing the water or the detergent liquid from the collection tank 35 and then feeding it at the inlet to the nozzles 34 with a pressure preferably higher than 1.2 bar.

In the example illustrated, in particular, the hydraulic circuit 36 preferably includes: an electrically operated circulation pump 37, which has the suction connected to the bottom of the collection tank 35, and the delivery connected to the nozzles 34 by means of a suitable connection 38, so as to be able to pump the detergent liquid towards the nozzles 34 with a pressure preferably higher than 1 bar; and preferably a filtering member 39 which is preferably located upstream of the circulation pump 37, and is adapted to retain any impurities present in the liquid directed towards the nozzles 34.

Preferably, the dishwashing machine 1 is also equipped with a third water supply line (not shown) which, on command, is capable of introducing fresh water into the collection tank 35; and optionally also a second detergent feeding device (not shown) preferably electrically operated which, on command, is capable of withdrawing a predetermined quantity of detergent from the storage tank 22 and introducing it into the collection tank 35 or directly into the pipe 38 which connects the circulation pump 37 to the nozzles 34.

In the example illustrated, therefore, the hydraulic circuit 36 is preferably adapted to send a mixture of water and detergent to the inlet of the nozzles 34.

Finally, the collection tank 35 is also preferably provided with an overflow discharge duct 40 which is structured in such a way as to automatically cause the quantity of liquid that exceeds a predetermined maximum level to exit automatically from the collection tank 35.

With reference to Figure 1, the dishwashing machine 1 additionally comprises: a hot air generator 41 which is capable of producing, inside the section of the tunnel 3 corresponding to the drying chamber 8, a concentrated jet of hot air 42 which it is directed in such a way as to strike the dish-holder basket 4 which is located in correspondence with the drying chamber 8, and has an air temperature higher than 45 ° C and preferably between 50 ° C and 60 ° C; and optionally also a fourth collection tank 43 which is positioned on the bottom of the section of the tunnel 3 corresponding to the drying chamber 8, below the linear conveyor 5, in such a way as to collect the liquid that drips from the dishwasher rack 4 directed towards the tunnel exit 3.

More in detail, the hot air generator 41 is preferably structured in such a way as to be able to create / produce, within the section of the tunnel 3 corresponding to the drying chamber 8, at least one transverse air curtain 42 which intersects the path of advancement of the crockery baskets 4 in such a way as to be crossed by the crockery basket 4 directed towards the exit of the tunnel 3. Preferably, the transverse air curtain 42 also has an air temperature higher than 45 ° C and preferably between 50 ° C and 60 ° C.

In addition, the transverse air curtain 42 is preferably substantially vertical and locally perpendicular to the direction of advancement of the crockery baskets 4 along the final section of the tunnel 3 corresponding to the drying chamber 8.

With reference to Figures 1 and 2, the hot air generator 41 essentially comprises an electrically operated turbocharger 44, which is capable of subjecting the intake air to a substantially adiabatic compression, so as to provide an outlet flow air which has higher pressure and temperature values than those of the intake air. In addition, the hot air generator 41 also comprises at least one conveyor nozzle 45, which is connected to the delivery port 44a of the turbocharger 44, preferably by means of a connecting pipe 46, in such a way as to receive the high-flow hot air inlet. outlet pressure from the turbocharger 44, and is structured / dimensioned in such a way as to produce, inside the tunnel 3, the jet of hot air 42 destined to hit the basket 4 which is located in the section of the tunnel 3 corresponding to the drying chamber 8.

More in detail, the turbocharger 44 is preferably structured / sized in such a way as to produce at the outlet a flow of hot air with pressure and temperature values that are at least 10% higher than those of the air sucked in by the turbocharger 44 itself.

In the example illustrated, in particular, the turbocharger 44 is able to suck in air at ambient pressure, that is to say at a pressure of about 1 atm (atmosphere), and to supply at the outlet a flow of hot air which has a preferably higher or equal pressure. at 1.4 atm (atmospheres) and a temperature higher than 45 ° C and preferably between 50 ° C and 60 ° C.

Preferably, the conveying nozzle 45 is instead structured / shaped in such a way as to produce, inside the section of the tunnel 3 corresponding to the drying chamber 8, an air blade 42 which is preferably substantially vertically and locally substantially perpendicular to the direction d for the advancement of the dish-carrying baskets 4, in such a way as to be crossed by the dish-carrying baskets 4 which advance inside the drying chamber 8, directed towards the exit of the tunnel 3.

More in detail, with reference to Figures 1 and 2, in the example illustrated the turbocharger 44 is preferably housed inside a closed compartment 47 which preferably communicates directly with the section of the tunnel 3 corresponding to the drying chamber 8 through an opening or ventilation duct 48 which is able to convey hot air from tunnel 3 to closed compartment 47.

In addition, the intake port 44b of the turbocharger 44 preferably communicates directly with the closed compartment 47, so that the turbocharger 44 can suck solely or mainly the air present inside the closed compartment 47.

In the example illustrated, in particular, the closed compartment 47 is preferably obtained inside the box-like casing 2, immediately above the section of the through tunnel 3 corresponding to the drying chamber 8, and preferably communicates with the section of the through tunnel 3 corresponding to the drying chamber 8 through an opening 48 made directly on the ceiling of the tunnel 3, preferably immediately upstream of the exit of the tunnel 3.

Preferably, the hot air generator 41 also comprises also a filtering member 49 preferably with a bell-shaped structure, which is placed to close the intake port 44b of the turbocharger 44 in such a way as to retain any dust and other impurities suspended in the air sucked in by the turbocharger 44.

With reference to Figures 1 and 2, preferably the conveyor nozzle 45 is instead located inside the tunnel 3, preferably immediately below the closed compartment 47, at a predetermined height from the advancement plane P of the linear conveyor 5, and is oriented in such a way as to direct the air blade 42 towards the advancement plane P of the underlying linear conveyor 5, preferably in a substantially orthogonal direction from the advancement plane P of the linear conveyor 5, ie in the vertical direction.

More in detail, the nozzle 45 preferably comprises a preferably straight tubular collector 50, which has its two ends closed airtight and extends horizontally and perpendicularly to the direction of advancement of the baskets 4, flush with the ceiling of the through tunnel 3, i.e. at a predetermined height from the advancement plane P of the linear conveyor 5.

The tubular manifold 50 communicates directly with the pipe 46, and has, along the side wall facing the advancement plane P of the linear conveyor 5, a long longitudinal through slot 50a which has a width preferably less than 6 mm (millimeters) and extends substantially parallel to the longitudinal axis L of the manifold, preferably substantially along the entire length of the tubular manifold 50.

Preferably, the nozzle 45 also comprises also an accelerator spout 51 which protrudes from the lateral wall of the tubular manifold 50 in correspondence with the longitudinal slot 50a, and has a converging profile in such a way as to increase the speed of the air that comes out of the tubular manifold. 50 through the longitudinal slot 50a.

In the example illustrated, in particular, the tubular collector 50 preferably has a circular section, and extends perpendicularly to the direction of advancement of the crockery baskets 4, substantially for the entire width of the through tunnel 3.

Preferably, the tubular manifold 50 also has a diameter of between 3 and 10 cm (centimeters); while the longitudinal through slit 50a has a width preferably comprised between 2 and 4 mm (millimeters).

The accelerator spout 51, on the other hand, has an air outlet with a width preferably less than 2 mm (millimeters).

With reference to figure 1, preferably the dishwashing machine 1 is finally also equipped with a first splash curtain 52 located at the entrance to the through tunnel 3; a second splash curtain 53 located at the exit of the through tunnel 3; and optionally also of a third splash curtain 42 located inside the passing tunnel 3, between the rinsing chamber 7 and the drying chamber 8.

The operation of the dishwashing machine 1 can be easily deduced from what has been written above and therefore does not require further explanations, except to specify that the turbocharger 44 is able to heat the air up to the required temperature, without the need to use resistors or other control systems. air heating.

The advantages deriving from the use of the turbocharger 44 are considerable.

In the first place, the turbocharger 44 allows to drastically reduce the consumption of electric energy because it allows to eliminate the battery of resistors which normally serves to heat the air with which the dishes leaving the tunnel 3 are dried.

Furthermore, the housing of the turbocharger 44 inside the closed compartment 27 from which the air used to dry the dishes is also sucked in, allows the heat produced by the electric motor of the turbocharger 44 to be exploited to further heat the air that enters. in the intake port 44b of the turbocharger 44.

Similarly, the presence of the connection opening or duct 48 allows to recirculate / recycle a significant part of the hot air introduced into the tunnel 3 at the drying chamber 8.

Finally, it is clear that modifications and variations can be made to the dishwashing machine 1 without thereby departing from the scope of the present invention.

For example, in a different embodiment, the linear conveyor 5 could be structured to be able to advance a succession of loose crockery through the through tunnel 3, i.e. without such crockery being stored inside the crockery baskets 4.

Furthermore, in a less sophisticated embodiment, the through tunnel 3 could house only the drying chamber 8.

Alternatively, the through tunnel 3 could house, upstream of the drying chamber 8, only the washing chamber 6 or the rinsing chamber 7.

And still, in a further less sophisticated embodiment, the outer casing 2 could be devoid of the through tunnel 3 and instead be equipped with a single watertight chamber, which is suitably sized to accommodate one or more baskets at the same time. dishes 4, and houses inside both the nozzles 14 and 24 and the conveyor nozzle 45.

The nozzles 14 and 24 are positioned inside the sealed chamber in such a way as to be able to project the jets of detergent liquid and the jets of rinsing liquid against the dish-holder baskets 4 previously positioned inside the same sealed chamber.

The conveyor nozzle 45 of the hot air generator 41 is instead positioned inside the sealed chamber in such a way as to direct the flow of hot air coming from the turbocharger 44 against the crockery basket (s) 4 stationary inside the same sealed chamber .

Claims (14)

R IV EN D IC A T IO N I 1. Dishwashing machine (1) comprising an external box-like casing (2) which internally has at least one drying chamber (8) suitable for receiving a certain quantity of dishes, and a hot air generator (41) capable of projecting a jet of hot air (42) against the dishes present inside said drying chamber (8); the dishwashing machine (1) being characterized by the fact that said hot air generator (41) comprises: an electrically operated turbocharger (44), which is capable of subjecting the sucked air to a substantially adiabatic compression, in a manner such as to provide an output flow of air which has higher pressure and temperature values than those of the intake air. 2. Dishwashing machine according to claim 1, characterized in that the hot air generator (41) also comprises a conveyor nozzle (45) which is connected to the delivery port (44a) of the turbocharger (44) in such a way as to receive at the inlet the flow of high pressure hot air leaving the turbocharger (44), and producing said jet of hot air (42) at the outlet. Dishwashing machine according to claim 1 or 2, characterized in that the turbocharger (44) produces at its outlet a flow of hot air with pressure and temperature values that are at least 10% higher than those of the air sucked in by the same turbocharger (44). 4. Dishwashing machine according to any one of the preceding claims, characterized in that the hot air generator (41) also comprises a filtering member (49) which is placed to close the intake port (44b) of the turbocharger (44) in such a way as to retain impurities suspended in the air sucked in by the turbocharger (44). 5. Dishwashing machine according to any one of the preceding claims, characterized in that the turbocharger (44) is housed inside a closed compartment (47). 6. Dishwashing machine according to claim 5, characterized in that the intake port (44b) of the turbocharger (44) communicates directly with the closed compartment (47), so that the turbocharger (44) can suck the air present inside said closed compartment (47). 7. Dishwashing machine according to claim 5 or 6, characterized in that the closed compartment (47) communicates with the drying chamber (8) through a ventilation opening or duct (48). 8. Dishwashing machine according to any one of the preceding claims, characterized in that it also comprises, in correspondence with the bottom of the drying chamber (8), a first collection tank (43) adapted to collect the liquid that drips from the dishes present in the inside of said drying chamber (8). Dishwashing machine according to any one of the preceding claims, characterized in that the external box-like casing (2) is equipped with a through tunnel (3) which houses said drying chamber (8) and is able to be engaged by a succession dishes or crockery baskets (4). 10. Dishwashing machine according to claim 9, characterized in that it also comprises a linear conveyor (5) adapted to advance a succession of crockery or dish-carrying baskets (4) through said through tunnel (3). 11. Dishwashing machine according to claim 9 or 10, characterized in that the conveyor nozzle (45) is able to produce inside the passing tunnel (3) at least one transverse air curtain barrier (42) which intersects the path of advancement of the dishes or dish-carrying baskets (4) in such a way as to be crossed in succession by the dishes or dish-carrying baskets (4) directed towards the exit of the passing tunnel (3). Dishwashing machine according to claim 9, 10 or 11, characterized in that the through tunnel (3) houses, upstream of said drying chamber (8), also a washing chamber (6) and / or a washing chamber rinse (7). 13. Dishwashing machine according to claim 12, characterized in that it comprises a series of nozzles ( 14, 24, 34) adapted to direct a plurality of jets of washing liquid against the dishes or the dish-carrying baskets (4) which pass inside the passing tunnel (3); and a hydraulic circuit (16, 26, 36) capable of supplying the washing liquid entering said nozzles (14, 24, 34). 14. Dishwashing machine according to claim 13, characterized in that it comprises, inside the passing tunnel (3) and in correspondence with said washing chamber (6) and / or said rinsing chamber (7), a second tank collection chamber (15, 25, 35) which is positioned on the bottom of the washing chamber (6) and / or of the rinsing chamber (7), in such a way as to collect the washing liquid that drips from the dishes or from the dishes (4) present inside the washing chamber (6) and / or rinsing chamber (7); said hydraulic circuit (16, 26, 36) being able to take the washing liquid from said second collection tank (15, 25, 35) and then feed it at the inlet to said nozzles (14, 24, 34) with a pressure preferably higher than 1.2 bar.