EP3146883A1 - Dishwasher, in particular household dishwasher - Google Patents

Abstract

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, with a flushed container of the same fresh water tank and at least partially passed through the fresh water tank pipe (23) formed as a shaft pipe and both the input side and the output side of the washing container is connected fluidly, wherein the shaft pipe (23) in the pipe longitudinal direction (30) at least partially extending and adjacent wave crests (28) fluidly interconnecting air duct (31) provides.

Description

The invention relates to a dishwasher, in particular in the embodiment as a domestic dishwasher, with a washing compartment providing a washing compartment, which serves to receive items to be cleaned, with a sump adjacent fresh water tank and at least partially passed through the fresh water tank pipe formed as a wave pipe and is fluidly connected to both the input side and the output side to the washing compartment.

Dishwashers in general and household dishwashers in particular are well known in the prior art, so it does not require a separate documentary evidence at this point.

Generic dishwashers typically have a rinse container that provides a rinse compartment. This is the user side accessible via a feed opening, which is fluid-tightly closed by means of a pivotally mounted flushing door. In the intended use case, 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 rinsing liquor, the dishwasher has a spray device in the interior of the washing container. This spraying device generally provides rotatably mounted spray arms, with typically two or three such spray arms being provided. In the intended use case, a loading of the items to be cleaned with rinse liquor by means of rotating spray arms.

The rinsing solution dispensed by the spray collects in a collecting pot of the washing. This is connected to a circulation pump on the one hand and to a drain pump on the other. 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.

From the prior art it is known to equip dishwashers with a fresh water tank, which is for example juxtaposed to the washing. Such an embodiment is for example from the EP 2 543 305 A1 known.

The construction after the EP 2 543 305 A1 provides a drain pipe for the discharge of waste water, which is passed through the fresh water tank. After completing a washing program, the rinsing liquor, which is no longer required, is pumped off as waste water and guided through the drainage pipe arranged in the fresh water tank. It can thus come to a heat transfer from still comparatively warm wastewater to the still comparatively cold fresh water. In this case, the drainage pipe is designed to achieve the largest possible heat transfer surface as a wave pipe.

Another device for the recovery of heat energy is from the DE 39 01 169 A1 known. According to this pre-known construction a pipe is laid by a sump adjacent to the fresh water tank, which is connected to the feed with rinsing water to a circulation pump. In order to realize the longest possible laying route, the pipeline is arranged meandering running within the fresh water tank.

An alternative device for heat recovery is from the EP 2 309 052 B1 known. According to the construction described here, a heat transfer device is used, which includes, inter alia, a heat pump and / or a thermoelectric generator, which allows waste water to extract heat in order to transfer this to run in a closed Frischwasserumwälzkreislauf fresh water.

Although the above-described constructions have proven themselves in everyday practice, there is room for improvement. In particular, a simplified construction with simultaneously improved operational safety is desired.

It is therefore an object of the invention to propose a dishwasher of the type mentioned, which provides a simplified construction in terms of heat recovery with improved reliability.

To solve this problem, the invention proposes a dishwasher of the type mentioned above, which is characterized in that the shaft pipe provides an at least partially extending in the tube longitudinal direction and adjacent wave crests aerodynamically interconnecting air duct, and / or that the shaft pipe in the pipe longitudinal direction at least partially over a partial area is formed wave-free in the circumferential direction, and / or that the shaft pipeline has an at least partially helically extending wave contour around an axis in the tube longitudinal direction.

In order to increase the heat transfer area provided by the pipeline for the purpose of increased efficiency, it is known from the prior art to form the pipeline as a shaft pipeline. According to this embodiment, the lateral surface of the pipe is formed corrugated in the tube longitudinal direction, thus has waves which are rotationally symmetrical about a pipe axis extending in the tube axis, so that wave peaks and troughs alternate each other in the tube longitudinal direction. The provided by the pipe pipe surface can thus be significantly increased in contrast to a wave-free pipeline, which allows for faster use of heat transfer and higher efficiency in the intended use case.

However, the wave-shaped design of the pipeline is not free of disadvantages.

A first disadvantage is that air bubbles located in the interior of the pipeline can settle on the inside of the convex wave crests. As a result, an insulating cushion is formed between the rinsing liquid passed through the wave pipe, on the one hand, and the surface of the pipe in the region of the wave crests, on the other hand. As a result of such bubble setting, the efficiency of heat transfer decreases as well as the rate at which heat transfer occurs so that the effect of improved heat transfer actually achieved with the wave tube design does not occur or only greatly diminishes.

The problem of bubble accumulation in the wave crests of the wave pipeline particularly occurs when the wave pipeline in the fresh water tank laid meandering. This is because each meander at least partially extends at least partially horizontally. Even in the case of a feed of the pipeline with flushing liquid, air in the pipeline remains in the wave crests of these meandering sections extending essentially horizontally. This is because rinsing fluid introduced into the pipeline depresses the pipeline from below into the wave crests, but the air stored there can not escape. As a result, the air bubbles are trapped in the wave crests and form a heat transfer dissipative isolation between the rinsing liquid and the tube surface.

To remedy this situation, it is proposed with the invention in accordance with a first aspect that the shaft pipeline provides an air duct which connects in fluid communication with one another in the tube longitudinal direction and adjacent wave crests. It is thus advantageously allowed that any air bubbles located in the wave crests can flow out in the case of charging, through the air duct, which connects flow-wise in the tube longitudinal direction adjacent wave crests. In the loading case, the pipeline, including the air duct provided by it completely fills with rinsing liquid, so that heat insulation is completely avoided by remaining air bubbles, which allows a fast heat transfer at the same time high efficiency in the intended use case.

The inventively provided air duct allows it therefore completely remove residual air located in the pipeline during operation, whereby the entire provided by the shaft pipe heat transfer surface is available. Thus, the construction of the invention provides improved reliability, and this without additional design effort.

The wave-shaped configuration of the pipeline brings, in particular with a meandering installation of the pipeline, the further disadvantage that impurities can accumulate in the sections of the wave peaks pointing downwards in the vertical direction. This disadvantage has an effect, in particular, on substantially horizontally extending meandering sections. The clogging of the wave crests with impurities is disadvantageous for two reasons. On the one hand it can lead to an unwanted contamination of the pipe come passed rinsing liquid. This has a disadvantageous effect, in particular, when the rinsing liquor passed through the pipeline is to be used even further in subsequent rinsing programs. On the other hand, it is disadvantageous that as a result of a clogging of the wave crests, a kind of insulating pad is formed, which impairs the actually desired heat transfer between the rinsing fluid passed through the pipeline and the fresh water stored in the fresh water tank.

As a result, the clogging of the crests with impurities results in insulation, which degrades the heat transfer efficiency as well as the rate at which heat transfer occurs.

To solve the problem set out above, it is therefore proposed according to a second aspect of the invention that the shaft pipe is formed in the tube longitudinal direction at least in sections over a portion of the circumferential direction wave-free.

The corrugated pipe is thus formed wave-free in the vulnerable to the accumulation of contaminants portions. "Wave-free" means a tubular jacket surface, which is designed to be substantially smooth at least on the inside, but preferably both on the inside and on the outside. Although the smooth design of the tubular jacket surface leads to a reduction in the total available heat transfer area in the corresponding subregions, this disadvantage is more than offset by the advantage that the adhesion of impurities with the result of the formation of an insulating layer is avoided.

Constructively, the undulating portion is formed by the waves in these parts expire, that is, go over into the lateral surface without formation of wave crests and troughs. It is created in this way a lying in the circumferential direction portion which is wave-free, therefore smooth. In this case, this undulating partial region preferably extends at least in sections over a longer section in the tube longitudinal direction.

Both the part of the invention designed to be free of waves, on the one hand, and the design of the air duct, on the other hand, each provide improved operational reliability, and this without any additional design effort. These are more preferred Way provided both an air duct of the type described above as well as a wave-free trained portion of the prescribed type in combination.

It is provided according to a further feature of the invention that the undulating portion in the circumferential direction and the air duct are formed opposite to each other. Particularly in the case of substantially horizontally extending shaft pipe sections, the air duct is typically formed on an upper pipe wall in the installation position of the shaft pipe, whereas the undulating portion is located on a lower pipe wall of the shaft pipe in the installed position. According to this constellation, the advantages achieved with the formation of an air duct on the one hand and the advantages achieved with a shaft-free part on the other can be achieved jointly.

In this case, the arrangement of the air duct on a top pipe wall in installation position is due to the fact that air bubbles settle above the liquid level of a rinsing liquid passed through the pipe. However, contamination sinks downwards following the gravitational force and will therefore prefer to settle on the inside of the lower pipe wall in the installation position. It is expedient to equip the lower pipe wall in the installation position with shaft-free subregions according to the invention.

In order to solve the problem set out above, it is also proposed according to a third aspect of the invention that the corrugated pipe has a wave contour that extends at least in sections helically about an axis in the pipe longitudinal direction. Accordingly, the waves in their wave contour are not rotationally symmetrical, but helical, i. on a helical helix.

This particular embodiment has the advantage that flushing liquid introduced into the shaft pipeline is set into a vortex movement, in correspondence with the helical wave contour, into a vortex movement about a tube axis extending in the tube longitudinal direction. As a result of this whirling movement, any adhesions, soiling and / or the like located on the inside of the shaft tube in the wave crests are entrained and rinsed out. This is because a higher flow velocity is formed by the vortex movement, so that acts on any adhesions, dirt and / or the like. A higher release force. The helical wave contour thus ensures that the thus caused vortex movement of the introduced rinse liquid leads to a kind of self-cleaning.

Another advantage of a swirl-shaped movement of the rinsing liquid is that, due to thermodynamic effects, always the warmest liquid layer always rests on the inside of the pipe wall. Thus, the heat transfer desired in the intended use case from the rinsing liquid to the fresh water contained in the fresh water container causes the rinsing liquid cools, with a temperature gradient with respect to the flow cross-section from outside to inside, with the outside is the most cooled liquid layer. If, as a result of the helically shaped wave contour, a swirling motion in the rinsing liquid occurs, this leads to thermal mixing of the individual liquid layers, as a result of which the warmer liquid layers are always conveyed outwards, which has a positive effect on the heat transfer efficiency.

With the embodiment according to the third aspect of the invention is thus ensured that thanks to the wavy configuration of the pipe a comparatively large heat transfer surface is given, but that at the same time the disadvantages of the prior art disadvantages are overcome, in particular the unwanted isolation effects in trapped air bubbles and / or Forming attachments in the form of impurities. Thus, the construction of the invention provides improved reliability, and this without additional design effort.

The object underlying the invention is thus achieved by all three described aspects of the invention each on its own, wherein a combination of two or all three aspects is advantageous.

According to a further feature of the invention, the corrugated pipe is arranged meandering at least in sections within the fresh water tank, with the individual meanders each having meander limbs which are inclined to the horizontal. This embodiment has the advantage that, after flowing through the shaft pipeline with flushing liquid, remaining fluid remaining therefrom can flow away from gravity, resulting in complete emptying of the shaft pipeline ensures. In particular, in combination with the feature of undulating portions formed, the unwanted retention of residual liquid within the shaft pipe can be safely avoided.

The waves of the shaft pipeline may be rotationally symmetrical about a tube axis extending in the tube axis. As an alternative to this embodiment, according to the third aspect of the invention, it may be provided that the corrugated pipe has a wave contour that extends at least in sections helically about an axis in the pipe longitudinal direction. Accordingly, the waves in their wave contour are not rotationally symmetrical, but wave-shaped, that is, on a helix-type helix.

Fig. 1

in schematischer Darstellung eine Geschirrspülmaschine nach der Erfindung;

Fig. 2

in schematischer Draufsicht einen Frischwasserbehälter nach der Erfindung;

Fig. 3

in schematischer Perspektivansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß einer ersten Ausführungsform;

Fig. 4

in schematischer Perspektivansicht von oben ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der ersten Ausführungsform;

Fig. 5

in schematischer Seitenansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der ersten Ausführungsform;

Fig. 6

in schematischer Perspektivansicht von schräg vorne ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der ersten Ausführungsform;

Fig. 7

in schematischer Draufsicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der ersten Ausführungsform;

Fig. 8

in schematischer Seitenansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der ersten Ausführungsform;

Fig. 9

in schematischer Perspektivdarstellung ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß einer zweiten Ausführungsform;

Fig. 10

in einer Seitenansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der zweiten Ausführungsform;

Fig. 11

in schematischer Perspektivdarstellung ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der zweiten Ausführungsform;

Fig. 12

in schematischer Detailansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der zweiten Ausführungsform;

Fig. 13

in schematischer Seitenansicht eine Wellenrohrleitung nach der Erfindung gemäß einer dritten Ausführungsform;

Fig. 14

in schematischer Perspektivdarstellung ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform;

Fig. 15

in einer Seitenansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform;

Fig. 16

in schematischer Detailansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform;

Fig. 17

in schematischer Perspektivansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform;

Fig. 18

in schematischer Draufsicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform;

Fig. 19

in schematischer Perspektivansicht ausschnittsweise eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform und

Fig. 20

in einer Ansicht von vorn eine Wellenrohrleitung nach der Erfindung gemäß der dritten Ausführungsform.

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

Fig. 1

a schematic representation of a dishwasher according to the invention;

Fig. 2

in a schematic plan view of a fresh water tank according to the invention;

Fig. 3

a schematic perspective view of a detail of a shaft pipe according to the invention according to a first embodiment;

Fig. 4

in a schematic perspective view from above a detail of a shaft pipe according to the invention according to the first embodiment;

Fig. 5

a schematic side view of a detail of a corrugated pipe according to the invention according to the first embodiment;

Fig. 6

in a schematic perspective view obliquely from the front part of a wave pipe according to the invention according to the first embodiment;

Fig. 7

a schematic plan view of a section of a corrugated pipe according to the invention according to the first embodiment;

Fig. 8

in a schematic side view of a detail of a wave pipe after the Invention according to the first embodiment;

Fig. 9

a schematic perspective view of a detail of a corrugated pipe according to the invention according to a second embodiment;

Fig. 10

in a side view fragmentary a shaft pipe according to the invention according to the second embodiment;

Fig. 11

a schematic perspective view of a detail of a shaft pipe according to the invention according to the second embodiment;

Fig. 12

a schematic detail of a detail of a shaft pipe according to the invention according to the second embodiment;

Fig. 13

in a schematic side view of a shaft pipe according to the invention according to a third embodiment;

Fig. 14

a schematic perspective view of a detail of a corrugated pipe according to the invention according to the third embodiment;

Fig. 15

in a side view fragmentary a shaft pipe according to the invention according to the third embodiment;

Fig. 16

a schematic detail of a detail of a shaft pipe according to the invention according to the third embodiment;

Fig. 17

a schematic perspective view of a detail of a shaft pipe according to the invention according to the third embodiment;

Fig. 18

a schematic plan view of a detail of a corrugated pipe according to the invention according to the third embodiment;

Fig. 19

In a schematic perspective view of a detail of a shaft pipe according to the invention according to the third embodiment and

Fig. 20

in a front view of a shaft pipe according to the invention according to the third embodiment.

FIG. 1 can be seen in a purely schematic representation of a dishwasher 1 according to the invention. This has, in a manner known per se, a rinsing container 2 which provides a rinsing chamber 3. Within the Spülraums 3 spray arms 7 are arranged, which are fluidly connected via lines 8 to a circulating pump 5.

The flushing chamber 3 opens into a collecting pot 4, which is fluidically connected both to the circulating pump 5 and to a sewage pump 6.

The dishwasher 1 further has a known from the prior art per se water inlet pocket 9. This is connected to a water connection 10. The water inlet pocket 9 provides a conduit 12 which, starting from the water connection 10 with the interposition of an impeller 11 and a resin container 13, is connected to a valve 14. This valve 14 connects the line 12 selectively either with the opening into the collecting pot 4 line 15 or with the leading to a fresh water tank 17 line 16th

The fresh water tank 17 is juxtaposed to the washing compartment 2. He is the input side connected to the water inlet 10 leading line 16. On the output side, the fresh water tank 17 is connected by means of the line 18 to the collecting pot 4. The line 18 can be selectively opened or closed by means of a valve 19, which may be formed as a solenoid valve, for example.

The fresh water tank 17 has an overflow 20. This is connected to a line 21 which is guided through an opening 22 in the washing compartment 2 in the washing compartment 3.

Within the fresh water tank 17, a pipe 23 is laid. This is the input side connected to the line 24, which in turn leads to the circulating pump 5. On the output side, the pipe 23 is connected to a line 25 through the Opening 22 in the washing compartment 2 is guided in the washing compartment 3.

The lines 23, 24 and 25, together with the washing compartment 3 and the collecting pot 4, form a closed flow circuit in which washing liquor can be circulated by means of the circulating pump 5. In this case, the rinsing water gives off energy in the form of heat when flowing through the pipeline 23 to the fresh water present in the fresh water tank 17. In that regard, equipped with the pipe 23 fresh water tank 17 is a heat exchanger.

The above-described construction allows the following process performance.

Upon completion of a wash program, the fresh water tank 17 is filled with fresh water. This can warm up to room temperature and is ready for a subsequent washing program.

With the beginning of the subsequent wash program, the valve 19 is opened and the preheated to room temperature fresh water flows by gravity into the sump 4 of the dishwasher 1 a. If necessary, additional fresh water can be supplied to the collecting pot 4 via the water connection 10 by means of the lines 12 and 15. As soon as the total required amount of fresh water in the collecting pot 4 is available, the actual washing program starts with the first program step.

If, during the execution of a rinsing program step, heated rinsing liquor is used, a heat recovery by heat transfer from the rinsing liquor to fresh water stored in the fresh water container 17 takes place after completion of this rinsing program step. For this purpose, after completion of the Spülprogrammschritts the fresh water tank 17 is filled with closed valve 19 with fresh water. The water diverter of the circulation pump 5, which is not shown in the figures, is switched accordingly and then the warm rinsing liquor in the rinsing tank 2 is guided by means of the circulating pump 5 through the pipes 24, 23 and 25. The pipe 23 is routed within the fresh water tank 17, so that it comes in a flow of rinsing water to a heat transfer to the fresh water tank 17 located in the fresh water. After flowing through the pipes, the rinsing liquor returns to the washing container 2, where they are in Collection pot 4 again accumulates and is repeatedly guided by the circulation pump 5 through the pipes 24, 23 and 25. This circulation operation is maintained for a predefinable period of time or until the temperature of the rinse liquor drops to a predeterminable temperature.

Once the rinse liquor circulation is completed for the purpose of heat transfer, the rinsing liquor contained in the collecting pot 4 is discarded as waste water, for which purpose the wastewater pump 6 is turned on.

After the pumping out of the rinsing liquor which is no longer required, the next rinsing program step can begin, for which purpose the valve 19 is opened. The preheated fresh water located in the fresh water tank 17 flows via the line 18 into the collecting pot 4. If necessary, further fresh water can be supplied via the line 15 from the water connection 10.

FIG. 2 can be seen in a schematic side view of a fresh water tank 17 according to the invention. As can be seen from the illustration, the pipeline 23 is laid meander-shaped within the fresh water tank 17. Each meander 33 provides a first meandering leg 34 and a second meandering leg 35. In order to ensure a residue-free drainage of wash liquor from the pipe 23, the meandering legs 34 and 35 are each inclined to the horizontal. The angle of inclination is at least 2 ° in each case. Due to this configuration, depending on the meandering leg 34 or 35, a gradient is obtained, which ensures that rinsing fluid flowing out of the pipeline 23 can completely flow out of the pipeline 23, ie, without residue, following the weight force.

On the input side, the pipe 23 has a connecting piece 26, which is connected in the final assembled state in a flow-tight manner to the pipe 24. On the output side, the pipe 23 has an outlet 27, which opens in an already described manner through an opening 22 into the provided by the washing compartment 2 2 washing compartment.

To achieve a rapid heat transfer and a high efficiency, it is provided that the pipe 23 has a comparatively large surface, ie heat transfer surface available. It is for this reason provided, the Form pipe 23 as a shaft pipe 23.

The others FIGS. 3 to 20 let recognize different wave configurations, the FIGS. 3 to 8 a first embodiment, the FIGS. 9 to 12 a second embodiment and the FIGS. 13 to 20 relate to a third embodiment.

The first embodiment according to the FIGS. 3 to 8 shows a wave contour 36, according to which the waves of the shaft pipe 23 are rotationally symmetrical about a pipe axis extending in the tube 30 longitudinal axis. Wave peaks 28 and wave troughs 29 alternate with each other in the tube longitudinal direction 30.

The wave contour 36 according to the first embodiment is characterized in that the wave peaks 28 protrude out of the lateral surface of the pipeline 23 with the same rib shape. The tube shell surface located between two wave crests 28 then forms the wave trough 29 located between these two crests 28. This is particularly clear from the presentation after Fig. 5 ,

The second embodiment according to the FIGS. 9 to 12 is designed to be comparable to the first embodiment. A difference, however, is that the respective transition between a wave crest 28 and a wave trough 29 or a wave trough 29 and a wave crest 28 is beveled. This creates a geometrically smooth transition between adjacent wave crests 28 and troughs 29. Clearly, this geometric configuration results in particular from the illustration Fig. 12 ,

The third embodiment according to the FIGS. 13 to 20 shows a wave contour 36, according to which the waves of the shaft pipe 23 are not formed rotationally symmetrical about a tube axis extending in the tube 30 longitudinal axis. Instead, it is provided that the shaft pipeline 23 has a wave contour 36 that extends at least in sections helically about an axis in the tube longitudinal direction 30. Accordingly, the waves in their wave contour 36 are not rotationally symmetrical, but helical, ie on a helix-type helix. In particular, the detail view after Fig. 16 lets recognize this helical wave contour 36.

Although a wave contour 36 of the pipe 23 with respect to an enlarged Heat transfer surface is basically beneficial, there are also disadvantages. A disadvantage is that air bubbles located inside the pipeline 23 can settle on the inside of the convex wave peaks 28. As a result, an insulating pad is formed between the rinsing liquid passed through the shaft pipe 23 on the one hand and the surface of the pipe 23 in the region of the peaks 28 on the other hand. As a result of such bubble setting, the efficiency of heat transfer decreases as well as the rate at which heat transfer occurs so that the effect of improved heat transfer actually achieved with the wave tube design does not occur or only greatly diminishes.

To counter this problem, an air duct 31 is provided which serves the vent. As can be seen in particular from the presentation after the FIGS. 4 . 5 . 6 and 18 results, the wave pipe 23 provides a ventilation channel 31 which extends at least partially in the pipe longitudinal direction 30 and adjacent wave peaks 28 fluidly interconnected. Residual air in the pipeline 23 can therefore escape and be expelled via the air duct 31 when the rinsing water flows in. As a result, the formation of undesirably remaining in the pipe 23 air cushions can be avoided.

Since undesired air bubbles typically settle above the liquid level of a rinsing liquid passed through the pipe 23, the air duct 31 according to the invention is preferably arranged on a meandering upper wall of the at least partially substantially horizontally guided meandering legs 34 and 35, as can be seen from a synopsis in particular Figures 2 . 3 and 8th results.

Another disadvantage associated with the wave-shaped configuration of the pipe 23 is that contaminants entrained in the rinsing liquid can settle on the inside of the pipe 23 into the volume spaces provided by the wave crests 28. Due to this effect also creates an undesirable heat insulation cushion, which affects the actually desired heat transfer between the guided through the pipe 23 rinsing liquid and stored in the fresh water tank 17 fresh water.

To counteract this disadvantage, it is provided that the shaft pipe 23 is formed in the tube longitudinal direction 30 at least in sections over a portion 32 in the circumferential direction 37 wave-free, as in particular the representations of the FIGS. 6 and 7 and 17 show.

The shaft-free embodiment in the partial region 32 provides a substantially smooth inner surface of the pipeline 23, which helps prevent the undesired adhesion of contaminants, dirt and / or the like.

As can be seen in particular Fig. 7 or 20 results, in the circumferential direction 37 extending wave-free portion 32 structurally formed by the successively in the pipe longitudinal direction 30 consecutively arranged wave peaks 28 and troughs 29 terminate in this section 32, ie in the lateral surface of the pipe 32 without formation of wave crests 28 and troughs 29 pass over. As a result, results in the sub-region 32, a tube shell surface, which is executed both inside and outside substantially smooth.

The pipe 23 is, as this particular Fig. 2 can recognize, arranged meandering within the fresh water tank 17, wherein the individual meanders 33 have substantially horizontally extending meander legs 34 and 35. In these substantially horizontally extending shaft pipe sections, the air duct 31 is formed on the upper pipe wall in the installation position of the shaft pipe, whereas the undulating portion 32 is located at a lower pipe wall installation position of the shaft pipe 23. This is also apparent from the detailed presentation Fig. 8 , According to this constellation, the advantages achieved with the formation of an air duct 31 on the one hand and the advantages achieved with a wave-free section 32 on the other hand can be achieved jointly. Here, the arrangement of the air duct 31 is due to a mounting position in the upper pipe wall the fact that settle air bubbles above the liquid level, whereas pollution following the sinking down and therefore preferentially settle on the inside of the lower pipe wall in installation position.

The according to the third embodiment of the FIGS. 13 to 20 helically shaped wave contour 36 provides the additional advantage that flushing liquid introduced into the pipe 23 is caused to swirl, and Although in correspondence of the helical wave contour 36 in a vortex movement about an axis extending in the tube longitudinal direction 30 tube axis. As a result of this whirling movement, any adhesions, soiling and / or the like located on the inside of the shaft pipeline 23 in the wave crests are entrained and flushed out. The same applies to any bubbles settling in wave crests. These too are entrained as a result of a vortex movement and thus expelled. In this case, the helically shaped wave contour 36 preferably also has, in the manner already described above, an air duct 31 or a wave-free partial region 32 at the corresponding locations.

reference numeral

1

dishwasher

2

rinse tank

3

Wash cabinet

4

collecting pot

5

circulating pump

6

sewage pump

7

spray arm

8th

management

9

Water enema bag

10

mains water supply

11

impeller

12

management

13

resin tank

14

Valve

15

management

16

management

17

Fresh water tank

18

management

19

Valve, e.g. magnetic valve

20

overflow

21

management

22

opening

23

pipeline

24

management

25

management

26

Support

27

outlet

28

Wellenberg

29

trough

30

Tube longitudinal direction

31

Air duct

32

rib-free section

33

meander

34

meander

35

meander

36

wave contour

37

circumferentially

Claims (5)

Dishwasher, in particular domestic dishwasher, with a rinsing container (2) providing a rinsing chamber (3) for receiving items to be cleaned, with a fresh water container (17) sited alongside the rinsing container (2) and at least partially through the fresh water container (17) passed through pipe (23), which is designed as a shaft pipe and both the input side and the output side to the washing compartment (2) is fluidly connected,
characterized,
that the shaft pipe (23) in a longitudinal tube direction (30) at least partially extending and adjacent crests (28) provides fluidically interconnecting air duct (31), and / or
in that the shaft pipeline (23) is formed in the tube longitudinal direction (30) at least in sections over a partial region (32) in the circumferential direction (37) without waves,
and or
that the shaft pipe (23) about an axis in the longitudinal tube direction (30) at least partially helically extending wave contour (36). Dishwasher according to claim 1,
characterized in that
in the circumferential direction (37) undulating portion (32) and the air duct (31) are formed opposite to each other. Dishwasher according to one of the preceding claims,
characterized in that
the shaft pipeline (23) is arranged meandering at least in sections within the fresh water tank (17), the individual meanders (33) each having meander legs (34, 35), which are preferably inclined to the horizontal. Dishwasher according to claim 3,
characterized in that
a, in particular each meandering leg (34, 35) has an air duct (31) on its upper pipe wall in the installation position. Dishwasher according to claim 3 or 4,
characterized in that
a, in particular each meandering leg (34, 35) on its lower in the installed position pipe wall in the circumferential direction (37) wave-free portion (32).

Images