EP3473156A1 - Dishwasher - Google Patents

Abstract

Dishwasher, in particular domestic dishwasher, with a washing compartment (4) providing a washing container (3), which serves to receive items to be cleaned, a collecting pot (10) into which the washing compartment (3) opens, one within the washing compartment (3) arranged Spray arm (7) for loading of items to be cleaned with rinsing liquor, and a circulating pump (11), wherein the spray arm (7) to the circulation pump (11) is fluidly connected, wherein the fluidic connection (16) between the circulation pump (11) and Having the spray arm (7) and / or the spray arm (7) to the rinsing chamber (4) and / or the collecting pot (10) open, rinsing flipper pressure dependent closing leakage opening (29).

Description

The invention relates to a dishwasher, in particular a domestic dishwasher, with a rinsing container providing a rinsing container, which serves to receive items to be cleaned, a collecting pot into which the rinsing container opens, a spray arm arranged within the rinsing for applying to be cleaned items with rinse liquor, and a circulation pump, wherein the spray arm is fluidly connected to the circulation pump. Furthermore, the invention relates to a method for introducing fresh water into a dishwasher, in which the fresh water of the dishwasher is supplied from a fresh water discharge point.

Dishwashers of the type mentioned are well known from the prior art, which is why it does not require a separate documentary evidence at this point.

Previously known dishwashers have a washing container which provides a washing compartment. This is the user side accessible via a feed opening, which is fluid-tightly closed by means of a pivotally mounted washroom door. When used as intended, the washing container serves to receive items to be cleaned, which may be dishes, cutlery pieces and / or the like, for example.

For loading of items to be cleaned with rinsing liquid, the so-called. Rinse liquor, the dishwasher has a spray in the interior of the washing container. This spraying device typically provides rotatably mounted spray arms, wherein usually two or three such spray arms are provided. In the intended use, a loading of the items to be cleaned with rinse liquor by means of rotating spray arms.

The rinse liquor dispensed by the spraying device during operation strikes the items to be cleaned and then collects in a collecting pot, into which the rinsing container discharges. The collecting pot is connected to a circulation pump on the one hand and to a Drain pump on the other hand connected. The circulating pump, which circulates the rinsing liquid conveyed into the dishwasher in the intended use case, serves to pressurize the spraying device with rinsing solution. With the completion of a wash program, the wash liquor is pumped out by means of the drain pump and discarded.

At the beginning of a washing program, the dishwasher is supplied with fresh water from a fresh water delivery point. The collecting pot of the dishwasher has for this purpose a fresh water inlet, which is fluidically connected to the fresh water discharge point, for example by means of a hose. Once the collecting pot is filled with sufficient fresh water for proper operation of the circulation pump, the circulation pump is put into operation, as a result of which the spray arms of the spraying device are charged with washing liquor.

Due to the design remains even after a proper pumping out of wash liquor by means of the drain pump to conclude a wash program a non-recoverable remainder of wash liquor in the pump housings of circulation pump and drain pump, in the collecting pot and in the lines to form fluidic connections between the collecting pot and the circulation pump on the one hand and the Collection pot and the drain pump on the other. If an intended washing program is then started by the introduction of fresh water, the fresh water is mixed with a residual rinsing liquor still present in the dishwasher. This leads to an unwanted carryover of lye and / or chlorides in the newly started wash program. Disadvantageously, it can lead to corrosion, both on dishwasher-side components, such as the heater, the pump housings, the leads and / or the like, as well as on the items to be cleaned.

To counteract such leaching and / or chloride entrainment, it is from the EP 2 759 244 B1 It is known to introduce fresh water for flushing in particular of the circulating pump and the collection pot into the dishwasher after a washware cleaning has been completed as intended. This beats the EP 2 759 244 B1 to introduce fresh water on the pressure side of the circulation pump in this, namely when the circulating pump, that is pumpless. The introduced into the circulation pump fresh water flows through the circulation pump and passes from there via the corresponding connecting lines directly to the collecting pot. From here can take place a removal by switching on the drain pump. In this case, as a result of the fresh water discharge, the residual rinsing liquor in the dishwasher is not only merely mixed with the fresh water, but a substantial expulsion of the residual rinsing liquor by displacement occurs. It can be achieved with relatively little fresh water, a nearly complete disposal of Restspülflotte, so that in a subsequent washing program largely no lye and / or chloride residues are abducted.

Although the after the EP 2 759 244 B1 previously known construction has proven in everyday practical use, there is room for improvement, in particular with regard to a simplified construction of the dishwasher. It is therefore an object of the invention to develop a generic dishwasher to the effect that a flushing of the liquor and / or chloride range is made possible with reduced machine-side structure.

To solve this problem, the invention proposes a dishwasher of the type mentioned above, which is characterized in that the fluidic connection between the circulation pump and the spray arm and / or the spray arm to the washing and / or collecting pot open, rinsing flipper pressure depending closing leakage opening having.

In addition, the method proposes a method for introducing fresh water into a dishwasher, the fresh water of the dishwasher is supplied from a fresh water discharge point, the fresh water of a circulation pump suction side, preferably Saugmundseitig abandoned and from there by means of the circulation pump in a flow-connected to the circulation pump collecting pot is pumped, wherein the circulating pump discontinued fresh water is supplied to the collecting pot via a to a washing room and / or collecting pot open, rinsing fluid pressure dependent closing leakage opening in a spray arm and / or in a fluidic connection between the circulating pump and a spray arm.

It is inventively provided a leakage opening. This leakage opening is provided by the spray arm and / or formed in the fluidic connection between the circulation pump and the spray arm. In the case of purging the lye and / or chloride, the water supplied to the dishwasher is passed through this leakage opening and introduced into the washing compartment and / or the collecting pot. It can be achieved without additional machine-side parts a complete flushing of the alkali and / or chloride range.

The leakage opening is formed according to the invention rinsing liquid depending on closing. This results in the intended operation of carrying out a wash program a sealed leakage opening. The construction according to the invention therefore ensures that the leakage opening is only opened when a fresh water discharge takes place below a certain pressure level, which is typically the case when introducing fresh water for flushing through the leachate and / or chloride line. When a washing program is carried out as intended, a pressure which is above this pressure level is formed in the circulated washing liquor, which leads to an automatic closure of the leakage opening.

The embodiment of the invention also has the advantage of a very short distance in the case of flushing. The circulating pump discontinued fresh water passes directly to the fluidic connection between the circulation pump and the spray arm, so that then on the inventively provided leakage point a comparatively short return flow is given in the collecting pot. In this respect, the inventive design is suitable not only for the case of flushing the lye and / or chloride route, but also for other applications, according to the shortest possible route is preferred. To name in this context, for example, a Spülflottenaufheizung by means of a built-in circulation pump heater. In this case, a comparatively fast rinsing liquor heating can be achieved by guiding the rinsing liquor over the leakage opening provided according to the invention, which requires a comparatively short route in the already described manner.

In contrast to the prior art, the fresh water inlet is not the pressure side, but formed on the suction side of the circulation pump. The process therefore carried out a flushing of the alkali and / or chloride route by using the circulation pump, that is not pumplessly in contrast to the prior art.

The suction-side connection to the circulating pump is preferably formed in the region of the suction mouth of the circulating pump, that is, the suction mouth side. In this context, the "suction-mouth-side" design of the fresh-water inlet in the sense of the invention means that a fresh-water inlet takes place directly into the circulating pump without the incoming fresh water entering other regions of the collection pot. A suction-suction-side design in this sense is present, in particular, when the fresh-water inlet is formed within the fluidic connection between the collecting pot and the circulating pump.

In the intended use case, therefore, an admission of the circulation pump with fresh water, which is then circulated when the circulating pump by means of the circulation pump. If a flushing of the liquor and / or chloride route is to take place, the fresh water introduced into the dishwasher and fed to the circulation pump is fed to the spray arm which is in fluid communication with the circulating pump. However, unlike the normal rinsing operation, there is no spray arm actuation because the fresh water exits via the leakage opening provided according to the invention and flows into the collecting pot, either directly or with the interposition of the flushing chamber, depending on the design of the leakage opening. In any case, the pump housing of the circulation pump, the fluidic connection to the spray arm and the collecting pot of fresh water flows through, which leads to the removal of any lye and / or chloride residues. With the involvement of an equally fluidly connected to the collecting pot drain pump which arrives in the collecting pot fresh water is pumped, resulting in a cleaning of the pump housing of the drain pump and the fluidic connection between collecting pot and drain pump.

The embodiment of the invention allows a complete flushing of the lye and / or chloride route, ie the circulation pump, the collecting pot and leading from the circulation pump via the collecting pot leading to the drain line path, so that there located residual fluids can be expelled as much as possible, so that no unwanted alkali and / or Chloridverschleppung takes place in a subsequent washing program. In this case, an admission of the circulation pump with fresh water via the suction side takes place, whereby a flushing does not take place without pumpless, but rather in pump operation. That of the circulation pump on the pressure side dispensed fresh water is not delivered via the spray nozzles of the pump connected to the circulation pump spray arm, but via a leakage opening. In the case of purging, there is thus no intended operation of the spray arm, as occurs in the case of a rinsing program. In this case, the leakage opening is either provided by the spray arm or it is formed in the fluidic connection between the circulation pump and the spray arm. Alternatively, it is also possible to provide a plurality of leakage openings, in which case both the spray arm and the fluidic connection between the circulation pump and the spray arm can have corresponding leakage openings.

The embodiment of the invention is compared to the prior art construction according to the EP 2 759 244 B1 especially with regard to two aspects of advantage. On the one hand, the machine-side construction costs are reduced. It is only needed a fresh water inlet, which is formed on the suction side of the circulation pump. About this fresh water inlet is a supply of fresh water both in Spülprogrammfall and for the purpose of flushing by the method according to the invention instead. In that respect, in departure from the construction after the EP 2 759 244 B1 no additional cable routes including appropriate locking and / or actuators needed. Furthermore, the formation of a leakage opening according to the invention does not require any additional conduction paths and / or the like. It is achieved as an overall simplified design of the dishwasher, which simplifies the production and thus reduced.

On the other hand, the embodiment according to the invention enables a process implementation that is more effective in the flushing result. Because the construction according to the invention requires that fresh water introduced into the circulation pump on the suction side is pumped via the leakage opening into the flushing space and / or the collecting pot, depending on whether the leakage opening is provided by the spray arm or formed in the fluidic connection between the circulation pump and the spray arm. In any case, however, causes the discharge of fresh water through the leakage opening that the collecting pot is not acted upon in contrast to the configuration of the prior art via a lateral access with fresh water, but with the interposition of the leakage opening from above. This leads advantageously to the fact that due to the density differences between fresh water and residual water increased compared to the prior art displacement of residual water through the Introduced fresh water results. This, too, contributes overall to an improved process result.

At the beginning of the process implementation according to the invention, a suction-side loading of the circulation pump with fresh water from the fresh water discharge point takes place. At the same time with the Frischwasserbeaufschlagung or this time-delayed switching on the circulation pump. It is preferred to turn on the circulation pump before the fresh water inlet, in order to avoid that parts of the introduced fresh water can flow into the collecting pot when the circulating pump is switched off

The introduced fresh water is sucked in when the circulating pump and spent on the pressure side of the circulation pump, where it enters the fluidic connection to the spray arm, wherein the spray arm is preferably the lower spray arm. This is because the fluidic connection to the lower spray arm is guided by the collecting pot.

According to a first alternative of the invention, the spray arm on the leakage opening. According to this embodiment, the fluidic connection between circulation pump and spray arm abandoned fresh water passes to sprüharmseitigen leakage opening, where it exits and then accumulates on the bottom side of the washing, from where it flows into the collecting tank connected fluidically to the washing. Here it comes to the displacement of the possibly still in the collecting pot residual water or to a mixing of the fresh water with the residual water. Preferably, before or at the latest when switching on the circulation pump and the drain pump is turned on, so that takes place with or at the latest with the promotion of the circulating pump of fresh water pumped into the collecting pot pumping out of the lye and / or chloride contaminated residual water.

According to an alternative embodiment it is provided that the leakage opening is provided by the fluidic connection between the circulation pump and the spray arm. According to this embodiment, no loading of the spray arm takes place. The guided through the collecting pot fluid connection between the circulation pump and spray arm gives the introduced fresh water much more about the leakage opening, before it can reach the spray arm. It therefore finds without fluidic interposition of the washing container direct application of the collecting pot with fresh water instead. In the manner described above can then be pumped by switching on the drain pump located in the collecting pot under certain circumstances residual water. Preferably, the fluidic connection between the circulation pump and spray arm through the collecting pot, in particular along the collecting head axis, guided, wherein the leakage opening is arranged in the region of the collecting pot, in particular within or above the collecting pot.

The construction according to the invention is suitable not only in the previously described manner to effect a flushing of the alkali and / or chloride range. Rather, the flow circuit provided by the design can also be used to heat up the fresh water introduced into the dishwasher as optimally as possible, for example by means of a heater integrated in the circulating pump. In this case, pumping by means of the drain pump would not take place. Rather, a continued circulation of the introduced fresh water would be done by means of the circulation pump until the desired target temperature is reached.

The inventively provided leakage opening closes rinsing liquid depending. It is thus possible to distinguish between a flushing operation on the one hand and a flushing program operation on the other hand. In the purging operation, the circulation pump is operated at low speed, for example at idle speed. At such a low speed, only a small pump pressure sets in, which keeps the leakage opening open. It can then be done in the manner described above, a delivery of fresh water through the leakage opening. During a wash program, the circulation pump operates at a higher speed, resulting in a higher pump pressure. As a result, the rinsing liquor pressure-dependent leakage opening closes, so that an intended rinsing program can be carried out without an outflow of rinsing liquor taking place via a still open leak opening.

In this context, it is proposed according to a further feature of the invention that the spray arm has an inlet opening for wash liquor, in which a bearing bush is inserted axially displaceable, wherein the bearing bush provides a sealing surface which cooperates with a peripheral surface surrounding the inlet opening contact surface, wherein the spray arm and the bushing, leaving a the Leakage opening providing gap space between the sealing surface and contact surface spaced from each other can be arranged.

According to this embodiment, a bearing bush inserted in an inlet port of the spray arm is provided. The spray arm and the bearing bush are arranged axially displaceable relative to each other. In the final assembled state, the bearing bush is fixed in position at the end of a pipe socket. The spray arm can therefore move in the axial direction in relation to the bearing bush and thus also to the pipe socket on which the bearing bush is arranged.

With appropriate pressure of reaching over the pipe socket in the spray arm fresh water, the spray arm raises in relation to the bearing bush in the height direction, whereby sealing and abutment surface are pressed together. This leads to a sealing of the spray arm relative to the bearing bush, so that an unwanted escape of wash liquor between bearing bush and spray arm is prevented. The rinse liquor dispensed to the pipe stub and thus also to the spray arm terminates as intended via the nozzles provided by the spray arm, so that an intended washing program can be run through.

At low rinsing pool pressure, the spray arm moves following the weight force in relation to the bearing bush down, so that due to the then spaced arrangement of bearing bush and spray arm, a gap between the sealing surface on the one hand and contact surface on the other hand arises. This gap space provides the previously described leakage opening, so that flushing liquor introduced via the pipe socket can flow through the gap between the sealing surface and the contact surface and can flow away in the direction of the collecting pot.

In a structurally simple way so the formation of a rinsing flipper pressure dependent closing leakage opening is realized.

The bushing has according to a further feature of the invention, a sleeve-shaped socket body and a einendseitig arranged thereon and the bush body surrounding surrounding radial web, the sprüharmabgewandt provides the sealing surface, wherein the radial web has an end-side outer contour, which is formed deviating from the circular shape.

The deviating from the circular configuration of the outer contour of the radial web of the bearing bush avoids unwanted seals, whereby the formation of a leakage opening is ensured at a correspondingly low rinsing liquid pressure.

In this case, the outer contour of the radial web can be formed polygonal according to a further feature of the invention, wherein slot-shaped recesses are preferred. Other geometrical configurations are also conceivable, whereby according to the invention it is only important to avoid unwanted end-side seals between the bearing bush and the spray arm for the purpose of forming a leakage opening.

According to a further feature of the invention it is provided that the bearing bush cooperates with a union nut for placement on a pipe socket, wherein the union nut has sprüharmseitig recesses and / or depressions. These over-nut-side recesses and / or depressions also serve to be able to reliably provide a flow path for forming a leakage opening with a correspondingly low rinsing fluid pressure.

In an alternative embodiment of the invention, it is provided that the spray arm is arranged at one end of a pipe socket, which has two mutually axially displaceable pipe sections, each having a formed in the respective pipe wall breakthrough, the pipe sections in their axial alignment with each other to form an at least partially and the leakage opening providing coverage of the two openings can be arranged.

According to this embodiment, a pipe socket guided through the collecting pot is provided, which is part of the fluidic connection between the circulating pump and the spray arm. In this case, the pipe socket is designed to be telescopic and has two pipe sections, which are arranged axially displaceable to each other. At a corresponding rotational speed of the circulating pump, that is, with a corresponding flushing liquor pressure, these two axially displaceable pipe sections are separated in the vertical direction. When the pressure drops, the upper of the two pipe sections moves back downwards following the weight force.

The two telescopic pipe sections have openings in the respective pipe wall. In the extended state of the two pipe sections are the

Breakthroughs were not brought into overlap. In this position, the water supplied to the pipe socket is fed to the spray arm in a conventional manner.

At a rinsing pool pressure which is below a certain limit value, the upper of the two pipe sections follows the weight force in relation to the lower pipe section downwards, as a result of which the openings provided by the pipe sections overlap. This creates a leakage opening through which leaked fresh water through the pipe socket and can flow directly into the collecting pot. The leakage opening is located in the region of the collecting pot, in particular within or immediately above the collecting pot.

This alternative embodiment proves constructively very simple in an advantageous manner, and it is also less susceptible to interference.

According to a further feature of the invention it is provided that the circulation pump is connected to the collecting pot under fluidic interposition of a suction nozzle providing a pipe socket. This pipe socket represents the suction port for the circulating pump. According to a particular feature of the invention, it is now provided that the pipe socket connected in the fluidic connection between the circulation pump and the collecting pot has the fresh water inlet. In this case, the fresh water inlet can be formed as formed on the pipe socket connection piece on which the line is attached to the fresh water supply. This type of structural design proves to be particularly easy to manufacture since the collecting pot together with the pipe socket and arranged thereon connecting piece can be designed as a one-piece injection-molded part.

It is provided according to a further feature of the invention, an opening into the collecting pot bypass line to the pipe socket. This bypass line is used to equalize the pressure during the intended implementation of a washing program.

At the beginning of a washing program, the dishwasher is supplied in a conventional manner via the fresh water inlet fresh water. As soon as the amount of fresh water required for proper pump operation is introduced into the dishwasher, the circulating pump is put into operation, as a result of which there is a proper fresh water circulation within the dishwasher Dishwasher is coming. During such a circulation operation, it comes on the suction side of the circulation pump to form a negative pressure. Since the fresh water inlet is formed on the suction mouth side of the circulation pump, such a negative pressure formation leads to the circulation pump drawing air from the fresh water supply line. This interferes with the proper operation of the circulation pump and should therefore be avoided. Therefore, according to the invention, a bypass line connected to the collecting pot is provided. In the vacuum case so a suction of air from the fresh water supply line is avoided.

Fig. 1

in schematischer Ansicht eine erfindungsgemäße Geschirrspülmaschine;

Fig. 2

in schematischer Prinzipdarstellung eine erfindungsgemäße Geschirrspülmaschine;

Fig. 3

in schematischer Prinzipdarstellung eine erste Ausführungsform der erfindungsgemäßen Geschirrspülmaschine;

Fig. 4

in schematischer Prinzipdarstellung eine zweite Ausführungsform der erfindungsgemäßen Geschirrspülmaschine;

Fig. 5

in teilgeschnittener Seitenansicht die Anordnung eines Sprüharms an einem Rohrstutzen gemäß erster Ausführungsform nach Fig. 3;

Fig. 6

eine Detailansicht gemäß einem Ausschnitt nach Fig. 5;

Fig. 7

eine Detailansicht gemäß einem Ausschnitt nach Fig. 6;

Fig. 8

in schematischer Perspektivdarstellung ausschnittsweise einen Sprüharm;

Fig. 9

in schematischer Perspektivdarstellung eine Überwurfmutter;

Fig. 10

in schematischer Perspektivansicht eine Lagerbuchse;

Fig. 11

in schematischer Seitenansicht die Ausbildung eines Rohrstutzens gemäß der zweiten Ausführungsform nach Fig. 4 in einer ersten Stellung; und

Fig. 12

in schematischer Seitenansicht die Ausbildung eines Rohrstutzens gemäß der zweiten Ausführungsform nach Fig. 4 in einer zweiten Stellung.

Further features and advantages of the invention will become apparent from the following description with reference to FIGS. Show

Fig. 1

in a schematic view of a dishwasher according to the invention;

Fig. 2

in schematic schematic representation of a dishwasher according to the invention;

Fig. 3

in schematic schematic representation of a first embodiment of the dishwasher according to the invention;

Fig. 4

in schematic schematic representation of a second embodiment of the dishwasher according to the invention;

Fig. 5

in a partially sectioned side view of the arrangement of a spray arm on a pipe socket according to the first embodiment according to Fig. 3 ;

Fig. 6

a detailed view according to a section to Fig. 5 ;

Fig. 7

a detailed view according to a section to Fig. 6 ;

Fig. 8

a schematic perspective view of a fragmentary spray arm;

Fig. 9

in a schematic perspective view of a union nut;

Fig. 10

in schematic perspective view of a bearing bush;

Fig. 11

in a schematic side view of the formation of a pipe socket according to the second embodiment according to Fig. 4 in a first position; and

Fig. 12

in a schematic side view of the formation of a pipe socket according to the second embodiment according to Fig. 4 in a second position.

Fig. 1 can be seen in a purely schematic representation of a dishwasher 1 according to the invention.

The dishwasher 1 has a housing 2, which accommodates, inter alia, a washing container 3. The washing container 3 in turn provides a washing compartment 4, which serves in the intended use of the inclusion of items to be cleaned.

For loading of items to be cleaned with rinse liquor is a spray device 5, which is arranged within the washing container 3. Preferably, such a spraying device 5 has spray arms 6 and 7, which are each arranged rotatable within the washing container 3. In the exemplary embodiment shown, the spray device 5 has an upper spray arm 6 and a lower spray arm 7. Typically, a generic dishwasher has three spray arms, namely an upper and a lower spray arm and a central spray arm.

The rinsing container 3 is accessible to the user via a feed opening 8 which can be closed in a fluid-tight manner by means of a pivotally mounted dishwashing door 9.

The washing container 3 or the washing compartment 4 provided by the washing container 3 opens into a detail in FIG Fig. 5 a collecting pot 10 shown in detail. At this collecting pot 10, a circulating pump 11 and a drain pump 12 are each connected fluidically. For this purpose, a fluidic connection 15 and between the drain pump 12 and the collecting pot 10, a fluidic connection 13 are formed between the circulating pump 11 and the collecting pot 10.

The circulation pump 11 is connected via corresponding fluidic connections 16 and 17 to the spray arms 6 and 7 of the spray device 5, wherein the fluidic connection 16 of the circulation pump 11 to a lower Spray arm 7 and the fluidic connection 17 of the circulation pump 11 leads to an upper spray arm 6. Naturally, at least one further spraying element not shown here, in particular another upper one, for instance a middle spraying arm, may be present in a manner known per se, which may be connected to the circulating pump 11 via a separate supply line.

In the intended use case can be carried by the circulation pump 11, a charge of rinsing liquid either leading to the lower spray arm 7 fluidic connection 16 or leading to the upper spray arm 6 fluidic connection 17.

After completing a wash program, the spent wash liquor is pumped out by means of the drain pump 12, for which purpose the drain pump 12 is connected to a line 14, which typically opens into the public sewerage system and is discharged via the wash liquor consumed in correspondence with the arrow 18.

Fig. 2 lets recognize the further structure of the dishwasher 1 according to the invention. Thereafter, a fresh water delivery point 26 is provided, which may for example be an access to the public water network, even with the interposition of a machine-side water tank and / or the like. It is crucial that a supply of fresh water via the fresh water discharge point 26 takes place with the interposition of the fresh water line 21. In this case, a check valve 22 and a fresh water softening device 24 are further provided in the embodiment shown. In the intended use case, therefore fresh water flows from the fresh water discharge point 26 via the line 25 to Frischwasserenthärtungseinrichtung 24 and from there via the line 23 to the valve 22, which separates the line 23 from the fresh water line 21. In the intended use case, the check valve 22 is opened, so that can get into the fresh water line 21 via the above-described line path fresh water.

The fresh water line 21 is divided into a first feed line 49 and a second feed line, which constitutes a bypass line 27 described in more detail below. The first supply line 49 opens into the fluidic connection 15 between collecting pot 10 and circulating pump 11, that is, the fresh water inlet 20 is the suction side of the circulation pump 11 is formed. In normal operation, therefore, there is a direct admission of the circulation pump 11 with fresh water via the fresh water line 21 or the first supply line 49 connected to the fresh water line 21.

At the beginning of a washing program, the circulating pump 11 is fed via the supply line 49 fresh water. Once sufficient fresh water has been supplied, the circulation pump 11 is put into operation and there is a circulation of fresh water supplied, wherein the circulating pump 11 via the fluidic connection 17, in particular selectively or alternately, either the upper spray arm 6 or via the fluidic connection 16th supplies the lower spray arm 7 with fresh water. Preferably, as a further alternative, a third, in particular middle, spray arm, not shown, can additionally be supplied with fresh water via a further supply line. The guided in this way in the washing tank 3 fresh water is a Spülgutreinigung and collects as a rinsing liquor in the collection pot 10, from where the rinse liquor is then passed through the fluidic connection 15 again to the circulation pump 11 and is kept in circulation.

After expiration of a properly carried out rinsing program are in particular in the collecting pot 10 and in the housing of the circulating pump 11 lye and chloride residues, which must be removed in order to avoid carryover to a subsequent program step and / or a subsequent wash program. According to the invention it is therefore provided that a rinsing takes place, whereby the lye and / or chloride route is cleaned, that is, in particular the collecting pot 10 and the housing of the pumps 11 and 12 are freed of lye and / or chloride residues.

The rinsing according to the invention provides that the dishwasher 1 is supplied with fresh water from a fresh water delivery point 26 in the manner already described. In this case, the fresh water of the circulation pump 11 is placed on the suction mouth side and pumped there before by means of the circulation pump 11 in the flow-technically connected to the circulation pump 11 collecting pot 10. At the same time, the flow pump 12 connected to the collecting pot 10 is at least temporarily operated at the same time as the circulating pump 11, so that it accumulates in the collecting pot 10 Mixed water is pumped out of fresh and residual water.

Such flushing is carried out with a fresh water amount of, for example, 150 ml. Such a small amount of water is already sufficient to liberate the alkali and / or chloride as far as possible from unwanted alkali and / or chloride residues. Alternatively, it can be flushed through with more fresh water and / or the flushing step can be repeated several times, for example, five times, resulting in a total fresh water consumption of 750 ml at 150 ml per wash cycle.

One particular advantage of the process implementation according to the invention is, inter alia, that only a charge of the liquor and / or chloride route to be purified takes place. A Frischwasserbeaufschlagung of the washing compartment 3 and / or there possibly located dishes as this takes place in a conventional program sequence during the intermediate flushing, does not take place. This has the advantage that there is virtually no heat leakage from the dishwasher 1, so that less energy is needed to reheat rinse liquor in subsequent rinse program steps. The method according to the invention makes it possible to completely dispense with a conventional rinsing program step of intermediate rinsing, but nevertheless to ensure that undesired alkali and / or chloride residues are removed and are not carried off into a subsequent rinsing program step and / or a subsequent rinsing program.

For the transfer of fresh water in the collecting pot 10 for the purpose of flushing the leach and / or chloride range a leakage opening 29 is provided according to the invention, which is open to the washing compartment 4 and / or the collecting pot 10 and closes the rinsing liquid depending. The Figures 3 and 4 In each case, an embodiment can be seen, which illustrates the formation of such a leakage opening 29.

According to the first embodiment according to Fig. 3 In the flushing case fresh water from the circulation pump 11 passes through the fluidic connection 16, which runs along the collecting head axis, to the spray arm 7. The fresh water supplied to the fluidic connection 16 but not in the intended manner on the Spray arm 7, but on the provided from the spray arm 7 leakage opening 29th issued. From there, the fresh water then passes in correspondence with the arrows 28 in the collecting pot 10, which leads in a manner already described to a displacement of residual water located there or to a mixing with the residual water located there.

A second embodiment is in Fig. 4 shown. Thereafter, it is provided that a pipe socket 39, which is part of the fluidic connection 16, the leakage opening 29 provides, is discharged via the in the intended use case in correspondence of the arrow 28 of the circulating pump 11 promoted fresh water. Also in this respect it comes to a expulsion of befindlichem in the collecting pot 10 residual water or to a mixture of fresh water and residual water.

The structural design of the embodiment according to Fig. 3 is in the rest FIGS. 5 to 10 shown in more detail.

The fluidic connection 16 between the circulation pump 11 and the lower spray arm 7 includes, inter alia, a pipe stub 39, as can be seen from the illustration Fig. 5 results. In the intended use case fresh water passes through the pipe socket 39 to the lower spray arm. 7

The lower spray arm 7 has a main body 30 on which two Sprüharmäste 31 are arranged, as shown in particular the illustration Fig. 8 lets recognize. The base body 30 provides an inlet opening 32, via which rinsing liquor circulated in the intended use case by the circulating pump 11 flows into the spray arm 7.

For the arrangement of the spray arm 7 on the pipe socket 39 is a union nut 40, as in particular the illustration after Fig. 5 lets recognize. In this case, the union nut 40 cooperates with a bearing bush 33 which is inserted into the inlet opening 32 of the main body 30 of the lower spray arm 7.

Fig. 10 lets see the bushing 33 in a detailed view. As can be seen from this illustration, the bearing bush 33 has a bushing body 36. This bears at one end a circumferentially formed radial web 37. This radial web 37 contributes Referring to the drawing plane Fig. 10 on the underside a sealing surface 34, which is spray-spray-facing away in the final assembled state.

The radial web 37 has an end-side outer contour 38, which is deviating from the circular shape. According to the illustrated embodiment according to Fig. 10 37 notch-like recesses 26 are formed on the outside of the radial web.

In the final assembled state, the bearing bush 33 is slidably inserted into the inlet opening 32 of the lower spray arm 7 in the axial direction, wherein the bearing bush 33 is fixed in position on the pipe socket 39 by means of the cap nut 70. The axial displaceability between bushing 33 and lower spray arm 7 thus causes the lower spray arm 7 in the height direction 47, with respect to the plane of the drawing, for example Fig. 5 can move up or down in relation to the bearing bush 33 and in relation to the pipe socket 39.

If the lower spray arm 7 is due to the force of gravity on the union nut 40, the radial web 37 of the bearing bush 33 and the associated mating contour of the lower spray arm 7 are spaced apart leaving a gap space. This situation arises in particular from a synopsis of the FIGS. 6 and 7 ,

The resulting due to the spaced arrangement of bushing 33 on the lower spray arm 7 gap space represents the leakage opening 29 of the invention. This leakage opening 29 causes fresh water conveyed into the lower spray arm 7 in accordance with the in the FIGS. 6 and 7 outlined arrows and according to the arrows 28 after Fig. 3 can flow into the collection pot 10.

If the circulating pump 11 is operated in the proper flushing operation with sufficient speed, it promotes fresh water with a correspondingly high pressure through the pipe socket 39 in the lower spray arm 7. In such a pressurization, the lower spray arm 7 is moved against the force acting on it upward, that is relative to the bearing bush 33, which is arranged by means of the union nut 40 securely on the pipe socket 39. As a result of such a movement of the lower spray arm 7 is provided by the lower spray arm 7 contact surface 35 at the corresponding thereto formed sealing surface 34 of the bearing bush 33 with the Result is that the leakage opening 29 is closed. During the implementation of a proper washing program in the lower spray arm 7 introduced rinsing solution can therefore not be discharged through the leakage opening 29, since this is closed due to the pressure-related process of the lower spray arm 7 upwards.

Fig. 9 lets in a detailed view of the union nut 40 recognize. As can be seen from this illustration, the union nut 40 has recesses 41. These recesses 41 and the recesses 46 provided by the bearing bush 33 support the formation of a leakage opening 29 according to the invention, as can be seen in particular from the detail views according to FIGS FIGS. 6 and 7 results.

The structural implementation of the embodiment according to Fig. 4 you can do that FIGS. 11 and 12 remove. As can be seen from these illustrations, the pipe socket 39 has two pipe sections 42 and 43, which are telescopically displaceable in the axial direction. Both pipe sections 42 and 43 each have an opening 44 and 45. With appropriate pressurization of the lower spray arm 7, as in Fig. 12 is shown, the lower spray arm 7 is moved so far up that the openings 44 and 45 are not at least partially congruent to each other. Meanwhile, the lower spray arm 7 is moved downward in correspondence with the weight force acting on it, like this Fig. 11 can recognize, so come from the pipe sections 42 and 43 respectively provided openings 44 and 45 at least partially in coverage, whereby the leakage opening 29 according to the invention is formed.

As the Figures 3 and 4 Furthermore, let the collection pot 10 a pipe socket 48 ready. At this pipe socket 48, the circulation pump 11 is connected to the suction side. The pipe socket 48 is therefore part of the fluidic connection 15 between collecting pot 10 and circulating pump 11th

The pipe socket 48 is equipped with a connection piece not shown in the figures. At these the first supply line 49 is connected, which opens into the fresh water line 21. In normal operation, the circulation pump 11 suction mouth fresh water can be given by fresh water via the lines 21 and 28 and the connecting piece in the serving as a suction mouth 19 pipe socket 48 passes. In the circulation operation of a purposely operated wash program, a negative pressure is created in the pipe socket 48. This leads to an intake of standing in the fresh water line 21 air, which interferes with the proper operation of the circulation pump 11. To avoid this, the already mentioned at the beginning bypass line 27 is provided, as can be seen in particular from the illustration Fig. 2 results. Via this bypass line 27, a pressure equalization takes place or can be sucked in the collecting pot 10 befindliches rinse water.

reference numeral

1

dishwasher

2

casing

3

rinse tank

4

Wash cabinet

5

spraying

6

Upper spray arm

7

Lower spray arm

8th

loading port

9

rinsing chamber

10

collecting pot

11

circulating pump

12

drain pump

13

Fluidic connection

14

management

15

fluidic connection

16

fluidic connection

17

fluidic connection

18

arrow

19

saugmund

20

Fresh water inlet

21

Fresh water pipe

22

check valve

23

management

24

Frischwasserenthärtungseinrichtung

25

management

26

Fresh water discharge point

27

bypass line

28

arrow

29

leakage opening

30

body

31

Sprüharmast

32

inlet port

33

bearing bush

34

sealing surface

35

contact surface

36

bush body

37

radial web

38

outer contour

39

pipe socket

40

Nut

41

recess

42

pipe section

43

pipe section

44

breakthrough

45

breakthrough

46

recess

47

height direction

48

pipe socket

49

feed pipe

Claims (15)

Dishwasher, in particular domestic dishwasher, with a washing compartment (4) providing a washing container (3), which serves to receive items to be cleaned, a collecting pot (10) into which the washing compartment (3) opens, one within the washing compartment (3) arranged Spray arm (7) for loading of items to be cleaned with rinsing liquor, and a circulating pump (11), wherein the spray arm (7) to the circulation pump (11) is fluidly connected,
characterized,
in that the fluidic connection (16) between the circulating pump (11) and the spray arm (7) and / or the spray arm (7) opens a leakage opening (29) which opens to the flushing space (4) and / or the collecting pot (10). having. Dishwasher according to claim 1,
characterized,
in that the spray arm (7) has an inlet opening (32) for wash liquor into which a bearing bush (33) is axially displaceable, wherein the bearing bush (33) provides a sealing surface (34) which surrounds the inlet opening (32) circumferentially Contact surface (35) cooperates, wherein the spray arm (7) and the bearing bush (33) while leaving a leakage opening (29) providing gap space between the sealing surface (34) and contact surface (35) spaced from each other can be arranged. Dishwasher according to claim 2,
characterized,
in that the bearing bush (33) has a sleeve-shaped bushing body (36) and a radial web (37) which surrounds the bushing body (36) and surrounds the sealing surface (34), the radial web (37) providing an end-side outer contour (FIG. 38) which is deviating from the circular shape. Dishwasher according to claim 3,
characterized,
that the outer contour (38) of the radial rib (37) is configured polygonal. Dishwasher according to claim 3 or 4,
characterized,
that the outer contour (38) of the radial rib (37) has slot-shaped recesses (46). Dishwasher according to one of the preceding claims 2 to 5,
characterized,
in that the bearing bush (33) interacts with a union nut (40) for arrangement on a pipe socket (39), wherein the union nut (40) has recesses (41) and / or depressions on the spray arm side. Dishwasher according to claim 1,
characterized,
that the spray arm (7) a pipe socket (39) ends disposed, the two mutually axially displaceable pipe sections (42, 43), each having a formed in the respective tube wall opening (44, 45), wherein the pipe sections (42, 43) in their axial alignment with each other to form an at least partially and the leakage opening (29) providing coverage of the two openings (44, 45) can be arranged. Dishwasher according to one of the preceding claims,
characterized,
in that the circulating pump (11) is connected to the collecting pot (10) by means of fluidic interposition of a pipe socket (48) providing a suction mouth (19). Dishwasher according to claim 8,
marked by
a fresh water inlet (20), the suction mouth side of the circulating pump (11) is formed. Dishwasher according to claim 8,
characterized,
that the pipe socket (48) having the fresh water inlet (20). Dishwasher according to claim 10,
characterized,
in that a bypass line (27) opening into the collecting pot (10) is provided for the pipe socket (48). Dishwasher according to claim 11,
characterized,
that a fresh water line (21) for connection to a fresh water delivery point (26) is provided, which on the machine side to a first supply line (49) and is connected to a second supply line, wherein the first supply line (49) opens into the fresh-water inlet (20) and the second supply line forms the bypass line (27). Method for introducing fresh water into a dishwasher (1), in particular a dishwasher (1) according to one of the preceding claims, in which fresh water is supplied to the dishwasher (1) from a fresh water discharge point (26),
characterized,
that the fresh water of a circulating pump (11) on the suction side, preferably Saugmundseitig abandoned and pumped from there by means of the circulation pump (11) in a fluidically connected to the circulation pump (11) collecting pot (10), wherein the circulating pump (11) abandoned fresh water the Collection pot (10) via a to a flushing chamber (4) and / or the collecting pot (10) open, rinsing liquid pressure dependent closing leakage opening (29) in a spray arm (7) and / or in a fluidic connection (16) between the circulating pump (11 ) and a spray arm (7) is supplied. Method according to claim 13,
characterized,
that one of the collecting pot 10 fluidly connected drain pump (12) at least temporarily operated simultaneously with the circulation pump (11) and in the collecting pot (10) accumulating mixed water from fresh and Remaining water is pumped out. Method according to claim 13 or 14,
characterized,
that the circulation pump (11) is operated at an idle speed.

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