DE202006020580U1 - Commercial dishwasher in the form of a programmer - Google Patents

Abstract

Commercial dishwasher in the form of a programmer, comprising a washing tank (2) under a washing chamber (4); a washing liquid piping system (6) having a washing pump (8) for feeding washing liquid from the washing tank (2) into the washing chamber (4) through at least one spraying arm (12-1, 12-2); a fine sieve (24) above the wash tank (2) through which liquid sprayed in the wash chamber can flow by gravity into the wash tank; a coarse particle collection device (26) having a coarse particle inlet port (28) adjacent to the first fine screen (24) and extending downwardly to a coarse particle sump (32) for receiving coarse debris; a program control device (54) for at least one washing program which controls at least one washing phase, at least one final pumping step for the final pumping off of washing liquid from a wash tank sump (48) and at least one final rinse phase;
characterized,
in that the industrial dishwashing machine is designed to automatically carry out at least one intermediate draining step, during which intermediate pumping of washing liquid and dirt particles from at least the coarse particle sump (32) can be carried out, wherein the ...

Description

The The invention relates to a commercial dishwasher in the form of a programmer.

Such Commercial dishwashers are in particular hood dishwashers and under counter dishwashers.

Commercial dishwashers in the form of a program machine of this type are from the German utility model G 88 02 328.1 , of the DE 38 42 640 C2 and the US 4,754,772 known.

Brief description of the invention

The The invention is based on the following considerations and findings of the inventor.

At the Washing dishes, especially crockery, cutlery and Cooking utensils with commercial dishwashers will a large part of the dirt adhering to the dishes in the first few seconds of the washing phase from the surface of the items to be washed away.

in the further course of the washing phase become stubborn soiling removed from the ware, which, however, in the total represent a much smaller part of all pollution.

coarse dirt in the prior art during the washing phase in a Sieve basket is received and passes to the screen basket a manhole in a drain, from which he after the washing phase pumped by a drain pump and thereby from the wash tank is discharged.

rough Dirt particles, which during the washing phase in the strainer basket and remain in the shaft, are washed by the washing water and thereby washed out. This dissolves suspended matter from the coarse dirt. These dissolved suspended solids pass in the wash tank and contaminate the wash water again.

from Inventor tests have shown that in the Most commercial dishwashers approximately 10 seconds after switching on the washing pump (start of the washing phase) already about 80 percent of the coarse dirt from the dishes are washed down.

By the invention to be solved the task, the efficiency cleaning dishes in commercial dishwashers to improve.

These Task is according to the invention by the features of the independent protection claim solved.

Further Features of the invention are contained in the subclaims.

By the high dirt discharge already during an initial section the washing phase, the washing liquid is less polluted. The contamination of the washing liquid with dirt particles is reduced; which also the service life of the washing liquid is renewed before it has to be renewed. Further be discharged by the invention more suspended matter from the washing liquid as in the prior art.

All Features of the invention are in themselves and in each case technically possible combination with others revealed Features independently usable advantageous features the invention.

The The invention will be described below with reference to the accompanying drawings described by way of example with reference to a preferred embodiment. In the drawings show

1 1 is a schematic vertical section through a commercial dishwasher according to the invention in the form of a programmer with a closed drain valve;

2 schematically a vertical section of the commercial dishwasher of 1 with opened drain valve.

The commercial dishwashing machine according to the invention a programmer and can, for example, a hood dishwasher or be an under counter dishwasher.

The commercial dishwasher contains a wash tank 2 under a wash chamber 4 and a washing liquid piping system 6 with a washing pump 8th for pumping washing liquid from the interior 10 the wash tank 2 through at least one spray arm 12 , hereinafter wash arm 12 called, in the wash chamber 4 during a washing phase. Preferably, at least one upper wash arm 12-1 in the upper part of the wash chamber 4 above items to be cleaned and / or at least one lower wash arm 12-2 in the lower part of the wash chamber 4 arranged below the items to be cleaned. The wash arms 12 ( 12-1 . 12-2 ) can be arranged stationary, rotatable and / or linearly displaceable.

A cleaner inlet 14 serves to introduce cleaner 16 (shown schematically by arrows) into the wash chamber 4 ,

A rinse liquid line system 18 serves to supply rinse liquid from a fresh water connection 20 to at least one spray arm 22 , hereinafter rinse aid 22 called, and from this into the wash chamber 4 on items in it. Preferably, at least one upper rinse aid arm 22-1 and / or a lower rinse aid arm 22-2 above or below the items to be cleaned in the wash chamber 4 intended. The rinse aid arms 22-1 and 22-2 can be stationary or linear and / or rotatable.

A first fine sieve 24 is located above the wash tank 2 and separates the wash tank interior 10 from the wash chamber 4 , In the wash chamber 4 sprayed liquid (washing liquid or rinse liquid) flows by gravity through the first fine sieve 24 in the wash tank interior 10 ,

A coarse particle collector 26 has a coarse particle inlet opening 28 adjacent to the first fine sieve 24 , preferably in a recess 30 in the center of the first fine sieve 24 , and extends down to a coarse particle sump 32 for receiving coarse particles (coarse dirt particles), which are from the wash chamber 4 into the coarse particle inlet opening 28 fall or which by washing liquid over the first fine sieve 24 into the coarse particle inlet opening 28 be rinsed, and then into the coarse particle sump 32 fall by gravity or as will be described below, by means of a coarse particle sump 32 connected drain pump 34 in a drain line 36 be pumped out.

Preferably, the coarse particle collection device contains 26 , preferably in its coarse particle inlet opening 28 , a coarse strainer 38 for retaining large particles of dirt. The coarse strainer 38 may be a screen basket or part of a screen basket, in which large particles of dirt are collected. Preferably, the coarse screen 38 at least partially a peripheral wall of a screen basket, which has a closed basket bottom 40 having.

The coarse particle collector 26 preferably has a shaft 42 which extends from the edge of the coarse particle inlet opening 28 ie from the edge of the recess 30 of the first fine sieve 24 , down to the coarse particle sump 32 extends. The shaft wall 44 of the shaft 42 is preferably at least partially through a second fine screen 46 formed or with a second fine sieve 46 through which an exchange of liquid between the shaft 42 and the wash tank interior 10 can take place. The second fine sieve 46 is preferably located at the top of the shaft 42 and surround the coarse strainer 38 with radial distance.

A tank sump 48 is via a drain valve 50 with the coarse particle sump 32 connected. The two marshes 32 and 48 can be at the same height or at different heights. Preferably, the coarse particle sump is located 32 under the tank sump 48 , The wash tank 2 has a washing fluid outlet 52 to which the suction side of the washing pump 8th connected. The wash fluid outlet 52 is preferably at the level of the wash tank sump 48 but could be higher.

Between the fresh water connection 20 and the final rinse liquid line system 18 is preferably a rinse pump 53 , According to another embodiment, when a tap water pressure of the local network is sufficiently high and constant, the rinse pump may be used 53 be waived.

When first filling the dishwasher fresh water from the fresh water connection 20 through the rinse aid piping system 18 over the rinse arms 22 in the wash chamber 4 sprayed, and thereby the wash tank 2 to about the height of the first fine sieve 24 (or something about it or something below) filled. The drain valve 50 is appropriate 1 closed and the drain pump 34 , preferably also the washing pump 8th , are switched off. The rinse pump 53 is on.

cleanser 16 to wash the dishes is on the cleaner input 14 added to the fresh water.

All operations of the dishwasher are controlled by a program controller 54 automatically executed. The program control device 54 contains at least one wash program for controlling a program cycle. A program cycle consists of at least one wash phase and at least one final rinse phase.

If a washing program is started after the first filling, a washing phase first takes place, in which case accordingly 1 the drain valve 50 is closed and the drain pump 34 and the rinse pump 53 are switched off, however, the washing pump 8th is turned on. By filling the wash fluid line system 6 and the washing pump 8th the liquid level in the wash tank sinks 2 something off. The water flows in the wash tank 2 are in 1 through arrows 56 . 58 and 60 specified.

After completion of the washing phase, a final pumping step is carried out. Here is the Ab running valve 50 corresponding 2 opened and wash water from the tank interior 10 and from the shaft 42 Pumped off by the switched drain pump 34 , During this final pumping off of the washing liquid after completion of the washing phase is the washing pump 8th switched off.

The drain valve 50 operates preferably in the manner of a check valve in such a way that it is switched on washing pump 8th is closed by their suction, regardless of whether the drain pump 34 switched on or off. According to another embodiment, the drain valve 50 one from the program controller 54 be controlled valve.

For the in 2 Abpumpphase shown are the liquid flow directions in the wash tank 2 through arrows 57 . 59 . 61 and 63 shown schematically.

After the final pumping step of the washing liquid by means of the drain pump 34 begins the rinse phase. During the rinse phase are the wash pump 8th and the drain pump 34 off. Final rinse liquid, which pure fresh water of the fresh water connection 20 or with rinse aid 66 mixed fresh water is from the activated rinse pump 53 (or by the fresh water line pressure) through the rinse aid piping system 18 in the wash chamber 4 sprayed on the there located (not shown) dishes. rinse aid 66 can be on the suction side 68 or on the print side 70 the rinse pump 53 be added to the fresh water.

The sieve openings of the coarse sieve 38 are larger than the sieve openings of the first fine sieve 24 and also larger than the screen openings of the second fine screen 46 , The sieve openings of the second fine sieve 46 are preferably equal to or more preferably smaller than the screen openings of the first fine screen 24 , Examples of screen opening sizes may include, but are not limited to, the screen openings of the coarse screen 38 For example, have a hole diameter between 6 and 8 mm, preferably 7 mm; the sieve openings of the first fine sieve have, for example, a hole diameter between 2.0 and 3.0 mm, preferably 2.5 mm; and the screen openings of the second fine screen 46 preferably have a hole diameter between 0.8 and 1.5 mm, preferably 1.1 mm.

The height and the diameter of the shaft 42 are dependent on the size of the dishwasher. For example, the height may be between 150 mm and 300 mm and the diameter between 20 mm and 40 mm. The basket circumference wall formed Grobsieb 38 has, for example, an inner diameter between 100 and 150 mm. The wash tank 2 For example, has an inner diameter between 250 and 400 mm. The invention is not limited to the dimensions or geometric shapes specified in this patent application. All dimensions and geometrical shapes are dependent on the capacity of the dishwasher and its intended use, for example its use for cleaning pots, dishes and / or drinking glasses.

Preferably, a level sensor 74 provided for detecting a predetermined minimum liquid level in the wash tank, wherein the level sensor 74 with the program control device 54 and wherein the program control means is arranged to automatically terminate the final pumpdown step when the liquid level in the wash tank drops to or below the predetermined minimum liquid level.

3 shows the dishwasher of the invention during the performance of a Zwischenabpumpschrittes. The program control device 54 the dishwashing machine according to the invention is designed such that after a short initial running time of the washing phase, a Zwischenabpumpschritt is performed automatically, during which washing liquid and dirt particles from the coarse particle sump 32 by means of the drain pump 34 in the drain line 36 be pumped out. During the Zwischenabpumpschrittes remains the washing pump 8th Turned on, allowing the recirculation of wash fluid from the wash tank 2 to the wash arms 12-1 and 12-2 is not interrupted. Preferably, in this case, the drain valve remains 50 closed, so no washing liquid directly from the wash tank 2 from the drain pump 34 is pumped out.

This condition is in 3 shown. Because the shaft 42 from the coarse strainer 38 into the coarse particle sump 32 is continuously open from top to bottom, sucks the drain pump 34 during the Zwischenabpumpschrittes also washing liquid and dirt particles from the shaft 42 off, like this in 3 through arrows 76 . 77 and 78 is shown schematically.

The Duration of Zwischenabpumpens during Zwischenabpumpschrittes is shorter than the total duration of the washing phase, preferably shorter as half the washing phase or more preferably shorter than a quarter of the washing phase.

According to another embodiment of the invention, two or more automatic intermediate pumping steps are provided, which are carried out successively at short time intervals. The sum of the individual durations of the Zwischenabpumpvorgänge is shorter than the entirety of the washing phase, preferably shorter than half the washing phase or even more preferably shorter than a quarter of the washing phase.

In all embodiments, during the Zwischenabpumpschrittes only so much washing liquid is pumped out that in the wash tank 2 a sufficient amount remains to the required recirculation by means of the washing pump 8th sure.

The Dishwasher is advantageously designed such that the at least one Zwischenabpumpschritt automatically after a delay period in the range between 1 sec. and 20 sec., preferably between 2 sec. and 16 sec. preferably between 3 sec. and 12 sec., or preferably between 4 sec. and 8 sec. is started after starting the washing cycle. The delay time is preferably variably adjustable.

The automatic intermediate pumping during at least one Zwischenabpumpschrittes preferably lasts between 1 sec. and 10 sec., Or preferably between 2 sec. and 8 sec., or preferably between 3 sec. and 6 sec., or preferably between 3 sec. and 5 sec. The time duration of the intermediate pumping step is preferably variably adjustable.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 8802328 U [0003]
• - DE 3842640 C2 [0003]
• - US 4754772 [0003]

Claims (15)

Commercial dishwasher in the form of a program machine containing a wash tank ( 2 ) under a washing chamber ( 4 ); a washing liquid pipe system ( 6 ) with a washing pump ( 8th ) for conveying washing liquid from the washing tank ( 2 ) by at least one spray arm ( 12-1 . 12-2 ) in the wash chamber ( 4 ); a fine sieve ( 24 ) above the wash tank ( 2 ) through which liquid sprayed in the washing chamber can flow into the wash tank by gravity; a coarse particle collection device ( 26 ), which has a coarse particle inlet opening ( 28 ) adjacent to the first fine screen ( 24 ) and down to a coarse particle sump ( 32 ) for receiving coarse dirt particles extends; a program control device ( 54 ) for at least one washing program, which comprises at least one washing phase, at least one final pumping step for the final pumping off of washing liquid from a wash tank sump ( 48 ) and controls at least one rinse phase; characterized in that the industrial dishwashing machine is designed to automatically carry out at least one intermediate pumping step, during which an intermediate pumping out of washing liquid and of dirt particles at least from the coarse particle bottoms ( 32 ), wherein the intermediate pumping is started after a short initial running time of the washing phase and wherein the duration of the intermediate pumping is shorter than the total duration of the washing phase; and that the commercial dishwasher for automatically starting the Zwischenabpumpschrittes after a delay period in the range between 1 sec. and 20 sec., preferably between 2 sec. and 16 sec. preferably 3 sec. and 12 sec., preferably between 4 sec. and 8 sec. is formed after starting the wash cycle. A commercial dishwasher according to claim 1, characterized in that it is designed to pump out only as much washing liquid during the Zwischenabpumpschrittes that in the wash tank ( 2 ) remains a sufficient amount to the required recirculation of washing liquid by means of the washing pump ( 8th ). Commercial dishwashing machine according to claim 2, characterized in that it is designed such that the washing pump ( 8th ) remains switched on during the Zwischenabpumpschrittes. A commercial dishwasher according to at least one of the preceding claims, characterized in that it is adapted to at least partially transfer the amount of liquid pumped off during the intermediate pumping step by fresh water through the final rinse liquid line system ( 18 ) automatically refill before the program cycle is over. Commercial dishwashing machine according to at least one of the preceding claims, characterized by a coarse sieve ( 38 ) in the coarse particle inlet opening ( 28 ) for retaining large particles of dirt. Commercial dishwasher after at least one of the preceding claims, characterized that they are used for automatic intermediate pumping during the Intermediate pumping step for a period of time in the range between 1 sec. and 10 sec., preferably between 2 sec. and 8 sec., preferably between 3 sec. and 6 sec., preferably between 3 sec. and 5 sec. is trained. Commercial dishwasher after at least one of the preceding claims, characterized that the delay time is variably adjustable. Commercial dishwasher after a of claims 6 or 7, characterized in that the Duration of Zwischenabpumpens is variably adjustable. Commercial dishwashing machine according to at least one of the preceding claims, characterized in that the coarse particle collecting device ( 26 ) a shaft ( 42 ) extending from the coarse particulate inlet port ( 28 ) to the coarse particle sump ( 32 ) extends to guide coarse particles from the coarse particle inlet opening (FIG. 28 ) into the coarse particle sump ( 32 ). Commercial dishwashing machine according to claim 9, characterized in that the shaft ( 42 ) a shaft wall ( 44 ), which at least partially a second fine screen ( 46 ) or through a second fine sieve ( 46 ) whose fine screen openings form a fluid passage between the shaft ( 42 ) and the adjacent interior ( 10 ) of the wash tank ( 2 ) form. Commercial dishwashing machine according to claim 10, characterized in that the second fine sieve ( 46 ) is provided with equal or smaller sieve openings than the first fine sieve ( 24 ). Commercial dishwashing machine according to at least one of the preceding claims and claim 5, characterized in that the sieve openings of the coarse sieve ( 38 ) are larger than the screen openings of the first fine screen ( 24 ). Commercial dishwashing machine according to at least one of the preceding claims, characterized in that the wash tank sump ( 48 ) and the coarse particle sump ( 32 ) through a valve ( 50 ), which in each case with activated washing pump ( 8th ) and when the washing pump is switched off ( 8th ) is open. Commercial dishwashing machine according to at least one of the preceding claims, characterized in that the coarse particle sump ( 32 ) lower than the wash tank sump ( 48 ) is arranged. Commercial dishwashing machine according to at least one of the preceding claims, characterized in that a level sensor ( 74 ) is provided for detecting a predetermined minimum liquid level in the wash tank ( 2 ), whereby the level sensor ( 74 ) with the program controller ( 54 ), and wherein the program control means is adapted to automatically terminate a final pumpdown step when the liquid level in the wash tank (10) is 2 ) drops to or below the predetermined minimum liquid level.